Line data Source code
1 : // Copyright (c) 2020-2022 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 <chainparams.h>
6 : #include <coins.h>
7 : #include <consensus/amount.h>
8 : #include <consensus/tx_check.h>
9 : #include <consensus/tx_verify.h>
10 : #include <consensus/validation.h>
11 : #include <key.h>
12 : #include <policy/policy.h>
13 : #include <primitives/transaction.h>
14 : #include <pubkey.h>
15 : #include <test/fuzz/FuzzedDataProvider.h>
16 : #include <test/fuzz/fuzz.h>
17 2 : #include <test/fuzz/util.h>
18 2 : #include <test/util/setup_common.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 TestingSetup* g_setup;
29 2 : const Coin EMPTY_COIN{};
30 :
31 0 : bool operator==(const Coin& a, const Coin& b)
32 : {
33 0 : if (a.IsSpent() && b.IsSpent()) return true;
34 0 : return a.fCoinBase == b.fCoinBase && a.nHeight == b.nHeight && a.out == b.out;
35 0 : }
36 : } // namespace
37 :
38 0 : void initialize_coins_view()
39 : {
40 0 : static const auto testing_setup = MakeNoLogFileContext<const TestingSetup>();
41 0 : g_setup = testing_setup.get();
42 0 : }
43 :
44 4 : FUZZ_TARGET(coins_view, .init = initialize_coins_view)
45 : {
46 0 : FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
47 0 : CCoinsView backend_coins_view;
48 0 : CCoinsViewCache coins_view_cache{&backend_coins_view, /*deterministic=*/true};
49 0 : COutPoint random_out_point;
50 0 : Coin random_coin;
51 0 : CMutableTransaction random_mutable_transaction;
52 0 : LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000) {
53 0 : CallOneOf(
54 : fuzzed_data_provider,
55 0 : [&] {
56 0 : if (random_coin.IsSpent()) {
57 0 : return;
58 : }
59 0 : Coin coin = random_coin;
60 0 : bool expected_code_path = false;
61 0 : const bool possible_overwrite = fuzzed_data_provider.ConsumeBool();
62 : try {
63 0 : coins_view_cache.AddCoin(random_out_point, std::move(coin), possible_overwrite);
64 0 : expected_code_path = true;
65 0 : } catch (const std::logic_error& e) {
66 0 : if (e.what() == std::string{"Attempted to overwrite an unspent coin (when possible_overwrite is false)"}) {
67 0 : assert(!possible_overwrite);
68 0 : expected_code_path = true;
69 0 : }
70 0 : }
71 0 : assert(expected_code_path);
72 0 : },
73 0 : [&] {
74 2 : (void)coins_view_cache.Flush();
75 0 : },
76 0 : [&] {
77 0 : (void)coins_view_cache.Sync();
78 0 : },
79 0 : [&] {
80 0 : coins_view_cache.SetBestBlock(ConsumeUInt256(fuzzed_data_provider));
81 0 : },
82 0 : [&] {
83 0 : Coin move_to;
84 0 : (void)coins_view_cache.SpendCoin(random_out_point, fuzzed_data_provider.ConsumeBool() ? &move_to : nullptr);
85 0 : },
86 0 : [&] {
87 0 : coins_view_cache.Uncache(random_out_point);
88 0 : },
89 0 : [&] {
90 0 : if (fuzzed_data_provider.ConsumeBool()) {
91 0 : backend_coins_view = CCoinsView{};
92 0 : }
93 0 : coins_view_cache.SetBackend(backend_coins_view);
94 0 : },
95 0 : [&] {
96 0 : const std::optional<COutPoint> opt_out_point = ConsumeDeserializable<COutPoint>(fuzzed_data_provider);
97 0 : if (!opt_out_point) {
98 0 : return;
99 : }
100 0 : random_out_point = *opt_out_point;
101 0 : },
102 0 : [&] {
103 0 : const std::optional<Coin> opt_coin = ConsumeDeserializable<Coin>(fuzzed_data_provider);
104 0 : if (!opt_coin) {
105 0 : return;
106 : }
107 0 : random_coin = *opt_coin;
108 0 : },
109 0 : [&] {
110 0 : const std::optional<CMutableTransaction> opt_mutable_transaction = ConsumeDeserializable<CMutableTransaction>(fuzzed_data_provider);
111 0 : if (!opt_mutable_transaction) {
112 0 : return;
113 : }
114 0 : random_mutable_transaction = *opt_mutable_transaction;
115 0 : },
116 0 : [&] {
117 0 : CCoinsMapMemoryResource resource;
118 0 : CCoinsMap coins_map{0, SaltedOutpointHasher{/*deterministic=*/true}, CCoinsMap::key_equal{}, &resource};
119 0 : LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000) {
120 0 : CCoinsCacheEntry coins_cache_entry;
121 0 : coins_cache_entry.flags = fuzzed_data_provider.ConsumeIntegral<unsigned char>();
122 0 : if (fuzzed_data_provider.ConsumeBool()) {
123 0 : coins_cache_entry.coin = random_coin;
124 0 : } else {
125 0 : const std::optional<Coin> opt_coin = ConsumeDeserializable<Coin>(fuzzed_data_provider);
126 0 : if (!opt_coin) {
127 0 : return;
128 : }
129 0 : coins_cache_entry.coin = *opt_coin;
130 0 : }
131 0 : coins_map.emplace(random_out_point, std::move(coins_cache_entry));
132 0 : }
133 0 : bool expected_code_path = false;
134 : try {
135 0 : coins_view_cache.BatchWrite(coins_map, fuzzed_data_provider.ConsumeBool() ? ConsumeUInt256(fuzzed_data_provider) : coins_view_cache.GetBestBlock());
136 0 : expected_code_path = true;
137 0 : } catch (const std::logic_error& e) {
138 0 : if (e.what() == std::string{"FRESH flag misapplied to coin that exists in parent cache"}) {
139 0 : expected_code_path = true;
140 0 : }
141 0 : }
142 0 : assert(expected_code_path);
143 0 : });
144 0 : }
145 :
146 : {
147 0 : const Coin& coin_using_access_coin = coins_view_cache.AccessCoin(random_out_point);
148 0 : const bool exists_using_access_coin = !(coin_using_access_coin == EMPTY_COIN);
149 0 : const bool exists_using_have_coin = coins_view_cache.HaveCoin(random_out_point);
150 0 : const bool exists_using_have_coin_in_cache = coins_view_cache.HaveCoinInCache(random_out_point);
151 0 : Coin coin_using_get_coin;
152 0 : const bool exists_using_get_coin = coins_view_cache.GetCoin(random_out_point, coin_using_get_coin);
153 0 : if (exists_using_get_coin) {
154 0 : assert(coin_using_get_coin == coin_using_access_coin);
155 0 : }
156 0 : assert((exists_using_access_coin && exists_using_have_coin_in_cache && exists_using_have_coin && exists_using_get_coin) ||
157 : (!exists_using_access_coin && !exists_using_have_coin_in_cache && !exists_using_have_coin && !exists_using_get_coin));
158 : // If HaveCoin on the backend is true, it must also be on the cache if the coin wasn't spent.
159 0 : const bool exists_using_have_coin_in_backend = backend_coins_view.HaveCoin(random_out_point);
160 0 : if (!coin_using_access_coin.IsSpent() && exists_using_have_coin_in_backend) {
161 0 : assert(exists_using_have_coin);
162 0 : }
163 0 : Coin coin_using_backend_get_coin;
164 0 : if (backend_coins_view.GetCoin(random_out_point, coin_using_backend_get_coin)) {
165 0 : assert(exists_using_have_coin_in_backend);
166 : // Note we can't assert that `coin_using_get_coin == coin_using_backend_get_coin` because the coin in
167 : // the cache may have been modified but not yet flushed.
168 0 : } else {
169 0 : assert(!exists_using_have_coin_in_backend);
170 : }
171 0 : }
172 :
173 : {
174 0 : bool expected_code_path = false;
175 : try {
176 0 : (void)coins_view_cache.Cursor();
177 0 : } catch (const std::logic_error&) {
178 0 : expected_code_path = true;
179 0 : }
180 0 : assert(expected_code_path);
181 0 : (void)coins_view_cache.DynamicMemoryUsage();
182 0 : (void)coins_view_cache.EstimateSize();
183 0 : (void)coins_view_cache.GetBestBlock();
184 0 : (void)coins_view_cache.GetCacheSize();
185 0 : (void)coins_view_cache.GetHeadBlocks();
186 0 : (void)coins_view_cache.HaveInputs(CTransaction{random_mutable_transaction});
187 : }
188 :
189 : {
190 0 : std::unique_ptr<CCoinsViewCursor> coins_view_cursor = backend_coins_view.Cursor();
191 0 : assert(!coins_view_cursor);
192 0 : (void)backend_coins_view.EstimateSize();
193 0 : (void)backend_coins_view.GetBestBlock();
194 0 : (void)backend_coins_view.GetHeadBlocks();
195 0 : }
196 :
197 0 : if (fuzzed_data_provider.ConsumeBool()) {
198 0 : CallOneOf(
199 : fuzzed_data_provider,
200 0 : [&] {
201 0 : const CTransaction transaction{random_mutable_transaction};
202 0 : bool is_spent = false;
203 0 : for (const CTxOut& tx_out : transaction.vout) {
204 0 : if (Coin{tx_out, 0, transaction.IsCoinBase()}.IsSpent()) {
205 0 : is_spent = true;
206 0 : }
207 : }
208 0 : if (is_spent) {
209 : // Avoid:
210 : // coins.cpp:69: void CCoinsViewCache::AddCoin(const COutPoint &, Coin &&, bool): Assertion `!coin.IsSpent()' failed.
211 0 : return;
212 : }
213 0 : bool expected_code_path = false;
214 0 : const int height{int(fuzzed_data_provider.ConsumeIntegral<uint32_t>() >> 1)};
215 0 : const bool possible_overwrite = fuzzed_data_provider.ConsumeBool();
216 : try {
217 0 : AddCoins(coins_view_cache, transaction, height, possible_overwrite);
218 0 : expected_code_path = true;
219 0 : } catch (const std::logic_error& e) {
220 0 : if (e.what() == std::string{"Attempted to overwrite an unspent coin (when possible_overwrite is false)"}) {
221 0 : assert(!possible_overwrite);
222 0 : expected_code_path = true;
223 0 : }
224 0 : }
225 0 : assert(expected_code_path);
226 0 : },
227 0 : [&] {
228 0 : (void)AreInputsStandard(CTransaction{random_mutable_transaction}, coins_view_cache);
229 0 : },
230 0 : [&] {
231 0 : TxValidationState state;
232 : CAmount tx_fee_out;
233 0 : const CTransaction transaction{random_mutable_transaction};
234 0 : if (ContainsSpentInput(transaction, coins_view_cache)) {
235 : // Avoid:
236 : // consensus/tx_verify.cpp:171: bool Consensus::CheckTxInputs(const CTransaction &, TxValidationState &, const CCoinsViewCache &, int, CAmount &): Assertion `!coin.IsSpent()' failed.
237 0 : return;
238 : }
239 0 : TxValidationState dummy;
240 0 : if (!CheckTransaction(transaction, dummy)) {
241 : // It is not allowed to call CheckTxInputs if CheckTransaction failed
242 0 : return;
243 : }
244 0 : if (Consensus::CheckTxInputs(transaction, state, coins_view_cache, fuzzed_data_provider.ConsumeIntegralInRange<int>(0, std::numeric_limits<int>::max()), tx_fee_out)) {
245 0 : assert(MoneyRange(tx_fee_out));
246 0 : }
247 0 : },
248 0 : [&] {
249 0 : const CTransaction transaction{random_mutable_transaction};
250 0 : if (ContainsSpentInput(transaction, coins_view_cache)) {
251 : // Avoid:
252 : // consensus/tx_verify.cpp:130: unsigned int GetP2SHSigOpCount(const CTransaction &, const CCoinsViewCache &): Assertion `!coin.IsSpent()' failed.
253 0 : return;
254 : }
255 0 : (void)GetP2SHSigOpCount(transaction, coins_view_cache);
256 0 : },
257 0 : [&] {
258 0 : const CTransaction transaction{random_mutable_transaction};
259 0 : if (ContainsSpentInput(transaction, coins_view_cache)) {
260 : // Avoid:
261 : // consensus/tx_verify.cpp:130: unsigned int GetP2SHSigOpCount(const CTransaction &, const CCoinsViewCache &): Assertion `!coin.IsSpent()' failed.
262 0 : return;
263 : }
264 0 : const auto flags{fuzzed_data_provider.ConsumeIntegral<uint32_t>()};
265 0 : if (!transaction.vin.empty() && (flags & SCRIPT_VERIFY_WITNESS) != 0 && (flags & SCRIPT_VERIFY_P2SH) == 0) {
266 : // Avoid:
267 : // script/interpreter.cpp:1705: size_t CountWitnessSigOps(const CScript &, const CScript &, const CScriptWitness *, unsigned int): Assertion `(flags & SCRIPT_VERIFY_P2SH) != 0' failed.
268 0 : return;
269 : }
270 0 : (void)GetTransactionSigOpCost(transaction, coins_view_cache, flags);
271 0 : },
272 0 : [&] {
273 0 : (void)IsWitnessStandard(CTransaction{random_mutable_transaction}, coins_view_cache);
274 0 : });
275 0 : }
276 0 : }
|
