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
16static 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
23struct 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
51static 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
64static 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
79static 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
89static struct tst_test test = {
90	.tcnt = ARRAY_SIZE(test_data),
91	.needs_root = 1,
92	.test = run,
93	.setup = setup,
94};
95