1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * 07/2001 ported by John George
5 * Copyright (C) 2021 SUSE LLC <mdoucha@suse.cz>
6 */
7
8 /*\
9 * [Description]
10 *
11 * Test that the setresuid system call sets the proper errno values when
12 * a non-root user attempts to change the real, effective or saved uid
13 * to a value other than one of the current uid, the current effective uid
14 * or the current saved uid.
15 */
16
17 #include "tst_test.h"
18 #include "tst_uid.h"
19 #include "compat_tst_16.h"
20
21 static uid_t root_uid, main_uid, other_uid, neg_one = -1;
22
23 static struct test_data_t {
24 uid_t *real_uid;
25 uid_t *eff_uid;
26 uid_t *sav_uid;
27 int exp_errno;
28 uid_t *exp_real_uid;
29 uid_t *exp_eff_uid;
30 uid_t *exp_sav_uid;
31 char *test_msg;
32 } test_data[] = {
33 {&other_uid, &neg_one, &neg_one, EPERM, &root_uid, &main_uid,
34 &main_uid, "setresuid(other, -1, -1)"},
35 {&neg_one, &neg_one, &other_uid, EPERM, &root_uid, &main_uid,
36 &main_uid, "setresuid(-1, -1, other)"},
37 {&neg_one, &other_uid, &neg_one, EPERM, &root_uid, &main_uid,
38 &main_uid, "setresuid(-1, other, -1)"}
39 };
40
setup(void)41 static void setup(void)
42 {
43 uid_t test_users[2];
44
45 root_uid = getuid();
46 tst_get_uids(test_users, 0, 2);
47 main_uid = test_users[0];
48 other_uid = test_users[1];
49
50 UID16_CHECK(root_uid, setresuid);
51 UID16_CHECK(main_uid, setresuid);
52 UID16_CHECK(other_uid, setresuid);
53
54 SAFE_SETRESUID(root_uid, main_uid, main_uid);
55 }
56
run(unsigned int n)57 static void run(unsigned int n)
58 {
59 const struct test_data_t *tc = test_data + n;
60
61 TST_EXP_FAIL(SETRESUID(*tc->real_uid, *tc->eff_uid, *tc->sav_uid),
62 tc->exp_errno, "%s", tc->test_msg);
63
64 if (!TST_PASS)
65 return;
66
67 tst_check_resuid(tc->test_msg, *tc->exp_real_uid, *tc->exp_eff_uid,
68 *tc->exp_sav_uid);
69 }
70
71 static struct tst_test test = {
72 .test = run,
73 .tcnt = ARRAY_SIZE(test_data),
74 .setup = setup,
75 .needs_root = 1,
76 };
77