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

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Message-ID: <2c613462-825e-a3d1-9bf2-2314f0c1a4da@linux.microsoft.com>
Date:   Wed, 4 Dec 2019 14:43:59 -0800
From:   Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>, linux-integrity@...r.kernel.org
Cc:     Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        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 12/4/19 3:16 AM, Mimi Zohar wrote:

Hi Mimi,

> 
> The integrity subsystem, and other concepts upstreamed to support it,
> are being used by different people/companies in different ways.  I
> know some of the ways, but not all, as how it is being used.  For
> example, Mat Martineau gave an LSS2019-NA talk titled "Using and
> Implementing Keyring Restrictions for Userspace".  I don't know if he
> would be interested in measuring keys on these restricted userspace
> keyrings, but before we limit how a new feature works, we should at
> least look to see if that limitation is really necessary.
> 
> Mimi

I have updated the patch per your suggestion - if uid is specified in 
the policy for key measurement, then it is checked against the current 
user's credential.

Please review the updated patch set (v10).

thanks,
  -lakshmi