[Bug 1701073] Re: CVE-2017-2619 regression breaks symlinks

[Dave Kettmann]

Shell script attached to be run on fresh install of Xenial.

Powershell commands to test functionality below:

Set-Location \\smb-xenial\reproducer\opt\root
Get-ChildItem
Set-Location \\smb-xenial\reproducer\opt\opt
Get-ChildItem
Get-Content \\smb-xenial\reproducer\opt\smb.conf

The first location works, the last two do not. These were run on a
Windows 7 desktop VM.

** Attachment added: "Reproducer shell script"
   https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1701073/+attachment/4906645/+files/lp1701073.sh

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https://bugs.launchpad.net/bugs/1701073

Title:
  CVE-2017-2619 regression breaks symlinks

Status in samba:
  Unknown
Status in samba package in Ubuntu:
  New

Bug description:
  Found in current version in Xenial (4.3.11+dfsg-0ubuntu0.16.04.7).
  When share's path is '/', symlinks do not work properly from Windows
  client. Gives "Cannot Access" error.

  To reproduce:

  1. Install samba and related dependencies

  apt install -y samba

  2. Add a share at the end of the default file that uses '/' as the
  path:

  [reproducer]
          comment = share
          browseable = no
          writeable = yes
          create mode = 0600
          directory mode = 0700
          path = /

  3. Attempt to access a symlink somewhere within the path of the share
  with a Windows client.

  4. Receive "Windows cannot access..." related error

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