chmod u-s /usr/bin/chage chmod u-s /usr/bin/gpasswd chmod u-s /usr/bin/chfn chmod u-s /usr/bin/chsh chmod u-s /usr/bin/newgrp chmod u-s /usr/sbin/usernetctl chmod u-s /bin/mount chmod u-s /bin/umount chmod g-s /usr/bin/wall chmod g-s /usr/bin/write chmod g-s /sbin/netreport