linux-kernel - RE: [EXT] Re: [PATCH v5 3/5] KEYS: trusted: allow trust sources to use kernel RNG for key material

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Date:   Fri, 25 Feb 2022 11:57:22 +0000
From:   Pankaj Gupta <pankaj.gupta@....com>
To:     Ahmad Fatoum <a.fatoum@...gutronix.de>,
        James Bottomley <jejb@...ux.ibm.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        David Howells <dhowells@...hat.com>
CC:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        Sumit Garg <sumit.garg@...aro.org>,
        David Gstir <david@...ma-star.at>,
        "tharvey@...eworks.com" <tharvey@...eworks.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Horia Geanta <horia.geanta@....com>,
        Aymen Sghaier <aymen.sghaier@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Biggers <ebiggers@...nel.org>,
        Jan Luebbe <j.luebbe@...gutronix.de>,
        Richard Weinberger <richard@....at>,
        Franck Lenormand <franck.lenormand@....com>,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>,
        "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>
Subject: RE: [EXT] Re: [PATCH v5 3/5] KEYS: trusted: allow trust sources to
 use kernel RNG for key material

Reviewed-by: Pankaj Gupta <pankaj.gupta@....com>

> -----Original Message-----
> From: Ahmad Fatoum <a.fatoum@...gutronix.de>
> Sent: Wednesday, February 23, 2022 9:53 PM
> To: James Bottomley <jejb@...ux.ibm.com>; Jarkko Sakkinen
> <jarkko@...nel.org>; Mimi Zohar <zohar@...ux.ibm.com>; David Howells
> <dhowells@...hat.com>
> Cc: kernel@...gutronix.de; Sumit Garg <sumit.garg@...aro.org>; David Gstir
> <david@...ma-star.at>; tharvey@...eworks.com; James Morris
> <jmorris@...ei.org>; Serge E. Hallyn <serge@...lyn.com>; Horia Geanta
> <horia.geanta@....com>; Aymen Sghaier <aymen.sghaier@....com>; Herbert
> Xu <herbert@...dor.apana.org.au>; David S. Miller <davem@...emloft.net>;
> Eric Biggers <ebiggers@...nel.org>; Jan Luebbe <j.luebbe@...gutronix.de>;
> Richard Weinberger <richard@....at>; Franck Lenormand
> <franck.lenormand@....com>; Matthias Schiffer <matthias.schiffer@...tq-
> group.com>; Pankaj Gupta <pankaj.gupta@....com>; keyrings@...r.kernel.org;
> linux-crypto@...r.kernel.org; linux-integrity@...r.kernel.org; linux-
> kernel@...r.kernel.org; linux-security-module@...r.kernel.org
> Subject: [EXT] Re: [PATCH v5 3/5] KEYS: trusted: allow trust sources to use
> kernel RNG for key material
> 
> Caution: EXT Email
> 
> On 22.02.22 20:58, Ahmad Fatoum wrote:
> > The two existing trusted key sources don't make use of the kernel RNG,
> > but instead let the hardware that does the sealing/unsealing also
> > generate the random key material. While a previous change offers users
> > the choice to use the kernel RNG instead for both, new trust sources
> > may want to unconditionally use the kernel RNG for generating key
> > material, like it's done elsewhere in the kernel.
> >
> > This is especially prudent for hardware that has proven-in-production
> > HWRNG drivers implemented, as otherwise code would have to be
> > duplicated only to arrive at a possibly worse result.
> >
> > Make this possible by turning struct trusted_key_ops::get_random into
> > an optional member. If a driver leaves it NULL, kernel RNG will be
> > used instead.
> 
> The rebase on the change in scope of the previous commit made this one here
> quite small. I would squash it into the previous commit for v6, unless there are
> objections.
> 
> 
> >
> > Acked-by: Sumit Garg <sumit.garg@...aro.org>
> > Reviewed-by: David Gstir <david@...ma-star.at>
> > Tested-By: Tim Harvey <tharvey@...eworks.com>
> > Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
> > ---
> > To: James Bottomley <jejb@...ux.ibm.com>
> > To: Jarkko Sakkinen <jarkko@...nel.org>
> > To: Mimi Zohar <zohar@...ux.ibm.com>
> > To: David Howells <dhowells@...hat.com>
> > Cc: James Morris <jmorris@...ei.org>
> > Cc: "Serge E. Hallyn" <serge@...lyn.com>
> > Cc: "Horia Geantă" <horia.geanta@....com>
> > Cc: Aymen Sghaier <aymen.sghaier@....com>
> > Cc: Herbert Xu <herbert@...dor.apana.org.au>
> > Cc: "David S. Miller" <davem@...emloft.net>
> > Cc: Eric Biggers <ebiggers@...nel.org>
> > Cc: Jan Luebbe <j.luebbe@...gutronix.de>
> > Cc: David Gstir <david@...ma-star.at>
> > Cc: Richard Weinberger <richard@....at>
> > Cc: Franck LENORMAND <franck.lenormand@....com>
> > Cc: Sumit Garg <sumit.garg@...aro.org>
> > Cc: Tim Harvey <tharvey@...eworks.com>
> > Cc: Matthias Schiffer <matthias.schiffer@...tq-group.com>
> > Cc: Pankaj Gupta <pankaj.gupta@....com>
> > Cc: keyrings@...r.kernel.org
> > Cc: linux-crypto@...r.kernel.org
> > Cc: linux-integrity@...r.kernel.org
> > Cc: linux-kernel@...r.kernel.org
> > Cc: linux-security-module@...r.kernel.org
> > ---
> >  include/keys/trusted-type.h | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/include/keys/trusted-type.h b/include/keys/trusted-type.h
> > index d89fa2579ac0..4eb64548a74f 100644
> > --- a/include/keys/trusted-type.h
> > +++ b/include/keys/trusted-type.h
> > @@ -64,7 +64,7 @@ struct trusted_key_ops {
> >       /* Unseal a key. */
> >       int (*unseal)(struct trusted_key_payload *p, char *datablob);
> >
> > -     /* Get a randomized key. */
> > +     /* Optional: Get a randomized key. */
> >       int (*get_random)(unsigned char *key, size_t key_len);
> >
> >       /* Exit key interface. */
> 
> 
> --
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