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Date:   Wed, 4 May 2022 12:20:22 +0300
From:   Andy Shevchenko <andriy.shevchenko@intel.com>
To:     Mikulas Patocka <mpatocka@redhat.com>
Cc:     Stafford Horne <shorne@gmail.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andy Shevchenko <andy@kernel.org>,
        device-mapper development <dm-devel@redhat.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        "David S. Miller" <davem@davemloft.net>,
        Mike Snitzer <msnitzer@redhat.com>,
        Mimi Zohar <zohar@linux.ibm.com>,
        Milan Broz <gmazyland@gmail.com>, Jason@zx2c4.com
Subject: Re: [PATCH v2] hex2bin: make the function hex_to_bin constant-time
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On Wed, May 04, 2022 at 04:57:35AM -0400, Mikulas Patocka wrote:
> On Wed, 4 May 2022, Stafford Horne wrote:
> > On Mon, Apr 25, 2022 at 08:07:48AM -0400, Mikulas Patocka wrote:

...

> > Just a heads up it seems this patch is causing some instability with crypto self
> > tests on OpenRISC when using a PREEMPT kernel (no SMP).
> > 
> > This was reported by Jason A. Donenfeld as it came up in wireguard testing.
> > 
> > I am trying to figure out if this is an OpenRISC PREEMPT issue or something
> > else.

> That patch is so simple that I can't imagine how could it break the 
> curve25519 test. Are you sure that you bisected it correctly?

Can you provide a test cases for hex_to_bin()?

-- 
With Best Regards,
Andy Shevchenko