linux-kernel - Re: [PATCH] kernel: make /proc/kallsyms mode 400 to reduce ease of attacking

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Message-ID: <4CD2C7AF.8020906@kernel.org>
Date:	Thu, 04 Nov 2010 15:48:15 +0100
From:	Tejun Heo <tj@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Marcus Meissner <meissner@...e.de>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, jason.wessel@...driver.com,
	fweisbec@...il.com, mort@....com, akpm@...l.org,
	security@...nel.org, Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] kernel: make /proc/kallsyms mode 400 to reduce ease of
 attacking

Hello,

On 11/04/2010 03:43 PM, H. Peter Anvin wrote:
>> We already have relocatable kernel for kdump and IIRC it doesn't add
>> runtime overhead, so putting the kernel at random address shouldn't be
>> too difficult.  Not sure how useful that would be tho.
> 
> It's very coarse-grained relocation, which is why it works.

Yeah, I recall reading the fairly simple relocator somewhere in the
x86 tree.  Would it be impossible/difficult to improve it?

> P.S. It's not just for kdump anymore.

Ah, didn't know that either.

Thanks.

-- 
tejun
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