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

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Message-ID: <20140515213124.GT28328@moon>
Date:	Fri, 16 May 2014 01:31:24 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Dave Jones <davej@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: Re: mm: NULL ptr deref handling mmaping of special mappings

On Fri, May 16, 2014 at 12:19:14AM +0400, Cyrill Gorcunov wrote:
> 
> I see what you mean. We're rather targeting on bare x86-64 at the moment
> but compat mode is needed as well (not yet implemented though). I'll take
> a precise look into this area. Thanks!

Indeed, because we were not running 32bit tasks vdso32-setup.c::arch_setup_additional_pages
has never been called. That's the mode we will have to implement one day.

Looking forward the question appear -- will VDSO_PREV_PAGES and rest of variables
be kind of immutable constants? If yes, we could calculate where the additional
vma lives without requiring any kind of [vdso] mark in proc/pid/maps output.
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