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Message-ID: <CALi+ztG4iHXeUefaW7b3JWwBEUco+emA-qC3sW+WLc_cqRyFTA@mail.gmail.com>
Date: Tue, 11 Mar 2014 09:50:45 -0700
From: Chris Palmer <snackypants@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE-2014-0131 -- kernel: net: use-after-free
during segmentation with zerocopy
It would be nice to clarify this bug description. It's a kernel memory
disclosure bug (not a memory leak in the sense of failing to collect
garbage). Although UAF is often worse than that, it's not in this case,
because there's 0 chance the after-free-user of the fragment will think the
fragment is bigger than it is and subsequently write too much data into it.
Is that right?
On Mar 10, 2014 9:41 AM, "Petr Matousek" <pmatouse@...hat.com> wrote:
> A flaw was found in the way segmentation was performed on skbs
> originated from vhost-net when zerocopy feature was enabled.
>
> This flaw could be potentially used to leak kernel memory.
>
> Upstream patch submission:
> http://marc.info/?l=linux-netdev&m=139446896921968&w=2
>
> --
> Petr Matousek / Red Hat Security Response Team
> PGP: 0xC44977CA 8107 AF16 A416 F9AF 18F3 D874 3E78 6F42 C449 77CA
>
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