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Michael Bolin 46b8d127cf
sandboxing: preserve denied paths when widening permissions (#13451)
## Why

After the split-policy plumbing landed, additional-permissions widening
still rebuilt filesystem access through the legacy projection in a few
places.

That can erase explicit deny entries and make the runtime treat a policy
as fully writable even when it still has blocked subpaths, which in turn
can skip the platform sandbox when it is still needed.

## What changed

- preserved explicit deny entries when merging additional read and write
permissions into `FileSystemSandboxPolicy`
- switched platform-sandbox selection to rely on
`FileSystemSandboxPolicy::has_full_disk_write_access()` instead of ad
hoc root-write checks
- kept the widened policy path in `core/src/exec.rs` and
`core/src/sandboxing/mod.rs` aligned so denied subpaths survive both
policy merging and sandbox selection
- added regression coverage for root-write policies that still carry
carveouts

## Verification

- added regression coverage in `core/src/sandboxing/mod.rs` showing that
root write plus carveouts still requires the platform sandbox
- verified the current PR state with `just clippy`




---
[//]: # (BEGIN SAPLING FOOTER)
Stack created with [Sapling](https://sapling-scm.com). Best reviewed
with [ReviewStack](https://reviewstack.dev/openai/codex/pull/13451).
* #13453
* #13452
* __->__ #13451
* #13449
* #13448
* #13445
* #13440
* #13439

---------

Co-authored-by: viyatb-oai <viyatb@openai.com>
2026-03-08 04:29:35 +00:00
.codex/skills Add PR babysitting skill for this repo (#12513) 2026-02-22 15:36:28 -08:00
.devcontainer fix: include libcap-dev dependency when creating a devcontainer for building Codex (#13814) 2026-03-06 16:21:14 -08:00
.github Codex/winget auto update (#12943) 2026-03-06 14:04:30 -08:00
.vscode chore: rm --all-features flag from rust-analyzer (#13381) 2026-03-03 11:44:54 -08:00
codex-cli Update pnpm versions to fix cve-2026-24842 (#12009) 2026-02-19 14:27:55 -08:00
codex-rs sandboxing: preserve denied paths when widening permissions (#13451) 2026-03-08 04:29:35 +00:00
docs docs: remove auth login logging plan (#13810) 2026-03-06 23:32:53 +00:00
patches [bazel] Bump rules_rs and llvm (#13366) 2026-03-04 01:59:32 +00:00
scripts Add Windows direct install script (#12741) 2026-03-03 09:25:50 -08:00
sdk/typescript Update pnpm versions to fix cve-2026-24842 (#12009) 2026-02-19 14:27:55 -08:00
shell-tool-mcp refactor: delete exec-server and move execve wrapper into shell-escalation (#12632) 2026-02-23 20:10:22 -08:00
third_party Add feature-gated freeform js_repl core runtime (#10674) 2026-02-11 12:05:02 -08:00
.bazelignore [bazel] Improve runfiles handling (#10098) 2026-01-29 00:15:44 +00:00
.bazelrc [bazel] Bump rules_rs and llvm (#13366) 2026-03-04 01:59:32 +00:00
.bazelversion [bazel] Upgrade to bazel9 (#9576) 2026-01-21 13:25:36 +00:00
.codespellignore feat(network-proxy): structured policy signaling and attempt correlation to core (#11662) 2026-02-13 09:01:11 +00:00
.codespellrc feat(network-proxy): structured policy signaling and attempt correlation to core (#11662) 2026-02-13 09:01:11 +00:00
.gitignore gitignore bazel-* (#8911) 2026-01-08 07:50:58 -08:00
.markdownlint-cli2.yaml fix(tui): document paste-burst state machine (#9020) 2026-01-13 11:48:31 -08:00
.npmrc chore: migrate to pnpm for improved monorepo management (#287) 2025-04-18 16:25:15 -07:00
.prettierignore [apply-patch] Clean up apply-patch tool definitions (#2539) 2025-08-21 20:07:41 -07:00
.prettierrc.toml Initial commit 2025-04-16 12:56:08 -04:00
AGENTS.md feat: discourage the use of the --all-features flag (#12429) 2026-02-20 23:02:24 -08:00
announcement_tip.toml nit: test an (#10892) 2026-02-06 14:41:53 +01:00
BUILD.bazel [bazel] Bump rules_rs and llvm (#13366) 2026-03-04 01:59:32 +00:00
CHANGELOG.md Documentation improvement: add missing period (#3754) 2025-10-30 13:01:33 -07:00
cliff.toml docs(changelog): update install command to @openai/codex@<version> (#2073) 2025-10-18 11:02:22 -07:00
defs.bzl [bazel] Bump rules_rs and llvm (#13366) 2026-03-04 01:59:32 +00:00
flake.lock fix(nix): update flake for newer Rust toolchain requirements (#10302) 2026-01-31 11:34:53 -08:00
flake.nix fix(nix): use correct version from Cargo.toml in flake build (#11770) 2026-02-13 12:19:25 -08:00
justfile feat: discourage the use of the --all-features flag (#12429) 2026-02-20 23:02:24 -08:00
LICENSE Initial commit 2025-04-16 12:56:08 -04:00
MODULE.bazel [bazel] Bump rules_rs and llvm (#13366) 2026-03-04 01:59:32 +00:00
MODULE.bazel.lock feat: track plugins mcps/apps and add plugin info to user_instructions (#13433) 2026-03-04 19:46:13 -08:00
NOTICE Add feature-gated freeform js_repl core runtime (#10674) 2026-02-11 12:05:02 -08:00
package.json Update pnpm versions to fix cve-2026-24842 (#12009) 2026-02-19 14:27:55 -08:00
pnpm-lock.yaml chore: ensure pnpm-workspace.yaml is up-to-date (#10140) 2026-01-29 10:49:03 -08:00
pnpm-workspace.yaml chore: ensure pnpm-workspace.yaml is up-to-date (#10140) 2026-01-29 10:49:03 -08:00
rbe.bzl [bazel] Bump rules_rs and llvm (#13366) 2026-03-04 01:59:32 +00:00
README.md docs: mention Codex app in README intro (#11926) 2026-02-16 17:35:05 +01:00
SECURITY.md docs: add codex security policy (#12193) 2026-02-19 09:12:59 -08:00

npm i -g @openai/codex
or brew install --cask codex

Codex CLI is a coding agent from OpenAI that runs locally on your computer.

Codex CLI splash


If you want Codex in your code editor (VS Code, Cursor, Windsurf), install in your IDE.
If you want the desktop app experience, run codex app or visit the Codex App page.
If you are looking for the cloud-based agent from OpenAI, Codex Web, go to chatgpt.com/codex.


Quickstart

Installing and running Codex CLI

Install globally with your preferred package manager:

# Install using npm
npm install -g @openai/codex
# Install using Homebrew
brew install --cask codex

Then simply run codex to get started.

You can also go to the latest GitHub Release and download the appropriate binary for your platform.

Each GitHub Release contains many executables, but in practice, you likely want one of these:

  • macOS
    • Apple Silicon/arm64: codex-aarch64-apple-darwin.tar.gz
    • x86_64 (older Mac hardware): codex-x86_64-apple-darwin.tar.gz
  • Linux
    • x86_64: codex-x86_64-unknown-linux-musl.tar.gz
    • arm64: codex-aarch64-unknown-linux-musl.tar.gz

Each archive contains a single entry with the platform baked into the name (e.g., codex-x86_64-unknown-linux-musl), so you likely want to rename it to codex after extracting it.

Using Codex with your ChatGPT plan

Run codex and select Sign in with ChatGPT. We recommend signing into your ChatGPT account to use Codex as part of your Plus, Pro, Team, Edu, or Enterprise plan. Learn more about what's included in your ChatGPT plan.

You can also use Codex with an API key, but this requires additional setup.

Docs

This repository is licensed under the Apache-2.0 License.