linux-kernel - Re: [PATCH] lib/crypto: blake2s: fix a CFI failure

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Date:   Wed, 19 Jan 2022 11:56:39 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Miles Chen <miles.chen@...iatek.com>
Cc:     ardb@...nel.org, davem@...emloft.net, gregkh@...uxfoundation.org,
        herbert@...dor.apana.org.au, linux-arm-kernel@...ts.infradead.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, matthias.bgg@...il.com,
        nathan@...nel.org, ndesaulniers@...gle.com
Subject: Re: [PATCH] lib/crypto: blake2s: fix a CFI failure

On 1/19/22, Jason A. Donenfeld <Jason@...c4.com> wrote:
> Hi Miles,
>
> Okay. Keep me posted.
>
> Just FYI, as mentioned, I'm unable to reproduce this, and you haven't
> provided any further minimized guidance on how I might reproduce this,
> so it'll sit in the "not a bug" bin until I have another clue on how
> to reproduce. Alternatively, Nick and Nathan are now on this thread
> and they usually have good luck teasing out compiler issues and such,
> so maybe they'll have an idea. But I'm afraid with the information I
> currently have, I'm at a dead end.
>
> Jason
>

We're back in business! I was able to reproduce this using FullLTO
rather than ThinLTO.