mkdir /tmp/tmproot
mount -t tmpfs none /tmp/tmproot
mkdir /tmp/tmproot/{bin,sbin,proc,sys,dev,run,usr,var,tmp,etc,root,oldroot}
mkdir -p /tmp/tmproot/usr/bin
mkdir -p /tmp/tmproot/dev/pts
mkdir -p /tmp/tmproot/lib/x86_64-linux-gnu /tmp/tmproot/lib64 /tmp/tmproot/usr/share /tmp/tmproot/usr/lib/x86_64-linux-gnu /tmp/tmproot/var/run/screen

#tmux
cp -vrp /usr/share/terminfo /tmp/tmproot/usr/share/
cp -vrp /usr/lib/x86_64-linux-gnu/libevent* /tmp/tmproot/usr/lib/x86_64-linux-gnu/
cp -vrp /lib/x86_64-linux-gnu/* /tmp/tmproot/lib/x86_64-linux-gnu/
cp -vrp /lib64/ld-linux-x86-64.so.2 /tmp/tmproot/lib64/
cp -vrp /sbin/* /tmp/tmproot/sbin/
cp -vrp /bin/* /tmp/tmproot/bin/
cp -vrp /usr/bin/shred /usr/bin/ldd /usr/bin/screen /usr/bin/tmux /tmp/tmproot/usr/bin/

#cp -a /dev/zero /dev/random /dev/sda /tmp/tmproot/dev/
cp -a /dev/* /tmp/tmproot/dev/

mount -t proc proc /tmp/tmproot/proc
mount --bind /dev/pts /tmp/tmproot/dev/pts
chmod g+w /tmp/tmproot/run 
chmod a+x /tmp/tmproot/tmp

apt-get install -y dropbear
cp /usr/sbin/dropbear /tmp/tmproot/sbin/
#cp -vrp /etc/dropbear /tmp/tmproot/etc/
#cp -vrp /etc/passwd* /etc/shadow* /etc/group* /etc/shells /tmp/tmproot/etc/
cp -vrp /etc/* /tmp/tmproot/etc/
echo "" > /root/.bash_history
echo "TERM=xterm-16color" >>.profile
mount --make-rprivate / # necessary for pivot_root to work
pivot_root /tmp/tmproot /tmp/tmproot/oldroot
/sbin/dropbear -p 666

ssh -p 666 root@host

tmux -s shred
#shred -z -v /dev/sda

ssh -p 666 root@host
#tmux a -t shred
#echo "o" > /proc/sysrq-trigger