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

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Date:   Wed, 19 Jan 2022 17:43:42 +0800
From:   Miles Chen <miles.chen@...iatek.com>
To:     <ardb@...nel.org>
CC:     <Jason@...c4.com>, <davem@...emloft.net>, <ebiggers@...gle.com>,
        <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>,
        <miles.chen@...iatek.com>, <samitolvanen@...gle.com>
Subject: Re: [PATCH] lib/crypto: blake2s: fix a CFI failure

>Ehm, maybe not. As Jason points out, the typedef does not have quite
>the right type, so that is most likely the culprit, and this
>workaround would trigger CFI in exactly the same way.
>
>Interestingly, the compiler does not seem to mind, right? Or are you
>seeing any build time warnings on the reference to blake2s_compress in
>the call to __blake2s_update() ?

No, no warnings as the -Wcast-function-type is globally enabled.
I cleaned some cast-function-type errors but no warnings in
__blake2s_update.


Miles