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Date: Wed, 4 Dec 2013 11:26:42 +0100
From: Petr Matousek <>
To: Linus Torvalds <>
Cc: Greg Kroah-Hartman <>,
        "Hans J. Koch" <>,
        Nico Golde <>,,
        "" <>,
        Dan Carpenter <>
Subject: Re: kernel: uio: CVE-2013-6763 [was: Re: some
 unstracked linux kernel security fixes]

On Mon, Dec 02, 2013 at 07:44:53PM -0800, Linus Torvalds wrote:
> On Mon, Dec 2, 2013 at 7:40 PM, Greg Kroah-Hartman
> <> wrote:
> > On Tue, Nov 26, 2013 at 01:18:39PM +0100, Petr Matousek wrote:
> >> >
> >> > IOW, with the current changes, isn't the functionality broken for
> >> > non page-aligned addr and/or size?
> >
> > This should now be fixed in Linus's tree, right?
> Well, that depends on what you mean by "fixed".

I was going to say no, but then saw b6550287.

Just for the record, the CVE-2013-6763 fix consists of

  * uio part of 7314e613
  * b6550287

> If somebody depended on "we'll just mmap the page(s) that contained
> the partial and unaligned resource", then current git is very very
> broken, because it doesn't allow that at all.

Intuitively I'd assume that the rounding up in uio_mmap is there for a
reason, but what do I know.

Petr Matousek / Red Hat Security Response Team
PGP: 0xC44977CA 8107 AF16 A416 F9AF 18F3  D874 3E78 6F42 C449 77CA

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