1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2014 Fujitsu Ltd.
4 * Author: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
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 #include "lapi/mkdirat.h"
15
16 #define MNT_POINT "mntpoint"
17 #define TEST_DIR "mntpoint/test_dir"
18 #define DIR_MODE (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP| \
19 S_IXGRP|S_IROTH|S_IXOTH)
20
21 static int dir_fd;
22 static int cur_fd = AT_FDCWD;
23 static char test_dir[PATH_MAX] = ".";
24
25 static struct tcase {
26 int *dirfd;
27 char *pathname;
28 int exp_errno;
29 } tcases[] = {
30 {&dir_fd, TEST_DIR, EROFS},
31 {&cur_fd, TEST_DIR, EROFS},
32 {&dir_fd, test_dir, ELOOP},
33 {&cur_fd, test_dir, ELOOP},
34 };
35
setup(void)36 static void setup(void)
37 {
38 unsigned int i;
39
40 dir_fd = SAFE_OPEN(".", O_DIRECTORY);
41
42 SAFE_MKDIR("test_eloop", DIR_MODE);
43 SAFE_SYMLINK("../test_eloop", "test_eloop/test_eloop");
44
45 /*
46 * NOTE: the ELOOP test is written based on that the consecutive
47 * symlinks limits in kernel is hardwired to 40.
48 */
49 for (i = 0; i < 43; i++)
50 strcat(test_dir, "/test_eloop");
51 }
52
mkdirat_verify(unsigned int i)53 static void mkdirat_verify(unsigned int i)
54 {
55 struct tcase *test = &tcases[i];
56
57 TEST(mkdirat(*test->dirfd, test->pathname, 0777));
58
59 if (TST_RET != -1) {
60 tst_res(TFAIL, "mkdirat() succeeded unexpectedly (%li)",
61 TST_RET);
62 return;
63 }
64
65 if (TST_ERR == test->exp_errno) {
66 tst_res(TPASS | TTERRNO, "mkdirat() failed as expected");
67 return;
68 }
69
70 tst_res(TFAIL | TTERRNO,
71 "mkdirat() failed unexpectedly; expected: %d - %s",
72 test->exp_errno, tst_strerrno(test->exp_errno));
73 }
74
75 static struct tst_test test = {
76 .setup = setup,
77 .test = mkdirat_verify,
78 .tcnt = ARRAY_SIZE(tcases),
79 .needs_root = 1,
80 .needs_rofs = 1,
81 .mntpoint = MNT_POINT,
82 };
83