linux-kernel - Re: Remaining crypto API regressions with CONFIG_VMAP

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Message-ID: <20161213033942.GC5601@gondor.apana.org.au>
Date:   Tue, 13 Dec 2016 11:39:42 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Gary R Hook <ghook@....com>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Eric Biggers <ebiggers3@...il.com>,
        linux-crypto@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        Andrew Lutomirski <luto@...nel.org>,
        Stephan Mueller <smueller@...onox.de>
Subject: Re: Remaining crypto API regressions with CONFIG_VMAP_STACK

On Mon, Dec 12, 2016 at 12:45:18PM -0600, Gary R Hook wrote:
> On 12/12/2016 12:34 PM, Andy Lutomirski wrote:
> 
> <...snip...>
> 
> >
> >I have a patch to make these depend on !VMAP_STACK.
> >
> >>        drivers/crypto/ccp/ccp-crypto-aes-cmac.c:105,119,142
> >>        drivers/crypto/ccp/ccp-crypto-sha.c:95,109,124
> >>        drivers/crypto/ccp/ccp-crypto-aes-xts.c:162
> >>        drivers/crypto/ccp/ccp-crypto-aes.c:94
> >
> >According to Herbert, these are fine.  I'm personally less convinced
> >since I'm very confused as to what "async" means in the crypto code,
> >but I'm going to leave these alone.
> 
> I went back through the code, and AFAICT every argument to sg_init_one() in
> the above-cited files is a buffer that is part of the request context. Which
> is allocated by the crypto framework, and therefore will never be on the
> stack.
> Right?

Right.

Cheers,
-- 
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