1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 *
5 * 07/2001 Ported by Wayne Boyer
6 */
7
8 /*\
9 * [Description]
10 *
11 * Testcase to test whether chroot(2) sets errno correctly.
12 *
13 * - to test whether chroot() is setting ENAMETOOLONG if the
14 * pathname is more than VFS_MAXNAMELEN.
15 * - to test whether chroot() is setting ENOTDIR if the argument
16 * is not a directory.
17 * - to test whether chroot() is setting ENOENT if the directory
18 * does not exist.
19 * - attempt to chroot to a path pointing to an invalid address
20 * and expect EFAULT as errno.
21 * - to test whether chroot() is setting ELOOP if the two
22 * symbolic directory who point to each other.
23 */
24
25 #include <stdio.h>
26 #include "tst_test.h"
27
28 #define FILE_NAME "test_file"
29 #define LOOP_DIR "sym_dir1"
30 #define NONEXISTENT_DIR "does_not_exist"
31
32 static char *longname_dir;
33 static char *file_name;
34 static char *nonexistent_dir;
35 static char *bad_ptr;
36 static char *loop_dir;
37
38 static struct tcase {
39 char **dir;
40 int error;
41 char *desc;
42 } tcases[] = {
43 {&longname_dir, ENAMETOOLONG, "chroot(longer than VFS_MAXNAMELEN)"},
44 {&file_name, ENOTDIR, "chroot(not a directory)"},
45 {&nonexistent_dir, ENOENT, "chroot(does not exists)"},
46 {&bad_ptr, EFAULT, "chroot(an invalid address)"},
47 {&loop_dir, ELOOP, "chroot(symlink loop)"}
48 };
49
verify_chroot(unsigned int n)50 static void verify_chroot(unsigned int n)
51 {
52 struct tcase *tc = &tcases[n];
53
54 TST_EXP_FAIL(chroot(*tc->dir), tc->error, "%s", tc->desc);
55 }
56
setup(void)57 static void setup(void)
58 {
59 SAFE_TOUCH(FILE_NAME, 0666, NULL);
60 bad_ptr = tst_get_bad_addr(NULL);
61
62 memset(longname_dir, 'a', PATH_MAX + 1);
63 longname_dir[PATH_MAX+1] = 0;
64
65 SAFE_SYMLINK("sym_dir1/", "sym_dir2");
66 SAFE_SYMLINK("sym_dir2/", "sym_dir1");
67 }
68
69 static struct tst_test test = {
70 .setup = setup,
71 .tcnt = ARRAY_SIZE(tcases),
72 .test = verify_chroot,
73 .needs_tmpdir = 1,
74 .bufs = (struct tst_buffers []) {
75 {&file_name, .str = FILE_NAME},
76 {&nonexistent_dir, .str = NONEXISTENT_DIR},
77 {&loop_dir, .str = LOOP_DIR},
78 {&longname_dir, .size = PATH_MAX+2},
79 {}
80 }
81 };
82