keeley-openai b8f880bc38 Reject replaceable symlinks in pre-sandbox executable lookup (#55384)
## Why

A read-only executable target does not make its lookup path trustworthy: a symlink or ancestor directory may still be replaceable through writes allowed by the filesystem policy.

## What changed

Check the original lookup path, resolved parent aliases, and canonical target before selecting a pre-sandbox executable such as `bwrap`. Account for sticky directory ownership when deciding whether a child can be replaced, while preserving read-only mount carveouts.

Resolve `PATH` entries individually, including relative entries when the working directory contains a colon.

## Testing

Add regression tests for writable symlinks to read-only executables and symlinked search directories into writable roots. Extend search-path coverage to relative entries and a working directory containing a colon, and update the protected system installation test to use a direct executable path.

GitOrigin-RevId: 18d0cb6e809e5abd1313315670d4e2ff91dcfb30
2026-10-19 21:26:58 +00:00
2026-04-24 17:49:29 -07:00
2025-04-16 12:56:08 -04:00
2025-04-16 12:56:08 -04:00
2026-04-24 17:49:29 -07:00
2026-08-21 16:45:05 +00:00

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This repository is licensed under the Apache-2.0 License.

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