The nodev mount option specifies that the /dev/shm (temporary filesystem stored in memory) cannot contain block or character special devices. Rationale: Since the /dev/shm filesystem is not intended to support devices, set this option to ensure that users cannot attempt to create special devices in /dev/shm partitions.
Edit the /etc/fstab file and add nodev to the fourth field (mounting options of entries that have mount points that contain /dev/shm). See the fstab(5) manual page for more information. # mount -o remount,nodev /dev/shm Default Value: OS Default: N/A