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

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Date:	Sun, 7 Nov 2010 13:55:31 +0100
From:	Willy Tarreau <w@....eu>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Marcus Meissner <meissner@...e.de>, security@...nel.org,
	mort@....com, Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	fweisbec@...il.com, "H. Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org, jason.wessel@...driver.com,
	tj@...nel.org, Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Security] [PATCH] kernel: make /proc/kallsyms mode 400 to reduce ease of attacking

On Sun, Nov 07, 2010 at 01:37:46PM +0100, Ingo Molnar wrote:
> > [...] There's no need for that, what you want is to hide kernel pointers, [...]
> 
> That's a new claim from you - and when put like that it's wrong too:

It's where the discussion started and it's still in the subject of the thread !
You noted that with distro kernels, hiding kallsyms is useless since uname -r
reveals what kernel to download to get them anyway. Which is true !

Reason why it would be more efficient to find how we could randomize those
pointers at runtime.

(...)
> Anyway, i wasnt particularly successful in conveying my past arguments to you so i'd 
> rather leave the discussion at this point. You made your points and i made my points 
> as well.

That's also what I was about to say. Let's agree we disagree and have a
nice sunday afternoon. We can bring the discussion back around a beer if
you happen to pass by Paris :-)

Cheers,
Willy

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