linux-kernel - Re: WARNING in apparmor_secid_to

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Message-ID: <CACT4Y+a6Y1N1VbpLoJPyK5DFYyr8RGM_=mqpWwina=yTUEtUvg@mail.gmail.com>
Date:   Thu, 6 Sep 2018 13:19:31 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Casey Schaufler <casey@...aufler-ca.com>
Cc:     Paul Moore <paul@...l-moore.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        syzbot <syzbot+21016130b0580a9de3b5@...kaller.appspotmail.com>,
        tyhicks@...onical.com, John Johansen <john.johansen@...onical.com>,
        James Morris <jmorris@...ei.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-security-module@...r.kernel.org,
        Serge Hallyn <serge@...lyn.com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Jeffrey Vander Stoep <jeffv@...gle.com>,
        SELinux <selinux@...ho.nsa.gov>,
        Russell Coker <russell@...er.com.au>,
        Laurent Bigonville <bigon@...ian.org>
Subject: Re: WARNING in apparmor_secid_to_secctx

On Thu, Sep 6, 2018 at 12:59 PM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> On Wed, Sep 5, 2018 at 7:37 PM, Casey Schaufler <casey@...aufler-ca.com> wrote:
>> On 9/5/2018 4:08 AM, Dmitry Vyukov wrote:
>>> Thanks! I've re-enabled selinux on syzbot:
>>> https://github.com/google/syzkaller/commit/196410e4f5665d4d2bf6c818d06f1c8d03cfa8cc
>>> Now we will have instances with apparmor and with selinux.
>>
>> Any chance we could get a Smack instance as well?
>
> Hi Casey,
>
> Sure!
> Provided you want to fix bugs ;)
> I've setup an instance with smack enabled:
> https://github.com/google/syzkaller/commit/0bb7a7eb8e0958c6fbe2d69615b9fae4af88c8ee


But just doing default things does not seem to find much. I guess
common paths through the hooks are well exercised already.
So perhaps if we do more non-trivial things, it can find more stuff.
But what are they? Adding/changing/removing xattr's? Which? What are
the values? Changing security contexts? How? What else?
selinux has own filesystem and we should touch some files there:
https://github.com/google/syzkaller/blob/master/sys/linux/selinux.txt
But we don't anything similar for other modules.