fix(stdlib): zero-pad bufferFromFields when declared length exceeds payload#21802
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spalladino merged 1 commit intomerge-train/spartanfrom Mar 19, 2026
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…ayload If the declared byte length in the first field exceeds the bytes available from the payload fields, the result is now zero-padded to the full declared length. This hardens against a scenario where a contract class log is reconstructed from blobs with a short emittedLength, causing the bytecode buffer to be shorter than declared and bytecode commitment computations to diverge from what the circuit produced. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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…ayload (#21802) Ensures that `bufferFromFields` always returns a buffer with the length requested in the first field of the array. This protects against this method being called with a truncated array, which could cause a wrong public bytecode commitment to be computed. Note that this is currently not the case, since this function always gets called with an array that's exactly `CONTRACT_CLASS_LOG_SIZE_IN_FIELDS` long, which is greater than the `MAX_PACKED_PUBLIC_BYTECODE_SIZE_IN_FIELDS`. Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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✅ Successfully backported to backport-to-v4-next-staging #21819. |
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BEGIN_COMMIT_OVERRIDE feat(p2p): add tx validator for contract instance deployment addresses (#21771) fix: always deploy IRM for testnet (#21755) fix: avoid mutating caller's array via splice in snapshot sync (A-718) (#21759) chore: update network logs skill (#21785) feat(archiver): validate contract instance addresses before storing (#21787) fix: ensure no division by 0 (#21786) feat: support private fork releases via ci-release (#21778) fix: restrict scenario deployments to only nightly (#21798) fix(stdlib): zero-pad bufferFromFields when declared length exceeds payload (#21802) test(protocol-contracts): verify max-size bytecode fits in contract class log (#21818) fix: wire BOT_DA_GAS_LIMIT through helm/terraform for staging-public (#21809) fix: remove jest-mock-extended from worker processes + fix parallelize_strict silent failures (#21821) fix(archiver): throw on duplicate contract class or instance additions (#21799) chore: remove broadcasted function events (#21805) fix: sync dateProvider from anvil stdout on every mined block (#21829) fix(sequencer): use wall-clock time instead of L1 block timestamp for slot estimation (#21769) fix: use correct EthCheatCodes method name in epochs_missed_l1_slot test (#21848) feat(p2p): add tx validator for contract class id verification (#21788) feat: publisher funding (#21631) feat: batch chonk verifier TS integration (#21823) fix(sequencer): remove l1 block timestamp check (#21853) fix: use local IVC inputs for batch_verifier bench test (#21857) fix(p2p): centralize gossipsub penalization and fix inconsistencies (#21863) chore: publish GitHub releases to AztecProtocol/barretenberg (#21775) END_COMMIT_OVERRIDE
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BEGIN_COMMIT_OVERRIDE chore: backport #21754 (feat!: make isContractInitialized a tri-state enum) to v4-next (#21792) fix(stdlib): zero-pad bufferFromFields when declared length exceeds payload (#21802) test(protocol-contracts): verify max-size bytecode fits in contract class log (#21818) chore: port P2P mesh topic deflake fix to v4-next (#21825) fix(archiver): throw on duplicate contract class or instance additions (#21799) feat: sync poseidon in the browser (#21833) chore: backport #21824 (fix(aztec-up): add sensible defaults to installer y/n prompts) to v4-next (#21844) fix(sequencer): backport wall-clock time for slot estimation to v4-next (#21769) (#21847) chore: backport PR #21788 (feat(p2p): add tx validation for contract class id verification) to v4-next (#21852) feat: sync poseidon browser (#21851) END_COMMIT_OVERRIDE
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Ensures that
bufferFromFieldsalways returns a buffer with the length requested in the first field of the array.This protects against this method being called with a truncated array, which could cause a wrong public bytecode commitment to be computed. Note that this is currently not the case, since this function always gets called with an array that's exactly
CONTRACT_CLASS_LOG_SIZE_IN_FIELDSlong, which is greater than theMAX_PACKED_PUBLIC_BYTECODE_SIZE_IN_FIELDS.