linux-kernel - Re: mm: NULL ptr deref handling mmaping of special mappings

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Message-ID: <20140519084022.GC2185@moon>
Date:	Mon, 19 May 2014 12:40:22 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: mm: NULL ptr deref handling mmaping of special mappings

On Mon, May 19, 2014 at 12:27:29PM +0400, Pavel Emelyanov wrote:
> > 
> > What happens if you try to checkpoint a program that's in the vdso or,
> > worse, in a signal frame with the vdso on the stack?
> 
> Nothing good, unfortunately :( And this is one of the things we're investigating.
> Cyrill can shed more light on it, as he's the one in charge.

vdso on stack should not be a big deal, because we keep original vdso proxy.
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