test(protocol): vendor and CI-execute decode-bounds.json vectors (LAB-2737) - #121
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Included review availability: 0 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 1 review per hour. WalkthroughThe change adds MessagePack decode-bound fixtures and tests for serializer, interop, and invalidation-event decoding. Repository rules prevent byte normalisation and formatting changes for protocol fixtures. ChangesDecode-bound protocol coverage
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Inline comments:
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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…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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…-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.
…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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Mutation testing showed the suite was weaker than it read. Three bound constants could be widened with all 47 tests still green: DEFAULT_MAX_DEPTH 100 -> 2000, MAX_INVALIDATION_EVENT_DEPTH 3 -> 2047, and DEFAULT_MAX_INVALIDATION_EVENT_SIZE 4096 -> 10 MB. rules.depth caps the bound at 1024, but every depth-tagged vector nests >= 1100, so no vector can reach the ceiling; assert the constants directly instead. The blanket "any pre-scan message" regex was the other hole. Of the four depth-tagged vectors only nested_fixarray_depth_2048_complete violates depth alone -- the rest also over-claim, so the structural walk catches them as truncated and the regex stayed green. Deleting the depth throw failed only 4 of 47; naming the expected guard per vector takes that to 10 of 49. The accept-vector event case asserted nothing when decode succeeded: it ran inside a bare try and only asserted in catch, so it would have stayed green against a gutted deserializeEvent. Assert the inert all-undefined event it actually returns (no shape check yet, LAB-3477). Byte-stability: the -text attribute used a single-segment glob that stops at the fixtures dir itself, and end-of-file-fixer had no exclude at all while trailing-whitespace skipped only markdown. Today's fixture already ends 0a with no trailing whitespace so nothing was mutated, but an upstream file without a trailing newline would be rewritten at commit time -- and the header tells the next maintainer to re-pin against those mutated bytes.
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Inline comments:
In `@packages/cachekit/test/protocol/decode-bounds.protocol.test.ts`:
- Around line 178-180: Update the reject-vector classification checks around
reject_reasons to require at least one reason for every rejected vector and
reject any unrecognized reason. Preserve the existing depth and overclaim
validations, but dispatch them explicitly and fail with the vector name when
metadata is missing or unknown.
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…AB-2737) A reject vector with a missing or misspelt reject_reasons entry used to pass the fixture-classification test silently: the loop iterated an empty list and ignored any tag it did not recognise, so a re-vendor that swapped in an unclassified vector kept the suite green while pinning nothing. Every reject vector must now carry at least one reason and every reason must be one the test knows how to verify.
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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.
Summary
This PR vendors the upstream
decode-bounds.jsonprotocol test vectors fromcachekit-io/protocoland wires them into CI so that the TypeScript package's MessagePack decode boundaries are validated against the shared cross-language conformance suite (LAB-2737).What Changed
New protocol conformance test (
decode-bounds.protocol.test.ts)decode-bounds.jsonvectors (13 reject vectors, 2 accept vectors) against every untrusted MessagePack decode entry point in the package:MessagePackSerializer.decode(auto-mode serializer)decodeInteropValue(interop/v1 value decoder)deserializeEvent(invalidation-event decoder)FIXTURE_SHA256hash, failing the test if the file drifts from the pinned protocol version.constructionfields reproduce itsinput_hex, confirming the vectors were vendored intact.assertDecodeDepth, LAB-2487) prevents memory-amplification attacks rather than merely erroring out after allocating.MAX_INVALIDATION_EVENT_DEPTH) always fails closed with aSerializationErrorrather than crashing.Fixture integrity guards
.gitattributes: marks the vendored fixtures directory as binary (-text) to prevent CRLF rewriting, keeping bytes identical across platforms so the sha256 pin holds..prettierignore: excludes the fixtures directory from prettier so vendored files stay byte-identical to upstream.Why
These changes ensure the TypeScript decode paths enforce the same decode-bounds guarantees defined in the shared protocol spec (
interop-mode.md#decode-bounds), catching any regression that would weaken protection against maliciously nested MessagePack input. The sha256 pin plus byte-preservation guards make re-vendoring an explicit, auditable step.Note: The
ByteStorageenvelope decode happens in Rust (cachekit-core) and is verified there separately (LAB-3479), not in this test.Summary
This PR strengthens the protocol decode-bounds test suite that validates untrusted MessagePack decoding against vendored
decode-bounds.jsonvectors fromcachekit-io/protocol.Key Changes
Per-vector, exact guard assertions (replacing broad regex matching)
/(decode pre-scan)$/). NowexpectedRejection()computes the exact error each vector must produce at each site — a size-cap error, a depth-exceeded error, or a truncation error — based on the vector's actual size and nesting depth.New guardrail tests
rules.depthconstraints and remain least-privilege (e.g.,MAX_INVALIDATION_EVENT_DEPTHpinned to3,DEFAULT_MAX_INVALIDATION_EVENT_SIZEto4096).depth,overclaim), plus a check ensuring at least one depth-only vector remains so the depth bound stays meaningfully pinned after any re-vendor.Tightened accept-vector event behavior
deserializeEventaccept-vector test now asserts precise outcomes: deep vectors must throw the exact expected rejection, while shallow ones must return an inert all-undefinedevent (reflecting thatdeserializeEventhas no shape check today, tracked as LAB-3477), rather than tolerating either throw-or-decode.Fixture integrity / vendoring hardening
.gitattributesglob (fixtures/**) and added pre-commit excludes fortrailing-whitespaceandend-of-file-fixerso byte-pinned vendored fixtures are never mutated (which would corrupt the sha256 pin).cachekit-pyand list all four coupled edits required when re-vendoring.Summary
Strengthens validation in the
decode-boundsprotocol vector test suite (packages/cachekit/test/protocol/decode-bounds.protocol.test.ts).Changes
reject_reasonsentry. Previously, a vector with an empty or absent list would pass the assertion loop vacuously, silently bypassing rule verification.ifchecks was replaced with aswitchthat throws on any reason other thandepthoroverclaim. Previously, an unrecognized or misspelled tag was ignored, allowing a vector to be accepted without any of its constraints being checked.Impact
Test-only change; no public API or runtime behavior is affected. The suite now fails if vendored
decode-bounds.jsonvectors are untagged or carry reason tags the test does not know how to verify, preventing coverage gaps from going undetected as the vector set evolves.Summary by CodeRabbit
Bug Fixes
Tests