1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * 07/2001 Ported by Wayne Boyer
5 * Copyright (c) 2021 Xie Ziyao <[email protected]>
6 */
7
8 /*\
9 * [Description]
10 *
11 * Verify that chown(2) invoked by super-user:
12 *
13 * - clears setuid and setgid bits set on an executable file
14 * - preserves setgid bit set on a non-group-executable file
15 */
16
17 #include "tst_test.h"
18 #include "compat_tst_16.h"
19 #include "tst_safe_macros.h"
20
21 #define NEW_PERMS1 (S_IFREG|S_IRWXU|S_IRWXG|S_ISUID|S_ISGID)
22 #define NEW_PERMS2 (S_IFREG|S_IRWXU|S_ISGID)
23 #define EXP_PERMS (S_IFREG|S_IRWXU|S_IRWXG)
24 #define TESTFILE1 "testfile1"
25 #define TESTFILE2 "testfile2"
26
27 struct test_case_t {
28 const char *filename;
29 mode_t set_mode;
30 mode_t exp_mode;
31 } tc[] = {
32 {TESTFILE1, NEW_PERMS1, EXP_PERMS},
33 {TESTFILE2, NEW_PERMS2, NEW_PERMS2}
34 };
35
run(unsigned int i)36 static void run(unsigned int i)
37 {
38 uid_t uid;
39 gid_t gid;
40
41 UID16_CHECK((uid = geteuid()), "chown");
42 GID16_CHECK((gid = getegid()), "chown");
43
44 SAFE_CHMOD(tc[i].filename, tc[i].set_mode);
45
46 TST_EXP_PASS(CHOWN(tc[i].filename, uid, gid), "chown(%s, %d, %d)",
47 tc[i].filename, uid, gid);
48
49 struct stat stat_buf;
50 SAFE_STAT(tc[i].filename, &stat_buf);
51
52 if (stat_buf.st_uid != uid || stat_buf.st_gid != gid) {
53 tst_res(TFAIL, "%s: owner set to (uid=%d, gid=%d), expected (uid=%d, gid=%d)",
54 tc[i].filename, stat_buf.st_uid, stat_buf.st_gid, uid, gid);
55 }
56
57 if (stat_buf.st_mode != tc[i].exp_mode) {
58 tst_res(TFAIL, "%s: wrong mode permissions %#o, expected %#o",
59 tc[i].filename, stat_buf.st_mode, tc[i].exp_mode);
60 }
61 }
62
setup(void)63 static void setup(void)
64 {
65 unsigned int i;
66
67 for (i = 0; i < ARRAY_SIZE(tc); i++)
68 SAFE_TOUCH(tc[i].filename, tc[i].set_mode, NULL);
69 }
70
71 static struct tst_test test = {
72 .tcnt = ARRAY_SIZE(tc),
73 .needs_root = 1,
74 .needs_tmpdir = 1,
75 .setup = setup,
76 .test = run,
77 };
78