netdev - Re: [PATCH net] ipv6: drop non loopback packets claiming to originate from ::1

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Message-ID: <1492197032.10587.79.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Fri, 14 Apr 2017 12:10:32 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Florian Westphal <fw@...len.de>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net] ipv6: drop non loopback packets claiming to
 originate from ::1

On Fri, 2017-04-14 at 20:22 +0200, Florian Westphal wrote:
> We lack a saddr check for ::1. This causes security issues e.g. with acls
> permitting connections from ::1 because of assumption that these originate
> from local machine.
> 
> Assuming a source address of ::1 is local seems reasonable.
> RFC4291 doesn't allow such a source address either, so drop such packets.
> 
> Reported-by: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Florian Westphal <fw@...len.de>
> ---
>  net/ipv6/ip6_input.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)

Acked-by: Eric Dumazet <edumazet@...gle.com>