linux-kernel - Re: [RFC PATCH v10 11/17] dm-verity: consume root hash digest and signature data via LSM hook

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Date:   Wed, 9 Aug 2023 00:40:23 +0100
From:   Alasdair G Kergon <agk@...hat.com>
To:     Fan Wu <wufan@...ux.microsoft.com>
Cc:     Paul Moore <paul@...l-moore.com>,
        Mike Snitzer <snitzer@...nel.org>, corbet@....net,
        zohar@...ux.ibm.com, jmorris@...ei.org, serge@...lyn.com,
        tytso@....edu, ebiggers@...nel.org, axboe@...nel.dk,
        agk@...hat.com, eparis@...hat.com, linux-doc@...r.kernel.org,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-fscrypt@...r.kernel.org, linux-block@...r.kernel.org,
        dm-devel@...hat.com, audit@...r.kernel.org,
        roberto.sassu@...wei.com, linux-kernel@...r.kernel.org,
        Deven Bowers <deven.desai@...ux.microsoft.com>
Subject: Re: [RFC PATCH v10 11/17] dm-verity: consume root hash digest and
 signature data via LSM hook

On Tue, Aug 08, 2023 at 03:45:03PM -0700, Fan Wu wrote:
> On Tue, Jul 25, 2023 at 04:43:48PM -0400, Paul Moore wrote:
> > Where would the finalize() hook be called?
> 
> It is in the __bind function in drivers/md/dm.c, calling just before 
> rcu_assign_pointer(md->map, (void *)t) which activates the inactive table.
 
That would be after the existing commit point, meaning the table swap
cannot be cancelled there, so is the finalize() you are proposing void()
i.e. designed so it always succeeds?

Alasdair