compiler-rt/test/asan/TestCases/debug_double_free.cpp

   1 // RUN: %clangxx_asan -O0 %s -o %t && not %run %t 2>&1 | FileCheck %s
   2
   3 #include <sanitizer/asan_interface.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6
   7 // If we use %p with MS CRTs, it comes out all upper case. Use %08x to get
   8 // lowercase hex.
   9 #ifdef _WIN32
  10 # ifdef _WIN64
  11 #  define PTR_FMT "0x%08llx"
  12 # else
  13 #  define PTR_FMT "0x%08x"
  14 # endif
  15 // Solaris libc omits the leading 0x.
  16 #elif defined(__sun__) && defined(__svr4__)
  17 # define PTR_FMT "0x%p"
  18 #else
  19 # define PTR_FMT "%p"
  20 #endif
  21
  22 char *heap_ptr;
  23
  24 int main() {
  25   // Disable stderr buffering. Needed on Windows.
  26   setvbuf(stderr, NULL, _IONBF, 0);
  27
  28   heap_ptr = (char *)malloc(10);
  29   fprintf(stderr, "heap_ptr: " PTR_FMT "\n", heap_ptr);
  30   // CHECK: heap_ptr: 0x[[ADDR:[0-9a-f]+]]
  31
  32   free(heap_ptr);
  33   free(heap_ptr);  // BOOM
  34   return 0;
  35 }
  36
  37 // Required for dyld macOS 12.0+
  38 #if (__APPLE__)
  39 __attribute__((weak))
  40 #endif
  41 extern "C" void
  42 __asan_on_error() {
  43   int present = __asan_report_present();
  44   void *addr = __asan_get_report_address();
  45   const char *description = __asan_get_report_description();
  46
  47   fprintf(stderr, "%s\n", (present == 1) ? "report present" : "");
  48   // CHECK: report present
  49   fprintf(stderr, "addr: " PTR_FMT "\n", addr);
  50   // CHECK: addr: {{0x0*}}[[ADDR]]
  51   fprintf(stderr, "description: %s\n", description);
  52   // CHECK: description: double-free
  53 }
  54
  55 // CHECK: AddressSanitizer: attempting double-free on {{0x0*}}[[ADDR]] in thread T0