[Bug 1545750] Re: Access denied if the share path is "/"

[Marc Deslauriers]

ACK on the debdiffs, I've uploaded them for building with the following
small changes:

- Clean out cruft in trusty and wily patched
- wrapped changelog line to fix lintian warning
- fixed trusty package version number
- re-targeted to -security pocket.

I will publish these updates as a security regression fix once they have
been tested. Thanks!

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Title:
  Access denied if the share path is "/"

Status in samba:
  Unknown
Status in samba package in Ubuntu:
  Confirmed
Status in samba source package in Precise:
  Confirmed
Status in samba source package in Trusty:
  Confirmed
Status in samba source package in Wily:
  Confirmed
Status in samba package in Debian:
  New

Bug description:
  [Impact]

   * User is denied access when trying to access a share "/"

  [Test Case]

   * Setup a Samba server

   * Add a share with path "/"

   * Try to access the share

  [Regression Potential]

   * This has been introduced upstream by security patch CVE-2015-5252.

   * It has been already fixed upstream.

   * This is just a backport of the fix.

  [Other Info]
   
   * Original bug description:

  The fix for bug #11395 / CVE-2015-5252
  https://git.samba.org/?p=samba.git;a=commitdiff;h=7606c0db257b3f9d84da5b2bf5fbb4034cc8d77d
  locked down the path checks in check_reduced_name[_with_privilege]() to prevent unintended access via wide links.

  The new checks do not correctly treat a corner case though: the case
  of the share path being "/". (Important e.g. for using the glusterfs
  VFS module.)

  In this case all operations after tree connect get ACCESS_DENIED.

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