linux-kernel - Re: [RFC PATCH v3 05/12] fs: add security blob and hooks for block

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Date:   Thu, 23 Apr 2020 02:42:49 +1000 (AEST)
From:   James Morris <jmorris@...ei.org>
To:     deven.desai@...ux.microsoft.com
cc:     agk@...hat.com, axboe@...nel.dk, snitzer@...hat.com,
        "Serge E. Hallyn" <serge@...lyn.com>, zohar@...ux.ibm.com,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, dm-devel@...hat.com,
        linux-block@...r.kernel.org, jannh@...gle.com,
        tyhicks@...ux.microsoft.com, pasha.tatashin@...een.com,
        sashal@...nel.org, jaskarankhurana@...ux.microsoft.com,
        nramas@...ux.microsoft.com, mdsakib@...ux.microsoft.com,
        linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        Chad Sellers <csellers@...sys.com>,
        John Johansen <john.johansen@...onical.com>
Subject: Re: [RFC PATCH v3 05/12] fs: add security blob and hooks for
 block_device

On Wed, 15 Apr 2020, deven.desai@...ux.microsoft.com wrote:

> From: Deven Bowers <deven.desai@...ux.microsoft.com>
> 
> Add a security blob and associated allocation, deallocation and set hooks
> for a block_device structure.
> 
> Signed-off-by: Deven Bowers <deven.desai@...ux.microsoft.com>

Is there any feedback from block or LSM folk on the addition of a security 
blob for block_device here?

IPE uses this is to track the status of integrity verification of e.g. 
DM-Verity devices, per this code from a subsequent patch:


+       ret = security_bdev_setsecurity(dm_table_get_md(v->ti->table)->bdev,
+                                       DM_VERITY_SIGNATURE_SEC_NAME,
+                                       v->sig->sig, v->sig->sig_size);


-- 
James Morris
<jmorris@...ei.org>