1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2021, BELLSOFT. All rights reserved.
4 * Copyright (c) International Business Machines Corp., 2001
5 */
6
7 /*\
8 * [Description]
9 *
10 * Testcase to test whether sched_setscheduler(2) sets the errnos
11 * correctly.
12 *
13 * [Algorithm]
14 *
15 * Call sched_setscheduler as a non-root uid, and expect EPERM
16 * to be returned.
17 *
18 */
19
20 #include <stdlib.h>
21 #include <errno.h>
22 #include <pwd.h>
23 #include <sys/types.h>
24
25 #include "tst_test.h"
26 #include "tst_sched.h"
27
28 static uid_t nobody_uid;
29
setup(void)30 static void setup(void)
31 {
32 struct passwd *pw = SAFE_GETPWNAM("nobody");
33
34 tst_res(TINFO, "Testing %s variant", sched_variants[tst_variant].desc);
35
36 nobody_uid = pw->pw_uid;
37 }
38
run(void)39 static void run(void)
40 {
41 struct sched_variant *tv = &sched_variants[tst_variant];
42 pid_t pid = SAFE_FORK();
43
44 if (!pid) {
45 struct sched_param p = { .sched_priority = 1 };
46
47 SAFE_SETEUID(nobody_uid);
48 TST_EXP_FAIL(tv->sched_setscheduler(0, SCHED_FIFO, &p), EPERM,
49 "sched_setscheduler(0, SCHED_FIFO, %d)",
50 p.sched_priority);
51 exit(0);
52 }
53 tst_reap_children();
54 }
55
56 static struct tst_test test = {
57 .forks_child = 1,
58 .needs_root = 1,
59 .setup = setup,
60 .test_variants = ARRAY_SIZE(sched_variants),
61 .test_all = run,
62 };
63