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/* Linux openat2 tests.
Copyright (C) 2024 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; if not, see
<https://www.gnu.org/licenses/>. */
/* openat2 is only support in LFS mode. */
#define _FILE_OFFSET_BITS 64
#include <array_length.h>
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <support/check.h>
#include <support/temp_file.h>
#include <support/xunistd.h>
static int dir_fd;
static void
do_prepare (int argc, char *argv[])
{
char *temp_dir = support_create_temp_directory ("tst-openat2");
dir_fd = xopen (temp_dir, O_RDONLY | O_DIRECTORY, 0);
}
#define PREPARE do_prepare
static int
do_test_struct (void)
{
static struct struct_test
{
struct open_how_ext
{
struct open_how inner;
int extra1;
int extra2;
int extra3;
} arg;
size_t size;
int err;
} tests[] =
{
{
/* Zero size. */
.arg.inner.flags = O_RDONLY,
.size = 0,
.err = EINVAL,
},
{
/* Normal struct. */
.arg.inner.flags = O_RDONLY,
.size = sizeof (struct open_how),
},
{
/* Larger struct, zeroed out the unused values. */
.arg.inner.flags = O_RDONLY,
.size = sizeof (struct open_how_ext),
},
{
/* Larger struct, non-zeroed out the unused values. */
.arg.inner.flags = O_RDONLY,
.arg.extra1 = 0xdeadbeef,
.size = sizeof (struct open_how_ext),
.err = E2BIG,
},
{
/* Larger struct, non-zeroed out the unused values. */
.arg.inner.flags = O_RDONLY,
.arg.extra2 = 0xdeadbeef,
.size = sizeof (struct open_how_ext),
.err = E2BIG,
},
};
for (struct struct_test *t = tests; t != array_end (tests); t++)
{
int fd = openat2 (AT_FDCWD, ".", (struct open_how *) &t->arg, t->size);
if (fd == -1 && errno == ENOSYS)
FAIL_UNSUPPORTED ("openat2 is not supported by the kernel");
if (t->err != 0)
{
TEST_COMPARE (fd, -1);
TEST_COMPARE (errno, t->err);
}
else
TEST_VERIFY (fd >= 0);
}
return 0;
}
static int
do_test_flags (void)
{
static struct flag_test
{
struct open_how how;
int err;
} tests[] =
{
/* O_TMPFILE is incompatible with O_PATH and O_CREAT. */
{ .how.flags = O_TMPFILE | O_PATH | O_RDWR, .err = EINVAL },
{ .how.flags = O_TMPFILE | O_CREAT | O_RDWR, .err = EINVAL },
/* O_PATH only permits certain other flags to be set ... */
{ .how.flags = O_PATH | O_CLOEXEC },
{ .how.flags = O_PATH | O_DIRECTORY },
{ .how.flags = O_PATH | O_NOFOLLOW },
/* ... and others are absolutely not permitted. */
{ .how.flags = O_PATH | O_RDWR, .err = EINVAL },
{ .how.flags = O_PATH | O_CREAT, .err = EINVAL },
{ .how.flags = O_PATH | O_EXCL, .err = EINVAL },
{ .how.flags = O_PATH | O_NOCTTY, .err = EINVAL },
{ .how.flags = O_PATH | O_DIRECT, .err = EINVAL },
/* ->mode must only be set with O_{CREAT,TMPFILE}. */
{ .how.flags = O_RDONLY, .how.mode = 0600, .err = EINVAL },
{ .how.flags = O_PATH, .how.mode = 0600, .err = EINVAL },
{ .how.flags = O_CREAT, .how.mode = 0600 },
{ .how.flags = O_TMPFILE | O_RDWR, .how.mode = 0600 },
/* ->mode must only contain 0777 bits. */
{ .how.flags = O_CREAT, .how.mode = 0xFFFF, .err = EINVAL },
{ .how.flags = O_CREAT, .how.mode = 0xC000000000000000ULL, .err = EINVAL },
{ .how.flags = O_TMPFILE | O_RDWR, .how.mode = 0x1337, .err = EINVAL },
{ .how.flags = O_TMPFILE | O_RDWR, .how.mode = 0x0000A00000000000ULL,
.err = EINVAL },
/* ->resolve flags must not conflict. */
{ .how.flags = O_RDONLY,
.how.resolve = RESOLVE_BENEATH | RESOLVE_IN_ROOT,
.err = EINVAL },
/* ->resolve must only contain RESOLVE_* flags. */
{ .how.flags = O_RDONLY,
.how.resolve = 0x1337, .err = EINVAL },
{ .how.flags = O_CREAT,
.how.resolve = 0x1337, .err = EINVAL },
{ .how.flags = O_TMPFILE | O_RDWR,
.how.resolve = 0x1337, .err = EINVAL },
{ .how.flags = O_PATH,
.how.resolve = 0x1337, .err = EINVAL },
/* currently unknown upper 32 bit rejected. */
{ .how.flags = O_RDONLY | (1ULL << 63),
.how.resolve = 0, .err = EINVAL },
};
for (struct flag_test *t = tests; t != array_end (tests); t++)
{
char *path;
if (t->how.flags & O_CREAT)
{
int temp_fd = create_temp_file ("tst-openat2.", &path);
TEST_VERIFY_EXIT (temp_fd != -1);
xunlink (path);
}
else
path = (char *) ".";
int fd = openat2 (AT_FDCWD, path, &t->how, sizeof (struct open_how));
if (fd != 0 && errno == EOPNOTSUPP)
{
/* Skip the testcase if FS does not support the operation (e.g.
valid O_TMPFILE on NFS). */
continue;
}
if (t->err != 0)
{
TEST_COMPARE (fd, -1);
TEST_COMPARE (errno, t->err);
}
else
TEST_VERIFY (fd >= 0);
}
return 0;
}
static int
do_test_basic (void)
{
int fd;
fd = openat2 (dir_fd,
"some-file",
&(struct open_how)
{
.flags = O_CREAT|O_RDWR|O_EXCL,
.mode = 0666,
},
sizeof (struct open_how));
TEST_VERIFY (fd != -1);
xwrite (fd, "hello", 5);
/* Before closing the file, try using this file descriptor to open
another file. This must fail. */
{
int fd2 = openat2 (fd,
"should-not-work",
&(struct open_how)
{
.flags = O_CREAT|O_RDWR|O_EXCL,
.mode = 0666,
},
sizeof (struct open_how));
TEST_COMPARE (fd2, -1);
TEST_COMPARE (errno, ENOTDIR);
}
/* Remove the created file. */
int cwdfd = xopen (".", O_RDONLY | O_DIRECTORY, 0);
TEST_COMPARE (fchdir (dir_fd), 0);
xunlink ("some-file");
TEST_COMPARE (fchdir (cwdfd), 0);
xclose (dir_fd);
xclose (cwdfd);
fd = openat2 (dir_fd,
"some-file",
&(struct open_how)
{
.flags = O_CREAT|O_RDWR|O_EXCL,
.mode = 0666,
},
sizeof (struct open_how));
TEST_COMPARE (fd, -1);
TEST_COMPARE (errno, EBADF);
return 0;
}
static int
do_test (void)
{
do_test_struct ();
do_test_flags ();
do_test_basic ();
return 0;
}
#include <support/test-driver.c>
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