Re: [bug] crypto/vmx/p8_ghash memory corruption in 4.8-rc7
From: Marcelo Cerri
Date: Mon Sep 26 2016 - 13:43:30 EST
Wouldn't be enough to provide a pair of import/export functions as the
padlock-sha driver does?
On Mon, Sep 26, 2016 at 10:59:34PM +0800, Herbert Xu wrote:
> On Fri, Sep 23, 2016 at 08:22:27PM -0400, Jan Stancek wrote:
> > This seems to directly correspond with:
> > p8_ghash_alg.descsize = sizeof(struct p8_ghash_desc_ctx) == 56
> > shash_tfm->descsize = sizeof(struct p8_ghash_desc_ctx) + crypto_shash_descsize(fallback) == 56 + 20
> > where 20 is presumably coming from "ghash_alg.descsize".
> > My gut feeling was that these 2 should match, but I'd love to hear
> > what crypto people think.
> Indeed. The vmx driver is broken. It is allocating a fallback
> but is not providing any space for the state of the fallback.
> Unfortunately our interface doesn't really provide a way to provide
> the state size dynamically. So what I'd suggest is to fix the
> fallback to the generic ghash implementation and export its state
> size like we do for md5/sha.
> Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
> Home Page: http://gondor.apana.org.au/~herbert/
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