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[PR #4156] [CLOSED] fix(ghidra): compare DOS relocation windows with final loaded bytes #6094
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opened 2026-10-31 01:11:48 +00:00 by bsakaguchi
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📋 Pull Request Information
Original PR: https://github.com/morluto/rea/pull/4156
Author: @berelels
Created: 10/15/2026
Status: ❌ Closed
Base:
main← Head:fix/dos-overlapping-relocation-windows📝 Commits (1)
297a649fix(ghidra): compare DOS relocation windows with final loaded bytes📊 Changes
2 files changed (+110 additions, -4 deletions)
View changed files
📝
src/ghidra/GhidraLoadImageValues.test.ts(+101 -0)📝
src/ghidra/GhidraLoadImageValues.ts(+9 -4)📄 Description
Summary
Fixes #3981.
inspect_native_load_imagereportedmismatchfor a DOS MZ image whose relocation words overlap, even when Ghidra's loaded bytes are correct. The expectedmemory_bytes_hexfor each relocation record was captured mid-application. The bridge reads each record's window from the loaded Program after every fixup, so a later overlapping relocation changed it.Problem and expected behavior
attestGhidraDosLoadImageapplied relocations in table order and recorded each record's memory window right after its own fixup. With records at module offsets 9 then 8, the second fixup rewrites byte 9, so the first record's final window differs from the window captured right after its own fixup.bridge/ghidra/ReaGhidraBridge.java(relocation enumeration) readscurrentProgram.getMemory()at observation time, after loading.Change and scope
valuesand sameoriginal_bytes_hex. Expected memory windows are now read from the fully relocated buffer once every fixup has been applied.relocation_records.Contribution scope: an ordinary fix within existing boundaries, so no maintainer scope decision is needed.
Contract and boundary impact
Semantic owner and earliest changed stage:
src/ghidra/GhidraLoadImageValues.ts, DOS MZ expected relocation records.Contribution scope fit and linked maintainer decision: not applicable (bug fix).
CLI and MCP/tool-catalog contract: unchanged schemas. A false
mismatchbecomesverified.Provider, bridge, target-format, or platform compatibility: bridge unchanged.
Evidence, artifact, provenance, or reconstruction contract: load-image attestation now matches the documented "current loaded Program" comparison (
docs/ghidra-dos.md, Loaded-image evidence).Target selection, authority, upstream behavior, and cleanup details: not applicable.
Generated metadata, package, or installation impact: none.
Read existing files or captured data.
Launch or attach to a process.
Inject instrumentation or run scripts/code.
Change process memory, registers, files, or configuration.
Contact network services.
Recover protected code or work around protections.
Documentation or usability only; no target interaction.
Not sure yet; investigation or maintainer guidance needed.
Evidence and regression coverage
src/ghidra/GhidraLoadImageValues.test.ts, "overlapping DOS MZ relocations". The fixture uses the module bytes and relocation observations measured from real Ghidra 12.1.4 for relocations at offsets 9 then 8. It assertsverifiedwith both records retained, and that substituting the intermediate0410window fails onlyrelocation_records.main(cd64e24ff) and passes with the fix.open_binary+inspect_native_load_imageontests/conformance/ghidra/dos-mz-fixture.mjs, with only its relocation table changed.9,8: loaded bytes at module+8..10 are00 14 10. Base:mismatch(onlyrelocation_records; expected0410, observed1410at 0x10009). This branch:verified.MzLoader(12.1.4 source) computes each fixup from the original file word and applies fixups inHashSetorder. For chained overlaps (table8,9) and duplicates (9,9), Ghidra's records and bytes differ from cumulative DOS loading, and REA still reportsmismatch. That is correct, since the loaded image differs from a DOS load. For table8,9, the loaded bytes differed between two real runs (00 04 10, then00 14 10). This deserves its own issue.For evidence-bearing changes:
Validation performed
npm run test:local -- src/ghidra/GhidraLoadImageValues.test.ts: 38 passed + 1 failed on base, 39 passed with the fix.npm run test:focused -- src/ghidra/GhidraLoadImageValues.test.ts src/ghidra/GhidraDosComLoadImage.test.ts src/ghidra/GhidraRawBinaryLoadImage.test.ts src/ghidra/GhidraProvider.behavior.test.ts tests/boundary/cli/nativeEfficiencyComparison.test.ts …: 9 files, 205 tests passed (combined run with the #3970 branch's files).npm run check:fast(pre-push): 2/2 tasks successful.node scripts/rea.mjs mcpover stdio, built tree): results above, run before and after the fix.Compatibility, safety, and release
Author readiness
Human owner: @berelels
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.