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Date:   Tue, 05 Jul 2022 16:11:45 -0700
From:   "H. Peter Anvin" <hpa@zytor.com>
To:     Borislav Petkov <bp@alien8.de>
CC:     "Jason A. Donenfeld" <Jason@zx2c4.com>,
        linux-arm-kernel@lists.infradead.org,
        linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
        linux-kernel@vger.kernel.org, x86@kernel.org,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Heiko Carstens <hca@linux.ibm.com>,
        Alexander Gordeev <agordeev@linux.ibm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Arnd Bergmann <arnd@arndb.de>
Subject: Re: [PATCH] random: remove CONFIG_ARCH_RANDOM and "nordrand"
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On July 5, 2022 3:00:04 PM PDT, Borislav Petkov <bp@alien8=2Ede> wrote:
>On Tue, Jul 05, 2022 at 02:50:34PM -0700, H=2E Peter Anvin wrote:
>> It's just math=2E The only variable is your confidence level, i=2Ee=2E =
at
>> what level do you decide that the likelihood of pure chance is way
>> smaller than the likelihood of hardware failure=2E
>
>That might be but the likelyhood of certain BIOSes dropping the ball
>after resume is 100%:
>
>7879fc4bdc75 ("x86/rdrand: Sanity-check RDRAND output")
>

What I'm wondering is if we shouldn't be simply instrument *every* invocat=
ion, and set the trust to zero if we ever trip it=2E