linux-kernel - Re: NULL pointer dereference in selinux_ip_postroute

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Date:	Tue, 07 Aug 2012 14:58:22 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	Paul Moore <paul@...l-moore.com>
CC:	lkml <linux-kernel@...r.kernel.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	James Morris <james.l.morris@...cle.com>, selinux@...ho.nsa.gov
Subject: Re: NULL pointer dereference in selinux_ip_postroute_compat

On 08/07/2012 02:50 PM, Paul Moore wrote:
> On Tue, Aug 7, 2012 at 2:12 PM, John Stultz <john.stultz@...aro.org> wrote:
>> Hi,
>>      With my kvm environment using 3.6-rc1+, I'm seeing NULL pointer
>> dereferences in selinux_ip_postroute_compat(). It looks like the sksec value
>> is null and we die in the following line:
>>
>>      if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto))
>>
>> This triggers every time I shutdown the machine, but has also triggered
>> randomly after a few hours.
>>
>> This is on an ubuntu 12.04 image, not using selinux.
> NOTE: Adding the SELinux list to the CC line
Thanks!

>
> Hi,
>
> I'm trying to understand this and I was hoping you could you clarify a
> few things for me:
>
> * Is the panic in the Ubuntu 12.04 guest, or the host?  If the host,
> could you share what distribution you are using?
Sorry, its a 12.04 guest.  I think the host is Ubuntu 12.04 as well.

> * When you say you are not using SELinux, could you be more specific?
> It seems odd that you are not using SELinux but the panic is happening
> in a SELinux hook.
I just mean that, being Ubuntu,  the system (userland) isn't configured 
to use selinux.  SELinux is just enabled in the kernel config.

thanks
-john

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