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From: "Oliver Pinter" <oliver.pntr@gmail.com>
To: "Willy Tarreau" <w@1wt.eu>
Cc: "Pekka J Enberg" <penberg@cs.helsinki.fi>,
	torvalds@linux-foundation.org, linux-kernel@vger.kernel.org,
	stable@kernel.org, jens.axboe@oracle.com,
	akpm@linux-foundation.org, bastian@waldi.eu.org,
	ndenev@gmail.com
Subject: Re: [PATCH] splice: fix user pointer access in get_iovec_page_array()
Date: Mon, 11 Feb 2008 07:24:14 +0100	[thread overview]
Message-ID: <6101e8c40802102224q7d99da65we2b7b95e39453c51@mail.gmail.com> (raw)
In-Reply-To: <20080210233703.GR8953@1wt.eu>

Linux pancs 2.6.22.17-opt2-cve2 #1 SMP Sun Feb 10 16:22:37 CET 2008
i686 GNU/Linux
-----------------------------------
 Linux vmsplice Local Root Exploit
 By qaaz
-----------------------------------
[+] mmap: 0x0 .. 0x1000
[+] page: 0x0
[+] page: 0x20
[+] mmap: 0x4000 .. 0x5000
[+] page: 0x4000
[+] page: 0x4020
[+] mmap: 0x1000 .. 0x2000
[+] page: 0x1000
[+] mmap: 0xb7f95000 .. 0xb7fc7000
[-] vmsplice: Bad address
-----------------------------------
 Linux vmsplice Local Root Exploit
 By qaaz
-----------------------------------
[+] addr: 0xc01112e9
[-] wtf

the patch is good for 2.6.22.y

On 2/11/08, Willy Tarreau <w@1wt.eu> wrote:
> On Sun, Feb 10, 2008 at 04:47:57PM +0200, Pekka J Enberg wrote:
> > From: Bastian Blank <bastian@waldi.eu.org>
> >
> > The commit 8811930dc74a503415b35c4a79d14fb0b408a361 ("splice: missing user
> > pointer access verification") added access_ok() to
> copy_from_user_mmap_sem()
> > which only ensures we can copy the struct iovecs from userspace to the
> kernel
> > but we also must check whether we can access the actual memory region
> pointed
> > to by the struct iovec to close the local root exploit.
> >
> > Cc: <stable@kernel.org>
> > Cc: Jens Axboe <jens.axboe@oracle.com>
> > Cc: Andrew Morton <akpm@linux-foundation.org>
> > Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
> > ---
> > Bastian, can I have your Signed-off-by for this, please? Oliver, Niki, can
> > you please confirm this closes the hole?
>
> Pekka, I confirm that it also closes the hole once backported to 2.6.22.
>
> Willy
>
>


-- 
Thanks,
Oliver

  reply	other threads:[~2008-02-11  6:24 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-10 14:47 Pekka J Enberg
2008-02-10 15:17 ` Bastian Blank
2008-02-10 15:31   ` Oliver Pinter
2008-02-10 23:37 ` Willy Tarreau
2008-02-11  6:24   ` Oliver Pinter [this message]
2008-02-11  7:29 ` [PATCH] vmsplice exploit fix (was: splice: fix user pointer access in get_iovec_page_array) Daniel Phillips
2008-02-11  7:49   ` Pekka Enberg
2008-02-11  8:00     ` Daniel Phillips
2008-02-11  7:53   ` [stable] " Greg KH
2008-02-11  8:05     ` Daniel Phillips

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