linux-kernel - Re: [PATCH] crypto: testmgr - reduce stack usage in fuzzers

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Message-ID: <20190617142419.yw4w5w344tf6ozrb@gondor.apana.org.au>
Date:   Mon, 17 Jun 2019 22:24:19 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Kees Cook <keescook@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Biggers <ebiggers@...gle.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Vitaly Chikunov <vt@...linux.org>,
        Gilad Ben-Yossef <gilad@...yossef.com>,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] crypto: testmgr - reduce stack usage in fuzzers

On Mon, Jun 17, 2019 at 04:10:44PM +0200, Arnd Bergmann wrote:
>
> In most cases, this ends up in favor of clang (concerning the stack
> warning size limit) because most variables are small, but here we have
> a large stack object (two objects for the hash fuzzing) with a large redzone.

Oh I missed the fact that there is another large stack variable
further up the stack.  So what happens if you just convert that
one and leave the shash descriptor alone?

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt