1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2010-2017 Red Hat, Inc.
4 * Copyright (c) Linux Test Project, 2011-2023
5 */
6 /*\
7 * [Description]
8 *
9 * Out Of Memory (OOM) test
10 */
11
12 #include <sys/types.h>
13 #include <sys/stat.h>
14 #include <errno.h>
15 #include <fcntl.h>
16 #include <stdio.h>
17 #include <stdlib.h>
18 #include <unistd.h>
19 #include "mem.h"
20
verify_oom(void)21 static void verify_oom(void)
22 {
23 /* we expect mmap to fail before OOM is hit */
24 set_sys_tune("overcommit_memory", 2, 1);
25 oom(NORMAL, 0, ENOMEM, 0);
26
27 /* with overcommit_memory set to 0 or 1 there's no
28 * guarantee that mmap fails before OOM */
29 set_sys_tune("overcommit_memory", 0, 1);
30 oom(NORMAL, 0, ENOMEM, 1);
31
32 set_sys_tune("overcommit_memory", 1, 1);
33 testoom(0, 0, ENOMEM, 1);
34 }
35
36 static struct tst_test test = {
37 .needs_root = 1,
38 .forks_child = 1,
39 .max_runtime = TST_UNLIMITED_RUNTIME,
40 .test_all = verify_oom,
41 .skip_in_compat = 1,
42 .save_restore = (const struct tst_path_val[]) {
43 {"/proc/sys/vm/overcommit_memory", NULL, TST_SR_TBROK},
44 {}
45 },
46 };
47