[Bug 1675698] Re: Cannot access anything under a subdirectory if symlinks are disallowed

[Marc Deslauriers]

Thanks for reporting this issue, I can reproduce it.

** Bug watch added: Samba Bugzilla #12496
   https://bugzilla.samba.org/show_bug.cgi?id=12496

** Also affects: samba via
   https://bugzilla.samba.org/show_bug.cgi?id=12496
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1675698

Title:
  Cannot access anything under a subdirectory if symlinks are disallowed

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

Bug description:
  After upgrading to 4.3.11+dfsg-0ubuntu0.14.04.6, some of my shares
  broke in a curious way. The affected shares have `follow symlinks =
  no`; the ones with `follow symlinks = yes` aren't affected AFAICT.
  Allowing symlinks on one of the affected shares mitigates the issue
  for that share.

  The issue is that access to anything under a direct subdirectory of
  the share doesn't work. I can create a directory in `\\srv\share`,
  e.g. `\\srv\share\foo`, but I can't create any files or directories
  inside it, e.g. creating `\\srv\share\foo\bar` ends up with error 50
  (The request is not supported). Attempts to access existing files or
  directories at this level produce error 59 (An unexpected network
  error occured).

  The log at level 2 says:

  ```
  ../source3/smbd/vfs.c:1298(check_reduced_name)
    check_reduced_name: Bad access attempt: branches is a symlink to foo/bar

  ```

  ... or:

  ```
  ../source3/smbd/vfs.c:1298(check_reduced_name)
    check_reduced_name: Bad access attempt: . is a symlink to foo
  ```

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