compiler-rt/test/hwasan/TestCases/double-free.c

   1 // RUN: %clang_hwasan %s -o %t && not %run %t 2>&1 | FileCheck %s
   2
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5 #include <sanitizer/hwasan_interface.h>
   6
   7 int main() {
   8   __hwasan_enable_allocator_tagging();
   9   char * volatile x = (char*)malloc(40);
  10   free(x);
  11   free(x);
  12   // CHECK: ERROR: HWAddressSanitizer: invalid-free on address {{.*}} at pc {{[0x]+}}[[PC:.*]] on thread T{{[0-9]+}}
  13   // CHECK: tags: [[PTR_TAG:..]]/[[MEM_TAG:..]] (ptr/mem)
  14   // CHECK: #0 {{[0x]+}}{{.*}}[[PC]]
  15   // If we instrument using calls (default on x86), free is not the top frame
  16   // of the fault. With TCO the free frame can be replaced with the interceptor.
  17   // CHECK: in {{.*}}free
  18   // CHECK: freed by thread {{.*}} here:
  19   // CHECK: previously allocated by thread {{.*}} here:
  20   // CHECK: Memory tags around the buggy address (one tag corresponds to 16 bytes):
  21   // CHECK: =>{{.*}}[[MEM_TAG]]
  22   fprintf(stderr, "DONE\n");
  23   __hwasan_disable_allocator_tagging();
  24 // CHECK-NOT: DONE
  25 }