Simply do this :
# mount -t tmpfs -o noexec,nosuid tmpfs /tmp/
# cat /proc/mounts
simfs / simfs rw 0 0
proc /proc proc rw 0 0
sysfs /sys sysfs rw 0 0
devpts /dev/pts devpts rw 0 0
tmpfs /dev/shm tmpfs rw 0 0
tmpfs /tmp tmpfs rw,nosuid,noexec 0 0
and dont forget to insert to /etc/fstab :
tmpfs /tmp tmpfs noexec,nosuid 0 0
tmpfs /var/tmp tmpfs noexec,nosuid 0 0
