25 lines
1.3 KiB
Markdown
25 lines
1.3 KiB
Markdown
# Entry-Point Runtime — Go
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## Signals to gather
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- Statically linked ELF with `.note.go.buildid`.
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- `.gopclntab` section (function name table) or `Go build ID` strings.
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- Minimal dynamic dependencies (often none) and musl/glibc loader differences.
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- `GODEBUG`, `GOMAXPROCS`, `GOENV` environment variables.
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- Go module artefacts: `go.mod`, `go.sum`.
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## Implementation notes
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- Use ELF parsing to locate `.note.go.buildid`; fallback to scanning the first few MB for `Go build ID`.
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- Distinguish from Rust/C by checking `.dynsym` count, presence of Go-specific section names, and the absence of `GLIBCXX`.
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- For distroless images, rely solely on ELF traits since no package metadata is present.
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- Record binary path and module files as evidence.
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## Evidence & scoring
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- Strong boost for `.note.go.buildid` or `.gopclntab`.
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- Add evidence for module files or env variables.
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- Penalise binaries with high numbers of shared libraries (likely C/C++).
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## Edge cases
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- TinyGo or stripped binaries may lack build IDs—fall back to heuristics (symbol patterns, text section).
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- CGO-enabled binaries include glibc dependencies; still treat as Go but mention CGO in evidence if detected.
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- Supervisors wrapping Go services (e.g., `envoy`) should be handled upstream by wrapper detection.
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