centos7.5 sudo: fatal error, unable to load plugins。修改usr权限后sudo命令无法使用问题

报错：

[appgroup@host etc]$ sudo su - app
sudo: error in /etc/sudo.conf, line 19 while loading plugin "sudoers_policy"
sudo: /usr/libexec/sudo/sudoers.so must be only be writable by owner
sudo: fatal error, unable to load plugins

 解决办法:

chmod 644 /usr/libexec/sudo/sudoers.so

chmod 644 /usr/libexec/sudo/sudo_noexec.so