#include <string.h>

#include <stdio.h>

#include <stdlib.h>

/*

  I used as environment the virtual machine provided here

    http://www.cis.upenn.edu/~cis551/box.tar

  This is Debian/Etch with Linux 2.6.18 with gcc 4.1.2 from 2008.

  Some installation notes for this virtual machine under VMWare

  are here

    http://www.cis.upenn.edu/~cis551/project1.pdf

  I run the virtial machine under MacOSX using the program 

  VirtualBox available for free from 

    https://www.virtualbox.org

  The C-program I compiled the program with 

    gcc -ggdb -fno-stack-protector -mpreferred-stack-boundary=2

 */

void foo (char *bar)

{

  long my_long = 10;    // in hex: \xF2\x03\x00\x00

  char  buffer[28];        

  printf("my_long value = %lu\n", my_long);

  strcpy(buffer, bar);  

  printf("my_long value = %lu\n", my_long);

}

int main (int argc, char **argv)

{

  foo("my string is too long !!!!! ");                  // all is normal

  foo("my string is too long !!!!! \x00\x00\x07\xE4");  // overwrites my_long

  return 0;

}