1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2014 Fujitsu Ltd.
4 * Author: Zeng Linggang <[email protected]>
5 */
6 /*
7 * DESCRIPTION
8 * check mkdirat() with various error conditions that should produce
9 * ELOOP and EROFS.
10 */
11
12 #define _GNU_SOURCE
13 #include "tst_test.h"
14
15 #define MNT_POINT "mntpoint"
16 #define TEST_DIR "mntpoint/test_dir"
17 #define DIR_MODE (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP| \
18 S_IXGRP|S_IROTH|S_IXOTH)
19
20 static int dir_fd;
21 static int cur_fd = AT_FDCWD;
22 static char test_dir[PATH_MAX] = ".";
23
24 static struct tcase {
25 int *dirfd;
26 char *pathname;
27 int exp_errno;
28 } tcases[] = {
29 {&dir_fd, TEST_DIR, EROFS},
30 {&cur_fd, TEST_DIR, EROFS},
31 {&dir_fd, test_dir, ELOOP},
32 {&cur_fd, test_dir, ELOOP},
33 };
34
setup(void)35 static void setup(void)
36 {
37 unsigned int i;
38
39 dir_fd = SAFE_OPEN(".", O_DIRECTORY);
40
41 SAFE_MKDIR("test_eloop", DIR_MODE);
42 SAFE_SYMLINK("../test_eloop", "test_eloop/test_eloop");
43
44 /*
45 * NOTE: the ELOOP test is written based on that the consecutive
46 * symlinks limits in kernel is hardwired to 40.
47 */
48 for (i = 0; i < 43; i++)
49 strcat(test_dir, "/test_eloop");
50 }
51
mkdirat_verify(unsigned int i)52 static void mkdirat_verify(unsigned int i)
53 {
54 struct tcase *test = &tcases[i];
55
56 TEST(mkdirat(*test->dirfd, test->pathname, 0777));
57
58 if (TST_RET != -1) {
59 tst_res(TFAIL, "mkdirat() succeeded unexpectedly (%li)",
60 TST_RET);
61 return;
62 }
63
64 if (TST_ERR == test->exp_errno) {
65 tst_res(TPASS | TTERRNO, "mkdirat() failed as expected");
66 return;
67 }
68
69 tst_res(TFAIL | TTERRNO,
70 "mkdirat() failed unexpectedly; expected: %d - %s",
71 test->exp_errno, tst_strerrno(test->exp_errno));
72 }
73
74 static struct tst_test test = {
75 .setup = setup,
76 .test = mkdirat_verify,
77 .tcnt = ARRAY_SIZE(tcases),
78 .needs_root = 1,
79 .needs_rofs = 1,
80 .mntpoint = MNT_POINT,
81 };
82