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 "compat_tst_16.h"
14
15 static gid_t neg_one = -1;
16
17 static struct group nobody_gr, daemon_gr, root_gr, bin_gr;
18
19 /*
20 * The following structure contains all test data. Each structure in the array
21 * is used for a separate test. The tests are executed in the for loop below.
22 */
23
24 struct test_data_t {
25 gid_t *real_gid;
26 gid_t *eff_gid;
27 struct group *exp_real_usr;
28 struct group *exp_eff_usr;
29 const char *test_msg;
30 } test_data[] = {
31 {
32 &root_gr.gr_gid, &root_gr.gr_gid, &root_gr, &root_gr,
33 "After setregid(root, root),"}, {
34 &nobody_gr.gr_gid, &neg_one, &nobody_gr, &root_gr,
35 "After setregid(nobody, -1)"}, {
36 &root_gr.gr_gid, &neg_one, &root_gr, &root_gr,
37 "After setregid(root,-1),"}, {
38 &neg_one, &neg_one, &root_gr, &root_gr,
39 "After setregid(-1, -1),"}, {
40 &neg_one, &root_gr.gr_gid, &root_gr, &root_gr,
41 "After setregid(-1, root)"}, {
42 &root_gr.gr_gid, &neg_one, &root_gr, &root_gr,
43 "After setregid(root, -1),"}, {
44 &daemon_gr.gr_gid, &nobody_gr.gr_gid, &daemon_gr, &nobody_gr,
45 "After setregid(daemon, nobody)"}, {
46 &neg_one, &neg_one, &daemon_gr, &nobody_gr,
47 "After setregid(-1, -1)"}, {
48 &neg_one, &nobody_gr.gr_gid, &daemon_gr, &nobody_gr,
49 "After setregid(-1, nobody)"}
50 };
51
gid_verify(struct group * rg,struct group * eg,const char * when)52 static void gid_verify(struct group *rg, struct group *eg, const char *when)
53 {
54 if ((getgid() != rg->gr_gid) || (getegid() != eg->gr_gid)) {
55 tst_res(TFAIL, "ERROR: %s real gid = %d; effective gid = %d",
56 when, getgid(), getegid());
57 tst_res(TINFO, "Expected: real gid = %d; effective gid = %d",
58 rg->gr_gid, eg->gr_gid);
59 } else {
60 tst_res(TPASS,
61 "real or effective gid was modified as expected");
62 }
63 }
64
65
run(unsigned int i)66 static void run(unsigned int i)
67 {
68 /* Set the real or effective group id */
69 TEST(SETREGID(*test_data[i].real_gid, *test_data[i].eff_gid));
70
71 if (TST_RET == -1) {
72 tst_res(TFAIL | TTERRNO, "setregid(%d, %d) failed",
73 *test_data[i].real_gid, *test_data[i].eff_gid);
74 return;
75 }
76
77 gid_verify(test_data[i].exp_real_usr, test_data[i].exp_eff_usr,
78 test_data[i].test_msg);
79 }
80
setup(void)81 static void setup(void)
82 {
83 root_gr = *SAFE_GETGRNAM("root");
84 nobody_gr = *SAFE_GETGRNAM_FALLBACK("nobody", "nogroup");
85 daemon_gr = *SAFE_GETGRNAM("daemon");
86 bin_gr = *SAFE_GETGRNAM("bin");
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