safishamsi and Claude Opus 4.8
f52b8dbc69
harden(bash): stop .. source paths escaping the corpus tree ( #2596 )
...
The #2690 form-3 (`$(dirname …)`) branch had no `..` guard and the tracked
form-4 branch let `..` walk past the base to an arbitrary host path, so a
hostile corpus could make the extractor stat and record an out-of-tree file
(source "$(dirname "$VAR")/../../../../etc/passwd") — a corpus-side info leak,
since resolve_bash_source_edges only filters *resolved* cross-file edges, not
the extractor's own edge/probe. Adds a lexical _within_tree gate: form 3
rejects `..` outright (its base is a guess), and a tracked form-4 base may
reach a sibling via $VAR/../lib but cannot escape past base.parent. Adds two
traversal-rejection tests.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com >
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