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[GH-ISSUE #7353] [Bug] Imported IL2CPP metadata views return impossible declaring-type relationships #4374
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opened 2026-10-31 00:49:18 +00:00 by bsakaguchi
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Originally created by @coygeek on GitHub (Oct 27, 2026).
Original GitHub issue: https://github.com/morluto/rea/issues/7353
Before submitting
Area
Evidence, artifacts, or reconstruction
Observed behavior
The built CLI accepts synthetic, digest-consistent
inspect_il2cpp_metadataEvidence whosedeclaring_typeidentifies the row itself, forms a two-type cycle, or names type 999 in a two-type collection. A method naming type 999 also passes; adeclaring_types: [999]query returns that method with exit 0. These relationships appear in ordinary successful view Evidence without a diagnostic identifying the invalid owner.Valid nesting, an absent owner (
-1), and historical records omitting newer collections succeed. Invalid field and parameter owners are already rejected, and omitting the requiredtypescollection is rejected. All eleven cases below ran successfully as a reproduction; success here means observing the listed current behavior, not restoration.Reproduction
Use the stated baseline with locked dependencies and its compiled runtime already available, and place the repository-pinned Node.js on PATH. Run this complete shell snippet from the source checkout. It creates only generated Evidence/request/output files in a new temporary directory and invokes the public CLI sequentially. No metadata artifact is opened and no target code executes. The snippet was replayed once exactly as shown; its outcomes matched the independent initial probe.
Expected behavior
A successful IL2CPP metadata view should preserve usable declaring-type relationships: each nonnegative owner identifies a type position in the same retained inventory, and an enclosing-type chain terminates at a top-level type. An impossible relationship in imported Evidence should produce a typed invalid-input result instead of an ordinary successful metadata page. Valid nested relationships, absent references and historical omissions must remain usable.
The expectation follows the documented positional metadata-index contract and the semantic meaning of an enclosing type. The producer's explicit bounds/self-nesting/cycle refusals establish those format invariants; the view independently parses imported payloads as the same owning metadata model. Existing member-owner checks are a control supporting that import behavior, not the sole basis for extending producer rules to imports.
Impact and scope
P2: callers can receive an unresolvable or impossible type relationship as retained metadata and can select a method under a type that does not exist. The demonstrated exposure is deliberately inconsistent imported Evidence through the CLI. A normal producer cannot emit these relationships because its decoder rejects them. No crash, target modification, security boundary crossing, real-game incidence, or downstream consumer failure was established. NOT_ENOUGH_INFO: naturally occurring affected records and their frequency are unknown; no practical recovery workflow was tested.
REA version
rea-agents6.8.0, source revisionace4dbf36e8c8f36a0e192aff9a11484ed428358.Runtime and platform
Node.js v24.22.1; macOS 27.0.1; arm64. The parent prepared the compiled runtime; the verifier used it without rebuilding or installing software. No Unity, native binary, Hopper, Ghidra, live service, or target application was used.
Target and artifact context
Generated version-29 IL2CPP metadata Evidence with two positional type definitions, one method, one image, a synthetic artifact identity, and no binary link. Section rows use ordered, nonoverlapping extents within the declared artifact size. The artifact path and digest are fixture labels; no corresponding artifact file is required or accessed. Every variant gets its own freshly computed Evidence identifier and passes Evidence parsing before the CLI call.
Interface
CLI
Earliest failure stage
Request parsing or validation
Relevant output or evidence
docs/il2cpp-metadata.md:116documents historical omission;docs/il2cpp-metadata.md:194defines collection position as metadata identity and declaring-type references as positional.src/domain/il2cpp/il2cppMetadata.ts:147and:161define type/method row identity and owner semantics.src/il2cpp/Il2cppMetadataFile.ts:434,:477, and:627reject self-nesting, cycles, and out-of-range method owners. Failure observations use operationobserve_il2cpp_metadata_sourcewith no complete inventory (src/il2cpp/Il2cppMetadataProvider.ts:294); they do not establish a supported truncated positional type table.src/domain/analysisView/il2cppMetadataView.ts:286reads every imported metadata parent withil2cppMetadataParentSchema;src/domain/il2cpp/il2cppMetadata.ts:403validates facts and bounds member/parameter owners but lacks corresponding type/method owner and enclosing-chain checks. The filter atsrc/domain/analysisView/il2cppMetadataView.ts:493matches the retained owner directly. The public CLI replay returned the rows summarized below after Evidence authentication and artifact-identity checks.The field and parameter messages are respectively “Member owner is outside the retained type definitions.” and “Parameter owner is outside the retained method definitions.” Invalid owner acceptance is independent of selected page size: the successful pages show the complete two-type/one-method collections, not a truncated source whose missing rows could contain type 999.
Additional context
Restoration check (proposed, unexecuted): rerun the snippet. The four impossible-owner cases should cease returning normal successful metadata pages and report a typed invalid relationship. The four valid/historical controls should retain their successful facts, and the three existing rejection controls should remain rejected. No fix was attempted.
The supplied all-state issue index and 7,168 archived full issue/PR bodies were searched. Closed completed reports #5751, #5988, and #4709 concern respectively raw generic-container extents, managed identity-error classification, and Electron DOM parents. Their contracts and restoration checks differ. Closed IL2CPP feature PR #5326 describes ownership validation and historical omission, but does not report or resolve the type/method import behavior reproduced here. No exact duplicate was found in that supplied snapshot or the current upstream issue/PR search before submission.
NOT_ENOUGH_INFO: the first affected release and whether a released producer ever saved such a record are unknown. This report makes no security or resource-exhaustion claim.
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