[PATCH] cifs: Workaround a probable Samba case sensitivity bug

Shirish Pargaonkar shirishpargaonkar at gmail.com
Sat Jul 26 09:44:30 MDT 2014

I posted that patch.



On Fri, Jul 25, 2014 at 7:23 PM, Alexander Perlis <aperlis at math.lsu.edu> wrote:
> On Jun 22, Shirish Pargaonkar wrote:
>> When a client supports extended security but server does not,
>> and that client, in Flags2 field of smb header indicates that
>> - it supports extended security negotiation
>> - it does not support security signatures
>> - it does not require security signatures
>> Samba server treats a client as a Vista client.
>> That turns off case sensitivity and that is a problem for
>> cifs vfs client.
> I can report that this bug is affecting folks in production environments. It
> seems a newer version of the kernel cifs client code is reporting
> capabilities that are confusing the Samba server into turning off case
> sensitivity, which breaks a lot of stuff.
> For example, on our Samba server we have "case sensitive = Auto" because we
> have both Linux and Windows clients. Our older Linux clients running Kubuntu
> 10.04 indeed obtain the desired case sensitive connections, but when we try
> to upgrade a client to Kubuntu 12.04 with the 14.04 LTS enablement stack,
> the mounts suddenly become case insensitive, after which it's not too hard
> to confuse the client into dropping the "serverino" flag on the connection
> (manually you can do "mkdir Test; cd tesT"), after which KDE locking code
> goes bonkers.
> In the referenced post,
>  https://lists.samba.org/archive/samba-technical/2014-June/100697.html
> Shirish Pargaonkar included a one-line patch to the Samba server negprot.c
> code that fixes this bug.
> No one replied, so unclear whether it got missed? What's the procedure to
> get that fix into the Samba codebase? Is reporting on this list sufficient,
> or does a separate bug report need to be entered somewhere into a bug
> tracking system?
> Thanks,
> Alex

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