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Message #76639
[Bug 1359670] Re: Unsigned oot modules are wrongly tainted and trace events disabled
** Description changed:
+ [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
+ 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
+ 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
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
In Progress
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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References
