1 // SPDX-License-Identifier: GPL-2.0-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * Ported by John George
5 * Copyright (c) 2023 SUSE LLC Avinesh Kumar <[email protected]>
6 */
7
8 /*\
9 * [Description]
10 *
11 * Verify that setreuid(2) syscall fails with EPERM errno when the calling
12 * process is not privileged and a change other than
13 * (i) swapping the effective user ID with the real user ID, or
14 * (ii) setting one to the value of the other or
15 * (iii) setting the effective user ID to the value of the saved set-user-ID
16 * was specified.
17 */
18
19 #include <pwd.h>
20 #include "tst_test.h"
21 #include "tst_uid.h"
22 #include "compat_tst_16.h"
23
24 static struct passwd *ltpuser;
25 static uid_t other_uid;
26
setup(void)27 static void setup(void)
28 {
29 tst_get_uids(&other_uid, 0, 1);
30
31 UID16_CHECK(other_uid, setreuid);
32
33 ltpuser = SAFE_GETPWNAM("nobody");
34 SAFE_SETUID(ltpuser->pw_uid);
35 }
36
run(void)37 static void run(void)
38 {
39
40 TST_EXP_FAIL(SETREUID(-1, other_uid), EPERM,
41 "setreuid(%d, %d)", -1, other_uid);
42 TST_EXP_FAIL(SETREUID(other_uid, -1), EPERM,
43 "setreuid(%d, %d)", other_uid, -1);
44 TST_EXP_FAIL(SETREUID(other_uid, other_uid), EPERM,
45 "setreuid(%d, %d)", other_uid, other_uid);
46 }
47
48 static struct tst_test test = {
49 .setup = setup,
50 .test_all = run,
51 .needs_root = 1
52 };
53