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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190820053607.GL2588@breakpoint.cc \
--to=fw@strlen.de \
--cc=coreteam@netfilter.org \
--cc=davem@davemloft.net \
--cc=kadlec@netfilter.org \
--cc=leonardo@linux.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=netfilter-devel@vger.kernel.org \
--cc=pablo@netfilter.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).