Cannot login: Failed to start Login Service

I found out that after changing /etc/passwd it didn't have the right SELinux settings anymore. I don't really need SELinux on my machine so I solved the problem by disabling SELinux altogether. This is easily done by modifying the file /etc/selinux/config and setting the option SELINUX=permissive (if you want to keep SELinux file labeling to enable it later) or SELINUX=disabled (turning it off completely).