lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <20190903205534.bxcty7pja5bvru5f@salvia>
Date:   Tue, 3 Sep 2019 22:55:34 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Leonardo Bras <leonardo@...ux.ibm.com>
Cc:     netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v4 1/2] netfilter: Terminate rule eval if protocol=IPv6
 and ipv6 module is disabled

On Fri, Aug 30, 2019 at 03:13:53PM -0300, Leonardo Bras 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.

Patch is applied, thanks.

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ