oss-security - CVE request: kernel: ipv6: make fragment identifications less predictable

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Message-ID: <4E267FCF.6030003@redhat.com>
Date: Wed, 20 Jul 2011 15:12:15 +0800
From: Eugene Teo <eugene@...hat.com>
To: oss-security@...ts.openwall.com
CC: "Steven M. Christey" <coley@...us.mitre.org>
Subject: CVE request: kernel: ipv6: make fragment identifications less predictable

IPv6 fragment identification generation is way beyond what we use for
IPv4 : It uses a single generator. Its not scalable and allows DoS attacks.

Now inetpeer is IPv6 aware, we can use it to provide a more secure and
scalable frag ident generator (per destination, instead of system wide)

This patch :
1) defines a new secure_ipv6_id() helper
2) extends inet_getid() to provide 32bit results
3) extends ipv6_select_ident() with a new dest parameter

http://thread.gmane.org/gmane.linux.network/201773/focus=201776
https://bugzilla.redhat.com/show_bug.cgi?id=723429

Thanks, Eugene

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