linux-kernel - Re: [bug] crypto/vmx/p8_ghash memory corruption in 4.8-rc7

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Message-ID: <20160928024446.GA14034@gondor.apana.org.au>
Date:   Wed, 28 Sep 2016 10:44:46 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Jan Stancek <jstancek@...hat.com>
Cc:     Marcelo Cerri <marcelo.cerri@...onical.com>,
        rui y wang <rui.y.wang@...el.com>,
        mhcerri@...ux.vnet.ibm.com, leosilva@...ux.vnet.ibm.com,
        pfsmorigo@...ux.vnet.ibm.com, linux-crypto@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [bug] crypto/vmx/p8_ghash memory corruption in 4.8-rc7

On Tue, Sep 27, 2016 at 05:01:03AM -0400, Jan Stancek wrote:
> 
> Also, does that mean that padlock_sha has similar problem?
> It does not seem to reserve any space for fallback __ctx and it calls
> init()/update()/export() with padlock_sha_desc's fallback:
> 
> struct padlock_sha_desc {
>         struct shash_desc fallback;
> };
> 
> static struct shash_alg sha1_alg = {
>         .descsize       =       sizeof(struct padlock_sha_desc),

Actually I was wrong when I said that the API couldn't handle
a dynamic fallback.  It can and padlock-sha does the right thing
by updating descsize in the cra_init function.

So this is what vmx should do too.

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