====== 1.1.16 Ensure nosuid option set on /dev/shm partition (Scored) ======
=====Profile Applicability=====  
<code>
Level 1 - Server 
Level 1 - Workstation
</code>
=====Description=====
The ''nosuid'' mount option specifies that the filesystem cannot contain ''setuid'' files.
=====Rationale=====
Setting this option on a file system prevents users from introducing privileged programs onto the system and allowing non-root users to execute them.
=====Audit===== 
Run the following command and verify that the ''nosuid'' option is set on ''/dev/shm''.
<Code:bash>
# mount | grep /dev/shm 
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev,noexec,relatime)
</Code>
=====Remediation===== 
Edit the ''/etc/fstab'' file and add ''nosuid'' to the fourth field (mounting options) for the ''/dev/shm'' partition. See the ''fstab(5)'' manual page for more information.
Run the following command to remount ''/dev/shm'':
<Code:bash>
# mount -o remount,nosuid /dev/shm
</Code>
=====Notes===== 
''/dev/shm'' is not specified in ''/etc/fstab'' despite being mounted by default. The following line will implement the recommended ''/dev/shm'' mount options in ''/etc/fstab'':
<code:bash>
tmpfs /dev/shm tmpfs defaults,nodev,nosuid,noexec 0 0
</code>