| 1 | /* Test that munmap() and thread creation do not race. */ |
| 2 | #include <assert.h> |
| 3 | #include <pthread.h> |
| 4 | #include <stdbool.h> |
| 5 | #include <stdlib.h> |
| 6 | #include <string.h> |
| 7 | #include <sys/mman.h> |
| 8 | #include <unistd.h> |
| 9 | |
| 10 | #include "nop_func.h" |
| 11 | |
| 12 | static void *thread_mmap_munmap(void *arg) |
| 13 | { |
| 14 | volatile bool *run = arg; |
| 15 | char *p; |
| 16 | int ret; |
| 17 | |
| 18 | while (*run) { |
| 19 | p = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE | PROT_EXEC, |
| 20 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
| 21 | assert(p != MAP_FAILED); |
| 22 | |
| 23 | /* Create a small translation block. */ |
| 24 | memcpy(p, nop_func, sizeof(nop_func)); |
| 25 | ((void(*)(void))p)(); |
| 26 | |
| 27 | ret = munmap(p, getpagesize()); |
| 28 | assert(ret == 0); |
| 29 | } |
| 30 | |
| 31 | return NULL; |
| 32 | } |
| 33 | |
| 34 | static void *thread_dummy(void *arg) |
| 35 | { |
| 36 | return NULL; |
| 37 | } |
| 38 | |
| 39 | int main(void) |
| 40 | { |
| 41 | pthread_t mmap_munmap, dummy; |
| 42 | volatile bool run = true; |
| 43 | int i, ret; |
| 44 | |
| 45 | /* Without a template, nothing to test. */ |
| 46 | if (sizeof(nop_func) == 0) { |
| 47 | return EXIT_SUCCESS; |
| 48 | } |
| 49 | |
| 50 | ret = pthread_create(&mmap_munmap, NULL, thread_mmap_munmap, (void *)&run); |
| 51 | assert(ret == 0); |
| 52 | |
| 53 | for (i = 0; i < 1000; i++) { |
| 54 | ret = pthread_create(&dummy, NULL, thread_dummy, NULL); |
| 55 | assert(ret == 0); |
| 56 | ret = pthread_join(dummy, NULL); |
| 57 | assert(ret == 0); |
| 58 | } |
| 59 | |
| 60 | run = false; |
| 61 | ret = pthread_join(mmap_munmap, NULL); |
| 62 | assert(ret == 0); |
| 63 | |
| 64 | return EXIT_SUCCESS; |
| 65 | } |