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From: Dave Hansen <dave.hansen@linux.intel.com>
To: Yu-cheng Yu <yu-cheng.yu@intel.com>,
	linux-kernel@vger.kernel.org, x86@kernel.org,
	"H. Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>, Borislav Petkov <bp@suse.de>,
	Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
	"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
	Fenghua Yu <fenghua.yu@intel.com>
Subject: Re: [PATCH v5 04/13] x86/xsaves: Introduce a new check that allows correct xstates copy from kernel to user directly
Date: Mon, 9 May 2016 15:09:19 -0700	[thread overview]
Message-ID: <57310A8F.8060508@linux.intel.com> (raw)
In-Reply-To: <1655fc17bc9b8f5eeca1b2bbeac55bdbce0646a0.1462816638.git.yu-cheng.yu@intel.com>

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@intel.com>

  reply	other threads:[~2016-05-09 22:09 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-09 20:45 [PATCH v5 00/12] x86/xsaves: Fix XSAVES issues Yu-cheng Yu
2016-05-09 20:45 ` [PATCH v5 01/13] x86/xsaves: Define and use user_xstate_size for xstate size in signal context Yu-cheng Yu
2016-05-10 11:04   ` Borislav Petkov
2016-05-10 15:59     ` Yu-cheng Yu
2016-05-10 16:29       ` Borislav Petkov
2016-05-10 16:30         ` Yu-cheng Yu
2016-05-09 20:45 ` [PATCH v5 02/13] x86/xsaves: Rename xstate_size to kernel_xstate_size to explicitly distinguish xstate size in kernel from user space Yu-cheng Yu
2016-05-10 17:01   ` Borislav Petkov
2016-05-10 17:08     ` Dave Hansen
2016-05-10 17:26       ` Borislav Petkov
2016-05-10 17:31         ` Dave Hansen
2016-05-09 20:46 ` [PATCH v5 03/13] x86/xsaves: Keep init_fpstate.xsave.header.xfeatures as zero for init optimization Yu-cheng Yu
2016-05-09 20:46 ` [PATCH v5 04/13] x86/xsaves: Introduce a new check that allows correct xstates copy from kernel to user directly Yu-cheng Yu
2016-05-09 22:09   ` Dave Hansen [this message]
2016-05-09 20:46 ` [PATCH v5 05/13] x86/xsaves: Align xstate components according to CPUID Yu-cheng Yu
2016-05-09 20:46 ` [PATCH v5 06/13] x86/xsaves: Supervisor state component offset Yu-cheng Yu
2016-05-09 20:46 ` [PATCH v5 07/13] x86/xsaves: Fix PTRACE frames for XSAVES Yu-cheng Yu
2016-05-09 20:46 ` [PATCH v5 08/13] x86/xsaves: Fix XSTATE component offset print out Yu-cheng Yu
2016-05-09 20:46 ` [PATCH v5 09/13] x86/xsaves: Fix xstate_offsets, xstate_sizes for non-extended states Yu-cheng Yu
2016-05-09 20:46 ` [PATCH v5 10/13] x86/xsaves: Fix __fpu_restore_sig() for XSAVES Yu-cheng Yu
2016-05-09 23:43   ` Dave Hansen
2016-05-09 20:46 ` [PATCH v5 11/13] x86/xsaves: Add WARN_ON_FPU() when a disabled xstate component offset is requested for a compacted format Yu-cheng Yu
2016-05-09 23:31   ` Dave Hansen
2016-05-09 23:44     ` Yu-cheng Yu
2016-05-09 23:54       ` Dave Hansen
2016-05-09 20:46 ` [PATCH v5 12/13] x86/xsaves: Fix fpstate_init() for XSAVES Yu-cheng Yu
2016-05-09 23:41   ` Dave Hansen
2016-05-09 23:50     ` Yu-cheng Yu
2016-05-10  0:01       ` Dave Hansen
2016-05-09 20:46 ` [PATCH v5 13/13] x86/xsaves: Re-enable XSAVES Yu-cheng Yu

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