netdev - RE: Atheros Communications Inc. AR8121/AR8113/AR8114 Gigabit or Fast Ethernet (rev b0) 1.0.0.7 md5/sha1 corrupted using NFS and samba (updated) Version 2

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]

Date:	Sun, 24 Mar 2013 03:27:55 +0000
From:	"Huang, Xiong" <xiong@....qualcomm.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Sven Hartge <sven@...nhartge.de>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: Atheros Communications Inc. AR8121/AR8113/AR8114 Gigabit or
 Fast Ethernet (rev b0) 1.0.0.7 md5/sha1 corrupted using NFS and samba
 (updated) Version 2

Could you point me where the patch is ? 
I checked windows driver, it doesn't disable checksum offload in RX direction.

Thanks
Xiong

> -----Original Message-----
> From: Hannes Frederic Sowa [mailto:hannes@...essinduktion.org]
> Sent: Sunday, March 24, 2013 9:41 AM
> To: Sven Hartge
> Cc: netdev@...r.kernel.org; Jie.Yang@...eros.com; Huang, Xiong
> Subject: Re: Atheros Communications Inc. AR8121/AR8113/AR8114 Gigabit or
> Fast Ethernet (rev b0) 1.0.0.7 md5/sha1 corrupted using NFS and samba
> (updated) Version 2
> 
> On Sun, Mar 24, 2013 at 02:35:11AM +0100, Sven Hartge wrote:
> > Hannes Frederic Sowa <hannes@...essinduktion.org> wrote:
> > > On Sun, Mar 24, 2013 at 01:36:33AM +0100, Sven Hartge wrote:
> > >> Hannes Frederic Sowa <hannes@...essinduktion.org> wrote:
> > >> > On Sat, Mar 23, 2013 at 12:54:25AM -0400, rebelyouth wrote:
> > >> >> I applied your patch on my the kernel 3.7.9 and look like the
> > >> >> patch do what you said before :
> > >> >>
> > >> >> "This does not solve the real problem, which I have not yet
> > >> >> understood (wrong packets will be discarded now and will be
> hopefully resend). "
> > >> >>
> > >> >> There are errors on the RX side of the server and the speed is
> > >> >> 5~10% less but the files are ok in nfsv4 , SFTP/FTP and samba.
> > >> >>
> > >> >> Maybe the Atheros drivers for windows had a patch for the
> > >> >> checksum already in the drivers and the chipset  have some
> > >> >> hardware bug, but for me your patch is already an achievement
> > >> >> and I really thank you for your time and consideration.
> > >>
> > >> > The upstream driver (which is a tarball I found with google
> > >> > AR81Family-linux-v1.0.1.14.tar.gz) has this function ifdefed out.
> > >> > I have a couple of more things I want to test as soon as I have
> > >> > access to the hardware again.  If I don't find a better solution
> > >> > I will submit a patch which disables rx checksumming as a whole for
> inclusion to net-next.
> > >>
> > >> I remember having the some problem with an atl1e chip on my Asus
> > >> PQ5-Pro. It would corrupt ethernet frames, resulting in dropped
> > >> connections when using SSH (bailing out with a HMAC crypto error) etc.
> > >>
> > >> After some conversations with an Atheros engineer (Jie Yang
> > >> <Jie.Yang@...eros.com>) I got the following patch, which I applied
> > >> for some time to my local Debian kernel packages. It fixed the
> > >> problem for me, until I switched the board to a newer one.
> > >>
> > >> As far as I understand, this patch rips out any checksumming
> > >> function and just advertises the chip as not using and providing any.
> >
> > > Yes, my patch does the same, just jumpes over the body of the
> > > function and returns without updating the ip_summed field.
> >
> > >> My mail archive indicates, this bug has been fixed in the upstream
> > >> atl1e driver since version l1c-linux-v1.0.0.11-test.tar.gz.
> >
> > > Yes, they ifdefed out the body of the function.
> >
> > > What we have found so far:
> >
> > > It seems packet content overwrites itself. We have not yet found a
> > > pattern but it seems that some 16 bytes from the payload overwrite
> > > other parts of the packet, even mulitple times (but the same 16
> > > bytes though).
> >
> > > I also checked freebsd. Hardware rx checksumming is disabled there
> > > and we did not see any checksum errors in the stack. So I assume
> > > they don't have this problem.
> >
> > I understand from my conversation with Jie Yang, that he reproduced
> > the problem at Atheros and then decided to disable checksumming in the
> > driver. My guess would be that is some kind of confirmation this
> > feature is broken in that hardware and should not be used.
> 
> Added Jie Yang and Xiong Huang to Cc.
> 
> I don't know if checksumming is the cause of this problem. Perhaps the dma
> transfers get corrupted and the data was correct in the card's buffers.
> 
> Greetings,
> 
>   Hannes