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[GH-ISSUE #3397] [Bug] Unnamed ELF read-only sections lose embedded Rust compiler-path evidence #1261
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opened 2026-10-16 21:03:31 +00:00 by bsakaguchi
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Originally created by @coygeek on GitHub (Oct 14, 2026).
Original GitHub issue: https://github.com/morluto/rea/issues/3397
Before submitting
Area
Native analysis or decompilation
Observed behavior
inspect-rust-binaryreturnsrustc_commit: nullfor a valid ELF whose allocated read-only data section has no name, even though that section contains a complete compiler path. The same bytes in a named section return the hash and its correct file offset. Removing the optional section-name table also returns null. The result says that no compiler path was found in read-only data without exposing the skipped coverage.All three public CLI commands exit 0. The compiler-path bytes and their offset are identical in all variants. The omission was reproduced through the public CLI with independently constructed inputs.
Reproduction
SHT_PROGBITSsection. The unnamed variant changes only that section's four-byte name index to zero. The third variant removes the optional section-name table.normalized_result.rustc_commitin the three results. The named control returns the inferred hash at file offset 640. Both other variants return null and the absence limitation quoted below.Expected behavior
All three inspections should retain the same inferred compiler hash at file offset 640. Empty section names and an absent section-name string table are valid ELF representations. The section's type, allocation flag, file range, read-only permissions, and embedded path remain sufficient to identify its read-only data. The missing dependency section should continue to return
auditable_metadata: null.docs/rust-binaries.md:42describes compiler-path inference from read-only data.tests/boundary/rust/rustBinaryImage.test.ts:115explicitly preserves such evidence when a section's name cannot fit the name-decoding window.Impact and scope
Impact level: P2. Assessment status: supported. A documented static evidence facet silently loses a present compiler path for the reproduced valid ELF representations and reports absence without exposing skipped coverage. No artifact bytes are modified by inspection. Prevalence in compiler-produced binaries was not measured.
Workaround status: unverified. An external ELF reader could inspect the same read-only bytes, but that workflow was not executed. Naming a section in an artifact copy changes its bytes and digest, so the passing named control does not preserve the selected artifact's identity as a workaround.
REA version
6.4.0 (main at
8dde6370d0)Runtime and platform
Node.js v26.10.0 on macOS 27.0.1. The compiled checkout runtime was used, and REA reports version 6.4.0. The host architecture was not recorded in the reproduction evidence; the fixture architecture is x86-64.
Target and artifact context
Three independently constructed 768-byte ELF64 little-endian x86-64 executables contain
/rustc/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/library/coreat file offset 640. Their data section is allocated, file-backedSHT_PROGBITS, and read-only. The named control has a.rodataname; the unnamed variant sets the name index to zero; the final variant removes the optional section-name table. The compiler-path bytes and file offset remain identical. No.dep-v0dependency section is present, and no target program or external analysis engine needs to run.Interface
CLI
Earliest failure stage
Native analysis or reconstruction
Relevant output or evidence
The observed named-control value of
normalized_result.rustc_commit, followed by the observed value and limitation for both other variants:Evidence provenance: observed. Local verification: reproduced. Reproduction completeness: complete.
Typed outcome or recovery expected
Repeat the three commands. Each must retain the same hash and offset while preserving the selected file's own digest and leaving
auditable_metadatanull. A control with the data section made writable must still omit the hash, so restoration does not turn compiler inference into an unrestricted byte-string scan. This writable control is a restoration requirement; its result was not recorded in the reproduction evidence.Analysis or suspected cause
Source-derived reasoning:
src/go/GoElfImage.ts:144skips section recording without a name table, andsrc/go/GoElfImage.ts:263omits unnamed sections.src/rust/RustBinaryImage.ts:109scans only the recorded read-only ranges. These paths explain how unchanged compiler-path bytes in valid read-only sections can disappear from inference when the sections lack names. The CLI outputs above establish the failure; this explanation comes from source inspection.Additional context
@CassieFox23 commented on GitHub (Oct 21, 2026):
Thanks, coygeek, for the fixture builder. From reading main at
01788bac8, not a run: this still looks valid. The filesrc/native/metadata/ElfImage.ts:69drops every section whose name is empty. It also drops every section whose name table is unavailable. That happens before the read-only check at line 80 can keep it. A name index of 0 decodes to an empty name (src/native/metadata/NativeSectionDirectory.ts:181-193). A missingshstrtabsetsname_stateto unavailable (line 172). So neither unnamed variant reaches the read-only scan insrc/rust/RustBinaryImage.ts:122-127. PR #3477 closed on 2026-10-20 without merging. Likely area:native container parsing.🤖 Written with Claude Code (Fable 5.1, verified by Opus 5.5), posted with my OK 🦊