[Samba] FreeBSD samba server returns nt_status_acces_denied when DosStream xattr larger than 64KB

[Andrew Walker]

Hi Ralph,
I just looked through the WIP patch regarding xattr size and noticed a
couple of things:
1) On a sample of around 10K DosStream xattrs from my server, I saw a large
number that were greater than 256 bytes and less than 512 bytes (probably
OSX-related). Is it reasonable to perhaps bump the optimization up to 512
bytes?
2) Won't you also have to increase to 64MB in fill_ea_buffer() as well in
trans2.c?

Best,
Andrew

On Sun, Nov 5, 2017 at 3:07 AM, Ralph Böhme <slow at samba.org> wrote:

> 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/
>