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[Launchpad Bug Tracker <1629204@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.8.0-21.23

---------------
linux (4.8.0-21.23) yakkety; urgency=low

  [ Tim Gardner ]

  * Release Tracking Bug
    - LP: #1630279

  * powerpc 4.8.0-17 fails to boot on PowerMac G5 (LP: #1628968)
    - Revert "Revert "powerpc: Simplify module TOC handling""

  * Regression tests can not detect binfmt_elf mmpa semantic change
    (LP: #1630069)
    - SAUCE: apparmor: add flag to detect semantic change, to binfmt_elf mmap

  * Autofs parameter substitution broken in kernel 4.4.0-38 and 4.4.0-40
    (LP: #1629204)
    - SAUCE: (namespace) autofs4: Use real_cred for requestor's ids

 -- Tim Gardner <tim.gardner@xxxxxxxxxxxxx>  Tue, 04 Oct 2016 08:01:21
-0600

** Changed in: linux (Ubuntu Yakkety)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1629204

Title:
  Autofs parameter substitution broken in kernel 4.4.0-38 and 4.4.0-40

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  SRU Justification

  Impact: ca6fe3344554 "fs: Call d_automount with the filesystems creds"
  causes a regression in the requester uid and gid passed to userspace
  during automount, as the current credentials during automount are
  those of root and not the user who requested the mount.

  Fix: Use current->real_cred instead of current->cred for getting the
  requester's uid and gid.

  Regression Potential: Minimal. current->cred and current->real_cred
  are the same except when credentials are overridden, thus
  current->real_cred contains the same credentials that autofs had been
  using prior to the change which overrides the credentials during
  automount.

  ---

  Hello,

  I have run into a bug relating autofs's parameter substitution (e.g.
  UID, GID, etc) with kernel versions 4.4.0-38 and proposed 4.4.0-40.
  Kernel version 4.4.0-28 does things correctly but testing intermediate
  kernel versions is hard due to earlier bugs related with fs's.
  Incorrect parameter substitution makes CIFS mounting with variable
  credentials impossible.

  Wat was expected:
  $UID in autofs map are substituted by the uid of the user that starts the auto-mounting process.

  What actually happens:
  Root's uid (0) is substituted instead.

  This ill parameter substitution likely caused by recent fixes
  resolving permissions problems for nfs/cifs mounts and dfs referrals
  (#1626112 and #1612135). And possibly the fix 'fs: Call d_automount
  with the filesystems creds' but that is a wild guess.

  Furthermore; playing with the force_standard_program_map_env settings
  in autofs.conf and prefixing variables with 'AUTOFS_' does not solve
  anything.

  Yours kindly,

  Chris

  ---- Additional info ----

    lsb_release -rd
  Description:    Ubuntu 16.04.1 LTS
  Release:        16.04
  ---
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  run00001   3015 F.... pulseaudio
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=f2a2c5c4-2f41-482a-80b4-968a87131214
  InstallationDate: Installed on 2016-09-19 (10 days ago)
  InstallationMedia: Kubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  IwConfig:
   enp0s8    no wireless extensions.

   enp0s3    no wireless extensions.

   lo        no wireless extensions.
  Lsusb:
   Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: innotek GmbH VirtualBox
  Package: linux (not installed)
  ProcEnviron:
   LANGUAGE=
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 vboxdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-40-generic root=/dev/sda1 ro quiet splash
  ProcVersionSignature: Ubuntu 4.4.0-40.60-generic 4.4.21
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-40-generic N/A
   linux-backports-modules-4.4.0-40-generic  N/A
   linux-firmware                            1.157.3
  RfKill:

  Tags:  xenial
  Uname: Linux 4.4.0-40-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  _MarkForUpload: True
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.board.name: VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
  dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH

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