ae4de43ccc
## Summary This PR introduces a gated Bubblewrap (bwrap) Linux sandbox path. The curent Linux sandbox path relies on in-process restrictions (including Landlock). Bubblewrap gives us a more uniform filesystem isolation model, especially explicit writable roots with the option to make some directories read-only and granular network controls. This is behind a feature flag so we can validate behavior safely before making it the default. - Added temporary rollout flag: - `features.use_linux_sandbox_bwrap` - Preserved existing default path when the flag is off. - In Bubblewrap mode: - Added internal retry without /proc when /proc mount is not permitted by the host/container.
33 lines
1.8 KiB
Markdown
33 lines
1.8 KiB
Markdown
# codex-linux-sandbox
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This crate is responsible for producing:
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- a `codex-linux-sandbox` standalone executable for Linux that is bundled with the Node.js version of the Codex CLI
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- a lib crate that exposes the business logic of the executable as `run_main()` so that
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- the `codex-exec` CLI can check if its arg0 is `codex-linux-sandbox` and, if so, execute as if it were `codex-linux-sandbox`
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- this should also be true of the `codex` multitool CLI
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On Linux, the bubblewrap pipeline uses the vendored bubblewrap path compiled
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into this binary.
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**Current Behavior**
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- Legacy Landlock + mount protections remain available as the legacy pipeline.
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- The bubblewrap pipeline is standardized on the vendored path.
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- During rollout, the bubblewrap pipeline is gated by the temporary feature
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flag `use_linux_sandbox_bwrap` (CLI `-c` alias for
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`features.use_linux_sandbox_bwrap`; legacy remains default when off).
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- When enabled, the bubblewrap pipeline applies `PR_SET_NO_NEW_PRIVS` and a
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seccomp network filter in-process.
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- When enabled, the filesystem is read-only by default via `--ro-bind / /`.
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- When enabled, writable roots are layered with `--bind <root> <root>`.
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- When enabled, protected subpaths under writable roots (for example `.git`,
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resolved `gitdir:`, and `.codex`) are re-applied as read-only via `--ro-bind`.
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- When enabled, symlink-in-path and non-existent protected paths inside
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writable roots are blocked by mounting `/dev/null` on the symlink or first
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missing component.
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- When enabled, the helper isolates the PID namespace via `--unshare-pid`.
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- When enabled, it mounts a fresh `/proc` via `--proc /proc` by default, but
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you can skip this in restrictive container environments with `--no-proc`.
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**Notes**
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- The CLI surface still uses legacy names like `codex debug landlock`.
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