Binary package “libpam-tmpdir” in ubuntu kinetic

automatic per-user temporary directories

 Many programs use $TMPDIR for storing temporary files. Not
 all of them are good at securing the permissions of those
 files. libpam-tmpdir sets $TMPDIR and $TMP for PAM sessions
 and sets the permissions quite tight. This helps system
 security by having an extra layer of security, making such
 symlink attacks and other /tmp based attacks harder or