From f9b22e3bdb54acb2f830b3ebbad47ff17dfb5781 Mon Sep 17 00:00:00 2001 From: practicalswift Date: Tue, 28 Apr 2020 12:27:56 +0000 Subject: tests: Add fuzzing harness for CCoinsViewCache --- src/test/fuzz/coins_view.cpp | 294 +++++++++++++++++++++++++++++++++++++++++++ src/test/fuzz/util.h | 12 ++ 2 files changed, 306 insertions(+) create mode 100644 src/test/fuzz/coins_view.cpp (limited to 'src/test/fuzz') diff --git a/src/test/fuzz/coins_view.cpp b/src/test/fuzz/coins_view.cpp new file mode 100644 index 0000000000..52dd62a145 --- /dev/null +++ b/src/test/fuzz/coins_view.cpp @@ -0,0 +1,294 @@ +// Copyright (c) 2020 The Bitcoin Core developers +// Distributed under the MIT software license, see the accompanying +// file COPYING or http://www.opensource.org/licenses/mit-license.php. + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +namespace { +const Coin EMPTY_COIN{}; + +bool operator==(const Coin& a, const Coin& b) +{ + if (a.IsSpent() && b.IsSpent()) return true; + return a.fCoinBase == b.fCoinBase && a.nHeight == b.nHeight && a.out == b.out; +} +} // namespace + +void initialize() +{ + static const ECCVerifyHandle ecc_verify_handle; + ECC_Start(); + SelectParams(CBaseChainParams::REGTEST); +} + +void test_one_input(const std::vector& buffer) +{ + FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()}; + CCoinsView backend_coins_view; + CCoinsViewCache coins_view_cache{&backend_coins_view}; + COutPoint random_out_point; + Coin random_coin; + CMutableTransaction random_mutable_transaction; + while (fuzzed_data_provider.ConsumeBool()) { + switch (fuzzed_data_provider.ConsumeIntegralInRange(0, 9)) { + case 0: { + if (random_coin.IsSpent()) { + break; + } + Coin coin = random_coin; + bool expected_code_path = false; + const bool possible_overwrite = fuzzed_data_provider.ConsumeBool(); + try { + coins_view_cache.AddCoin(random_out_point, std::move(coin), possible_overwrite); + expected_code_path = true; + } catch (const std::logic_error& e) { + if (e.what() == std::string{"Attempted to overwrite an unspent coin (when possible_overwrite is false)"}) { + assert(!possible_overwrite); + expected_code_path = true; + } + } + assert(expected_code_path); + break; + } + case 1: { + (void)coins_view_cache.Flush(); + break; + } + case 2: { + coins_view_cache.SetBestBlock(ConsumeUInt256(fuzzed_data_provider)); + break; + } + case 3: { + Coin move_to; + (void)coins_view_cache.SpendCoin(random_out_point, fuzzed_data_provider.ConsumeBool() ? &move_to : nullptr); + break; + } + case 4: { + coins_view_cache.Uncache(random_out_point); + break; + } + case 5: { + if (fuzzed_data_provider.ConsumeBool()) { + backend_coins_view = CCoinsView{}; + } + coins_view_cache.SetBackend(backend_coins_view); + break; + } + case 6: { + const std::optional opt_out_point = ConsumeDeserializable(fuzzed_data_provider); + if (!opt_out_point) { + break; + } + random_out_point = *opt_out_point; + break; + } + case 7: { + const std::optional opt_coin = ConsumeDeserializable(fuzzed_data_provider); + if (!opt_coin) { + break; + } + random_coin = *opt_coin; + break; + } + case 8: { + const std::optional opt_mutable_transaction = ConsumeDeserializable(fuzzed_data_provider); + if (!opt_mutable_transaction) { + break; + } + random_mutable_transaction = *opt_mutable_transaction; + break; + } + case 9: { + CCoinsMap coins_map; + while (fuzzed_data_provider.ConsumeBool()) { + CCoinsCacheEntry coins_cache_entry; + coins_cache_entry.flags = fuzzed_data_provider.ConsumeIntegral(); + if (fuzzed_data_provider.ConsumeBool()) { + coins_cache_entry.coin = random_coin; + } else { + const std::optional opt_coin = ConsumeDeserializable(fuzzed_data_provider); + if (!opt_coin) { + break; + } + coins_cache_entry.coin = *opt_coin; + } + coins_map.emplace(random_out_point, std::move(coins_cache_entry)); + } + bool expected_code_path = false; + try { + coins_view_cache.BatchWrite(coins_map, fuzzed_data_provider.ConsumeBool() ? ConsumeUInt256(fuzzed_data_provider) : coins_view_cache.GetBestBlock()); + expected_code_path = true; + } catch (const std::logic_error& e) { + if (e.what() == std::string{"FRESH flag misapplied to coin that exists in parent cache"}) { + expected_code_path = true; + } + } + assert(expected_code_path); + break; + } + } + } + + { + const Coin& coin_using_access_coin = coins_view_cache.AccessCoin(random_out_point); + const bool exists_using_access_coin = !(coin_using_access_coin == EMPTY_COIN); + const bool exists_using_have_coin = coins_view_cache.HaveCoin(random_out_point); + const bool exists_using_have_coin_in_cache = coins_view_cache.HaveCoinInCache(random_out_point); + Coin coin_using_get_coin; + const bool exists_using_get_coin = coins_view_cache.GetCoin(random_out_point, coin_using_get_coin); + if (exists_using_get_coin) { + assert(coin_using_get_coin == coin_using_access_coin); + } + assert((exists_using_access_coin && exists_using_have_coin_in_cache && exists_using_have_coin && exists_using_get_coin) || + (!exists_using_access_coin && !exists_using_have_coin_in_cache && !exists_using_have_coin && !exists_using_get_coin)); + const bool exists_using_have_coin_in_backend = backend_coins_view.HaveCoin(random_out_point); + if (exists_using_have_coin_in_backend) { + assert(exists_using_have_coin); + } + Coin coin_using_backend_get_coin; + if (backend_coins_view.GetCoin(random_out_point, coin_using_backend_get_coin)) { + assert(exists_using_have_coin_in_backend); + assert(coin_using_get_coin == coin_using_backend_get_coin); + } else { + assert(!exists_using_have_coin_in_backend); + } + } + + { + bool expected_code_path = false; + try { + (void)coins_view_cache.Cursor(); + } catch (const std::logic_error&) { + expected_code_path = true; + } + assert(expected_code_path); + (void)coins_view_cache.DynamicMemoryUsage(); + (void)coins_view_cache.EstimateSize(); + (void)coins_view_cache.GetBestBlock(); + (void)coins_view_cache.GetCacheSize(); + (void)coins_view_cache.GetHeadBlocks(); + (void)coins_view_cache.HaveInputs(CTransaction{random_mutable_transaction}); + } + + { + const CCoinsViewCursor* coins_view_cursor = backend_coins_view.Cursor(); + assert(coins_view_cursor == nullptr); + (void)backend_coins_view.EstimateSize(); + (void)backend_coins_view.GetBestBlock(); + (void)backend_coins_view.GetHeadBlocks(); + } + + if (fuzzed_data_provider.ConsumeBool()) { + switch (fuzzed_data_provider.ConsumeIntegralInRange(0, 6)) { + case 0: { + const CTransaction transaction{random_mutable_transaction}; + bool is_spent = false; + for (const CTxOut& tx_out : transaction.vout) { + if (Coin{tx_out, 0, transaction.IsCoinBase()}.IsSpent()) { + is_spent = true; + } + } + if (is_spent) { + // Avoid: + // coins.cpp:69: void CCoinsViewCache::AddCoin(const COutPoint &, Coin &&, bool): Assertion `!coin.IsSpent()' failed. + break; + } + bool expected_code_path = false; + const int height = fuzzed_data_provider.ConsumeIntegral(); + const bool possible_overwrite = fuzzed_data_provider.ConsumeBool(); + try { + AddCoins(coins_view_cache, transaction, height, possible_overwrite); + expected_code_path = true; + } catch (const std::logic_error& e) { + if (e.what() == std::string{"Attempted to overwrite an unspent coin (when possible_overwrite is false)"}) { + assert(!possible_overwrite); + expected_code_path = true; + } + } + assert(expected_code_path); + break; + } + case 1: { + (void)AreInputsStandard(CTransaction{random_mutable_transaction}, coins_view_cache); + break; + } + case 2: { + TxValidationState state; + CAmount tx_fee_out; + const CTransaction transaction{random_mutable_transaction}; + if (ContainsSpentInput(transaction, coins_view_cache)) { + // Avoid: + // consensus/tx_verify.cpp:171: bool Consensus::CheckTxInputs(const CTransaction &, TxValidationState &, const CCoinsViewCache &, int, CAmount &): Assertion `!coin.IsSpent()' failed. + break; + } + try { + (void)Consensus::CheckTxInputs(transaction, state, coins_view_cache, fuzzed_data_provider.ConsumeIntegralInRange(0, std::numeric_limits::max()), tx_fee_out); + assert(MoneyRange(tx_fee_out)); + } catch (const std::runtime_error&) { + } + break; + } + case 3: { + const CTransaction transaction{random_mutable_transaction}; + if (ContainsSpentInput(transaction, coins_view_cache)) { + // Avoid: + // consensus/tx_verify.cpp:130: unsigned int GetP2SHSigOpCount(const CTransaction &, const CCoinsViewCache &): Assertion `!coin.IsSpent()' failed. + break; + } + (void)GetP2SHSigOpCount(transaction, coins_view_cache); + break; + } + case 4: { + const CTransaction transaction{random_mutable_transaction}; + if (ContainsSpentInput(transaction, coins_view_cache)) { + // Avoid: + // consensus/tx_verify.cpp:130: unsigned int GetP2SHSigOpCount(const CTransaction &, const CCoinsViewCache &): Assertion `!coin.IsSpent()' failed. + break; + } + const int flags = fuzzed_data_provider.ConsumeIntegral(); + if (!transaction.vin.empty() && (flags & SCRIPT_VERIFY_WITNESS) != 0 && (flags & SCRIPT_VERIFY_P2SH) == 0) { + // Avoid: + // script/interpreter.cpp:1705: size_t CountWitnessSigOps(const CScript &, const CScript &, const CScriptWitness *, unsigned int): Assertion `(flags & SCRIPT_VERIFY_P2SH) != 0' failed. + break; + } + (void)GetTransactionSigOpCost(transaction, coins_view_cache, flags); + break; + } + case 5: { + CCoinsStats stats; + bool expected_code_path = false; + try { + (void)GetUTXOStats(&coins_view_cache, stats); + } catch (const std::logic_error&) { + expected_code_path = true; + } + assert(expected_code_path); + break; + } + case 6: { + (void)IsWitnessStandard(CTransaction{random_mutable_transaction}, coins_view_cache); + break; + } + } + } +} diff --git a/src/test/fuzz/util.h b/src/test/fuzz/util.h index f72d9380eb..9d0fb02128 100644 --- a/src/test/fuzz/util.h +++ b/src/test/fuzz/util.h @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include