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
28static uid_t nobody_uid;
29
30static 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
39static 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
56static 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