netdev - RE: [PATCH 1/4 V2] Ethernet drivers in 3.14-rc3 kernel: fix 3 buffer overflows triggered by hardware devices

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Date:	Tue, 25 Mar 2014 17:05:00 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Alon Nafta' <alon@...vatecore.com>
CC:	Ben Hutchings <ben@...adent.org.uk>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Grant Grundler <grantgrundler@...il.com>
Subject: RE: [PATCH 1/4 V2] Ethernet drivers in 3.14-rc3 kernel: fix 3
 buffer overflows triggered by hardware devices

From: Alon Nafta 
> Hi David,
> 
> Are you referring to (older) systems without IOMMU? Since IOMMU and
> VT-d (for Intel) exactly solve that security problem.

Yes - I don't know the details of the x86 IOMMU.

	David
 
> On Tue, Mar 25, 2014 at 2:37 AM, David Laight <David.Laight@...lab.com> wrote:
> > From: Alon Nafta
> >> I don't think they should be trusted at all, at least not to a point
> >> where it's feasible for them to execute code on your system.
> >> USB drivers, filesystem drivers, peripheral drivers - they're all on
> >> the same boat, obviously having different levels of severity depending
> >> on driver popularity.
> >
> > On a large number of systems any PCI or PCIe hardware has the
> > ability to read and write any system physical addresses.
> > Not only does this mean that 'dodgy' hardware can change the
> > kernel code, but also any attempt to restrict the memory that
> > the driver itself can access is likely to be circumventable.
> >
> > Yes, you can raise the barrier, but there will always be low
> > points on it.
> >
> >         David
> >
> >
> >


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