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

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Message-ID: <4CF4012E.3040901@zytor.com>
Date:	Mon, 29 Nov 2010 11:38:22 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Eric Paris <eparis@...isplace.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Marcus Meissner <meissner@...e.de>,
	linux-kernel@...r.kernel.org, tj@...nel.org,
	akpm@...ux-foundation.org, w@....eu, alan@...rguk.ukuu.org.uk,
	serue@...ibm.com, LSM List <linux-security-module@...r.kernel.org>,
	James Morris <jmorris@...ei.org>
Subject: Re: [PATCH] kernel: make /proc/kallsyms mode 400 to reduce ease of
 attacking

On 11/29/2010 11:21 AM, Eric Paris wrote:
>>
>> Delegating CAP_SYS_ADMIN, of course, otherwise known as "everything", is
>> worse than anything...
> 
> Serge just proposed a new CAP_SYSLOG
> 
> http://lwn.net/Articles/378472/
> 
> Which could probably still be renamed and used to cover this access as well....
> 

Quite frankly, the Linux capability system is largely a mess, with big
bundled capacities that don't make much sense and are hideously
inconvenient with the capability system used in user space (groups).
For things like this that genuinely has a file node, *let's use it* and
allow permissions to be controlled by the file node!

	-hpa
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