linux-kernel - Re: [PATCH] LSM: add static to security

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Message-ID: <b6fcc0a1002190344s75ecfcf6y625591a0fa8e9869@mail.gmail.com>
Date:	Fri, 19 Feb 2010 13:44:46 +0200
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	wzt wzt <wzt.wzt@...il.com>
Cc:	linux-kernel@...r.kernel.org, sds@...ho.nsa.gov, jmorris@...ei.org,
	eparis@...isplace.org
Subject: Re: [PATCH] LSM: add static to security_ops variable

On Sun, Feb 7, 2010 at 1:24 PM, wzt wzt <wzt.wzt@...il.com> wrote:
> security_ops was declared as a global variable, so other drivers or
> kernel code can easily change its value, like:

With your patch they still can.

> 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.
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