linux-kernel - Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit?

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Date:	Fri, 18 Dec 2015 08:56:51 -0800
From:	Dave Hansen <dave.hansen@...ux.intel.com>
To:	Andy Lutomirski <luto@...capital.net>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
	Brian Gerst <brgerst@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Hellwig <hch@....de>
Subject: Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit?

On 12/18/2015 08:04 AM, Andy Lutomirski wrote:
> Which reminds me: __get_user, etc all respect PKRU because the SDM
> says that PKRU affects all user *and* kernel accesses to user memory
> (i.e. anything with _PAGE_USER).  Should get_user_pages also respect
> PKRU?

It does.  There are a couple of parts to it, but the most important are
in these patches:

> http://git.kernel.org/cgit/linux/kernel/git/daveh/x86-pkeys.git/commit/?h=pkeys-v018&id=c64acbe036487d07968ea6a5b9090169d6e40160
> http://git.kernel.org/cgit/linux/kernel/git/daveh/x86-pkeys.git/commit/?h=pkeys-v018&id=331c62eb789f969e187964e28ac80b1e0e26b69d


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