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106 lines
3.4 KiB
106 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Author: Aleksa Sarai <[email protected]> |
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* Copyright (C) 2018-2019 SUSE LLC. |
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*/ |
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#ifndef __RESOLVEAT_H__ |
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#define __RESOLVEAT_H__ |
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#define _GNU_SOURCE |
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#include <stdint.h> |
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#include <errno.h> |
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#include <linux/types.h> |
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#include "../kselftest.h" |
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#define ARRAY_LEN(X) (sizeof (X) / sizeof (*(X))) |
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#define BUILD_BUG_ON(e) ((void)(sizeof(struct { int:(-!!(e)); }))) |
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#ifndef SYS_openat2 |
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#ifndef __NR_openat2 |
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#define __NR_openat2 437 |
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#endif /* __NR_openat2 */ |
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#define SYS_openat2 __NR_openat2 |
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#endif /* SYS_openat2 */ |
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/* |
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* Arguments for how openat2(2) should open the target path. If @resolve is |
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* zero, then openat2(2) operates very similarly to openat(2). |
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* |
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* However, unlike openat(2), unknown bits in @flags result in -EINVAL rather |
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* than being silently ignored. @mode must be zero unless one of {O_CREAT, |
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* 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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__u64 flags; |
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__u64 mode; |
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__u64 resolve; |
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}; |
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#define OPEN_HOW_SIZE_VER0 24 /* sizeof first published struct */ |
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#define OPEN_HOW_SIZE_LATEST OPEN_HOW_SIZE_VER0 |
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bool needs_openat2(const struct open_how *how); |
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#ifndef RESOLVE_IN_ROOT |
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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 /* RESOLVE_IN_ROOT */ |
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#define E_func(func, ...) \ |
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do { \ |
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if (func(__VA_ARGS__) < 0) \ |
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ksft_exit_fail_msg("%s:%d %s failed\n", \ |
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__FILE__, __LINE__, #func);\ |
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} while (0) |
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#define E_asprintf(...) E_func(asprintf, __VA_ARGS__) |
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#define E_chmod(...) E_func(chmod, __VA_ARGS__) |
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#define E_dup2(...) E_func(dup2, __VA_ARGS__) |
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#define E_fchdir(...) E_func(fchdir, __VA_ARGS__) |
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#define E_fstatat(...) E_func(fstatat, __VA_ARGS__) |
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#define E_kill(...) E_func(kill, __VA_ARGS__) |
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#define E_mkdirat(...) E_func(mkdirat, __VA_ARGS__) |
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#define E_mount(...) E_func(mount, __VA_ARGS__) |
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#define E_prctl(...) E_func(prctl, __VA_ARGS__) |
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#define E_readlink(...) E_func(readlink, __VA_ARGS__) |
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#define E_setresuid(...) E_func(setresuid, __VA_ARGS__) |
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#define E_symlinkat(...) E_func(symlinkat, __VA_ARGS__) |
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#define E_touchat(...) E_func(touchat, __VA_ARGS__) |
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#define E_unshare(...) E_func(unshare, __VA_ARGS__) |
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#define E_assert(expr, msg, ...) \ |
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do { \ |
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if (!(expr)) \ |
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ksft_exit_fail_msg("ASSERT(%s:%d) failed (%s): " msg "\n", \ |
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__FILE__, __LINE__, #expr, ##__VA_ARGS__); \ |
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} while (0) |
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int raw_openat2(int dfd, const char *path, void *how, size_t size); |
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int sys_openat2(int dfd, const char *path, struct open_how *how); |
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int sys_openat(int dfd, const char *path, struct open_how *how); |
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int sys_renameat2(int olddirfd, const char *oldpath, |
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int newdirfd, const char *newpath, unsigned int flags); |
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int touchat(int dfd, const char *path); |
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char *fdreadlink(int fd); |
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bool fdequal(int fd, int dfd, const char *path); |
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extern bool openat2_supported; |
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#endif /* __RESOLVEAT_H__ */
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