linux-kernel - Re: [Xen-devel] [PATCH 1/2] xen-pciback: limit guest control of command register

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Message-ID: <550052D4.8070208@citrix.com>
Date:	Wed, 11 Mar 2015 14:36:04 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Jan Beulich <JBeulich@...e.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	xen-devel <xen-devel@...ts.xenproject.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 1/2] xen-pciback: limit guest control of command
 register

On 11/03/15 13:51, Jan Beulich wrote:
> Otherwise the guest can abuse that control to cause e.g. PCIe
> Unsupported Request responses (by disabling memory and/or I/O decoding
> and subsequently causing [CPU side] accesses to the respective address
> ranges), which (depending on system configuration) may be fatal to the
> host.
> 
> Note that to alter any of the bits collected together as
> PCI_COMMAND_GUEST permissive mode is now required to be enabled
> globally or on the specific device.
> 
> This is CVE-2015-2150 / XSA-120.

Applied to stable/for-linus-4.0 and tagged for stable, thanks.

David
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