To secure /dev/shm look for the mount line for /dev/shm in /etc/fstab and change it to the following:
none /dev/shm tmpfs noexec,nosuid 0 0
Umount and remount /dev/shm for the changes to take effect.
-----command-----
#umount /dev/shm
#mount /dev/shm
#ipcs | awk '/^0x000000/ && /nobody/ {print $2}' | xargs -n1 ipcrm -s
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