Studying buffer overflows [maybe OT]

[darko <darko () autistici org>]

Hi all,

I've started to study buffer overflows. I wrote the following code:

void f() {
        char a[4];
        int *b;
        b =  a + 0x8;
        (*b) += 0x8;
}

main() {
        int x;
        x = 0;
        f();
        x = 1;
        printf("%d\n", x);
}

I want, after the call to f(), the program jump to printf() so the value of x 
should remain 0, not 1. I always get segmentation faults, bus errors, etc. 
and never that fuc*ing "x = 0" !!
Tested on a Celeron 433, red hat 7.2, gcc 2.96.

byez
darko