Overflows Demo

#include

int add(int x,int y)
{
 return x+y;
}

int main(void)
{
 unsigned char buff[256];
 unsigned char *ps = (unsigned char *)&add;
 unsigned char *pd = buff;
 int (*pf)(int, int) = buff;
 int result=0;

 printf("shell:");

 while(1)
 {
  *pd=*ps;
  printf(");
  if(*ps==0xc3)
  {
   break;
  }
  pd++,ps++;
 }
 result=pf(1,5);
 printf("\nresult=%d\n",result);
 return 0;
}