linux-kernel - Re: [dpdk-dev] [PATCH 2/2] uio: new driver to support PCI MSI-X

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Date:	Tue, 6 Oct 2015 17:07:17 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Avi Kivity <avi@...lladb.com>
Cc:	Stephen Hemminger <stephen@...workplumber.org>, dev@...k.org,
	hjk@...sjkoch.de, gregkh@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [dpdk-dev] [PATCH 2/2] uio: new driver to support PCI MSI-X

On Tue, Oct 06, 2015 at 03:15:57PM +0300, Avi Kivity wrote:
> btw, (2) doesn't really add any insecurity.  The user could already poke at
> the msix tables (as well as perform DMA); they just couldn't get a useful
> interrupt out of them.

Poking at msix tables won't cause memory corruption unless msix and bus
mastering is enabled.  It's true root can enable msix and bus mastering
through sysfs - but that's easy to block or detect. Even if you don't
buy a security story, it seems less likely to trigger as a result
of a userspace bug.

-- 
MST
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