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Anyone here use assembly? (lemm.ee)

submitted 3 months ago* (last edited 3 months ago) by [email protected] to c/[email protected]

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[–] [email protected] 5 points 3 months ago* (last edited 3 months ago) (1 children)

global _main
    extern  _GetStdHandle@4
    extern  _WriteFile@20
    extern  _ExitProcess@4

    section .text
_main:
    ; DWORD  bytes;    
    mov     ebp, esp
    sub     esp, 4

    ; hStdOut = GetstdHandle( STD_OUTPUT_HANDLE)
    push    -11
    call    _GetStdHandle@4
    mov     ebx, eax    

    ; WriteFile( hstdOut, message, length(message), &bytes, 0);
    push    0
    lea     eax, [ebp-4]
    push    eax
    push    (message_end - message)
    push    message
    push    ebx
    call    _WriteFile@20

    ; ExitProcess(0)
    push    0
    call    _ExitProcess@4

    ; never here
    hlt
message:
    db      '¯\\\_(ツ)\_/¯', 10
message_end:

[–] [email protected] 1 points 3 months ago* (last edited 3 months ago)

Do you want to show us what that looks like in assembly, ASCII from machine code? ...ha, ha, ha, no!

Depends on the device, I know. Such a pain without the higher level languages.

What would it look like for ARM android touch screens? Just for one character...

But if some characters go missing or are exchanged for others for no discernable reason, then might that be an exploit on a EC or assembly level?