feat(linux-sandbox): add bwrap support#9938
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## Summary Vendor Bubblewrap into the repo and add minimal build plumbing in `codex-linux-sandbox` to compile/link it. ## Why We want to move Linux sandboxing toward Bubblewrap, but in a safe two-step rollout: 1) vendoring/build setup (this PR), 2) runtime integration (follow-up PR). ## Included - Add `codex-rs/vendor/bubblewrap` sources. - Add build-time FFI path in `codex-rs/linux-sandbox`. - Update `build.rs` rerun tracking for vendored files. - Small vendored compile warning fix (`sockaddr_nl` full init). follow up in #9938
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| /// Execute the build-time bubblewrap `main` function with the given argv. | ||
| pub(crate) fn exec_vendored_bwrap(argv: Vec<String>) -> ! { | ||
| let exit_code = run_vendored_bwrap_main(&argv); |
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Hmm, so this appears to be the end of main():
where:
if (execvp (exec_path, argv) == -1)
leads to:
die_with_error ("execvp %s", exec_path);
but if execvp() does not return -1, then bwrap's main returns 0, even though that suggests something has gone horribly wrong?
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OK, a handful of questions/clarifications!
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Summary
This PR introduces a gated Bubblewrap (bwrap) Linux sandbox path. The curent Linux sandbox path relies on in-process restrictions (including Landlock). Bubblewrap gives us a more uniform filesystem isolation model, especially explicit writable roots with the option to make some directories read-only and granular network controls.
This is behind a feature flag so we can validate behavior safely before making it the default.
features.use_linux_sandbox_bwrap