2025 10 21 audit #85
2025 10 21 audit #85
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WalkthroughUpdates include numeric gas-snapshot entries, a forge-std submodule bump, replacing direct keccak256 calls with memory-safe inline-assembly hashing in several libraries/contracts, minor import lint suppressions, and small test import/identifier changes. No public signatures were altered. Changes
Sequence Diagram(s)sequenceDiagram
participant Caller
participant MetaBoard as MetaBoard.hash
participant Memory as Memory (mstore)
participant Keccak as keccak256
Caller->>MetaBoard: hash(bytes calldata data)
Note right of MetaBoard: copy calldata -> memory (assembly)
MetaBoard->>Memory: copy calldata into memory
MetaBoard->>Keccak: keccak256(memory_ptr, length)
Keccak-->>MetaBoard: bytes32 hash
MetaBoard-->>Caller: return dataHash
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~20 minutes Possibly related PRs
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Pre-merge checks and finishing touches❌ Failed checks (1 inconclusive)
✅ Passed checks (2 passed)
✨ Finishing touches🧪 Generate unit tests (beta)
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⚠️ Outside diff range comments (1)
src/lib/LibMeta.sol (1)
39-48: Consider validating metadata format before checking hash.The function currently checks the hash (lines 40-46) before validating that
metais valid Rain metadata (line 47). This ordering can produce misleading errors:
- If
metais invalid Rain metadata AND the hash doesn't match, you getUnexpectedMetaHashwithout knowing the metadata is malformed- The hash check should ideally operate on validated metadata
Consider reordering to check metadata validity first:
function checkMetaHashedV1(bytes32 expectedHash, bytes memory meta) internal pure { + checkMetaUnhashedV1(meta); bytes32 actualHash; assembly ("memory-safe") { actualHash := keccak256(add(meta, 0x20), mload(meta)) } if (expectedHash != actualHash) { revert UnexpectedMetaHash(expectedHash, actualHash); } - checkMetaUnhashedV1(meta); }This ensures format validation occurs before hash computation, providing clearer error messages and failing fast on malformed input.
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flake.lockis excluded by!**/*.lockfoundry.lockis excluded by!**/*.lock
📒 Files selected for processing (10)
.gas-snapshot(1 hunks)lib/forge-std(1 hunks)src/concrete/MetaBoard.sol(0 hunks)src/interface/unstable/IMetaV1_2.sol(1 hunks)src/lib/LibDescribedByMeta.sol(1 hunks)src/lib/LibMeta.sol(2 hunks)test/concrete/MetaBoard.hash.t.sol(0 hunks)test/lib/LibDescribedByMeta.emitForDescribedAddress.t.sol(1 hunks)test/lib/LibMeta.checkMetaUnhashedV1_2.t.sol(1 hunks)test/lib/LibMeta.isRainMetaV1_2.t.sol(1 hunks)
💤 Files with no reviewable changes (2)
- src/concrete/MetaBoard.sol
- test/concrete/MetaBoard.hash.t.sol
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🔇 Additional comments (7)
lib/forge-std (1)
1-1: Update PR description to document the forge-std dependency bump.Submodule update to b8f065f has been verified as safe—it adds Unichain and Unichain Sepolia RPC URLs, a low-risk, backwards-compatible change. However, the PR description remains empty. Add a note explaining why this version bump was necessary and its relationship to the refactored assembly-based hash calculations, if applicable.
test/lib/LibMeta.checkMetaUnhashedV1_2.t.sol (1)
7-7: LGTM! Import cleanup aligns with test scope.Removing
UnexpectedMetaHashis appropriate since this test file only validates unhashed metadata format, not hash matching.src/interface/unstable/IMetaV1_2.sol (1)
5-6: LGTM! Re-export pattern supports gradual migration.This imports symbols from the deprecated
IMetaV1.solto re-export them, allowing consumers to import fromIMetaV1_2.solinstead of the deprecated path. The lint suppression is appropriate since the interface itself doesn't use these symbols directly.src/lib/LibDescribedByMeta.sol (1)
16-19: LGTM! Memory-safe assembly pattern is correct.The assembly implementation correctly:
- Skips the 32-byte length prefix with
add(meta, 0x20)- Uses the length from
mload(meta)- Produces the same result as
keccak256(meta)with explicit memory-safety annotation.gas-snapshot (1)
1-9: LGTM! Expected gas snapshot updates.The metrics updates reflect the functional changes in this PR (memory-safe assembly hashing and additional validation checks).
src/lib/LibMeta.sol (2)
5-5: LGTM! Lint suppression for re-exported interface.The unused import suppression is appropriate since
IMetaV1_2is imported alongside the error types and constants, likely for consistency with the import pattern across the codebase.
40-43: LGTM! Memory-safe assembly implementation is correct.The assembly implementation correctly computes the keccak256 hash by:
- Skipping the length prefix with
add(meta, 0x20)- Using the actual byte length from
mload(meta)- Maintaining memory-safety guarantees
This is consistent with the same pattern used in
LibDescribedByMeta.sol.
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.gas-snapshot(1 hunks)src/concrete/MetaBoard.sol(1 hunks)
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🔇 Additional comments (1)
.gas-snapshot (1)
1-10: Gas snapshot updates appear consistent with implementation changes.The updated metrics reflect the new assembly-based hashing implementations. Ensure these measurements were generated after all code changes and that the gas differences align with expectations from the memory-safe assembly approach.
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Bug Fixes
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