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Message-ID: <3615781.PPvlf9ziaL@tauon.chronox.de>
Date: Wed, 26 Jan 2022 10:01:17 +0100
From: Stephan Mueller <smueller@...onox.de>
To: Nicolai Stange <nstange@...e.de>,
Herbert Xu <herbert@...dor.apana.org.au>
Cc: "David S. Miller" <davem@...emloft.net>,
Hannes Reinecke <hare@...e.de>, Torsten Duwe <duwe@...e.de>,
Zaibo Xu <xuzaibo@...wei.com>,
Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
David Howells <dhowells@...hat.com>,
Jarkko Sakkinen <jarkko@...nel.org>,
linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
qat-linux@...el.com, keyrings@...r.kernel.org, simo@...hat.com,
Eric Biggers <ebiggers@...nel.org>, Petr Vorel <pvorel@...e.cz>
Subject: Re: [v2 PATCH] crypto: api - Disallow sha1 in FIPS-mode while allowing hmac(sha1)
Am Freitag, 14. Januar 2022, 11:55:26 CET schrieb Herbert Xu:
Hi Herbert,
>
> > This looks all good to me, but as !->fips_allowed tests aren't skipped
> > over anymore now, it would perhaps make sense to make their failure
> > non-fatal in FIPS mode. Because in FIPS mode a failure could mean a
> > panic and some of the existing TVs might not pass because of e.g. some
> > key length checks or so active only for fips_enabled...
>
> You mean a buggy non-FIPS algorithm that fails when tested in
> FIPS mode? I guess we could skip the panic in that case if
> everyone is happy with that. Stephan?
As we consider FIPS 140-3, we can allow a "degrated mode of operation". A
degraded mode of operation disables only the algorithm that caused the
failure. With a failing self test and not having a panic(), the offending
algorithm implementation will not be available to the kernel crypto API and
thus to a user.
In this case, we can replace the panic with a graceful error.
If that change is applied, I would like to mention to anybody that wants to
backport the change: this change is not appropriate for FIPS 140-2.
Ciao
Stephan
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