test/asan/TestCases/Windows/rtlallocateheap.cpp

// RUN: %clang_cl_asan -Od %s -Fe%t /MD
// RUN: %env_asan_opts=windows_hook_rtl_allocators=true not %run %t 2>&1 | FileCheck %s
// UNSUPPORTED: asan-64-bits
// REQUIRES: asan-rtl-heap-interception

#include <stdio.h>
#include <windows.h>

using AllocateFunctionPtr = PVOID(__stdcall *)(PVOID, ULONG, SIZE_T);
using FreeFunctionPtr = PVOID(__stdcall *)(PVOID, ULONG, PVOID);

int main() {
  HMODULE NtDllHandle = GetModuleHandle("ntdll.dll");
  if (!NtDllHandle) {
    puts("Couldn't load ntdll??");
    return -1;
  }

  auto RtlAllocateHeap_ptr = (AllocateFunctionPtr)GetProcAddress(NtDllHandle, "RtlAllocateHeap");
  if (RtlAllocateHeap_ptr == 0) {
    puts("Couldn't RtlAllocateHeap");
    return -1;
  }

  char *buffer;
  buffer = (char *)RtlAllocateHeap_ptr(GetProcessHeap(), 0, 32),
  buffer[33] = 'a';
  // CHECK: AddressSanitizer: heap-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
  // CHECK: WRITE of size 1 at [[ADDR]] thread T0
}