🛡️ Sentinel: [HIGH] Fix insecure file creation permissions

[acebytes]

🚨 Severity: HIGH
💡 Vulnerability: Fixed insecure file creation permissions
🎯 Impact: Fixed a race condition where files could momentarily exist with default permissions
🔧 Fix: Fixed insecure file creation permissions by explicitly specifying permissions at the moment of creation
✅ Verification: Ran unit tests and verified secure temp file creation

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PR created automatically by Jules for task 208263635084421537 started by @acebytes

[google-labs-jules]

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve exact 0600 despite umask

In environments where the helper or tests run with a restrictive umask that masks owner bits (for example umask 0777), open(..., 0o600) creates the temp file with the mode after umask (e.g. 0000) and the subsequent rename preserves that mode. The previous setAttributes(.posixPermissions: 0o600) corrected this before rename, and testJournalFilePermissions expects the final journal to be exactly 0600; add an fchmod(fd, 0o600) after opening so the final file mode does not depend on process umask.

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[acebytes]

🛡️ Triage canonical — Security (P0)

This PR is the canonical fix for TOCTOU / insecure-file-creation in Sources/CacheoutHelperLib/SysctlJournal.swift. The following duplicate Sentinel PRs were closed in favor of this one: #301, #311, #327, #328, #332, #338, #344, #349, #351, #354, #356, #360, #369, #371, #375, #380, #384, #386, #390, #395 (plus #333 which spanned this file + others).

Please review and merge or reject — that will unblock the bot from regenerating this category.

[google-labs-jules]

🛡️ Triage canonical — Security (P0)

This PR is the canonical fix for TOCTOU / insecure-file-creation in Sources/CacheoutHelperLib/SysctlJournal.swift. The following duplicate Sentinel PRs were closed in favor of this one: #301, #311, #327, #328, #332, #338, #344, #349, #351, #354, #356, #360, #369, #371, #375, #380, #384, #386, #390, #395 (plus #333 which spanned this file + others).

Please review and merge or reject — that will unblock the bot from regenerating this category.

Acknowledged.