test(protocol): vendor and CI-execute decode-bounds.json vectors (LAB-2737) - #121
test(protocol): vendor and CI-execute decode-bounds.json vectors (LAB-2737)#12127Bslash6 wants to merge 2 commits into
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…-2737) Vendor cachekit-io/protocol test-vectors/decode-bounds.json (protocol#59 @ b75adac4: 13 reject + 2 accept, sha256 75c1204e…) and run every vector against all three untrusted MessagePack decode sites — MessagePackSerializer .decode, decodeInteropValue, deserializeEvent — under the default vitest run. Reject vectors must throw SerializationError *from the pre-scan* at every site: the class alone is a false green, because without assertDecodeDepth the decoder still throws at EOF (wrapped) after allocating ~33 MB for the nested_array16_depth_2048 vector — the LAB-2487 amplification this gate exists to catch. Accept vectors must decode on the value paths; on the event path (depth cap MAX_INVALIDATION_EVENT_DEPTH) a deeper accept vector must be rejected with SerializationError only, a shallower one may decode or be rejected, again only with SerializationError. The fixture is sha256- and count-pinned so a silent edit fails; the fixtures dir is prettier-ignored and marked -text so neither the hook nor a CRLF checkout can break byte-identity with upstream.
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WalkthroughThe change adds decode-bound protocol vectors and tests. It also prevents text normalisation and formatting changes for vendored protocol fixtures. ChangesDecode-bound protocol coverage
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Other Merge Risk: 🔵 Low · up to The added suite could accept an implementation that exceeds the protocol depth limit, so the boundary vector should be corrected before merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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In `@packages/cachekit/test/protocol/decode-bounds.protocol.test.ts`:
- Around line 109-114: Update the accept-vector tests for
MessagePackSerializer.decode and decodeInteropValue to assert decoded values,
not only that decoding does not throw. Add expectations for
nested_fixarray_depth_32 to produce a 32-level nested array ending in null and
for array16_256_backed_nils to produce an array of 256 null elements, covering
both decoder paths.
- Around line 133-137: Update deserializeEvent to validate the decoded payload’s
required CompactEvent shape before casting or returning an InvalidationEvent,
throwing SerializationError for malformed values such as
array16_256_backed_nils. Adjust the tests so the generic vector remains a bounds
test while separately asserting malformed event rejection and checking the
returned event rather than ignoring it.
In `@packages/cachekit/test/protocol/fixtures/decode-bounds.json`:
- Line 74: Update the depth-only reject vector in the decode-bounds fixtures to
use repeat_hex "91", count 1025, and suffix_hex "c0", creating a structurally
complete depth-1025 document. Regenerate the pinned fixture hash and increment
the reject-vector count accordingly.
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.gitattributes.prettierignorepackages/cachekit/test/protocol/decode-bounds.protocol.test.tspackages/cachekit/test/protocol/fixtures/decode-bounds.json
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…at they decode (LAB-2737) CodeRabbit on #121: a truncated or wrong decode of nested_fixarray_depth_32 / array16_256_backed_nils passed the value-path tests because their results were discarded. Pin the expected values (32-deep [[...[null]...]], 256 nils) for MessagePackSerializer.decode and decodeInteropValue, and tie the table to the fixture's accept-vector names so a re-vendored vector cannot slip past unasserted.
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Summary
This PR vendors the
decode-bounds.jsonprotocol test vectors fromcachekit-io/protocoland wires them into the CI test suite to enforce MessagePack decode-bounds safety guarantees across all untrusted decode entry points (LAB-2737).What Changed
New protocol test suite (
decode-bounds.protocol.test.ts):MessagePackSerializer.decode(auto-mode serializer)decodeInteropValue(interop/v1 value decoder)deserializeEvent(invalidation-event decoder)FIXTURE_SHA256) and asserts the expected vector counts (13 reject, 2 accept), so any drift from the upstream protocol revision fails loudly.repeat_hex * count + suffix_hexconstruction reproduces itsinput_hex.SerializationErrorbefore any allocation, matching the message from the decode pre-scan (assertDecodeDepth, LAB-2487) — proving the rejection happens at the pre-scan rather than later during decode.deserializeEventfails closed (never aborts) when a vector nests deeper thanMAX_INVALIDATION_EVENT_DEPTH.Byte-integrity safeguards for vendored fixtures:
.gitattributes: marks the fixtures directory as binary (-text) to prevent CRLF rewrites undercore.autocrlf, keeping bytes identical across platforms for sha256 pinning..prettierignore: excludes the fixtures directory so Prettier never reformats the vendored files.Why
These changes ensure the TypeScript decoders correctly enforce the shared protocol's decode-bounds specification (
spec/interop-mode.md#decode-bounds), guarding against a MessagePack nesting/allocation-amplification vulnerability. Vendoring the vectors with strict byte-pinning keeps the TS implementation verifiably in sync with the upstream protocol, while the ByteStorage envelope decode is verified separately in Rust (LAB-3479).Notes
The file comments document the re-vendoring process: copy
test-vectors/decode-bounds.jsonbyte-for-byte from protocol main, then updateFIXTURE_SHA256and the vector counts in the first test.Summary
This PR strengthens the test assertions for
decode-bounds.jsonprotocol vectors by verifying decoded values rather than merely confirming that decoding does not throw.Changes
Added an
EXPECTEDvalue map that pins each accept vector to the exact value it should decode to:nested_fixarray_depth_32: a 32-level deeply nested arrayarray16_256_backed_nils: an array of 256nullvaluesUpgraded accept-vector assertions in both the
MessagePackSerializer.decodeanddecodeInteropValuetest paths. Previously these only checked that decoding did not throw (not.toThrow()); they now assert the decoded output deep-equals the pinned expected value (toEqual(EXPECTED[v.name])).Added a coverage guard in the manifest test that asserts the accept vector names match the keys in
EXPECTED. This ensures that any newly vendored accept vector must have a corresponding expected value defined, or the test will fail.Purpose
These changes prevent a "false green" scenario where the decoder throws or produces incorrect output but the test still passes because it only checked for the absence of an exception. By pinning expected values and enforcing that every accept vector is accounted for, the tests now validate correctness of decode behavior and stay in sync when vectors are re-vendored.