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1 : : // Copyright (c) 2023 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 <chain.h>
6 : : #include <chainparams.h>
7 : : #include <node/blockstorage.h>
8 : : #include <test/fuzz/FuzzedDataProvider.h>
9 : : #include <test/fuzz/fuzz.h>
10 : : #include <test/fuzz/util.h>
11 : : #include <test/util/setup_common.h>
12 : : #include <txdb.h>
13 : : #include <validation.h>
14 : :
15 : : using kernel::CBlockFileInfo;
16 : :
17 : : namespace {
18 : :
19 : : const BasicTestingSetup* g_setup;
20 : :
21 : : // Hardcoded block hash and nBits to make sure the blocks we store pass the pow check.
22 : : uint256 g_block_hash;
23 : :
24 : 17260 : bool operator==(const CBlockFileInfo& a, const CBlockFileInfo& b)
25 : : {
26 : 34520 : return a.nBlocks == b.nBlocks &&
27 [ + - ]: 17260 : a.nSize == b.nSize &&
28 [ + - ]: 17260 : a.nUndoSize == b.nUndoSize &&
29 [ + - ]: 17260 : a.nHeightFirst == b.nHeightFirst &&
30 [ + - ]: 17260 : a.nHeightLast == b.nHeightLast &&
31 [ + - + - ]: 34520 : a.nTimeFirst == b.nTimeFirst &&
32 [ - + ]: 17260 : a.nTimeLast == b.nTimeLast;
33 : : }
34 : :
35 : 1393219 : CBlockHeader ConsumeBlockHeader(FuzzedDataProvider& provider)
36 : : {
37 : 1393219 : CBlockHeader header;
38 : 1393219 : header.nVersion = provider.ConsumeIntegral<decltype(header.nVersion)>();
39 : 1393219 : header.hashPrevBlock = g_block_hash;
40 : 1393219 : header.hashMerkleRoot = g_block_hash;
41 : 1393219 : header.nTime = provider.ConsumeIntegral<decltype(header.nTime)>();
42 : 1393219 : header.nBits = Params().GenesisBlock().nBits;
43 : 1393219 : header.nNonce = provider.ConsumeIntegral<decltype(header.nNonce)>();
44 : 1393219 : return header;
45 : : }
46 : :
47 : : } // namespace
48 : :
49 : 1 : void init_block_index()
50 : : {
51 [ + - + - : 1 : static const auto testing_setup = MakeNoLogFileContext<>(ChainType::MAIN);
+ - ]
52 : 1 : g_setup = testing_setup.get();
53 : 1 : g_block_hash = Params().GenesisBlock().GetHash();
54 : 1 : }
55 : :
56 [ + - ]: 938 : FUZZ_TARGET(block_index, .init = init_block_index)
57 : : {
58 : 480 : FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
59 [ + - ]: 480 : auto block_index = kernel::BlockTreeDB(DBParams{
60 : : .path = "", // Memory only.
61 : : .cache_bytes = 1 << 20, // 1MB.
62 : : .memory_only = true,
63 : 480 : });
64 : :
65 : : // Generate a number of block files to be stored in the index.
66 : 480 : int files_count = fuzzed_data_provider.ConsumeIntegralInRange(1, 100);
67 : 480 : std::vector<std::unique_ptr<CBlockFileInfo>> files;
68 [ + - ]: 480 : files.reserve(files_count);
69 : 480 : std::vector<std::pair<int, const CBlockFileInfo*>> files_info;
70 [ + - ]: 480 : files_info.reserve(files_count);
71 [ + + ]: 17772 : for (int i = 0; i < files_count; i++) {
72 [ + + ]: 17320 : if (auto file_info = ConsumeDeserializable<CBlockFileInfo>(fuzzed_data_provider)) {
73 [ + - ]: 34584 : files.push_back(std::make_unique<CBlockFileInfo>(std::move(*file_info)));
74 [ + - ]: 17292 : files_info.emplace_back(i, files.back().get());
75 : : } else {
76 : 28 : return;
77 : : }
78 : : }
79 : :
80 : : // Generate a number of block headers to be stored in the index.
81 : 452 : int blocks_count = fuzzed_data_provider.ConsumeIntegralInRange(files_count * 10, files_count * 100);
82 : 452 : std::vector<std::unique_ptr<CBlockIndex>> blocks;
83 [ + - ]: 452 : blocks.reserve(blocks_count);
84 : 452 : std::vector<const CBlockIndex*> blocks_info;
85 [ + - ]: 452 : blocks_info.reserve(blocks_count);
86 [ + + ]: 1393671 : for (int i = 0; i < blocks_count; i++) {
87 [ + - ]: 1393219 : CBlockHeader header{ConsumeBlockHeader(fuzzed_data_provider)};
88 [ + - ]: 2786438 : blocks.push_back(std::make_unique<CBlockIndex>(std::move(header)));
89 [ + - ]: 1393219 : blocks.back()->phashBlock = &g_block_hash;
90 [ + - ]: 1393219 : blocks_info.push_back(blocks.back().get());
91 : : }
92 : :
93 : : // Store these files and blocks in the block index. It should not fail.
94 [ + - ]: 452 : block_index.WriteBatchSync(files_info, files_count - 1, blocks_info);
95 : :
96 : : // We should be able to read every block file info we stored. Its value should correspond to
97 : : // what we stored above.
98 : 452 : CBlockFileInfo info;
99 [ + - + + ]: 17712 : for (const auto& [n, file_info]: files_info) {
100 [ + - - + ]: 17260 : assert(block_index.ReadBlockFileInfo(n, info));
101 [ - + ]: 17260 : assert(info == *file_info);
102 : : }
103 : :
104 : : // We should be able to read the last block file number. Its value should be consistent.
105 : 452 : int last_block_file;
106 [ + - - + ]: 452 : assert(block_index.ReadLastBlockFile(last_block_file));
107 [ - + ]: 452 : assert(last_block_file == files_count - 1);
108 : :
109 : : // We should be able to flip and read the reindexing flag.
110 : 452 : bool reindexing;
111 [ + - ]: 452 : block_index.WriteReindexing(true);
112 [ + - ]: 452 : block_index.ReadReindexing(reindexing);
113 [ - + ]: 452 : assert(reindexing);
114 [ + - ]: 452 : block_index.WriteReindexing(false);
115 [ + - ]: 452 : block_index.ReadReindexing(reindexing);
116 [ - + ]: 452 : assert(!reindexing);
117 : :
118 : : // We should be able to set and read the value of any random flag.
119 [ + - ]: 452 : const std::string flag_name = fuzzed_data_provider.ConsumeRandomLengthString(100);
120 : 452 : bool flag_value;
121 [ + - ]: 452 : block_index.WriteFlag(flag_name, true);
122 [ + - ]: 452 : block_index.ReadFlag(flag_name, flag_value);
123 [ - + ]: 452 : assert(flag_value);
124 [ + - ]: 452 : block_index.WriteFlag(flag_name, false);
125 [ + - ]: 452 : block_index.ReadFlag(flag_name, flag_value);
126 [ - + ]: 452 : assert(!flag_value);
127 : :
128 : : // We should be able to load everything we've previously stored. Note to assert on the
129 : : // return value we need to make sure all blocks pass the pow check.
130 [ + - + - ]: 452 : const auto params{Params().GetConsensus()};
131 : 1356 : const auto inserter = [&](const uint256&) {
132 : 904 : return blocks.back().get();
133 : 452 : };
134 [ + - - + : 1808 : WITH_LOCK(::cs_main, assert(block_index.LoadBlockIndexGuts(params, inserter, g_setup->m_interrupt)));
+ - ]
135 : 480 : }
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