oss-security - CVE request -- kernel: net: potential information leak when ubuf backed skbs are skb

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Message-ID: <20140320182032.GC20297@dhcp-25-225.brq.redhat.com>
Date: Thu, 20 Mar 2014 19:20:32 +0100
From: Petr Matousek <pmatouse@...hat.com>
To: oss-security@...ts.openwall.com
Cc: zoltan.kiss@...rix.com, Michael Tsirkin <mtsirkin@...hat.com>
Subject: CVE request -- kernel: net: potential information leak when ubuf
 backed skbs are skb_zerocopy()ied

An information flaw was found in the way skb_zerocopy() copied skbs that
are backed by userspace buffers (for example vhost-net and recent xen
netback). Once the source skb is consumed, ubuf destructor is called and
potentially releases the corresponding userspace buffers, which can then
for example be repurposed, while the destination skb is still pointing
to the them.

This issue is similar to CVE-2014-0131.

Upstream patch:
https://lkml.org/lkml/2014/3/20/421

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

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