/ src / test / fuzz / util.h
util.h
  1  // Copyright (c) 2009-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  #ifndef BITCOIN_TEST_FUZZ_UTIL_H
  6  #define BITCOIN_TEST_FUZZ_UTIL_H
  7  
  8  #include <addresstype.h>
  9  #include <arith_uint256.h>
 10  #include <coins.h>
 11  #include <compat/compat.h>
 12  #include <consensus/amount.h>
 13  #include <consensus/consensus.h>
 14  #include <key.h>
 15  #include <merkleblock.h>
 16  #include <primitives/transaction.h>
 17  #include <script/script.h>
 18  #include <serialize.h>
 19  #include <streams.h>
 20  #include <test/fuzz/FuzzedDataProvider.h>
 21  #include <test/fuzz/fuzz.h>
 22  #include <uint256.h>
 23  
 24  #include <algorithm>
 25  #include <array>
 26  #include <cstdint>
 27  #include <cstdio>
 28  #include <optional>
 29  #include <string>
 30  #include <vector>
 31  
 32  class PeerManager;
 33  
 34  template <typename... Callables>
 35  size_t CallOneOf(FuzzedDataProvider& fuzzed_data_provider, Callables... callables)
 36  {
 37      constexpr size_t call_size{sizeof...(callables)};
 38      static_assert(call_size >= 1);
 39      const size_t call_index{fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, call_size - 1)};
 40  
 41      size_t i{0};
 42      ((i++ == call_index ? callables() : void()), ...);
 43      return call_size;
 44  }
 45  
 46  template <typename Collection>
 47  auto& PickValue(FuzzedDataProvider& fuzzed_data_provider, Collection& col)
 48  {
 49      auto sz{col.size()};
 50      assert(sz >= 1);
 51      auto it = col.begin();
 52      std::advance(it, fuzzed_data_provider.ConsumeIntegralInRange<decltype(sz)>(0, sz - 1));
 53      return *it;
 54  }
 55  
 56  template<typename B = uint8_t>
 57  [[nodiscard]] inline std::vector<B> ConsumeRandomLengthByteVector(FuzzedDataProvider& fuzzed_data_provider, const std::optional<size_t>& max_length = std::nullopt) noexcept
 58  {
 59      static_assert(sizeof(B) == 1);
 60      const std::string s = max_length ?
 61                                fuzzed_data_provider.ConsumeRandomLengthString(*max_length) :
 62                                fuzzed_data_provider.ConsumeRandomLengthString();
 63      std::vector<B> ret(s.size());
 64      std::copy(s.begin(), s.end(), reinterpret_cast<char*>(ret.data()));
 65      return ret;
 66  }
 67  
 68  [[nodiscard]] inline DataStream ConsumeDataStream(FuzzedDataProvider& fuzzed_data_provider, const std::optional<size_t>& max_length = std::nullopt) noexcept
 69  {
 70      return DataStream{ConsumeRandomLengthByteVector(fuzzed_data_provider, max_length)};
 71  }
 72  
 73  [[nodiscard]] inline std::vector<std::string> ConsumeRandomLengthStringVector(FuzzedDataProvider& fuzzed_data_provider, const size_t max_vector_size = 16, const size_t max_string_length = 16) noexcept
 74  {
 75      const size_t n_elements = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, max_vector_size);
 76      std::vector<std::string> r;
 77      r.reserve(n_elements);
 78      for (size_t i = 0; i < n_elements; ++i) {
 79          r.push_back(fuzzed_data_provider.ConsumeRandomLengthString(max_string_length));
 80      }
 81      return r;
 82  }
 83  
 84  template <typename T>
 85  [[nodiscard]] inline std::vector<T> ConsumeRandomLengthIntegralVector(FuzzedDataProvider& fuzzed_data_provider, const size_t max_vector_size = 16) noexcept
 86  {
 87      const size_t n_elements = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, max_vector_size);
 88      std::vector<T> r;
 89      r.reserve(n_elements);
 90      for (size_t i = 0; i < n_elements; ++i) {
 91          r.push_back(fuzzed_data_provider.ConsumeIntegral<T>());
 92      }
 93      return r;
 94  }
 95  
 96  template <typename P>
 97  [[nodiscard]] P ConsumeDeserializationParams(FuzzedDataProvider& fuzzed_data_provider) noexcept;
 98  
 99  template <typename T, typename P>
100  [[nodiscard]] std::optional<T> ConsumeDeserializable(FuzzedDataProvider& fuzzed_data_provider, const P& params, const std::optional<size_t>& max_length = std::nullopt) noexcept
101  {
102      const std::vector<uint8_t> buffer{ConsumeRandomLengthByteVector(fuzzed_data_provider, max_length)};
103      SpanReader ds{buffer};
104      T obj;
105      try {
106          ds >> params(obj);
107      } catch (const std::ios_base::failure&) {
108          return std::nullopt;
109      }
110      return obj;
111  }
112  
113  template <typename T>
114  [[nodiscard]] inline std::optional<T> ConsumeDeserializable(FuzzedDataProvider& fuzzed_data_provider, const std::optional<size_t>& max_length = std::nullopt) noexcept
115  {
116      const std::vector<uint8_t> buffer = ConsumeRandomLengthByteVector(fuzzed_data_provider, max_length);
117      SpanReader ds{buffer};
118      T obj;
119      try {
120          ds >> obj;
121      } catch (const std::ios_base::failure&) {
122          return std::nullopt;
123      }
124      return obj;
125  }
126  
127  template <typename WeakEnumType, size_t size>
128  [[nodiscard]] WeakEnumType ConsumeWeakEnum(FuzzedDataProvider& fuzzed_data_provider, const WeakEnumType (&all_types)[size]) noexcept
129  {
130      return fuzzed_data_provider.ConsumeBool() ?
131                 fuzzed_data_provider.PickValueInArray<WeakEnumType>(all_types) :
132                 WeakEnumType(fuzzed_data_provider.ConsumeIntegral<std::underlying_type_t<WeakEnumType>>());
133  }
134  
135  [[nodiscard]] inline opcodetype ConsumeOpcodeType(FuzzedDataProvider& fuzzed_data_provider) noexcept
136  {
137      return static_cast<opcodetype>(fuzzed_data_provider.ConsumeIntegralInRange<uint32_t>(0, MAX_OPCODE));
138  }
139  
140  [[nodiscard]] CAmount ConsumeMoney(FuzzedDataProvider& fuzzed_data_provider, const std::optional<CAmount>& max = std::nullopt) noexcept;
141  
142  [[nodiscard]] NodeSeconds ConsumeTime(FuzzedDataProvider& fuzzed_data_provider, const std::optional<int64_t>& min = std::nullopt, const std::optional<int64_t>& max = std::nullopt) noexcept;
143  [[nodiscard]] std::chrono::seconds ConsumeDuration(FuzzedDataProvider& fuzzed_data_provider, std::chrono::seconds min, std::chrono::seconds max) noexcept;
144  
145  [[nodiscard]] CMutableTransaction ConsumeTransaction(FuzzedDataProvider& fuzzed_data_provider, const std::optional<std::vector<Txid>>& prevout_txids, int max_num_in = 10, int max_num_out = 10) noexcept;
146  
147  [[nodiscard]] CScriptWitness ConsumeScriptWitness(FuzzedDataProvider& fuzzed_data_provider, size_t max_stack_elem_size = 32) noexcept;
148  
149  [[nodiscard]] CScript ConsumeScript(FuzzedDataProvider& fuzzed_data_provider, bool maybe_p2wsh = false) noexcept;
150  
151  [[nodiscard]] uint32_t ConsumeSequence(FuzzedDataProvider& fuzzed_data_provider) noexcept;
152  
153  [[nodiscard]] inline CScriptNum ConsumeScriptNum(FuzzedDataProvider& fuzzed_data_provider) noexcept
154  {
155      return CScriptNum{fuzzed_data_provider.ConsumeIntegral<int64_t>()};
156  }
157  
158  [[nodiscard]] inline uint160 ConsumeUInt160(FuzzedDataProvider& fuzzed_data_provider) noexcept
159  {
160      const std::vector<uint8_t> v160 = fuzzed_data_provider.ConsumeBytes<uint8_t>(160 / 8);
161      if (v160.size() != 160 / 8) {
162          return {};
163      }
164      return uint160{v160};
165  }
166  
167  [[nodiscard]] inline uint256 ConsumeUInt256(FuzzedDataProvider& fuzzed_data_provider) noexcept
168  {
169      const std::vector<uint8_t> v256 = fuzzed_data_provider.ConsumeBytes<uint8_t>(256 / 8);
170      if (v256.size() != 256 / 8) {
171          return {};
172      }
173      return uint256{v256};
174  }
175  
176  [[nodiscard]] inline arith_uint256 ConsumeArithUInt256(FuzzedDataProvider& fuzzed_data_provider) noexcept
177  {
178      return UintToArith256(ConsumeUInt256(fuzzed_data_provider));
179  }
180  
181  [[nodiscard]] inline arith_uint256 ConsumeArithUInt256InRange(FuzzedDataProvider& fuzzed_data_provider, const arith_uint256& min, const arith_uint256& max) noexcept
182  {
183      assert(min <= max);
184      const arith_uint256 range = max - min;
185      const arith_uint256 value = ConsumeArithUInt256(fuzzed_data_provider);
186      arith_uint256 result = value;
187      // Avoid division by 0, in case range + 1 results in overflow.
188      if (range != ~arith_uint256(0)) {
189          const arith_uint256 quotient = value / (range + 1);
190          result = value - (quotient * (range + 1));
191      }
192      result += min;
193      assert(result >= min && result <= max);
194      return result;
195  }
196  
197  [[nodiscard]] std::map<COutPoint, Coin> ConsumeCoins(FuzzedDataProvider& fuzzed_data_provider) noexcept;
198  
199  [[nodiscard]] CTxDestination ConsumeTxDestination(FuzzedDataProvider& fuzzed_data_provider) noexcept;
200  
201  [[nodiscard]] CKey ConsumePrivateKey(FuzzedDataProvider& fuzzed_data_provider, std::optional<bool> compressed = std::nullopt) noexcept;
202  
203  template <typename T>
204  [[nodiscard]] bool MultiplicationOverflow(const T i, const T j) noexcept
205  {
206      static_assert(std::is_integral_v<T>, "Integral required.");
207      if (std::numeric_limits<T>::is_signed) {
208          if (i > 0) {
209              if (j > 0) {
210                  return i > (std::numeric_limits<T>::max() / j);
211              } else {
212                  return j < (std::numeric_limits<T>::min() / i);
213              }
214          } else {
215              if (j > 0) {
216                  return i < (std::numeric_limits<T>::min() / j);
217              } else {
218                  return i != 0 && (j < (std::numeric_limits<T>::max() / i));
219              }
220          }
221      } else {
222          return j != 0 && i > std::numeric_limits<T>::max() / j;
223      }
224  }
225  
226  [[nodiscard]] bool ContainsSpentInput(const CTransaction& tx, const CCoinsViewCache& inputs) noexcept;
227  
228  /**
229   * Sets errno to a value selected from the given std::array `errnos`.
230   */
231  template <typename T, size_t size>
232  void SetFuzzedErrNo(FuzzedDataProvider& fuzzed_data_provider, const std::array<T, size>& errnos)
233  {
234      errno = fuzzed_data_provider.PickValueInArray(errnos);
235  }
236  
237  /*
238   * Sets a fuzzed errno in the range [0, 133 (EHWPOISON)]. Can be used from functions emulating
239   * standard library functions that set errno, or in other contexts where the value of errno
240   * might be relevant for the execution path that will be taken.
241   */
242  inline void SetFuzzedErrNo(FuzzedDataProvider& fuzzed_data_provider) noexcept
243  {
244      errno = fuzzed_data_provider.ConsumeIntegralInRange<int>(0, 133);
245  }
246  
247  /**
248   * Returns a byte vector of specified size regardless of the number of remaining bytes available
249   * from the fuzzer. Pads with zero value bytes if needed to achieve the specified size.
250   */
251  template<typename B = uint8_t>
252  [[nodiscard]] inline std::vector<B> ConsumeFixedLengthByteVector(FuzzedDataProvider& fuzzed_data_provider, const size_t length) noexcept
253  {
254      static_assert(sizeof(B) == 1);
255      auto random_bytes = fuzzed_data_provider.ConsumeBytes<B>(length);
256      random_bytes.resize(length);
257      return random_bytes;
258  }
259  
260  class FuzzedFileProvider
261  {
262      FuzzedDataProvider& m_fuzzed_data_provider;
263      int64_t m_offset = 0;
264  
265  public:
266      FuzzedFileProvider(FuzzedDataProvider& fuzzed_data_provider) : m_fuzzed_data_provider{fuzzed_data_provider}
267      {
268      }
269  
270      FILE* open();
271  
272      static ssize_t read(void* cookie, char* buf, size_t size);
273  
274      static ssize_t write(void* cookie, const char* buf, size_t size);
275  
276      static int seek(void* cookie, int64_t* offset, int whence);
277  
278      static int close(void* cookie);
279  };
280  
281  #define WRITE_TO_STREAM_CASE(type, consume) \
282      [&] {                                   \
283          type o = consume;                   \
284          stream << o;                        \
285      }
286  template <typename Stream>
287  void WriteToStream(FuzzedDataProvider& fuzzed_data_provider, Stream& stream) noexcept
288  {
289      while (fuzzed_data_provider.ConsumeBool()) {
290          try {
291              CallOneOf(
292                  fuzzed_data_provider,
293                  WRITE_TO_STREAM_CASE(bool, fuzzed_data_provider.ConsumeBool()),
294                  WRITE_TO_STREAM_CASE(int8_t, fuzzed_data_provider.ConsumeIntegral<int8_t>()),
295                  WRITE_TO_STREAM_CASE(uint8_t, fuzzed_data_provider.ConsumeIntegral<uint8_t>()),
296                  WRITE_TO_STREAM_CASE(int16_t, fuzzed_data_provider.ConsumeIntegral<int16_t>()),
297                  WRITE_TO_STREAM_CASE(uint16_t, fuzzed_data_provider.ConsumeIntegral<uint16_t>()),
298                  WRITE_TO_STREAM_CASE(int32_t, fuzzed_data_provider.ConsumeIntegral<int32_t>()),
299                  WRITE_TO_STREAM_CASE(uint32_t, fuzzed_data_provider.ConsumeIntegral<uint32_t>()),
300                  WRITE_TO_STREAM_CASE(int64_t, fuzzed_data_provider.ConsumeIntegral<int64_t>()),
301                  WRITE_TO_STREAM_CASE(uint64_t, fuzzed_data_provider.ConsumeIntegral<uint64_t>()),
302                  WRITE_TO_STREAM_CASE(std::string, fuzzed_data_provider.ConsumeRandomLengthString(32)),
303                  WRITE_TO_STREAM_CASE(std::vector<uint8_t>, ConsumeRandomLengthIntegralVector<uint8_t>(fuzzed_data_provider)));
304          } catch (const std::ios_base::failure&) {
305              break;
306          }
307      }
308  }
309  
310  #define READ_FROM_STREAM_CASE(type) \
311      [&] {                           \
312          type o;                     \
313          stream >> o;                \
314      }
315  template <typename Stream>
316  void ReadFromStream(FuzzedDataProvider& fuzzed_data_provider, Stream& stream) noexcept
317  {
318      while (fuzzed_data_provider.ConsumeBool()) {
319          try {
320              CallOneOf(
321                  fuzzed_data_provider,
322                  READ_FROM_STREAM_CASE(bool),
323                  READ_FROM_STREAM_CASE(int8_t),
324                  READ_FROM_STREAM_CASE(uint8_t),
325                  READ_FROM_STREAM_CASE(int16_t),
326                  READ_FROM_STREAM_CASE(uint16_t),
327                  READ_FROM_STREAM_CASE(int32_t),
328                  READ_FROM_STREAM_CASE(uint32_t),
329                  READ_FROM_STREAM_CASE(int64_t),
330                  READ_FROM_STREAM_CASE(uint64_t),
331                  READ_FROM_STREAM_CASE(std::string),
332                  READ_FROM_STREAM_CASE(std::vector<uint8_t>));
333          } catch (const std::ios_base::failure&) {
334              break;
335          }
336      }
337  }
338  
339  #endif // BITCOIN_TEST_FUZZ_UTIL_H