1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
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_SOURCE |
11 | #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_openat2 |
21 | #ifndef __NR_openat2 |
22 | #define __NR_openat2 437 |
23 | #endif /* __NR_openat2 */ |
24 | #define SYS_openat2 __NR_openat2 |
25 | #endif /* SYS_openat2 */ |
26 | |
27 | /* |
28 | * Arguments for how openat2(2) should open the target path. If @resolve is |
29 | * zero, then openat2(2) operates very similarly to openat(2). |
30 | * |
31 | * However, unlike openat(2), unknown bits in @flags result in -EINVAL rather |
32 | * 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 | */ |
39 | struct 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_VER0 |
47 | |
48 | bool needs_openat2(const struct open_how *how); |
49 | |
50 | #ifndef RESOLVE_IN_ROOT |
51 | /* how->resolve flags for openat2(2). */ |
52 | #define RESOLVE_NO_XDEV 0x01 /* Block mount-point crossings |
53 | (includes bind-mounts). */ |
54 | #define RESOLVE_NO_MAGICLINKS 0x02 /* Block traversal through procfs-style |
55 | "magic-links". */ |
56 | #define RESOLVE_NO_SYMLINKS 0x04 /* Block traversal through all symlinks |
57 | (implies OEXT_NO_MAGICLINKS) */ |
58 | #define RESOLVE_BENEATH 0x08 /* Block "lexical" trickery like |
59 | "..", symlinks, and absolute |
60 | paths which escape the dirfd. */ |
61 | #define RESOLVE_IN_ROOT 0x10 /* Make all jumps to "/" and ".." |
62 | be scoped inside the dirfd |
63 | (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 | |
96 | int raw_openat2(int dfd, const char *path, void *how, size_t size); |
97 | int sys_openat2(int dfd, const char *path, struct open_how *how); |
98 | int sys_openat(int dfd, const char *path, struct open_how *how); |
99 | int sys_renameat2(int olddirfd, const char *oldpath, |
100 | int newdirfd, const char *newpath, unsigned int flags); |
101 | |
102 | int touchat(int dfd, const char *path); |
103 | char *fdreadlink(int fd); |
104 | bool fdequal(int fd, int dfd, const char *path); |
105 | |
106 | extern bool openat2_supported; |
107 | |
108 | #endif /* __RESOLVEAT_H__ */ |
109 | |