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: <20150320144720.GW27066@moon>
Date:	Fri, 20 Mar 2015 17:47:20 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Denys Vlasenko <vda.linux@...glemail.com>,
	Andy Lutomirski <luto@...capital.net>,
	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, Mar 20, 2015 at 03:07:38PM +0100, Oleg Nesterov wrote:
> 
> Another downside (to me) is that this special case can help, but only
> "by accident".
> 
> For example, criu has ->ss = 0, but it was not initialized explicitly.
> 
> But as I said, I won't argue.

OK, after talking to Pavel -- it's fine to require new criu version
for new kernels, thus lets leave kernel pure without this special
hack, moreover now we have a fix from Oleg merged into criu so we
should be safe. Thanks a lot for all comments!
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