[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Mathew Hodson]

** Also affects: cifs-utils (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=871779
   Importance: Unknown
   Status: Unknown

** Summary changed:

- SMB driver (SMBv2) does not show all files when mounting a windows top level 
share
+ SMBv2+ does not show all files when mounting a windows share

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  SMBv2+ does not show all files when mounting a windows share

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Kaito]

> The funny thing is you can enter or list the "hidden" folder if your
force the path.

The bug has been confirmed and there are explanations and patches but
the maintainers don't seem ready to apply it which is unfortunate as it
is a very nefarious bug (Windows 10 doesn't support SMB1.0 by default).
If you aren't aware of this bug you could mistakenly think all files of
a share are being backed up when they aren't.

https://bugzilla.samba.org/show_bug.cgi?id=13107

https://www.spinics.net/lists/linux-cifs/msg14170.html

Explanation of bug:
https://www.spinics.net/lists/linux-cifs/msg14405.html

Unfortunately I'm not sure how to apply the patches and recompile just
the cifs module.

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Thibault]

Hi all,

Experiencing the same issue under debian stable (kernel 4.9.88-1). I
opened a bugreport a few months ago with some network captures.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=871779

The funny thing is you can enter or list the "hidden" folder if your
force the path.

** Bug watch added: Debian Bug tracker #871779
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=871779

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Re: [Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Andreas Hasenack]

Do you get a notice in dmesg when you don't specify the version at mount
time?

On Fri, Apr 27, 2018, 03:05 Walter Cheuk  wrote:

> Same problem happened to Ubuntu 16.04.5. I have to specify "vers=1.0" to
> mount a NAS drive successfully. The help said the default version is
> 1.0, so I spent a lot of time to check other options. Anyone please
> update the help text.
>
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> Title:
>   SMB driver (SMBv2) does not show all files when mounting a windows top
>   level share
>
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Re: [Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Andreas Hasenack]

Do you get a notice in dmesg when you don't specify the version at mount
time?

On Fri, Apr 27, 2018, 03:05 Walter Cheuk  wrote:

> Same problem happened to Ubuntu 16.04.5. I have to specify "vers=1.0" to
> mount a NAS drive successfully. The help said the default version is
> 1.0, so I spent a lot of time to check other options. Anyone please
> update the help text.
>
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> Title:
>   SMB driver (SMBv2) does not show all files when mounting a windows top
>   level share
>
> To manage notifications about this bug go to:
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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Walter Cheuk]

Same problem happened to Ubuntu 16.04.5. I have to specify "vers=1.0" to
mount a NAS drive successfully. The help said the default version is
1.0, so I spent a lot of time to check other options. Anyone please
update the help text.

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  SMB driver (SMBv2) does not show all files when mounting a windows top
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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Andreas Hasenack]

I'm seeing files (ok, one file) disappear from a share when it's mounted
with vers=3.0. But it's not a top-level share, it's just
"c:\Shares\jsmith" on a windows 2016 server:
https://bugs.launchpad.net/ubuntu/+source/sssd/+bug/1764778/comments/15

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Andreas Hasenack]

I'm seeing files (ok, one file) disappear from a share when it's mounted
with vers=3.0. But it's not a top-level share, it's just
"c:\Shares\jsmith" on a windows 2016 server:
https://bugs.launchpad.net/ubuntu/+source/sssd/+bug/1764778/comments/15

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  SMB driver (SMBv2) does not show all files when mounting a windows top
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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Gerald Hopf]

Same problem here with uBuntu 16.04 using Kernel "4.13.0-37-generic
#42~16.04.1-Ubuntu SMP Mar 7 x86_64".

A mounted share called "D" from a Windows 10 (1709) computer has at
least one important directory just missing when mounted. I can enter the
non-existing directory manually though by cd "directoryName" and then
once inside see its contents (unsure if this listig is complete though).

This is a major bug.

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Rostislav]

In my case the files do not appear only on directory listing. I can,
however, do touch, edit, rm and other file operations, and they work
fine.

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  SMB driver (SMBv2) does not show all files when mounting a windows top
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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Javiar C]

@ahasenack   4.10.0-35-generic (buildd@lcy01-33) (gcc version 5.4.0
20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4) ) #39~16.04.1-Ubuntu SMP Wed
Sep 13 09:02:42 UTC 2017 (Ubuntu 4.10.0-35.39~16.04.1-generic 4.10.17)

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Andreas Hasenack]

@jchamp what's your kernel version?

** Bug watch added: Samba Bugzilla #13107
   https://bugzilla.samba.org/show_bug.cgi?id=13107

** Also affects: linux via
   https://bugzilla.samba.org/show_bug.cgi?id=13107
   Importance: Unknown
   Status: Unknown

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  SMB driver (SMBv2) does not show all files when mounting a windows top
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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Andreas Hasenack]

I filed a bug in bugzilla.samba.org in the CifsVFS "project", but I'm
not 100% it's the right place. I don't know if they are upstream of the
cifs code in the kernel, or if that's some old implementation that is no
longer used.

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  SMB driver (SMBv2) does not show all files when mounting a windows top
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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Andreas Hasenack]

@jchamp what's your kernel version?

** Bug watch added: Samba Bugzilla #13107
   https://bugzilla.samba.org/show_bug.cgi?id=13107

** Also affects: linux via
   https://bugzilla.samba.org/show_bug.cgi?id=13107
   Importance: Unknown
   Status: Unknown

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  SMB driver (SMBv2) does not show all files when mounting a windows top
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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Andreas Hasenack]

I filed a bug in bugzilla.samba.org in the CifsVFS "project", but I'm
not 100% it's the right place. I don't know if they are upstream of the
cifs code in the kernel, or if that's some old implementation that is no
longer used.

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  SMB driver (SMBv2) does not show all files when mounting a windows top
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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Javiar C]

I'm also experiencing this bug on Ubuntu 16.04.3.
I don't think Windows supports SMB 1.0 any longer due to security issues. 
(mount error(121): Remote I/O error)   
Adding vers=2.0 or 2.1 to the mount command line options successfully mounts 
the share, but using rsync to back up this Windows share is not reliable if it 
is missing 2 files.

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Andreas Hasenack]

This should have been moved back to "confirmed" before the expiration,
fixing that now.

** Changed in: linux (Ubuntu)
   Status: Expired => Confirmed

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Andreas Hasenack]

This should have been moved back to "confirmed" before the expiration,
fixing that now.

** Changed in: linux (Ubuntu)
   Status: Expired => Confirmed

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Launchpad Bug Tracker]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
   Status: Incomplete => Expired

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Uwe Honermann]

I checked it with the 4.12.0 kernel, Problem still exists.
I also verified the correct kernel version with uname -r.

I added the tag kernel-bug-exists-upstream.


** Tags added: kernel-bug-exists-upstream

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Uwe Honermann]

I'm not a real Linux expert, but I'll do my very best.

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Joseph Salisbury]

Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.12 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as
"Confirmed".


Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.12


** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
   Status: Confirmed => Incomplete

** Tags added: kernel-da-key

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Andreas Hasenack]

Check some debug options that can be enabled on-the-fly, taken from bug
https://bugs.launchpad.net/ubuntu/karmic/+source/linux/+bug/406466/comments/8.

In particular:

echo 1 > /proc/fs/cifs/traceSMB

showed that the missing files/directories are sent to the client when
"ls -l /mountpoint" is issued.

** Package changed: cifs-utils (Ubuntu) => linux (Ubuntu)

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Andreas Hasenack]

smbclient sees all files without issues, so I'm changing the affected
package

** Package changed: samba (Ubuntu) => cifs-utils (Ubuntu)

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Andreas Hasenack]

smbclient sees all files without issues, so I'm changing the affected
package

** Package changed: samba (Ubuntu) => cifs-utils (Ubuntu)

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Andreas Hasenack]

Check some debug options that can be enabled on-the-fly, taken from bug
https://bugs.launchpad.net/ubuntu/karmic/+source/linux/+bug/406466/comments/8.

In particular:

echo 1 > /proc/fs/cifs/traceSMB

showed that the missing files/directories are sent to the client when
"ls -l /mountpoint" is issued.

** Package changed: cifs-utils (Ubuntu) => linux (Ubuntu)

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Andreas Hasenack]

And the moment I created another entry on C:\, one of the missing
directories showed up on the linux side :)

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Andreas Hasenack]

Curious indeed. I can reproduce this on xenial mounting a share from a
windows 7 enterprise VM:

With vers 2.1 (same with 2.0):
root@nsn7:~# l /c
total 3,0G
drwxr-xr-x  2 andreas andreas 4,0K Jun 12 16:58 .
drwxr-xr-x 33 rootroot4,0K Jun 27 15:56 ..
-rwxr-xr-x  1 andreas andreas   24 Jun 10  2009 autoexec.bat
-rwxr-xr-x  1 andreas andreas   10 Jun 10  2009 config.sys
drwxr-xr-x  2 andreas andreas 4,0K Out 23  2013 Documents and Settings
-rwxr-xr-x  1 andreas andreas 3,0G Jun 27 15:45 pagefile.sys
drwxr-xr-x  2 andreas andreas0 Jul 13  2009 PerfLogs
drwxr-xr-x  2 andreas andreas0 Jun 12 16:10 ProgramData
dr-xr-xr-x  2 andreas andreas0 Jun 12 21:05 Program Files
drwxr-xr-x  2 andreas andreas0 Out 23  2013 Recovery
drwxr-xr-x  2 andreas andreas0 Nov 26  2014 System Volume Information
dr-xr-xr-x  2 andreas andreas0 Out 23  2013 Users
drwxr-xr-x  2 andreas andreas0 Out 23  2013 Wallpaper
drwxr-xr-x  2 andreas andreas0 Jun 12 16:53 Windows
root@nsn7:~# mount|grep cifs
//10.0.7.128/c on /c type cifs 
(rw,relatime,vers=2.1,sec=ntlmssp,cache=strict,username=IEUser,domain=WORKGROUP,uid=1000,forceuid,gid=1000,forcegid,addr=10.0.7.128,file_mode=0755,dir_mode=0755,nounix,mapposix,rsize=1048576,wsize=1048576,actimeo=1)


Without the vers= parameter we get two extra directories: "Arquivos de 
Programas RFB" and "$Recycle.Bin":
root@nsn7:~# l /c
total 3,0G
drwxr-xr-x  2 andreas andreas 4,0K Jun 12 16:58 .
drwxr-xr-x 33 rootroot4,0K Jun 27 15:56 ..
drwxr-xr-x  2 andreas andreas0 Jun 12 20:52 Arquivos de Programas RFB
-rwxr-xr-x  1 andreas andreas   24 Jun 10  2009 autoexec.bat
-rwxr-xr-x  1 andreas andreas   10 Jun 10  2009 config.sys
drwxr-xr-x  2 andreas andreas0 Jul 14  2009 Documents and Settings
-rwxr-xr-x  1 andreas andreas 3,0G Jun 27 15:45 pagefile.sys
drwxr-xr-x  2 andreas andreas0 Jul 13  2009 PerfLogs
drwxr-xr-x  2 andreas andreas0 Jun 12 16:10 ProgramData
dr-xr-xr-x  2 andreas andreas0 Jun 12 21:05 Program Files
drwxr-xr-x  2 andreas andreas0 Out 23  2013 Recovery
drwxr-xr-x  2 andreas andreas0 Out 23  2013 $Recycle.Bin
drwxr-xr-x  2 andreas andreas0 Nov 26  2014 System Volume Information
dr-xr-xr-x  2 andreas andreas0 Out 23  2013 Users
drwxr-xr-x  2 andreas andreas0 Out 23  2013 Wallpaper
drwxr-xr-x  2 andreas andreas0 Jun 12 16:53 Windows
# mount|grep cifs
//10.0.7.128/c on /c type cifs 
(rw,relatime,vers=1.0,cache=strict,username=IEUser,domain=WORKGROUP,uid=1000,forceuid,gid=1000,forcegid,addr=10.0.7.128,file_mode=0755,dir_mode=0755,nounix,serverino,mapposix,rsize=61440,wsize=65536,actimeo=1)


** Changed in: samba (Ubuntu)
   Status: New => Confirmed

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Title:
  SMB driver (SMBv2) does not show all files when mounting a windows top
  level share

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Andreas Hasenack]

Curious indeed. I can reproduce this on xenial mounting a share from a
windows 7 enterprise VM:

With vers 2.1 (same with 2.0):
root@nsn7:~# l /c
total 3,0G
drwxr-xr-x  2 andreas andreas 4,0K Jun 12 16:58 .
drwxr-xr-x 33 rootroot4,0K Jun 27 15:56 ..
-rwxr-xr-x  1 andreas andreas   24 Jun 10  2009 autoexec.bat
-rwxr-xr-x  1 andreas andreas   10 Jun 10  2009 config.sys
drwxr-xr-x  2 andreas andreas 4,0K Out 23  2013 Documents and Settings
-rwxr-xr-x  1 andreas andreas 3,0G Jun 27 15:45 pagefile.sys
drwxr-xr-x  2 andreas andreas0 Jul 13  2009 PerfLogs
drwxr-xr-x  2 andreas andreas0 Jun 12 16:10 ProgramData
dr-xr-xr-x  2 andreas andreas0 Jun 12 21:05 Program Files
drwxr-xr-x  2 andreas andreas0 Out 23  2013 Recovery
drwxr-xr-x  2 andreas andreas0 Nov 26  2014 System Volume Information
dr-xr-xr-x  2 andreas andreas0 Out 23  2013 Users
drwxr-xr-x  2 andreas andreas0 Out 23  2013 Wallpaper
drwxr-xr-x  2 andreas andreas0 Jun 12 16:53 Windows
root@nsn7:~# mount|grep cifs
//10.0.7.128/c on /c type cifs 
(rw,relatime,vers=2.1,sec=ntlmssp,cache=strict,username=IEUser,domain=WORKGROUP,uid=1000,forceuid,gid=1000,forcegid,addr=10.0.7.128,file_mode=0755,dir_mode=0755,nounix,mapposix,rsize=1048576,wsize=1048576,actimeo=1)


Without the vers= parameter we get two extra directories: "Arquivos de 
Programas RFB" and "$Recycle.Bin":
root@nsn7:~# l /c
total 3,0G
drwxr-xr-x  2 andreas andreas 4,0K Jun 12 16:58 .
drwxr-xr-x 33 rootroot4,0K Jun 27 15:56 ..
drwxr-xr-x  2 andreas andreas0 Jun 12 20:52 Arquivos de Programas RFB
-rwxr-xr-x  1 andreas andreas   24 Jun 10  2009 autoexec.bat
-rwxr-xr-x  1 andreas andreas   10 Jun 10  2009 config.sys
drwxr-xr-x  2 andreas andreas0 Jul 14  2009 Documents and Settings
-rwxr-xr-x  1 andreas andreas 3,0G Jun 27 15:45 pagefile.sys
drwxr-xr-x  2 andreas andreas0 Jul 13  2009 PerfLogs
drwxr-xr-x  2 andreas andreas0 Jun 12 16:10 ProgramData
dr-xr-xr-x  2 andreas andreas0 Jun 12 21:05 Program Files
drwxr-xr-x  2 andreas andreas0 Out 23  2013 Recovery
drwxr-xr-x  2 andreas andreas0 Out 23  2013 $Recycle.Bin
drwxr-xr-x  2 andreas andreas0 Nov 26  2014 System Volume Information
dr-xr-xr-x  2 andreas andreas0 Out 23  2013 Users
drwxr-xr-x  2 andreas andreas0 Out 23  2013 Wallpaper
drwxr-xr-x  2 andreas andreas0 Jun 12 16:53 Windows
# mount|grep cifs
//10.0.7.128/c on /c type cifs 
(rw,relatime,vers=1.0,cache=strict,username=IEUser,domain=WORKGROUP,uid=1000,forceuid,gid=1000,forcegid,addr=10.0.7.128,file_mode=0755,dir_mode=0755,nounix,serverino,mapposix,rsize=61440,wsize=65536,actimeo=1)


** Changed in: samba (Ubuntu)
   Status: New => Confirmed

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Title:
  SMB driver (SMBv2) does not show all files when mounting a windows top
  level share

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Andreas Hasenack]

And the moment I created another entry on C:\, one of the missing
directories showed up on the linux side :)

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Title:
  SMB driver (SMBv2) does not show all files when mounting a windows top
  level share

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[majo]

Hi@all,

I activated the dynamic debugging for readdir.c as Nish Aravamudan suggested. 
However this does not produce any output in the kernel log since (as I 
understand) most of the debug logging (cifs_dbg) is of type FYI which must be 
activated seperately in the code by setting cifsFYI (in fs/cifs/cifsfs.c) to 
CIFS_INFO. I think to do so, I have to recompile the kernel as Uwe Honermann 
suggested.
Doing so, will that help anybody here?
As a reminder: The problem only persists for the smb2 protocol, so removing the 
mounting option vers=2.0 fixes the issue. This is not an option for me, since I 
need that protocol version.

Thanks in advance.

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Title:
  SMB driver (SMBv2) does not show all files when mounting a windows top
  level share

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Uwe Honermann]

As I understand it, I would have to build a new kernel, to do this.

Unfortunately, I don't think, I can do that, since I don't have any
idea, how this works.

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Title:
  SMB driver (SMBv2) does not show all files when mounting a windows top
  level share

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Uwe Honermann]

I know, we had some other Problems without the "nounix", but can't
really remember.

I tried without it, doesn't make any difference.

I'll try with additional debugging, but I'll have to find out, how this
works, since I'm not very familiar with Linux.

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Title:
  SMB driver (SMBv2) does not show all files when mounting a windows top
  level share

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Nish Aravamudan]

This seems like a sort of known issue (unclear still). Cursory grepping
in fs/cifs:

readdir.c::find_cifs_entry

/*
 * If first entry in buf is zero then is first buffer
 * in search response data which means it is likely . and ..
 * will be in this buffer, although some servers do not return
 * . and .. for the root of a drive and for those we need
 * to start two entries earlier.
 */

It might be helpful to enable some more cifs debugging by booting with

dyndbg="file fs/cifs/readdir.c +p"

appended to the kernel commandline?

Also, is there a reason you are passing 'nounix' specifically? It seems
like an uncommon option to need.

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Title:
  SMB driver (SMBv2) does not show all files when mounting a windows top
  level share

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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Uwe Honermann]

Hi,

I tried it with noserverino, no difference.

Exact Mount command used was:

sudo mount -t cifs //SERVER/SHARE_NAME /mnt -o
domain=DOMAIN_NAME,username=USER_NAME,uid=1000,gid=1000,noserverino,nounix,vers=2.0

It looks like the problem has to do with the fact, that the directories
. and .. do not exist in a Windows root Folder.

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  SMB driver (SMBv2) does not show all files when mounting a windows top
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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[ChristianEhrhardt]

Hi,
reproducing is hard as most that come by the bug don't have a win machine 
around most of the time.
But this seems to me a bit like:
https://bugs.launchpad.net/ubuntu/karmic/+source/linux/+bug/406466

Could you try to test with the noserverino mount option if it would fix your 
issue?
so something like:
//1.1.1.1/share/ /mnt/mountpoint smbfs  
noserverino,nolinux,rw,user=MrBen,pass=ShopKeeper,dirmode=0777,filemode=0777 0 0

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  SMB driver (SMBv2) does not show all files when mounting a windows top
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[Bug 1572132] Re: SMB driver (SMBv2) does not show all files when mounting a windows top level share

[Brian Murray]

** Package changed: ubuntu-release-upgrader (Ubuntu) => samba (Ubuntu)

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  SMB driver (SMBv2) does not show all files when mounting a windows top
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