Accidently changed access to all folders

[railrash]

I've broke my system. What i did is:
$ sudo find /. f -print0 | xargs -0 sudo chmod 0644
sudo: unable to execute /usr/bin/chmod: Argument list too long
sudo: unable to execute /usr/bin/chmod: Argument list too long
sudo: unable to execute /usr/bin/chmod: Argument list too long
sudo: unable to execute /usr/bin/chmod: Argument list too long
chmod: changing permissions of '/./sys/fs/cgroup': Read-only file system
xargs: sudo: Permission denied

So i think problem is that all folders now lost +X access

Now i cant use it. Even cant start recovery. What can i do to fix it ?

Thanks