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-------------------------- xinsmod.c -----------------------------

/*
Donz Anto mixes C code!
Tested in Linux node0 2.6.20-17-generic #2 SMP
cat /boot/System.map-2.6.20-17-generic |grep sys_call_ta
c02f4500 R sys_call_table
*/

#include <linux/module.h> 
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h> 
#include <linux/init.h> 
#include <linux/unistd.h> 
#include <linux/syscalls.h>
#include <asm/uaccess.h>

int lock=1;
void **sys_call_table = (void *)0xc02f4500;
asmlinkage int (*o_unlink) (const char *pathname); 
asmlinkage int (*o_init) (void *umod,unsigned long len,char *uargs);

asmlinkage int my_unlink(const char *pathname) 
{
	char *pass="unl0ck3d";
	char *locked="kunci";
	char *kname=(char *)kmalloc(256,GFP_KERNEL); 
	int ret;	

	copy_from_user(kname,pathname,255);

	if(strcmp(kname,pass)==0){
		lock=0;
		printk(KERN_INFO "SYS_UNLINK  : init_module successfully unlocked\n");
		kfree(kname);
		return 0;
	}
	else if(strcmp(kname,locked)==0){
		lock=1;
		printk(KERN_INFO "SYS_UNLINK  : init_module successfully locked\n");
		kfree(kname);
		return 0;
	}else{
		kfree(kname);
		ret=o_unlink(pathname);
		
	}
	return ret;
} 

asmlinkage int my_init(void *umod,unsigned long len,char *uargs)
{
	int ret;
	if(lock==1){
		printk(KERN_INFO "SYS_INIT_MODULE : module loading denied!\n");
		return 0;
	}else{
		ret=o_init(umod,len,uargs);
		printk(KERN_INFO "SYS_INIT_MODULE : module loaded successfully\n");
		return ret;
	}
	return ret;
}

int init_module(void)
{
    o_unlink=sys_call_table[__NR_unlink];
    sys_call_table[__NR_unlink]=my_unlink;
    o_init=sys_call_table[__NR_init_module];
    sys_call_table[__NR_init_module]=my_init;
    return 0;
}

/* permanent module untill rebooted
   cleanup_module's disabled

void cleanup_module(void)
{
    sys_call_table[__NR_unlink]=o_unlink; 
    sys_call_table[__NR_init_module]=o_init;
}

*/


--------------------------- unlock.c ---------------------------

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
 if(argc!=3){
   printf(" Usage : %s [-l|-u] <junk>\n -u to unlock and -l to lock\n",argv[0]);
   exit(0);
 }
 char sw,*pwd;
 while((sw=getopt(argc,argv,"u:l"))!=EOF){
   switch(sw)
   {
     case 'u' :
	printf("Enter secret code to unlock init_module\n");
	pwd = getpass("password : ");
	unlink(pwd);
	break;
     case 'l' :
	unlink("kunci");
	break;
     default :
	printf("Unsupported option\n");
	break;
   }
 }
}


------------------------- Makefile ----------------------------

obj-m += xinsmod.o
CC=cc

all:
	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
	$(CC) -o unlock unlock.c

clean:
	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
	rm -f unlock


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end