mirror of
https://github.com/openai/codex.git
synced 2026-04-30 09:26:44 +00:00
806e5f7c69
## Summary - add a Linux startup warning when system `bwrap` is present but cannot create user namespaces - keep the Linux-specific probe, sandbox-policy gate, and stderr matching in `codex-sandboxing` - polish the missing-`bwrap` warning to point users at the sandbox prerequisites and OS package-manager install path ## Details - probes system `bwrap` with `--unshare-user`, `--unshare-net`, and a minimal bind before command execution - detects known bubblewrap setup failures for `RTM_NEWADDR`, `RTM_NEWLINK`, uid-map permission denial, and `No permissions to create a new namespace` - preserves the existing suppression for sandbox-bypassed policies such as `danger-full-access` and `external-sandbox` - updates the Linux sandbox docs to call out the user-namespace requirement --------- Co-authored-by: Codex <noreply@openai.com>
73 lines
4.3 KiB
Markdown
73 lines
4.3 KiB
Markdown
# codex-linux-sandbox
|
|
|
|
This crate is responsible for producing:
|
|
|
|
- a `codex-linux-sandbox` standalone executable for Linux that is bundled with the Node.js version of the Codex CLI
|
|
- a lib crate that exposes the business logic of the executable as `run_main()` so that
|
|
- the `codex-exec` CLI can check if its arg0 is `codex-linux-sandbox` and, if so, execute as if it were `codex-linux-sandbox`
|
|
- this should also be true of the `codex` multitool CLI
|
|
|
|
On Linux, the bubblewrap pipeline prefers the first `bwrap` found on `PATH`
|
|
outside the current working directory whenever it is available. If `bwrap` is
|
|
present but too old to support
|
|
`--argv0`, the helper keeps using system bubblewrap and switches to a
|
|
no-`--argv0` compatibility path for the inner re-exec. If `bwrap` is missing,
|
|
the helper falls back to the vendored bubblewrap path compiled into this
|
|
binary.
|
|
Codex also surfaces a startup warning when `bwrap` is missing so users know it
|
|
is falling back to the vendored helper. Codex surfaces the same startup warning
|
|
path when bubblewrap cannot create user namespaces.
|
|
|
|
**Current Behavior**
|
|
- Legacy `SandboxPolicy` / `sandbox_mode` configs remain supported.
|
|
- Bubblewrap is the default filesystem sandbox pipeline.
|
|
- If `bwrap` is present on `PATH` outside the current working directory, the
|
|
helper uses it.
|
|
- If `bwrap` is present but too old to support `--argv0`, the helper uses a
|
|
no-`--argv0` compatibility path for the inner re-exec.
|
|
- If `bwrap` is missing, the helper falls back to the vendored bubblewrap
|
|
path.
|
|
- If `bwrap` is missing, Codex also surfaces a startup warning instead of
|
|
printing directly from the sandbox helper.
|
|
- If bubblewrap cannot create user namespaces, Codex surfaces a startup warning
|
|
instead of waiting for a runtime sandbox failure.
|
|
- Legacy Landlock + mount protections remain available as an explicit legacy
|
|
fallback path.
|
|
- Set `features.use_legacy_landlock = true` (or CLI `-c use_legacy_landlock=true`)
|
|
to force the legacy Landlock fallback.
|
|
- The legacy Landlock fallback is used only when the split filesystem policy is
|
|
sandbox-equivalent to the legacy model after `cwd` resolution.
|
|
- Split-only filesystem policies that do not round-trip through the legacy
|
|
`SandboxPolicy` model stay on bubblewrap so nested read-only or denied
|
|
carveouts are preserved.
|
|
- When the default bubblewrap pipeline is active, the helper applies `PR_SET_NO_NEW_PRIVS` and a
|
|
seccomp network filter in-process.
|
|
- When the default bubblewrap pipeline is active, the filesystem is read-only by default via `--ro-bind / /`.
|
|
- When the default bubblewrap pipeline is active, writable roots are layered with `--bind <root> <root>`.
|
|
- When the default bubblewrap pipeline is active, protected subpaths under writable roots (for
|
|
example `.git`,
|
|
resolved `gitdir:`, and `.codex`) are re-applied as read-only via `--ro-bind`.
|
|
- When the default bubblewrap pipeline is active, overlapping split-policy
|
|
entries are applied in path-specificity order so narrower writable children
|
|
can reopen broader read-only or denied parents while narrower denied subpaths
|
|
still win. For example, `/repo = write`, `/repo/a = none`, `/repo/a/b = write`
|
|
keeps `/repo` writable, denies `/repo/a`, and reopens `/repo/a/b` as
|
|
writable again.
|
|
- When the default bubblewrap pipeline is active, symlink-in-path and non-existent protected paths inside
|
|
writable roots are blocked by mounting `/dev/null` on the symlink or first
|
|
missing component.
|
|
- When the default bubblewrap pipeline is active, the helper explicitly isolates the user namespace via
|
|
`--unshare-user` and the PID namespace via `--unshare-pid`.
|
|
- When the default bubblewrap pipeline is active and network is restricted without proxy routing, the helper also
|
|
isolates the network namespace via `--unshare-net`.
|
|
- In managed proxy mode, the helper uses `--unshare-net` plus an internal
|
|
TCP->UDS->TCP routing bridge so tool traffic reaches only configured proxy
|
|
endpoints.
|
|
- In managed proxy mode, after the bridge is live, seccomp blocks new
|
|
AF_UNIX/socketpair creation for the user command.
|
|
- When the default bubblewrap pipeline is active, it mounts a fresh `/proc` via `--proc /proc` by default, but
|
|
you can skip this in restrictive container environments with `--no-proc`.
|
|
|
|
**Notes**
|
|
- The CLI surface still uses legacy names like `codex debug landlock`.
|