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

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Message-ID: <56747360.3040909@zytor.com>
Date:	Fri, 18 Dec 2015 12:58:08 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Dave Hansen <dave.hansen@...ux.intel.com>,
	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>,
	Christoph Hellwig <hch@....de>
Subject: Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit?

On 12/18/2015 12:49 PM, Andy Lutomirski wrote:
> 
> IOW, I like my idea in which signal delivery always sets PKRU to the
> application-requested-by-syscall values and sigreturn restores it.
> Kinda like sigaltstack, but applies to all signals and affects PKRU
> instead of RSP.
> 

I think this is the only sensible option, with the default being all zero.

	-hpa


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