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

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Message-ID: <20101117061956.GD32484@1wt.eu>
Date:	Wed, 17 Nov 2010 07:19:56 +0100
From:	Willy Tarreau <w@....eu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Kyle Moffett <kyle@...fetthome.net>,
	Marcus Meissner <meissner@...e.de>,
	linux-kernel@...r.kernel.org, tj@...nel.org,
	akpm@...ux-foundation.org, hpa@...or.com, mingo@...e.hu,
	alan@...rguk.ukuu.org.uk
Subject: Re: [PATCH] kernel: make /proc/kallsyms mode 400 to reduce ease of attacking

On Tue, Nov 16, 2010 at 09:58:44PM -0800, Linus Torvalds wrote:
> So I do think that it's worth closing these "small" holes. Anything
> that makes it more work to attack really _is_ improving things.

We must keep in mind that anything which requires more work as root
for common administration opens new holes. I don't think it's the
case for kallsyms, but I mean we should not try to lock too hard,
otherwise everyone will have a sudoers entry to do his work, and
that's even worse than current situation.

Willy

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