Level 1 - Server Level 1 - Workstation
The noexec mount option specifies that the filesystem cannot contain executable binaries.
Since the /tmp filesystem is only intended for temporary file storage, set this option to ensure that users cannot run executable binaries from /tmp.
If a /tmp partition exists run the following command and verify that the noexec option is set on /tmp:
# mount | grep /tmp tmpfs on /tmp type tmpfs (rw,nosuid,nodev,noexec,relatime)
Edit /etc/systemd/system/local-fs.target.wants/tmp.mount to add noexec to the /tmp mount options:
[Mount] Options=mode=1777,strictatime,noexec,nodev,nosuid
Run the following command to remount /tmp:
# mount -o remount,noexec /tmp
systemd includes the tmp.mount service which should be used instead of configuring /etc/fstab. Mounting options are configured in the Options setting in /etc/systemd/system/tmp.mount.