Get the Whitepaper called Exploiting the otherwise non-exploitable – Windows Kernel-mode GS Cookies subverted.
You can download it from the following link: https://packetstormsecurity.com/files/download/97483/Windows_Kernel-mode_OS_Cookies_subverted.pdf
Source: https://packetstormsecurity.com/files/97483/Exploiting-The-Otherwise-Non-Exploitable.html