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

   1 // RUN: %clangxx_asan -O0 %s -o %t && not %run %t 2>&1 | FileCheck %s
   2
   3 // Windows does not have execinfo.h. For now, be conservative and
   4 // restrict the test to glibc.
   5 // REQUIRES: glibc-2.27
   6
   7 // Test the backtrace_symbols() interceptor.
   8
   9 #include <assert.h>
  10 #include <execinfo.h>
  11 #include <math.h>
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14
  15 #define MAX_BT 100
  16
  17 int main() {
  18   void **buffer = (void **)malloc(sizeof(void *) * MAX_BT);
  19   assert(buffer != NULL);
  20
  21   int numEntries = backtrace(buffer, MAX_BT);
  22   printf("backtrace returned %d entries\n", numEntries);
  23
  24   free(buffer);
  25
  26   // Deliberate use-after-free of 'buffer'. We expect ASan to
  27   // catch this, without triggering internal sanitizer errors.
  28   char **strings = backtrace_symbols(buffer, numEntries);
  29   assert(strings != NULL);
  30
  31   for (int i = 0; i < numEntries; i++) {
  32     printf("%s\n", strings[i]);
  33   }
  34
  35   free(strings);
  36
  37   // CHECK: use-after-free
  38   // CHECK: SUMMARY
  39   return 0;
  40 }