lib/asan/lit_tests/TestCases/Linux/clone_test.cc

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