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#include
#include
#include
#include
#include
#include
#include
#include
#include
MODULE_LICENSE("GPL");
extern void* sys_call_table[]; /*sys_call_table is exported, so we can accessit. But in some system this will cause problem */
int (*orig_mkdir)(const char *path); /*the original systemcall*/
int hacked_mkdir(const char *path)
{
        return 0; /*everything is ok, but he new systemcall   does nothing*/
}
int init_module(void) /*module setup*/
{
        orig_mkdir=sys_call_table[SYS_mkdir];
        sys_call_table[SYS_mkdir]=hacked_mkdir;
        return 0;
}
void cleanup_module(void) /*module shutdown*/
{
        sys_call_table[SYS_mkdir]=orig_mkdir;
/*set mkdir syscall to the origal  one*/
}
ÓÃÕâÖÖ·½·¨ÊµÏÖϵͳµ÷ÓÃÓиöÇ°Ìᣬ¾ÍÊÇϵͳ±ØÐëµ¼³ösys_call_tableÄں˷ûºÅ£¬µ«ÊÇÔÚ2.6Äں˺ÍÓÐЩ2.4Äں˵Äϵͳ£¨±ÈÈç
redhat as 3£©ÖУ¬sys_call_table²»ÔÙµ¼³ö¡£Ò²¾ÍÊÇ˵ģ¿éÖв»ÄÜÔÙͨ¹ý¼òµ¥µÄextern void
*sys_call_table[];À´»ñµÃϵͳµ÷ÓñíµØÖ·¡£ËùÐÒµÄÊÇ£¬¼´Ê¹Äں˲»µ¼³ösys_call_table£¬Ò²¿ÉÒÔÔÚÄÚ´æÖÐÕÒµ½ËüµÄµØÖ·£¬ÏÂÃæ
ÊÇËüµÄʵÏÖ·½·¨£º
Ä£¿é¶þ£º(2.4ºÍ2.6Äں˲âÊÔͨ¹ý)
#include
#include
#include
#include
#include
MODULE_LICENSE("GPL");
MODULE_AUTHOR("
[email=xunil@bmy]xunil@bmy[/email]
");
MODULE_DESCRIPTION("Different from others, this module  automatically locate the entry of
sys_call_table !");
unsigned long *sys_call_table=NULL;
asmlinkage int (*orig_mkdir)(const char *,int);
struct _idt
{
  unsigned short offset_low,segment_sel;
  unsigned char reserved,flags;
  unsigned short offset_high;
};
unsigned long *getscTable(){
 


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