1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 *
5 * Ported by John George
6 */
7
8 /*
9 * Test setregid() when executed by root.
10 */
11
12 #include "tst_test.h"
13 #include "tst_uid.h"
14 #include "compat_tst_16.h"
15
16 static gid_t first_gid, second_gid, root_gid, neg_one = -1;
17
18 /*
19 * The following structure contains all test data. Each structure in the array
20 * is used for a separate test. The tests are executed in the for loop below.
21 */
22
23 struct test_data_t {
24 gid_t *real_gid;
25 gid_t *eff_gid;
26 gid_t *exp_real_usr;
27 gid_t *exp_eff_usr;
28 const char *test_msg;
29 } test_data[] = {
30 {
31 &root_gid, &root_gid, &root_gid, &root_gid,
32 "After setregid(root, root),"}, {
33 &first_gid, &neg_one, &first_gid, &root_gid,
34 "After setregid(first, -1)"}, {
35 &root_gid, &neg_one, &root_gid, &root_gid,
36 "After setregid(root,-1),"}, {
37 &neg_one, &neg_one, &root_gid, &root_gid,
38 "After setregid(-1, -1),"}, {
39 &neg_one, &root_gid, &root_gid, &root_gid,
40 "After setregid(-1, root)"}, {
41 &root_gid, &neg_one, &root_gid, &root_gid,
42 "After setregid(root, -1),"}, {
43 &second_gid, &first_gid, &second_gid, &first_gid,
44 "After setregid(second, first)"}, {
45 &neg_one, &neg_one, &second_gid, &first_gid,
46 "After setregid(-1, -1)"}, {
47 &neg_one, &first_gid, &second_gid, &first_gid,
48 "After setregid(-1, first)"}
49 };
50
gid_verify(gid_t rg,gid_t eg,const char * when)51 static void gid_verify(gid_t rg, gid_t eg, const char *when)
52 {
53 if ((getgid() != rg) || (getegid() != eg)) {
54 tst_res(TFAIL, "ERROR: %s real gid = %d; effective gid = %d",
55 when, getgid(), getegid());
56 tst_res(TINFO, "Expected: real gid = %d; effective gid = %d",
57 rg, eg);
58 } else {
59 tst_res(TPASS,
60 "real or effective gid was modified as expected");
61 }
62 }
63
run(unsigned int i)64 static void run(unsigned int i)
65 {
66 /* Set the real or effective group id */
67 TEST(SETREGID(*test_data[i].real_gid, *test_data[i].eff_gid));
68
69 if (TST_RET == -1) {
70 tst_res(TFAIL | TTERRNO, "setregid(%d, %d) failed",
71 *test_data[i].real_gid, *test_data[i].eff_gid);
72 return;
73 }
74
75 gid_verify(*test_data[i].exp_real_usr, *test_data[i].exp_eff_usr,
76 test_data[i].test_msg);
77 }
78
setup(void)79 static void setup(void)
80 {
81 gid_t test_groups[3];
82
83 root_gid = test_groups[0] = getgid();
84 tst_get_gids(test_groups, 1, 3);
85 first_gid = test_groups[1];
86 second_gid = test_groups[2];
87 }
88
89 static struct tst_test test = {
90 .tcnt = ARRAY_SIZE(test_data),
91 .needs_root = 1,
92 .test = run,
93 .setup = setup,
94 };
95