linux-kernel - Re: KVM induced panic on 2.6.38[2367] & 2.6.39

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] [thread-next>] [day] [month] [year] [list]

Message-ID: <4DEE27DE.7060004@trash.net>
Date:	Tue, 07 Jun 2011 15:30:06 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Brad Campbell <brad@...rfbargle.com>
CC:	Bart De Schuymer <bdschuym@...dora.be>, kvm@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: KVM induced panic on 2.6.38[2367] & 2.6.39

On 07.06.2011 05:33, Brad Campbell wrote:
> On 07/06/11 04:10, Bart De Schuymer wrote:
>> Hi Brad,
>>
>> This has probably nothing to do with ebtables, so please rmmod in case
>> it's loaded.
>> A few questions I didn't directly see an answer to in the threads I
>> scanned...
>> I'm assuming you actually use the bridging firewall functionality. So,
>> what iptables modules do you use? Can you reduce your iptables rules to
>> a core that triggers the bug?
>> Or does it get triggered even with an empty set of firewall rules?
>> Are you using a stock .35 kernel or is it patched?
>> Is this something I can trigger on a poor guy's laptop or does it
>> require specialized hardware (I'm catching up on qemu/kvm...)?
> 
> Not specialised hardware as such, I've just not been able to reproduce
> it outside of this specific operating scenario.

The last similar problem we've had was related to the 32/64 bit compat
code. Are you running 32 bit userspace on a 64 bit kernel?

> I can't trigger it with empty firewall rules as it relies on a DNAT to
> occur. If I try it directly to the internal IP address (as I have to
> without netfilter loaded) then of course nothing fails.
> 
> It's a pain in the bum as a fault, but it's one I can easily reproduce
> as long as I use the same set of circumstances.
> 
> I'll try using 3.0-rc2 (current git) tonight, and if I can reproduce it
> on that then I'll attempt to pare down the IPTABLES rules to a bare
> minimum.
> 
> It is nothing to do with ebtables as I don't compile it. I'm not really
> sure about "bridging firewall" functionality. I just use a couple of
> hand coded bash scripts to set the tables up.

>From one of your previous mails:

> # CONFIG_BRIDGE_NF_EBTABLES is not set

How about CONFIG_BRIDGE_NETFILTER?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/