Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756874Ab2HGWBk (ORCPT ); Tue, 7 Aug 2012 18:01:40 -0400 Received: from mail-qc0-f174.google.com ([209.85.216.174]:49336 "EHLO mail-qc0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753600Ab2HGWBj (ORCPT ); Tue, 7 Aug 2012 18:01:39 -0400 MIME-Version: 1.0 X-Originating-IP: [76.119.162.148] In-Reply-To: <50218F7E.1060004@linaro.org> References: <50215A7E.8000701@linaro.org> <50218F7E.1060004@linaro.org> Date: Tue, 7 Aug 2012 18:01:38 -0400 Message-ID: Subject: Re: NULL pointer dereference in selinux_ip_postroute_compat From: Paul Moore To: John Stultz Cc: lkml , "Serge E. Hallyn" , James Morris , selinux@tycho.nsa.gov Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1840 Lines: 53 On Tue, Aug 7, 2012 at 5:58 PM, John Stultz wrote: > On 08/07/2012 02:50 PM, Paul Moore wrote: >> >> On Tue, Aug 7, 2012 at 2:12 PM, John Stultz >> 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 for the quick response, I'll setup an Ubuntu guest and see if I can reproduce this ... something is odd. Anything non-standard about your guest install or anything else you think might be helpful? -- paul moore www.paul-moore.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/