This guide intends to teach the basics of buffer overflow to the average C programmer without the need for complex knowledge of assembly. Written with FreeBSD 4.2-Release in mind, but written for x86 *nix.
You can download it from the following link: https://packetstormsecurity.com/files/download/24496/Overflows.txt
Source: https://packetstormsecurity.com/files/24496/Overflows.txt.html