samba - Nov 2017 - FreeBSD samba server returns nt_status_acces_denied when DosStream xattr larger than 64KB

On Mon, Aug 07, 2017 at 08:26:22PM -0500, Andrew Walker via samba
wrote:
> It's also interesting to note that ReFS in windows has a 128KB limit on
the
> size of alternate data streams.
> 
> When you try to write an overly large stream, the ReFS-backed server
> replies with "NT_STATUS_FILE_SYSTEM_LIMITATION" (0xc0000427)
rather than
> "access denied". The windows client handles this more gracefully
than a
> simple access denied message. It allows users to skip the file /
doesn't
> pop up a password prompt.
oh, that's interesting. Can you please file a bugreport and assign it to me
so
we can keep track of this? Thanks!

Cheerio!
-slow

On Wed, Aug 9, 2017 at 7:37 AM, Ralph Böhme <slow at samba.org> wrote:
> On Mon, Aug 07, 2017 at 08:26:22PM -0500, Andrew Walker via samba wrote:
> > It's also interesting to note that ReFS in windows has a 128KB
limit on
> the
> > size of alternate data streams.
> >
> > When you try to write an overly large stream, the ReFS-backed server
> > replies with "NT_STATUS_FILE_SYSTEM_LIMITATION" (0xc0000427)
rather than
> > "access denied". The windows client handles this more
gracefully than a
> > simple access denied message. It allows users to skip the file /
doesn't
> > pop up a password prompt.
>
> oh, that's interesting. Can you please file a bugreport and assign it
to
> me so
> we can keep track of this? Thanks!
>
> Cheerio!
> -slow
>
Sorry for the late reply. I submitted a request for permission to submit a
bug report about this. It was rather meta.

Would you like me to use wireshark to get packet captures of Windows and
Mac clients trying to write large streams to a ReFS-backed Windows share? I
might not be able to set up a test environment to do this for a couple of
weeks.

Andrew

On Tue, Aug 15, 2017 at 07:08:40AM -0500, Andrew Walker via samba
wrote:
> On Wed, Aug 9, 2017 at 7:37 AM, Ralph Böhme <slow at samba.org>
wrote:
> 
> > On Mon, Aug 07, 2017 at 08:26:22PM -0500, Andrew Walker via samba
wrote:
> > > It's also interesting to note that ReFS in windows has a
128KB limit on
> > the
> > > size of alternate data streams.
> > >
> > > When you try to write an overly large stream, the ReFS-backed
server
> > > replies with "NT_STATUS_FILE_SYSTEM_LIMITATION"
(0xc0000427) rather than
> > > "access denied". The windows client handles this more
gracefully than a
> > > simple access denied message. It allows users to skip the file /
doesn't
> > > pop up a password prompt.
> >
> > oh, that's interesting. Can you please file a bugreport and assign
it to
> > me so
> > we can keep track of this? Thanks!
> >
> > Cheerio!
> > -slow
> >
> 
> Sorry for the late reply. I submitted a request for permission to submit a
> bug report about this. It was rather meta.
> 
> Would you like me to use wireshark to get packet captures of Windows and
> Mac clients trying to write large streams to a ReFS-backed Windows share? I
> might not be able to set up a test environment to do this for a couple of
> weeks.
I created

https://bugzilla.samba.org/show_bug.cgi?id=13119

to track this.

-slow

-- 
Ralph Boehme, Samba Team       https://samba.org/
Samba Developer, SerNet GmbH   https://sernet.de/en/samba/