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📋 Pull Request Information
Original PR: https://github.com/morluto/rea/pull/6254
Author: @kaoru0822-kitauji
Created: 10/22/2026
Status: ✅ Merged
Merged: 10/22/2026
Merged by: @kaoru0822-kitauji
Base:
main← Head:fix/5882-nativeaot-copy-growth📝 Commits (1)
a24e297fix(nativeaot): preserve COPY bytes when hydration output grows📊 Changes
3 files changed (+276 additions, -9 deletions)
View changed files
➕
src/domain/native/nativeAotPe.hydration.test.ts(+149 -0)📝
src/domain/native/nativeAotPe.ts(+11 -9)📝
tests/fixtures/nativeaotPe.ts(+116 -0)📄 Description
What broke: A NativeAOT DEHYDRATED_DATA COPY that grew the hydration buffer wrote its payload into the old buffer. The overlay then hashed uninitialized bytes, and the report still said
status: complete.Fix: Reserving output now returns a view into the buffer that is kept. Every hydration writer (COPY, zero fill, relative/absolute fixups) writes only through that view, so no writer can hold a buffer that growth has replaced.
Risk: Low. The change is local to
hydrateinsrc/domain/native/nativeAotPe.ts. Growth, limits and budget accounting are unchanged, and the microbenchmark showed no measurable cost.Summary
Fixes #5882
The built-in NativeAOT PE parser (
parseNativeAotPe) builds the read-only derived overlay by running the RTR9.1 hydration command stream. Before this change,chunk.copy(output, ensureOutput(chunk.length))readoutputbeforeensureOutputreplaced it with a larger buffer. Any COPY that triggered growth therefore lost its bytes.derived_overlay.size_byteswas still correct, butsha256identified wrong (uninitialized) contents, and there was no diagnostic. With this change the overlay holds the bytes the command stream defines.Problem and expected behavior
Change and scope
ensureOutput(length): numberbecamereserveOutput(length): Buffer. It grows the buffer when needed and returnsoutput.subarray(start, start + length)of the buffer that is kept. All four writers write into the returned view, and none of them referencesoutputdirectly any more. This removes the evaluation-order hazard for every opcode, not just COPY. A comment on the helper records the remaining invariant: writers must fill the whole view, because growth usesallocUnsafe.Contract and boundary impact
hydrateinsrc/domain/native/nativeAotPe.ts(domain parser), which is the overlay producer.inspect-native-load-image/inspect_native_load_imagereach this parser through the Ghidra snapshot owner (established from source).derived_overlay.sha256now identifies the hydrated bytes for streams larger than 64 KiB. Address and size semantics are unchanged.Expected effects:
Evidence and regression coverage
src/domain/native/nativeAotPe.hydration.test.ts: 11 success cases compare the full overlay descriptor (address, size, SHA-256) with independently authored expected bytes, and check that the snapshot digest is unchanged. Cases:status: partial,derived_overlay: nulland the specific diagnostic:tests/fixtures/nativeaotPe.ts:nativeAotPeHydrationFixtureauthors an RTR9.1 command stream inside an expanded.rdatasection and computes the expected overlay from writer semantics.origin/main(c537c52c9) failed 3 of 4.[65537],[32768,32769]and[65537,65537]werecompletewith the right size but a wrong digest (for example, the parser reportedabc20979…wherea3253bfa…was expected). The new suite with the fix reverted fails the 5 cases where a COPY triggers growth and passes the others. The non-COPY writers were already correct; their cases guard the new reservation contract.For evidence-bearing changes:
Validation performed
npx vitest run --project domain src/domain/native/nativeAotPe.copyGrowth.test.ts --maxWorkers 1(issue repro, temporary file): on base, 3 failed / 1 passed; with the fix, 4 passed.npx vitest run --project domain src/domain/native/nativeAotPe.hydration.test.ts --maxWorkers 1: 15 passed. With the source fix reverted: 5 failed / 10 passed.npx vitest run src/domain/native src/ghidra/GhidraProvider.behavior.test.ts src/ghidra/GhidraLoadImageAttest.test.ts src/ghidra/extensions/GhidraExtensions.test.ts --maxWorkers 2: 16 files, 334 tests passed.npm run check:fast: passed (typecheck, lint).npm run format:check: passed.Compatibility, safety, and release
Author readiness
Human owner: @kaoru0822-kitauji
Before merge
type(scope): outcome.🤖 Generated with Claude Code
🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.