sysdeps/unix/sysv/linux/tst-mount.c

   1 /* Basic tests for the new Linux API added on Linux 5.2.
   2    Copyright (C) 2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If
  17    not, see <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <support/check.h>
  21 #include <support/xunistd.h>
  22 #include <support/namespace.h>
  23 #include <sys/mount.h>
  24
  25 _Static_assert (sizeof (struct mount_attr) == MOUNT_ATTR_SIZE_VER0,
  26                 "sizeof (struct mount_attr) != MOUNT_ATTR_SIZE_VER0");
  27
  28 static int
  29 do_test (void)
  30 {
  31   support_become_root ();
  32   if (!support_enter_mount_namespace ())
  33     FAIL_UNSUPPORTED ("cannot enter mount namespace, skipping test");
  34
  35   int r = fsopen ("it_should_be_not_a_valid_mount", 0);
  36   TEST_VERIFY_EXIT (r == -1);
  37   if (errno == ENOSYS)
  38     FAIL_UNSUPPORTED ("kernel does not support new mount API, skipping test");
  39   TEST_COMPARE (errno, ENODEV);
  40
  41   int fd = fsopen ("tmpfs", FSOPEN_CLOEXEC);
  42   TEST_VERIFY (fd != -1);
  43
  44   TEST_COMPARE (fsconfig (-1, FSCONFIG_SET_STRING, "size", "2048", 0), -1);
  45   TEST_COMPARE (errno, EINVAL);
  46
  47   {
  48     int r = fsconfig (fd, FSCONFIG_SET_STRING, "size", "2048", 0);
  49     TEST_VERIFY (r != -1);
  50     r = fsconfig (fd, FSCONFIG_CMD_CREATE, NULL, NULL, 0);
  51     TEST_VERIFY (r != -1);
  52   }
  53
  54   TEST_COMPARE (fsmount (-1, FSMOUNT_CLOEXEC, MOUNT_ATTR_NODEV), -1);
  55   TEST_COMPARE (errno, EBADF);
  56
  57   int mfd = fsmount (fd, FSMOUNT_CLOEXEC, MOUNT_ATTR_NODEV);
  58   TEST_VERIFY (mfd != -1);
  59
  60   TEST_COMPARE (move_mount (-1, "", AT_FDCWD, "/tmp", 0), -1);
  61   TEST_COMPARE (errno, ENOENT);
  62   {
  63     int r = move_mount (mfd, "", AT_FDCWD, "/tmp", MOVE_MOUNT_F_EMPTY_PATH);
  64     TEST_VERIFY (r != -1);
  65   }
  66
  67   TEST_COMPARE (fspick (AT_FDCWD, "", 0), -1);
  68   TEST_COMPARE (errno, ENOENT);
  69   {
  70     int pfd = fspick (AT_FDCWD, "/tmp", FSPICK_CLOEXEC);
  71     TEST_VERIFY (pfd != -1);
  72   }
  73
  74   TEST_COMPARE (open_tree (AT_FDCWD, "", 0), -1);
  75   TEST_COMPARE (errno, ENOENT);
  76   int fd_tree = open_tree (AT_FDCWD, "/tmp",
  77                            OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC);
  78   TEST_VERIFY (fd_tree != -1);
  79
  80   {
  81     struct mount_attr attr =
  82     {
  83       .attr_set = MOUNT_ATTR_RDONLY,
  84     };
  85      mount_setattr (fd_tree, "", AT_EMPTY_PATH, &attr,
  86                            sizeof (attr));
  87     int r = mount_setattr (fd_tree, "", AT_EMPTY_PATH, &attr,
  88                            sizeof (attr));
  89     /* New mount API was added on 5.1, but mount_setattr on 5.12.  */
  90     if (r == -1)
  91       TEST_COMPARE (errno, ENOSYS);
  92     else
  93       {
  94         TEST_COMPARE (mount_setattr (-1, "", AT_EMPTY_PATH, &attr,
  95                                      sizeof (attr)), -1);
  96         TEST_COMPARE (errno, EBADF);
  97         TEST_COMPARE (mount_setattr (fd_tree, "", AT_EMPTY_PATH, &attr,
  98                                      sizeof (attr) - 8), -1);
  99         TEST_COMPARE (errno, EINVAL);
 100       }
 101   }
 102
 103   _exit (0);
 104 }
 105
 106 #include <support/test-driver.c>