linux-kernel - Re: [PATCH v3 4/9] dm integrity: Remove VLA usage

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Message-ID: <20180701062914.nihtpl5ekf7nytat@gondor.apana.org.au>
Date:   Sun, 1 Jul 2018 14:29:14 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Kees Cook <keescook@...omium.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Eric Biggers <ebiggers@...gle.com>,
        Alasdair Kergon <agk@...hat.com>,
        Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
        Lars Persson <larper@...s.com>,
        Mike Snitzer <snitzer@...hat.com>,
        Rabin Vincent <rabinv@...s.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        "David S. Miller" <davem@...emloft.net>,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@...r.kernel.org>, qat-linux@...el.com,
        dm-devel@...hat.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v3 4/9] dm integrity: Remove VLA usage

On Fri, Jun 29, 2018 at 02:56:37PM -0700, Kees Cook wrote:
>
> This conversion was following the existing check (PAGE_SIZE / 8), and
> not via an analysis of alg.digestsize users. Let me double-check. For
> predefined stuff, it looks like the largest is:
> 
> SKEIN1024_DIGEST_BIT_SIZE/8 == 128

This should be removed.  We shouldn't allow generic or new crypto
algorithms in staging.

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