1.将/usr权限改回root：chown -R root:root /usr
sudo后：显示sudo: effective uid is not 0, is sudo installed setuid root?
执行命令 chmod 4755 /usr/bin/sudo
sudo后：
sudo: /usr/libexec/sudoers.so must be only be writable by owner
sudo: fatal error, unable to load plugins
执行：chmod 644 /usr/libexec/sudoers.so
chmod 644 /usr/libexec/sudo_noexec.so
ok！！
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