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 10 static 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 31 int 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 } 43