1// Regression test for:
2// http://code.google.com/p/address-sanitizer/issues/detail?id=37
3
4// RUN: %clangxx_asan -O0 %s -o %t && %run %t | FileCheck %s
5// RUN: %clangxx_asan -O1 %s -o %t && %run %t | FileCheck %s
6// RUN: %clangxx_asan -O2 %s -o %t && %run %t | FileCheck %s
7// RUN: %clangxx_asan -O3 %s -o %t && %run %t | FileCheck %s
8// XFAIL: arm-linux-gnueabi
9
10#include <stdio.h>
11#include <sched.h>
12#include <sys/syscall.h>
13#include <sys/types.h>
14#include <sys/wait.h>
15#include <unistd.h>
16
17int Child(void *arg) {
18  char x[32] = {0};  // Stack gets poisoned.
19  printf("Child:  %p\n", x);
20  _exit(1);  // NoReturn, stack will remain unpoisoned unless we do something.
21}
22
23int main(int argc, char **argv) {
24  const int kStackSize = 1 << 20;
25  char child_stack[kStackSize + 1];
26  char *sp = child_stack + kStackSize;  // Stack grows down.
27  printf("Parent: %p\n", sp);
28  pid_t clone_pid = clone(Child, sp, CLONE_FILES | CLONE_VM, NULL);
29  int status;
30  pid_t wait_result = waitpid(clone_pid, &status, __WCLONE);
31  if (wait_result < 0) {
32    perror("waitpid");
33    return 0;
34  }
35  if (wait_result == clone_pid && WIFEXITED(status)) {
36    // Make sure the child stack was indeed unpoisoned.
37    for (int i = 0; i < kStackSize; i++)
38      child_stack[i] = i;
39    int ret = child_stack[argc - 1];
40    printf("PASSED\n");
41    // CHECK: PASSED
42    return ret;
43  }
44  return 0;
45}
46