IIRC: this isn't quite correct, there was an extension called XACE that can block this. Probably Xorg didn't implement it and desktops didn't have support for it though.
https://www.x.org/archive/X11R7.5/doc/security/XACE-Spec.htm...
IIRC: this isn't quite correct, there was an extension called XACE that can block this. Probably Xorg didn't implement it and desktops didn't have support for it though.
https://www.x.org/archive/X11R7.5/doc/security/XACE-Spec.htm...