1  /* Regression test for:
       2     http://code.google.com/p/address-sanitizer/issues/detail?id=37 */
       3  
       4  /* { dg-do run { target { *-*-linux* x86_64-*-freebsd* } } } */
       5  /* { dg-require-effective-target clone } */
       6  /* { dg-require-effective-target hw } */
       7  /* { dg-options "-D_GNU_SOURCE" } */
       8  
       9  #include <stdio.h>
      10  #include <stdlib.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  
      17  int 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  
      23  volatile int zero = 0;
      24  
      25  int main(int argc, char **argv) {
      26    int i;
      27    const int kStackSize = 1 << 20;
      28    char __attribute__((aligned(16))) child_stack[kStackSize + 1];
      29    char *sp = child_stack + kStackSize;  /* Stack grows down. */
      30    printf("Parent: %p\n", sp);
      31    pid_t clone_pid = clone(Child, sp, CLONE_FILES | CLONE_VM, NULL, 0, 0, 0);
      32    if (clone_pid == -1) {
      33      perror("clone");
      34      return 1;
      35    }
      36    int status;
      37    pid_t wait_result = waitpid(clone_pid, &status, __WCLONE);
      38    if (wait_result < 0) {
      39      perror("waitpid");
      40      return 1;
      41    }
      42    if (wait_result == clone_pid && WIFEXITED(status)) {
      43      /* Make sure the child stack was indeed unpoisoned. */
      44      for (i = 0; i < kStackSize; i++)
      45        child_stack[i] = i;
      46      int ret = child_stack[zero];
      47      return ret;
      48    }
      49    return 1;
      50  }