81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2020 Linaro Limited. All rights reserved.
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* Author: Viresh Kumar <viresh.kumar@linaro.org>
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*/
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#ifndef OPENAT2_H
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#define OPENAT2_H
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#include <sys/syscall.h>
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#include <linux/types.h>
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#include "lapi/syscalls.h"
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#include "config.h"
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#ifdef HAVE_LINUX_OPENAT2_H
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <linux/openat2.h>
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#else
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/*
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* Arguments for how openat2(2) should open the target path. If only @flags and
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* @mode are non-zero, then openat2(2) operates very similarly to openat(2).
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*
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* However, unlike openat(2), unknown or invalid bits in @flags result in
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* -EINVAL rather than being silently ignored. @mode must be zero unless one of
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* {O_CREAT, O_TMPFILE} are set.
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*
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* @flags: O_* flags.
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* @mode: O_CREAT/O_TMPFILE file mode.
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* @resolve: RESOLVE_* flags.
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*/
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struct open_how {
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uint64_t flags;
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uint64_t mode;
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uint64_t resolve;
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};
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/* how->resolve flags for openat2(2). */
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#define RESOLVE_NO_XDEV 0x01 /* Block mount-point crossings
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(includes bind-mounts). */
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#define RESOLVE_NO_MAGICLINKS 0x02 /* Block traversal through procfs-style
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"magic-links". */
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#define RESOLVE_NO_SYMLINKS 0x04 /* Block traversal through all symlinks
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(implies OEXT_NO_MAGICLINKS) */
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#define RESOLVE_BENEATH 0x08 /* Block "lexical" trickery like
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"..", symlinks, and absolute
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paths which escape the dirfd. */
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#define RESOLVE_IN_ROOT 0x10 /* Make all jumps to "/" and ".."
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be scoped inside the dirfd
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(similar to chroot(2)). */
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#endif /* HAVE_LINUX_OPENAT2_H */
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#ifndef HAVE_OPENAT2
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static inline int openat2(int dfd, const char *pathname,
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struct open_how *how, size_t size)
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{
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return tst_syscall(__NR_openat2, dfd, pathname, how, size);
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}
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#endif
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struct open_how_pad {
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/* how should be kept as the first entry here */
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struct open_how how;
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uint64_t pad;
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};
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static inline void openat2_supported_by_kernel(void)
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{
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if ((tst_kvercmp(5, 6, 0)) < 0) {
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/* Check if the syscall is backported on an older kernel */
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TEST(syscall(__NR_openat2, -1, NULL, NULL, 0));
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if (TST_RET == -1 && TST_ERR == ENOSYS)
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tst_brk(TCONF, "Test not supported on kernel version < v5.6");
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}
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}
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#endif /* OPENAT2_H */
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