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viyatb-oai 3377afd84a fix(network-proxy): harden linux proxy bridge helpers (#20001 )

## Why
The Linux managed-proxy bridge helpers are long-lived child processes in
the sandbox networking path. Before this change they stayed dumpable and
the network seccomp profile did not block cross-process memory syscalls,
so another same-user process could potentially inspect or modify bridge
memory instead of interacting only through the intended proxy interface.

## What changed
- reuse the shared `codex-process-hardening` helper to mark bridge
helper children non-dumpable before they begin serving
- deny `process_vm_readv` and `process_vm_writev` in the existing
network seccomp filter

## Security impact
Bridge helpers are less exposed to same-user cross-process inspection or
memory writes, which reduces the chance that sandboxed code can
interfere with proxy support processes outside the intended IPC path.

## Verification
- `cargo test -p codex-process-hardening`
- `cargo test -p codex-linux-sandbox`
- attempted `cargo check -p codex-linux-sandbox --target
x86_64-unknown-linux-gnu`; blocked on missing `x86_64-linux-gnu-gcc` on
this macOS host

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Co-authored-by: Codex <noreply@openai.com>

2026-04-28 11:52:50 -07:00

src

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BUILD.bazel

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Cargo.toml

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README.md

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README.md

codex-process-hardening

This crate provides pre_main_hardening(), which is designed to be called pre-main() (using #[ctor::ctor]) to perform various process hardening steps, such as

disabling core dumps
disabling ptrace attach on Linux and macOS
removing dangerous or noisy environment variables such as LD_PRELOAD, DYLD_*, and macOS malloc stack-logging controls