linux-kernel - Re: [Xen-devel] [PATCH V2 1/3] xen: mark pvscsi frontend request consumed only after last read

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Message-ID: <54E73C34.6080901@citrix.com>
Date:	Fri, 20 Feb 2015 13:52:52 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Juergen Gross <jgross@...e.com>, <linux-kernel@...r.kernel.org>,
	<xen-devel@...ts.xensource.com>, <konrad.wilk@...cle.com>,
	<david.vrabel@...rix.com>, <boris.ostrovsky@...cle.com>
Subject: Re: [Xen-devel] [PATCH V2 1/3] xen: mark pvscsi frontend request
 consumed only after last read

On 17/02/15 07:02, Juergen Gross wrote:
> A request in the ring buffer mustn't be read after it has been marked
> as consumed. Otherwise it might already have been reused by the
> frontend without violating the ring protocol.
> 
> To avoid inconsistencies in the backend only work on a private copy
> of the request. This will ensure a malicious guest not being able to
> bypass consistency checks of the backend by modifying an active
> request.

Applied to stable/for-linus-3.20 and tagged for stable, thanks.

David
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