[Bug 1628735] [NEW] Autofs variables do not work with kernel 4.4.0-38.57

[Christopher Hill]

Public bug reported:

Autofs supports variables (e.g. $UID, $GID, $HOME, etc), which can be
used in automounter map files. One may have configuration such as
"credentials=${HOME}/.authfile,uid=${UID},gid=${GID}".

If accessing the mount as user "foo", this should have the automounter
take credentials from ~foo/.authfile and mount it as being owned by
foo:foo.

On kernel 4.4.0-36.55 and earlier this all works as expected.

It no longer works with kernel 4.4.0-38.57 and instead these variables
are always as user "root".

** Affects: autofs (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1628735

Title:
  Autofs variables do not work with kernel 4.4.0-38.57

Status in autofs package in Ubuntu:
  New

Bug description:
  Autofs supports variables (e.g. $UID, $GID, $HOME, etc), which can be
  used in automounter map files. One may have configuration such as
  "credentials=${HOME}/.authfile,uid=${UID},gid=${GID}".

  If accessing the mount as user "foo", this should have the automounter
  take credentials from ~foo/.authfile and mount it as being owned by
  foo:foo.

  On kernel 4.4.0-36.55 and earlier this all works as expected.

  It no longer works with kernel 4.4.0-38.57 and instead these variables
  are always as user "root".

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