centos修改了bin文件权限导致无法登入root用户

Question

为了安装eclipse我手动修改了usr（如下）中所有文件的权限为777

现在su root提示su: Authentication failure；sudo提示sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set
centos开机又不能进入root终端，请问怎么解决？