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

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Message-Id: <20140514143124.52c598a2ba8e2539ee76558c@linux-foundation.org>
Date:	Wed, 14 May 2014 14:31:24 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Dave Jones <davej@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: mm: NULL ptr deref handling mmaping of special mappings

On Wed, 14 May 2014 17:11:00 -0400 Sasha Levin <sasha.levin@...cle.com> wrote:

> > In my linux-next all that code got deleted by Andy's "x86, vdso:
> > Reimplement vdso.so preparation in build-time C" anyway.  What kernel
> > were you looking at?
> 
> Deleted? It appears in today's -next. arch/x86/vdso/vma.c:124 .
> 
> I don't see Andy's patch removing that code either.

ah, OK, it got moved from arch/x86/vdso/vdso32-setup.c into
arch/x86/vdso/vma.c.

Maybe you managed to take a fault against the symbol area between the
_install_special_mapping() and the remap_pfn_range() call, but mmap_sem
should prevent that.

Or the remap_pfn_range() call never happened.  Should map_vdso() be
running _install_special_mapping() at all if
image->sym_vvar_page==NULL?
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