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

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Date:	Thu, 15 May 2014 15:15:32 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Cyrill Gorcunov <gorcunov@...il.com>
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 2:57 PM, Cyrill Gorcunov <gorcunov@...il.com> wrote:
> 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).

I'll try to write a patch in time for 3.15.

--Andy
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