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fix(sandboxing): reject WSL1 bubblewrap sandboxing (#17559)

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## Summary

- detect WSL1 before Codex probes or invokes the Linux bubblewrap
sandbox
- fail early with a clear unsupported-operation message when a command
would require bubblewrap on WSL1
- document that WSL2 follows the normal Linux bubblewrap path while WSL1
is unsupported

## Why

Codex 0.115.0 made bubblewrap the default Linux sandbox. WSL1 cannot
create the user namespaces that bubblewrap needs, so shell commands
currently fail later with a raw bwrap namespace error. This makes the
unsupported environment explicit and keeps non-bubblewrap paths
unchanged.

The WSL detection reads /proc/version, lets an explicit WSL<version>
marker decide WSL1 vs WSL2+, and only treats a bare Microsoft marker as
WSL1 when no explicit WSL version is present.

addresses https://github.com/openai/codex/issues/16076

---------

Co-authored-by: Codex <noreply@openai.com>
This commit is contained in:
viyatb-oai
2026-04-12 14:08:14 -07:00
committed by GitHub
co-authored by Codex
parent a4d5112b37
commit cb870a169a
7 changed files with 169 additions and 2 deletions
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codex-rs/core/README.md
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@@ -42,7 +42,11 @@ switches to a no-`--argv0` compatibility path for the inner re-exec. If
`bwrap` is missing, it falls back to the vendored bubblewrap path compiled into
the binary and Codex surfaces a startup warning through its normal notification
path instead of printing directly from the sandbox helper. Codex also surfaces
a startup warning when bubblewrap cannot create user namespaces.
a startup warning when bubblewrap cannot create user namespaces. WSL2 uses the
normal Linux bubblewrap path. WSL1 is not supported for bubblewrap sandboxing
because it cannot create the required user namespaces, so Codex rejects
sandboxed shell commands that would enter the bubblewrap path before invoking
`bwrap`.
### Windows