linux-kernel - Re: vdso && cr (Was: arch_check_bp_in

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Date:	Mon, 26 Nov 2012 18:18:43 +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 (Was: arch_check_bp_in_kernelspace: fix the range
 check)

On Mon, Nov 26, 2012 at 11:55:01PM +1100, Amnon Shiloh wrote:
> 
> You could of course keep that old code and modify only the very
> first instruction of each routine into a jump instruction, but then
> the code to which the process returns may not be compatible with
> the new kernel and/or hardware configuration.

For sure there will be some limitations but I fear we can't do
that much with it. I don't expect the regular program to use
sigreturn for jumping into vdso code, but I could be wrong.

	Cyrill
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