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Garry Tan
be509bfab4
restrictDirectoryPermissions unconditionally chmodded its target. On hosts where the process holds CAP_FOWNER (Docker as root, CI sandboxes) that chmod SUCCEEDS on root-owned /tmp whenever a state file is configured there (BROWSE_STATE_FILE=/tmp/x.json derives stateDir=/tmp), and a 0700 /tmp breaks access(2)-based checks machine-wide for every other process. The POSIX branch now refuses shared sticky dirs, world-writable mounts under root, foreign-owned dirs, and symlinked state dirs; refusals warn once per process instead of failing silent; owned-but-unreadable dirs keep their chmod self-repair; and the check-then-act race is closed with fd-anchored O_NOFOLLOW + fstat/fchmod on a single inode. Regression tests cover the sticky-dir, foreign-uid, mkdirSecure-reapply, and symlinked-dir shapes.