linux-kernel - Re: [PATCH v5 10/13] x86/xsaves: Fix __fpu_restore

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Message-ID: <573120B8.9070805@linux.intel.com>
Date:	Mon, 9 May 2016 16:43:52 -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 10/13] x86/xsaves: Fix __fpu_restore_sig() for XSAVES

On 05/09/2016 01:46 PM, Yu-cheng Yu wrote:
> When the kernel is using XSAVES compacted format, we cannot do
> __copy_from_user() from a signal frame, which has standard-format data.
> Fix it by using copyin_to_xsaves().
... which converts between formats and filters out all supervisor state,
which we do not want to allow userspace to write.

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