linux-kernel - Re: [PATCH v7 1/4] KEYS: trusted: Add generic trusted keys framework

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Message-ID: <20201013014304.GC41176@linux.intel.com>
Date:   Tue, 13 Oct 2020 04:43:04 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Sumit Garg <sumit.garg@...aro.org>
Cc:     zohar@...ux.ibm.com, jejb@...ux.ibm.com, dhowells@...hat.com,
        jens.wiklander@...aro.org, corbet@....net, jmorris@...ei.org,
        serge@...lyn.com, casey@...aufler-ca.com, janne.karhunen@...il.com,
        daniel.thompson@...aro.org, Markus.Wamser@...ed-mode.de,
        lhinds@...hat.com, keyrings@...r.kernel.org,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        op-tee@...ts.trustedfirmware.org,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH v7 1/4] KEYS: trusted: Add generic trusted keys framework

On Wed, Oct 07, 2020 at 03:37:45PM +0530, Sumit Garg wrote:
> Current trusted keys framework is tightly coupled to use TPM device as
> an underlying implementation which makes it difficult for implementations
> like Trusted Execution Environment (TEE) etc. to provide trusted keys
> support in case platform doesn't posses a TPM device.
> 
> Add a generic trusted keys framework where underlying implementations
> can be easily plugged in. Create struct trusted_key_ops to achieve this,
> which contains necessary functions of a backend.
> 
> Also, add a module parameter in order to select a particular trust source
> in case a platform support multiple trust sources.
> 
> Suggested-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> Signed-off-by: Sumit Garg <sumit.garg@...aro.org>

This is exactly kind of place where I think static_call() should be
taken into use, which is a v5.10 feature [1]. For background and
context, I'd read [2].

The other thing that I see that does not make much else than additional
complexity, is trusted_tpm.ko. We can do with one trusted.ko.

I'd also *guess* that the static_call() mechanism does not work accross
module boundaries.

[1] https://lore.kernel.org/lkml/20201012155542.GA3557765@gmail.com/
[2] https://lwn.net/Articles/815908/

/Jarkko