linux-kernel - Re: [PATCH 0/7 v22] LSM: Multiple concurrent LSMs

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Date:	Fri, 8 May 2015 10:00:13 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Casey Schaufler <casey@...aufler-ca.com>
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Paul Moore <paul@...l-moore.com>,
	James Morris <jmorris@...ei.org>,
	James Morris <james.l.morris@...cle.com>,
	LSM <linux-security-module@...r.kernel.org>,
	LKLM <linux-kernel@...r.kernel.org>,
	Paul Moore <pmoore@...hat.com>,
	John Johansen <john.johansen@...onical.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Eric Paris <eparis@...hat.com>
Subject: Re: [PATCH 0/7 v22] LSM: Multiple concurrent LSMs

On Fri, May 8, 2015 at 9:13 AM, Casey Schaufler <casey@...aufler-ca.com> wrote:
> On 5/8/2015 4:21 AM, Mimi Zohar wrote:
>> On Thu, 2015-05-07 at 13:36 -0700, Casey Schaufler wrote:
>>> On 5/7/2015 1:23 PM, Stephen Smalley wrote:
>>>> On 05/07/2015 04:22 PM, Mimi Zohar wrote:
>>>>> On Thu, 2015-05-07 at 14:07 -0400, Paul Moore wrote:
>>>>>> On Thu, May 7, 2015 at 10:47 AM, Casey Schaufler <casey@...aufler-ca.com> wrote:
>>>>>>> On 5/7/2015 4:37 AM, James Morris wrote:
>>>>>>>> On Sat, 2 May 2015, Casey Schaufler wrote:
>>>>>>>>
>>>>>>>>> Subject: [PATCH 0/7 v22] LSM: Multiple concurrent LSMs
>>>>>>>> Please add all of the Acked-by etc. from the patch review process.
>>>>>>> For v21 I had Acks from:
>>>>>>>
>>>>>>>         John Johansen <john.johansen@...onical.com>
>>>>>>>         Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
>>>>>>>         Stephen Smalley <sds@...ho.nsa.gov> (after patch 8/7)
>>>>>>>         Kees Cook <keescook@...omium.org>
>>>>>>>
>>>>>>> Would you check out v22 and supply (or not) your Acks?
>>>>>>>
>>>>>>> Eric, Paul, it would be reassuring if you'd chime in as well.
>>>>>> Kubernetes has swallowed Eric whole I'm afraid, I don't think you want
>>>>>> to wait on him to review these patches.
>>>>>>
>>>>>> However, it is a bit ridiculous that I haven't had time to seriously
>>>>>> review these patches yet; I promise to take a look and send my
>>>>>> comments/ACKs before my head hits the pillow tonight.
>>>>> Seems to be working with SELinux, EVM and IMA enabled.  I haven't tried
>>>>> enabling an additional LSM.   Casey, do you have an additional LSM for
>>>>> testing?
>>>> I've tested SELinux+Yama.
>>> The deepest "stack" you can have today is Capability+Yama+YourChoice.
>>> You always get Capability, so you really only get to choose if you stack
>>> Yama with something else. That's not more depth than you had before, but
>>> the special case coding for Capability and Yama is replaced to the general
>>> scheme.
>> Nice cleanup!  I assume this will pave the way for other small, builtin
>> LSMs.  :)
>>
>> I'm now running with Yama as well.  While enabling Yama, I noticed a
>> very minor issue with security/Kconfig.  It permits defining Yama as the
>> default LSM when it is stacked.
>
> You don't get Yama called twice in that case, which would be
> the primary concern. I have maintained the existing behavior,
> I think. The Yama special case stacking will go away when the
> general LSM list specification mechanism ("yama,apparmor") comes
> in. That ought to be in the next round.

Yup, this all looks correct. Thanks!

Acked-by: Kees Cook <keescook@...omium.org>

-Kees

-- 
Kees Cook
Chrome OS Security
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