SRU: Bootable buildd images boot vulnerable kernels

Bug #1891061 reported by Cody Shepherd
This bug affects 1 person
Affects Status Importance Assigned to Milestone
livecd-rootfs (Ubuntu)

Bug Description


 * Bootable buildd images are currently built from the -release pocket only,
   leaving them vulnerable to issues fixed by -updates and/or -security.

 * MP: #387164 [1] should be backported to ensure updated packages are used
   when building the bootable buildd images.

[Test Case]

 * Inspect package manifest for bootable buildd images; verify outdated versions
   of packages

[Regression Potential]

 * updated packages could break current assumptions for bootable buildd images, and cause
   boot or runtime failures, though this has not been seen in testing.


Related branches

Revision history for this message
Timo Aaltonen (tjaalton) wrote : Please test proposed package

Hello Cody, or anyone else affected,

Accepted livecd-rootfs into focal-proposed. The package will build now and be available at in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-focal to verification-done-focal. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-focal. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

Changed in livecd-rootfs (Ubuntu Focal):
status: New → Fix Committed
tags: added: verification-needed verification-needed-focal
Revision history for this message
Cody Shepherd (codyshepherd) wrote :

I've verified that this is fixed for Focal by:

* Building the livecd-rootfs 2.664.5 source package in a private ppa
* Building the focal buildd image with the cpc-buildd livefs, with the above private-ppa as an extra archive
* Booting the resulting disk-linux-virtual.img in Multipass with libvirt as the local driver, and verifying that a) the running kernel was updated (5.4.0-42.46-generic in this case), and b) -updates and -security were enabled in the apt sources.list


tags: added: verification-done-focal
removed: verification-needed verification-needed-focal
Changed in livecd-rootfs (Ubuntu):
status: New → Fix Released
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package livecd-rootfs - 2.664.5

livecd-rootfs (2.664.5) focal; urgency=medium

  [ Robert C Jennings ]
  * Handle seeded lxd snap with channel name for ubuntu-cpc:minimized
    (LP: #1889470)

  [ Cody Shepherd ]
  * Add dist-upgrade to bootable-buildd hook to ensure the built image
    doesn't contain vulnerable kernels or other packages. LP: #1891061.
  * Don't explicitly install grub-efi-amd64-signed, it's a dependency of

 -- Steve Langasek <email address hidden> Tue, 04 Aug 2020 12:39:27 -0700

Changed in livecd-rootfs (Ubuntu Focal):
status: Fix Committed → Fix Released
Revision history for this message
Brian Murray (brian-murray) wrote : Update Released

The verification of the Stable Release Update for livecd-rootfs has completed successfully and the package is now being released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.

Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package livecd-rootfs - 2.525.47

livecd-rootfs (2.525.47) bionic; urgency=medium

  * Apparently the lxd appliance needs to use a custom track (4.0) and since
    model assertions do not accept track names in required-snaps, we need to do
    this by hand during build. (LP: #1891505)

 -- Łukasz 'sil2100' Zemczak <email address hidden> Wed, 12 Aug 2020 15:58:19 +0200

Changed in livecd-rootfs (Ubuntu Bionic):
status: New → Fix Released
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