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Date: Wed, 24 Jul 2013 01:45:26 +0530 (IST)
From: P J P <>
To: oss security list <>
Subject: Re: CVE request: Linux kernel: panic while appending
 data to a corked IPv6 socket in ip6_append_data_mtu

+-- On Tue, 23 Jul 2013, Seth Arnold wrote --+
| UDP_CORKED? I don't see this string in my /usr/include/ or recent Linux git 
| tree. 
| Am I missing something?

  It's one of those non-portable Linux socket options.

$ man 7 udp 
 UDP_CORK (since Linux 2.5.44)
              If  this  option is enabled, then all data output on this socket
              is accumulated into a single datagram that is  transmitted  when
              the  option is disabled.  This option should not be used in code
              intended to be portable.

Though the crash is more of due to IPV6_MTU value set. (from commit log)

Prasad J Pandit / Red Hat Security Response Team
DB7A 84C5 D3F9 7CD1 B5EB  C939 D048 7860 3655 602B

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