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CVE Request: kernel: ipv6: using ipv4 vs ipv6 structure during routing lookup in sendmsg
From: Marcus Meissner <meissner () suse de>
Date: Tue, 2 Jul 2013 11:14:40 +0200

Hi,

Also fresh in the mainline kernel and spotted by trinity:

commit a963a37d384d71ad43b3e9e79d68d42fbe0901f3
Author: Eric Dumazet <edumazet () google com>
Date:   Wed Jun 26 04:15:07 2013 -0700

    ipv6: ip6_sk_dst_check() must not assume ipv6 dst

    It's possible to use AF_INET6 sockets and to connect to an IPv4
    destination. After this, socket dst cache is a pointer to a rtable,
    not rt6_info.

    ip6_sk_dst_check() should check the socket dst cache is IPv6, or else
    various corruptions/crashes can happen.

    Dave Jones can reproduce immediate crash with
    trinity -q -l off -n -c sendmsg -c connect

    With help from Hannes Frederic Sowa

    Reported-by: Dave Jones <davej () redhat com>
    Reported-by: Hannes Frederic Sowa <hannes () stressinduktion org>
    Signed-off-by: Eric Dumazet <edumazet () google com>
    Acked-by: Hannes Frederic Sowa <hannes () stressinduktion org>
    Signed-off-by: David S. Miller <davem () davemloft net>


Can be triggered by non-root users according to Eric, so needs a CVE.

Ciao, Marcus


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