viyatb-oai 2259031d64 fix: fallback to Landlock-only when user namespaces unavailable and set PR_SET_NO_NEW_PRIVS early (#9250)
fixes https://github.com/openai/codex/issues/9236

### Motivation
- Prevent sandbox setup from failing when unprivileged user namespaces
are denied so Landlock-only protections can still be applied.
- Ensure `PR_SET_NO_NEW_PRIVS` is set before installing seccomp and
Landlock restrictions to avoid kernel `EPERM`/`LandlockRestrict`
ordering issues.

### Description
- Add `is_permission_denied` helper that detects `EPERM` /
`PermissionDenied` from `CodexErr` to drive fallback logic.
- In `apply_read_only_mounts` skip read-only bind-mount setup and return
`Ok(())` when `unshare_user_and_mount_namespaces()` fails with
permission-denied so Landlock rules can still be installed.
- Add `set_no_new_privs()` and call it from
`apply_sandbox_policy_to_current_thread` before installing seccomp
filters and Landlock rules when disk or network access is restricted.
2026-01-14 22:24:34 -08:00
2026-01-08 07:50:58 -08:00
2025-04-16 12:56:08 -04:00
2025-10-17 12:19:08 -07:00
2025-10-17 12:19:08 -07:00
2025-04-16 12:56:08 -04:00
2025-07-31 00:06:55 +00:00
2025-04-18 17:01:11 -07:00
2026-01-02 15:23:22 -07:00

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