WARNING in apparmor_secid_to_secctx

[Dmitry Vyukov]

On Thu, Sep 6, 2018 at 12:59 PM, Dmitry Vyukov <dvyukov at google.com> wrote:
> On Wed, Sep 5, 2018 at 7:37 PM, Casey Schaufler <casey at schaufler-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.