linux-kernel - Re: [RFC PATCH v9 09/16] block|security: add LSM blob to block

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Message-ID: <20230131230100.GA30104@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
Date:   Tue, 31 Jan 2023 15:01:00 -0800
From:   Fan Wu <wufan@...ux.microsoft.com>
To:     Christoph Hellwig <hch@...radead.org>
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 09/16] block|security: add LSM blob to block_device

On Tue, Jan 31, 2023 at 12:53:59AM -0800, Christoph Hellwig wrote:
> On Mon, Jan 30, 2023 at 02:57:24PM -0800, Fan Wu wrote:
> > From: Deven Bowers <deven.desai@...ux.microsoft.com>
> > 
> > block_device structures can have valuable security properties,
> > based on how they are created, and what subsystem manages them.
> 
> That's a lot of cloudy talk but no real explanation.

Sorry for being too general here. Currently the only use target of this hook is dm-verity. We use the newly added security hook to save the dm-verity roothash and signature to the new bdev security blob during the bdev creation time, so LSMs can leverage this information to protect the system. 

I will add this example in the next version.

-Fan