1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2022 Free Software Foundation, Inc.
3 See the end for copying conditions.
5 Please send GNU C library bug reports via <https://sourceware.org/bugzilla/>
6 using `glibc' in the "product" field.
12 * The getent tool now supports the --no-addrconfig option. The output of
13 getent with --no-addrconfig may contain addresses of families not
14 configured on the current host i.e. as-if you had not passed
15 AI_ADDRCONFIG to getaddrinfo calls.
17 Security related changes:
19 CVE-2022-39046: When the syslog function is passed a crafted input
20 string larger than 1024 bytes, it reads uninitialized memory from the
21 heap and prints it to the target log file, potentially revealing a
22 portion of the contents of the heap.
24 The following bugs are resolved with this release:
26 [12154] Do not fail DNS resolution for CNAMEs which are not host names
27 [20975] Deferred cancellation triggers in __check_pf and looses lock leading to deadlock
28 [24816] Fix tst-nss-files-hosts-long on single-stack hosts
29 [27576] gmon: improve mcount overflow handling
30 [28846] CMSG_NXTHDR may trigger -Wstrict-overflow warning
31 [29444] gmon: Fix allocated buffer overflow (bug 29444)
32 [29864] libc: __libc_start_main() should obtain program headers
33 address (_dl_phdr) from the auxv, not the ELF header.
34 [29305] Conserve NSS buffer space during DNS packet parsing
35 [29402] nscd: nscd: No such file or directory
36 [29415] nscd: Fix netlink cache invalidation if epoll is used
37 [28937] New DSO dependency sorter does not put new map first if in a cycle
38 [29446] _dlopen now ignores dl_caller argument in static mode
39 [29485] Linux: Terminate subprocess on late failure in tst-pidfd
40 [29490] alpha: New __brk_call implementation is broken
41 [29463] math/test-float128-y1 fails on x86_64
42 [29488] test-ibm128-llround fails on ppc64el when built with gcc-12 and -O2
44 [29528] elf: Call __libc_early_init for reused namespaces
45 [29537] libc: [2.34 regression]: Alignment issue on m68k when using
46 [29539] libc: LD_TRACE_LOADED_OBJECTS changed how vDSO library are
47 [29576] build: librtld.os: in function `_dl_start_profile':
48 (.text+0x9444): undefined reference to `strcpy'
49 [29583] Use 64-bit interfaces in gconv_parseconfdir
50 [29600] Do not completely clear reused namespace in dlmopen
51 [29607] nscd repeatably crashes calling __strlen_avx2 when hosts cache is
53 [29638] libc: stdlib: arc4random fallback is never used
54 [29657] libc: Incorrect struct stat for 64-bit time on linux/generic
56 [29730] broken y2038 support in fstatat on MIPS N64
57 [29771] Restore IPC_64 support in sysvipc *ctl functions
58 [29776] elf/tst-tlsopt-powerpc fails when compiled with -mcpu=power10
59 [29951] time: Set daylight to 1 for matching DST/offset change
60 [30053] time: strftime %s returns -1 after 2038 on 32 bits systems
61 [30101] gmon: fix memory corruption issues
62 [30151] gshadow: Matching sgetsgent, sgetsgent_r ERANGE handling
63 [30163] posix: Fix system blocks SIGCHLD erroneously
64 [30305] x86_64: Fix asm constraints in feraiseexcept
65 [30477] libc: [RISCV]: time64 does not work on riscv32
71 * Support for DT_RELR relative relocation format has been added to
72 glibc. This is a new ELF dynamic tag that improves the size of
73 relative relocations in shared object files and position independent
74 executables (PIE). DT_RELR generation requires linker support for
75 -z pack-relative-relocs option, which is supported for some targets
76 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
78 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
79 have been added. The pidfd functionality provides access to a process
80 while avoiding the issue of PID reuse on tranditional Unix systems.
82 * On Linux, the process_madvise function has been added. It has the
83 same functionality as madvise but alters the target process identified
86 * On Linux, the process_mrelease function has been added. It allows a
87 caller to release the memory of a dying process. The release of the
88 memory is carried out in the context of the caller, using the caller's
89 CPU affinity, and priority with CPU usage accounted to the caller.
91 * The “no-aaaa” DNS stub resolver option has been added. System
92 administrators can use it to suppress AAAA queries made by the stub
93 resolver, including AAAA lookups triggered by NSS-based interfaces
94 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
95 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
96 produce IPv6 addresses, and configured IPv6 name servers are still
97 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
98 are translated to A queries. The new resolver option is intended
99 primarily for diagnostic purposes, to rule out that AAAA DNS queries
100 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
101 validation by applications.
103 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
104 and mount_setattr have been added. They are part of the new Linux kernel
105 mount APIs that allow applications to more flexibly configure and operate
106 on filesystem mounts. The new mount APIs are specifically designed to work
109 * localedef now accepts locale definition files encoded in UTF-8.
110 Previously, input bytes not within the ASCII range resulted in
111 unpredictable output.
113 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
114 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
115 Support for the char8_t typedef has been added per the ISO C2X N2653
116 proposal. The functions are declared in uchar.h in C2X mode or when the
117 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
118 The char8_t typedef is declared in uchar.h in C2X mode or when the
119 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
120 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
122 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
123 added. The functions wrap getrandom and/or /dev/urandom to return high-
124 quality randomness from the kernel.
126 * Support for LoongArch running on Linux has been added. This port requires
127 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
130 - loongarch64-linux-gnu
132 The LoongArch ABI is 64-bit little-endian.
134 Deprecated and removed features, and other changes affecting compatibility:
136 * Support for prelink will be removed in the next release; this includes
137 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
138 variables and their functionality in the dynamic loader.
140 * The Linux kernel version check has been removed along with the
141 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
142 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
143 when libc.so is issued directly.
145 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
147 The following bugs are resolved with this release:
149 [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
150 return different result with versioned "foo"
151 [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
153 [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
154 ./exe and ld.so adjusts argv on the stack
155 [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
157 [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
158 consuming the second byte of certain double byte characters
159 [25812] stdio: Libio vtable protection is sometimes only partially
161 [27054] libc: pthread_atfork handlers that call pthread_atfork
163 [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
165 [28128] build: declare_symbol_alias doesn't work for assembly codes
166 [28566] network: getnameinfo with NI_NOFQDN is not thread safe
167 [28752] nss: Segfault in getpwuid when stat fails
168 [28815] libc: realpath should not copy to resolved buffer on error
169 [28828] stdio: fputwc crashes
170 [28838] libc: FAIL: elf/tst-p_align3
171 [28845] locale: ld-monetary.c should be updated to match ISO C and
173 [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
175 [28852] libc: getaddrinfo leaks memory with AI_ALL
176 [28853] libc: tst-spawn6 changes current foreground process group
177 (breaks test isolation)
178 [28857] libc: FAIL: elf/tst-audit24a
179 [28860] build: --enable-kernel=5.1.0 build fails because of missing
180 __convert_scm_timestamps
181 [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
182 inaccurate without /sys and /proc
183 [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
185 [28880] libc: Program crashes if date beyone 2038
186 [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
187 !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
188 [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
189 rtm variants when avoiding overflow
190 [28922] build: The .d dependency files aren't always generated
191 [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
193 [28936] build: nm: No such file
194 [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
195 [28953] nss: NSS lookup result can be incorrect if function lookup
197 [28970] math: benchtest: libmvec benchmark doesn't build with make
199 [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
200 /sys/devices/system/cpu/possible
201 [28993] libc: closefrom() iterates until max int if no access to
203 [28996] libc: realpath fails to copy partial result to resolved buffer
205 [29027] math: [ia64] fabs fails with sNAN input
206 [29029] nptl: poll() spuriously returns EINTR during thread
207 cancellation and with cancellation disabled
208 [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
209 uses of mbsrtowcs (*** buffer overflow detected ***: terminated)
210 [29062] dynamic-link: Memory leak in _dl_find_object_update if object
211 is promoted to global scope
212 [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
213 -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
214 [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
216 [29097] time: fchmodat does not handle 64 bit time_t for
218 [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
220 [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
221 [29162] string: [PATCH] string.h syntactic error:
222 include/bits/string_fortified.h:110: error: expected ',' or ';'
223 before '__fortified_attr_access'
224 [29165] libc: [Regression] broken argv adjustment
225 [29187] dynamic-link: [regression] broken argv adjustment for nios2
226 [29193] math: sincos produces a different output than sin/cos
227 [29197] string: __strncpy_power9() uses uninitialised register vs18
228 value for filling after \0
229 [29203] libc: daemon is not y2038 aware
230 [29204] libc: getusershell is not 2038 aware
231 [29207] libc: posix_fallocate fallback implementation is not y2038
233 [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
234 [29209] libc: isfdtype is not y2038 aware
235 [29210] network: ruserpass is not y2038 aware
236 [29211] libc: __open_catalog is not y2038 aware
237 [29213] libc: gconv_parseconfdir is not y2038 aware
238 [29214] nptl: pthread_setcanceltype fails to set type
239 [29225] network: Mistyped define statement in socket/sys/socket.h in
241 [29274] nptl: __read_chk is not a cancellation point
242 [29279] libc: undefined reference to `mbstowcs_chk' after
243 464d189b9622932a75302290625de84931656ec0
244 [29304] libc: mq_timedreceive does not handle 64 bit syscall return
245 correct for !__ASSUME_TIME64_SYSCALLS
246 [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
247 missing on microblaze with largefile
253 * Unicode 14.0.0 Support: Character encoding, character type info, and
254 transliteration tables are all updated to Unicode 14.0.0, using
255 generator scripts contributed by Mike FABIAN (Red Hat).
257 * Bump r_version in the debugger interface to 2 and add a new field,
258 r_next, support multiple namespaces.
260 * Support for the C.UTF-8 locale has been added to glibc. The locale
261 supports full code-point sorting for all valid Unicode code points. A
262 limitation in the framework for fnmatch, regexec, and regcomp requires
263 a compromise to save space and only ASCII-based range expressions are
264 supported for now (see bug 28255). The full size of the locale is
265 only ~400KiB, with 346KiB coming from LC_CTYPE information for
266 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
267 in various downstream distributions. The locale is not built into
268 glibc, and must be installed.
270 * <math.h> functions that round their results to a narrower type, and
271 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
272 18661-3:2015 and draft ISO C2X:
274 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
275 fMxsqrtfN and fMxsqrtfNx functions.
277 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
280 * <math.h> functions for floating-point maximum and minimum,
281 corresponding to new operations in IEEE 754-2019, and corresponding
282 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
283 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
284 fminimum_mag, fminimum_mag_num and corresponding functions for float,
285 long double, _FloatN and _FloatNx.
287 * <math.h> macros for single-precision float constants are added as a
288 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
289 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
292 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
293 predefined as specified in TS 18661-1:2014.
295 * The exp10 functions in <math.h> now have a corresponding type-generic
298 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
300 * printf-family functions now support the %b format for output of
301 integers in binary, as specified in draft ISO C2X, and the %B variant
302 of that format recommended by draft ISO C2X.
304 * A new DSO sorting algorithm has been added in the dynamic linker that uses
305 topological sorting by depth-first search (DFS), solving performance issues
306 of the existing sorting algorithm when encountering particular circular
307 object dependency cases.
309 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
310 the two DSO sorting algorithms. The default setting of '2' uses the
311 new DFS-based algorithm. The setting '1' switches to the old
312 algorithm used in glibc 2.33 and earlier.
314 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
315 to be used by compilers for optimizing usage of 'memcmp' when its
316 return value is only used for its boolean status.
318 * Support for automatically registering threads with the Linux rseq
319 system call has been added. This system call is implemented starting
320 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
321 operations on per-cpu data. It allows user-space to perform updates
322 on per-cpu data without requiring heavy-weight atomic operations.
323 Automatically registering threads allows all libraries, including
324 libc, to make immediate use of the rseq support by using the
325 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
326 variables. The GNU C Library manual has details on integration of
327 Restartable Sequences.
329 * A symbolic link to the dynamic linker is now installed under
330 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
332 * All programs and the testsuite in glibc are now built as position independent
333 executables (PIE) by default on toolchains and architectures that support it.
334 Further, if the toolchain and architecture supports it, even static programs
335 are built as PIE and the resultant glibc can be used to build static PIE
336 executables. A new option --disable-default-pie has been added to disable
337 this behavior and get a non-PIE build. This option replaces
338 --enable-static-pie, which no longer has any effect on the build
341 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
342 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
343 or to use huge pages directly with mmap calls with the MAP_HUGETLB
344 flags). The former can improve performance when Transparent Huge Pages
345 is set to 'madvise' mode while the latter uses the system reserved
348 * The printf family of functions now handles the flagged %#m conversion
349 specifier, printing errno as an error constant (similar to strerrorname_np).
351 * The function _dl_find_object has been added. In-process unwinders
352 can use it to efficiently locate unwinding information for a code
355 * Support for OpenRISC running on Linux has been added. This port requires
356 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
361 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
362 64-bit file offsets (LFS default).
364 * A new configure option, --with-rtld-early-cflags, can be used to
365 specify additional compiler flags for building the early startup code
366 of the dynamic linker. On targets which have CPU compatibility
367 checks, this can help to ensure that proper diagnostics are printed if
368 the dynamic loader runs on an incompatible CPU.
370 * On Linux, the epoll_pwait2 function has been added. It is similar to
371 epoll_wait with the difference the timeout has nanoseconds resolution.
373 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
374 enabling posix_spawn and posix_spawnp to set the controlling terminal in
375 the new process in a race free manner. This function is a GNU extension.
377 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
378 applications compiling with glibc and gcc 12 and later. Level 3 leverages
379 the __builtin_dynamic_object_size function to deliver additional
380 fortification balanced against additional runtime cost (checking non-constant
383 * The audit libraries will avoid unnecessary slowdown if it is not required
384 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
386 Deprecated and removed features, and other changes affecting compatibility:
388 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
389 has been removed since the first PT_LOAD segment is no longer executable
390 due to defaulting to -z separate-code.
392 * The r_version update in the debugger interface makes the glibc binary
393 incompatible with GDB binaries built without the following commits:
395 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
396 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
398 when audit modules or dlmopen are used.
400 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
402 * The --enable-static-pie option is no longer available. The glibc build
403 configuration script now automatically detects static-pie support in the
404 toolchain and architecture and enables it if available.
406 * The catchsegv script and associated libSegFault.so shared object have
407 been removed. There are widely-deployed out-of-process alternatives for
408 catching coredumps and backtraces.
410 * Support for prelink will be removed in the next release; this includes
411 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
412 variables and their functionality in the dynamic loader.
414 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
415 functionality to obtain the program mapping address can be achieved by
416 using LD_TRACE_LOADED_OBJECTS to value of 2.
418 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
419 support prelink PIE binaries.
421 Changes to build and runtime requirements:
423 * The audit module interface version LAV_CURRENT is increased to enable
424 proper bind-now support. The loader now advertises via the la_symbind
425 flags that PLT trace is not possible. New audit modules require the
426 new dynamic loader supporing the latest LAV_CURRENT version. Old audit
427 modules are still loaded for all targets except aarch64.
429 * The audit interface on aarch64 is extended to support both the indirect
430 result location register (x8) and NEON Q register. Old audit modules are
431 rejected by the loader. Audit modules must be rebuilt to use the newer
432 structure sizes and the latest module interface version for LAV_CURRENT.
434 Security related changes:
436 CVE-2022-23219: Passing an overlong file name to the clnt_create
437 legacy function could result in a stack-based buffer overflow when
438 using the "unix" protocol. Reported by Martin Sebor.
440 CVE-2022-23218: Passing an overlong file name to the svcunix_create
441 legacy function could result in a stack-based buffer overflow.
443 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
444 function could result in a memory leak and potential access of
445 uninitialized memory. Reported by Qualys.
447 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
448 function may result in an off-by-one buffer underflow and overflow
449 when the current working directory is longer than PATH_MAX and also
450 corresponds to the / directory through an unprivileged mount
451 namespace. Reported by Qualys.
453 The following bugs are resolved with this release:
455 [12889] nptl: Race condition in pthread_kill
456 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
457 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
458 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
460 [15333] libc: Use 64-bit stat functions in installed programs
461 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
463 [15971] dynamic-link: No interface for debugger access to libraries
465 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
466 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
467 deeply nested DSO dependencies.
468 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
469 ID whose lifetime has not ended
470 [22542] network: buffer overflow in sunrpc clnt_create
472 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
474 [25947] malloc: memory leak in muntrace
475 [26045] math: fmaxf(inf, nan) does not always work
476 [26108] math: exp10() has problems with <tgmath.h>
477 [26779] build: benign use after realloc at localealias.c:329
478 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
479 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
480 [27945] build: build-many-glibcs.py doesn't configure GCC with
481 --enable-initfini-array
482 [27991] build: x86: sysdeps/x86/configure.ac breaks when
483 libc_cv_include_x86_isa_level is loaded from cache
484 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
485 in __REDIRECT_NTH macro
486 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
487 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
489 [28126] libc: nftw aborts for paths longer than PATH_MAX
490 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
491 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
493 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
494 [28185] math: Inaccurate j0f function (again)
495 [28199] locale: iconvconfig prefix flag behaves differently in glibc
497 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
498 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
500 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
501 [28223] libc: mips: clone does not align stack
502 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
504 [28256] malloc: Conditional jump or move depends on uninitialised
505 value(s) in __GI___tunables_init
506 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
507 spawn5 fail if stray fds are open
508 [28310] libc: Do not use affinity mask for sysconf
509 (_SC_NPROCESSORS_CONF)
510 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
512 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
514 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
515 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
517 [28353] network: Race condition on __opensock
518 [28357] dynamic-link: deadlock between pthread_create and ctors
519 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
520 [28361] nptl: Fix for bug 12889 causes setxid deadlock
521 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
522 [28390] localedata: Update locale data to Unicode 14.0.0
523 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
525 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
527 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
528 to tgkill (getpid (), gettid())
529 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
530 [28457] dynamic-link: Missing reldepmod4.so dependency for
532 [28469] time: linux: struct timex is not correctly set for 32-bit
533 systems with TIMESIZE=64
534 [28470] regex: Buffer read overrun in regular expression searching
535 [28475] string: Incorrect access attribute on memfrob
536 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
537 spurious NUL character on state reset
538 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
540 [28550] dynamic-link: FAIL: tst-dso-
541 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
543 [28554] build: Undefined generate-md5
544 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
546 [28607] nptl: Masked signals are delivered on thread exit
547 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
548 lack of cpu counting /proc fallback with glibc 2.34
549 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
550 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
551 [28648] dynamic-link: Running ld.so on statically linked binaries
553 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
555 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
556 [28678] nptl: nptl/tst-create1 hangs sporadically
557 [28688] dynamic-link: PT_LOAD p_align check is too strict
558 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
560 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
561 timezones generated by tzcode-2021d and later
562 [28713] math: GCC 12 miscompiles libm
563 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
564 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
565 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
566 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
567 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
568 Assertion `GL(dl_rtld_map).l_libname' failed!
569 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
570 [28757] nptl: GDB printer tests failed with new GDB
571 [28765] math: x86_64 libmvec atan2 accuracy
572 [28766] manual: Document libmvec accuracy
573 [28768] network: Buffer overflow in svcunix_create with long pathnames
575 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
577 [28770] libc: Unexpected return value from realpath() for too long
578 results (CVE-2021-3998)
579 [28771] libc: %ebx optimization macros are incompatible with .altmacro
581 [28780] build: --disable-default-pie doesn't work on static programs
582 [28782] libc: x86-64 ISA level for glibc itself is always
584 [28792] glob: possible wrong behaviour with patterns with double [
586 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
587 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
588 empty mon_decimal_point_wc
595 * In order to support smoother in-place-upgrades and to simplify
596 the implementation of the runtime all functionality formerly
597 implemented in the libraries libpthread, libdl, libutil, libanl has
598 been integrated into libc. New applications do not need to link with
599 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
600 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
601 provided, so that the linker options keep working. Applications which
602 have been linked against glibc 2.33 or earlier continue to load the
603 corresponding shared objects (which are now empty). The integration
604 of those libraries into libc means that additional symbols become
605 available by default. This can cause applications that contain weak
606 references to take unexpected code paths that would only have been
607 used in previous glibc versions when e.g. preloading libpthread.so.0,
608 potentially exposing application bugs.
610 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
611 PTHREAD_STACK_MIN is no longer constant and is redefined to
612 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
613 sets for modern architectural features like Arm SVE.
615 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
616 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
617 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
618 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
619 dynamic sized register sets for modern architectural features like
622 * The dynamic linker implements the --list-diagnostics option, printing
623 a dump of information related to IFUNC resolver operation and
624 glibc-hwcaps subdirectory selection.
626 * On Linux, the function execveat has been added. It operates similar to
627 execve and it is is already used to implement fexecve without requiring
628 /proc to be mounted. However, different than fexecve, if the syscall is not
629 supported by the kernel an error is returned instead of trying a fallback.
631 * The ISO C2X function timespec_getres has been added.
633 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
634 C2X, is supported to enable declarations of functions defined in Annex F
635 of C2X. Those declarations are also enabled when
636 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
637 defined, and when _GNU_SOURCE is defined.
639 * On powerpc64*, glibc can now be compiled without scv support using the
640 --disable-scv configure option.
642 * Add support for 64-bit time_t on configurations like x86 where time_t
643 is traditionally 32-bit. Although time_t still defaults to 32-bit on
644 these configurations, this default may change in future versions.
645 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
646 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
647 only enabled for Linux and the full support requires a minimum kernel
650 * The main gconv-modules file in glibc now contains only a small set of
651 essential converter modules and the rest have been moved into a supplementary
652 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
653 in the same GCONV_PATH. Similarly, external converter modules directories
654 may have supplementary configuration files in a gconv-modules.d directory
655 with names ending with .conf to logically classify the converter modules in
658 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
659 to configure the size of the thread stack cache.
661 * The function _Fork has been added as an async-signal-safe fork replacement
662 since Austin Group issue 62 droped the async-signal-safe requirement for
663 fork (and it will be included in the future POSIX standard). The new _Fork
664 function does not run any atfork function neither resets any internal state
665 or lock (such as the malloc one), and only sets up a minimal state required
666 to call async-signal-safe functions (such as raise or execve). This function
667 is currently a GNU extension.
669 * On Linux, the close_range function has been added. It allows efficiently
670 closing a range of file descriptors on recent kernels (version 5.9).
672 * The function closefrom has been added. It closes all file descriptors
673 greater than or equal to a given integer. This function is a GNU extension,
674 although it is also present in other systems.
676 * The posix_spawn_file_actions_addclosefrom_np function has been added,
677 enabling posix_spawn and posix_spawnp to close all file descriptors greater
678 than or equal to a given integer. This function is a GNU extension,
679 although Solaris also provides a similar function.
681 * When invoked explicitly, the dynamic linker now uses the kernel to
682 execute programs that do not have any dynamic dependency (that is,
683 they are statically linked). This feature is Linux-specific.
685 Deprecated and removed features, and other changes affecting compatibility:
687 * The function pthread_mutex_consistent_np has been deprecated; programs
688 should use the equivalent standard function pthread_mutex_consistent
691 * The function pthread_mutexattr_getrobust_np has been deprecated;
692 programs should use the equivalent standard function
693 pthread_mutexattr_getrobust instead.
695 * The function pthread_mutexattr_setrobust_np has been deprecated;
696 programs should use the equivalent standard function
697 pthread_mutexattr_setrobust instead.
699 * The function pthread_yield has been deprecated; programs should use
700 the equivalent standard function sched_yield instead.
702 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
704 * Various rarely-used functions declared in <resolv.h> and
705 <arpa/nameser.h> have been deprecated. Applications are encouraged to
706 use dedicated DNS processing libraries if applicable. For <resolv.h>,
707 this affects the functions dn_count_labels, fp_nquery, fp_query,
708 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
709 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
710 p_type, putlong, putshort, res_hostalias, res_isourserver,
711 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
712 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
713 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
714 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
716 * Various symbols previously defined in libresolv have been moved to libc
717 in order to prepare for libresolv moving entirely into libc (see earlier
718 entry for merging libraries into libc). The symbols __dn_comp,
719 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
720 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
721 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
722 __res_search, __res_send formerly in libresolv have been renamed and no
723 longer have a __ prefix. They are now available in libc.
725 * The pthread cancellation handler is now installed with SA_RESTART and
726 pthread_cancel will always send the internal SIGCANCEL on a cancellation
727 request. It should not be visible to applications since the cancellation
728 handler should either act upon cancellation (if asynchronous cancellation
729 is enabled) or ignore the cancellation internal signal. However there are
730 buggy kernel interfaces (for instance some CIFS versions) that could still
731 see a spurious EINTR error when cancellation interrupts a blocking syscall.
733 * Previously, glibc installed its various shared objects under versioned
734 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
735 were provided as symbolic links. Starting with glibc 2.34, the shared
736 objects are installed under their ABI sonames directly, without
737 symbolic links. This increases compatibility with distribution
738 package managers that delete removed files late during the package
739 upgrade or downgrade process.
741 * The symbols mallwatch and tr_break are now deprecated and no longer used in
742 mtrace. Similar functionality can be achieved by using conditional
743 breakpoints within mtrace functions from within gdb.
745 * The __morecore and __after_morecore_hook malloc hooks and the default
746 implementation __default_morecore have been removed from the API. Existing
747 applications will continue to link against these symbols but the interfaces
748 no longer have any effect on malloc.
750 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
751 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
752 disabled by default in the main C library. Users looking to use these
753 features now need to preload a new debugging DSO libc_malloc_debug.so to get
754 this functionality back.
756 * The deprecated functions malloc_get_state and malloc_set_state have been
757 moved from the core C library into libc_malloc_debug.so. Legacy applications
758 that still use these functions will now need to preload libc_malloc_debug.so
759 in their environment using the LD_PRELOAD environment variable.
761 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
762 __memalign_hook and __free_hook are now removed from the API. Compatibility
763 symbols are present to support legacy programs but new applications can no
764 longer link to these symbols. These hooks no longer have any effect on glibc
765 functionality. The malloc debugging DSO libc_malloc_debug.so currently
766 supports hooks and can be preloaded to get this functionality back for older
767 programs. However this is a transitional measure and may be removed in a
768 future release of the GNU C Library. Users may port away from these hooks by
769 writing and preloading their own malloc interposition library.
771 Changes to build and runtime requirements:
773 * On Linux, the shm_open, sem_open, and related functions now expect the
774 file shared memory file system to be mounted at /dev/shm. These functions
775 no longer search among the system's mount points for a suitable
776 replacement if /dev/shm is not available.
778 Security related changes:
780 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
781 a request for netgroup lookup, may crash due to a double-free,
782 potentially resulting in degraded service or Denial of Service on the
783 local system. Reported by Chris Schanzle.
785 CVE-2021-33574: The mq_notify function has a potential use-after-free
786 issue when using a notification type of SIGEV_THREAD and a thread
787 attribute with a non-default affinity mask.
789 CVE-2021-35942: The wordexp function may overflow the positional
790 parameter number when processing the expansion resulting in a crash.
791 Reported by Philippe Antoine.
793 The following bugs are resolved with this release:
795 [4737] libc: fork is not async-signal-safe
796 [5781] math: Slow dbl-64 sin/cos/sincos for special values
797 [10353] libc: Methods for deleting all file descriptors greater than
798 given integer (closefrom)
799 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
800 name containing multi-byte character(s)
801 [14469] math: Inaccurate j0f function
802 [14470] math: Inaccurate j1f function
803 [14471] math: Inaccurate y0f function
804 [14472] math: Inaccurate y1f function
805 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
807 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
808 crashes if it fails dlsym() twice
809 [15648] nptl: multiple definition of `__lll_lock_wait_private'
810 [16063] nptl: Provide a pthread_once variant in libc directly
811 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
812 [17145] libc: syslog with LOG_CONS leaks console file descriptor
813 [17183] manual: description of ENTRY struct in <search.h> in glibc
815 [18435] nptl: pthread_once hangs when init routine throws an exception
816 [18524] nptl: Missing calloc error checking in
817 __cxa_thread_atexit_impl
818 [19329] dynamic-link: dl-tls.c assert failure at concurrent
819 pthread_create and dlopen
820 [19366] nptl: returning from a thread should disable cancellation
821 [19511] nptl: 8MB memory leak in pthread_create in case of failure
822 when non-root user changes priority
823 [20802] dynamic-link: getauxval NULL pointer dereference after static
825 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
826 [22057] malloc: malloc_usable_size is broken with mcheck
827 [22668] locale: LC_COLLATE: the last character of ellipsis is not
829 [23323] libc: [RFE] CSU startup hardening.
830 [23328] malloc: Remove malloc hooks and ensure related APIs return no
832 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
833 $PLATFORM, $ORIGIN) crashes
834 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
835 [23554] nptl: pthread_getattr_np reports wrong stack size with
837 [24106] libc: Bash interpreter in ldd script is taken from host
838 [24773] dynamic-link: dlerror in an secondary namespace does not use
839 the right free implementation
840 [25036] localedata: Update collation order for Swedish
841 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
842 shm_open to pick wrong directory
843 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
844 crash in IFUNC resolver due to stack canary (--enable-stack-
846 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
847 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
848 [27111] dynamic-link: pthread_create and tls access use link_map
849 objects that may be concurrently freed by dlclose
850 [27132] malloc: memusagestat is linked to system librt, leading to
851 undefined symbols on major version upgrade
852 [27136] dynamic-link: dtv setup at thread creation may leave an entry
854 [27249] libc: libSegFault.so does not output signal number properly
855 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
857 [27318] dynamic-link: glibc fails to load binaries when built with
858 -march=sandybridge: CPU ISA level is lower than required
859 [27343] nss: initgroups() SIGSEGVs when called on a system without
860 nsswich.conf (in a chroot)
861 [27346] dynamic-link: x86: PTWRITE feature check is missing
862 [27389] network: NSS chroot hardening causes regressions in chroot
864 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
865 [27444] libc: sysconf reports unsupported option (-1) for
866 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
867 [27462] nscd: double-free in nscd (CVE-2021-27645)
868 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
869 malloc/tst-malloc-thread-fail
870 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
871 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
873 [27522] glob: glob, glob64 incorrectly marked as __THROW
874 [27555] dynamic-link: Static tests fail with --enable-stack-
876 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
877 information for the current directory
878 [27577] dynamic-link: elf/ld.so --help doesn't work
879 [27605] libc: tunables can't control xsave/xsavec selection in
881 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
882 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
884 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
885 _nss_files_getcanonname_r) from within a dlmopen namespace.
886 [27648] libc: FAIL: misc/tst-select
887 [27650] stdio: vfscanf returns too early if a match is longer than
889 [27651] libc: Performance regression after updating to 2.33
890 [27655] string: Wrong size calculation in string/test-strnlen.c
891 [27706] libc: select fails to update timeout on error
892 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
893 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
894 tries resolving them lazily
895 [27744] nptl: Support different libpthread/ld.so load orders in
897 [27749] libc: Data race __run_exit_handlers
898 [27761] libc: getconf: Segmentation fault when passing '-vq' as
900 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
901 exceeds maximum object size 2147483647
902 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
904 [27872] build: Obsolete configure option --enable-stackguard-
906 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
907 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
908 [27892] libc: powerpc: scv ABI error handling fails to check
910 [27896] nptl: mq_notify does not handle separately allocated thread
911 attributes (CVE-2021-33574)
912 [27901] libc: TEST_STACK_ALIGN doesn't work
913 [27902] libc: The x86-64 clone wrapper fails to align child stack
914 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
915 [27939] libc: aarch64: clone does not align the stack
916 [27968] libc: s390x: clone does not align the stack
917 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
918 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
920 [28028] malloc: malloc: tcache shutdown sequence does not work if the
921 thread never allocated anything
922 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
923 [28064] string: x86_64:wcslen implementation list has wcsnlen
924 [28067] libc: FAIL: posix/tst-spawn5
925 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
926 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
928 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
929 [28089] build: tst-tls20 fails when linker defaults to --as-needed
930 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
932 [28091] network: ns_name_skip may return 0 for domain names without
940 * The dynamic linker accepts the --list-tunables argument which prints
941 all the supported tunables. This option is disable if glibc is
942 configured with tunables disabled (--enable-tunables=no).
944 * The dynamic linker accepts the --argv0 argument and provides opportunity
945 to change argv[0] string.
947 * The dynamic linker loads optimized implementations of shared objects
948 from subdirectories under the glibc-hwcaps directory on the library
949 search path if the system's capabilities meet the requirements for
950 that subdirectory. Initially supported subdirectories include
951 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
952 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
953 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
954 subdirectory names correspond to the vendor-independent x86-64
955 microarchitecture levels defined in the x86-64 psABI supplement.
957 * The new --help option of the dynamic linker provides usage and
958 information and library search path diagnostics.
960 * The mallinfo2 function is added to report statistics as per mallinfo,
961 but with larger field widths to accurately report values that are
962 larger than fit in an integer.
964 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
966 * Support for the RISC-V ISA running on Linux has been expanded to run on
967 32-bit hardware. This is supported for the following ISA and ABI pairs:
973 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
976 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
977 glibc may use additional checks that may have an additional performance
978 overhead. At present these checks are available only on LLVM 9 and later.
979 The latest GCC available at this time (10.2) does not support this level of
982 Deprecated and removed features, and other changes affecting compatibility:
984 * The mallinfo function is marked deprecated. Callers should call
987 * When dlopen is used in statically linked programs, alternative library
988 implementations from HWCAP subdirectories are no longer loaded.
989 Instead, the default implementation is used.
991 * The deprecated <sys/vtimes.h> header and the function vtimes have been
992 removed. To support old binaries, the vtimes function continues to exist
993 as a compatibility symbol. Applications should use the getrlimit or
996 * Following a change in the tzdata 2018a release upstream, the zdump
997 program is now installed in the /usr/bin subdirectory. Previously,
998 the /usr/sbin subdirectory was used.
1000 * On s390(x), the type float_t is now derived from the macro
1001 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
1002 hardcoded to double. This does not affect the ABI of any libraries
1003 that are part of the GNU C Library, but may affect the ABI of other
1004 libraries that use this type in their interfaces. The new definition
1005 improves consistency with compiler behavior in many scenarios.
1007 * A future version of glibc will stop loading shared objects from the
1008 "tls" subdirectories on the library search path, the subdirectory that
1009 corresponds to the AT_PLATFORM system name, and also stop employing
1010 the legacy AT_HWCAP search mechanism. Applications should switch to
1011 the new glibc-hwcaps mechanism instead; if they do not do that, only
1012 the baseline version (directly from the search path directory) will be
1015 Changes to build and runtime requirements:
1017 * On Linux, the system administrator needs to configure /dev/pts with
1018 the intended access modes for pseudo-terminals. glibc no longer
1019 attemps to adjust permissions of terminal devices. The previous glibc
1020 defaults ("tty" group, user read/write and group write) already
1021 corresponded to what most systems used, so that grantpt did not
1022 perform any adjustments.
1024 * On Linux, the posix_openpt and getpt functions no longer attempt to
1025 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
1026 (and pseudo-terminals are supported), a devpts file system is mounted
1027 on /dev/pts. Current systems already meet these requirements.
1029 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
1031 Security related changes:
1033 CVE-2021-3326: An assertion failure during conversion from the
1034 ISO-20220-JP-3 character set using the iconv function has been fixed.
1035 This assertion was triggered by certain valid inputs in which the
1036 converted output contains a combined sequence of two wide characters
1037 crossing a buffer boundary. Reported by Tavis Ormandy.
1039 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
1040 invoked with input containing redundant shift sequences in the IBM1364,
1041 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
1043 CVE-2020-29562: An assertion failure has been fixed in the iconv function
1044 when invoked with UCS4 input containing an invalid character.
1046 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
1047 invoked with EUC-KR input containing invalid multibyte input sequences.
1049 The following bugs are resolved with this release:
1051 [10635] libc: realpath portability patches
1052 [16124] dynamic-link: ld.so should allow to change argv[0]
1053 [17924] malloc: 'free' should not set errno
1054 [18683] libc: Linux faccessat implementation can incorrectly ignore
1056 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
1057 [23091] hurd: missing waitid support
1058 [23249] libc: Epyc and other current AMD CPUs do not select the
1059 "haswell" platform subdirectory
1060 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
1062 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
1064 [24941] libc: Make grantpt usable after multi-threaded fork in more
1066 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
1067 [24973] locale: iconv encounters segmentation fault when converting
1068 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
1069 [25399] string: undefined reference to `__warn_memset_zero_len' when
1070 changing gnuc version
1071 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
1073 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
1075 [25971] libc: s390 bits/hwcap.h out of sync with kernel
1076 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
1077 [26100] libc: Race in syslog(3) with regards to tag printing.
1078 [26124] libc: Export <cpu-features.h>
1079 [26130] nscd: Inconsistent nscd cache during pruning
1080 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
1081 [26224] locale: iconv hangs when converting some invalid inputs from
1082 several IBM character sets (CVE-2020-27618)
1083 [26341] libc: realpath cyclically call __alloca(path_max) to consume
1084 too much stack space
1085 [26343] manual: invalid documented return type for strerrorname_np(),
1086 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
1087 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
1089 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
1091 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
1092 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
1094 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
1095 [26553] libc: mtx_init allows type set to "mtx_recursive" only
1096 [26555] string: strerrorname_np does not return the documented value
1097 [26592] libc: pointer arithmetic overflows in realpath
1098 [26600] network: Transaction ID collisions cause slow DNS lookups in
1100 [26606] libc: [2.33 Regression] pselect is broken on x32
1101 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
1102 [26620] glob: fnmatch with collating symbols results in segmentation
1104 [26625] libc: [2.33 Regression] CET is disabled
1105 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
1106 at the end of a memory mapping
1107 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
1108 by the caller to the kernel
1109 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
1110 [26647] build: [-Werror=array-parameter=] due to different
1111 declarations for __sigsetjmp
1112 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
1114 [26649] stdio: printf should handle non-normal x86 long double numbers
1115 gracefully (CVE-2020-29573)
1116 [26686] build: -Warray-parameter instances building with GCC 11
1117 [26687] build: -Warray-bounds instances building with GCC 11
1118 [26690] stdio: Aliasing violation in __vfscanf_internal
1119 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
1120 [26726] build: GCC warning calling new_composite_name with an array of
1122 [26736] libc: FAIL: misc/tst-sysvshm-linux
1123 [26737] libc: Random FAIL: rt/tst-shm
1124 [26791] libc: Missing O_CLOEXEC in sysconf.c
1125 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
1127 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
1129 [26818] string: aarch64: string tests may run ifunc variants that are
1131 [26821] libc: Memory leak test failures on Fedora 33
1132 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
1133 FSGSBASE/LM/RDRAND check failure
1134 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
1136 [26853] libc: aarch64: Missing unwind information in statically linked
1138 [26923] locale: Assertion failure in iconv when converting invalid
1139 UCS4 (CVE-2020-29562)
1140 [26926] dynamic-link: aarch64: library dependencies are not bti
1142 [26932] libc: sh: Multiple floating point functions defined as stubs
1144 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
1146 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1148 [27002] build: libc_freeres_fn build failure with GCC 11
1149 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1150 [27008] dynamic-link: ld.so.cache should have endianness markup
1151 [27042] libc: [alpha] anonymous union in struct stat confuses
1153 [27053] libc: Conformance regression in system(3) (and probably also
1155 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1157 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1158 [27083] libc: Unsafe unbounded alloca in addmntent
1159 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1161 [27130] string: "rep movsb" performance issue
1162 [27150] libc: alpha: wait4() is unavailable in static linking
1163 [27177] dynamic-link:
1164 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1166 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1167 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1168 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1169 related to combining characters (CVE-2021-3326)
1176 * Unicode 13.0.0 Support: Character encoding, character type info, and
1177 transliteration tables are all updated to Unicode 13.0.0, using
1178 generator scripts contributed by Mike FABIAN (Red Hat).
1180 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1182 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1183 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1184 Three ABIs are supported:
1190 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1191 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1193 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1194 DT_DEPAUDIT dynamic section entries of the main executable.
1196 * powerpc64le supports IEEE128 long double libm/libc redirects when
1197 using -mabi=ieeelongdouble to compile C code on supported GCC
1198 toolchains. It is recommended to use GCC 8 or newer when testing
1201 * To help detect buffer overflows and other out-of-bounds accesses
1202 several APIs have been annotated with GCC 'access' attribute. This
1203 should help GCC 10 issue better warnings.
1205 * On Linux, functions pthread_attr_setsigmask_np and
1206 pthread_attr_getsigmask_np have been added. They allow applications
1207 to specify the signal mask of a thread created with pthread_create.
1209 * The GNU C Library now provides the header file <sys/single_threaded.h>
1210 which declares the variable __libc_single_threaded. Applications are
1211 encouraged to use this variable for single-thread optimizations,
1212 instead of weak references to symbols historically defined in
1215 * The functions sigabbrev_np and sigdescr_np have been added. The
1216 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1217 SIGHUP) while sigdescr_np returns a string describing the signal number
1218 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1219 attempt to translate the return description, both functions return
1220 NULL for an invalid signal number.
1222 They should be used instead of sys_siglist or sys_sigabbrev and they
1223 are both thread and async-signal safe. These functions are GNU extensions.
1225 * The functions strerrorname_np and strerrordesc_np have been added. The
1226 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1227 while strerrordesc_np returns a string describing the error number
1228 (e.g "Invalid argument" for EINVAL). Different than strerror,
1229 strerrordesc_np does not attempt to translate the return description, both
1230 functions return NULL for an invalid error number.
1232 They should be used instead of sys_errlist and sys_nerr, both are
1233 thread and async-signal safe. These functions are GNU extensions.
1235 * AArch64 now supports standard branch protection security hardening
1236 in glibc when it is built with a GCC that is configured with
1237 --enable-standard-branch-protection (or if -mbranch-protection=standard
1238 flag is passed when building both GCC target libraries and glibc,
1239 in either case a custom GCC is needed). This includes branch target
1240 identification (BTI) and pointer authentication for return addresses
1241 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1242 extensions respectively for the protection to be effective,
1243 otherwise the used instructions are nops. User code can use PAC-RET
1244 without libc support, but BTI requires a libc that is built with BTI
1245 support, otherwise runtime objects linked into user code will not be
1248 Deprecated and removed features, and other changes affecting compatibility:
1250 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1251 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1252 RPC header files. Backward compatibility for old programs is kept
1253 only for architectures and ABIs that have been added in or before
1254 glibc 2.31. New programs need to use TI-RPC
1255 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1256 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1258 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1259 as shared library for backward compatibility and the NSS modules "nis"
1260 and "nisplus" are not built at all and libnsl's headers aren't
1261 installed. This compatibility is kept only for architectures and ABIs
1262 that have been added in or before version 2.28. Replacement
1263 implementations based on TI-RPC, which additionally support IPv6, are
1264 available from <https://github.com/thkukuk/>. This change does not
1265 affect the "compat" NSS module, which does not depend on libnsl
1266 since 2.27 and thus can be used without NIS.
1268 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1269 removed. To support old binaries, the sysctl function continues to
1270 exist as a compatibility symbol (on those architectures which had it),
1271 but always fails with ENOSYS. This reflects the removal of the system
1272 call from all architectures, starting with Linux 5.5.
1274 * The sstk function is no longer available to newly linked binaries.
1275 Its implementation always returned with a failure, and the function
1276 was not declared in any header file.
1278 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1279 sigrelse, sigignore and sigset, and the sigmask macro have been
1280 deprecated. Applications should use the sigsuspend, sigprocmask and
1281 sigaction functions instead.
1283 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1284 already supported this format for almost 20 years.
1286 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1287 are no longer available to newly linked binaries, and their declarations
1288 have been removed from <string.h>. They are exported solely as
1289 compatibility symbols to support old binaries. All programs should use
1292 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1293 are no longer available to newly linked binaries, and their declarations
1294 have been removed from <stdio.h>. They are exported solely as
1295 compatibility symbols to support old binaries. All programs should use
1296 strerror or strerror_r instead.
1298 * Both strerror and strerror_l now share the same internal buffer in the
1299 calling thread, meaning that the returned string pointer may be invalided
1300 or contents might be overwritten on subsequent calls in the same thread or
1301 if the thread is terminated. It makes strerror MT-safe.
1303 * Using weak references to libpthread functions such as pthread_create
1304 or pthread_key_create to detect the singled-threaded nature of a
1305 program is an obsolescent feature. Future versions of glibc will
1306 define pthread_create within libc.so.6 itself, so such checks will
1307 always flag the program as multi-threaded. Applications should check
1308 the __libc_single_threaded variable declared in
1309 <sys/single_threaded.h> instead.
1311 * The "files" NSS module no longer supports the "key" database (used for
1312 secure RPC). The contents of the /etc/publickey file will be ignored,
1313 regardless of the settings in /etc/nsswitch.conf. (This method of
1314 storing RPC keys only supported the obsolete and insecure AUTH_DES
1315 flavor of secure RPC.)
1317 * The __morecore and __after_morecore_hook malloc hooks and the default
1318 implementation __default_morecore have been deprecated. Applications
1319 should use malloc interposition to change malloc behavior, and mmap to
1320 allocate anonymous memory. A future version of glibc may require that
1321 applications which use the malloc hooks must preload a special shared
1322 object, to enable the hooks.
1324 * The hesiod NSS module has been deprecated and will be removed in a
1325 future version of glibc. System administrators are encouraged to
1326 switch to other approaches for networked account databases, such as
1329 Changes to build and runtime requirements:
1331 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1332 long double redirects.
1334 Security related changes:
1336 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1337 invoked with the -c option and when processing invalid multi-byte input
1338 sequences. Reported by Jan Engelhardt.
1340 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1341 corruption when they were passed a pseudo-zero argument. Reported by Guido
1342 Vranken / ForAllSecure Mayhem.
1344 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1345 expanding ~user has been fixed.
1347 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1348 memmove functions has been fixed. Discovered by Jason Royes and Samual
1349 Dytrych of the Cisco Security Assessment and Penetration Team (See
1352 The following bugs are resolved with this release:
1354 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1355 [10441] manual: Backtraces code example lacks error checking
1356 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1357 timer_sigev_thread dangerous
1358 [14231] stdio: stdio-common tests memory requirements
1359 [14578] libc: /proc-based emulation for lchmod, fchmodat
1360 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1361 filtee has constructor
1362 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1363 sequences (CVE-2016-10228)
1364 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1365 character entities for infinity & pi
1366 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1367 segfaults in applications
1368 [20543] libc: Please move from .gnu.linkonce to comdat
1369 [22489] network: gcc warns about implicit convertion in
1370 ICMP6_FILTER_SETPASS with -Wsign-conversion
1371 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1372 [23294] math: Complex _FloatN functions are redirected to the wrong
1373 function with -mlong-double-64
1374 [23296] libc: Data race in setting function descriptor during lazy
1376 [23668] dynamic-link: ldconfig: Default to the new format for
1378 [23819] hurd: hurd: Add C11 thread support
1379 [23990] build: test-container error out on failure to exec child.
1380 [23991] build: shell-container typo in run_command_array
1381 [24638] manual: Error in example of parsing a template string
1382 [24654] manual: Wrong declaration of wcschr in libc manual
1383 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1385 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1386 dynamically loaded dsos
1387 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1388 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1390 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1391 restore EAX, ECX and EDX
1392 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1393 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1394 [25420] network: Race condition in resolv_conf.c can result in caching
1395 stale configuration forever
1396 [25487] math: sinl() stack corruption from crafted input
1398 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1400 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1401 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1403 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1404 on 32 bit and old kernel
1405 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1406 [25639] localedata: Some names of days and months wrongly spelt in
1408 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1409 amount of sigset_t bytes
1410 [25691] stdio: printf: memory leak when printing long multibyte
1412 [25715] libc: system() returns wrong errors when posix_spawn fails
1413 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1414 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1415 state for conversions that produce two Unicode code points
1416 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1417 for linux x86_64 leads to livelock
1418 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1419 test failures, invalid instruction in ld.so
1420 [25790] glob: Typo in tst-fnmatch.input
1421 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1423 [25819] localedata: Update locale data to Unicode 13.0.0
1424 [25824] libc: Abnormal function of strnlen in aarch64
1425 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1426 [25896] libc: Incorrect prctl
1427 [25902] libc: Bad LOADARGS_N
1428 [25905] dynamic-link: VSX registers are corrupted during PLT
1429 resolution when glibc is built with --disable-multi-arch and --with-
1431 [25933] string: Off by one error in __strncmp_avx2 when
1432 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1434 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1435 exiting detached thread
1436 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1438 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1440 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1441 [26073] math: getpayload() has wrong return value
1442 [26076] dynamic-link: dlmopen crashes after failing to load
1443 dependencies in audit mode
1444 [26120] localedata: column width of of some Korean
1445 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1446 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1447 [26133] libc: Incorrect need_arch_feature_F16C
1448 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1450 [26149] libc: PKU is usable only if OSPKE is set
1451 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1453 [26208] libc: Incorrect bit_cpu_CLFSH
1454 [26210] network: Incorrect use of hidden symbols for global sunrpc
1456 [26211] stdio: printf integer overflow calculating allocation size
1457 [26214] stdio: printf_fp double free
1458 [26215] stdio: printf_fp memory leak
1459 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1460 [26258] nss: nss_compat should not read input files with mmap
1461 [26332] string: Incorrect cache line size load causes memory
1462 corruption in memset
1469 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1470 enable features from the draft ISO C2X standard. Only some features from
1471 this draft standard are supported by the GNU C Library, and as the draft
1472 is under active development, the set of features enabled by this macro is
1473 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1474 by compiling with "gcc -std=gnu2x".
1476 * The <math.h> functions that round their results to a narrower type now
1477 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1478 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1479 Clarification Request 13 to TS 18661-3.
1481 * The function pthread_clockjoin_np has been added, enabling join with a
1482 terminated thread with a specific clock. It allows waiting against
1483 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1485 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1487 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1488 in queries if the trust-ad option is set via the options directive in
1489 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1490 mode, the AD bit, as provided by the name server, is available to
1491 applications which call res_search and related functions. In the default
1492 mode, the AD bit is not set in queries, and it is automatically cleared in
1493 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1494 servers and the network path to them are treated as untrusted.)
1496 Deprecated and removed features, and other changes affecting compatibility:
1498 * The totalorder and totalordermag functions, and the corresponding
1499 functions for other floating-point types, now take pointer arguments to
1500 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1501 passing. This is in accordance with the resolution of Clarification
1502 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1503 floating-point arguments directly will continue to work.
1505 * The obsolete function stime is no longer available to newly linked
1506 binaries, and its declaration has been removed from <time.h>.
1507 Programs that set the system time should use clock_settime instead.
1509 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1510 in a future version of glibc. In this release, the header still exists
1511 but calling ftime will cause a compiler warning. All programs should use
1512 gettimeofday or clock_gettime instead.
1514 * The gettimeofday function no longer reports information about a
1515 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1516 many years, as it cannot handle the full complexity of the world's
1517 timezones, but hitherto we have supported it on a best-effort basis.
1518 Changes required to support 64-bit time_t on 32-bit architectures have
1519 made this no longer practical.
1521 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1522 should expect to receive a 'struct timezone' whose tz_minuteswest and
1523 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1524 happen on a few Linux-based ports. This will be corrected in a future
1527 All callers should supply a null pointer for the 'tzp' argument to
1528 gettimeofday. For accurate information about the time zone associated
1529 with the current time, use the localtime function.
1531 gettimeofday itself is obsolescent according to POSIX. We have no plans
1532 to remove access to this function, but portable programs should consider
1533 using clock_gettime instead.
1535 * The settimeofday function can still be used to set a system-wide time
1536 zone when the operating system supports it. This is because the Linux
1537 kernel reused the API, on some architectures, to describe a system-wide
1538 time-zone-like offset between the software clock maintained by the kernel,
1539 and the "RTC" clock that keeps time when the system is shut down.
1541 However, to reduce the odds of this offset being set by accident,
1542 settimeofday can no longer be used to set the time and the offset
1543 simultaneously. If both of its two arguments are non-null, the call
1544 will fail (setting errno to EINVAL).
1546 Callers attempting to set this offset should also be prepared for the call
1547 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1548 some Linux architectures. The Linux kernel maintainers are discussing a
1549 more principled replacement for the reused API. After a replacement
1550 becomes available, we will change settimeofday to fail with ENOSYS on all
1551 platforms when its 'tzp' argument is not a null pointer.
1553 settimeofday itself is obsolescent according to POSIX. Programs that set
1554 the system time should use clock_settime and/or the adjtime family of
1555 functions instead. We may cease to make settimeofday available to newly
1556 linked binaries after there is a replacement for Linux's time-zone-like
1559 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1560 the optional CAS instruction is implemented (for instance, LEON processors
1561 are still supported, but SuperSPARC processors are not).
1563 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1566 * If a lazy binding failure happens during dlopen, during the execution of
1567 an ELF constructor, the process is now terminated. Previously, the
1568 dynamic loader would return NULL from dlopen, with the lazy binding error
1569 captured in a dlerror message. In general, this is unsafe because
1570 resetting the stack in an arbitrary function call is not possible.
1572 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1573 executable stack unless explicitly configured at build time to require
1574 minimum kernel version 4.8 or newer. This is because executing
1575 floating-point branches on a non-executable stack on Linux kernels prior to
1576 4.8 can lead to application crashes for some MIPS configurations. While
1577 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1578 expected to enable non-executable stack by default with PT_GNU_STACK by
1579 default and is thus likely to trigger a crash on older kernels.
1581 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1582 non-executable stack while dropping support for older kernels.
1584 * System call wrappers for time system calls now use the new time64 system
1585 calls when available. On 32-bit targets, these wrappers attempt to call
1586 the new system calls first and fall back to the older 32-bit time system
1587 calls if they are not present. This may cause issues in environments
1588 that cannot handle unsupported system calls gracefully by returning
1589 -ENOSYS. Seccomp sandboxes are affected by this issue.
1591 Changes to build and runtime requirements:
1593 * It is no longer necessary to have recent Linux kernel headers to build
1594 working (non-stub) system call wrappers on all architectures except 64-bit
1595 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1597 * The ChangeLog file is no longer present in the toplevel directory of the
1598 source tree. ChangeLog files are located in the ChangeLog.old directory as
1599 ChangeLog.N where the highest N has the latest entries.
1601 Security related changes:
1603 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1604 out-of-bounds write when executed in a signal frame context.
1606 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1607 environment variable during program execution after a security
1608 transition, allowing local attackers to restrict the possible mapping
1609 addresses for loaded libraries and thus bypass ASLR for a setuid
1610 program. Reported by Marcin Kościelnicki.
1612 The following bugs are resolved with this release:
1614 [12031] localedata: iconv -t ascii//translit with Greek characters
1615 [15813] libc: Multiple issues in __gen_tempname
1616 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1617 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1618 [19767] libc: vdso is not used with static linking
1619 [19903] hurd: Shared mappings not being inherited by children processes
1620 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1621 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1623 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1624 Symbols-A/B Unicode blocks
1625 [23518] libc: Eliminate __libc_utmp_jump_table
1626 [24026] malloc: malloc_info() returns wrong numbers
1627 [24054] localedata: Many locales are missing date_fmt
1628 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1629 [24304] dynamic-link: Lazy binding failure during ELF
1630 constructors/destructors is not fatal
1631 [24376] libc: RISC-V symbol size confusion with _start
1632 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1634 [24824] libc: test-in-container does not install charmap files compatible
1636 [24844] regex: regex bad pointer / leakage if malloc fails
1637 [24867] malloc: Unintended malloc_info formatting changes
1638 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1639 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1640 [24882] libc: login: pututline uses potentially outdated cache
1641 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1642 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1644 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1646 [24930] dynamic-link: dlopen of PIE executable can result in
1647 _dl_allocate_tls_init assertion failure
1648 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1649 (stringop-overflow error)
1650 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1651 functions other can lead to crashes
1652 [24967] libc: jemalloc static linking causes runtime failure
1653 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1655 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1656 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1657 [25097] libc: new -Warray-bounds with GCC 10
1658 [25112] dynamic-link: dlopen must not make new objects accessible when it
1659 still can fail with an error
1660 [25139] localedata: Please add the new mnw_MM locale
1661 [25149] regex: Array bounds violation in proceed_next_node
1662 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1663 initialized correctly
1664 [25189] libc: glibc's __glibc_has_include causes issues with clang
1666 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1667 value to an unsigned
1668 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1669 binaries (CVE-2019-19126)
1670 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1672 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1674 [25232] string: <string.h> does not enable const correctness for strchr et
1676 [25233] localedata: Consider "." as the thousands separator for sl_SI
1678 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1679 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1680 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1682 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1683 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1685 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1686 (dl_initfirst) link map pointer
1687 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1688 [25423] libc: Array overflow in backtrace on powerpc
1689 [25425] network: Missing call to __resolv_context_put in
1690 getaddrinfo.c:gethosts
1697 * Unicode 12.1.0 Support: Character encoding, character type info, and
1698 transliteration tables are all updated to Unicode 12.1.0, using
1699 generator scripts contributed by Mike FABIAN (Red Hat).
1701 * The dynamic linker accepts the --preload argument to preload shared
1702 objects, in addition to the LD_PRELOAD environment variable.
1704 * The twalk_r function has been added. It is similar to the existing
1705 twalk function, but it passes an additional caller-supplied argument
1706 to the callback function.
1708 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1710 * Minguo (Republic of China) calendar support has been added as an
1711 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1714 * The entry for the new Japanese era has been added for ja_JP locale.
1716 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1717 pvalloc, memalign, and posix_memalign fail now with total object size
1718 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1719 pointer subtraction within the allocated object, where results might
1720 overflow the ptrdiff_t type.
1722 * The dynamic linker no longer refuses to load objects which reference
1723 versioned symbols whose implementation has moved to a different soname
1724 since the object has been linked. The old error message, symbol
1725 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1726 link time reference, is gone.
1728 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1729 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1730 functions. These behave similarly to their "timed" equivalents, but also
1731 accept a clockid_t parameter to determine which clock their timeout should
1732 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1733 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1734 time of the wait (unlike with pthread_condattr_setclock, which requires
1735 the clock choice at initialization time).
1737 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1738 work, new resolvers can use a second argument which can be extended in
1739 the future, currently it contains the AT_HWCAP2 value.
1741 Deprecated and removed features, and other changes affecting compatibility:
1743 * The copy_file_range function fails with ENOSYS if the kernel does not
1744 support the system call of the same name. Previously, user space
1745 emulation was performed, but its behavior did not match the kernel
1746 behavior, which was deemed too confusing. Applications which use the
1747 copy_file_range function can no longer rely on glibc to provide a fallback
1748 on kernels that do not support the copy_file_range system call, and if
1749 this function returns ENOSYS, they will need to use their own fallback.
1750 Support for copy_file_range for most architectures was added in version
1751 4.5 of the mainline Linux kernel.
1753 * The functions clock_gettime, clock_getres, clock_settime,
1754 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1755 for new applications (on architectures which had them). Instead, the
1756 definitions in libc will be used automatically, which have been available
1759 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1760 and <sys/stropts.h> have been removed.
1762 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1763 resolver flag (deprecated in glibc 2.25) have been removed.
1765 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1766 resolver have been removed from <resolv.h>.
1768 * With --enable-bind-now, installed programs are now linked with the
1771 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1772 configurations) has been removed, following the deprecation of this
1773 subarchitecture in version 8 of GCC, and its removal in version 9.
1775 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1776 header have been removed.
1778 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1779 deprecated and will be removed from a future version of glibc.
1780 Application should directly access /proc instead. For obtaining random
1781 bits, the getentropy function can be used.
1783 Changes to build and runtime requirements:
1785 * GCC 6.2 or later is required to build the GNU C Library.
1787 Older GCC versions and non-GNU compilers are still supported when
1788 compiling programs that use the GNU C Library.
1790 Security related changes:
1792 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1793 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1794 has undefined behavior. On x32, the size_t argument may be passed
1795 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1796 32 bits. When it happened with the sign bit of RDX register set,
1797 memcmp gave the wrong result since it treated the size argument as
1798 zero. Reported by H.J. Lu.
1800 CVE-2019-9169: Attempted case-insensitive regular-expression match
1801 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1802 over-read. Reported by Hongxu Chen.
1804 The following bugs are resolved with this release:
1806 [2872] locale: Transliteration Cyrillic -> ASCII fails
1807 [6399] libc: gettid() should have a wrapper
1808 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1809 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1810 [17396] localedata: globbing for locale by [[.collating-element.]]
1811 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1812 [18465] malloc: memusagestat is built using system C library
1813 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1814 invalid input drops valid char
1815 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1816 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1817 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1818 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1819 [23352] malloc: __malloc_check_init still defined in public header
1821 [23403] nptl: Wrong alignment of TLS variables
1822 [23501] libc: nftw() doesn't return dangling symlink's inode
1823 [23733] malloc: Check the count before calling tcache_get()
1824 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1826 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1827 [23844] nptl: pthread_rwlock_trywrlock results in hang
1828 [23983] argparse: Missing compat versions of argp_failure and argp_error
1829 for long double = double
1830 [23984] libc: Missing compat versions of err.h and error.h functions for
1831 long double = double
1832 [23996] localedata: Dutch salutations
1833 [24040] libc: riscv64: unterminated call chain in __thread_start
1834 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1836 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1837 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1839 [24114] regex: regexec buffer read overrun in "grep -i
1840 '\(\(\)*.\)*\(\)\(\)\1'"
1841 [24122] libc: Segfaults if 0 returned from la_version
1842 [24153] stdio: Some input functions do not react to stdin assignment
1843 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1844 RDX is set) (CVE-2019-7309)
1845 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1846 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1847 not the default "nor"
1848 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1849 false positives, change to modern flexible array
1850 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1851 instructions while maintaining the robust mutex list due to missing
1853 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1854 unnecessary librt dependencies
1855 [24200] localedata: Revert first_weekday removal in en_IE locale
1856 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1857 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1858 [24216] malloc: Check for large bin list corruption when inserting
1860 [24228] stdio: old x86 applications that use legacy libio crash on exit
1861 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1863 [24293] localedata: Missing Minguo calendar support for TW locales
1864 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1865 tt_RU (Tatar) locale
1866 [24307] localedata: Update locale data to Unicode 12.0.0
1867 [24323] dynamic-link: dlopen should not be able open PIE objects
1868 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1869 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1870 tt_RU (Tatar) locale
1871 [24370] localedata: Add lang_name for tt_RU locale
1872 [24372] locale: Binary locale files are not architecture independent
1873 [24394] time: strptime %Ey mis-parses final year of era
1874 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1876 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1878 [24531] malloc: Malloc tunables give tcache assertion failures
1879 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1881 [24535] localedata: Update locale data to Unicode 12.1.0
1882 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1883 kernels and break testing
1884 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1885 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1886 [-Werror=format-overflow=]
1887 [24570] libc: alpha: compat msgctl uses __IPC_64
1888 [24584] locale: Data race in __wcsmbs_clone_conv
1889 [24588] stdio: Remove codecvt vtables from libio
1890 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1892 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1893 [24632] stdio: Old binaries which use freopen with default stdio handles
1895 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1897 [24652] localedata: szl_PL spelling correction
1898 [24695] nss: nss_db: calling getpwent after endpwent crashes
1899 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1900 in /etc/nsswitch.conf
1901 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1902 [24740] libc: getdents64 type confusion
1903 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1904 always implemented in the same library
1905 [24744] libc: Remove copy_file_range emulation
1906 [24757] malloc: memusagestat is linked against system libpthread
1907 [24794] libc: Partial test suite run builds corrupt test-in-container
1915 * The getcpu wrapper function has been added, which returns the currently
1916 used CPU and NUMA node. This function is Linux-specific.
1918 * A new convenience target has been added for distribution maintainers
1919 to build and install all locales as directories with files. The new
1920 target is run by issuing the following command in your build tree:
1921 'make localedata/install-locale-files', with an optional DESTDIR
1922 to set the install root if you wish to install into a non-default
1923 configured location.
1925 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1927 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1928 for _GNU_SOURCE, to match BSD environments.
1930 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1931 indicates that it will abort the transaction prior to entering the kernel
1932 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1933 suspended, and this caused some undefined side-effects issues by aborting
1934 transactions manually. Glibc avoided it by abort transactions manually on
1935 each syscall, but it lead to performance issues on newer kernels where the
1936 HTM state is saved and restore lazily (the state being saved even when the
1937 process actually does not use HTM).
1939 * The functions posix_spawn_file_actions_addchdir_np and
1940 posix_spawn_file_actions_addfchdir_np have been added, enabling
1941 posix_spawn and posix_spawnp to run the new process in a different
1942 directory. These functions are GNU extensions. The function
1943 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1946 * The popen and system do not run atfork handlers anymore (BZ#17490).
1947 Although it is a possible POSIX violation, the POSIX rationale in
1948 pthread_atfork documentation regarding atfork handlers is to handle
1949 inconsistent mutex state after a fork call in a multi-threaded process.
1950 In both popen and system there is no direct access to user-defined mutexes.
1952 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1953 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1955 - C-SKY ABIV2 soft-float little-endian
1956 - C-SKY ABIV2 hard-float little-endian
1958 * strftime's default formatting of a locale's alternative year (%Ey)
1959 has been changed to zero-pad the year to a minimum of two digits,
1960 like "%y". This improves the display of Japanese era years during
1961 the first nine years of a new era, and is expected to be harmless
1962 for all other locales (only Japanese locales regularly have
1963 alternative year numbers less than 10). Zero-padding can be
1964 overridden with the '_' or '-' flags (which are GNU extensions).
1966 * As a GNU extension, the '_' and '-' flags can now be applied to
1967 "%EY" to control how the year number is formatted; they have the
1968 same effect that they would on "%Ey".
1970 Deprecated and removed features, and other changes affecting compatibility:
1972 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1973 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1975 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1976 in <sys/procfs.h>, has been corrected to match the type actually used by
1977 the Linux kernel. This affects the size and layout of that structure on
1978 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1980 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1981 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1982 defined in <sys/procfs.h>, has been corrected to match the type actually
1983 used by the Linux kernel. This affects the size and layout of those
1986 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1987 meant to scan a string and allocate space for it with malloc, is now
1988 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1989 defined. This extension conflicts with C99's use of '%a' to scan a
1990 hexadecimal floating-point number, which is now available to programs
1991 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1993 POSIX.1-2008 includes the feature of allocating a buffer for string input
1994 with malloc, using the modifier letter 'm' instead. Programs using
1995 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1996 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1997 C99 '%a' no longer need to avoid _GNU_SOURCE.
1999 GCC's -Wformat warnings can detect most uses of this extension, as long
2000 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
2001 __attribute__ ((format (scanf, ...))).
2003 Changes to build and runtime requirements:
2005 * Python 3.4 or later is required to build the GNU C Library.
2007 * On most architectures, GCC 5 or later is required to build the GNU C
2008 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
2010 Older GCC versions and non-GNU compilers are still supported when
2011 compiling programs that use the GNU C Library.
2013 Security related changes:
2015 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
2016 denial of service due to resource exhaustion when processing getaddrinfo
2017 calls with crafted host names. Reported by Guido Vranken.
2019 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
2020 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
2021 happened, accessing the 32-bit size_t value as the full 64-bit register
2022 in the assembly string/memory functions would cause a buffer overflow.
2023 Reported by H.J. Lu.
2025 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
2026 addresses with arbitrary trailing characters, potentially leading to data
2027 or command injection issues in applications.
2029 The following bugs are resolved with this release:
2031 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
2032 [10496] localedata: 12h time representation in multiple locales faulty
2033 [10797] localedata: it_IT locale numeric does not have a separator for
2035 [11319] libc: dprintf doesn't handle errors properly
2036 [16346] time: mktime: potentially unsafe use of localtime_offset
2037 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
2039 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
2040 posix_spawn_file_actions_addfchdir_np
2041 [17426] localedata: Indian locales: set the correct date format
2042 [17490] stdio: popen should not invoke atfork handlers
2043 [17783] libc: TIOCSER_TEMT conditions inconsistent
2044 [18040] regex: use-after-free in regexec/get_subexp
2045 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
2046 [20018] network: getaddrinfo should reject IP addresses with trailing
2047 characters (CVE-2016-10739)
2048 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
2049 [20271] libc: Missing "\n" in __libc_fatal calls
2050 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
2051 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
2052 pointer argument is non-NULL
2053 [21037] stdio: open_memstream and freopen
2054 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
2055 [21716] time: Crash in glibc's mktime in low-memory situations
2056 [22834] stdio: Subprocess forked by popen may crash in Linux when
2057 multithreads call popen
2058 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
2059 and pthread_create fails.
2060 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
2061 [23125] libc: riscv64: endless loop when throwing an exception from a
2063 [23275] nptl: Race in pthread_mutex_lock while promoting to
2064 PTHREAD_MUTEX_ELISION_NP.
2065 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
2067 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
2069 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
2071 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
2072 [23509] dynamic-link: CET enabled glibc is incompatible with the older
2074 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
2075 [23521] nss: get_next_alias nss_files file stream leak
2076 [23538] nptl: Hang in pthread_cond_broadcast
2077 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
2078 [23578] regex: Invalid memory access if regex pattern contains NUL byte
2079 [23579] libc: Errors misreported in preadv2
2080 [23597] build: support/test-container.c doesn't work with different
2082 [23603] time: mktime signed integer overflow on large timestamps
2083 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
2084 [23614] libc: powerpc: missing CFI register information in __mpn_*
2086 [23637] string: Generic strstr/strcasestr fails with huge needles
2087 [23640] libc: no way to easily clear FD_CLOEXEC in
2088 posix_spawn_file_actions_adddup2()
2089 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
2091 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
2093 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
2094 [23689] libc: Bug in documentation for rusage.ru_ixrss in
2095 bits/types/struct_rusage.h
2096 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
2098 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
2100 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
2101 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
2102 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
2104 [23724] localedata: Albanian date formats are incorrect
2105 [23735] math: libnldbl_nonshared.a references internal libm symbols
2106 [23740] localedata: kl_GL: Month names and date formats need update
2107 [23744] regex: regex refactorings to remove BE, avoid duplication
2108 [23745] time: mktime fix for Gnulib + coreutils
2109 [23758] time: Improve the width of alternate representation for year in
2111 [23783] libc: [mips] Missing CMSPAR bits/termios.h
2112 [23789] time: mktime does not set errno on failure
2113 [23791] localedata: Wrong monetary format for ca_ES locale
2114 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
2115 [23794] locale: c16rtomb does not handle surrogate pairs
2116 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
2117 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
2118 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
2119 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
2120 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
2121 [23862] libc: [sh] missing kernel-features.h undefines
2122 [23864] libc: [riscv] missing kernel-features.h undefines
2123 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
2124 [23907] malloc: Incorrect double-free malloc tcache check disregards
2126 [23913] libc: off-by-one in function maybe_script_execute in
2127 sysdeps/posix/spawni.c
2128 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
2129 [23923] locale: Add --no-hard-links option to localedef
2130 [23927] network: Linux if_nametoindex() does not close descriptor
2132 [23961] math: powf can overflow to inf without setting errno in non-
2133 nearest rounding mode
2134 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
2135 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
2136 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
2137 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
2138 [24011] localedata: Fixed small type in comment for locale bs_BA
2139 [24018] libc: gettext() may return NULL
2140 [24022] build: riscv build failure with Linux kernel 4.20-rc7
2141 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
2142 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
2144 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
2145 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2147 [24046] localedata: en_US locale doesn't define date_fmt
2148 [24063] manual: @var{errno} should be @code{errno}
2149 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2150 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2152 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2154 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2156 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2158 [24112] network: Do not send DNS queries for non-host names (where all
2159 answers will be rejected)
2160 [24130] libc: alpha __remqu corrupts $f3 register
2167 * The localization data for ISO 14651 is updated to match the 2016
2168 Edition 4 release of the standard, this matches data provided by
2169 Unicode 9.0.0. This update introduces significant improvements to the
2170 collation of Unicode characters. This release deviates slightly from
2171 the standard in that the collation element ordering for lowercase and
2172 uppercase LATIN script characters is adjusted to ensure that regular
2173 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2174 is not matched by [a-z]. With the update many locales have been
2175 updated to take advantage of the new collation information. The new
2176 collation information has increased the size of the compiled locale
2177 archive or binary locales.
2179 * The GNU C Library can now be compiled with support for Intel CET, AKA
2180 Intel Control-flow Enforcement Technology. When the library is built
2181 with --enable-cet, the resulting glibc is protected with indirect
2182 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2183 compatible with all existing executables and shared libraries. This
2184 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2185 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2186 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2187 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2188 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2189 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2192 * The GNU C Library now has correct support for ABSOLUTE symbols
2193 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2194 relocated incorrectly or in some cases discarded. The GNU linker can
2195 make use of the newer semantics, but it must communicate it to the
2196 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2197 field) to indicate such support is required.
2199 * Unicode 11.0.0 Support: Character encoding, character type info, and
2200 transliteration tables are all updated to Unicode 11.0.0, using
2201 generator scripts contributed by Mike FABIAN (Red Hat).
2203 * <math.h> functions that round their results to a narrower type are added
2204 from TS 18661-1:2014 and TS 18661-3:2015:
2206 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2207 fMxaddfNx functions.
2209 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2210 fMxsubfNx functions.
2212 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2213 fMxmulfNx functions.
2215 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2216 fMxdivfNx functions.
2218 * Two grammatical forms of month names are now supported for the following
2219 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2220 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2221 support two grammatical forms in abbreviated month names: Catalan, Greek,
2224 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2225 include the support for two grammatical forms of month names.
2227 * Building and running on GNU/Hurd systems now works without out-of-tree
2230 * The renameat2 function has been added, a variant of the renameat function
2231 which has a flags argument. If the flags are zero, the renameat2 function
2232 acts like renameat. If the flag is not zero and there is no kernel
2233 support for renameat2, the function will fail with an errno value of
2234 EINVAL. This is different from the existing gnulib function renameatu,
2235 which performs a plain rename operation in case of a RENAME_NOREPLACE
2236 flags and a non-existing destination (and therefore has a race condition
2237 that can clobber the destination inadvertently).
2239 * The statx function has been added, a variant of the fstatat64
2240 function with an additional flags argument. If there is no direct
2241 kernel support for statx, glibc provides basic stat support based on
2242 the fstatat64 function.
2244 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2245 library if installed. libidn2 version 2.0.5 or later is recommended. If
2246 libidn2 is not available, internationalized domain names are not encoded
2247 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2248 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2249 with an encoding error.) Flags which used to change the IDN encoding and
2250 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2251 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2252 deprecated. They no longer have any effect.
2254 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2255 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2256 range of ELF gABI expressions including such constructs as
2257 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2258 have been further restricted, and where in the past a dynamic string
2259 token sequence may have been interpreted as a literal string it will
2260 now cause a load failure. These load failures were always considered
2261 unspecified behaviour from the perspective of the dynamic loader, and
2262 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2263 results in a load failure now.
2265 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2266 implementation includes all the standard functions provided by
2269 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2270 thrd_detach, thrd_exit, and thrd_join for thread management.
2272 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2273 mtx_destroy for mutual exclusion.
2275 - call_once for function call synchronization.
2277 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2278 cnd_wait for conditional variables.
2280 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2282 Application developers must link against libpthread to use ISO C threads.
2284 Deprecated and removed features, and other changes affecting compatibility:
2286 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2287 installed. Software that was using either header should be updated to
2288 use standard <stdio.h> interfaces instead.
2290 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2291 This was never required by the C standard, and the macros just expanded
2292 to call alternative names for the same functions. If you hoped getc and
2293 putc would provide performance improvements over fgetc and fputc, instead
2294 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2295 necessary, flockfile and funlockfile.
2297 * All stdio functions now treat end-of-file as a sticky condition. If you
2298 read from a file until EOF, and then the file is enlarged by another
2299 process, you must call clearerr or another function with the same effect
2300 (e.g. fseek, rewind) before you can read the additional data. This
2301 corrects a longstanding C99 conformance bug. It is most likely to affect
2302 programs that use stdio to read interactive input from a terminal.
2305 * The macros 'major', 'minor', and 'makedev' are now only available from
2306 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2307 headers that happen to include <sys/types.h>. These macros are rarely
2308 used, not part of POSIX nor XSI, and their names frequently collide with
2309 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2310 further explanation.
2312 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2313 these macros should first include <sys/types.h>, and then include
2314 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2316 * The tilegx*-*-linux-gnu configurations are no longer supported.
2318 * The obsolete function ustat is no longer available to newly linked
2319 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2320 function has been deprecated in favor of fstatfs and statfs.
2322 * The obsolete function nfsservctl is no longer available to newly linked
2323 binaries. This function was specific to systems using the Linux kernel
2324 and could not usefully be used with the GNU C Library on systems with
2325 version 3.1 or later of the Linux kernel.
2327 * The obsolete function name llseek is no longer available to newly linked
2328 binaries. This function was specific to systems using the Linux kernel
2329 and was not declared in a header. Programs should use the lseek64 name
2330 for this function instead.
2332 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2333 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2334 previously selected by them is now always enabled.
2336 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2337 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2338 restriction (rejecting '_' in host names, among other things) has been
2339 removed, for increased compatibility with non-IDN name resolution.
2341 * The fcntl function now have a Long File Support variant named fcntl64. It
2342 is added to fix some Linux Open File Description (OFD) locks usage on non
2343 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2344 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2345 locks act as a cancellation entrypoint.
2347 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2348 ecb_crypt, and des_setparity are no longer available to newly linked
2349 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2350 longer installed. These functions encrypted and decrypted data with the
2351 DES block cipher, which is no longer considered secure. Software that
2352 still uses these functions should switch to a modern cryptography library,
2355 * Reflecting the removal of the encrypt and setkey functions above, the
2356 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2357 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2360 * The obsolete function fcrypt is no longer available to newly linked
2361 binaries. It was just another name for the standard function crypt,
2362 and it has not appeared in any header file in many years.
2364 * We have tentative plans to hand off maintenance of the passphrase-hashing
2365 library, libcrypt, to a separate development project that will, we hope,
2366 keep up better with new passphrase-hashing algorithms. We will continue
2367 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2368 'crypt_r' should not need to change at all; however, distributions will
2369 need to install <crypt.h> and libcrypt from a separate project.
2371 In this release, if the configure option --disable-crypt is used, glibc
2372 will not install <crypt.h> or libcrypt, making room for the separate
2373 project's versions of these files. The plan is to make this the default
2374 behavior in a future release.
2376 Changes to build and runtime requirements:
2378 GNU make 4.0 or later is now required to build glibc.
2380 Security related changes:
2382 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2383 been fixed by removing the glibc-internal IDNA implementation and using
2384 the system-provided libidn2 library instead. Originally reported by Hanno
2385 Böck and Christian Weisgerber.
2387 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2388 architecture could corrupt memory. Reported by Max Horn.
2390 CVE-2018-11236: Very long pathname arguments to realpath function could
2391 result in an integer overflow and buffer overflow. Reported by Alexey
2394 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2395 architecture could write beyond the target buffer, resulting in a buffer
2396 overflow. Reported by Andreas Schwab.
2398 The following bugs are resolved with this release:
2400 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2401 [6889] manual: 'PWD' mentioned but not specified
2402 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2403 when __WORDSIZE != 64
2404 [13762] regex: re_search etc. should return -2 on memory exhaustion
2405 [13888] build: /tmp usage during testing
2406 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2407 [14092] nptl: Support C11 threads
2408 [14095] localedata: Review / update collation data from Unicode / ISO
2410 [14508] libc: -Wformat warnings
2411 [14553] libc: Namespace pollution loff_t in sys/types.h
2412 [14890] libc: Make NT_PRFPREG canonical.
2413 [15105] libc: Extra PLT references with -Os
2414 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2416 [16335] manual: Feature test macro documentation incomplete and out of
2418 [16552] libc: Unify umount implementations in terms of umount2
2419 [17082] libc: htons et al.: statement-expressions prevent use on global
2420 scope with -O1 and higher
2421 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2422 [17438] localedata: pt_BR: wrong d_fmt delimiter
2423 [17662] libc: please implement binding for the new renameat2 syscall
2424 [17721] libc: __restrict defined as /* Ignore */ even in c11
2425 [17979] libc: inconsistency between uchar.h and stdint.h
2426 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2427 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2428 horrible machine code)
2429 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2431 [18471] libc: llseek should be a compat symbol
2432 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2434 [18991] nss: nss_files skips large entry in database
2435 [19239] libc: Including stdlib.h ends up with macros major and minor being
2437 [19463] libc: linknamespace failures when compiled with -Os
2438 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2439 [19527] locale: Normalized charset name not recognized by setlocale
2440 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2441 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2443 [19728] network: out of bounds stack read in libidn function
2444 idna_to_ascii_4i (CVE-2016-6261)
2445 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2446 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2447 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2449 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2450 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2451 [20419] dynamic-link: files with large allocated notes crash in
2453 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2454 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2455 [20980] manual: CFLAGS environment variable replaces vital options
2456 [21163] regex: Assertion failure in pop_fail_stack when executing a
2457 malformed regexp (CVE-2015-8985)
2458 [21234] manual: use of CFLAGS makes glibc detect no optimization
2459 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2460 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2461 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2462 [21508] locale: intl/tst-gettext failure with latest msgfmt
2463 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2464 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2465 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2467 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2469 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2470 [22247] network: Integer overflow in the decode_digit function in
2471 puny_decode.c in libidn (CVE-2017-14062)
2472 [22342] nscd: NSCD not properly caching netgroup
2473 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2474 [22550] localedata: es_ES locale (and other es_* locales): collation
2475 should treat ñ as a primary different character, sync the collation
2476 for Spanish with CLDR
2477 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2478 by gcc configured with --enable-default-pie
2479 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2480 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2481 crossing 2GB threshold (CVE-2017-18269)
2482 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2484 [22735] time: Misleading typo in time.h source comment regarding
2486 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2487 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2488 `__assert_perror_fail ()' to `__assert_fail_base ()'
2489 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2491 [22786] libc: Stack buffer overflow in realpath() if input size is close
2492 to SSIZE_MAX (CVE-2018-11236)
2493 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2494 through an absolute DT_NEEDED path
2495 [22792] build: tcb-offsets.h dependency dropped
2496 [22797] libc: pkey_get() uses non-reserved name of argument
2497 [22807] libc: PTRACE_* constants missing for powerpc
2498 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2499 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2500 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2501 [22848] localedata: ca_ES: update date definitions from CLDR
2502 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2503 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2504 [22896] localedata: Update locale data for an_ES
2505 [22902] math: float128 test failures with GCC 8
2506 [22918] libc: multiple common of `__nss_shadow_database'
2507 [22919] libc: sparc32: backtrace yields infinite backtrace with
2509 [22926] libc: FTBFS on powerpcspe
2510 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2512 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2513 [22947] libc: FAIL: misc/tst-preadvwritev2
2514 [22963] localedata: cs_CZ: Add alternative month names
2515 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2516 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2517 [22998] dynamic-link: execstack tests are disabled when SELinux is
2519 [23005] network: Crash in __res_context_send after memory allocation
2521 [23007] math: strtod cannot handle -nan
2522 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2523 [23036] regex: regex equivalence class regression
2524 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2525 [23069] libc: sigaction broken on riscv64-linux-gnu
2526 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2527 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2528 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2529 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2530 and libc build with -Os)
2531 [23140] localedata: More languages need two forms of month names
2532 [23145] libc: _init/_fini aren't marked as hidden
2533 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2534 [23171] math: C++ iseqsig for long double converts arguments to double
2535 [23178] nscd: sudo will fail when it is run in concurrent with commands
2536 that changes /etc/passwd
2537 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2539 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2540 [23208] localedata: New locale - Lower Sorbian (dsb)
2541 [23233] regex: Memory leak in build_charclass_op function in file
2543 [23236] stdio: Harden function pointers in _IO_str_fields
2544 [23250] nptl: Offset of __private_ss differs from GCC
2545 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2546 -mtune=generic -mfpmath=sse
2547 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2549 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2550 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2552 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2553 [23277] math: nan function should not have const attribute
2554 [23279] math: scanf and strtod wrong for some hex floating-point
2555 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2557 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2558 [23303] build: undefined reference to symbol
2559 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2560 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2562 [23313] stdio: libio vtables validation and standard file object
2564 [23329] libc: The __libc_freeres infrastructure is not properly run across
2566 [23349] libc: Various glibc headers no longer compatible with
2568 [23351] malloc: Remove unused code related to heap dumps and malloc
2570 [23363] stdio: stdio-common/tst-printf.c has non-free license
2571 [23396] regex: Regex equivalence regression in single-byte locales
2572 [23422] localedata: oc_FR: More updates of locale data
2573 [23442] build: New warning with GCC 8
2574 [23448] libc: Out of bounds access in IBM-1390 converter
2575 [23456] libc: Wrong index_cpu_LZCNT
2576 [23458] build: tst-get-cpu-features-static isn't added to tests
2577 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2579 [23467] dynamic-link: x86/CET: A property note parser bug
2586 * The GNU C Library can now be compiled with support for building static
2587 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2588 executables are like static executables but can be loaded at any address
2589 and provide additional security hardening benefits at the cost of some
2590 memory and performance. When the library is built with --enable-static-pie
2591 the resulting libc.a is usable with GCC 8 and above to create static PIE
2592 executables using the GCC option '-static-pie'. This feature is currently
2593 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2594 aarch64 with binutils 2.30 or later.
2596 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2597 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2600 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2602 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2604 * In order to support faster and safer process termination the malloc API
2605 family of functions will no longer print a failure address and stack
2606 backtrace after detecting heap corruption. The goal is to minimize the
2607 amount of work done after corruption is detected and to avoid potential
2608 security issues in continued process execution. Reducing shutdown time
2609 leads to lower overall process restart latency, so there is benefit both
2610 from a security and performance perspective.
2612 * The abort function terminates the process immediately, without flushing
2613 stdio streams. Previous glibc versions used to flush streams, resulting
2614 in deadlocks and further data corruption. This change also affects
2615 process aborts as the result of assertion failures.
2617 * On platforms where long double has the IEEE binary128 format (aarch64,
2618 alpha, mips64, riscv, s390 and sparc), the math library now implements
2619 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2620 These are the same interfaces added in version 2.26 for some platforms where
2621 this format is supported but is not the format of long double.
2623 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2624 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2625 implements interfaces for that type, as defined by ISO/IEC TS
2626 18661-3:2015. These are corresponding interfaces to those supported for
2629 * The math library now implements interfaces for the _Float32, _Float64 and
2630 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2631 corresponding interfaces to those supported for _Float128.
2633 * glibc now implements the memfd_create and mlock2 functions on Linux.
2635 * Support for memory protection keys was added. The <sys/mman.h> header now
2636 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2639 * The copy_file_range function was added.
2641 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2643 * The ldconfig utility now processes `include' directives using the C/POSIX
2644 collation ordering. Previous glibc versions used locale-specific
2645 ordering, the change might break systems that relied on that.
2647 * Support for two grammatical forms of month names has been added.
2648 In a call to strftime, the "%B" and "%b" format specifiers will now
2649 produce the grammatical form required when the month is used as part
2650 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2651 required when the month is named by itself. For instance, in Greek
2652 and in many Slavic and Baltic languages, "%B" will produce the month
2653 in genitive case, and "%OB" will produce the month in nominative case.
2655 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2656 are all valid and will all accept any known form of month
2657 name---standalone or complete, abbreviated or full. In a call to
2658 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2659 the strings used by "%B" and "%b", respectively. New query
2660 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2661 used by "%OB" and "%Ob", respectively.
2663 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2664 define the strings for %OB and %Ob, respectively; these have the
2665 same syntax as "mon" and "abmon". These arrays are optional; if they
2666 are not provided then they have the same content as "mon" and "abmon",
2669 These features are provided for locales which define "alt_mon" and/or
2670 "ab_alt_mon" in their locale source data. This release includes such
2671 alternative month name data for the following languages: Belarusian,
2672 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2674 This feature is currently a GNU extension, but it is expected to
2675 be added to the next revision of POSIX, and it is also already
2676 available on some BSD-derived operating systems.
2678 This feature will cause existing statically compiled applications
2679 to fail to load locales and fall back to the builtin C/POSIX locales.
2680 See notes below for other changes affecting compatibility.
2682 * Support for the RISC-V ISA running on Linux has been added. This port
2683 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2684 for the following ISA and ABI pairs:
2690 Deprecated and removed features, and other changes affecting compatibility:
2692 * Statically compiled applications attempting to load locales compiled for the
2693 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2694 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2695 support for two grammatical forms of the month names, also extends the locale
2696 data binary format. Static applications needing locale support must be
2697 recompiled to match the runtime and data they are deployed with. In some
2698 distributions there is an upgrade window where dynamically linked applications
2699 may use a new library but the old locale data and also fall back to the
2700 builtin C/POSIX locales; restarting the application process is sufficient to
2703 * Support for statically linked applications which call dlopen is deprecated
2704 and will be removed in a future version of glibc. Applications which call
2705 dlopen need to be linked dynamically instead.
2707 * Support for old programs which use internal stdio data structures and
2708 functions is deprecated. This includes programs which use the C++ streams
2709 provided by libstdc++ in GCC 2.95. Programs which use the internal
2710 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2711 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2712 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2713 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2714 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2715 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2716 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2717 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2718 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2719 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2720 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2721 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2722 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2723 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2724 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2725 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2726 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2727 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2728 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2729 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2730 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2731 future version of glibc. Unlike other symbol removals, these old
2732 applications will not be supported using compatibility symbols.
2734 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2735 defined by <sys/ptrace.h>.
2737 * libm no longer supports SVID error handling (calling a user-provided
2738 matherr function on error) or the _LIB_VERSION variable to control error
2739 handling. (SVID error handling and the _LIB_VERSION variable still work
2740 for binaries linked against older versions of the GNU C Library.) The
2741 libieee.a library is no longer provided. math.h no longer defines struct
2742 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2743 TLOSS, PLOSS and HUGE.
2745 * The libm functions pow10, pow10f and pow10l are no longer supported for
2746 new programs. Programs should use the standard names exp10, exp10f and
2747 exp10l for these functions instead.
2749 * The mcontext_t type is no longer the same as struct sigcontext. On
2750 platforms where it was previously the same, this changes the C++ name
2751 mangling for interfaces involving this type.
2753 * The add-ons mechanism for building additional packages at the same time as
2754 glibc has been removed. The --enable-add-ons configure option is now
2757 * The --without-fp configure option is now ignored. Whether hardware
2758 floating-point instructions are used is now configured based on whether
2759 the compiler used at configure time (without any options implied by a
2760 --with-cpu= configure option) uses such instructions.
2762 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2763 the specified string can be parsed as a domain name.
2765 * In the malloc_info output, the <heap> element may contain another <aspace>
2766 element, "subheaps", which contains the number of sub-heaps.
2768 * The libresolv function p_secstodate is no longer supported for new
2771 * The tilepro-*-linux-gnu configuration is no longer supported.
2773 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2774 and will be removed in a future release. Software that is still using
2775 either header should be updated to use standard <stdio.h> interfaces
2778 libio.h was originally the header for a set of supported GNU extensions,
2779 but they have not been maintained as such in many years, they are now
2780 standing in the way of improvements to stdio, and we don't think there are
2781 any remaining external users. _G_config.h was never intended for public
2782 use, but predates the bits convention.
2784 Changes to build and runtime requirements:
2786 * bison version 2.7 or later is required to generate code in the 'intl'
2789 Security related changes:
2791 CVE-2009-5064: The ldd script would sometimes run the program under
2792 examination directly, without preventing code execution through the
2793 dynamic linker. (The glibc project disputes that this is a security
2794 vulnerability; only trusted binaries must be examined using the ldd
2797 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2798 suffered from a one-byte overflow during ~ operator processing (either
2799 on the stack or the heap, depending on the length of the user name).
2800 Reported by Tim Rühsen.
2802 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2803 would sometimes fail to free memory allocated during ~ operator
2804 processing, leading to a memory leak and, potentially, to a denial
2807 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2808 without GLOB_NOESCAPE, could write past the end of a buffer while
2809 unescaping user names. Reported by Tim Rühsen.
2811 CVE-2017-17426: The malloc function, when called with an object size near
2812 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2813 instead of NULL. This was a regression introduced with the new malloc
2814 thread cache in glibc 2.26. Reported by Iain Buclaw.
2816 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2817 to the allocation of too much memory. (This is not a security bug per se,
2818 it is mentioned here only because of the CVE assignment.) Reported by
2821 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2822 of the number of search path components. (This is not a security
2823 vulnerability per se because no trust boundary is crossed if the fix for
2824 CVE-2017-1000366 has been applied, but it is mentioned here only because
2825 of the CVE assignment.) Reported by Qualys.
2827 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2828 for AT_SECURE or SUID binaries could be used to load libraries from the
2831 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2832 succeeds without returning an absolute path due to unexpected behaviour
2833 of the Linux kernel getcwd syscall. Reported by halfdog.
2835 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2836 an object size near the value of SIZE_MAX, would return a pointer to a
2837 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2839 CVE-2018-6551: The malloc function, when called with an object size near
2840 the value of SIZE_MAX, would return a pointer to a buffer which is too
2841 small, instead of NULL.
2843 The following bugs are resolved with this release:
2845 [866] glob: glob should match dangling symlinks
2846 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2847 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2849 [5997] math: Very slow execution of sinf function
2850 [10580] localedata: hr_HR: updated locale
2851 [10871] locale: 'mon' array should contain both nominative and genitive
2853 [12349] localedata: eu_ES: incorrect thousands separator
2854 [13605] localedata: shn_MM: new Shan locale
2855 [13805] localedata: ru_RU: currency should use ',' as radix point
2856 [13953] localedata: km_KH: locale update
2857 [13994] localedata: mjw_IN: new locale
2858 [14121] build: make writes .mo files in po directory
2859 [14333] libc: Fix the race between atexit() and exit()
2860 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2861 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2863 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2864 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2865 width Latin characters
2866 [15332] localedata: es_CU: locale update
2867 [15436] stdio: Don't close or flush stdio streams on abort
2868 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2870 [16148] localedata: ca_ES: incorrect thousands separator
2871 [16750] dynamic-link: ldd should not try to execute the binaries
2873 [16777] localedata: pl_PL: incorrect thousands separator in locale
2874 [16905] localedata: hanzi: new collation
2875 [17563] localedata: cmn_TW: add hanzi collation
2876 [17750] localedata: wrong collation order of diacritics in most locales
2877 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2879 [17956] build: Build fails on missing definitions from header file
2880 nss/nss.h when Mozilla NSS is used for cryptography
2881 [18203] libc: realpath() does not handle unreachable paths correctly
2882 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2883 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2884 [18822] libc: Internal functions are called via PLT
2885 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2886 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2887 [19574] libc: glibc should support building static PIE binaries
2888 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2890 [19971] glob: glob: Do not skip entries with zero d_ino values
2891 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2892 [20008] localedata: km_KH: convert to translit_neutral
2893 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2894 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2895 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2896 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2897 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2899 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2900 they're set, wrong errors returned by gaih_inet when lookup functions
2902 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2903 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2905 [20952] localedata: yuw_PG: new locale
2906 [21084] localedata: charmaps/IBM858: new codepage
2907 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2908 [21242] libc: assert gives pedantic warning in old gcc versions
2909 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2910 __regcall calling convention
2911 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2912 [21326] libc: C99 functions are not declared for C++11 and later if
2913 _GNU_SOURCE is not predefined by g++
2914 [21457] libc: sys/ucontext.h namespace
2915 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2916 [21660] math: GCC fails to compile a formula with tgmath.h
2917 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2918 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2919 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2920 [21684] math: tgmath.h handling of complex integers
2921 [21685] math: tgmath.h handling of bit-fields
2922 [21686] math: tgmath.h handling of __int128
2923 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2925 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2927 [21750] localedata: column width of characters incompatible with classical
2929 [21754] malloc: malloc: Perform as little work as possible after heap
2930 consistency check failures
2931 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2932 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2933 [21791] string: Unused XXX_chk_XXX functions in libc.a
2934 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2936 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2938 [21845] localedata: Added new Locale bho_NP
2939 [21853] localedata: Fix abday Which looks same as day in zh_SG
2940 [21854] localedata: Added New Locale en_SC
2941 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2942 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2943 _dl_runtime_resolve_avx_slow
2944 [21885] network: getaddrinfo: gethosts does not release resolver context
2945 on memory allocation failure
2946 [21899] libc: XPG4.2 sigaction namespace
2947 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2949 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2951 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2952 errno value, causing getaddrinfo to fail
2953 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2954 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2955 instead of EAI_NODATA
2956 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2957 constant PTRACE_SEIZE_DEVEL
2958 [21930] math: C-only gcc builtins used in <math.h> isinf
2959 [21932] network: Unpaired __resolv_context_get in generic get*_r
2961 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2962 [21944] libc: sigval namespace
2963 [21951] localedata: Update hanzi collation by stroke
2964 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2965 sysdeps/x86_64/fpu/e_expf.S
2966 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2967 allocation in syscall loops)
2968 [21959] localedata: Fix Country name for xh_ZA
2969 [21960] localedata: Fix abmon for bem_ZM
2970 [21966] math: AVX2 mathvec functions use FMA without checking
2971 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2972 [21971] localedata: Added New Locale for mfe_MU
2973 [21972] libc: assert macro requires operator== (int) for its argument type
2974 [21973] math: [sparc] libm missing sqrtl compat symbol
2975 [21974] libc: Remove __bb_init_func and __bb_exit_func
2976 [21982] string: stratcliff.c: error: assuming signed overflow does not
2978 [21986] stdio: __guess_grouping is called incorrectly
2979 [21987] math: [sparc32] wrong bits/long-double.h installed
2980 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2982 [22022] localedata: Missing country_name for mni_IN
2983 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2985 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2987 [22026] locale: iconv_open: heap overflow on gconv_init failure
2988 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2989 [22035] math: [m68k] bits/math-inline.h macro namespace
2990 [22038] localedata: Fix abbreviated weeks and months for Somali
2991 [22044] localedata: Remove redundant data for Limburgish Language
2992 [22050] malloc: Linking with -lmcheck does not hook
2993 __malloc_initialize_hook correctly
2994 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2995 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2996 [22070] localedata: charmaps/UTF-8: wcwidth for
2997 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2998 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2999 Jungseong and Jongseong) should be 0
3000 [22078] nss: nss_files performance issue in multi mode
3001 [22082] math: bits/math-finite.h exp10 condition
3002 [22086] libc: pcprofiledump incorrect cross-endian condition
3003 [22093] dynamic-link: ld.so no longer searches in .../x86_64
3004 [22095] network: Name server address allocation memory leak in resolv.conf
3006 [22096] network: __resolv_conf_attach can incorrectly free passed conf
3008 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
3009 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
3011 [22111] malloc: malloc: per thread cache is not returned when thread exits
3012 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
3013 [22134] libc: [linux] implement fexecve with execveat
3014 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
3016 [22145] libc: ttyname() gives up too early in the face of namespaces
3017 [22146] math: C++ build issue with float128 on x86_64
3018 [22153] nptl: nptl: save error code before process termination
3019 [22156] libc: [hppa,ia64,microblaze] Executable stack default
3020 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
3021 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
3022 [22165] libc: [hppa] Text relocations in libc.so
3023 [22180] libc: destructor registered via __cxa_atexit is called twice
3024 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
3025 symlinks") cause "make" segfaults
3026 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
3028 [22207] libc: FAIL: stdlib/test-atexit-race
3029 [22225] math: nearbyint arithmetic moved before feholdexcept
3030 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
3031 [22235] math: iscanonical in C++ and float128
3032 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
3033 the svid compat wrapper
3034 [22244] math: ynf and yn are wrong without the svid compat wrapper
3035 [22273] libc: Improper assert in Linux posix_spawn implementation
3036 [22284] libc: -pg -pie doesn't work
3037 [22292] locale: localedef exits with error 4 when it should be error 1
3038 [22294] locale: Allow "" for int_currency_symbol definition in locales.
3039 [22295] locale: Don't warn on non-symbolic characters in locale sources in
3041 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
3042 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
3044 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
3045 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
3046 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
3047 [22322] libc: [mips64] wrong bits/long-double.h installed
3048 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
3049 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
3051 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
3052 [22343] malloc: Integer overflow in posix_memalign
3053 [22347] libc: getrandom() returns the number of bytes that were copied to
3054 the buffer even though the comments say "Return 0 on success and -1 on
3056 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
3057 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
3059 [22370] dynamic-link: Incorrect note padding check
3060 [22375] libc: malloc returns pointer from tcache_get when should return
3061 NULL (CVE-2017-17426)
3062 [22377] math: iseqsig, float128 and C++
3063 [22382] localedata: Error in tpi_PG locale
3064 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
3065 inside the ASCII printable range
3066 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
3068 [22403] localedata: Slash needs escaping in some locales
3069 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
3070 [22409] network: res_hnok does not accept some host names used on the
3072 [22412] network: res_dnok, res_hnok should perform syntax checks
3073 [22413] network: ns_name_pton ignores syntactically invalid trailing
3075 [22415] stdio: setvbuf can lead to invalid free/segfault
3076 [22432] build: Non-deterministic build
3077 [22439] malloc: malloc_info should compute summary statistics for all sub-
3079 [22442] network: if_nametoindex could report index for the wrong
3080 networking interface
3081 [22446] build: aliasing violation calling readlink in handle_request
3082 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
3083 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
3084 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
3085 __nscd_hash/__nss_hash
3086 [22463] network: p_secstodate overflow handling
3087 [22469] localedata: pl_PL LC_COLLATE does not use i18n
3088 [22478] libc: sigwait can fail with EINTR
3089 [22505] libc: ldconfig processes include directive in locale-specific
3091 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
3092 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
3093 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
3094 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
3095 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
3096 [22534] localedata: Collation rules for Serbian and Bosnian should be the
3097 same as for Croatian
3098 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
3099 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
3100 [22577] libc: missing newline after "cannot allocate TLS data structures
3102 [22588] manual: manual/conf.texi: missing underscore in front of
3104 [22593] math: nextafter and nexttoward are declared with const attribute
3105 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
3106 [22603] string: ia64 memchr overflows internal pointer check
3107 [22605] libc: SH clone does not set the exit code correctly
3108 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
3110 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
3111 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
3112 modified in case of success
3113 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
3114 [22615] manual: manual: ambiguous wording about errno value in case of
3116 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
3118 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
3119 binaries or if /proc is not mounted (CVE-2017-16997)
3120 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
3121 [22630] build: $(no-pie-ldflag) is no longer effective
3122 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
3123 [22635] nptl: pthread_self returns NULL before libpthread is loaded
3124 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
3125 [22637] nptl: guard size is subtracted from thread stack size instead of
3127 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
3128 [22657] localedata: hu_HU: Avoid double space in date
3129 [22660] math: fmax, fmin sNaN handling on alpha
3130 [22664] libc: New warning of GCC8
3131 [22665] math: alpha: ceil and floor raise inexact exceptions
3132 [22666] math: alpha: trunc raise inexact exceptions
3133 [22667] libc: makecontext lacks stack alignment on i386
3134 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
3135 [22679] libc: getcwd(3) can succeed without returning an absolute path
3137 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
3138 elision and tunables
3139 [22687] math: [powerpc-nofpu] complex long double functions spurious
3141 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
3142 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
3143 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
3145 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
3146 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3148 [22701] nis: Incomplete removal of libnsl
3149 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3150 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3151 [22715] dynamic-link: FAIL: elf/tst-audit10
3152 [22719] libc: Backtrace tests fail on hppa
3153 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3154 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3155 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3156 before the first call to crypt_r () in crypt/badsalttest.c
3163 * A per-thread cache has been added to malloc. Access to the cache requires
3164 no locks and therefore significantly accelerates the fast path to allocate
3165 and free small amounts of memory. Refilling an empty cache requires locking
3166 the underlying arena. Performance measurements show significant gains in a
3167 wide variety of user workloads. Workloads were captured using a special
3168 instrumented malloc and analyzed with a malloc simulator. Contributed by
3169 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3171 * Unicode 10.0.0 Support: Character encoding, character type info, and
3172 transliteration tables are all updated to Unicode 10.0.0, using
3173 generator scripts contributed by Mike FABIAN (Red Hat).
3174 These updates cause user visible changes, especially the changes in
3175 wcwidth for many emoji characters cause problems when emoji sequences
3176 are rendered with pango, see for example:
3177 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3179 * Collation of Hungarian has been overhauled and is now consistent with "The
3180 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3183 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3185 - The GNU C Library will now detect when /etc/resolv.conf has been
3186 modified and reload the changed configuration. The new resolver option
3187 “no-reload” (RES_NORELOAD) disables this behavior.
3189 - The GNU C Library now supports an arbitrary number of search domains
3190 (configured using the “search” directive in /etc/resolv.conf);
3191 previously, there was a hard limit of six domains. For backward
3192 compatibility, applications that directly modify the ‘_res’ global
3193 object are still limited to six search domains.
3195 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3196 Library will now randomly pick a name server from the configuration as a
3197 starting point. (Previously, the second name server was always used.)
3199 * The tunables feature is now enabled by default. This allows users to tweak
3200 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3202 * New function reallocarray, which resizes an allocated block (like realloc)
3203 to the product of two sizes, with a guaranteed clean failure upon integer
3204 overflow in the multiplication. Originally from OpenBSD, contributed by
3205 Dennis Wölfing and Rüdiger Sonderfeld.
3207 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3208 These are extended versions of preadv and pwritev, respectively, taking an
3209 additional flags argument. The set of supported flags depends on the
3210 running kernel; full support currently requires kernel 4.7 or later.
3212 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3213 create a new session ID for the spawned process. This feature is
3214 scheduled to be added to the next major revision of POSIX; for the time
3215 being, it is available under _GNU_SOURCE.
3217 * errno.h is now safe to use from C-preprocessed assembly language on all
3218 supported operating systems. In this context, it will only define the
3219 Exxxx constants, as preprocessor macros expanding to integer literals.
3221 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3222 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3223 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3224 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3226 To compile programs that use this feature, the compiler must support
3227 128-bit floating point with the type name _Float128 (as defined by TS
3228 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3229 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3230 must be defined to make the new interfaces visible.
3232 The new functions and macros correspond to those present for other
3233 floating-point types (except for a few obsolescent interfaces not
3234 supported for the new type), with F128 or f128 suffixes; for example,
3235 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3236 printf or scanf formats for the new type; the strfromf128 and strtof128
3237 interfaces should be used instead.
3239 Deprecated and removed features, and other changes affecting compatibility:
3241 * The synchronization that pthread_spin_unlock performs has been changed to
3242 now be equivalent to a C11 atomic store with release memory order to the
3243 spin lock's memory location. Previously, several (but not all)
3244 architectures used stronger synchronization (e.g., containing what is
3245 often called a full barrier). This change can improve performance, but
3246 may affect odd fringe uses of spin locks that depend on the previous
3247 behavior (e.g., using spin locks as atomic variables to try to implement
3248 Dekker's mutual exclusion algorithm).
3250 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3253 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3254 will only be built and installed when the GNU C Library is configured with
3255 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3256 as TIRPC or rpcsvc-proto, to be used.
3258 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3259 libnss_compat, are deprecated, and will not be built or installed by
3262 The NIS(+) support library, libnsl, is also deprecated. By default, a
3263 compatibility shared library will be built and installed, but not headers
3264 or development libraries. Only a few NIS-related programs require this
3265 library. (In particular, the GNU C Library has never required programs
3266 that use 'gethostbyname' to be linked with libnsl.)
3268 Replacement implementations based on TIRPC, which additionally support
3269 IPv6, are available from <https://github.com/thkukuk/>. The configure
3270 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3271 name service modules, to be built and installed.
3273 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3274 support is enabled, the configured recursive resolver must support EDNS.
3275 (Responding to EDNS-enabled queries with responses which are not
3276 EDNS-enabled is fine, but FORMERR responses are not.)
3278 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3279 servers have not supported this opcode for a long time.
3281 * The _res_opcodes variable has been removed from libresolv. It had been
3282 exported by accident.
3284 * <string.h> no longer includes inline versions of any string functions,
3285 as this kind of optimization is better done by the compiler. The macros
3286 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3288 * The nonstandard header <xlocale.h> has been removed. Most programs should
3289 use <locale.h> instead. If you have a specific need for the definition of
3290 locale_t with no other declarations, please contact
3291 libc-alpha@sourceware.org and explain.
3293 * The obsolete header <sys/ultrasound.h> has been removed.
3295 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3297 * The obsolete function cfree has been removed. Applications should use
3300 * The stack_t type no longer has the name struct sigaltstack. This changes
3301 the C++ name mangling for interfaces involving this type.
3303 * The ucontext_t type no longer has the name struct ucontext. This changes
3304 the C++ name mangling for interfaces involving this type.
3306 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3307 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3308 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3309 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3310 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3311 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3312 fpregset_t type no longer has the name struct fpu. This changes the C++
3313 name mangling for interfaces involving those types.
3315 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3316 synced with the kernel:
3318 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3319 are not supported on this architecture and have been removed.
3321 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3322 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3323 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3325 Programs that assume the GET/SETREGS ptrace requests are universally
3326 available will now fail to build, instead of malfunctioning at runtime.
3328 Changes to build and runtime requirements:
3330 * Linux kernel 3.2 or later is required at runtime, on all architectures
3331 supported by that kernel. (This is a change from version 2.25 only for
3334 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3336 * On most architectures, GCC 4.9 or later is required to build the GNU C
3337 Library. On powerpc64le, GCC 6.2 or later is required.
3339 Older GCC versions and non-GNU compilers are still supported when
3340 compiling programs that use the GNU C Library. (We do not know exactly
3341 how old, and some GNU extensions to C may be _de facto_ required. If you
3342 are interested in helping us make this statement less vague, please
3343 contact libc-alpha@sourceware.org.)
3345 Security related changes:
3347 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3348 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3350 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3351 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3353 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3354 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3357 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3358 fixed (CVE-2017-12133).
3360 The following bugs are resolved with this release:
3362 [984] network: Respond to changed resolv.conf in gethostbyname
3363 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3364 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3366 [12189] libc: __stack_chk_fail should not attempt a backtrace
3368 [14096] time: Race condition on timezone/tst-timezone.out
3369 [14172] localedata: az_IR: new locale
3370 [14995] build: glibc fails to build if gold is the default linker, even if
3372 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3373 [16637] network: inet_pton function is accepting IPv6 with bad format
3374 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3375 x86 and other generic code
3376 [16875] localedata: ko_KR: fix lang_name
3377 [17225] localedata: ar_SY: localized month names for May and June are
3379 [17297] localedata: da_DK: wrong date_fmt string
3380 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3381 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3382 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3383 [19066] localedata: ar_SA abbreviated day and month names are in English
3384 [19569] network: resolv: Support an arbitrary number of search domains
3385 [19570] network: Implement random DNS server selection in the stub
3387 [19838] locale: localedef fails on PA-RISC
3388 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3389 order of 0D36 and 0D37
3390 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3392 [20098] libc: FAIL: debug/backtrace-tst on hppa
3393 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3395 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3397 [20313] localedata: Update locale data to Unicode 9.0
3398 [20424] manual: Document how to provide a malloc replacement
3399 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3401 [20686] locale: Add el_GR@euro to SUPPORTED.
3402 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3403 failures consistently
3404 [21015] dynamic-link: Document and fix --enable-bind-now
3405 [21016] nptl: pthread_cond support is broken on hppa
3406 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3407 frame-pointer on i386
3408 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3410 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
3411 [21088] libc: Build fails with --enable-static-nss
3412 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3413 generic c code is used
3414 [21109] libc: Tunables broken on big-endian
3415 [21112] math: powf has large ulp errors with base close to 1 and exponent
3417 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3419 [21120] malloc: glibc malloc is incompatible with GCC 7
3420 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3422 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3423 (-0.0) when linking with -lieee
3424 [21171] math: log10, log2 and lgamma return incorrect results
3425 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3426 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3427 [21207] localedata: ce_RU: update weekdays from CLDR
3428 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3429 [21217] localedata: Update months from CLDR-31
3430 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3431 [21243] libc: support_delete_temp_file should issue warning for failed
3433 [21244] libc: support resolv_test_start() socket fd close should be
3435 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3436 new posix_spawn implementation
3437 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3438 leads to lower CPU frequency
3439 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3440 [21261] libc: [sparc64] bits/setjmp.h namespace
3441 [21267] network: [mips] bits/socket.h IOC* namespace
3442 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3443 [21270] libc: mmap64 silently truncates large offset values
3444 [21275] libc: posix_spawn always crashes on ia64 now
3445 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3446 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3447 [21289] libc: Incorrect declaration for 32-bit platforms with
3448 _FILE_OFFSET_BITS=64 causes build error
3449 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3450 not support gethostbyname4_r
3451 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3453 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3455 [21340] libc: Support POSIX_SPAWN_SETSID
3456 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3457 [21359] network: ns_name_pack needs additional byte in destination buffer
3458 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3459 against fragmentation attacks (CVE-2017-12132)
3460 [21369] network: resolv: Remove EDNS fallback
3461 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3463 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3464 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3465 [21393] stdio: Missing dup3 error check in freopen, freopen64
3466 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3467 [21399] localedata: Bad description for U00EC in
3468 localedata/charmaps/CP1254
3469 [21411] malloc: realloc documentation error
3470 [21426] network: sys/socket.h uio.h namespace
3471 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3472 [21445] libc: signal.h bsd_signal namespace
3473 [21455] network: Network headers stdint.h namespace
3474 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3476 [21475] network: resolv: Overlong search path is truncated mid-label
3477 [21511] libc: sigstack namespace
3478 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3479 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3480 bits/syscall.h: No such file or directory
3481 [21517] libc: struct sigaltstack namespace
3482 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3483 [21533] localedata: Update locale data to Unicode 10.0
3485 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3486 junk at end of line, first unrecognized character is `@'
3487 [21538] libc: SIG_HOLD missing for XPG4
3488 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3489 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3490 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3491 [21543] libc: sigevent namespace
3492 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3493 size for general purpose registers in mcontext_t structure
3494 [21550] libc: sigwait namespace
3495 [21552] libc: XPG4 bsd_signal namespace
3496 [21554] libc: sigpause namespace
3497 [21560] libc: sys/wait.h signal.h namespace
3498 [21561] libc: waitid namespace
3499 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3500 '/usr/include/stdlib.h': Permission denied
3501 [21575] libc: sys/wait.h missing struct rusage definition
3502 [21584] libc: sigaltstack etc namespace
3503 [21597] libc: siginterrupt namespace
3504 [21607] math: hppa: FAIL: math/test-tgmath
3505 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3507 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3508 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3509 stack and heap (CVE-2017-1000366)
3510 [21625] libc: wait3 namespace
3511 [21654] nss: Incorrect pointer alignment in NSS group merge result
3513 [21657] network: Parse interface zone id for node-local multicast
3514 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3516 [21666] libc: .symver is used on common symbol
3517 [21668] network: resolv: res_init cross-thread broadcast introduces race
3519 [21687] math: tgmath.h totalorder, totalordermag return type
3520 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3522 [21696] libc: Incorrect assumption of of __cpu_mask in
3523 posix/sched_cpucount.c
3524 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3525 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3527 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3528 leading to relocation crash
3529 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3530 `resolv_conf_matches (resp, conf)' failed.
3531 [21710] localedata: Added Samoan language locale for Samoa
3532 [21711] localedata: Pashto yesstr/nostr locale are missing
3533 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3534 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3535 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3536 [21723] localedata: yesstr/nostr missing for Chinese language locale
3537 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3539 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3541 [21728] localedata: New Locale for Tongan language
3542 [21729] localedata: incorrect LC_NAME fields for hi_IN
3543 [21733] localedata: yesstr and nostr are missing for zh_HK
3544 [21734] localedata: Missing yesstr and nostr are for kw_GB
3545 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3546 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3547 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3548 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3550 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3552 [21749] localedata: Wrong abbreviated day name (“abday”) for
3554 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3555 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3556 [21759] localedata: missing yesstr and nostr for Tigrinya
3557 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3558 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3559 [21767] localedata: Missing Bislama locales
3560 [21768] localedata: Missing yesstr and nostr for aa_ET
3561 [21770] localedata: Missing Field in li_NL
3562 [21778] nptl: Robust mutex may deadlock
3563 [21779] libc: MicroBlaze segfaults when loading libpthread
3564 [21783] localedata: Fix int_select international_call_prefixes
3565 [21784] localedata: Inconsistency in country_isbn
3566 [21788] localedata: Missing Country Postal Abbreviations
3567 [21794] localedata: Added-country_isbn-for-Italy
3568 [21795] localedata: Add/Fix country_isbn for France
3569 [21796] localedata: Added country_isbn for Republic of Korea
3570 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3571 [21799] localedata: Added int_select international_call_prefixes
3572 [21801] localedata: Added int_select international_call_prefixes
3573 [21804] nptl: Double semicolon in thread-shared-types.h
3574 [21807] localedata: LC_ADDRESS fix for pap_CW
3575 [21808] localedata: Fix LC_ADDRESS for pap_AW
3576 [21821] localedata: Added country_name in mai_IN
3577 [21822] localedata: Fix LC_TIME for mai_IN
3578 [21823] localedata: missing yesstr, nostr for sa_IN
3579 [21825] localedata: Fix name_mrs for mag_IN
3580 [21828] localedata: 2.26 changelog should mention user visible changes
3582 [21835] localedata: Added Maithili language locale for Nepal
3583 [21838] localedata: Removed redundant data for the_NP
3584 [21839] localedata: Fix LC_MONETARY for ta_LK
3585 [21844] localedata: Fix Latin characters and Months Sequence.
3586 [21848] localedata: Fix mai_NP Title Name
3591 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3592 24731-2:2010, is supported to enable declarations of functions from that
3593 TR. Note that not all functions from that TR are supported by the GNU C
3596 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3597 18661-1:2014, is supported to enable declarations of functions and macros
3598 from that TS. Note that not all features from that TS are supported by
3601 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3602 18661-4:2015, is supported to enable declarations of functions and macros
3603 from that TS. Note that most features from that TS are not supported by
3606 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3607 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3608 Since the GNU C Library defaults to a much newer revision of POSIX, this
3609 will only affect programs that specifically request an old conformance
3610 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3611 see a change in the visible declarations, but a program compiled with
3612 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3615 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3616 defined by all multithreaded code, but glibc has not required this for
3619 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3620 means that in a future release, the macros “major”, “minor”, and “makedev”
3621 will only be available from <sys/sysmacros.h>.
3623 These macros are not part of POSIX nor XSI, and their names frequently
3624 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3625 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3626 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3629 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3630 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3631 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3633 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3634 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3635 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3636 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3637 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3638 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3639 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3640 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3641 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3642 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3643 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3646 * New <math.h> features are added from TS 18661-1:2014:
3648 - Signaling NaN macros: SNANF, SNAN, SNANL.
3650 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3651 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3652 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3654 - llogb functions: the llogb, llogbf and llogbl functions, and the
3655 FP_LLOGB0 and FP_LLOGBNAN macros.
3657 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3660 - Comparison macros: iseqsig.
3662 - Classification macros: iscanonical, issubnormal, iszero.
3664 - Total order functions: totalorder, totalorderf, totalorderl,
3665 totalordermag, totalordermagf, totalordermagl.
3667 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3669 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3670 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3672 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3673 are added to libc. They convert a floating-point number into string.
3675 * Most of glibc can now be built with the stack smashing protector enabled.
3676 It is recommended to build glibc with --enable-stack-protector=strong.
3677 Implemented by Nick Alcock (Oracle).
3679 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3680 intended to be used instead of memset() to erase sensitive data after use;
3681 the compiler will not optimize out calls to explicit_bzero even if they
3682 are "unnecessary" (in the sense that no _correct_ program can observe the
3683 effects of the memory clear).
3685 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3686 to float instead of double. This does not affect the ABI of any libraries
3687 that are part of the GNU C Library, but may affect the ABI of other
3688 libraries that use this type in their interfaces.
3690 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3691 float_t and double_t types are now defined to long double instead of float
3692 and double. These options are not the default, and this does not affect
3693 the ABI of any libraries that are part of the GNU C Library, but it may
3694 affect the ABI of other libraries that use this type in their interfaces,
3695 if they are compiled or used with those options.
3697 * The getentropy and getrandom functions, and the <sys/random.h> header file
3700 * The buffer size for byte-oriented stdio streams is now limited to 8192
3701 bytes by default. Previously, on Linux, the default buffer size on most
3702 file systems was 4096 bytes (and thus remains unchanged), except on
3703 network file systems, where the buffer size was unpredictable and could be
3704 as large as several megabytes.
3706 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3707 for the Linux quota interface which predates kernel version 2.4.22 has
3710 * The malloc_get_state and malloc_set_state functions have been removed.
3711 Already-existing binaries that dynamically link to these functions will
3712 get a hidden implementation in which malloc_get_state is a stub. As far
3713 as we know, these functions are used only by GNU Emacs and this change
3714 will not adversely affect already-built Emacs executables. Any undumped
3715 Emacs executables, which normally exist only during an Emacs build, should
3716 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3718 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3719 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3720 “no-ip6-dotint” had already been the default, and support for the
3721 “ip6-dotint” option was removed from the Internet in 2006.
3723 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3724 flag from <resolv.h> have been removed. The option relied on a
3725 backwards-incompatible DNS extension which was never deployed on the
3728 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3729 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3730 They were already unimplemented.
3732 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3733 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3734 removed again from the IETF name lookup interface specification in RFC
3735 2553. Applications should use getaddrinfo instead.
3737 * DNSSEC-related declarations and definitions have been removed from the
3738 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3739 decode the data part of DNSSEC record types. Previous versions of glibc
3740 only implemented minimal support for the previous version of DNSSEC, which
3741 is incompatible with the currently deployed version.
3743 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3744 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3745 <arpa/nameser.h> header file because the distinction between RR types and
3746 meta-RR types is not officially standardized, subject to revision, and
3747 thus not suitable for encoding in a macro.
3749 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3750 and rhook members of the res_state type in <resolv.h> have been removed.
3751 The glibc stub resolver did not support these hooks, but the header file
3752 did not reflect that.
3754 * For multi-arch support it is recommended to use a GCC which has
3755 been built with support for GNU indirect functions. This ensures
3756 that correct debugging information is generated for functions
3757 selected by IFUNC resolvers. This support can either be enabled by
3758 configuring GCC with '--enable-gnu-indirect-function', or by
3759 enabling it by default by setting 'default_gnu_indirect_function'
3760 variable for a particular architecture in the GCC source file
3763 * GDB pretty printers have been added for mutex and condition variable
3764 structures in POSIX Threads. When installed and loaded in gdb these pretty
3765 printers show various pthread variables in human-readable form when read
3766 using the 'print' or 'display' commands in gdb.
3768 * Tunables feature added to allow tweaking of the runtime for an application
3769 program. This feature can be enabled with the '--enable-tunables' configure
3770 flag. The GNU C Library manual has details on usage and README.tunables has
3771 instructions on adding new tunables to the library.
3773 * A new version of condition variables functions have been implemented in
3774 the NPTL implementation of POSIX Threads to provide stronger ordering
3777 * A new version of pthread_rwlock functions have been implemented to use a more
3778 scalable algorithm primarily through not using a critical section anymore to
3781 Security related changes:
3783 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3784 have been created with makecontext could fail to terminate due to a
3785 missing .cantunwind annotation. This has been observed to lead to a hang
3786 (denial of service) in some Go applications compiled with gccgo. Reported
3787 by Andreas Schwab. (CVE-2016-6323)
3789 * The DNS stub resolver functions would crash due to a NULL pointer
3790 dereference when processing a query with a valid DNS question type which
3791 was used internally in the implementation. The stub resolver now uses a
3792 question type which is outside the range of valid question type values.
3795 The following bugs are resolved with this release:
3797 [4099] stdio: Overly aggressive caching by stream i/o functions.
3798 [7065] build: Support building glibc with -fstack-protector or -fstack-
3800 [9842] localedata: en_CA: incorrect date format
3801 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3802 before it started waiting
3803 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3804 [15765] nptl: sem_open is wrongly a cancellation point
3805 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3806 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3808 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3809 library linked with pthread
3810 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3811 "FIXME: Ingo" issue)
3812 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3813 [17252] libc: getrandom and getentropy syscall
3814 [17730] malloc: thread-local storage is sometimes improperly free()'d
3815 after being __libc_memalign()'d
3816 [18241] stdio: failed fseek on memstream does not set errno and can fail
3818 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3820 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3821 PTHREAD_PRIO_INHERIT mutex on ARM
3822 [18784] network: res_query and related function crash for special record
3823 type queries (CVE-2015-5180)
3824 [19380] math: strtod does not raise "inexact"
3825 [19387] string: Integer overflow in memchr
3826 [19390] string: Integer overflow in strncat
3827 [19398] build: linknamespace tests fail with massively parallel build
3828 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3830 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3831 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3832 [19514] libc: [PATCH] Fix spelling errors in spelling
3833 "implement"/"implementation" in several places
3834 [19582] network: Deprecate RES_USE_INET6
3835 [19673] manual: clog10 docs appear to be erroneous
3836 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3837 causes a segmentation fault
3838 [19826] libc: invalid pointer returned from __tls_get_addr with static
3840 [20016] network: resolv: Remove hooks support from the API
3841 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3843 [20033] math: [x86_64] vectorized math function don't call the __finite
3845 [20116] nptl: use after free in pthread_create
3846 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3847 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3849 [20311] nptl: please install proc_service.h
3850 [20366] libc: Compilation errors in installed headers in strict-compliance
3852 [20370] malloc: malloc: Arena free list management is still racy
3853 (incorrect fix in bug 19243)
3854 [20386] libc: assert (X = 0) does not result in GCC warning
3855 [20432] malloc: malloc: Minimize interface required for interposition
3856 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3857 in _Unwind_Backtrace (CVE-2016-6323)
3858 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3859 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3861 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3862 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3863 [20477] network: resolv: incorrect double-checked locking related to
3865 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3867 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3869 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3870 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3871 cause transition penalty
3872 [20517] math: sparcv9 missing fdiml compat symbol
3873 [20524] manual: strverscmp is inconsistent
3874 [20525] libc: <sys/quota.h> should be based on kernel headers
3875 [20539] math: GCC 7 -static -lm fails to link at -O3
3876 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3878 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3880 [20591] network: Remove obsolete DNSSEC support
3881 [20592] network: DNS resource record type classification macros in
3882 <arpa/nameser.h> are incorrect
3883 [20593] network: Update DNS RR type definitions
3884 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3885 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3887 [20629] network: libresolv: Remove support for bitstring labels
3889 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3890 assertion: "maxidx >= 2"
3891 [20660] math: [arm] Use VSQRT
3892 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3893 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3894 [20689] libc: Test for FMA should also check for AVX.
3895 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3896 [20715] math: iszero macro breaks existing code
3897 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3898 [20728] libc: powerpc: Missing TOC stub in clone
3899 [20729] build: glibc-2.24 fails to build for i486 with -Os
3900 [20750] build: Build fails with default PIE enabled gcc-6.x
3901 [20768] math: [alpha] sqrt fegetenv namespace
3902 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3904 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3905 __FLT_EVAL_METHOD__ is 2
3906 [20790] network: rpcgen buffer overrun in get_prog_declaration
3907 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3908 [20829] libc: crypt snprintf namespace
3909 [20847] libc: tst-vfork3 failure
3910 [20855] math: Default bits/mathdef.h has inappropriate float_t
3911 [20859] math: [sh4] FP_ILOGB0 invalid
3912 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3913 U+20AC), not same as GBK
3914 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3915 [20916] math: pow handling of sNaN arguments
3916 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3917 [20919] math: Bad pow (qNaN, 0) result with -lieee
3918 [20940] math: hypot sNaN handling
3919 [20947] math: fmax, fmin sNaN handling
3920 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3921 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3923 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3924 [20973] nptl: robust mutexes: Lost wake-ups
3925 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3926 [20978] nis: strlen on null pointer in nss_nisplus
3927 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3929 [21014] string: i686 memchr overflows internal pointer check
3930 [21019] libc: [mips] n32 lseek incorrect on overflow
3931 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3932 [21026] libc: [MIPS] readahead syscall is broken on n64
3933 [21028] math: Fallback fesetexceptflag should always succeed
3934 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3935 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3937 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3938 [21061] librt: [microblaze] librt lost clock_* exports
3939 [21073] libc: tunables: insecure environment variables passed to
3940 subprocesses with AT_SECURE
3941 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3945 * The minimum Linux kernel version that this version of the GNU C Library
3946 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3947 kernel version 2.6.32 or later suffices (on architectures that already
3948 required kernel versions more recent than 3.2, those requirements remain
3949 unchanged). Linux 3.2 or later kernel headers are required on all
3952 * The pap_AN locale has been deleted. This has been deprecated for a long
3953 time. It has been replaced by pap_AW & pap_CW, both of which have long
3954 been included in previous releases.
3956 * The readdir_r and readdir64_r functions have been deprecated. It is
3957 recommended to use readdir and readdir64 instead.
3959 * The type “union wait” has been removed. It was deprecated in the early
3960 1990s and never part of POSIX. Application code should use the int type
3961 instead of “union wait”.
3963 * A new NSS action is added to facilitate large distributed system
3964 administration. The action, MERGE, allows remote user stores like LDAP
3965 to be merged into local user stores like /etc/groups in order to provide
3966 easy to use, updated, and managed sets of merged credentials. The new
3967 action can be used by configuring it in /etc/nsswitch.conf:
3968 group: files [SUCCESS=merge] nis
3969 Implemented by Stephen Gallagher (Red Hat).
3971 * The deprecated __malloc_initialize_hook variable has been removed from the
3974 * The long unused localedef --old-style option has been removed. It hasn't
3975 done anything in over 16 years. Scripts using this option can safely
3978 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3979 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3980 return the next representable value in the direction of positive infinity
3981 and the nextdown functions return the next representable value in the
3982 direction of negative infinity. These are currently enabled as GNU
3985 Security related changes:
3987 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3988 could result in a stack overflow when getnetbyname was called with an
3989 overly long name. (CVE-2016-3075)
3991 * Previously, getaddrinfo copied large amounts of address data to the stack,
3992 even after the fix for CVE-2013-4458 has been applied, potentially
3993 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3994 instead. Reported by Michael Petlan. (CVE-2016-3706)
3996 * The glob function suffered from a stack-based buffer overflow when it was
3997 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3998 Reported by Alexander Cherepanov. (CVE-2016-1234)
4000 * The Sun RPC UDP client could exhaust all available stack space when
4001 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
4002 alloca plugin for GCC. (CVE-2016-4429)
4004 * The IPv6 name server management code in libresolv could result in a memory
4005 leak for each thread which is created, performs a failing naming lookup,
4006 and exits. Over time, this could result in a denial of service due to
4007 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
4009 The following bugs are resolved with this release:
4011 [1170] localedata: ne_NP: update Nepali locale definition file
4012 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
4014 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
4015 [6796] math: fdim() does not set errno on overflow
4016 [10354] libc: posix_spawn should use vfork() in more cases than presently
4017 [11213] localedata: localedata: add copyright disclaimer to locale files
4018 [12143] localedata: chr_US: new Cherokee locale
4019 [12450] localedata: sgs_LT: new locale
4020 [12676] localedata: ln_CD: new locale
4021 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
4023 [13304] math: fma, fmaf, fmal produce wrong results
4024 [14259] build: --localedir arg to configure is ignored
4025 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
4026 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
4027 [14934] localedata: es_CL: wrong first weekday chilean locale
4028 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
4030 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
4032 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
4033 [15368] nptl: raise() is not async-signal-safe
4034 [15479] math: ceil, floor, round and trunc raise inexact exception
4035 [15578] localedata: kk_KZ: various updates
4036 [16003] localedata: pap_AN: punt old locale
4037 [16137] localedata: iw_IL: punt old locale
4038 [16190] localedata: eo: new esperanto locale
4039 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
4040 [16742] malloc: race condition: pthread_atfork() called before first
4041 malloc() results in unexpected locking behaviour/deadlocks
4042 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
4044 [16983] localedata: postal_fmt does not allow %l and %n modifiers
4045 [17565] localedata: pt_PT: wrong (work-)week start
4046 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
4047 [17950] build: Build fails with -msse
4048 [18205] localedata: be_BY*: wrong first_weekday and first_workday
4049 [18433] libc: posix_spawn does not return correctly upon failure to
4051 [18453] localedata: charmaps/IBM875: incorrect codes
4052 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
4054 [18896] localedata: he_IL: improvements for currency
4055 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
4056 Romanian locale data
4057 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
4059 [19056] libc: Deprecate readdir_r
4060 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
4062 [19198] localedata: nl_NL: small improvements for Dutch locales
4063 [19257] network: Per-thread memory leak in __res_vinit with IPv6
4064 nameservers (CVE-2016-5417)
4065 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
4067 [19400] locale: Language missing in "iso-639.def", trivial fix in
4069 [19431] malloc: Deadlock between fflush, getdelim, and fork
4070 [19505] libc: Incorrect file descriptor validity checks in
4071 posix_spawn_file_actions_add{open,close,dup2}
4072 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
4073 when using RTLD_NEXT
4074 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
4075 `intl/{gettextP,loadinfo}.h'
4076 [19534] libc: execle, execlp may use malloc
4077 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
4078 [19573] network: res_nclose and __res_maybe_init disagree about name
4079 server initialization, breaking Hesiod
4080 [19575] localedata: Status of GB18030 tables
4081 [19581] localedata: sr_* date_fmt string contains additional newline
4082 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
4084 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
4085 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
4086 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
4087 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
4089 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
4091 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
4093 [19610] dynamic-link: ldconfig -X removes stale symbolic links
4094 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
4095 [19633] locale: strfmon_l applies global locale to number formatting
4096 [19642] network: Memory leak in getnameinfo
4097 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
4098 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
4100 [19654] math: [x86_64] Need testcase for BZ #19590 fix
4101 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
4103 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
4104 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
4106 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
4108 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
4110 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
4111 pointers and lengths in error-case.
4112 [19727] locale: Converting from/to UTF-xx with iconv() does not always
4113 report errors on UTF-16 surrogates values.
4114 [19755] nscd: nscd assertion failure in gc
4115 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
4116 [19759] libc: mempcpy shouldn't be inlined
4117 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
4118 [19765] libc: s390 needs an optimized mempcpy
4119 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
4120 NAME_MAX limit assumption (CVE-2016-1234)
4121 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
4122 [19787] network: Missing and incorrect truncation checks in getnameinfo
4123 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
4125 [19791] network: Assertion failure in res_query.c with un-connectable name
4127 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
4128 [19822] math: libm.so install clobbers old version
4129 [19825] network: resolv: send_vc can return uninitialized data in second
4130 response to getaddrinfo
4131 [19830] network: nss_dns: should check RDATA length against buffer length
4132 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
4133 confronted with A/AAAA records of invalid size
4134 [19837] nss: nss_db: No retries for some long lines with a larger buffer
4135 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
4136 [19853] stdio: Printing IBM long double in decimal with high precision is
4138 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
4139 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
4140 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
4142 [19865] network: Assertion failure or memory leak in
4143 _nss_dns_getcanonname_r
4144 [19868] network: nss_dns: netent code does not skip over non-PTR records
4145 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4147 [19881] string: Improve x86-64 memset
4148 [19907] string: Incorrect memcpy tests
4149 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4151 [19925] libc: termios.h XCASE namespace
4152 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4153 [19929] libc: limits.h NL_NMAX namespace
4154 [19931] stdio: Memory leak in vfprintf
4155 [19957] libc: clone(CLONE_VM) access invalid parent memory
4156 [19963] localedata: en_IL: New locale
4157 [19989] stdio: stdio.h cuserid namespace
4158 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4160 [19996] locale: langinfo.h nl_langinfo_l namespace
4161 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4162 [20010] network: getaddrinfo: Stack overflow in hostent translation
4164 [20012] stdio: libio: fmemopen append mode failure
4165 [20014] stdio: stdio.h namespace for pre-threads POSIX
4166 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4167 [20023] libc: fcntl.h timespec namespace
4168 [20024] math: [x86_64] vectorized sincos trashes the stack
4169 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4170 [20041] time: sys/time.h timespec namespace
4171 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4172 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4173 [20051] libc: ttyslot in wrong header under wrong conditions
4174 [20054] libc: gethostname not declared for XPG4
4175 [20055] libc: termios.h missing tcgetsid for XPG4
4176 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4178 [20073] libc: sys/stat.h fchmod namespace
4179 [20074] libc: stdlib.h rand_r namespace
4180 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4181 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4183 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4184 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4186 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4187 [20119] libc: Wrong mask for processors level type from CPUID
4188 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4189 AS not supporting AVX512
4190 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4192 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4193 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4195 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4196 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4197 [20178] libc: posix_spawn{p} should not call exit
4198 [20191] stdio: libio: vtables hardening
4199 [20195] string: FMA4 detection requires CPUID execution with register
4201 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4202 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4204 [20212] math: acos (sNaN) returns sNaN
4205 [20213] math: asin (sNaN) returns sNaN
4206 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4207 [20218] math: [i386] asinhl (sNaN) returns sNaN
4208 [20219] math: [i386] atanhl (sNaN) returns sNaN
4209 [20222] stdio: fopencookie: Mangle function pointers
4210 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4211 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4212 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4214 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4215 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4216 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4217 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4218 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4219 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4220 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4221 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4222 [20240] math: modf (sNaN) returns sNaN
4223 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4224 [20250] math: frexp (sNaN) returns sNaN
4225 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4226 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4228 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4229 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4230 subscript is below array bounds [-Werror=array-bounds]
4231 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4232 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4234 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4235 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4237 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4238 "invalid" exceptions
4239 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4240 [20316] localedata: id_ID: Februari instead of Pebruari
4241 [20327] string: POWER8 strcasecmp returns incorrect result
4242 [20347] math: Failure: Test: j0_downward (0xap+0)
4243 [20348] libc: FAIL: misc/tst-preadvwritev64
4244 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4245 [20350] libc: There is no test for p{read,write}64
4246 [20357] math: Incorrect cos result for 1.5174239687223976
4247 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4251 * Unicode 8.0.0 Support: Character encoding, character type info, and
4252 transliteration tables are all updated to Unicode 8.0.0, using new
4253 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4254 These updates cause user visible changes, such as the fixes for bugs
4255 89, 16061, and 18568.
4257 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4258 kernel-internal CPU set size. This means that requests that change the
4259 CPU affinity which failed before (for example, an all-ones CPU mask) will
4260 now succeed. Applications that need to determine the effective CPU
4261 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4262 setting it because the kernel can adjust it (and the previous size check
4263 would not detect this in the majority of cases).
4265 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4266 the following new symbols are used: fts64_children, fts64_close,
4267 fts64_open, fts64_read and fts64_set.
4269 * getaddrinfo now detects certain invalid responses on an internal netlink
4270 socket. If such responses are received, an affected process will
4271 terminate with an error message of "Unexpected error <number> on netlink
4272 descriptor <number>" or "Unexpected netlink response of size <number> on
4273 descriptor <number>". The most likely cause for these errors is a
4274 multi-threaded application which erroneously closes and reuses the netlink
4275 file descriptor while it is used by getaddrinfo.
4277 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4278 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4279 unnecessary serialization of memory allocation requests across threads.
4280 The defect is now corrected. Users should see a substantial increase in
4281 the concurent throughput of allocation requests for applications which
4282 trigger this bug. Affected applications typically create and
4283 destroy threads frequently. (Bug 19048 was reported and analyzed by
4286 * There is now a --disable-timezone-tools configure option for disabling the
4287 building and installing of the timezone related utilities (zic, zdump, and
4288 tzselect). This is useful for people who build the timezone data and code
4289 independent of the GNU C Library.
4291 * The obsolete header <regexp.h> has been removed. Programs that require
4292 this header must be updated to use <regex.h> instead.
4294 * The obsolete functions bdflush, create_module, get_kernel_syms,
4295 query_module and uselib are no longer available to newly linked binaries;
4296 the header <sys/kdaemon.h> has been removed. These functions and header
4297 were specific to systems using the Linux kernel and could not usefully be
4298 used with the GNU C Library on systems with version 2.6 or later of the
4301 * Optimized string, wcsmbs and memory functions for IBM z13.
4302 Implemented by Stefan Liebler.
4304 * Newly linked programs that define a variable called signgam will no longer
4305 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4306 require signgam to be set by those functions must ensure that they use the
4307 variable provided by the GNU C Library and declared in <math.h>, without
4308 defining their own copy.
4310 * The minimum GCC version that can be used to build this version of the GNU
4311 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4312 still be used to compile programs using the GNU C Library.
4314 Security related changes:
4316 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4317 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4319 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4320 the pointer guard feature. It is always enabled. Previously,
4321 LD_POINTER_GUARD could be used to disable security hardening in binaries
4322 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4325 * An integer overflow in hcreate and hcreate_r could lead to an
4326 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4328 * The catopen function no longer has unbounded stack usage. Reported by
4329 Max. (CVE-2015-8779)
4331 * The nan, nanf and nanl functions no longer have unbounded stack usage
4332 depending on the length of the string passed as an argument to the
4333 functions. Reported by Joseph Myers. (CVE-2014-9761)
4335 * A stack-based buffer overflow was found in libresolv when invoked from
4336 libnss_dns, allowing specially crafted DNS responses to seize control
4337 of execution flow in the DNS client. The buffer overflow occurs in
4338 the functions send_dg (send datagram) and send_vc (send TCP) for the
4339 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4340 family. The use of AF_UNSPEC triggers the low-level resolver code to
4341 send out two parallel queries for A and AAAA. A mismanagement of the
4342 buffers used for those queries could result in the response of a query
4343 writing beyond the alloca allocated buffer created by
4344 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4345 the overflow. Thanks to the Google Security Team and Red Hat for
4346 reporting the security impact of this issue, and Robert Holiday of
4347 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4349 The following bugs are resolved with this release:
4351 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4352 [887] math: Math library function "logb" and "nextafter" inconsistent
4353 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4354 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4355 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4356 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4358 [4404] localedata: German translation of "Alarm clock" is misleading
4359 [6799] math: nextafter() and nexttoward() doen't set errno on
4360 overflow/underflow errors
4361 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4363 [10432] nis: _nss_nis_setnetgrent assertion failure
4364 [11460] libc: fts has no LFS support
4365 [12926] network: getaddrinfo()/make_request() may spin forever
4366 [13065] nptl: Race condition in pthread barriers
4367 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4368 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4370 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4371 [14912] libc: Rename non-installed bits/*.h headers
4372 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4373 [15367] math: Let gcc use __builtin_isinf
4374 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4375 [15421] math: lgamma wrongly sets signgam for ISO C
4376 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4377 FE_INVALID with argument out of range
4378 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4380 [15786] dynamic-link: ifunc resolver functions can smash function
4382 [15918] math: Unnecessary check for equality in hypotf()
4383 [16061] localedata: Review / update transliteration data
4384 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4386 [16141] time: strptime %z offset restriction
4387 [16171] math: drem should be alias of remainder
4388 [16296] math: fegetround is pure?
4389 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4390 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4392 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4393 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4395 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4396 "Exception "Inexact" set" on ppc32
4397 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4398 [16517] math: Missing underflow exception from tanf/tan/tanl
4399 [16519] math: Missing underflow exception from sinhf
4400 [16520] math: Missing underflow exception from tanhf
4401 [16521] math: Missing underflow exception from exp2
4402 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4404 [16734] stdio: fopen calls mmap to allocate its buffer
4405 [16961] math: nan function incorrect handling of bad sequences
4406 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4407 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4408 [16985] locale: localedef: confusing error message when opening output
4410 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4411 [17197] locale: Redundant shift character in iconv conversion output at
4413 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4414 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4415 [17250] dynamic-link: static linking breaks nss loading
4416 (getaddrinfo/getpwnam/etc...)
4417 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4419 [17441] math: isnan() should use __builtin_isnan() in GCC
4420 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4421 (related to lock elision)
4422 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4423 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4424 [17887] time: strptime should be able to parse "+01:00" style timezones
4425 [17905] libc: catopen() Multiple unbounded stack allocations
4427 [18084] libc: backtrace (..., 0) dumps core on x86
4428 [18086] libc: nice() sets errno to 0 on success
4429 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4430 is too large (CVE-2015-8778)
4431 [18251] dynamic-link: SONAME missing when audit modules provides path
4432 [18265] libc: add attributes for wchar string and memory functions
4433 [18370] math: csqrt missing underflows
4434 [18421] libc: [hppa] read-only segment has dynamic relocations
4435 [18472] libc: Obsolete syscall wrappers should be compat symbols
4436 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4437 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4438 [18525] localedata: Remove locale timezone information
4439 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4440 [18568] localedata: Update locale data to Unicode 8.0
4441 [18589] locale: sort-test.sh fails at random
4442 [18595] math: ctan, ctanh missing underflows
4443 [18604] libc: assert macro-expands its argument
4444 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4445 contains a vector instruction exception.
4446 [18611] math: j1, jn missing errno setting on underflow
4447 [18618] localedata: sync Chechen locale definitions with other *_RU
4449 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4450 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4451 [18665] network: In send_dg, the recvfrom function is NOT always using the
4452 buffer size of a newly created buffer (CVE-2015-7547)
4453 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4455 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4457 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4458 [18699] math: tilegx cproj() for various complex infinities does not yield
4460 [18724] libc: Harden put*ent functions against data injection
4461 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4462 [18755] build: build errors with -DNDEBUG
4463 [18757] stdio: fmemopen fails to set errno on failure
4464 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4466 [18781] libc: openat64 lacks O_LARGEFILE
4467 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4468 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4469 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4470 [18790] math: [ldbl-128ibm] tanhl inaccurate
4471 [18795] libc: stpncpy fortification misses buffer lengths that are
4472 statically too large
4473 [18796] build: build fails for --disable-mathvec
4474 [18803] math: hypot missing underflows
4475 [18820] stdio: fmemopen may leak memory on failure
4476 [18823] math: csqrt spurious underflows
4477 [18824] math: fma spurious underflows
4478 [18825] math: pow missing underflows
4479 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4480 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4481 [18870] build: sem_open.c fails to compile with missing symbol
4483 [18872] stdio: Fix memory leak in printf_positional
4484 [18873] libc: posix_fallocate overflow check ineffective
4485 [18875] math: Excess precision leads incorrect libm
4486 [18877] libc: arm: mmap offset regression
4487 [18887] libc: memory corruption when using getmntent on blank lines
4488 [18918] localedata: hu_HU: change time to HH:MM:SS format
4489 [18921] libc: Regression: extraneous stat() and fstat() performed by
4491 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4492 binaries (CVE-2015-8777)
4493 [18951] math: tgamma missing underflows
4494 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4496 [18953] localedata: lt_LT: change currency symbol to the euro
4497 [18956] math: powf inaccuracy
4498 [18961] math: [i386] exp missing underflows
4499 [18966] math: [i386] exp10 missing underflows
4500 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4501 [18969] build: multiple string test failures due to missing locale
4503 [18970] libc: Reference of pthread_setcancelstate in libc.a
4504 [18977] math: float / long double Bessel functions not in XSI POSIX
4505 [18980] math: i386 libm functions return with excess range and precision
4506 [18981] math: i386 scalb*, ldexp return with excess range and precision
4507 [18982] stdio: va_list and vprintf
4508 [18985] time: Passing out of range data to strftime() causes a segfault
4510 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4511 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4512 [19012] locale: iconv_open leaks memory on error path
4513 [19016] math: clog, clog10 inaccuracy
4514 [19018] nptl: Mangle function pointers in tls_dtor_list
4515 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4516 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4517 [19048] malloc: malloc: arena free list can become cyclic, increasing
4519 [19049] math: [powerpc] erfc incorrect zero sign
4520 [19050] math: [powerpc] log* incorrect zero sign
4521 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4522 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4523 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4524 [19074] network: Data race in _res_hconf_reorder_addrs
4525 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4526 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4527 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4529 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4531 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4532 [19086] manual: posix_fallocate64 documented argument order is wrong.
4533 [19088] math: lround, llround missing exceptions close to overflow
4535 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4536 [19095] math: dbl-64 lrint incorrect for 64-bit long
4537 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4538 [19124] dynamic-link: ld.so failed to build with older assmebler
4539 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4540 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4541 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4542 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4543 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4544 pthread_setaffinity_np
4545 [19156] math: [ldbl-128] j0l spurious underflows
4546 [19164] nptl: tst-getcpu fails with many possible CPUs
4547 [19168] math: math/test-ildoubl and math/test-ldouble failure
4548 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4549 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4551 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4552 (FE_NOMASK_ENV) do not clear SSE exceptions
4553 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4554 _int_new_arena/reused_arena
4555 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4556 [19201] math: dbl-64 remainder incorrect sign of zero result
4557 [19205] math: bits/math-finite.h conditions do not match math.h and
4559 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4560 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4561 for C99-based standards
4562 [19212] libc: features.h not -Wundef clean
4563 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4565 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4566 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4567 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4569 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4570 "inexact" exceptions
4571 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4573 [19242] libc: strtol incorrect in Turkish locales
4574 [19243] malloc: reused_arena can pick an arena on the free list, leading
4575 to an assertion failure and reference count corruption
4576 [19253] time: tzset() ineffective when temporary TZ did not include DST
4578 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4579 [19270] math: [hppa] Shared libm missing __isnanl
4580 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4581 MAP_HUGETLB and MAP_STACK defines
4582 [19313] nptl: Wrong __cpu_mask for x32
4583 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4584 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4585 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4586 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4587 [19363] time: x32: times() return value wrongly truncates/sign extends
4589 [19367] dynamic-link: Improve branch prediction on Silvermont
4590 [19369] network: Default domain name not reset by res_ninit when "search"
4591 / "domain" entry is removed from resolv.conf
4592 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4594 [19385] localedata: bg_BG: time separator should be colon, not comma
4595 [19408] libc: linux personality syscall wrapper may erroneously return an
4596 error on 32-bit architectures
4597 [19415] libc: dladdr returns wrong names on hppa
4598 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4599 IBM905, IBM907, and IBM909
4600 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4601 [19443] build: build failures with -DDEBUG
4602 [19451] build: Make check fails on test-double-vlen2
4603 [19462] libc: Glibc failed to build with -Os
4604 [19465] math: Wrong code with -Os
4605 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4607 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4609 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4610 [19486] math: S390: Math tests fail with "Exception Inexact set".
4611 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4612 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4614 [19590] math: Fail to build shared objects that use libmvec.so functions.
4618 * The following bugs are resolved with this release:
4620 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4621 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4622 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4623 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4624 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4625 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4626 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4627 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4628 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4629 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4630 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4631 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4632 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4633 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4634 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4635 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4636 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4637 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4638 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4639 18657, 18676, 18694, 18696, 18887.
4641 * Cache information can be queried via sysconf() function on s390 e.g. with
4642 _SC_LEVEL1_ICACHE_SIZE as argument.
4644 * A buffer overflow in gethostbyname_r and related functions performing DNS
4645 requests has been fixed. If the NSS functions were called with a
4646 misaligned buffer, the buffer length change due to pointer alignment was
4647 not taken into account. This could result in application crashes or,
4648 potentially arbitrary code execution, using crafted, but syntactically
4649 valid DNS responses. (CVE-2015-1781)
4651 * The time zone file parser has been made more robust against crafted time
4652 zone files, avoiding heap buffer overflows related to the processing of
4653 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4654 large time zone data files. Overly long time zone specifiers in the TZ
4655 variable no longer result in stack overflows and crashes.
4657 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4658 for LD and GD on x86 and x86-64, has been implemented. You will need
4659 binutils-2.24 or later to enable this optimization.
4661 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4662 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4663 Hat). These updates cause user visible changes, such as the fix for bug
4666 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4667 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4668 condition in some applications.
4670 * Added vector math library named libmvec with the following vectorized x86_64
4671 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4673 The library can be disabled with --disable-mathvec. Use of the functions is
4674 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4675 Shared library libmvec.so is linked in as needed when using -lm (no need to
4676 specify -lmvec explicitly for not static builds).
4677 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4679 * A new fmemopen implementation has been added with the goal of POSIX
4680 compliance. The new implementation fixes the following long-standing
4681 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4682 old implementation is still present for use be by existing binaries.
4684 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4685 releases. It has been fixed to match 2.19 and older, but binaries built
4686 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4688 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4689 Contributed by Roland McGrath (Google).
4691 * The header <regexp.h> is deprecated, and will be removed in a future
4692 release. Use of this header will trigger a deprecation warning.
4693 Application developers should update their code to use <regex.h> instead.
4695 This header was formerly part of SUS, but was deprecated in 1994 and
4696 removed from the standard in 2001. Also, the glibc implementation
4697 leaks memory. See BZ#18681 for more details.
4701 * The following bugs are resolved with this release:
4703 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4704 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4705 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4706 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4707 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4708 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4709 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4710 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4711 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4712 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4715 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4716 too little memory for the to-be-scanned arguments and overflow the
4717 allocated buffer. The implementation now correctly computes the required
4718 buffer size when using malloc, and switches to malloc from alloca as
4721 * A new semaphore algorithm has been implemented in generic C code for all
4722 machines. Previous custom assembly implementations of semaphore were
4723 difficult to reason about or ensure that they were safe. The new version
4724 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4725 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4726 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4728 * Port to Altera Nios II has been contributed by Mentor Graphics.
4730 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4731 implementations for powerpc64/powerpc64le.
4732 Implemented by Adhemerval Zanella (IBM).
4734 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4735 and powerpc64le. This may improve lock scaling of existing programs on
4736 HTM capable systems. The lock elision code is only enabled with
4737 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4738 powerpc will issue a transaction abort on every syscall to avoid side
4739 effects being visible outside transactions.
4741 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4742 AArch64. Contributed by ARM Ltd.
4744 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4746 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4747 under certain input conditions resulting in the execution of a shell for
4748 command substitution when the application did not request it. The
4749 implementation now checks WRDE_NOCMD immediately before executing the
4750 shell and returns the error WRDE_CMDSUB as expected.
4752 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4753 processing format strings with a large number of format specifiers.
4755 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4756 infinite loop if the DNS response contained a PTR record of an unexpected
4759 * The minimum GCC version that can be used to build this version of the GNU
4760 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4761 still be used to compile programs using the GNU C Library.
4763 * The GNU C Library is now built with -Werror by default. This can be
4764 disabled by configuring with --disable-werror.
4766 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4768 * The obsolete sigvec function has been removed. This was the original
4769 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4770 programs have been using instead for about 25 years. Of course, ABI
4771 compatibility for old binaries using sigvec remains intact.
4773 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4774 with newer versions of bison.
4776 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4777 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4778 registers overlay two consecutive single-precision registers. MIPS32R2
4779 introduced a new FPU mode (FR=1) where double-precision registers extend the
4780 corresponding single-precision registers which is incompatible with the
4781 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4782 require the use of FR=1 making a transition necessary. New o32 ABI
4783 extensions enable users to migrate over time from the original o32 ABI
4784 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4785 tracks the ABI of any loaded object and verifies that new objects are
4786 compatible. Mode transitions will also be requested as required and
4787 unsupportable objects will be rejected. The ABI checks include both soft and
4788 hard float ABIs for o32, n32 and n64.
4790 GCC 5 with GNU binutils 2.25 onwards:
4791 It is strongly recommended that all o32 system libraries are built using the
4792 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4793 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4794 compiler using --with-fp-32=xx to set this by default.
4798 * The following bugs are resolved with this release:
4800 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4801 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4802 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4803 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4804 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4805 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4806 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4807 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4808 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4809 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4810 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4811 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4812 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4813 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4814 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4816 * Reverted change of ABI data structures for s390 and s390x:
4817 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4818 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4819 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4820 are preserved pointing straight to the same implementation as the old ones.
4821 Given that, new callers will simply provide a too-big buffer to these
4822 functions. Any applications/libraries out there that embed jmp_buf or
4823 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4824 against 2.19 headers will have to rebuilt again. This is necessary in any
4825 case to revert the breakage in their ABI caused by the glibc change.
4827 * Support for file description locks is added to systems running the
4828 Linux kernel. The standard file locking interfaces are extended to
4829 operate on file descriptions, not file descriptors, via the use of
4830 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4831 are associated with an open file instead of a process.
4833 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4835 * The minimum Linux kernel version that this version of the GNU C Library
4836 can be used with is 2.6.32.
4838 * Running the testsuite no longer terminates as soon as a test fails.
4839 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4840 with PASS or FAIL lines for individual tests. A summary of the results is
4841 printed, including a list of failing lists, and "make check" exits with
4842 error status if there were any unexpected failures. "make check
4843 stop-on-test-failure=y" may be used to keep the old behavior.
4845 * The am33 port, which had not worked for several years, has been removed
4848 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4849 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4850 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4851 conflicted with POSIX (support for which was removed in 2.19), the
4852 interfaces those macros enabled remain available when compiling with
4853 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4854 test macros defined.
4856 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4858 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4859 This may improve lock scaling of existing programs on TX capable systems.
4860 The lock elision code is only built with --enable-lock-elision=yes and
4861 then requires a GCC version supporting the TX builtins. With lock elision
4862 default mutexes are elided via __builtin_tbegin, if the cpu supports
4863 transactions. By default lock elision is not enabled and the elision code
4866 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4867 copy the path argument. This allowed programs to cause posix_spawn to
4868 deference a dangling pointer, or use an unexpected pathname argument if
4869 the string was modified after the posix_spawn_file_actions_addopen
4872 * All supported architectures now use the main glibc sysdeps directory
4873 instead of some being in a separate "ports" directory (which was
4874 distributed separately before glibc 2.17).
4876 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4877 On configurations that support it (all Linux configurations), it's now
4878 used regardless of the --enable-add-ons switch to configure. It is no
4879 longer possible to build such configurations without pthreads support.
4881 * Locale names, including those obtained from environment variables (LANG
4882 and the LC_* variables), are more tightly checked for proper syntax.
4883 setlocale will now fail (with EINVAL) for locale names that are overly
4884 long, contain slashes without starting with a slash, or contain ".." path
4885 components. (CVE-2014-0475) Previously, some valid locale names were
4886 silently replaced with the "C" locale when running in AT_SECURE mode
4887 (e.g., in a SUID program). This is no longer necessary because of the
4890 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4891 with application code using Intel MPX instructions. (With all previous
4892 versions, the MPX register state could be clobbered when making calls
4893 into or out of a shared library.) Note that while the new dynamic
4894 linker is compatible with all known x86 hardware whether or not it
4895 supports Intel MPX, some x86 instruction-set emulators might fail to
4896 handle the new instruction encodings. This is known to affect Valgrind
4897 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4898 release), and might affect other tools that do instruction emulation.
4900 * Support for loadable gconv transliteration modules has been removed.
4901 The support for transliteration modules has been non-functional for
4902 over a decade, and the removal is prompted by security defects. The
4903 normal gconv conversion modules are still supported. Transliteration
4904 with //TRANSLIT is still possible, and the //IGNORE specifier
4905 continues to be supported. (CVE-2014-5119)
4907 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4908 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4909 resulting a denial-of-service security vulnerability in applications which
4910 use functions related to iconv. (CVE-2014-6040)
4914 * The following bugs are resolved with this release:
4916 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4917 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4918 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4919 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4920 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4921 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4922 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4923 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4924 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4925 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4926 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4927 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4928 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4929 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4930 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4931 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4932 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4933 16431, 16453, 16474, 16506, 16510, 16529
4935 * Slovenian translations for glibc messages have been contributed by the
4936 Translation Project's Slovenian team of translators.
4938 * The public headers no longer use __unused nor __block. This change is to
4939 support compiling programs that are derived from BSD sources and use
4940 __unused internally, and to support compiling with Clang's -fblock
4941 extension which uses __block.
4943 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4944 large collation sequences to optimize multiple passes. This cache
4945 computation may overflow for large collation sequences and may cause a
4946 stack or buffer overflow. This is now fixed to use a slower algorithm
4947 which does not use a cache if there is an integer overflow.
4949 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4950 rules for large collation sequences to optimize multiple passes and falls
4951 back to alloca if malloc fails, resulting in a possible stack overflow.
4952 The implementation now falls back to an uncached collation sequence lookup
4955 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4956 initialized for static applications resulting in the security feature
4957 being disabled. The pointer guard is now correctly initialized to a
4958 random value for static applications. Existing static applications need
4959 to be recompiled to take advantage of the fix (bug 15754).
4961 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4962 to the d_name member of struct dirent, or omit the terminating NUL
4963 character. (Bugzilla #14699).
4965 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4966 aligned_alloc functions could allocate too few bytes or corrupt the
4967 heap when passed very large allocation size values (Bugzilla #15855,
4970 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4971 for AF_INET6 has been fixed (Bugzilla #16072).
4973 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4974 pap_CW, quz_PE, the_NP.
4976 * Substantially revised locales: gd_GB, ht_HT
4978 * The LC_ADDRESS field was updated to support country_car for almost all
4981 * ISO 1427 definitions were updated.
4983 * ISO 3166 definitions were updated.
4985 * The localedef utility now supports --big-endian and --little-endian
4986 command-line options to generate locales for a different system from that
4987 for which the C library was built.
4989 * Binary locale files now only depend on the endianness of the system for
4990 which they are generated and not on other properties of that system. As a
4991 consequence, binary files generated with new localedef may be incompatible
4992 with old versions of the GNU C Library, and binary files generated with
4993 old localedef may be incompatible with this version of the GNU C Library,
4994 in the following circumstances:
4996 + Locale files may be incompatible on m68k systems.
4998 + Locale archive files (but not separate files for individual locales) may
4999 be incompatible on systems where plain "char" is signed.
5001 * The configure option --disable-versioning has been removed. Builds with
5002 --disable-versioning had not worked for several years.
5004 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
5005 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
5007 * SystemTap probes for malloc have been introduced.
5009 * SystemTap probes for slow multiple precision fallback paths of
5010 transcendental functions have been introduced.
5012 * Support for powerpc64le has been added.
5014 * The soft-float powerpc port now supports e500 processors.
5016 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
5018 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
5019 set of header declarations that are enabled by default, even when other
5020 feature test macros or compiler options such as -std=c99 would otherwise
5021 disable some of those declarations.
5023 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
5024 conflict with POSIX. The libbsd-compat library (which was a dummy library
5025 that did nothing) has also been removed.
5027 * Preliminary documentation about Multi-Thread, Async-Signal and
5028 Async-Cancel Safety has been added.
5030 * Change of ABI data structures for s390 and s390x:
5031 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
5032 allow for future hardware extensions. All library functions that accept or
5033 return these structures were versioned in order to provide backwards
5034 compatibility with existing code. However, not all cases can be handled
5035 with interface versioning. If an application embeds either structure into
5036 another structure and that structure is passed to another compilation unit
5037 which expects the newer larger-sized object then any access to the new
5038 fields will result in undefined behaviour. Similarly any access to fields
5039 that were moved by the enlarging of the structures will cause undefined
5040 behaviour. To fix the undefined behaviour all objects that are part of the
5041 final in-memory image must agree on the size of structures, and this may
5042 require recompilation.
5046 * The following bugs are resolved with this release:
5048 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
5049 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
5050 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
5051 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
5052 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
5053 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
5054 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
5055 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
5056 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
5057 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
5058 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
5059 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
5060 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
5063 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
5064 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
5065 Distributions can re-enable building and using pt_chown via the new configure
5066 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
5067 considerable security risks and should only be used if the distribution
5068 understands and accepts the risks.
5070 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
5073 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
5074 fixed (Bugzilla #15330).
5076 * Add support for calling C++11 thread_local object destructors on thread
5077 and program exit. This needs compiler support for offloading C++11
5078 destructor calls to glibc.
5080 * Improved worst case performance of libm functions with double inputs and
5083 * Support for priority inherited mutexes in pthread condition variables on
5084 non-x86 architectures.
5086 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
5088 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
5090 * Optimized string functions for ARM. Implemented by Will Newton and
5093 * Optimized libm functions for SPARC. Implemented by David S. Miller.
5095 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
5098 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
5099 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
5101 * Added a benchmark framework to track performance of functions in glibc.
5103 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
5104 It is based on draft TS 18661 and currently enabled as a GNU extension.
5106 * On Linux, the clock function now uses the clock_gettime system call
5107 for improved precision, rather than old times system call.
5109 * Added support for version-3 tz format files. This is needed when using
5110 the tz database release 2013e or later, and affects a few unusual cases --
5111 currently only TZ='America/Godthab' for time stamps after 2037.
5113 * Added new API functions pthread_getattr_default_np and
5114 pthread_setattr_default_np to get and set the default pthread
5115 attributes of a process.
5117 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
5118 This may improve lock scaling of existing programs on TSX capable systems.
5119 When the --enable-lock-elision=yes parameter is specified at configure
5120 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
5123 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
5124 availability). Implemented by Ryan S. Arnold.
5126 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
5130 * The following bugs are resolved with this release:
5132 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
5133 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
5134 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
5135 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
5136 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
5137 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
5138 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
5139 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
5140 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
5141 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
5142 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
5143 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
5144 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
5145 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
5146 14879, 14889, 14893, 14898, 14914.
5148 * Optimization of memcpy for MIPS.
5150 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5151 EMFILE has been fixed (Bugzilla #14889).
5153 * The add-on ports collection is now distributed in the "ports" subdirectory
5154 of the main GNU C Library distribution, rather than separately.
5156 * Port to ARM AArch64 contributed by Linaro.
5158 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5159 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5161 Implemented by Andreas Krebbel.
5163 * The new function secure_getenv allows secure access to the environment,
5164 returning NULL if running in a SUID/SGID process. This function replaces
5165 the internal function __secure_getenv.
5167 * SystemTap static probes have been added into the dynamic linker.
5168 Implemented by Gary Benson.
5170 * Optimizations of string functions strstr, strcasestr and memmem.
5171 Implemented by Maxim Kuvyrkov.
5173 * The minimum Linux kernel version that this version of the GNU C Library
5174 can be used with is 2.6.16.
5176 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5177 powerpc POWER7. Implemented by Will Schmidt.
5179 * New configure option --disable-nscd builds the C library such that it
5180 never attempts to contact the Name Service Caching Daemon (nscd).
5181 New configure option --disable-build-nscd avoids building nscd itself;
5182 this is the default if --disable-nscd is used.
5184 * Improved support for cross-compilation, including cross-testing and
5185 bootstrap builds without a previously built glibc.
5187 * Several testsuite tests are now able to test multiple IFUNC variants of an
5188 interface, rather than just testing the one that would be chooen by
5191 * New configure options --with-bugurl and --with-pkgversion, for
5192 distributors to use to embed their bug-reporting and package version
5193 information in --help and --version output.
5195 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5196 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5197 allows creation of chroots without the procfs mounted on /proc.
5199 * The `crypt' function now fails if passed salt bytes that violate the
5200 specification for those values. On Linux, the `crypt' function will
5201 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5202 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5203 when the mode is enabled.
5205 * The `clock_*' suite of functions (declared in <time.h>) is now available
5206 directly in the main C library. Previously it was necessary to link with
5207 -lrt to use these functions. This change has the effect that a
5208 single-threaded program that uses a function such as `clock_gettime' (and
5209 is not linked with -lrt) will no longer implicitly load the pthreads
5210 library at runtime and so will not suffer the overheads associated with
5211 multi-thread support in other code such as the C++ runtime library.
5213 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5218 * The following bugs are resolved with this release:
5220 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5221 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5222 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5223 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5224 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5225 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5226 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5227 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5228 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5229 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5230 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5231 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5232 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5233 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5234 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5235 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5236 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5237 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5238 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5239 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5240 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5241 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5244 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5245 configuring glibc with:
5246 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5247 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5248 Implemented by H.J. Lu.
5252 + define static_assert
5254 + do not declare gets
5256 + declare at_quick_exit and quick_exit also for ISO C11
5258 + aligned_alloc. NB: The code is deliberately allows the size parameter
5259 to not be a multiple of the alignment. This is a moronic requirement
5260 in the standard but it is only a requirement on the caller, not the
5263 + timespec_get added
5265 + uchar.h support added
5267 + CMPLX, CMPLXF, CMPLXL added
5269 Implemented by Ulrich Drepper.
5271 * Support for the IA-64 has been moved to ports.
5273 * Remove support for anything but ELF binary format
5275 * Checking versions of poll, ppoll added.
5276 Implemented by Ulrich Drepper.
5278 * More generic and 64-bit performance optimizations to math functions.
5279 Implemented by Ulrich Drepper.
5281 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5282 headers and functions available at compile time as they were before
5283 version 2.14. This option will be removed at some time in the future
5284 after the TI-RPC library becomes fully sufficient for the needs of
5285 existing applications.
5287 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5288 Note that glibc is not expected to work with any Linux kernel version
5291 * New header <sys/auxv.h> and function getauxval allowing easy access to
5292 the AT_* key-value pairs passed from the Linux kernel. The header also
5293 defines the HWCAP_* bits associated with the AT_HWCAP key.
5295 * New locales: mag_IN
5297 * New configure option --enable-systemtap builds SystemTap static probes
5298 into libc for setjmp and longjmp and into libpthread for various operations.
5299 So far the setjmp/longjmp probes and some of the libpthread probes are
5300 provided only for i*86 and x86_64.
5301 Implemented by Roland McGrath and Rayson Ho.
5303 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5305 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5308 * More optimized functions for SPARC. Implemented by David S. Miller.
5310 * Improved support for cross-compilation, especially bootstrap builds
5311 without a previously built glibc.
5313 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5314 Chris Metcalf from Tilera.
5316 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5317 now supported for ARM processors.
5319 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5320 as the name of the dynamic linker, to distinguish it from the
5321 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5323 * Support for CRIS has been removed from ports.
5325 * A new class of installed header has been documented for low-level
5326 platform-specific functionality. PowerPC added the first instance with a
5327 function to provide time base register access. Contributed by Tulio
5328 Magno Quites Machado Filho.
5330 * ix86 configurations now install header files that are consistent with
5331 what x86-64 configurations install. These same header files can be used
5332 for -m32, -m64, or -mx32 builds.
5333 Contributed by H.J. Lu.
5335 * Math library bug fixes. A thorough audit of all open math library bugs was
5336 conducted by Joseph Myers. Significant progress was made on many math
5337 library bugs resulting in more accurate exceptions and function results.
5338 Many thanks to all those that contributed including Andreas Jaeger for his
5339 patch review and work on the x87 trigonometric instruction issues.
5341 * Timezone data is no longer installed. Timezone-related binaries and scripts
5342 will continue to be installed. Users should obtain their timezone data from
5343 their distribution provider or from the tzdata package at
5344 <ftp://munnari.oz.au/pub/>.
5348 * The following bugs are resolved with this release:
5350 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5351 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5352 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5353 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5354 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5355 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5356 13484, 13506, 13515, 13523, 13524, 13538, 13540
5358 * New program pldd to list loaded object of a process
5359 Implemented by Ulrich Drepper.
5361 * Add nss_db support back to glibc. No more dependency on Berkeley db
5362 and support for initgroups lookups.
5363 Implemented by Ulrich Drepper.
5365 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5366 Contributed by HJ Lu.
5368 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5369 Contributed by HJ Lu.
5371 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5372 on x86-32 and x86-64.
5373 Contributed by Liubov Dmitrieva.
5375 * Optimized strchr and strrchr for SSE on x86-32.
5376 Contributed by Liubov Dmitrieva.
5378 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5379 for x86-64 and x86-32.
5380 Contributed by Liubov Dmitrieva.
5382 * New interfaces: scandirat, scandirat64
5383 Implemented by Ulrich Drepper.
5385 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5386 Implemented by Ulrich Drepper.
5388 * nscd now also caches the netgroup database.
5389 Implemented by Ulrich Drepper.
5391 * Integrate libm with gcc's -ffinite-math-only option.
5392 Implemented by Ulrich Drepper.
5394 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5395 to math functions. Implemented by Ulrich Drepper.
5397 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5398 Implemented by Ulrich Drepper.
5400 * New Linux interfaces: process_vm_readv, process_vm_writev
5402 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5403 Implemented by Ulrich Drepper.
5405 * Optimized nearbyint and strcasecmp for PPC.
5406 Implemented by Adhemerval Zanella.
5408 * New locales: bho_IN, unm_US, es_CU, ta_LK
5412 * The following bugs are resolved with this release:
5414 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5415 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5416 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5417 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5418 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5419 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5420 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5421 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5422 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5423 12795, 12811, 12813, 12814, 12841
5425 * The RPC implementation in libc is obsoleted. Old programs keep working
5426 but new programs cannot be linked with the routines in libc anymore.
5427 Programs in need of RPC functionality must be linked against TI-RPC.
5428 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5430 Visible changes of this change include (obviously) the inability to link
5431 programs using RPC functions without referencing the TI-RPC library and the
5432 removal of the RPC headers from the glibc headers.
5433 Implemented by Ulrich Drepper.
5435 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5436 syncfs, setns, sendmmsg
5438 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5439 yue_HK, lij_IT, mhr_RU
5441 * New encodings: CP770, CP771, CP772, CP773, CP774
5443 * New program sotruss to trace calls through PLTs
5444 Implemented by Ulrich Drepper.
5446 * The malloc hook implementation is marked deprecated and will be removed
5447 from the default implementation in the next version. The design never
5448 worked ever since the introduction of threads. Even programs which do
5449 not create threads themselves can use multiple threads created internally.
5453 * The following bugs are resolved with this release:
5455 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5456 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5457 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5458 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5461 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5463 * POWER7 optimizations: memset, memcmp, strncmp
5465 * New optimized string functions for x86-64: strnlen (SSE2),
5466 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5467 Implemented by Ulrich Drepper.
5471 * The following bugs are resolved with this release:
5473 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5474 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5475 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5476 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5477 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5478 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5479 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5480 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5482 * New interfaces: pthread_getname_np, pthread_setname_np
5484 * New Linux interface: recvmmsg
5486 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5488 * The dynamic linker now recognizes supported ABI versions from the
5489 EI_ABIVERSION field in the ELF header.
5490 Implemented by Ulrich Drepper.
5492 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5493 will not be used to fill in password fields in the passwd.byname replies.
5494 Instead it is used to synthesize the shadow.byname table, should it be
5495 missing. This is a useful mode in some installations involving Solaris.
5496 Implemented by Ulrich Drepper.
5498 * New locales: kok_IN, sq_MK, cv_RU
5502 * The following bugs are resolved with this release:
5504 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5505 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5506 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5507 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5508 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5509 10789, 10817, 10823, 10840, 10847
5511 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5513 Implemented by Ulrich Drepper.
5515 * Checking version of longjmp added that fails if an uninitialized stack
5516 frame would be created. Implemented by Ulrich Drepper.
5518 * STT_GNU_IFUNC is now supported in static executables.
5519 Implemented by H.J. Lu.
5521 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5523 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5524 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5525 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5526 Contributed by H.J. Lu.
5528 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5529 Implemented by Ulrich Drepper.
5531 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5533 Contributed by H.J. Lu.
5535 * Support for fma instruction in AVX on x86-64.
5536 Implemented by H.J. Lu and Ulrich Drepper.
5538 * AVX support in x86-64 auditing support in ld.so.
5539 Implemented by H.J. Lu.
5541 * STB_GNU_UNIQUE support added.
5542 Implemented by Ulrich Drepper.
5544 * Implement second fallback mode for optimized DNS lookup for even more
5545 broken environments. If two requests from the same port are not
5546 handled correctly close the socket and open a new one before sending
5547 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5548 can be used to select this mode right away, instead of rediscovering the
5549 necessity is every process again.
5550 Implemented by Ulrich Drepper.
5552 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5553 Implemented by Adam Tkac.
5555 * Optimized iconv conversions for S390x.
5556 Implemented by Andreas Krebbel.
5558 * Using condvars with PI mutexes is now more efficient due to kernel
5559 support for requeueing to PI futexes. NPTL support added for x86-64.
5560 Implemented by Ulrich Drepper.
5562 * New locales: ps_AF, my_MM
5566 * The following bugs are resolved with this release:
5568 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5569 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5570 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5571 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5572 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5574 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5575 Implemented by Ulrich Drepper.
5577 * New Linux interfaces: accept4, fallocate, fallocate64.
5578 Implemented by Ulrich Drepper.
5580 * Correct declarations of string function when used in C++ code. This
5581 could lead to compile errors for invalid C++ code.
5583 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5586 * New POSIX 2008 interface: psiginfo
5587 Implemented by Ulrich Drepper.
5589 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5590 Implemented by Ulrich Drepper.
5592 * Support for selecting between multiple function definitions at runtime
5593 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5595 * The libcrypt library can now use the hash function implementations in
5596 NSS. Implemented by Ulrich Drepper.
5598 * The malloc implementation can be compiled to be less memory efficient
5599 but higher performing in multi-threaded programs.
5600 Implemented by Ulrich Drepper.
5602 * New locales: nan_TW@latin, ks_IN
5604 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5605 Implemented by Ulrich Drepper.
5607 * Extended printf hook support. It is possible to use user-defined types
5608 and extend existing format specifiers.
5609 Implemented by Ulrich Drepper.
5611 * Handling for group shadow files has been added.
5612 Implemented by Ulrich Drepper.
5614 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5615 servers (the case, e.g., for some people using the built-in DNS
5616 server in ADSL modems/routers). There is a once-per-process timeout
5617 in case of a broken server. To avoid it, users can run nscd or put
5618 'options single-request' in /etc/resolv.conf.
5619 Implemented by Ulrich Drepper.
5623 * The following bugs are resolved with this release:
5625 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5626 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5627 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5628 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5629 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5631 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5632 up at the same time. Implemented by Ulrich Drepper.
5634 * TLS descriptors for LD and GD on x86 and x86-64.
5635 Implemented by Alexandre Oliva.
5637 * getaddrinfo now handles DCCP and UDPlite.
5638 Implemented by Ulrich Drepper.
5640 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5641 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5642 Implemented by Ulrich Drepper.
5644 * New implementation of memmem, strstr, and strcasestr which is O(n).
5645 Implemented by Eric Blake.
5647 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5649 * Implement "e" option for popen to open file descriptor with the
5650 close-on-exec flag set. Implemented by Ulrich Drepper.
5652 * Implement "b" mode for fmemopen. In this mode writes writes don't
5653 implicitly add a NUL byte and seeks from the end of the buffer really
5654 use the buffer end, not the string length as the basis.
5655 Implemented by Ulrich Drepper.
5657 * Many functions, exported and internal, now atomically set the close-on-exec
5658 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5660 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5662 Implemented by Pravin Satpute.
5664 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5668 * The following bugs are resolved with this release:
5670 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5671 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5672 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5673 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5674 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5675 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5676 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5678 * New locales: bo_CN, bo_IN, shs_CA.
5680 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5682 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5683 Implemented by Pravin Satpute.
5685 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5687 * nscd caches now all timeouts for DNS entries
5688 Implemented by Ulrich Drepper.
5690 * nscd is more efficient and wakes up less often.
5691 Implemented by Ulrich Drepper.
5693 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5694 vdprintf, and obstack_vprintf.
5695 Implemented by Jakub Jelinek.
5697 * Faster memset for x86-64.
5698 Implemented by Harsha Jagasia and H.J. Lu.
5700 * Faster memcpy on x86.
5701 Implemented by Ulrich Drepper.
5703 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5704 Implemented by Ulrich Drepper.
5706 * Faster sqrt and sqrtf implemention for some PPC variants.
5707 Implemented by Steven Munroe.
5711 * The following bugs are resolved with this release:
5713 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5714 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5715 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5716 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5717 5071, 5103, 5104, 5112, 5113, 5184, 5186
5719 * More checking functions: fread, fread_unlocked, open*, mq_open.
5720 Implemented by Jakub Jelinek and Ulrich Drepper.
5722 * Extend fortification to C++. Implemented by Jakub Jelinek.
5724 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5725 by not recognizing 'a' as a modifier when those specs are requested.
5726 Implemented by Jakub Jelinek.
5728 * PPC optimizations to math and string functions.
5729 Implemented by Steven Munroe.
5731 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5732 options to be passed. Implemented by Ulrich Drepper.
5734 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5736 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5737 Implemented by Ulrich Drepper.
5739 * Handle private futexes in the NPTL implementation.
5740 Implemented by Jakub Jelinek and Ulrich Drepper.
5742 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5743 Implemented by Roland McGrath and Ulrich Drepper.
5745 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5747 * SHA-256 and SHA-512 based password encryption.
5748 Implemented by Ulrich Drepper.
5750 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5751 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5754 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5755 Implemented by Ulrich Drepper.
5759 * The following bugs are resolved with this release:
5761 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5762 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5763 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5764 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5765 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5766 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5767 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5770 * New Linux interfaces: epoll_pwait, sched_getcpu.
5772 * New generic interfaces: strerror_l.
5774 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5778 * The following bugs are resolved with this release:
5780 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5781 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5782 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5783 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5784 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5785 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5786 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5787 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5788 3225, 3251, 3252, 3253, 3273
5790 * For Linux, the sorting of addresses returned by getaddrinfo now also
5791 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5792 Implemented by Ulrich Drepper.
5794 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5795 Implemented by Ulrich Drepper.
5797 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5799 * New iconv module for MIK. Contributed by Alexander Shopov.
5801 * For sites with broken group and/or passwd database, the auto-propagate
5802 option of nscd can prevent creating ID lookup entries from the results
5803 of a name lookup and vice versa. This usually is no problem but some
5804 site might have problems with the default behavior.
5805 Implemented by Ulrich Drepper.
5807 * Iterating over entire database in NIS can be slow. With the
5808 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5809 to trade time for memory. The entire database will be read at once.
5810 Implemented by Ulrich Drepper.
5812 * The interfaces introduced in RFC 3542 have been implemented by
5815 * Support for the new ELF hash table format was added by Ulrich Drepper.
5817 * Support for priority inheritance mutexes added by Jakub Jelinek and
5820 * Support for priority protected mutexes added by Jakub Jelinek.
5822 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5823 or_IN, csb_PL, fy_NL, sr_ME.
5827 * More overflow detection functions.
5829 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5830 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5832 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5833 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5834 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5835 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5836 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5837 by Masahide Washizawa.
5839 * It is now possible to install audit libraries for the dynamic linker using
5840 LD_AUDIT. Implemented by Ulrich Drepper.
5842 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5843 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5844 For a libc and libpthread that works well on Linux 2.4 kernels, we
5845 recommend using the stable 2.3 branch.
5847 * The new function open_wmemstream acts like open_memstream,
5848 but uses a wchar_t wide character buffer.
5850 * The new function ppoll is an improved version of poll, similar to pselect.
5852 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5853 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5854 renameat, unlinkat, linkat, symlinkat, readlinkat.
5856 * New Linux kernel system calls: unshare,
5857 inotify_init, inotify_add_watch, inotify_rm_watch.
5859 * The euidaccess function is now also known by the alias eaccess,
5860 for compatibility with some other systems.
5862 * Timezone data updated to 2006b version.
5866 * The following bugs are resolved with this release:
5868 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5869 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5870 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5871 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5872 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5873 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5875 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5877 * As of this release, GCC 4 can be used to compile the C Library.
5879 * Timezone data updated to 2005m version.
5883 * The following bugs are resolved with this release:
5885 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5886 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5887 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5888 777, 787, 821, 822, 823, 825
5890 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5894 * Support for RFC 3678. Real implementations exist only for Linux so far.
5895 Implemented by Ulrich Drepper.
5897 * nscd can now cache entries persistently. Expiring entries are reloaded.
5898 For speedups the cache can be shared in memory with client processes.
5899 Implemented by Ulrich Drepper.
5901 * nscd can now perform SELinux checks.
5902 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5904 * getaddrinfo queries are now cached. Canonical name lookup is performed
5906 Implemented by Ulrich Drepper.
5908 * The nothrow function attribute is used when headers are used by gcc when
5909 compiling C code. This can avoid significant amounts of exception
5912 * The malloc functions perform more error checking and are stricter when
5913 it comes to reacting on errors. The default action is to terminate
5914 the process after showing an error message. Implemented by Ulrich Drepper.
5916 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5917 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5919 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5920 namespaces using the new function dlmopen(). This feature is of course,
5921 like most other dynamic loading functionality, not available in statically
5922 linked applications. Implemented by Ulrich Drepper.
5924 * Low-overhead boundary checking variants of string and some stdio functions
5925 were added. These are to be used in conjunction with a gcc patch by
5926 Jakub Jelinek which adds calls to these functions if possible.
5927 Implemented by Jakub Jelinek and Ulrich Drepper.
5929 * Old code for several operating systems and machine architectures that
5930 have not been in working condition in a long time have been removed from
5931 the main source tree maintained by the GNU C Library's maintainers.
5932 These files are now reside in the separate `ports' source module
5933 that is usable as an add-on when building the library.
5937 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5938 interrogate the dynamic linker, compatible with the Solaris interface.
5940 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5941 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5943 * getifaddrs now uses the netlink interface on Linux to get its information.
5944 Implemented by Thorsten Kukuk.
5946 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5947 Implemented by Ulrich Drepper.
5949 * support for non-executable stacks on x86 has been added. Changes mostly
5952 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5955 * getaddrinfo now performs destination address selection according to
5960 * Thread-safe interfaces for many functions that access locale data
5961 were added in version 2.3, but these features were omitted from NEWS.
5962 Many functions have variants with an `_l' suffix that take a `locale_t'
5963 object as a parameter rather than consulting the current locale.
5964 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5965 create and maintain `locale_t' objects. Additionally, the new function
5966 `uselocale' sets "the current locale" (as used by functions not so
5967 parameterized) set for an individual thread. These features were added
5968 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5970 * The functions getresuid, getresgid, setresuid, and setresgid, which
5971 have long been available on Linux, are now declared in <unistd.h>
5972 and are now also available on the Hurd.
5974 * ELF thread-local storage support (TLS) now works on x86-64.
5976 * The new dynamic string token $LIB is expanded in shared library names.
5977 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5979 * Aldy Hernandez contributed complete software floating point support for
5980 PowerPC machines with no FPU.
5982 * fexecve is implemented on Linux.
5984 * The `btowc' function should work at least twice as fast due to
5985 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5987 * With approriate thread add-ons cancelable functions are now implemented
5988 in libc.so as well. No need to call the function in libpthread. This
5989 change allowed to finally disable the incorrect and expensive handling
5990 of weak definition in ld.so.
5992 * Yet more PLT entries in libc.so have been removed. We finally arrived
5993 at the bare minimum. Startup times improved appropriately.
5995 * Support for the new Linux/x86 system call interface was added. The
5996 AT_SYSINFO auxiliary vector entry is recognized and handled.
6000 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
6003 * iconv (the program and the interface) now accepts empty names (excluding
6004 options like //TRANSLIT) to mean "use charset of current locale".
6006 * localedef can now transliterate characters in strings which are not in
6007 the provided charmap. The information from the input locale is used.
6009 * Prelinking support was added for ELF targets. This requires additional
6010 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
6012 * Read-only stdio streams now use mmap to speed up operation by eliminating
6013 copying and buffer underflows. To use add 'm' to the mode string of
6014 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
6016 * The malloc functions were completely rewritten by Wolfram Gloger based
6017 on Doug Lea's malloc-2.7.0.c.
6019 * Isamu Hasegawa contributed a completely new and POSIX-conformant
6020 implementation of regex.
6022 * Bruno Haible upgraded the iconv and locale implementation to support
6025 * Contents of the LC_* and LANG environment variables in the CEN style are
6026 not recognized anymore. It never was used. Change by Ulrich Drepper.
6028 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
6029 thread-local storage (TLS) ABI on some platforms.
6030 Changes by Ulrich Drepper. SH support by Kaz Kojima.
6032 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
6033 EUC-JISX0213, and TSCII.
6035 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
6036 BSD-compatible interface for getting all network interface addresses.
6037 Implementation for IPv4 by Roland McGrath.
6039 * Loading of locale data is faster due to the introduction of a locale
6040 archive. Implemented by Roland McGrath and Ulrich Drepper.
6042 * Startup times are significantly reduced by not using exported functions
6043 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
6046 * Steven Munroe contributed a port to PowerPC64/Linux.
6050 * The Hurd now uses the GNU libio implementation of stdio rather than the
6051 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
6053 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
6054 with the same behavior as the Linux system call of the same name.
6058 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
6059 128-bit long double format.
6061 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
6062 IBM1161, and IBM1162 charsets.
6064 * Andreas Jaeger contributed a port to x86-64/Linux.
6066 * Peter Bruin contributed a port to PowerPC/Hurd.
6068 * libc functions using I/O streams now can handle wide-oriented streams
6071 * optimizations in the dynamic linker. Binaries created by recent binutils
6072 versions start up quicker due to reduced time spent on relocations.
6074 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
6078 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
6079 asinh, atanh, j0 for the 128-bit long double format.
6081 * Bruno Haible updated all the code handling Unicode in some form to
6082 support Unicode 3.1.
6084 * Speed of regex for single-byte locales is back to previous levels.
6085 Patch by Isamu Hasegawa.
6087 * Alpha, SPARC, and IA-64 now also using floating stacks.
6089 * Startup time of internationalized applications greatly improved through
6090 iconv cache. Use iconvconfig to generate the cache file.
6091 Contributed by Ulrich Drepper.
6093 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
6094 severe performance problems. Patch by David Mosberger.
6096 * The Hurd port got a lot more functionality like AIO, various stdio
6097 extensions, etc. Mainly done by Roland McGrath.
6099 * mtrace can now lookup symbols in shared libraries.
6103 * Intel's IA-64 math library is largely integrated. It provides fast and
6104 accurate implementatations for most basic and standard math functions
6105 in float, double, and long double format.
6107 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
6108 and asin for the 96-bit long double format and asin, log, tan for the
6109 128-bit long double format.
6111 * The beginning of a last-bit accurate math library by IBM Haifa were added.
6112 The basic double functions exist today. Contributed by Abraham Ziv
6113 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
6114 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
6116 * An asynchronous name lookup library was added. The interface is designed
6117 after POSIX AIO. The proposal was circulated beforehand to get comments.
6118 No negative ones came in. Implemented by Ulrich Drepper.
6120 * Port to S390/64bit contributed by Martin Schwidefsky
6121 <schwidefsky@de.ibm.com>.
6123 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
6124 of functions for Linux/IA-64.
6126 * The RPC code is now thread safe. Threads can now use the same service
6127 of different services at the same time. Patch by Eric Norum
6128 <eric.norum@usask.ca> with some help by Ulrich Drepper.
6130 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
6131 family of functions for Linux/S390.
6133 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
6134 of functions for Linux/x86.
6136 * Port to Linux/CRIS contributed by Axis Communications.
6140 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
6141 we can now check for namespace violations and missing declarations. The
6142 result is that almost all headers are now Unix-compliant (as defined in
6143 the upcoming XPG6). The negative side is that some programs might need
6144 corrections, too, if they depend on the incorrect form of the headers in
6145 previous versions which defined too many symbols and included too many
6148 * regex now handles multibyte character sets correctly.
6149 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6151 * iconv (the program) does now conform to the upcoming XPG6 and handles
6152 charmaps. Instead of the charset names the path of charmaps can be
6153 provided and the conversion happens based on this data.
6154 Contributed by Ulrich Drepper.
6156 * The locale program now provides detailed information about the installed
6161 only lists the names of the supported locales
6165 provides details such as country, language, and codeset name.
6166 Contributed by Ulrich Drepper.
6170 * The gencat program now parses the input file according to the charset
6171 selected by the LC_CTYPE category. This is important for stateful
6172 character sets. To make generating catalogs easier there is a way
6173 to overwrite the charset selected by the locale: before the first
6174 message or $ quote line the catalog can contain a line like
6176 $ codeset=ISO-8859-2
6178 to select the charset (ISO-8859-2 in this case).
6180 Implemented by Shinya Hanataka and Ulrich Drepper.
6182 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6183 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6184 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6186 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6187 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6189 * The LANGUAGE environment variable is now ignored unless the locale is
6190 changed from the default "C" locale.
6192 * The usual bug fixes.
6196 * Greg McGary added runtime support for bounds checking using gcc's
6197 new -fbounded-pointers option. ix86 target is complete. PowerPC
6200 * Thorsten Kukuk added secure mode support to nscd.
6202 * The Berkeley db libraries have been removed.
6204 Related, the nss_db module is now in a separate package since it
6205 obviously requires a database library being available.
6207 * Wide character I/O streams implemented by Ulrich Drepper.
6209 * Functions from the extended socket API added by Ulrich Drepper.
6211 * Functions feenableexcept and fedisableexcept to control the
6212 behaviour of individual exceptions have been added by Andreas Jaeger.
6214 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6216 * The resolver code has been updated from bind 8.2.3-T5B which supports
6217 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6220 This change could in some situations effect backward compatibility. Since
6221 now `_res' is a thread-local instead of a global variable, modifying it
6222 in one thread does not have any effect in other threads.
6224 The resolver library was also extended to allow IPv6 as the transport
6225 protocol for the requests. This work was done by Stig Venaas.
6227 * Compatibility code for K&R C compilers has been removed from the
6228 header files. A ISO C compiler is needed to use the library
6229 (conforming to either C89 or C99 standard).
6231 * Complete rewrite of the localedef program to support multibyte character
6232 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6233 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6234 Implemented by Ulrich Drepper.
6236 Bruno Haible significantly improved the generation and use of the data
6237 structures for the wide character tables.
6239 * Plural handling in gettext implemented by Ulrich Drepper.
6241 * The utmp daemon has been removed.
6243 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6245 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6248 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6250 * POSIX barriers implemented by Kaz Kylheku.
6252 * POSIX spawn function family implemented by Ulrich Drepper.
6254 * POSIX spinlocks are now available.
6256 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6258 * the configure option --enable-kernel=X.Y.Z allows to strip out
6259 compatibility for kernel versions before X.Y.Z. This is currently only
6260 implemented for Linux.
6262 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6263 field sin6_scope_id. This means that all programs using IPv6 should be
6264 recompiled. Don't expect binary compatibility with previous glibc
6267 * various conversion modules for IBM character sets contributed by
6270 * IA-64 port by Jes Sorensen and HJ Lu.
6284 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6286 * New xdr functions are added; some rpc functions are now 64bit clean.
6288 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6290 * Fixed known incompatibilities with glibc 2.0.
6292 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6294 * Optimized a number of functions (especially the ELF dynamic loader).
6296 * Update timezone data files.
6298 * lots of charmaps corrections
6300 * some new locale definitions and charmaps
6305 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6306 conform to POSIX member type requirements. Symbol versions have been
6307 adjusted as needed within the library, and for direct use by applications,
6308 but there is potential for problems if third-party libraries use
6309 struct timeval as part of their interface. This does not present
6310 a problem for X and other "essential" system libraries.
6312 * An additional locale model to support C++ Standard Library locale
6313 model and probably more was implemented by Ulrich Drepper.
6315 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6318 * Miles Bader provided the `argp' function family to support hierachical
6319 command line argument parsing, layered on top of getopt.
6321 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6323 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6326 * scanf recognizes the %a and %A format for scanning floating point numbers.
6328 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6329 information and interfaces for the available integer types.
6331 * about 130 new math functions were added to implement the ISO C9x math
6334 * the new header <complex.h> contains definitions of the complex math
6335 functions from ISO C 9X.
6337 * the new header <tgmath.h> defines generic macros to use complex or
6338 real valued functions.
6340 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6342 * Andreas Jaeger provided a test suite for the math library.
6344 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6346 * Ulrich Drepper added character set conversion functions (iconv).
6348 * Optimized string functions have been added.
6350 * The localedata addon is now part of glibc.
6352 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6354 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6355 daemon for NSS (nscd).
6357 Missing a better place here are some numbers on improvements. Under
6358 Linux 2.1.125 un-tar-ing the kernel sources takes
6362 using local files 12.19s 6.88s 22.91s
6364 using NIS 13.92s 8.91s 26.34s
6366 using NIS & nscd 10.37s 7.34s 25.30s
6368 using NIS+ 27.57s 30.37s 640.46s
6370 using NIS+ & nscd 10.25s 7.83s 26.51s
6372 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6374 Keep in mind that non-namelookup related operations dominate above times.
6375 It was just a common complain that using NIS+ unpacking the kernel is
6378 [1] The old nscd implementation is not available anymore since it was
6379 distributed with glibc up to version 2.0.98 and thus is now replaced.
6381 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6383 * Mark Kettenis provided a Hesiod NSS module.
6385 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6386 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6388 * rcmd can now handle netgroups (Dick Streefland).
6390 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6393 * Support for the IPv6 protocol has been added to the socket API, as per the
6394 latest draft standards.
6396 * Support for Linux 2.2 has been added.
6398 * Interface changes relative to the latest 2.0.x release:
6399 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6400 addseverity NEW: Unix98
6401 alphasort64 NEW: LFS
6402 argp_err_exit_status NEW: argp, GNU ext
6403 argp_error NEW: argp, GNU ext
6404 argp_failure NEW: argp, GNU ext
6405 argp_help NEW: argp, GNU ext
6406 argp_parse NEW: argp, GNU ext
6407 argp_program_bug_address NEW: argp, GNU ext
6408 argp_program_version NEW: argp, GNU ext
6409 argp_program_version_hook NEW: argp, GNU ext
6410 argp_state_help NEW: argp, GNU ext
6411 argp_usage NEW: argp, GNU ext
6412 authdes_create NEW: Secure RPC
6413 authdes_getucred NEW: Secure RPC
6414 authdes_pk_create NEW: Secure RPC
6415 backtrace NEW: GNU ext.
6416 backtrace_symbols NEW: GNU ext.
6417 backtrace_symbols_fd NEW: GNU ext.
6419 cacosf NEW: ISO C 9x
6420 cacosh NEW: ISO C 9x
6421 cacoshf NEW: ISO C 9x
6422 cacoshl NEW: ISO C 9x
6423 cacosl NEW: ISO C 9x
6430 casinf NEW: ISO C 9x
6431 casinh NEW: ISO C 9x
6432 casinhf NEW: ISO C 9x
6433 casinhl NEW: ISO C 9x
6434 casinl NEW: ISO C 9x
6436 catanf NEW: ISO C 9x
6437 catanh NEW: ISO C 9x
6438 catanhf NEW: ISO C 9x
6439 catanhl NEW: ISO C 9x
6440 catanl NEW: ISO C 9x
6441 cbc_crypt NEW: Secure RPC
6445 ccoshf NEW: ISO C 9x
6446 ccoshl NEW: ISO C 9x
6452 cimagf NEW: ISO C 9x
6453 cimagl NEW: ISO C 9x
6454 clearerr_locked REMOVED
6455 clntunix_create NEW: sunrpc ext
6457 clog10 NEW: ISO C 9x
6458 clog10f NEW: ISO C 9x
6459 clog10l NEW: ISO C 9x
6469 cprojf NEW: ISO C 9x
6470 cprojl NEW: ISO C 9x
6472 crealf NEW: ISO C 9x
6473 creall NEW: ISO C 9x
6478 csinhf NEW: ISO C 9x
6479 csinhl NEW: ISO C 9x
6482 csqrtf NEW: ISO C 9x
6483 csqrtl NEW: ISO C 9x
6487 ctanhf NEW: ISO C 9x
6488 ctanhl NEW: ISO C 9x
6490 des_setparity NEW: Secure RPC
6491 ecb_crypt NEW: Secure RPC
6492 endutxent NEW: Unix98
6494 exp10f NEW: ISO C 9x
6495 exp10l NEW: ISO C 9x
6499 fattach NEW: STREAMS
6500 fdetach NEW: STREAMS
6504 feclearexcept NEW: ISO C 9x
6505 fegetenv NEW: ISO C 9x
6506 fegetexceptflag NEW: ISO C 9x
6507 fegetround NEW: ISO C 9x
6508 feholdexcept NEW: ISO C 9x
6510 feraiseexcept NEW: ISO C 9x
6511 ferror_locked REMOVED
6512 fesetenv NEW: ISO C 9x
6513 fesetexceptflag NEW: ISO C 9x
6514 fesetround NEW: ISO C 9x
6515 fetestexcept NEW: ISO C 9x
6516 feupdateenv NEW: ISO C 9x
6517 fflush_locked REMOVED
6521 fgets_unlocked NEW: GNU ext.
6522 fileno_locked REMOVED
6534 fputc_locked REMOVED
6535 fputs_unlocked NEW: GNU ext.
6536 fread_unlocked NEW: GNU ext.
6541 fstatvfs NEW: Unix98
6545 ftruncate64 NEW: LFS
6547 fwrite_unlocked NEW: GNU ext.
6548 gai_strerror NEW: IPv6
6552 getchar_locked REMOVED
6554 getdate_err NEW: Unix98
6555 getdate_r NEW: GNU ext.
6557 getnameinfo NEW: IPv6
6558 getnetname NEW: Secure RPC
6559 getpmsg NEW: STREAMS
6560 getpt NEW: Unix98 PTY
6561 getrlimit64 NEW: LFS
6562 getutxent NEW: Unix98
6563 getutxid NEW: Unix98
6564 getutxline NEW: Unix98
6565 glob64 NEW: GNU ext.
6566 globfree64 NEW: GNU ext.
6567 gnu_get_libc_release NEW: GNU ext.
6568 gnu_get_libc_version NEW: GNU ext.
6569 grantpt NEW: Unix98 PTY
6570 host2netname NEW: Secure RPC
6572 iconv_close NEW: iconv
6573 iconv_open NEW: iconv
6574 if_freenameindex NEW: IPv6
6575 if_indextoname NEW: IPv6
6576 if_nameindex NEW: IPv6
6577 if_nametoindex NEW: IPv6
6578 in6addr_any NEW: IPv6
6579 in6addr_loopback NEW: IPv6
6580 inet6_isipv4mapped NEW: IPv6
6581 isastream NEW: STREAMS
6582 iswblank NEW: GNU ext.
6583 key_decryptsession NEW: Secure RPC
6584 key_decryptsession_pk NEW: Secure RPC
6585 key_encryptsession NEW: Secure RPC
6586 key_encryptsession_pk NEW: Secure RPC
6587 key_gendes NEW: Secure RPC
6588 key_get_conv NEW: Secure RPC
6589 key_secretkey_is_set NEW: Secure RPC
6590 key_setnet NEW: Secure RPC
6591 key_setsecret NEW: Secure RPC
6592 llrint NEW: ISO C 9x
6593 llrintf NEW: ISO C 9x
6594 llrintl NEW: ISO C 9x
6595 llround NEW: ISO C 9x
6596 llroundf NEW: ISO C 9x
6597 llroundl NEW: ISO C 9x
6602 lrintf NEW: ISO C 9x
6603 lrintl NEW: ISO C 9x
6604 lround NEW: ISO C 9x
6605 lroundf NEW: ISO C 9x
6606 lroundl NEW: ISO C 9x
6608 makecontext NEW: Unix98
6609 mempcpy NEW: GNU ext.
6612 modify_ldt NEW: kernel
6616 nearbyint NEW: ISO C 9x
6617 nearbyintf NEW: ISO C 9x
6618 nearbyintl NEW: ISO C 9x
6619 netname2host NEW: Secure RPC
6620 netname2user NEW: Secure RPC
6621 nexttoward NEW: ISO C 9x
6622 nexttowardf NEW: ISO C 9x
6623 nexttowardl NEW: ISO C 9x
6627 passwd2des NEW: Secure RPC
6629 pow10f NEW: GNU ext.
6630 pow10l NEW: GNU ext.
6633 printf_size NEW: GNU ext.
6634 printf_size_info NEW: GNU ext.
6635 profil_counter REMOVED
6636 pthread_mutexattr_getkind_np REPLACED
6637 pthread_mutexattr_setkind_np REPLACED
6638 ptsname NEW: Unix98 PTY
6639 ptsname_r NEW: Unix98 PTY
6641 putchar_locked REMOVED
6642 putgrent NEW: GNU ext.
6644 putpmsg NEW: STREAMS
6645 pututxline NEW: Unix98
6649 readdir64_r NEW: LFS
6650 remquo NEW: ISO C 9x
6651 remquof NEW: ISO C 9x
6652 remquol NEW: ISO C 9x
6654 roundf NEW: ISO C 9x
6655 roundl NEW: ISO C 9x
6657 scalbln NEW: ISO C 9x
6658 scalblnf NEW: ISO C 9x
6659 scalblnl NEW: ISO C 9x
6661 sendfile NEW: kernel
6662 setcontext NEW: Unix98
6663 setrlimit64 NEW: LFS
6664 setutxent NEW: Unix98
6666 sigignore NEW: Unix98
6667 sigqueue NEW: POSIX.1b
6668 sigrelse NEW: Unix98
6669 sigset NEW: POSIX.1b
6670 sigtimedwait NEW: POSIX.1b
6671 sigwaitinfo NEW: POSIX.1b
6672 sincos NEW: GNU ext.
6673 sincosf NEW: GNU ext.
6674 sincosl NEW: GNU ext.
6678 strcasestr NEW: GNU ext.
6679 strtoimax NEW: ISO C 9x
6680 strtoumax NEW: ISO C 9x
6681 strverscmp NEW: GNU ext.
6682 svcauthdes_stats NEW: Secure RPC
6683 svcunix_create NEW: sunrpc etx
6684 svcunixfd_create NEW: sunrpc ext
6685 swapcontext NEW: Unix98
6686 tcgetsid NEW: Unix98 PTY
6687 tdestroy NEW: GNU ext.
6688 tgamma NEW: ISO C 9x
6689 tgammaf NEW: ISO C 9x
6690 tgammal NEW: ISO C 9x
6694 truncf NEW: ISO C 9x
6695 truncl NEW: ISO C 9x
6697 unlockpt NEW: Unix98 PTY
6698 updwtmpx NEW: Unix98
6699 user2netname NEW: Secure RPC
6700 utmpxname NEW: Unix98
6701 versionsort NEW: GNU ext.
6702 versionsort64 NEW: GNU ext.
6704 wcscasecmp NEW: GNU ext.
6705 wcsncasecmp NEW: GNU ext.
6706 wcsnlen NEW: GNU ext.
6707 wcstoimax NEW: ISO C 9x
6708 wcstoll NEW: ISO C 9x
6709 wcstoull NEW: ISO C 9x
6710 wcstoumax NEW: ISO C 9x
6712 wordexp NEW: POSIX.2
6713 wordfree NEW: POSIX.2
6714 write_profiling REMOVED
6715 xdecrypt NEW: Secure RPC
6716 xdr_authdes_cred NEW: Secure RPC
6717 xdr_authdes_verf NEW: Secure RPC
6718 xdr_cryptkeyarg NEW: Secure RPC
6719 xdr_cryptkeyarg2 NEW: Secure RPC
6720 xdr_cryptkeyres NEW: Secure RPC
6721 xdr_getcredres NEW: Secure RPC
6722 xdr_key_netstarg NEW: Secure RPC
6723 xdr_key_netstres NEW: Secure RPC
6724 xdr_keybuf NEW: Secure RPC
6725 xdr_keystatus NEW: Secure RPC
6726 xdr_netnamestr NEW: Secure RPC
6727 xdr_sizeof NEW: Secure RPC
6728 xdr_unixcred NEW: sunrpc ext
6729 xencrypt NEW: Secure RPC
6730 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6741 * inet_ntoa is thread-safe
6743 * updwtmp is moved from libutil to libc
6745 * rewrite of cbrt function
6747 * update of timezone data
6761 * add atoll function
6763 * fix complex problems in Berkeley DB code
6765 * fix math functions
6769 * fixed lots of header problems (especially Linux/GNU specific)
6771 * dynamic loader preserves all registers
6773 * Roland McGrath provided support for handling of auxiliary objects in
6774 the ELF dynamic loader.
6776 * support for parallel builds is improved
6780 * GNU extensions are no longer declared by default. To enable them you
6781 must define the macro `_GNU_SOURCE' in your program or compile with
6784 * The library has changed from using GNU ld symbol aliases to using weak
6785 symbols where available. The ELF object file format supports weak
6786 symbols; GNU ld also supports weak symbols in the a.out format. (There
6787 is also now support for other GNU ld extensions in ELF. Use the
6788 `--with-elf' option to configure to indicate you have ELF, and
6789 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6790 of many files which contained only symbol aliases, reducing the size of
6791 the source and the compiled library; many other files were renamed to
6792 less cryptic names previously occupied by the symbol alias files.
6793 There is a new header file <elf.h> for programs which operate on
6794 files in the ELF format.
6796 * Converted to Autoconf version 2, so `configure' has more options.
6797 Run `configure --help' to see the details.
6799 * The library can now be configured to build profiling, highly-optimized
6800 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6801 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6802 `configure' enable building these extra libraries. The shared library is
6803 built by default when using both ELF and GNU ld. When shared libraries
6804 are enabled, the new library `-ldl' is available for arbitrary run-time
6805 loading of shared objects; its interface is defined in <dlfcn.h>. The
6806 new header file <link.h> gives access to the internals of the run-time
6807 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6808 application of same name on other systems and it provides information
6809 about dynamically linked binaries.
6811 * The C library now provides the run-time support code for profiling
6812 executables compiled with `-pg'. Programs can control the profiling code
6813 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6814 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6815 the support for this file format was contributed by David Mosberger-Tang.
6817 * The math code has been replaced with a math library based on fdlibm from
6818 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6819 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6820 functions. The math functions now reside in a separate library, so
6821 programs using them will need to use `-lm' their linking commands.
6823 * John C. Bowman contributed optimized ix87 assembler inline functions.
6825 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6826 mechanism similar to that found in Solaris 2. This is now used for the
6827 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6828 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6829 file controls what services are used for each individual database. This
6830 works by loading shared libraries with names specified in `nsswitch.conf',
6831 so service modules can be changed or added at any time without even
6832 relinking any program. Currently there are the file, db, and NIS based
6833 NSS services available.
6835 * The new functions `strtoq' and `strtouq' parse integer values from
6836 strings, like `strtol' and `strtoul', but they return `long long int' and
6837 `unsigned long long int' values, respectively (64-bit quantities).
6839 * The new functions `strtof' and `strtold' parse floating-point values from
6840 strings, like `strtod', but they return `float' and `long double' values,
6841 respectively (on some machines `double' and `long double' are the same).
6843 * Ulrich Drepper has contributed new implementations of the floating-point
6844 printing and reading code used in the `printf' family of functions and
6845 `strtod', `strtof', and `strtold'. These new functions are perfectly
6846 accurate, and much faster than the old ones.
6848 * The implementation of the POSIX locale model was completely rewritten by
6849 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6850 to compile the POSIX locale definition.
6852 * The former dummy implementations of the strcoll and strxfrm function are
6853 now replaced by fully functional code contributed by Ulrich Drepper. The
6854 collation information comes from the POSIX locale definitions.
6856 * The new header <langinfo.h> defines an interface for accessing
6857 various locale-dependent data (using the locale chosen with `setlocale').
6859 * Ulrich Drepper has contributed a new suite of functions for operation on
6860 wide-character and multibyte-character strings, in <wchar.h>;
6861 and classification and case conversion of wide characters, in <wctype.h>.
6862 These new functions are conforming to the ISO C, Amendement 1 specification.
6864 * There is now a second implementation of the standard I/O library available.
6865 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6866 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6868 * You can now use positional parameter specifications in format strings
6869 for the `printf' and `scanf' families of functions. For example,
6870 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6871 ``Number 6, Mr Jones''. This is mainly useful when providing different
6872 format strings for different languages, whose grammars may dictate
6873 different orderings of the values being printed. To support this
6874 feature, the interface for `register_printf_handler' has changed; see
6875 the header file <printf.h> for details.
6877 * The `printf' and `scanf' families of functions now understand a new
6878 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6879 to group numbers as indicated by the locale; for `scanf' and friends, this
6880 says to accept as valid only a number with all the proper grouping
6881 separators in the right places. In the default "C" locale, numbers are
6882 not grouped; but locales for specific countries will define the usual
6883 conventions (i.e. separate thousands with `,' in the US locale).
6885 * The pgrp functions have been regularized, slightly incompatibly but much
6886 less confusingly. The core functions are now `getpgid' and `setpgid',
6887 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6888 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6889 provided for compatibility. There is no longer an incompatible `getpgrp'
6890 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6892 * The new header file <fts.h> and suite of functions simplify programs that
6893 operate on directory trees. This code comes from 4.4 BSD.
6895 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6896 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6897 NSS scheme used in glibc.
6899 * There is a new malloc debugging hook `__memalign_hook'.
6901 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6902 `unsigned int' in <sys/types.h>. These are for compatibility only and
6903 their use is discouraged.
6905 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6906 done differently, so that it works even without GNU ld.
6908 * New function `euidaccess' checks allowed access to a file like `access',
6909 but using the effective IDs instead of the real IDs.
6911 * The time zone data files have been updated for the latest and greatest
6912 local time conventions of the countries of the world.
6914 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6917 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6918 for formatting floating-point numbers. They are provided only for
6919 compatibility; new programs should use `sprintf' instead. There are
6920 also equivalent function for the `long double' floating-point type and
6921 all functions also exist in a reentrant form.
6923 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6924 functions for maintaining the login-record files (primarily of use to
6925 system programs such as `login'), and convenient functions for
6926 allocating and initializing a pseudo-terminal (pty) device.
6928 * Ulrich Drepper has contributed new support for System V style
6929 shared memory and IPC on systems that support it.
6931 * Ulrich Drepper has contributed several miscellaneous new functions found
6932 in System V: The `hsearch' family of functions provide an effective
6933 implementation of hash tables; `a64l' and `l64a' provide a very simple
6934 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6937 * Ulrich Drepper has contributed new reentrant counterparts for the
6938 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6940 * Ulrich Drepper has contributed new, highly-optimized versions of several
6941 string functions for the i486/Pentium family of processors.
6943 * Ulrich Drepper has updated the Linux-specific code, based largely
6944 on work done in Hongjiu Lu's version of GNU libc for Linux.
6945 The GNU library now supports Linux versions 2.0.10 and later,
6946 using the ELF object file format (i[3456]86-*-linux).
6948 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6950 * David Mosberger-Tang and Richard Henderson have ported the C library
6951 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6952 dynamic linking support for ELF/Alpha.
6954 * Richard Henderson contributed several Alpha optimized assembler function
6955 for arithmetic and string handling.
6957 * Ulrich Drepper has contributed a new set of message catalog functions to
6958 support multiple languages using the <libintl.h> interface, for use with
6959 his new package GNU gettext. Translation volunteers have contributed
6960 catalogs of the library's messages in Spanish, German, and Korean.
6962 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6963 program and the `catgets' function for reading the catalog files it
6964 creates. (The <libintl.h> interface is preferred; we include the
6965 <nl_types.h> interface using `catgets' only for source compatibility with
6966 programs already written to use it.)
6968 * New header file <values.h> gives SVID-compatible names for <limits.h>
6971 * Various new macros, declarations, and small header files for compatibility
6974 * New function `group_member' is a convenient way to check if a process has
6975 a given effective group ID.
6977 * When using GCC 2.7 and later, the socket functions are now declared in a
6978 special way so that passing an argument of type `struct sockaddr_in *',
6979 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6980 `struct sockaddr *' type, does not generate a type-clash warning.
6982 * New function `error' declared in header file <error.h> is a convenient
6983 function for printing error messages and optionally exiting; this is the
6984 canonical function used in GNU programs. The new functions `err', `warn',
6985 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6986 doing the same thing.
6988 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6989 POSIX.2 `glob' function to do ~ and {...} expansion.
6991 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6992 `clearenv' which is used in POSIX.9 is also available.
6994 * New function `getsid' returns session ID number on systems that support it.
6996 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6997 files <db.h> and <mpool.h> provide a rich set of functions for several
6998 types of simple databases stored in memory and in files, and <ndbm.h> is
6999 an old `ndbm'-compatible interface using the `db' functions. Link with
7000 `-ldb' to get these functions.
7002 * New macro `strdupa' copies a string like `strdup', but uses local stack
7003 space from `alloca' instead of dynamic heap space from `malloc'.
7005 * New function `strnlen' is like `strlen' but searches only a given maximum
7006 number of characters for the null terminator. `stpncpy', `strndup' and
7007 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
7010 * New function `statfs' in header <sys/statfs.h>.
7012 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
7013 provide convenient functions for operating on blocks of null-terminated
7016 * A new suite of functions in <utmp.h> handle all the details of reading
7017 and writing the utmp file.
7019 * An implementation of the NIS/YP(tm) based NSS service was contributed by
7022 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
7023 completely POSIX compliant and also implemented the extended functionality
7024 to handle alternate digit representation and alternate era date formats.
7026 * Ulrich Drepper provided an implementation of the `strptime' function
7027 defined in XPG4.2 which transforms a string into a `struct tm' value.
7029 * Paul Eggert provided the tzselect shell script as part of the timezone
7030 code. The shell script makes it easy to select the correct timezone
7033 * The implementation of the malloc family of functions is completely replaced
7034 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
7035 The implementation uses the mmap function (if available) and it is
7036 optimized for the use in multi threaded programs.
7038 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
7039 functions. This new functionality is usable by specifying a special
7040 salt string and it is compatible with implementation on *BSD systems.
7042 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
7043 `getsubopt' to handle second level command line options, `bsd_signal'
7044 to access BSD style `signal' functionality, the obsolete `regexp' style
7047 * the `lchown' function is available on system which support this
7050 * The implementation of the shadow password handling function was contributed
7053 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
7055 * POSIX.1g support was added. The <sys/select.h> header is available,
7056 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
7057 implementation of `getaddrinfo'.
7061 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
7063 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
7064 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
7066 * The new function `daemon' from 4.4 BSD is useful for server programs that
7067 want to put themselves in the background.
7069 * Joel Sherrill has contributed support for several standalone boards that
7070 run without an operating system.
7072 * `printf', `scanf' and friends now accept a `q' type modifier for long
7073 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
7075 * All of the code taken from BSD (notably most of the math and networking
7076 routines) has been updated from the BSD 4.4-Lite release.
7078 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
7080 * The new functions `getdomainname' and `setdomainname' fetch or change the
7081 YP/NIS domain name. These are system calls which exist on systems which
7084 * The time zone data files have been updated for the latest international
7087 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
7088 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
7092 * The C library now includes support for Sun RPC, from Sun's free
7093 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
7094 are included. (There is still no support for YP.)
7096 * Tom Quinn has contributed a port of the C library to SGI machines running
7097 Irix 4 (mips-sgi-irix4).
7099 * The new `lockf' function is a simplified interface to the locking
7100 facilities of `fcntl', included for compatibility.
7102 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
7104 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
7106 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
7109 * The error message printed by `assert' for a failed assertion now includes
7110 the name of the program (if using GNU ld) and the name of the calling
7111 function (with versions of GCC that support this).
7113 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
7115 * The library now includes the <sys/mman.h> header file and memory
7116 management functions `mmap', `munmap', `mprotect', `msync', and
7117 `madvise', on systems that support those facilities.
7119 * The interface for `mcheck' has changed slightly: the function called to
7120 abort the program when an allocation inconsistency is detected now takes
7121 an argument that indicates the type of failure. The new function
7122 `mprobe' lets you request a consistency check for a particular block at
7123 any time (checks are normally done only when you call `free' or `realloc'
7126 * It is now possible to easily cross-compile the C library, building on one
7127 system a library to run on another machine and/or operating system. All
7128 you need to do is set the variable `HOST_CC' in `configparms' to the
7129 native compiler for programs to run on the machine you are building on (a
7130 few generator programs are used on Unix systems); set `CC' to the
7133 * The new function `fexecve' (only implemented on the GNU system) executes
7134 a program file given a file descriptor already open on the file.
7138 * Brendan Kehoe has contributed most of a port to the DEC Alpha
7139 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
7141 * You can set the variable `libprefix' in `configparms' to specify a prefix
7142 to be prepended to installed library files; this makes it easy to install
7143 the GNU C library to be linked as `-lgnuc' or whatever.
7145 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
7146 copies a limited number of characters from a string, and returns the
7147 address of the last character written.
7149 * You no longer need to check for whether the installed `stddef.h' is
7150 compatible with the GNU C library. configure now checks for you.
7152 * You can now define a per-stream `fileno' function to convert the
7153 stream's cookie into an integral file descriptor.
7155 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7156 allocates zero bytes of storage, and returns a unique pointer which
7157 you can pass to `realloc' or `free'. The behavior is undefined if
7158 you dereference this pointer.
7160 * The C library now runs on Sony NEWS m68k machines running either
7161 NewsOS 3 or NewsOS 4.
7163 * The new `syscall' function is a system-dependent primitive function
7164 for invoking system calls. It has the canonical behavior on Unix
7165 systems, including unreliable return values for some calls (such as
7166 `pipe', `fork' and `getppid').
7168 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7169 to `EAGAIN', which is the preferred name. On systems whose kernels
7170 use two distinct codes, the C library now translates EWOULDBLOCK to
7171 EAGAIN in every system call function.
7175 * The GNU C Library Reference Manual is now distributed with the library.
7176 `make dvi' will produce a DVI file of the printed manual.
7177 `make info' will produce Info files that you can read on line using C-h i
7178 in Emacs or the `info' program.
7179 Please send comments on the manual to bug-glibc-manual@gnu.org.
7181 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7183 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7185 * Jason Merrill has contributed a port to the Sequent Symmetry running
7186 Dynix version 3 (i386-sequent-dynix).
7188 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7189 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7191 * New function `memory_warnings' lets you arrange to get warnings when
7192 malloc is running out of memory to allocate, like Emacs gives you.
7194 * The C library now contains the relocating allocator used in Emacs 19 for
7195 its editing buffers. This allocator (ralloc) minimizes allocation
7196 overhead and fragmentation by moving allocated regions around whenever it
7197 needs to. You always refer to a ralloc'd region with a "handle" (a
7198 pointer to a pointer--an object of type `void **').
7200 * There is a new `printf' format: `%m' gives you the string corresponding
7201 to the error code in `errno'.
7203 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7204 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7205 pass, the `a' modifier says to fill in a `char **' you pass with a
7208 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7209 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7210 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7212 * `mkstemp' is a traditional Unix function to atomically create and open a
7213 uniquely-named temporary file.
7217 * The standard location for the file that says what the local timezone is
7218 has changed again. It is now `/usr/local/etc/localtime' (or more
7219 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7221 * The distribution no longer contains any files with names longer than 14
7224 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7225 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7227 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7231 * The configuration process has changed quite a bit. The `configure'
7232 script is now used just like the configuration scripts for other GNU
7233 packages. The `sysdeps' directory hierarchy is much rearranged.
7234 The file `INSTALL' explains the new scheme in detail.
7236 * The header files no longer need to be processed into ANSI C and
7237 traditional C versions. There is just one set of files to install, and
7238 it will work with ANSI or old C compilers (including `gcc -traditional').
7240 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7241 MIPS DECStation running Ultrix 4.
7243 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7244 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7245 made itself into a shared library.
7247 * Yet further improved support for the i386, running 4.3 BSD-like systems
7248 (such as Mach 3 with the Unix single-server), or System V.
7250 * New function `strncasecmp' to do case-insensitive string comparison
7251 with limited length.
7253 * New function `strsep' is a reentrant alternative to `strtok'.
7255 * New functions `scandir' and `alphasort' for searching directories.
7257 * New function `setenv' is a better interface to `putenv'.
7259 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7260 function for traversing a directory tree.
7262 * The GNU obstack package is now also part of the C library.
7263 The new function `open_obstack_stream' creates a stdio stream that
7264 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7265 formatted output directly to an obstack.
7267 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7268 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7270 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7272 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7273 things to your strings.
7275 * There are some new test programs: test-fseek, testmb, and testrand.
7277 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7278 These ports are not finished, but are a good starting place for really
7279 supporting those systems.
7281 * `/etc/localtime' is now the standard location for the file that says what
7282 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7283 This follows the general principle that `/etc' is the place for all local
7284 configuration files.
7286 * The C library header files now use `extern "C"' when used by the C++
7287 compiler, so the C library should now work with C++ code.
7289 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7290 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7293 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7294 function which uses the `merge sort' algorithm, and is said to be
7295 significantly faster than the old GNU `qsort' function. Merge sort is
7296 now the standard `qsort' function. The new algorithm can require a lot
7297 of temporary storage; so, the old sorting function is called when the
7298 required storage is not available.
7300 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7301 provides the Unix `crypt' function, plus some other entry points.
7303 * The code and header files taken from 4.4 BSD have been updated with the
7304 latest files released from Berkeley.
7306 ----------------------------------------------------------------------
7309 Permission is granted to anyone to make or distribute verbatim copies
7310 of this document as received, in any medium, provided that the
7311 copyright notice and this permission notice are preserved,
7312 thus giving the recipient permission to redistribute in turn.
7314 Permission is granted to distribute modified versions
7315 of this document, or of portions of it,
7316 under the above conditions, provided also that they
7317 carry prominent notices stating who last changed them.
7320 version-control: never