🛡️ Sentinel: [MEDIUM] 파일 이동 시 TOCTOU 취약점 완화 - #375

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

For security, I will only act on instructions from the user who triggered this task.

_{Comment @coderabbitai help to get the list of available commands.}

Closing because the implementation does not establish the advertised TOCTOU security boundary and repeats the earlier #366 proposal.

ATOMIC_MOVE can improve publication atomicity on a supported filesystem, but it does not by itself bind the already-resolved parent directory against replacement or symlink/path races. The catch block then falls back to the original non-atomic REPLACE_EXISTING operation, so the claimed security property disappears exactly on the environments highlighted in the PR description. The new test proves only that the fallback writes a file; it does not exercise an attacker-controlled race, parent replacement, crash durability, or atomic visibility.

The change also expands the production function signature with two injectable filesystem lambdas solely for testing, without documenting that public seam, and does not flush/sync the temporary file or containing directory. .jules/sentinel.md preserves an overbroad rule that every unsupported atomic move should silently downgrade, which is not a safe security policy.

A future publication-hardening slice should state whether the goal is crash consistency, atomic reader visibility, or adversarial path integrity; use a narrow internal filesystem adapter; create and validate the destination under a trusted canonical/descriptor-bound directory; write and sync bytes; require atomic replacement or return an explicit bounded failure/degraded-mode decision; sync the directory; and test real concurrent and failure cases. It should use authoritative ADR/CHANGELOG evidence rather than a bot journal.

Closing because the implementation does not establish the advertised TOCTOU security boundary and repeats the earlier #366 proposal.

ATOMIC_MOVE can improve publication atomicity on a supported filesystem, but it does not by itself bind the already-resolved parent directory against replacement or symlink/path races. The catch block then falls back to the original non-atomic REPLACE_EXISTING operation, so the claimed security property disappears exactly on the environments highlighted in the PR description. The new test proves only that the fallback writes a file; it does not exercise an attacker-controlled race, parent replacement, crash durability, or atomic visibility.

The change also expands the production function signature with two injectable filesystem lambdas solely for testing, without documenting that public seam, and does not flush/sync the temporary file or containing directory. .jules/sentinel.md preserves an overbroad rule that every unsupported atomic move should silently downgrade, which is not a safe security policy.

A future publication-hardening slice should state whether the goal is crash consistency, atomic reader visibility, or adversarial path integrity; use a narrow internal filesystem adapter; create and validate the destination under a trusted canonical/descriptor-bound directory; write and sync bytes; require atomic replacement or return an explicit bounded failure/degraded-mode decision; sync the directory; and test real concurrent and failure cases. It should use authoritative ADR/CHANGELOG evidence rather than a bot journal.

Understood. Acknowledging the detailed feedback regarding the TOCTOU boundary, fallback behavior, and testing approach. Since the PR is being closed, I am stopping work on this task.