linux-kernel - Re: [PATCH v5 04/13] x86/xsaves: Introduce a new check that allows correct xstates copy from kernel to user directly

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Message-ID: <57310A8F.8060508@linux.intel.com>
Date:	Mon, 9 May 2016 15:09:19 -0700
From:	Dave Hansen <dave.hansen@...ux.intel.com>
To:	Yu-cheng Yu <yu-cheng.yu@...el.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
Cc:	Andy Lutomirski <luto@...nel.org>, Borislav Petkov <bp@...e.de>,
	Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
	"Ravi V. Shankar" <ravi.v.shankar@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>
Subject: Re: [PATCH v5 04/13] x86/xsaves: Introduce a new check that allows
 correct xstates copy from kernel to user directly

On 05/09/2016 01:46 PM, Yu-cheng Yu wrote:
> XSAVES is a kernel instruction and uses a compacted format. When working
> with user space, the kernel should provide standard-format, non-supervisor
> state data. We cannot do __copy_to_user() from a compacted- format kernel
> xstate area to a signal frame.

Looks good now:

Reviewed-by: Dave Hansen <dave.hansen@...el.com>