linux-kernel - Re: [PATCH] crypto: ctr: avoid VLA use

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Date:   Wed, 14 Mar 2018 14:52:29 +0100
From:   Stephan Mueller <smueller@...onox.de>
To:     Salvatore Mesoraca <s.mesoraca16@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        linux-crypto@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] crypto: ctr: avoid VLA use

Am Mittwoch, 14. März 2018, 14:46:29 CET schrieb Salvatore Mesoraca:

Hi Salvatore,

> 2018-03-14 14:31 GMT+01:00 Stephan Mueller <smueller@...onox.de>:
> > Am Mittwoch, 14. März 2018, 14:17:30 CET schrieb Salvatore Mesoraca:
> > 
> > Hi Salvatore,
> > 
> >>       if (walk.nbytes) {
> >> 
> >> -             crypto_ctr_crypt_final(&walk, child);
> >> -             err = blkcipher_walk_done(desc, &walk, 0);
> >> +             err = crypto_ctr_crypt_final(&walk, child);
> >> +             err = blkcipher_walk_done(desc, &walk, err);
> > 
> > I guess you either want to handle the error from crypto_ctr_crypt_final or
> > do an err |= blkcipher_walk_done.
> 
> I think that blkcipher_walk_done handles and returns the error for me.
> Am I wrong?

You are right as you want to finalize the crypto operation even though the 
encryption fails.

Please disregard my comment.
> 
> Best regards,
> 
> Salvatore



Ciao
Stephan