examples/new_buffer_overflow_fuzz_test.cc

// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <cstddef>
#include <cstdint>
#include <cstdio>
#include <cstring>

void TriggerBufferOverflow(const uint8_t *data, size_t size) {
  if (size >= 3 && data[0] == 'F' && data[1] == 'U' && data[2] == 'Z' &&
      data[size] == 'Z') {
    fprintf(stderr, "BUFFER OVERFLOW!\n");
  }
}

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
  uint8_t *data_copy = new uint8_t[size];
  memcpy(data_copy, data, size);
  TriggerBufferOverflow(data_copy, size);
  delete[] data_copy;
  return 0;
}