linux-kernel - Re: [PATCH] mm: __nr_to_section - make it safe against overflow v2

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Message-Id: <20090106153036.1263b5ab.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 6 Jan 2009 15:30:36 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Cyrill Gorcunov <gorcunov@...il.com>, npiggin@...e.de,
	riel@...hat.com, penberg@...helsinki.fi,
	linux-kernel@...r.kernel.org, jirislaby@...il.com
Subject: Re: [PATCH] mm: __nr_to_section - make it safe against overflow v2

On Tue, 6 Jan 2009 14:57:41 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> On Mon, 5 Jan 2009 16:37:42 -0800
> Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
> > On Mon, 5 Jan 2009 13:31:32 +0300
> > Cyrill Gorcunov <gorcunov@...il.com> wrote:
> > 
> > > __nr_to_section should check for array bound overflow.
> > > We should better get NULL dereference then silently
> > > pass some memory snippet out of bounds to a caller.
> > > 
> > 
> > Are there actually any known problems here?
> > 
> 
> IIRC, I never saw any problem. (But I may see in memory-hotplug development.)

I digged mails and seems this patch is from this thread.

=
http://lkml.org/lkml/2009/1/4/61
=

He seems to want to hunt boot time failure.
(Finally, BIOS-update was necessary for original problem of this thread.)

Cyrill, could you modify this WARN_ON() works works when __nr_to_section()
is called directly by sparse.c and memhotplug.c ?

Adding WARN_ON() in pfn_to_page() is overkill.

Thanks,
-Kame

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