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coins_view.cpp
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coins_view.cpp
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// Copyright (c) 2020-2022 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 <chainparams.h>
#include <coins.h>
#include <consensus/amount.h>
#include <consensus/tx_check.h>
#include <consensus/tx_verify.h>
#include <consensus/validation.h>
#include <key.h>
#include <policy/policy.h>
#include <primitives/transaction.h>
#include <pubkey.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util.h>
#include <test/util/setup_common.h>
#include <validation.h>
#include <cstdint>
#include <limits>
#include <optional>
#include <string>
#include <vector>
namespace {
const TestingSetup* g_setup;
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_coins_view()
{
static const auto testing_setup = MakeNoLogFileContext<const TestingSetup>();
g_setup = testing_setup.get();
}
FUZZ_TARGET(coins_view, .init = initialize_coins_view)
{
FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
CCoinsView backend_coins_view;
CCoinsViewCache coins_view_cache{&backend_coins_view, /*deterministic=*/true};
COutPoint random_out_point;
Coin random_coin;
CMutableTransaction random_mutable_transaction;
LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000) {
CallOneOf(
fuzzed_data_provider,
[&] {
if (random_coin.IsSpent()) {
return;
}
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);
},
[&] {
(void)coins_view_cache.Flush();
},
[&] {
(void)coins_view_cache.Sync();
},
[&] {
coins_view_cache.SetBestBlock(ConsumeUInt256(fuzzed_data_provider));
},
[&] {
Coin move_to;
(void)coins_view_cache.SpendCoin(random_out_point, fuzzed_data_provider.ConsumeBool() ? &move_to : nullptr);
},
[&] {
coins_view_cache.Uncache(random_out_point);
},
[&] {
if (fuzzed_data_provider.ConsumeBool()) {
backend_coins_view = CCoinsView{};
}
coins_view_cache.SetBackend(backend_coins_view);
},
[&] {
const std::optional<COutPoint> opt_out_point = ConsumeDeserializable<COutPoint>(fuzzed_data_provider);
if (!opt_out_point) {
return;
}
random_out_point = *opt_out_point;
},
[&] {
const std::optional<Coin> opt_coin = ConsumeDeserializable<Coin>(fuzzed_data_provider);
if (!opt_coin) {
return;
}
random_coin = *opt_coin;
},
[&] {
const std::optional<CMutableTransaction> opt_mutable_transaction = ConsumeDeserializable<CMutableTransaction>(fuzzed_data_provider);
if (!opt_mutable_transaction) {
return;
}
random_mutable_transaction = *opt_mutable_transaction;
},
[&] {
CCoinsMapMemoryResource resource;
CCoinsMap coins_map{0, SaltedOutpointHasher{/*deterministic=*/true}, CCoinsMap::key_equal{}, &resource};
LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000) {
CCoinsCacheEntry coins_cache_entry;
coins_cache_entry.flags = fuzzed_data_provider.ConsumeIntegral<unsigned char>();
if (fuzzed_data_provider.ConsumeBool()) {
coins_cache_entry.coin = random_coin;
} else {
const std::optional<Coin> opt_coin = ConsumeDeserializable<Coin>(fuzzed_data_provider);
if (!opt_coin) {
return;
}
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);
});
}
{
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});
}
{
std::unique_ptr<CCoinsViewCursor> coins_view_cursor = backend_coins_view.Cursor();
assert(!coins_view_cursor);
(void)backend_coins_view.EstimateSize();
(void)backend_coins_view.GetBestBlock();
(void)backend_coins_view.GetHeadBlocks();
}
if (fuzzed_data_provider.ConsumeBool()) {
CallOneOf(
fuzzed_data_provider,
[&] {
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.
return;
}
bool expected_code_path = false;
const int height{int(fuzzed_data_provider.ConsumeIntegral<uint32_t>() >> 1)};
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);
},
[&] {
(void)AreInputsStandard(CTransaction{random_mutable_transaction}, coins_view_cache);
},
[&] {
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.
return;
}
TxValidationState dummy;
if (!CheckTransaction(transaction, dummy)) {
// It is not allowed to call CheckTxInputs if CheckTransaction failed
return;
}
if (Consensus::CheckTxInputs(transaction, state, coins_view_cache, fuzzed_data_provider.ConsumeIntegralInRange<int>(0, std::numeric_limits<int>::max()), tx_fee_out)) {
assert(MoneyRange(tx_fee_out));
}
},
[&] {
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.
return;
}
(void)GetP2SHSigOpCount(transaction, coins_view_cache);
},
[&] {
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.
return;
}
const auto flags{fuzzed_data_provider.ConsumeIntegral<uint32_t>()};
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.
return;
}
(void)GetTransactionSigOpCost(transaction, coins_view_cache, flags);
},
[&] {
(void)IsWitnessStandard(CTransaction{random_mutable_transaction}, coins_view_cache);
});
}
}