1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <sys/mman.h>
3*4882a593Smuzhiyun #include <stdio.h>
4*4882a593Smuzhiyun #include <unistd.h>
5*4882a593Smuzhiyun #include <string.h>
6*4882a593Smuzhiyun #include <sys/time.h>
7*4882a593Smuzhiyun #include <sys/resource.h>
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #ifndef MCL_ONFAULT
10*4882a593Smuzhiyun #define MCL_ONFAULT (MCL_FUTURE << 1)
11*4882a593Smuzhiyun #endif
12*4882a593Smuzhiyun
test_limit(void)13*4882a593Smuzhiyun static int test_limit(void)
14*4882a593Smuzhiyun {
15*4882a593Smuzhiyun int ret = 1;
16*4882a593Smuzhiyun struct rlimit lims;
17*4882a593Smuzhiyun void *map;
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun if (getrlimit(RLIMIT_MEMLOCK, &lims)) {
20*4882a593Smuzhiyun perror("getrlimit");
21*4882a593Smuzhiyun return ret;
22*4882a593Smuzhiyun }
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun if (mlockall(MCL_ONFAULT | MCL_FUTURE)) {
25*4882a593Smuzhiyun perror("mlockall");
26*4882a593Smuzhiyun return ret;
27*4882a593Smuzhiyun }
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun map = mmap(NULL, 2 * lims.rlim_max, PROT_READ | PROT_WRITE,
30*4882a593Smuzhiyun MAP_PRIVATE | MAP_ANONYMOUS | MAP_POPULATE, -1, 0);
31*4882a593Smuzhiyun if (map != MAP_FAILED)
32*4882a593Smuzhiyun printf("mmap should have failed, but didn't\n");
33*4882a593Smuzhiyun else {
34*4882a593Smuzhiyun ret = 0;
35*4882a593Smuzhiyun munmap(map, 2 * lims.rlim_max);
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun munlockall();
39*4882a593Smuzhiyun return ret;
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
main(int argc,char ** argv)42*4882a593Smuzhiyun int main(int argc, char **argv)
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun int ret = 0;
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun ret += test_limit();
47*4882a593Smuzhiyun return ret;
48*4882a593Smuzhiyun }
49