tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2#include <sys/mman.h>
3#include <stdio.h>
4#include <unistd.h>
5#include <string.h>
6#include <sys/time.h>
7#include <sys/resource.h>
8#include "../kselftest.h"
9
10static void test_limit(void)
11{
12 struct rlimit lims;
13 void *map;
14
15 if (getrlimit(RLIMIT_MEMLOCK, &lims))
16 ksft_exit_fail_msg("getrlimit: %s\n", strerror(errno));
17
18 if (mlockall(MCL_ONFAULT | MCL_FUTURE))
19 ksft_exit_fail_msg("mlockall: %s\n", strerror(errno));
20
21 map = mmap(NULL, 2 * lims.rlim_max, PROT_READ | PROT_WRITE,
22 MAP_PRIVATE | MAP_ANONYMOUS | MAP_POPULATE, -1, 0);
23
24 ksft_test_result(map == MAP_FAILED, "The map failed respecting mlock limits\n");
25
26 if (map != MAP_FAILED)
27 munmap(map, 2 * lims.rlim_max);
28 munlockall();
29}
30
31int main(int argc, char **argv)
32{
33 ksft_print_header();
34 ksft_set_plan(1);
35
36 if (!getuid())
37 ksft_test_result_skip("The test must be run from a normal user\n");
38 else
39 test_limit();
40
41 ksft_finished();
42}