linux-kernel - Re: [RFC PATCH v3 1/1] Add dm verity root hash pkcs7 sig validation

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Message-ID: <alpine.LRH.2.21.1906111524060.8305@namei.org>
Date:   Tue, 11 Jun 2019 15:31:45 +1000 (AEST)
From:   James Morris <jmorris@...ei.org>
To:     Milan Broz <gmazyland@...il.com>
cc:     Jaskaran Khurana <jaskarankhurana@...ux.microsoft.com>,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, agk@...hat.com, snitzer@...hat.com,
        dm-devel@...hat.com, scottsh@...rosoft.com, ebiggers@...gle.com,
        Mikulas Patocka <mpatocka@...hat.com>
Subject: Re: [RFC PATCH v3 1/1] Add dm verity root hash pkcs7 sig
 validation

On Sat, 8 Jun 2019, Milan Broz wrote:

> > Adds DM_VERITY_VERIFY_ROOTHASH_SIG_FORCE: roothash signature *must* be
> > specified for all dm verity volumes and verification must succeed prior
> > to creation of device mapper block device.
> 
> AFAIK there are tools that use dm-verity internally (some container
> functions in systemd can recognize and check dm-verity partitions) and with
> this option we will just kill possibility to use it without signature.
> 
> Anyway, this is up to Mike and Mikulas, I guess generic distros will not
> set this option.

Right, I think this option would not be for a general purpose distro, but 
for embedded systems and other cases where the user may want a more 
tightly locked-down system.

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