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| 1 | +// Copyright (c) 2020 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 <amount.h> |
| 6 | +#include <chainparams.h> |
| 7 | +#include <chainparamsbase.h> |
| 8 | +#include <coins.h> |
| 9 | +#include <consensus/tx_verify.h> |
| 10 | +#include <consensus/validation.h> |
| 11 | +#include <key.h> |
| 12 | +#include <node/coinstats.h> |
| 13 | +#include <policy/policy.h> |
| 14 | +#include <primitives/transaction.h> |
| 15 | +#include <pubkey.h> |
| 16 | +#include <test/fuzz/FuzzedDataProvider.h> |
| 17 | +#include <test/fuzz/fuzz.h> |
| 18 | +#include <test/fuzz/util.h> |
| 19 | +#include <validation.h> |
| 20 | + |
| 21 | +#include <cstdint> |
| 22 | +#include <limits> |
| 23 | +#include <optional> |
| 24 | +#include <string> |
| 25 | +#include <vector> |
| 26 | + |
| 27 | +namespace { |
| 28 | +const Coin EMPTY_COIN{}; |
| 29 | + |
| 30 | +bool operator==(const Coin& a, const Coin& b) |
| 31 | +{ |
| 32 | + if (a.IsSpent() && b.IsSpent()) return true; |
| 33 | + return a.fCoinBase == b.fCoinBase && a.nHeight == b.nHeight && a.out == b.out; |
| 34 | +} |
| 35 | +} // namespace |
| 36 | + |
| 37 | +void initialize() |
| 38 | +{ |
| 39 | + static const ECCVerifyHandle ecc_verify_handle; |
| 40 | + ECC_Start(); |
| 41 | + SelectParams(CBaseChainParams::REGTEST); |
| 42 | +} |
| 43 | + |
| 44 | +void test_one_input(const std::vector<uint8_t>& buffer) |
| 45 | +{ |
| 46 | + FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()}; |
| 47 | + CCoinsView backend_coins_view; |
| 48 | + CCoinsViewCache coins_view_cache{&backend_coins_view}; |
| 49 | + COutPoint random_out_point; |
| 50 | + Coin random_coin; |
| 51 | + CMutableTransaction random_mutable_transaction; |
| 52 | + while (fuzzed_data_provider.ConsumeBool()) { |
| 53 | + switch (fuzzed_data_provider.ConsumeIntegralInRange<int>(0, 9)) { |
| 54 | + case 0: { |
| 55 | + if (random_coin.IsSpent()) { |
| 56 | + break; |
| 57 | + } |
| 58 | + Coin coin = random_coin; |
| 59 | + bool expected_code_path = false; |
| 60 | + const bool possible_overwrite = fuzzed_data_provider.ConsumeBool(); |
| 61 | + try { |
| 62 | + coins_view_cache.AddCoin(random_out_point, std::move(coin), possible_overwrite); |
| 63 | + expected_code_path = true; |
| 64 | + } catch (const std::logic_error& e) { |
| 65 | + if (e.what() == std::string{"Attempted to overwrite an unspent coin (when possible_overwrite is false)"}) { |
| 66 | + assert(!possible_overwrite); |
| 67 | + expected_code_path = true; |
| 68 | + } |
| 69 | + } |
| 70 | + assert(expected_code_path); |
| 71 | + break; |
| 72 | + } |
| 73 | + case 1: { |
| 74 | + (void)coins_view_cache.Flush(); |
| 75 | + break; |
| 76 | + } |
| 77 | + case 2: { |
| 78 | + coins_view_cache.SetBestBlock(ConsumeUInt256(fuzzed_data_provider)); |
| 79 | + break; |
| 80 | + } |
| 81 | + case 3: { |
| 82 | + Coin move_to; |
| 83 | + (void)coins_view_cache.SpendCoin(random_out_point, fuzzed_data_provider.ConsumeBool() ? &move_to : nullptr); |
| 84 | + break; |
| 85 | + } |
| 86 | + case 4: { |
| 87 | + coins_view_cache.Uncache(random_out_point); |
| 88 | + break; |
| 89 | + } |
| 90 | + case 5: { |
| 91 | + if (fuzzed_data_provider.ConsumeBool()) { |
| 92 | + backend_coins_view = CCoinsView{}; |
| 93 | + } |
| 94 | + coins_view_cache.SetBackend(backend_coins_view); |
| 95 | + break; |
| 96 | + } |
| 97 | + case 6: { |
| 98 | + const std::optional<COutPoint> opt_out_point = ConsumeDeserializable<COutPoint>(fuzzed_data_provider); |
| 99 | + if (!opt_out_point) { |
| 100 | + break; |
| 101 | + } |
| 102 | + random_out_point = *opt_out_point; |
| 103 | + break; |
| 104 | + } |
| 105 | + case 7: { |
| 106 | + const std::optional<Coin> opt_coin = ConsumeDeserializable<Coin>(fuzzed_data_provider); |
| 107 | + if (!opt_coin) { |
| 108 | + break; |
| 109 | + } |
| 110 | + random_coin = *opt_coin; |
| 111 | + break; |
| 112 | + } |
| 113 | + case 8: { |
| 114 | + const std::optional<CMutableTransaction> opt_mutable_transaction = ConsumeDeserializable<CMutableTransaction>(fuzzed_data_provider); |
| 115 | + if (!opt_mutable_transaction) { |
| 116 | + break; |
| 117 | + } |
| 118 | + random_mutable_transaction = *opt_mutable_transaction; |
| 119 | + break; |
| 120 | + } |
| 121 | + case 9: { |
| 122 | + CCoinsMap coins_map; |
| 123 | + while (fuzzed_data_provider.ConsumeBool()) { |
| 124 | + CCoinsCacheEntry coins_cache_entry; |
| 125 | + coins_cache_entry.flags = fuzzed_data_provider.ConsumeIntegral<unsigned char>(); |
| 126 | + if (fuzzed_data_provider.ConsumeBool()) { |
| 127 | + coins_cache_entry.coin = random_coin; |
| 128 | + } else { |
| 129 | + const std::optional<Coin> opt_coin = ConsumeDeserializable<Coin>(fuzzed_data_provider); |
| 130 | + if (!opt_coin) { |
| 131 | + break; |
| 132 | + } |
| 133 | + coins_cache_entry.coin = *opt_coin; |
| 134 | + } |
| 135 | + coins_map.emplace(random_out_point, std::move(coins_cache_entry)); |
| 136 | + } |
| 137 | + bool expected_code_path = false; |
| 138 | + try { |
| 139 | + coins_view_cache.BatchWrite(coins_map, fuzzed_data_provider.ConsumeBool() ? ConsumeUInt256(fuzzed_data_provider) : coins_view_cache.GetBestBlock()); |
| 140 | + expected_code_path = true; |
| 141 | + } catch (const std::logic_error& e) { |
| 142 | + if (e.what() == std::string{"FRESH flag misapplied to coin that exists in parent cache"}) { |
| 143 | + expected_code_path = true; |
| 144 | + } |
| 145 | + } |
| 146 | + assert(expected_code_path); |
| 147 | + break; |
| 148 | + } |
| 149 | + } |
| 150 | + } |
| 151 | + |
| 152 | + { |
| 153 | + const Coin& coin_using_access_coin = coins_view_cache.AccessCoin(random_out_point); |
| 154 | + const bool exists_using_access_coin = !(coin_using_access_coin == EMPTY_COIN); |
| 155 | + const bool exists_using_have_coin = coins_view_cache.HaveCoin(random_out_point); |
| 156 | + const bool exists_using_have_coin_in_cache = coins_view_cache.HaveCoinInCache(random_out_point); |
| 157 | + Coin coin_using_get_coin; |
| 158 | + const bool exists_using_get_coin = coins_view_cache.GetCoin(random_out_point, coin_using_get_coin); |
| 159 | + if (exists_using_get_coin) { |
| 160 | + assert(coin_using_get_coin == coin_using_access_coin); |
| 161 | + } |
| 162 | + assert((exists_using_access_coin && exists_using_have_coin_in_cache && exists_using_have_coin && exists_using_get_coin) || |
| 163 | + (!exists_using_access_coin && !exists_using_have_coin_in_cache && !exists_using_have_coin && !exists_using_get_coin)); |
| 164 | + const bool exists_using_have_coin_in_backend = backend_coins_view.HaveCoin(random_out_point); |
| 165 | + if (exists_using_have_coin_in_backend) { |
| 166 | + assert(exists_using_have_coin); |
| 167 | + } |
| 168 | + Coin coin_using_backend_get_coin; |
| 169 | + if (backend_coins_view.GetCoin(random_out_point, coin_using_backend_get_coin)) { |
| 170 | + assert(exists_using_have_coin_in_backend); |
| 171 | + assert(coin_using_get_coin == coin_using_backend_get_coin); |
| 172 | + } else { |
| 173 | + assert(!exists_using_have_coin_in_backend); |
| 174 | + } |
| 175 | + } |
| 176 | + |
| 177 | + { |
| 178 | + bool expected_code_path = false; |
| 179 | + try { |
| 180 | + (void)coins_view_cache.Cursor(); |
| 181 | + } catch (const std::logic_error&) { |
| 182 | + expected_code_path = true; |
| 183 | + } |
| 184 | + assert(expected_code_path); |
| 185 | + (void)coins_view_cache.DynamicMemoryUsage(); |
| 186 | + (void)coins_view_cache.EstimateSize(); |
| 187 | + (void)coins_view_cache.GetBestBlock(); |
| 188 | + (void)coins_view_cache.GetCacheSize(); |
| 189 | + (void)coins_view_cache.GetHeadBlocks(); |
| 190 | + (void)coins_view_cache.HaveInputs(CTransaction{random_mutable_transaction}); |
| 191 | + } |
| 192 | + |
| 193 | + { |
| 194 | + const CCoinsViewCursor* coins_view_cursor = backend_coins_view.Cursor(); |
| 195 | + assert(coins_view_cursor == nullptr); |
| 196 | + (void)backend_coins_view.EstimateSize(); |
| 197 | + (void)backend_coins_view.GetBestBlock(); |
| 198 | + (void)backend_coins_view.GetHeadBlocks(); |
| 199 | + } |
| 200 | + |
| 201 | + if (fuzzed_data_provider.ConsumeBool()) { |
| 202 | + switch (fuzzed_data_provider.ConsumeIntegralInRange<int>(0, 6)) { |
| 203 | + case 0: { |
| 204 | + const CTransaction transaction{random_mutable_transaction}; |
| 205 | + bool is_spent = false; |
| 206 | + for (const CTxOut& tx_out : transaction.vout) { |
| 207 | + if (Coin{tx_out, 0, transaction.IsCoinBase()}.IsSpent()) { |
| 208 | + is_spent = true; |
| 209 | + } |
| 210 | + } |
| 211 | + if (is_spent) { |
| 212 | + // Avoid: |
| 213 | + // coins.cpp:69: void CCoinsViewCache::AddCoin(const COutPoint &, Coin &&, bool): Assertion `!coin.IsSpent()' failed. |
| 214 | + break; |
| 215 | + } |
| 216 | + bool expected_code_path = false; |
| 217 | + const int height = fuzzed_data_provider.ConsumeIntegral<int>(); |
| 218 | + const bool possible_overwrite = fuzzed_data_provider.ConsumeBool(); |
| 219 | + try { |
| 220 | + AddCoins(coins_view_cache, transaction, height, possible_overwrite); |
| 221 | + expected_code_path = true; |
| 222 | + } catch (const std::logic_error& e) { |
| 223 | + if (e.what() == std::string{"Attempted to overwrite an unspent coin (when possible_overwrite is false)"}) { |
| 224 | + assert(!possible_overwrite); |
| 225 | + expected_code_path = true; |
| 226 | + } |
| 227 | + } |
| 228 | + assert(expected_code_path); |
| 229 | + break; |
| 230 | + } |
| 231 | + case 1: { |
| 232 | + (void)AreInputsStandard(CTransaction{random_mutable_transaction}, coins_view_cache); |
| 233 | + break; |
| 234 | + } |
| 235 | + case 2: { |
| 236 | + TxValidationState state; |
| 237 | + CAmount tx_fee_out; |
| 238 | + const CTransaction transaction{random_mutable_transaction}; |
| 239 | + if (ContainsSpentInput(transaction, coins_view_cache)) { |
| 240 | + // Avoid: |
| 241 | + // consensus/tx_verify.cpp:171: bool Consensus::CheckTxInputs(const CTransaction &, TxValidationState &, const CCoinsViewCache &, int, CAmount &): Assertion `!coin.IsSpent()' failed. |
| 242 | + break; |
| 243 | + } |
| 244 | + try { |
| 245 | + (void)Consensus::CheckTxInputs(transaction, state, coins_view_cache, fuzzed_data_provider.ConsumeIntegralInRange<int>(0, std::numeric_limits<int>::max()), tx_fee_out); |
| 246 | + assert(MoneyRange(tx_fee_out)); |
| 247 | + } catch (const std::runtime_error&) { |
| 248 | + } |
| 249 | + break; |
| 250 | + } |
| 251 | + case 3: { |
| 252 | + const CTransaction transaction{random_mutable_transaction}; |
| 253 | + if (ContainsSpentInput(transaction, coins_view_cache)) { |
| 254 | + // Avoid: |
| 255 | + // consensus/tx_verify.cpp:130: unsigned int GetP2SHSigOpCount(const CTransaction &, const CCoinsViewCache &): Assertion `!coin.IsSpent()' failed. |
| 256 | + break; |
| 257 | + } |
| 258 | + (void)GetP2SHSigOpCount(transaction, coins_view_cache); |
| 259 | + break; |
| 260 | + } |
| 261 | + case 4: { |
| 262 | + const CTransaction transaction{random_mutable_transaction}; |
| 263 | + if (ContainsSpentInput(transaction, coins_view_cache)) { |
| 264 | + // Avoid: |
| 265 | + // consensus/tx_verify.cpp:130: unsigned int GetP2SHSigOpCount(const CTransaction &, const CCoinsViewCache &): Assertion `!coin.IsSpent()' failed. |
| 266 | + break; |
| 267 | + } |
| 268 | + const int flags = fuzzed_data_provider.ConsumeIntegral<int>(); |
| 269 | + if (!transaction.vin.empty() && (flags & SCRIPT_VERIFY_WITNESS) != 0 && (flags & SCRIPT_VERIFY_P2SH) == 0) { |
| 270 | + // Avoid: |
| 271 | + // script/interpreter.cpp:1705: size_t CountWitnessSigOps(const CScript &, const CScript &, const CScriptWitness *, unsigned int): Assertion `(flags & SCRIPT_VERIFY_P2SH) != 0' failed. |
| 272 | + break; |
| 273 | + } |
| 274 | + (void)GetTransactionSigOpCost(transaction, coins_view_cache, flags); |
| 275 | + break; |
| 276 | + } |
| 277 | + case 5: { |
| 278 | + CCoinsStats stats; |
| 279 | + bool expected_code_path = false; |
| 280 | + try { |
| 281 | + (void)GetUTXOStats(&coins_view_cache, stats); |
| 282 | + } catch (const std::logic_error&) { |
| 283 | + expected_code_path = true; |
| 284 | + } |
| 285 | + assert(expected_code_path); |
| 286 | + break; |
| 287 | + } |
| 288 | + case 6: { |
| 289 | + (void)IsWitnessStandard(CTransaction{random_mutable_transaction}, coins_view_cache); |
| 290 | + break; |
| 291 | + } |
| 292 | + } |
| 293 | + } |
| 294 | +} |
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