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

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Message-ID: <b6fcc0a1002190402y7aeef6bana21ad7d54a32777a@mail.gmail.com>
Date:	Fri, 19 Feb 2010 14:02:27 +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 Fri, Feb 19, 2010 at 1:57 PM, wzt wzt <wzt.wzt@...il.com> wrote:
> Maybe, but The attackers will use a complicated way to find the
> security_ops address, it's a barrier to attackers.

It's not a barrier, it's garbage. Once you know the adress security_ops
ended up at, you simply write to it.

> LSM is security framework,  we don't want the attackers can easily
> to break it.

LSM doesn't protect kernel from kernel.

> Just like the sys_call_table variable in kernel 2.4.x(global and
> writeable), evil drivers can extern the variable,  then replace the
> Sys_X functions.

Not that easily, but they still can.
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