1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) International Business Machines Corp., 2001
4 * Ported by Wayne Boyer
5 * Adapted by Dustin Kirkland <k1rkland@us.ibm.com>
6 * Adapted by Zhao gongyi <zhaogongyi@huawei.com>
7 */
8
9 /*\
10 * [Description]
11 *
12 * Testcase for setfsgid() syscall to check that
13 *
14 * - privileged user can change a filesystem group ID different from saved
15 * value of previous setfsgid() call
16 * - unprivileged user cannot change it
17 */
18
19 #include <pwd.h>
20 #include "tst_test.h"
21 #include "compat_tst_16.h"
22
23 static gid_t gid;
24 static gid_t pre_gid;
25 static const char nobody_uid[] = "nobody";
26 static struct passwd *ltpuser;
27
run(unsigned int i)28 static void run(unsigned int i)
29 {
30 int cnt;
31
32 GID16_CHECK(gid, setfsgid);
33
34 if (i == 0) {
35 ltpuser = SAFE_GETPWNAM(nobody_uid);
36 SAFE_SETEUID(ltpuser->pw_uid);
37 }
38
39 /*
40 * Run SETFSGID() twice to check the second running have changed
41 * the gid for privileged user, and have not changed the gid
42 * for unprivileged user.
43 */
44 for (cnt = 0; cnt < 2; cnt++) {
45 TEST(SETFSGID(gid));
46 if ((long)pre_gid != TST_RET) {
47 tst_res(TFAIL, "EUID %d: setfsgid() returned %ld", geteuid(), TST_RET);
48 } else {
49 tst_res(TPASS, "EUID %d: setfsgid() returned expected value: %ld",
50 geteuid(), TST_RET);
51 if (i == 1) {
52 pre_gid = gid;
53 gid++;
54 }
55 }
56 }
57
58 if (i == 0)
59 SAFE_SETEUID(0);
60 }
61
setup(void)62 static void setup(void)
63 {
64 pre_gid = 0;
65 gid = 1;
66 }
67
68 static struct tst_test test = {
69 .needs_root = 1,
70 .setup = setup,
71 .test = run,
72 .tcnt = 2,
73 };
74