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From: Andy Lutomirski <luto@amacapital.net>
Date: Thu, 15 May 2014 15:15:32 -0700
Message-ID: <CALCETrUTM7ZJrWvWa4bHi0RSFhzAZu7+z5XHbJuP+==Cd8GRqw@mail.gmail.com>
Subject: Re: mm: NULL ptr deref handling mmaping of special mappings
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To: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, Sasha Levin <sasha.levin@oracle.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>, Dave Jones <davej@redhat.com>, LKML <linux-kernel@vger.kernel.org>, Pavel Emelyanov <xemul@parallels.com>

On Thu, May 15, 2014 at 2:57 PM, Cyrill Gorcunov <gorcunov@gmail.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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