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[PR #1472] [CLOSED] fix(json): refuse evidence JSON that cannot decode before reading it #2910
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opened 2026-10-17 21:11:43 +00:00 by bsakaguchi
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📋 Pull Request Information
Original PR: https://github.com/morluto/rea/pull/1472
Author: @DeryFerd
Created: 10/10/2026
Status: ❌ Closed
Base:
main← Head:fix/json-undecodable-input-admission📝 Commits (1)
549b68bfix(json): refuse evidence JSON that cannot decode before reading it📊 Changes
2 files changed (+64 additions, -4 deletions)
View changed files
📝
src/application/JsonFiles.ts(+33 -3)📝
tests/boundary/filesystem/jsonUtf8Input.test.ts(+31 -1)📄 Description
Summary
readJsonFilebacks evidence bundle imports and analysis snapshot loads, and it used to pull the caller-selected file into memory before anything checked whether the file could ever be accepted. This PR adds an admission check on the stat that the file handle already provides: an input larger than three times the runtime string limit cannot decode under any content, so it is refused immediately with the same typedresource_constrainterror the decode path already produces, now carrying the failed bound asmax_decodable_input_bytes. No issue is linked because this is a standalone boundary hardening found while reading the JSON input path, not a report-driven fix.Problem and expected behavior
Smallest trigger: call
readJsonFileon a regular file whose size exceeds3 * constants.MAX_STRING_LENGTH, roughly 1.5 GiB with Node's current ~512 MiB string limit. Prior behavior: the whole file was read into aBufferfirst, and only then didparseUtf8Jsonchunk-decode it and raiseAnalysisResourceConstraintErroronce the decoded length crossed the limit. The violated invariant: a caller should learn that input can never be accepted without the host first paying for every byte of it. On a machine that cannot hold the file, the process can die insidereadFile()and the typed error, with its path, byte count, and remediation, never appears. Expected behavior: refuse from the admission stat, report the observed size and both limits, and never read the file's bytes.Change and scope
The check lives in
readJsonFile(src/application/JsonFiles.ts), which now goes throughwithRegularFileso the size is stat-ed on the same open handle that performs the read; a file that grows after admission still falls back to the existing decode classification, so the refusal can never be the only guard. The bound is3 * constants.MAX_STRING_LENGTHbecause UTF-8's smallest ratio is one UTF-16 code unit per three bytes (three-byte BMP sequences), which means anything larger cannot decode within the runtime string limit no matter its content, and anything smaller cannot be rejected on size alone without refusing inputs that work today, including multibyte-heavy files that pass through the chunked decode. Intentionally not included: the CLI streaming reader (readCliJsonFile) already reads in 64 KiB chunks and needs no admission, no configuration knob is added, and no other read path changes.Contract and boundary impact
readJsonFileinsrc/application/JsonFiles.ts, before UTF-8 decode; domain schemas untouched.resource_constraintprojection, itsdetailsrecord is an open string-to-JSON map, and no tool is added or removed, so the generated catalog does not move.input_bytesfrom the stat plus the derivedmax_decodable_input_bytes, keeping observed and derived values distinguishable, and reuses the existing remediation text for evidence workflows.withRegularFilefinally path.docs/public/product-catalog.json), package, or installation impact (CI generates and validates ignored catalogs andskills/; edit authored instructions inskill-src/and never commit build outputs): none. No contract, catalog, or skill input changed, and no build output is committed.Evidence and regression coverage
tests/boundary/filesystem/jsonUtf8Input.test.tscreates a sparse file of3 * MAX_STRING_LENGTH + 1bytes and asserts the typed refusal withoperation: "read_evidence_file",resource: "memory", observedinput_bytes,max_string_code_units, andmax_decodable_input_bytes.max_decodable_input_bytes; with this change the case finishes in about 50 ms because only the stat is consulted. The new test fails on the base revision for exactly the missing bound.resource_constraintdetails for refused oversized inputs now carrymax_decodable_input_bytesalongside the existing fields; inputs below the bound are unchanged.For evidence-bearing changes:
Validation performed
npx vitest run tests/boundary/filesystem/jsonUtf8Input.test.ts— 3 passed, including the new admission case.npx vitest run tests/boundary/cli/jsonInputSize.test.ts— 3 passed; this suite pins the whole-document string-limit classifications for both readers.npx vitest run tests/boundary/filesystem/evidenceBundleFiles.test.ts tests/boundary/filesystem/cliJsonInput.test.ts— 34 passed, 4 skipped, 2 failed; both failures areEPERMinside the tests' ownsymlink()fixture setup on Windows, before any application read code runs.npm run typecheck— exit 0 on the rebased branch.npx oxlinton the two changed files — 0 warnings, 0 errors;oxfmt --checkon the committed (LF) form — clean.Compatibility, safety, and release
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type(scope): outcome.🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.