(Collaborative post by Mateusz ‘j00ru’ Jurczyk & Gynvael Coldwind)
Early Sunday morning discussion has resulted in j00ru coming up with an idea to mitigate some variants of kernel exploitation techniques by introducing a CPU feature that would disallow execution control transfers in kernel-mode to code residing in user memory area pages (e.g. addresses < 0×80000000 on a 32-bit Windows with default settings) [...]

http://j00ru.vexillium.org/?p=783