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

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Message-ID: <20140515215722.GU28328@moon>
Date:	Fri, 16 May 2014 01:57:22 +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 Thu, May 15, 2014 at 02:42:48PM -0700, Andy Lutomirski wrote:
> >
> > 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.
> 
> Please don't!
> 
> These might, in principle, even vary between tasks on the same system.
>  Certainly the relative positions of the vmas will be different
> between 3.15 and 3.16, since we need almost my entire cleanup series
> to reliably put them into their 3.16 location.  And I intend to change
> the number of pages in 3.16 or 3.17.

There are other ways how to find where additional pages are laying but it
would be great if there a straightforward interface for that (ie some mark
in /proc/pid/maps output).
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