netdev - Re: [PATCH v2] vhost: block speculation of translated descriptors

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Date:   Wed, 11 Sep 2019 17:25:04 +0100
From:   Will Deacon <will@...nel.org>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Jason Wang <jasowang@...hat.com>,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, security@...nel.org
Subject: Re: [PATCH v2] vhost: block speculation of translated descriptors

On Wed, Sep 11, 2019 at 09:52:25AM -0400, Michael S. Tsirkin wrote:
> On Wed, Sep 11, 2019 at 08:10:00AM -0400, Michael S. Tsirkin wrote:
> > iovec addresses coming from vhost are assumed to be
> > pre-validated, but in fact can be speculated to a value
> > out of range.
> > 
> > Userspace address are later validated with array_index_nospec so we can
> > be sure kernel info does not leak through these addresses, but vhost
> > must also not leak userspace info outside the allowed memory table to
> > guests.
> > 
> > Following the defence in depth principle, make sure
> > the address is not validated out of node range.
> > 
> > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> > Acked-by: Jason Wang <jasowang@...hat.com>
> > Tested-by: Jason Wang <jasowang@...hat.com>
> > ---
> 
> Cc: security@...nel.org
> 
> Pls advise on whether you'd like me to merge this directly,
> Cc stable, or handle it in some other way.

I think you're fine taking it directly, with a cc stable and a Fixes: tag.

Cheers,

Will