Kontrollierter Buffer Overflow

void function() {
 char buffer1[5];
 int *ret;

 ret = buffer1 + 12;
 (*ret) += 15; 
}

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

0x080483a2 <main+0>: push %ebp
0x080483a3 <main+1>: mov %esp,%ebp
0x080483a5 <main+3>: sub $0x18,%esp
0x080483a8 <main+6>: and $0xfffffff0,%esp
0x080483ab <main+9>: mov $0x0,%eax
0x080483b0 <main+14>: sub %eax,%esp
0x080483b2 <main+16>: movl $0x0,0xfffffffc(%ebp)
0x080483b9 <main+23>: call 0x8048384 <function>
0x080483be <main+28>: movl $0x1,0xfffffffc(%ebp)
0x080483c5 <main+35>: mov 0xfffffffc(%ebp),%eax
0x080483c8 <main+38>: mov %eax,0x4(%esp)
0x080483cc <main+42>: movl $0x80484f4,(%esp)
0x080483d3 <main+49>: call 0x80482b0 <_init+56>
0x080483d8 <main+54>: leave
0x080483d9 <main+55>: ret
0x080483da <main+56>: nop
0x080483db <main+57>: nop
0x080483dc <main+58>: nop
0x080483dd <main+59>: nop
0x080483de <main+60>: nop
0x080483df <main+61>: nop