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

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Message-ID: <52AAD178.6020607@oracle.com>
Date:	Fri, 13 Dec 2013 10:20:56 +0100
From:	Vegard Nossum <vegard.nossum@...cle.com>
To:	Ryan Mallon <rmallon@...il.com>, 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 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.


Vegard
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