Get the Whitepaper called Kernel Exploitation 4: Stack Buffer Overflow (SMEP Bypass).
You can download it from the following link: https://packetstormsecurity.com/files/download/145985/4-stack-buffer-overflow.pdf
Source: https://packetstormsecurity.com/files/145985/Kernel-Exploitation-Part-4-Stack-Buffer-Overflow-SMEP-Bypass.html