I am running Debian 9.5 on my machine and when I run the command
xhost there is the following output:
access control enabled, only authorized clients can connect SI:localuser:username
So in my understanding root should not be allowed to access the x-server but when I switch to root with
su and run a GUI application from the terminal, everything runs fine although it shouldn't.
So can someone explain why my x-server ignores the entries in the access control list?