linux-kernel - Re: [PATCH v9 5/6] IMA: Add support to limit measuring keys

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Date:   Tue, 03 Dec 2019 11:47:41 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
        linux-integrity@...r.kernel.org
Cc:     eric.snowberg@...cle.com, dhowells@...hat.com,
        matthewgarrett@...gle.com, sashal@...nel.org,
        jamorris@...ux.microsoft.com, linux-kernel@...r.kernel.org,
        keyrings@...r.kernel.org
Subject: Re: [PATCH v9 5/6] IMA: Add support to limit measuring keys

On Tue, 2019-12-03 at 08:13 -0800, Lakshmi Ramasubramanian wrote:
> On 12/3/2019 4:25 AM, Mimi Zohar wrote:
> 
> Hi Mimi,
> 
> > Hi Lakshmi,
> > 
> > A keyring can be created by any user with any keyring name, other than
> >   ones dot prefixed, which are limited to the trusted builtin keyrings.
> >   With a policy of "func=KEY_CHECK template=ima-buf keyrings=foo", for
> > example, keys loaded onto any keyring named "foo" will be measured.
> >   For files, the IMA policy may be constrained to a particular uid/gid.
> >   An additional method of identifying or constraining keyring names
> > needs to be defined.
> > 
> 
> I agree - this is a good idea.
> 
> Do you think this can be added as a separate patch set - enhancement to 
> the current one, or should this be addressed in the current set?
> 
> I was just about to send an update today that addresses your latest 
> comments. Will hold it if you think the above change should be included 
> now. Please let me know.

I'm hoping that it won't be all that difficult to implement and could
be included in this patch set as an additional patch.

Mimi