Re: [PATCH] LSM: add static to security_ops variable

[Greg KH <greg@kroah.com>]

On Sun, Feb 07, 2010 at 07:24:44PM +0800, wzt wzt wrote:
> security_ops was declared as a global variable, so other drivers or
> kernel code can easily change its value, like:
> 
> extern struct security_operations *security_ops;
> security_ops = NULL;
> 
> then insmod this driver immediately, it will get an oops.  Other evil
> drivers can aslo fake this variable as extern.

Evil drivers can do lots of things, if you can load a kernel module on
the system, all bets are off.  Just making this a private variable does
not mean much.

What external module are you trying to keep from using this variable?

thanks,

greg k-h