Tag
umask
- Jul 6, 2026 Nine Permission Bits, Three Classes, and No Way to Deny How the mode word is checked at open time, why umask subtracts rather than assigns, and what setuid, setgid and the sticky bit change about the check. computing history
- May 5, 2026 POSIX Mode Bits, umask, and the ACL Mask Interaction How the nine permission bits, the setuid and sticky bits, umask filtering, and POSIX ACL entries combine into one effective permission, and why chmod rewrites an ACL mask. security
- Dec 24, 2025 Permission Checks at Open and the Bits That Change Meaning The mode word is consulted once, at open, against the whole path; umask, the sticky bit, setgid inheritance, and default ACLs each bend the rule in a way that surprises the caller. filesystems