From: Benjamin LaHaise <bcrl@redhat.com>
To: Ingo Oeser <ingo.oeser@informatik.tu-chemnitz.de>
Cc: linux-mm@kvack.org
Subject: Re: Usage of get_user_pages() in fs/aio.c
Date: Thu, 7 Nov 2002 14:46:25 -0500 [thread overview]
Message-ID: <20021107144625.B30214@redhat.com> (raw)
In-Reply-To: <20021106211538.M659@nightmaster.csn.tu-chemnitz.de>; from ingo.oeser@informatik.tu-chemnitz.de on Wed, Nov 06, 2002 at 09:15:38PM +0100
On Wed, Nov 06, 2002 at 09:15:38PM +0100, Ingo Oeser wrote:
> What this can cause is clear ;-)
>
> Simple fix would be to replace "info->mmap_size" with "nr_pages",
> that you compute just some lines above.
Whoops. Yeah, that's a bug. It hasn't actually been noticed in
testing because the array of pages is freshly allocated from mmap
and thus stops filling the array at nr_pages, but it could be
exploited by a hostile user. I'll feed that patch up asap.
-ben
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prev parent reply other threads:[~2002-11-07 19:46 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-06 20:15 Usage of get_user_pages() in fs/aio.c Ingo Oeser
2002-11-07 19:46 ` Benjamin LaHaise [this message]
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