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
32static char *longname_dir;
33static char *file_name;
34static char *nonexistent_dir;
35static char *bad_ptr;
36static char *loop_dir;
37
38static 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
50static 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
57static 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
69static 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