Stuff

insmod overlayfs
mkdir -p /tmp/overlay /tmp/new-root
mount -n -t tmpfs none /tmp/overlay
mount -t overlayfs -olowerdir=/,upperdir=/tmp/overlay overlay:/tmp/overlay /tmp/new-root
mkdir -p /tmp/new-root/rom
mount --move /sys /tmp/new-root/sys
mount --move /dev /tmp/new-root/dev
mount --move /proc /tmp/new-root/proc
pivot_root /tmp/new-root /tmp/new-root/rom
mount --move /rom/tmp /tmp