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[PR #2981] [CLOSED] fix(ghidra): warn when Borland SEH handlers fall outside the function body #5535
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opened 2026-10-31 01:07:23 +00:00 by bsakaguchi
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📋 Pull Request Information
Original PR: https://github.com/morluto/rea/pull/2981
Author: @sx4im
Created: 10/13/2026
Status: ❌ Closed
Base:
main← Head:fix/2926-seh-handler-limitations📝 Commits (7)
b8b88f8fix(ghidra): warn when Borland SEH handlers fall outside the function body8611926fix(ghidra): tighten SEH prologue matching and stream boundary scanb40ba8dfix(ghidra): gate SEH matching on 32-bit x86 and preserve handler address spaceeb46d69fix(ghidra): harden SEH detection against non-Win32 targets and complete reference coverageb90ff8bfix(ghidra): recognize zero-valued register FS slots in SEH detectiona61cccdfix(ghidra): stop SEH xor proof at any control-flow instruction961672cfix(ghidra): qualify SEH attribution, hoist target check, require single-entry xor📊 Changes
6 files changed (+388 additions, -51 deletions)
View changed files
📝
bridge/ghidra/ReaGhidraBridge.java(+347 -45)📝
docs/ghidra-provider.md(+7 -3)📝
src/ghidra/GhidraAnalysisProfile.ts(+2 -2)📝
src/ghidra/GhidraFunctionValues.test.ts(+30 -0)📝
src/ghidra/GhidraFunctionValues.ts(+1 -0)📝
tests/boundary/mcp/ghidraEvidenceMcp.test.ts(+1 -1)📄 Description
Summary
Fixes #2926. Delphi and C++Builder register exception handlers through the SEH chain with a
push imm32; push fs:[reg]; mov fs:[reg], espprologue. Ghidra's flow model never follows that chain, so the handler block lands outside the analyzed function body, and REA reported the function's callees, strings, and references as complete with no hint that a handler region was missing.Problem and expected behavior
Smallest trigger: any Delphi function containing a
tryblock. The compiler emits the SEH registration prologue at the function head; Ghidra keeps the pushed handler address out of the function body because nothing in its flow graph reaches it. REA's function views then silently presented incomplete results as complete. Expected: a reader ofprocedure_info,procedure_callees, oranalyze_functionis told when a known handler region is excluded, the same way #2326/#2360 handled truncated bodies from terminal calls.Change and scope
bridge/ghidra/ReaGhidraBridge.javagainssehHandlerLimitations, which scans a function's instructions for the consecutive prologue triple (pushwith a 32-bit scalar operand,pushwith anfs:segment memory operand,movto anfs:segment operand fromesp). When the pushed handler address falls outsidefunction.getBody(), the six function views that already carry terminal-call qualifications (procedure_pseudo_code,procedure_assembly,read_function_instructions,procedure_callees,procedure_callers,procedure_info, plus theanalyze_functiondossier) include an Evidence limitation naming the registration site and the excluded handler address.I took the issue's report branch rather than the seed-as-code branch: the bridge only observes and reports, it does not rewrite Ghidra function bodies. Detection is strict by design. A partial match emits nothing, so a missed variant keeps the old behavior instead of producing noise.
src/ghidra/GhidraAnalysisProfile.tsversions the boundary-observation contract toghidra-terminal-call-limitations-v3so older snapshots cannot replay unqualified results.docs/ghidra-provider.mddocuments the new observation.Follow the contribution scope. Unresolved scope, authority, side effects, or required verification block integration: not applicable, this is an ordinary fix within existing boundaries (read-only observation, no target execution, injection, mutation, or protection recovery).
Contract and boundary impact
ReaGhidraBridge.java), function-view result shaping.push imm32scalar never matches in 16-bit code, and thefs:triple does not occur in 64-bit code).function_boundary_observationsv2 to v3; snapshots recorded under v2 fail profile match on replay, which is the intended invalidation.Expected effects:
Evidence and regression coverage
tests/boundary/mcp/ghidraEvidenceMcp.test.tsnow expects the v3 contract string.getMnemonicString,getNumOperands,getOpObjects,Scalar/Registerchecks,getDefaultOperandRepresentation,function.getBody().contains) already appears in the same file, and the file parses clean under tree-sitter's Java grammar.For evidence-bearing changes:
Validation performed
npm run test:focused -- tests/boundary/mcp/ghidraEvidenceMcp.test.ts— 4/4 passed (1 failed before the profile change, confirming the red step)npm run test:focused -- src/ghidra/GhidraFunctionValues.test.ts— 50/50 passednpm run test:focused -- src/ghidra/GhidraProvider.behavior.test.ts src/ghidra/GhidraSnapshotCache.test.ts— 60/60 passednpm run check:fast— typecheck and lint greennpm run docs:check— greennpm run verify:test-discovery— 1112 test files, greenCompatibility, safety, and release
Before merge
type(scope): outcome.🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.