problem in hacking sys_call_table
 

I have a problem in tracking the sys_exit function. I am able to install the below
module successfully but not able to intercept the syscalls. Can anyone point out the problem
in the below code.


void * hack_sys_call_table[] ;
asmlinkage int (*original_sys_exit)(int errorcode);
asmlinkage int our_fake_exit_function(int error_code)
{
/** process and then call original sys exit *******/
}


int init_module()
{
*(long *) &hack_sys_call_table = (long) 0xc032f974;
/**** c032f974 is the address of sys_call_table obtained from System.Map ****/
original_sys_exit=hack_sys_call_table[__NR_exit];
hack_sys_call_table[__NR_exit]=our_fake_exit_function;
return 0;
}

*(long *) &hack_sys_call_table = (long) 0xc032f974;

uhh, no.