[Bug 1902957] Re: Update kernel packaging to support forward porting kernels

This bug was fixed in the package linux - 5.8.0-36.40+21.04.1

---------------
linux (5.8.0-36.40+21.04.1) hirsute; urgency=medium

* Packaging resync (LP: #1786013)
- update dkms package versions

[ Ubuntu: 5.8.0-36.40 ]

* debian/scripts/file-downloader does not handle positive failures correctly
(LP: #1878897)
- [Packaging] file-downloader not handling positive failures correctly

[ Ubuntu: 5.8.0-35.39 ]

* Packaging resync (LP: #1786013)
- update dkms package versions
* CVE-2021-1052 // CVE-2021-1053
- [Packaging] NVIDIA -- Add the NVIDIA 460 driver

-- Kleber Sacilotto de Souza <kleber.souza@canonical.com> Thu, 07 Jan
2021 11:57:30 +0100

** Changed in: linux (Ubuntu Hirsute)
Status: In Progress => Fix Released

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-1052

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-1053

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https://bugs.launchpad.net/bugs/1902957

Title:
Update kernel packaging to support forward porting kernels

Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Precise:
Invalid
Status in linux source package in Trusty:
Fix Committed
Status in linux source package in Xenial:
Fix Released
Status in linux source package in Bionic:
Fix Released
Status in linux source package in Focal:
Fix Released
Status in linux source package in Groovy:
Fix Released
Status in linux source package in Hirsute:
Fix Released

Bug description:
SRU Justification

Impact: Our kernel packaging currently has support for backporting
kernels to older releases. This includes appending ~BACKPORT_SUFFIX to
the version string for the backport kernel, where BACKPORT_SUFFIX is
defined in update.conf. We need to start doing similar forward ported
kernels, but BACKPORT_SUFFIX should be appended using a + rather than
a ~. Our kernel packaging cannot easily determine whether a + or a ~
is appropriate.

Fix: Move the leading character into BACKPORT_SUFFIX, and do not
insert any leading characters from the kernel packaging scripts. Since
the script which generates update.conf has access to information from
kernel-series, it can more easily determine whether + or ~ is the
appropriate leader.

Test Case: Run through the normal steps for updating a backport
kernel. The version string generated should have ~SERIES for a
backport to an older series, and +SERIES for a backport to a newer
series.

Regression Potential: Backport kernels could end up with an incorrect
version strings. Since all kernel uploads undergo review, any such
errors should be caught before uploading.

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