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

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Message-ID: <20101108062916.GA31133@elte.hu>
Date:	Mon, 8 Nov 2010 07:29:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Willy Tarreau <w@....eu>, 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

* Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> > This makes it _unsafe_ (for many types of attackers) to run an exploit locally.
> 
> They don't care.

Sure, script kiddies and botnet builders wont care - i.e. attacks where the 
individual target is low value, or where either the attacker or the attacked is 
stupid.

But it's different when a skilled attacker meets a skilled defense: all the 
exploits/attacks against high-value targets i've seen showed a great deal of care 
taken to avoid detection.

Future trends are also clear: eventually, as more and more of our lives are lived on 
the network, home boxes are becoming more and more valuable. So i think 
concentrating on the psychology of the skilled attacker would not be unwise. YMMV.

Thanks,

	Ingo
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