This whitepaper discusses five creative methods used to overcome various stack protection patches. It focuses on the VA (Virtual Address) space randomization patch that has been integrated into the Linux 2.6 kernel. These methods are not limited to this patch, but rather provide a different approach to the buffer overflow exploiting scheme.
You can download it from the following link: https://packetstormsecurity.com/files/download/40513/smackthestack.txt
Source: https://packetstormsecurity.com/files/40513/smackthestack.txt.html