netdev - RE: alignment faults in 3.6

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Message-ID: <1350058407.2819.15.camel@bwh-desktop.uk.solarflarecom.com>
Date:	Fri, 12 Oct 2012 17:13:27 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	David Laight <David.Laight@...LAB.COM>
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Måns Rullgård <mans@...sr.com>,
	Arnd Bergmann <arnd@...db.de>,
	<linux-arm-kernel@...ts.infradead.org>, <netdev@...r.kernel.org>,
	Jon Masters <jonathan@...masters.org>
Subject: RE: alignment faults in 3.6

On Fri, 2012-10-12 at 16:47 +0100, David Laight wrote:
> > AC was so useless that it has now been reallocated to use by SMAP
> > <https://lwn.net/Articles/517251/>.
> 
> That is a long time coming!
> Wonder when it will appear in any cpus.
> 
> How am I going to get root access when I can't get the kernel
> to execute code at address 0 any more :-)

Moving further off the topic: that is supposed to be prevented by a
separate feature, SMEP, which I think is available in current Intel CPUs
(Ivy Bridge).  Also, unprivileged users are generally not permitted to
mmap() at address 0.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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