linux-kernel - Re: [PATCH v3 1/2] x86_64,signal: Fix SS handling for signals delivered to 64-bit programs

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Message-ID: <CALCETrWs5LZa5r=PicCEWyxZijdAThwAo54s7-UFUE31CRs6AQ@mail.gmail.com>
Date:	Fri, 10 Apr 2015 15:16:18 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Andrey Wagin <avagin@...il.com>,
	Andy Lutomirski <luto@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andi Kleen <andi@...stfloor.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Al Viro <viro@...iv.linux.org.uk>, X86 ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: [PATCH v3 1/2] x86_64,signal: Fix SS handling for signals
 delivered to 64-bit programs

On Fri, Apr 10, 2015 at 3:11 PM, Cyrill Gorcunov <gorcunov@...il.com> wrote:
> On Fri, Apr 10, 2015 at 02:59:19PM -0700, Andy Lutomirski wrote:
>>
>> As long as you're doing that, any chance you could remove CPREG1(gs)
>> and CPREG1(fs) as well?  They haven't had any effect since
>> 2.5.something_very_old, and the kernel might want to reuse those
>> sigcontext slots some day.
>
> Yeah, absolutely. I'm implementing 32bits support for criu now
> so I managed to postprone this task but will implement on the
> week. Thanks for reminder!

Yikes, have fun with that.  I think there's a major vdso issue you'll
hit.  Make sure you test on Intel hardware.  I'll try to help if you
find stuff in my areas of the kernel.

--Andy

-- 
Andy Lutomirski
AMA Capital Management, LLC
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