From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Ahern Subject: Re: Network hang after c3f1010b30f7fc611139cfb702a8685741aa6827 with CIPSO & Smack Date: Wed, 6 Jul 2016 10:40:20 -0700 Message-ID: <9cb32128-176b-85cf-8ea8-465704f667e7@cumulusnetworks.com> References: <7d833f59-c68f-f779-4de4-15bc0b26ac7c@cumulusnetworks.com> <66709b13-15a7-8d03-9e84-e4be9aab60b5@schaufler-ca.com> <9998a0da-b273-43d4-84ad-a0539e6a69ac@cumulusnetworks.com> <5de95a23-fd64-d911-d4b0-88de51ab12a4@schaufler-ca.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Cc: Linux-Netdev To: Casey Schaufler , David Miller , Paul Moore Return-path: Received: from mail-pa0-f45.google.com ([209.85.220.45]:34761 "EHLO mail-pa0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754692AbcGFRkX (ORCPT ); Wed, 6 Jul 2016 13:40:23 -0400 Received: by mail-pa0-f45.google.com with SMTP id bz2so78336392pad.1 for ; Wed, 06 Jul 2016 10:40:22 -0700 (PDT) In-Reply-To: <5de95a23-fd64-d911-d4b0-88de51ab12a4@schaufler-ca.com> Sender: netdev-owner@vger.kernel.org List-ID: On 7/6/16 10:24 AM, Casey Schaufler wrote: > On 7/6/2016 9:28 AM, David Ahern wrote: >> On 7/5/16 6:31 PM, Casey Schaufler wrote: >>> On 7/5/2016 5:49 PM, David Ahern wrote: >>>> On 7/5/16 5:38 PM, Casey Schaufler wrote: >>>>> I have encountered a system hang with my Smack >>>>> networking tests that bisects to the change below. >>>>> I can't say that I have any idea why the change >>>>> would impact the Smack processing, but there appears >>>>> to be some serious packet processing going on. The >>>>> Smack code is using CIPSO on the loopback interface. >>>>> The test is supposed to verify that labels can be >>>>> set on the packets using CIPSO. Unlabeled packets >>>>> do not appear to be impacted. I do not know if SELinux >>>>> is affected, and if not, why not. Smack and SELinux >>>>> use CIPSO differently. >>>> >>>> What are the commands to repeat the test? >>>> >>> There is a tar file attached with the tests. >>> Put the etc/smack/user file into /etc/smack/user. >>> In the tools-2012 directory run make to build >>> the tools. The test in question is called >>> testnetworking.sh and needs to be run as root. >>> You will need to configure Smack in the kernel, >>> of course. >>> >> >> I understand Paul's point and glad to see the changes are not causing issues with his SELinux testing. >> >> I have tried to reproduce the lockup you are seeing but not successful. I am using a jessie based VM with latest net-next kernel. >> >> root@kenny-jessie3:~/smack/tools-2012# zcat /proc/config.gz | grep SMACK >> CONFIG_SECURITY_SMACK=y >> CONFIG_SECURITY_SMACK_BRINGUP=y >> CONFIG_SECURITY_SMACK_NETFILTER=y >> # CONFIG_DEFAULT_SECURITY_SMACK is not set > > CONFIG_DEFAULT_SECURITY_SMACK needs to be set. ok. That caused more interesting output but still no hang after all of the snap-crackle-and-pops.