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 // FIXME: Doesn't work with DLLs
   8 // XFAIL: win32-dynamic-asan
   9
  10 // If we use %p with MSVC, it comes out all upper case. Use %08x to get
  11 // lowercase hex.
  12 #ifdef _MSC_VER
  13 # ifdef _WIN64
  14 #  define PTR_FMT "0x%08llx"
  15 # else
  16 #  define PTR_FMT "0x%08x"
  17 # endif
  18 // Solaris libc omits the leading 0x.
  19 #elif defined(__sun__) && defined(__svr4__)
  20 # define PTR_FMT "0x%p"
  21 #else
  22 # define PTR_FMT "%p"
  23 #endif
  24
  25 char *heap_ptr;
  26
  27 int main() {
  28   // Disable stderr buffering. Needed on Windows.
  29   setvbuf(stderr, NULL, _IONBF, 0);
  30
  31   heap_ptr = (char *)malloc(10);
  32   fprintf(stderr, "heap_ptr: " PTR_FMT "\n", heap_ptr);
  33   // CHECK: heap_ptr: 0x[[ADDR:[0-9a-f]+]]
  34
  35   free(heap_ptr);
  36   free(heap_ptr);  // BOOM
  37   return 0;
  38 }
  39
  40 // Required for dyld macOS 12.0+
  41 #if (__APPLE__)
  42 __attribute__((weak))
  43 #endif
  44 extern "C" void
  45 __asan_on_error() {
  46   int present = __asan_report_present();
  47   void *addr = __asan_get_report_address();
  48   const char *description = __asan_get_report_description();
  49
  50   fprintf(stderr, "%s\n", (present == 1) ? "report present" : "");
  51   // CHECK: report present
  52   fprintf(stderr, "addr: " PTR_FMT "\n", addr);
  53   // CHECK: addr: {{0x0*}}[[ADDR]]
  54   fprintf(stderr, "description: %s\n", description);
  55   // CHECK: description: double-free
  56 }
  57
  58 // CHECK: AddressSanitizer: attempting double-free on {{0x0*}}[[ADDR]] in thread T0