Fix `sudoers` issue on macOS Catalina

fix-sudoers-issue-on-macos-catalina.md

Fix sudoers Issue on macOS Catalina

If you messed up with editing sudoers, this solution is for you. The solution is limited to restoring /etc/sudoers file to the original state. It is easier to mess up your config such as saving wrong format, etc.

How to Fix

• Please reboot your macOS into recovery mode. While rebooting press and hold Cmd+R key.
• After you completely reboot, you will see a dialog. You need to open Terminal by clicking Utilities > Terminal on menu.
• In order to mount /etc as writable state, you need to disable SIP first by executing csrutil disable.
• Reboot into single user mode. While rebooting press and hold Cmd+S key.
• Mount /etc as writable state by executing mount -uw /System/Volumes/Data.
• Make sure /etc/sudoers file and /etc/sudoers.d folder ownership is set to root. If not, execute chown root:wheel /etc/sudoers and chown root:wheel /etc/sudoers.d.
• Make sure there is no /etc/sudoers~. If yes, please delete it.
• Under /etc/sudoers.d directory, delete all files if needed.
• Reboot into recovery mode to enable SIP. In terminal execute csrutil enable.
• Finally reboot into normal mode.