src/compiler-rt/test/asan/TestCases/Posix/new_array_cookie_uaf_test.cc

   1 // REQUIRES: asan-64-bits
   2 // RUN: %clangxx_asan -O3 %s -o %t
   3 // RUN: %env_asan_opts=poison_array_cookie=1 not %run %t 2>&1  | FileCheck %s --check-prefix=COOKIE
   4 // RUN: %env_asan_opts=poison_array_cookie=0 not %run %t 2>&1  | FileCheck %s --check-prefix=NO_COOKIE
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <assert.h>
   8 int dtor_counter;
   9 struct C {
  10   int x;
  11   ~C() {
  12     dtor_counter++;
  13     fprintf(stderr, "DTOR %d\n", dtor_counter);
  14   }
  15 };
  16
  17 __attribute__((noinline)) void Delete(C *c) { delete[] c; }
  18 __attribute__((no_sanitize_address)) void Write42ToCookie(C *c) {
  19   long *p = reinterpret_cast<long*>(c);
  20   p[-1] = 42;
  21 }
  22
  23 int main(int argc, char **argv) {
  24   C *buffer = new C[argc];
  25   delete [] buffer;
  26   Write42ToCookie(buffer);
  27   delete [] buffer;
  28 // COOKIE: DTOR 1
  29 // COOKIE-NOT: DTOR 2
  30 // COOKIE: AddressSanitizer: loaded array cookie from free-d memory
  31 // COOKIE: AddressSanitizer: attempting double-free
  32 // NO_COOKIE: DTOR 1
  33 // NO_COOKIE: DTOR 43
  34 // NO_COOKIE-NOT: DTOR 44
  35 // NO_COOKIE-NOT: AddressSanitizer: loaded array cookie from free-d memory
  36 // NO_COOKIE: AddressSanitizer: attempting double-free
  37
  38 }