1. Determine the ebp value for main, the caller of getbuf.

2. Determine the beginning address of the character array buf
   in getbuf that will be loaded and that will overflow and overwrite
   getbuf's stack frame.

3. Determine the byte code for our attack function.

4. Build the input string as this byte code plus padding bytes if
   necessary plus main's ebp plus the beginning address of our code
   (i.e., the beginning address of the character array).