linux-kernel - Re: [PATCH][GIT PULL][v3.3] x86: Test saved %rip in NMI to determine nested NMI

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Date:	Sun, 19 Feb 2012 15:34:39 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"hpanvin@...il.com" <hpa@...or.com>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH][GIT PULL][v3.3] x86: Test saved %rip in NMI to
 determine nested NMI

On Sun, 2012-02-19 at 05:46 -0800, hpanvin@...il.com wrote:
> Vsyscall page, not vdso...
> 

Peter,

My original patch was to check the %cs register against __KERNEL_CS, but
IIRC, you said that userspace can change that register to anything it
wanted before doing a long jump or something. Is this true for x86_64 as
well? I guess it would be because x86_64 can support 32bit apps.

Anyway, I'll add a check that makes sure that the RIP is less than the
FIXADDR sections as well.

-- Steve

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