compiler-rt/test/hwasan/TestCases/use-after-free.c

   1 // RUN: %clang_hwasan -O0 -DISREAD=1 %s -o %t && not %run %t 2>&1 | FileCheck %s --check-prefixes=CHECK
   2 // RUN: %clang_hwasan -O1 -DISREAD=1 %s -o %t && not %run %t 2>&1 | FileCheck %s --check-prefixes=CHECK
   3 // RUN: %clang_hwasan -O2 -DISREAD=1 %s -o %t && not %run %t 2>&1 | FileCheck %s --check-prefixes=CHECK
   4 // RUN: %clang_hwasan -O3 -DISREAD=1 %s -o %t && not %run %t 2>&1 | FileCheck %s --check-prefixes=CHECK
   5
   6 // RUN: %clang_hwasan -O0 -DISREAD=0 %s -o %t && not %run %t 2>&1 | FileCheck %s --check-prefixes=CHECK
   7
   8 // REQUIRES: stable-runtime
   9
  10 #include <stdlib.h>
  11 #include <stdio.h>
  12 #include <sanitizer/hwasan_interface.h>
  13
  14 #include "utils.h"
  15
  16 int main() {
  17   __hwasan_enable_allocator_tagging();
  18   char * volatile x = (char*)malloc(10);
  19   free(x);
  20   __hwasan_disable_allocator_tagging();
  21   untag_fprintf(stderr, ISREAD ? "Going to do a READ\n" : "Going to do a WRITE\n");
  22   // CHECK: Going to do a [[TYPE:[A-Z]*]]
  23   int r = 0;
  24   if (ISREAD) r = x[5]; else x[5] = 42;  // should be on the same line.
  25   // CHECK: [[TYPE]] of size 1 at {{.*}} tags: [[PTR_TAG:[0-9a-f][0-9a-f]]]/[[MEM_TAG:[0-9a-f][0-9a-f]]] (ptr/mem)
  26   // CHECK: #0 {{.*}} in main {{.*}}use-after-free.c:[[@LINE-2]]
  27   // Offset is 5 or 11 depending on left/right alignment.
  28   // CHECK: is a small unallocated heap chunk; size: 32 offset: {{5|11}}
  29   // CHECK: is located 5 bytes inside of 10-byte region
  30   //
  31   // CHECK: freed by thread {{.*}} here:
  32   // CHECK: #0 {{.*}} in {{.*}}free{{.*}} {{.*}}hwasan_interceptors.cpp
  33   // CHECK: #1 {{.*}} in main {{.*}}use-after-free.c:[[@LINE-14]]
  34
  35   // CHECK: previously allocated here:
  36   // CHECK: #0 {{.*}} in {{.*}}malloc{{.*}} {{.*}}hwasan_interceptors.cpp
  37   // CHECK: #1 {{.*}} in main {{.*}}use-after-free.c:[[@LINE-19]]
  38   // CHECK: Memory tags around the buggy address (one tag corresponds to 16 bytes):
  39   // CHECK: =>{{.*}}[[MEM_TAG]]
  40   // CHECK: SUMMARY: HWAddressSanitizer: tag-mismatch {{.*}} in main
  41   return r;
  42 }