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Sticky Bit

A Unix permission that, on directories, restricts file deletion to the file's owner even when the directory is writable by others. Common on /tmp and similar shared directories.

The sticky bit, when set on a directory, prevents users from deleting or renaming files they don't own even though the directory itself is writable, used famously on /tmp so users can create files there without being able to mess with each other's. As a Unix permission concept, defenders inspect the sticky bit during system audits to verify expected hardening on shared directories. It is foundational Linux-permissions literacy alongside SUID and SGID.

Introduced in: Operating Systems for Defenders

Examples

  • /tmp being world-writable but protected by the sticky bit.
  • Preventing users from deleting each other's files in a shared directory.
  • Auditing the sticky bit on shared directories during hardening.

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