1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2023 FUJITSU LIMITED. All rights reserved.
4 * Copyright (c) Linux Test Project, 2003-2023
5 * Author: Yang Xu <[email protected]>
6 */
7
8 /*\
9 * [Description]
10 *
11 * Test basic error handling of faccessat2 syscall:
12 *
13 * - faccessat2() fails with EFAULT if pathname is a bad pathname point.
14 * - faccessat2() fails with EINVAL if flags is -1.
15 * - faccessat2() fails with EINVAL if mode is -1.
16 * - faccessat2() fails with EBADF if dirfd is -1.
17 * - faccessat2() fails with ENOTDIR if pathname is relative path to a
18 * file and dir_fd is file descriptor for this file.
19 * - faccessat2() fails with EACCES if flags is AT_EACCESS and not using
20 * the effective user and group IDs.
21 *
22 * Minimum Linux version required is v5.8.
23 */
24
25 #include <pwd.h>
26
27 #include "tst_test.h"
28 #include "lapi/syscalls.h"
29 #include "lapi/faccessat.h"
30
31 #define TESTUSER "nobody"
32 #define TESTDIR "faccessat2dir"
33 #define RELPATH "faccessat2dir/faccessat2file"
34
35 static int fd;
36 static int bad_fd = -1;
37 static int atcwd_fd = AT_FDCWD;
38 static char *bad_path;
39 static char *rel_path;
40
41 static struct passwd *ltpuser;
42
43 static struct tcase {
44 int *fd;
45 char **filename;
46 int mode;
47 int flags;
48 int exp_errno;
49 const char *desc;
50 } tcases[] = {
51 {&atcwd_fd, &bad_path, R_OK, 0, EFAULT, "invalid address"},
52 {&atcwd_fd, &rel_path, R_OK, -1, EINVAL, "invalid flags"},
53 {&atcwd_fd, &rel_path, -1, 0, EINVAL, "invalid mode"},
54 {&bad_fd, &rel_path, R_OK, 0, EBADF, "invalid fd"},
55 {&fd, &rel_path, R_OK, 0, ENOTDIR, "fd pointing to file"},
56 {&atcwd_fd, &rel_path, R_OK, AT_EACCESS, EACCES,
57 "AT_EACCESS and unprivileged EUID"},
58 };
59
verify_faccessat2(unsigned int i)60 static void verify_faccessat2(unsigned int i)
61 {
62 struct tcase *tc = &tcases[i];
63
64 if (tc->exp_errno == EACCES)
65 SAFE_SETEUID(ltpuser->pw_uid);
66
67 TST_EXP_FAIL(faccessat2(*tc->fd, *tc->filename, tc->mode, tc->flags),
68 tc->exp_errno, "faccessat2() with %s", tc->desc);
69
70 if (tc->exp_errno == EACCES)
71 SAFE_SETEUID(0);
72 }
73
setup(void)74 static void setup(void)
75 {
76 SAFE_MKDIR(TESTDIR, 0666);
77 SAFE_TOUCH(RELPATH, 0444, NULL);
78
79 fd = SAFE_OPEN(RELPATH, O_RDONLY);
80 bad_path = tst_get_bad_addr(NULL);
81
82 ltpuser = SAFE_GETPWNAM(TESTUSER);
83 }
84
cleanup(void)85 static void cleanup(void)
86 {
87 if (fd > -1)
88 SAFE_CLOSE(fd);
89 }
90
91 static struct tst_test test = {
92 .test = verify_faccessat2,
93 .tcnt = ARRAY_SIZE(tcases),
94 .setup = setup,
95 .cleanup = cleanup,
96 .bufs = (struct tst_buffers []) {
97 {&rel_path, .str = RELPATH},
98 {},
99 },
100 .needs_tmpdir = 1,
101 .needs_root = 1,
102 };
103