From: Florian Westphal <fw@strlen.de>
To: Leonardo Bras <leonardo@linux.ibm.com>
Cc: netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Pablo Neira Ayuso <pablo@netfilter.org>,
Jozsef Kadlecsik <kadlec@netfilter.org>,
Florian Westphal <fw@strlen.de>,
"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH 1/1] netfilter: nf_tables: fib: Drop IPV6 packages if IPv6 is disabled on boot
Date: Tue, 20 Aug 2019 07:36:07 +0200 [thread overview]
Message-ID: <20190820053607.GL2588@breakpoint.cc> (raw)
In-Reply-To: <20190820005821.2644-1-leonardo@linux.ibm.com>
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 package, 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
>
> Fix this behavior by dropping IPv6 packages if !ipv6_mod_enabled().
Wouldn't fib_netdev.c have the same problem?
If so, might be better to place this test in both
nft_fib6_eval_type and nft_fib6_eval.
next prev parent reply other threads:[~2019-08-20 5:36 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-20 0:58 [PATCH 1/1] netfilter: nf_tables: fib: Drop IPV6 packages if IPv6 is disabled on boot Leonardo Bras
2019-08-20 5:36 ` Florian Westphal [this message]
2019-08-20 16:15 ` Leonardo Bras
2019-08-21 9:58 ` Pablo Neira Ayuso
2019-08-21 14:14 ` Leonardo Bras
2019-08-26 16:47 ` Leonardo Bras
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