linux-kernel - Re: vdso && cr

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Message-ID: <20121126144155.GA16404@moon>
Date:	Mon, 26 Nov 2012 18:41:55 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Amnon Shiloh <u3557@...o.sublimeip.com>
Cc:	Andrey Wagin <avagin@...il.com>, Oleg Nesterov <oleg@...hat.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: vdso && cr

On Tue, Nov 27, 2012 at 01:26:55AM +1100, Amnon Shiloh wrote:
> Programmers don't (and the manual-page says they shouldn't even try)
> call "sigreturn" directly.
> 
> If an interrupt happens, by bad luck, to occur while the process
> is running vdso code, then eventually, once signal-processing is
> complete, "sigreturn" (issued by  glibc) will take the process back
> to where it was before the interrupt happend, inside the vdso page.

Hi Amnon, good point, need to think. Frankly I would like to escape
kernel patching as long as possible ;)
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