Prevent segmentation fault in buffer overflow demonstration in Ubuntu 12

Question

I am trying to run this piece of vulnerable C code:

#include <stdio.h>
#include <stdlib.h>

int add(int x, int y)
{
 int z =10;
 z = x + y;
 return z;
}

main(int argc, char **argv)
{
 int a = atoi(argv[1]);
 int b = atoi(argv[2]);
 int c;

 char buffer[100];

 gets(buffer);
 puts(buffer);

 c = add(a,b);

 printf("Sum of %d+%d = %d\n",a, b, c);

 exit(0);
}

I am trying to get past the segmentation fault so that I can input the integers but the segmentation fault prevents that. In the terminal I have tried:

I still get a segmentation fault. I am lost as to what to try next. As you can probably tell, I am an ubuntu newb. The bash code I am using comes from here:

http://www.evanjones.ca/buffer-overflow-101.html

I have been at this for while so would really appreciate some help

Cheers

Answer 1

Just explaining what hmjd is asking you to do.

Run (binary) 10 20