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linux: Add tst-mount to check for Linux new mount API

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The new mount API was added on Linux 5.2 with six new syscalls:
fsopen, fsconfig, fsmount, move_mount, fspick, and open_tree.

The new test verifies minimal functionality along with error paths
for specific arguments and their corner cases.

Checked on x86_64-linux-gnu.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Adhemerval Zanella 2022-06-24 16:59:18 -03:00
parent 78a408ee7b
commit c3b02b6567
2 changed files with 96 additions and 0 deletions
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1
sysdeps/unix/sysv/linux/Makefile
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@ -130,6 +130,7 @@ tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
tst-getauxval \
tst-pidfd \
tst-process_mrelease \
tst-mount \
# tests
# process_madvise requires CAP_SYS_ADMIN.

95
sysdeps/unix/sysv/linux/tst-mount.c Normal file
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@ -0,0 +1,95 @@
/* Basic tests for the new Linux API added on Linux 5.2.
Copyright (C) 2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <support/check.h>
#include <support/xunistd.h>
#include <support/namespace.h>
#include <sys/wait.h>
#include <sys/mount.h>
static void
subprocess (void)
{
int r = fsopen ("it_should_be_not_a_valid_mount", 0);
TEST_VERIFY_EXIT (r == -1);
if (errno == ENOSYS)
FAIL_UNSUPPORTED ("kernel does not support new mount API, skipping test");
TEST_COMPARE (errno, ENODEV);
int fd = fsopen ("tmpfs", FSOPEN_CLOEXEC);
TEST_VERIFY (fd != -1);
TEST_COMPARE (fsconfig (-1, FSCONFIG_SET_STRING, "size", "2048", 0), -1);
TEST_COMPARE (errno, EINVAL);
{
int r = fsconfig (fd, FSCONFIG_SET_STRING, "size", "2048", 0);
TEST_VERIFY (r != -1);
r = fsconfig (fd, FSCONFIG_CMD_CREATE, NULL, NULL, 0);
TEST_VERIFY (r != -1);
}
TEST_COMPARE (fsmount (-1, FSMOUNT_CLOEXEC, MOUNT_ATTR_NODEV), -1);
TEST_COMPARE (errno, EBADF);
int mfd = fsmount (fd, FSMOUNT_CLOEXEC, MOUNT_ATTR_NODEV);
TEST_VERIFY (mfd != -1);
TEST_COMPARE (move_mount (-1, "", AT_FDCWD, "/tmp", 0), -1);
TEST_COMPARE (errno, ENOENT);
{
int r = move_mount (mfd, "", AT_FDCWD, "/tmp", MOVE_MOUNT_F_EMPTY_PATH);
TEST_VERIFY (r != -1);
}
TEST_COMPARE (fspick (AT_FDCWD, "", 0), -1);
TEST_COMPARE (errno, ENOENT);
{
int pfd = fspick (AT_FDCWD, "/tmp", FSPICK_CLOEXEC);
TEST_VERIFY (pfd != -1);
}
TEST_COMPARE (open_tree (AT_FDCWD, "", 0), -1);
TEST_COMPARE (errno, ENOENT);
{
int fd_tree = open_tree (AT_FDCWD, "/tmp",
OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC);
TEST_VERIFY (fd_tree != -1);
}
_exit (0);
}
static int
do_test (void)
{
support_become_root ();
pid_t pid = xfork ();
if (pid == 0)
subprocess ();
int status;
xwaitpid (pid, &status, 0);
TEST_VERIFY (WIFEXITED (status));
return 0;
}
#include <support/test-driver.c>