linux-kernel - Re: [RFC PATCH v9 10/16] dm-verity: consume root hash digest and signature data via LSM hook

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Date:   Wed, 1 Feb 2023 15:26:39 -0800
From:   Fan Wu <wufan@...ux.microsoft.com>
To:     Roberto Sassu <roberto.sassu@...weicloud.com>
Cc:     corbet@....net, zohar@...ux.ibm.com, jmorris@...ei.org,
        serge@...lyn.com, tytso@....edu, ebiggers@...nel.org,
        axboe@...nel.dk, agk@...hat.com, snitzer@...nel.org,
        eparis@...hat.com, paul@...l-moore.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, linux-audit@...hat.com,
        roberto.sassu@...wei.com, linux-kernel@...r.kernel.org,
        Deven Bowers <deven.desai@...ux.microsoft.com>
Subject: Re: [RFC PATCH v9 10/16] dm-verity: consume root hash digest and
 signature data via LSM hook

On Tue, Jan 31, 2023 at 02:22:01PM +0100, Roberto Sassu wrote:
> On Mon, 2023-01-30 at 14:57 -0800, Fan Wu wrote:
> > From: Deven Bowers <deven.desai@...ux.microsoft.com>
> > 
> > dm-verity provides a strong guarantee of a block device's integrity. As
> > a generic way to check the integrity of a block device, it provides
> > those integrity guarantees to its higher layers, including the filesystem
> > level.
> 
> I think you could reuse most of is_trusted_verity_target(), in
> particular dm_verity_get_root_digest().
> 
> And probably, the previous patch is not necessary.
> 
> Roberto
> 
Thanks for the info. This function seems could be used to get the roothash
but for saving the signature we still need the hook function in the previous
patch.

-Fan