Let's talk about the elephant in the room.

This is quite obviously the NSA adding massive additional attackable surface area to the Linux kernel.

They did it to SSL/TLS, they did it to many others, they are now doing it in earnest to Linux.

First systemd, now kdbus. Keep this up and OpenBSD, or something else, is going to kill the Swiss cheese that Linux is becoming. I love Linux, so it is sad to see this happening.