1  // Copyright (c) 2020-present 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 <test/fuzz/FuzzedDataProvider.h>
 7  #include <test/fuzz/fuzz.h>
 8  #include <test/fuzz/util.h>
 9  
10  #include <cstdint>
11  #include <optional>
12  #include <vector>
13  
14  FUZZ_TARGET(chain)
15  {
16      FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
17      std::optional<CDiskBlockIndex> disk_block_index = ConsumeDeserializable<CDiskBlockIndex>(fuzzed_data_provider);
18      if (!disk_block_index) {
19          return;
20      }
21  
22      const uint256 zero{};
23      disk_block_index->phashBlock = &zero;
24      {
25          LOCK(::cs_main);
26          (void)disk_block_index->ConstructBlockHash();
27          (void)disk_block_index->GetBlockPos();
28          (void)disk_block_index->GetBlockTime();
29          (void)disk_block_index->GetBlockTimeMax();
30          (void)disk_block_index->GetMedianTimePast();
31          (void)disk_block_index->GetUndoPos();
32          (void)disk_block_index->HaveNumChainTxs();
33          (void)disk_block_index->IsValid(BLOCK_VALID_TRANSACTIONS);
34      }
35  
36      const CBlockHeader block_header = disk_block_index->GetBlockHeader();
37      (void)CDiskBlockIndex{*disk_block_index};
38      (void)disk_block_index->BuildSkip();
39  
40      LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000) {
41          const BlockStatus block_status = fuzzed_data_provider.PickValueInArray({
42              BlockStatus::BLOCK_VALID_UNKNOWN,
43              BlockStatus::BLOCK_VALID_RESERVED,
44              BlockStatus::BLOCK_VALID_TREE,
45              BlockStatus::BLOCK_VALID_TRANSACTIONS,
46              BlockStatus::BLOCK_VALID_CHAIN,
47              BlockStatus::BLOCK_VALID_SCRIPTS,
48              BlockStatus::BLOCK_VALID_MASK,
49              BlockStatus::BLOCK_HAVE_DATA,
50              BlockStatus::BLOCK_HAVE_UNDO,
51              BlockStatus::BLOCK_HAVE_MASK,
52              BlockStatus::BLOCK_FAILED_VALID,
53              BlockStatus::BLOCK_OPT_WITNESS,
54          });
55          if (block_status & ~BLOCK_VALID_MASK) {
56              continue;
57          }
58          WITH_LOCK(::cs_main, (void)disk_block_index->RaiseValidity(block_status));
59      }
60  
61      CBlockIndex block_index{block_header};
62      block_index.phashBlock = &zero;
63      (void)block_index.GetBlockHash();
64      (void)block_index.ToString();
65  }