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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2020 Linaro Limited. All rights reserved.
* Author: Viresh Kumar <viresh.kumar@linaro.org>
*/
#ifndef OPENAT2_H
#define OPENAT2_H
#include <sys/syscall.h>
#include <linux/types.h>
#include "lapi/syscalls.h"
#include "config.h"
#ifndef HAVE_OPENAT2
/*
* Arguments for how openat2(2) should open the target path. If only @flags and
* @mode are non-zero, then openat2(2) operates very similarly to openat(2).
*
* However, unlike openat(2), unknown or invalid bits in @flags result in
* -EINVAL rather than being silently ignored. @mode must be zero unless one of
* {O_CREAT, O_TMPFILE} are set.
*
* @flags: O_* flags.
* @mode: O_CREAT/O_TMPFILE file mode.
* @resolve: RESOLVE_* flags.
*/
struct open_how {
uint64_t flags;
uint64_t mode;
uint64_t resolve;
};
/* how->resolve flags for openat2(2). */
#define RESOLVE_NO_XDEV 0x01 /* Block mount-point crossings
(includes bind-mounts). */
#define RESOLVE_NO_MAGICLINKS 0x02 /* Block traversal through procfs-style
"magic-links". */
#define RESOLVE_NO_SYMLINKS 0x04 /* Block traversal through all symlinks
(implies OEXT_NO_MAGICLINKS) */
#define RESOLVE_BENEATH 0x08 /* Block "lexical" trickery like
"..", symlinks, and absolute
paths which escape the dirfd. */
#define RESOLVE_IN_ROOT 0x10 /* Make all jumps to "/" and ".."
be scoped inside the dirfd
(similar to chroot(2)). */
int openat2(int dfd, const char *pathname, struct open_how *how, size_t size)
{
return tst_syscall(__NR_openat2, dfd, pathname, how, size);
}
#endif
struct open_how_pad {
/* how should be kept as the first entry here */
struct open_how how;
uint64_t pad;
};
void openat2_supported_by_kernel(void)
{
if ((tst_kvercmp(5, 6, 0)) < 0) {
/* Check if the syscall is backported on an older kernel */
TEST(syscall(__NR_openat2, -1, NULL, NULL, 0));
if (TST_RET == -1 && TST_ERR == ENOSYS)
tst_brk(TCONF, "Test not supported on kernel version < v5.6");
}
}
#endif /* OPENAT2_H */
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