linux-kernel - Re: [PATCH 01/17] x86, fpu: wrap get_xsave

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Date:	Sat, 25 Apr 2015 11:31:19 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Dave Hansen <dave@...1.net>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org, tglx@...utronix.de,
	dave.hansen@...ux.intel.com, oleg@...hat.com, riel@...hat.com,
	sbsiddha@...il.com, luto@...capital.net, mingo@...hat.com,
	hpa@...or.com, fenghua.yu@...el.com
Subject: Re: [PATCH 01/17] x86, fpu: wrap get_xsave_addr() to make it safer

On Wed, Apr 22, 2015 at 11:27:31AM -0700, Dave Hansen wrote:
> 
> From: Dave Hansen <dave.hansen@...ux.intel.com>
> 
> Changes from "v19":
>  * remove 'tsk' argument to get_xsave_addr() since the code
>    can only realistically work on 'current', and fix up the
>    comment a bit to match.
> 
> Changes from "v17":
>  * fix s/xstate/xsave_field/ in the function comment
>  * remove EXPORT_SYMBOL_GPL()
> 
> ---
> From: Dave Hansen <dave.hansen@...ux.intel.com>
> 
> The MPX code appears to be saving off the FPU in an unsafe
> way.   It does not disable preemption or ensure that the
> FPU state has been allocated.
> 
> This patch introduces a new helper which will do both of
> those things internally.
> 
> Note that this requires a patch from Oleg in order to work
> properly.  It is currently in tip/x86/fpu.
> 
> > commit f893959b0898bd876673adbeb6798bdf25c034d7
> > Author: Oleg Nesterov <oleg@...hat.com>
> > Date:   Fri Mar 13 18:30:30 2015 +0100
> >
> >    x86/fpu: Don't abuse drop_init_fpu() in flush_thread()
> 
> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Oleg Nesterov <oleg@...hat.com>
> Cc: bp@...en8.de
> Cc: Rik van Riel <riel@...hat.com>
> Cc: Suresh Siddha <sbsiddha@...il.com>
> Cc: Andy Lutomirski <luto@...capital.net>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Fenghua Yu <fenghua.yu@...el.com>
> Cc: the arch/x86 maintainers <x86@...nel.org>
> ---
> 
>  b/arch/x86/include/asm/xsave.h |    1 +
>  b/arch/x86/kernel/xsave.c      |   32 ++++++++++++++++++++++++++++++++
>  2 files changed, 33 insertions(+)

Applied, thanks.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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