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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu Trusty)
       Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/1359670

Title:
  Unsigned oot modules are wrongly tainted and trace events disabled

Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Trusty:
  Fix Committed
Status in “linux” source package in Utopic:
  Fix Released

Bug description:
  [Impact]

  Developers are unable to unable to use kernel tracing functions on
  kernel modules they have themselves compiled.  This makes Ubuntu a
  poor platform for module developement and debugging.

  [Test Case]

  Build an OOT or modified version of a module, insert it and notice
  that tracing becomes disabled.  Apply updated kernel and confirm the
  same does not occur.

  [Regression Potential]

  This only changes the taint infrastructure to introduce a single new
  flag. Should be very low risk.

  ===

  The issue is explained in detail at http://lwn.net/Articles/588799/

  I am trying to load a backported drm module using dkms.
  It is not signed so is listed as tainted and trace points are disabled.
  As explained in the above article this is because the TAINT_FORCED MODULE flag is incorrectly set for unsigned modules.

  The final patch to fix this and add a TAINT_UNSIGNED_MODULE that does
  not disable trace points can be found at
  http://lwn.net/Articles/588803/ (fixed in 3.15)

  Please consider shipping this patch.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-34-generic 3.13.0-34.60
  ProcVersionSignature: Ubuntu 3.13.0-34.60-generic 3.13.11.4
  Uname: Linux 3.13.0-34-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  badger     2013 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Aug 21 11:28:15 2014
  HibernationDevice: RESUME=UUID=21f8f6b4-495d-4bc6-8dec-1f78435d4b95
  InstallationDate: Installed on 2014-06-30 (51 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 0301CTO
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-34-generic root=UUID=d56caf05-a203-436f-8497-b8a37294fe8a ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-34-generic N/A
   linux-backports-modules-3.13.0-34-generic  N/A
   linux-firmware                             1.127.5
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/14/2010
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 80ET42WW (1.19 )
  dmi.board.name: 0301CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr80ET42WW(1.19):bd10/14/2010:svnLENOVO:pn0301CTO:pvrThinkPadEdge:rvnLENOVO:rn0301CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 0301CTO
  dmi.product.version: ThinkPad Edge
  dmi.sys.vendor: LENOVO

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