; run /bin/sh and normal exit
; author @cocomelonc
; nasm -f elf32 -o example3.o example3.asm
; ld -m elf_i386 -o example3 example3.o && ./example3
; 32-bit linux

section .bss

section .text
  global _start   ; must be declared for linker

_start:           ; linker entry point

  ; xoring anything with itself clears itself:
  xor eax, eax    ; zero out eax
  xor ebx, ebx    ; zero out ebx
  xor ecx, ecx    ; zero out ecx
  xor edx, edx    ; zero out edx

  push eax        ; string terminator
  push 0x68732f6e ; "hs/n"
  push 0x69622f2f ; "ib//"
  mov ebx, esp    ; "//bin/sh",0 pointer is ESP
  mov al, 0xb     ; mov eax, 11: execve
  int 0x80        ; syscall