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Date: Fri, 12 Aug 2016 13:14:49 +0200
From: "Rafael J. Wysocki" <>
To: Borislav Petkov <>
Cc: Thomas Garnier <>, "Rafael J . Wysocki" <>, 
	Len Brown <>, Pavel Machek <>, Linux PM <>, 
	Linux Kernel Mailing List <>, Kees Cook <>, 
	Kernel Hardening <>, Jiri Kosina <>, 
	Yinghai Lu <>
Subject: Re: [PATCH v1] x86/power/64: Restore processor state before using
 per-cpu variables

On Fri, Aug 12, 2016 at 7:49 AM, Borislav Petkov <> wrote:
> On Thu, Aug 11, 2016 at 02:49:29PM -0700, Thomas Garnier wrote:
>> Restore the processor state before calling any other function to ensure
>> per-cpu variables can be used with KASLR memory randomization.
>> Tracing functions use per-cpu variables (gs based) and one was called
>> just before restoring the processor state fully. It resulted in a double
>> fault when both the tracing & the exception handler functions tried to
>> use a per-cpu variable.
>> Signed-off-by: Thomas Garnier <>
>> ---
>> Based on next-20160808
> Ok, I believe before I test this, I need to apply another patch from
> Rafael. I think it is the "Always create temporary identity mapping
> correctly" thing.
> Yes, no?


> Rafael, can you please apply everything on a test branch for us to run?

You can simply test my linux-next branch:

git:// \

That's 4.8-rc1 plus 3 fixes on top of it.


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