43 lines · c
1// SPDX-License-Identifier: GPL-2.02#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 else39 test_limit();40 41 ksft_finished();42}43