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Merge bitcoin/bitcoin#32638: blocks: force hash validations on disk read

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9341b5333a blockstorage: make block read hash checks explicit (Lőrinc)
2371b9f4ee test/bench: verify hash in `ComputeFilter` reads (Lőrinc)
5d235d50d6 net: assert block hash in `ProcessGetBlockData` and `ProcessMessage` (Lőrinc)

Pull request description:

  A follow-up to https://github.com/bitcoin/bitcoin/pull/32487#discussion_r2094072165, after which validating the hash of a read block from disk doesn't incur the cost of calculating its hash anymore.

  ### Summary

  This PR adds explicit checks that the read block header's hash matches the one we were expecting.

  ### Context

  After the previous PR, validating a block's hash during read operations became essentially free. This PR leverages that by requiring callers to provide a block's expected hash (or `std::nullopt`), preventing silent failures caused by corrupted or mismatched data. Most `ReadBlock` usages were updated with expected hashes and now fail on mismatch.

  ### Changes

  * added hash assertions in `ProcessGetBlockData` and `ProcessMessage` to validate that the block read from disk matches the expected hash;
  * updated tests and benchmark to pass the correct block hash to `ReadBlock()`, ensuring the hash validation is tested - or none if we already expect PoW failure;
  * removed the default value for `expected_hash`, requiring an explicit hash for all block reads.

  ### Why is the hash still optional (but no longer has a default value)

  * for header-error tests, where the goal is to trigger failures early in the parsing process;
  * for out-of-order orphan blocks, where the child hash isn't available before the initial disk read.

ACKs for top commit:
  maflcko:
    review ACK 9341b5333a 🕙
  achow101:
    ACK 9341b5333a
  hodlinator:
    ACK 9341b5333a
  janb84:
    re ACK 9341b5333a

Tree-SHA512: cf1d4fff4c15e3f8898ec284929cb83d7e747125d4ee759e77d369f1716728e843ef98030be32c8d608956a96ae2fbefa0e801200c333b9eefd6c086ec032e1f
This commit is contained in:
Ava Chow
2025-06-27 13:28:26 -07:00
parent 689318ccd9 9341b5333a
commit 319ff58bbd
6 changed files with 18 additions and 16 deletions
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8
src/validation.cpp
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@@ -5204,14 +5204,14 @@ void ChainstateManager::LoadExternalBlockFile(
while (range.first != range.second) {
std::multimap<uint256, FlatFilePos>::iterator it = range.first;
std::shared_ptr<CBlock> pblockrecursive = std::make_shared<CBlock>();
if (m_blockman.ReadBlock(*pblockrecursive, it->second)) {
LogDebug(BCLog::REINDEX, "%s: Processing out of order child %s of %s\n", __func__, pblockrecursive->GetHash().ToString(),
head.ToString());
if (m_blockman.ReadBlock(*pblockrecursive, it->second, {})) {
const auto& block_hash{pblockrecursive->GetHash()};
LogDebug(BCLog::REINDEX, "%s: Processing out of order child %s of %s", __func__, block_hash.ToString(), head.ToString());
LOCK(cs_main);
BlockValidationState dummy;
if (AcceptBlock(pblockrecursive, dummy, nullptr, true, &it->second, nullptr, true)) {
nLoaded++;
queue.push_back(pblockrecursive->GetHash());
queue.push_back(block_hash);
}
}
range.first++;