Date: Tue, 11 Mar 2014 18:09:32 +0100 From: Petr Matousek <pmatouse@...hat.com> To: Chris Palmer <snackypants@...il.com> Cc: oss-security@...ts.openwall.com Subject: Re: CVE-2014-0131 -- kernel: net: use-after-free during segmentation with zerocopy On Tue, Mar 11, 2014 at 09:50:45AM -0700, Chris Palmer wrote: > 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). Correct. > 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? The after-free-user is a reader, not a writer. > 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 > > -- Petr Matousek / Red Hat Security Response Team PGP: 0xC44977CA 8107 AF16 A416 F9AF 18F3 D874 3E78 6F42 C449 77CA
Powered by blists - more mailing lists
Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.
Powered by Openwall GNU/*/Linux - Powered by OpenVZ