linux-kernel - Re: [EXT] Re: [PATCH v0 3/8] crypto: hbk flags & info added to the tfm

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Date:   Thu, 20 Oct 2022 16:23:53 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Pankaj Gupta <pankaj.gupta@....com>,
        "jarkko@...nel.org" <jarkko@...nel.org>,
        "a.fatoum@...gutronix.de" <a.fatoum@...gutronix.de>,
        "gilad@...yossef.com" <gilad@...yossef.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "zohar@...ux.ibm.com" <zohar@...ux.ibm.com>,
        "dhowells@...hat.com" <dhowells@...hat.com>,
        "sumit.garg@...aro.org" <sumit.garg@...aro.org>,
        "david@...ma-star.at" <david@...ma-star.at>,
        "michael@...le.cc" <michael@...le.cc>,
        "john.ernberg@...ia.se" <john.ernberg@...ia.se>,
        "jmorris@...ei.org" <jmorris@...ei.org>,
        "serge@...lyn.com" <serge@...lyn.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "j.luebbe@...gutronix.de" <j.luebbe@...gutronix.de>,
        "richard@....at" <richard@....at>,
        "keyrings@...r.kernel.org" <keyrings@...r.kernel.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        Sahil Malhotra <sahil.malhotra@....com>,
        Kshitiz Varshney <kshitiz.varshney@....com>,
        Horia Geanta <horia.geanta@....com>,
        Varun Sethi <V.Sethi@....com>
Subject: Re: [EXT] Re: [PATCH v0 3/8] crypto: hbk flags & info added to the
 tfm

On Wed, Oct 19, 2022 at 09:26:05PM -0700, Eric Biggers wrote:

> Are you referring to the support for hardware-wrapped inline crypto keys?  It
> isn't upstream yet, but my latest patchset is at
> https://lore.kernel.org/linux-fscrypt/20220927014718.125308-2-ebiggers@kernel.org/T/#u.
> There's also a version of it used by some Android devices already.  Out of
> curiosity, are you using it in an Android device, or have you adopted it in some
> other downstream?

Unrelated to Android, similar functionality, but slightly different
ultimate purpose. We are going to be sending a fscrypt patch series
for mlx5 and nvme soonish.

> > Yes, it would be nice to see a comprehensive understand on how HW
> > resident keys can be modeled in the keyring.
> 
> Note that the keyrings subsystem is not as useful as it might seem.  It sounds
> like something you want (you have keys, and there is a subsystem called
> "keyrings", so it should be used, right?), but often it isn't.  fscrypt has
> mostly moved away from using it, as it caused lots of problems.  I would caution
> against assuming that it needs to be part of any solution.

That sounds disappointing that we are now having parallel ways for the
admin to manipulate kernel owned keys.

Jason