How can a normal user create files owned by another user? If tar allowed that, you could write any file with any permission and any ownership anywhere by first

How can a normal user create files owned by another user? If tar allowed that, you could write any file with any permission and any ownership anywhere by first crafting a tar file of those files and then extracting them. It'd render the file permissions and ownership system completely moot. EDIT: To get the effect you want, run tar as root. That's required to ensure you have the permission to override the DAC system, first.