Edit your /etc/fstab:

`

vi /etc/fstab

`

change:

none /dev/shm tmpfs defaults,rw 0 0

to

none /dev/shm tmpfs defaults,nosuid,noexec,rw 0 0

Remount /dev/shm:

`

mount -o remount /dev/shm

`

You can test it runnig a script on /dev/shm, if you get “permission denied” it is fine!