multiplication_overflow.cpp raw

   1  // Copyright (c) 2020-present The Bitcoin Core developers
   2  // Distributed under the MIT software license, see the accompanying
   3  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   4  
   5  #include <test/fuzz/FuzzedDataProvider.h>
   6  #include <test/fuzz/fuzz.h>
   7  #include <test/fuzz/util.h>
   8  
   9  #include <cstdint>
  10  #include <string>
  11  #include <vector>
  12  
  13  namespace {
  14  template <typename T>
  15  void TestMultiplicationOverflow(FuzzedDataProvider& fuzzed_data_provider)
  16  {
  17      const T i = fuzzed_data_provider.ConsumeIntegral<T>();
  18      const T j = fuzzed_data_provider.ConsumeIntegral<T>();
  19      const bool is_multiplication_overflow_custom = MultiplicationOverflow(i, j);
  20  #ifndef _MSC_VER
  21      T result_builtin;
  22      const bool is_multiplication_overflow_builtin = __builtin_mul_overflow(i, j, &result_builtin);
  23      assert(is_multiplication_overflow_custom == is_multiplication_overflow_builtin);
  24      if (!is_multiplication_overflow_custom) {
  25          assert(i * j == result_builtin);
  26      }
  27  #else
  28      if (!is_multiplication_overflow_custom) {
  29          (void)(i * j);
  30      }
  31  #endif
  32  }
  33  } // namespace
  34  
  35  FUZZ_TARGET(multiplication_overflow)
  36  {
  37      FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
  38      TestMultiplicationOverflow<int64_t>(fuzzed_data_provider);
  39      TestMultiplicationOverflow<uint64_t>(fuzzed_data_provider);
  40      TestMultiplicationOverflow<int32_t>(fuzzed_data_provider);
  41      TestMultiplicationOverflow<uint32_t>(fuzzed_data_provider);
  42      TestMultiplicationOverflow<int16_t>(fuzzed_data_provider);
  43      TestMultiplicationOverflow<uint16_t>(fuzzed_data_provider);
  44      TestMultiplicationOverflow<char>(fuzzed_data_provider);
  45      TestMultiplicationOverflow<unsigned char>(fuzzed_data_provider);
  46      TestMultiplicationOverflow<signed char>(fuzzed_data_provider);
  47  }
  48