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/* Test that munmap() and thread creation do not race. */
#include <assert.h>
#include <pthread.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>
static const char nop_func[] = {
#if defined(__aarch64__)
0xc0, 0x03, 0x5f, 0xd6, /* ret */
#elif defined(__alpha__)
0x01, 0x80, 0xFA, 0x6B, /* ret */
#elif defined(__arm__)
0x1e, 0xff, 0x2f, 0xe1, /* bx lr */
#elif defined(__riscv)
0x67, 0x80, 0x00, 0x00, /* ret */
#elif defined(__s390__)
0x07, 0xfe, /* br %r14 */
#elif defined(__i386__) || defined(__x86_64__)
0xc3, /* ret */
#endif
};
static void *thread_mmap_munmap(void *arg)
{
volatile bool *run = arg;
char *p;
int ret;
while (*run) {
p = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
assert(p != MAP_FAILED);
/* Create a small translation block. */
memcpy(p, nop_func, sizeof(nop_func));
((void(*)(void))p)();
ret = munmap(p, getpagesize());
assert(ret == 0);
}
return NULL;
}
static void *thread_dummy(void *arg)
{
return NULL;
}
int main(void)
{
pthread_t mmap_munmap, dummy;
volatile bool run = true;
int i, ret;
/* Without a template, nothing to test. */
if (sizeof(nop_func) == 0) {
return EXIT_SUCCESS;
}
ret = pthread_create(&mmap_munmap, NULL, thread_mmap_munmap, (void *)&run);
assert(ret == 0);
for (i = 0; i < 1000; i++) {
ret = pthread_create(&dummy, NULL, thread_dummy, NULL);
assert(ret == 0);
ret = pthread_join(dummy, NULL);
assert(ret == 0);
}
run = false;
ret = pthread_join(mmap_munmap, NULL);
assert(ret == 0);
return EXIT_SUCCESS;
}
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