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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Author: Aleksa Sarai <cyphar@cyphar.com>4 * Copyright (C) 2018-2019 SUSE LLC.5 */6 7#ifndef __RESOLVEAT_H__8#define __RESOLVEAT_H__9 10#define _GNU_SOURCE11#include <stdint.h>12#include <stdbool.h>13#include <errno.h>14#include <linux/types.h>15#include "../kselftest.h"16 17#define ARRAY_LEN(X) (sizeof (X) / sizeof (*(X)))18#define BUILD_BUG_ON(e) ((void)(sizeof(struct { int:(-!!(e)); })))19 20#ifndef SYS_openat221#ifndef __NR_openat222#define __NR_openat2 43723#endif /* __NR_openat2 */24#define SYS_openat2 __NR_openat225#endif /* SYS_openat2 */26 27/*28 * Arguments for how openat2(2) should open the target path. If @resolve is29 * zero, then openat2(2) operates very similarly to openat(2).30 *31 * However, unlike openat(2), unknown bits in @flags result in -EINVAL rather32 * than being silently ignored. @mode must be zero unless one of {O_CREAT,33 * O_TMPFILE} are set.34 *35 * @flags: O_* flags.36 * @mode: O_CREAT/O_TMPFILE file mode.37 * @resolve: RESOLVE_* flags.38 */39struct open_how {40 __u64 flags;41 __u64 mode;42 __u64 resolve;43};44 45#define OPEN_HOW_SIZE_VER0 24 /* sizeof first published struct */46#define OPEN_HOW_SIZE_LATEST OPEN_HOW_SIZE_VER047 48bool needs_openat2(const struct open_how *how);49 50#ifndef RESOLVE_IN_ROOT51/* how->resolve flags for openat2(2). */52#define RESOLVE_NO_XDEV 0x01 /* Block mount-point crossings53 (includes bind-mounts). */54#define RESOLVE_NO_MAGICLINKS 0x02 /* Block traversal through procfs-style55 "magic-links". */56#define RESOLVE_NO_SYMLINKS 0x04 /* Block traversal through all symlinks57 (implies OEXT_NO_MAGICLINKS) */58#define RESOLVE_BENEATH 0x08 /* Block "lexical" trickery like59 "..", symlinks, and absolute60 paths which escape the dirfd. */61#define RESOLVE_IN_ROOT 0x10 /* Make all jumps to "/" and ".."62 be scoped inside the dirfd63 (similar to chroot(2)). */64#endif /* RESOLVE_IN_ROOT */65 66#define E_func(func, ...) \67 do { \68 errno = 0; \69 if (func(__VA_ARGS__) < 0) \70 ksft_exit_fail_msg("%s:%d %s failed - errno:%d\n", \71 __FILE__, __LINE__, #func, errno); \72 } while (0)73 74#define E_asprintf(...) E_func(asprintf, __VA_ARGS__)75#define E_chmod(...) E_func(chmod, __VA_ARGS__)76#define E_dup2(...) E_func(dup2, __VA_ARGS__)77#define E_fchdir(...) E_func(fchdir, __VA_ARGS__)78#define E_fstatat(...) E_func(fstatat, __VA_ARGS__)79#define E_kill(...) E_func(kill, __VA_ARGS__)80#define E_mkdirat(...) E_func(mkdirat, __VA_ARGS__)81#define E_mount(...) E_func(mount, __VA_ARGS__)82#define E_prctl(...) E_func(prctl, __VA_ARGS__)83#define E_readlink(...) E_func(readlink, __VA_ARGS__)84#define E_setresuid(...) E_func(setresuid, __VA_ARGS__)85#define E_symlinkat(...) E_func(symlinkat, __VA_ARGS__)86#define E_touchat(...) E_func(touchat, __VA_ARGS__)87#define E_unshare(...) E_func(unshare, __VA_ARGS__)88 89#define E_assert(expr, msg, ...) \90 do { \91 if (!(expr)) \92 ksft_exit_fail_msg("ASSERT(%s:%d) failed (%s): " msg "\n", \93 __FILE__, __LINE__, #expr, ##__VA_ARGS__); \94 } while (0)95 96int raw_openat2(int dfd, const char *path, void *how, size_t size);97int sys_openat2(int dfd, const char *path, struct open_how *how);98int sys_openat(int dfd, const char *path, struct open_how *how);99int sys_renameat2(int olddirfd, const char *oldpath,100 int newdirfd, const char *newpath, unsigned int flags);101 102int touchat(int dfd, const char *path);103char *fdreadlink(int fd);104bool fdequal(int fd, int dfd, const char *path);105 106extern bool openat2_supported;107 108#endif /* __RESOLVEAT_H__ */109