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From: Pablo Neira Ayuso <pablo@netfilter.org>
To: Leonardo Bras <leonardo@linux.ibm.com>
Cc: netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
	bridge@lists.linux-foundation.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org, FlorianWestphal <fw@strlen.de>,
	Jozsef Kadlecsik <kadlec@netfilter.org>,
	Roopa Prabhu <roopa@cumulusnetworks.com>,
	Nikolay Aleksandrov <nikolay@cumulusnetworks.com>,
	"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH v4 1/2] netfilter: Terminate rule eval if protocol=IPv6 and ipv6 module is disabled
Date: Tue, 3 Sep 2019 18:49:48 +0200	[thread overview]
Message-ID: <20190903164948.kuvtpy7viqhcmp77@salvia> (raw)
In-Reply-To: <99e3ef9c5ead1c95df697d49ab9cc83a95b0ac7c.camel@linux.ibm.com>

On Tue, Sep 03, 2019 at 01:46:50PM -0300, Leonardo Bras wrote:
> On Fri, 2019-08-30 at 22:58 +0200, Florian Westphal wrote:
> > Leonardo Bras <leonardo@linux.ibm.com> wrote:
> > > If IPv6 is disabled on boot (ipv6.disable=1), but nft_fib_inet ends up
> > > dealing with a IPv6 packet, it causes a kernel panic in
> > > fib6_node_lookup_1(), crashing in bad_page_fault.
> > > 
> > > The panic is caused by trying to deference a very low address (0x38
> > > in ppc64le), due to ipv6.fib6_main_tbl = NULL.
> > > BUG: Kernel NULL pointer dereference at 0x00000038
> > > 
> > > The kernel panic was reproduced in a host that disabled IPv6 on boot and
> > > have to process guest packets (coming from a bridge) using it's ip6tables.
> > > 
> > > Terminate rule evaluation when packet protocol is IPv6 but the ipv6 module
> > > is not loaded.
> > > 
> > > Signed-off-by: Leonardo Bras <leonardo@linux.ibm.com>
> > 
> > Acked-by: Florian Westphal <fw@strlen.de>
> > 
> 
> Hello Pablo,
> 
> Any trouble with this patch? 
> I could see the other* one got applied, but not this one.
> *(The other did not get acked, so i released it alone as v5)
> 
> Is there any fix I need to do in this one?

Hm, I see, so this one:

https://patchwork.ozlabs.org/patch/1156100/

is not enough?

I was expecting we could find a way to handle this from br_netfilter
alone itself.

Thanks.

  reply	other threads:[~2019-09-03 16:49 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-30 18:13 [PATCH v4 0/2] Drop IPV6 packets if IPv6 is disabled on boot Leonardo Bras
2019-08-30 18:13 ` [PATCH v4 1/2] netfilter: Terminate rule eval if protocol=IPv6 and ipv6 module is disabled Leonardo Bras
2019-08-30 20:58   ` Florian Westphal
2019-09-03 16:46     ` Leonardo Bras
2019-09-03 16:49       ` Pablo Neira Ayuso [this message]
2019-09-03 16:56         ` Leonardo Bras
2019-09-03 17:05         ` Florian Westphal
2019-09-03 19:31           ` Pablo Neira Ayuso
2019-09-03 19:48             ` Florian Westphal
2019-09-03 20:19               ` Pablo Neira Ayuso
2019-09-03 20:35                 ` Florian Westphal
2019-09-03 20:55                   ` Pablo Neira Ayuso
2019-09-03 20:55   ` Pablo Neira Ayuso
2019-08-30 18:13 ` [PATCH v4 2/2] net: br_netfiler_hooks: Drops IPv6 packets if IPv6 module is not loaded Leonardo Bras
2019-08-30 20:55   ` Florian Westphal
2019-08-31  4:42     ` Leonardo Bras
2019-08-31  8:43       ` Florian Westphal

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