Fedora Security :: Carrying Out A Simple Buffer Overflow?

I would like to start learning about the nuts and bolts concerning Linux security. I bought the "Gray Hat Hacking" book by Harris et al. and started working at their example for buffer overflows but hit a bump immediately. Is this the right place to be discussing this sort of thing? If so I give pertinent info below:

Program:
//overflow.c
#include <string.h>
main(){
char str1[10]; //declare a 10 byte string

[Code].....