WinDriver - DOS style "security" for Linux
I have read about WinDriver in the Linux Magazin, a german magazine. It is indeed the crudest possible way to acess hardware: A kernel module which gives user mode processes low-level access to any device on the computer - just like DOS. A machine running driver software developed with WinDriver can be rooted by any user. Of course, this applies to the Windows version of WinDriver too.
The article in the Linux Magazin does mention how to recognize driver software developed with WinDriver - it comes with a kernel module named something like windrv (I don't have the magazine at hand now, so I can't give more details)