test/asan/TestCases/free_hook_realloc.cc

   1 // Check that free hook doesn't conflict with Realloc.
   2 // RUN: %clangxx_asan -O2 %s -o %t
   3 // RUN: %t 2>&1 | FileCheck %s
   4 #include <stdlib.h>
   5 #include <unistd.h>
   6
   7 static void *glob_ptr;
   8
   9 extern "C" {
  10 void __asan_free_hook(void *ptr) {
  11   if (ptr == glob_ptr) {
  12     *(int*)ptr = 0;
  13     write(1, "FreeHook\n", sizeof("FreeHook\n"));
  14   }
  15 }
  16 }
  17
  18 int main() {
  19   int *x = (int*)malloc(100);
  20   x[0] = 42;
  21   glob_ptr = x;
  22   int *y = (int*)realloc(x, 200);
  23   // Verify that free hook was called and didn't spoil the memory.
  24   if (y[0] != 42) {
  25     _exit(1);
  26   }
  27   write(1, "Passed\n", sizeof("Passed\n"));
  28   free(y);
  29   // CHECK: FreeHook
  30   // CHECK: Passed
  31   return 0;
  32 }