linux-kernel - Re: [PATCH 1/9] Known exploit detection

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Message-ID: <52AB8F02.6030101@gmail.com>
Date:	Sat, 14 Dec 2013 09:49:38 +1100
From:	Ryan Mallon <rmallon@...il.com>
To:	Vegard Nossum <vegard.nossum@...cle.com>
CC:	Kees Cook <keescook@...omium.org>, Theodore Ts'o <tytso@....edu>,
	LKML <linux-kernel@...r.kernel.org>,
	Tommi Rantala <tt.rantala@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andy Lutomirski <luto@...capital.net>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Alan Cox <alan@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jason Wang <jasowang@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	James Morris <james.l.morris@...cle.com>
Subject: Re: [PATCH 1/9] Known exploit detection

On 13/12/13 20:20, Vegard Nossum wrote:

> On 12/13/2013 12:50 AM, Ryan Mallon wrote:
>> On 13/12/13 08:13, Kees Cook wrote:
>>> On Thu, Dec 12, 2013 at 11:06 AM, Theodore Ts'o <tytso@....edu> wrote:
>>>> On Thu, Dec 12, 2013 at 05:52:24PM +0100, vegard.nossum@...cle.com wrote:
>>>>> The idea is simple -- since different kernel versions are vulnerable to
>>>>> different root exploits, hackers most likely try multiple exploits before
>>>>> they actually succeed.
>>
>> The _exploit() notifications could also be used to spam the syslogs.
>> Although they are individually ratelimited, if there are enough
>> _exploit() markers in the kernel then an annoying person can cycle
>> through them all to generate large amounts of useless syslog.
> 
> They are rate limited collectively, not individually, so this should not be an issue.


Yes, sorry, I misread the code.

I wonder if the exploit() function name should be changed though. Having:

	exploit("CVE-xxxx");

In the code looks like some sort of injection/testing framework. Maybe:

	warn_known_exploit("CVE-xxxx");

would be clearer?

~Ryan

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