InformationThe nosuid mount option specifies that the filesystem cannot contain setuid files.
Since the /tmp filesystem is only intended for temporary file storage, set this option to ensure that users cannot create setuid files in /tmp.
SolutionIf /etc/fstab is used to mount /tmp
Edit the /etc/fstab file and add nosuid to the fourth field (mounting options) for the /tmp partition. See the fstab(5) manual page for more information.
Run the following command to remount /tmp :
# mount -o remount,nosuid /tmp
If an explicit systemd target is used to mount /tmp:
Edit /etc/systemd/system/local-fs.target.wants/tmp.mount to add nosuid to the /tmp mount options:
Run the following command to restart the systemd daemon:
# systemctl daemon-reload
Run the following command to restart tmp.mount:
# systemctl restart tmp.mount
These remediation steps are based on following the remediation guidance in item 1.1.2.
If a different file name was used that name should replace tmp.mount in the path /etc/systemd/system/local-fs.target.wants/tmp.mount
The contents of /etc/systemd/system/local-fs.target.wants should exist as a symlink to the file created in /etc/systemd/system.
If the path /etc/systemd/system/local-fs.target.wants/tmp.mount does not exist this could indicate that the remediation steps from 1.1.2 were not completed successfully.