linux-kernel - Re: WARNING in apparmor_secid_to

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Message-ID: <4b37e892-4d79-aefb-92ab-7753b89b8963@tycho.nsa.gov>
Date:   Fri, 31 Aug 2018 12:17:49 -0400
From:   Stephen Smalley <sds@...ho.nsa.gov>
To:     Paul Moore <paul@...l-moore.com>, dvyukov@...gle.com
Cc:     syzbot+21016130b0580a9de3b5@...kaller.appspotmail.com,
        tyhicks@...onical.com, john.johansen@...onical.com,
        James Morris <jmorris@...ei.org>, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Serge Hallyn <serge@...lyn.com>,
        syzkaller-bugs@...glegroups.com,
        Jeffrey Vander Stoep <jeffv@...gle.com>
Subject: Re: WARNING in apparmor_secid_to_secctx

On 08/31/2018 12:16 PM, Stephen Smalley wrote:
> On 08/31/2018 12:07 PM, Paul Moore wrote:
>> On Fri, Aug 31, 2018 at 12:01 PM Stephen Smalley <sds@...ho.nsa.gov> 
>> wrote:
>>> On 08/29/2018 10:21 PM, Dmitry Vyukov wrote:
>>>> On Wed, Aug 29, 2018 at 7:17 PM, syzbot
>>>> <syzbot+21016130b0580a9de3b5@...kaller.appspotmail.com> wrote:
>>>>> Hello,
>>>>>
>>>>> syzbot found the following crash on:
>>>>>
>>>>> HEAD commit:    817e60a7a2bb Merge branch 'nfp-add-NFP5000-support'
>>>>> git tree:       net-next
>>>>> console output: 
>>>>> https://syzkaller.appspot.com/x/log.txt?x=1536d296400000
>>>>> kernel config:  
>>>>> https://syzkaller.appspot.com/x/.config?x=531a917630d2a492
>>>>> dashboard link: 
>>>>> https://syzkaller.appspot.com/bug?extid=21016130b0580a9de3b5
>>>>> compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
>>>>>
>>>>> Unfortunately, I don't have any reproducer for this crash yet.
>>>>>
>>>>> IMPORTANT: if you fix the bug, please add the following tag to the 
>>>>> commit:
>>>>> Reported-by: syzbot+21016130b0580a9de3b5@...kaller.appspotmail.com
>>>>
>>>> Hi John, Tyler,
>>>>
>>>> I've switched syzbot from selinux to apparmor as we discussed on lss:
>>>> https://github.com/google/syzkaller/commit/2c6cb254ae6c06f61e3aba21bb89ffb05b5db946 
>>>>
>>>
>>> Sorry, does this mean that you are no longer testing selinux via syzbot?
>>>    That seems unfortunate.  SELinux is default-enabled and used in
>>> Fedora, RHEL and all derivatives (e.g. CentOS), and mandatory in Android
>>> (and seemingly getting some use in ChromeOS now as well, at least for
>>> the Android container and possibly wider), so it seems unwise to drop it
>>> from your testing altogether.  I was under the impression that you were
>>> just going to add apparmor to your testing matrix, not drop selinux
>>> altogether.
>>
>> It is also important to note that testing with SELinux enabled but no
>> policy loaded is not going to be very helpful (last we talked that is
>> what syzbot is/was doing).  While syzbot did uncover some issues
>> relating to the enabled-no-policy case, those are much less
>> interesting and less relevant than the loaded-policy case.
> 
> I had thought that they had switched over to at least loading a policy 
> but possibly left it in permissive mode because the base distribution 
> didn't properly support SELinux out of the box.  But I may be mistaken.
> Regardless, the right solution is to migrate to testing with a policy 
> loaded not to stop testing altogether.
> 
> Optimally, they'd test on at least one distribution/OS where SELinux is 
> in fact supported out of the box, e.g. CentOS, Android, and/or ChromeOS.

Or Fedora, of course.