netdev - Re: BUG: 4.14.11 unable to handle kernel NULL pointer dereference in xfrm

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: <20180109092624.2x6fjw3xt3axrrzo@gauss3.secunet.de>
Date:   Tue, 9 Jan 2018 10:26:24 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Tobias Hommel <netdev-list@...oetigt.de>
CC:     <netdev@...r.kernel.org>
Subject: Re: BUG: 4.14.11 unable to handle kernel NULL pointer dereference in
 xfrm_lookup

On Tue, Jan 09, 2018 at 10:06:51AM +0100, Tobias Hommel wrote:
> > 
> > You have CONFIG_INET_ESP_OFFLOAD enabled, this is new maybe it
> > still has some problems. You should not hit an offload codepath
> > because all your SAs are configured with UDP encapsulation which
> > is still not supported with offload.
> > 
> > Please try to disable GRO on both interfaces and see what happens:
> > 
> > ethtool -K eth0 gro off
> > ethtool -K eth1 gro off
> I actually already tried that with only eth1 off, to verify I turned offloading
> off for both interfaces. The same problem: see attached panic.gro_off.log
> 
> > 
> > Then disable CONFIG_INET_ESP_OFFLOAD and try again.
> Rebuild with CONFIG_INET_ESP_OFFLOAD disabled, same problem: see attached
> panic.esp_offload_disabled.log

So ESP offload is not the problem. Next thing that comes to my mind
is the flowcache removal, this was introduced with v4.14.

> 
> > 
> > This should show us if this feature is responsible for the bug.
> > 
> 
> I will try narrowing down the problem by trying out some older kernels for now.

Thanks!

Let me know about the results.