InformationThe nodev mount option specifies that the filesystem cannot contain special devices.
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.
SolutionEdit the /etc/fstab file and add nodev to the fourth field (mounting options) for the /dev/shm partition. See the fstab(5) manual page for more information.
Example: vim /etc/fstab
Run the following command to remount /dev/shm :
# mount -o remount,nodev /dev/shm
Some distributions mount /dev/shm through other means and require /dev/shm to be added to /etc/fstab even though it is already being mounted on boot. Others may configure /dev/shm in other locations and may override /etc/fstab configuration. Consult the documentation appropriate for your distribution.
This Benchmark recommendation maps to:
Red Hat Enterprise Linux 7 Security Technical Implementation Guide:
Version 2, Release: 3 Benchmark Date: 26 Apr 2019
Vul ID: V-81009
Rule ID: SV-95721r2_rule
STIG ID: RHEL-07-021022
Severity: CAT III