** Also affects: linux (Ubuntu Disco)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: In Progress
** Changed in: linux (Ubuntu Disco)
Assignee: Skipper Bug Screeners (skipper-screen-team) => Kamal Mostafa
(kamalmostafa)
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https://bugs.launchpad.net/bugs/1807686
Title:
efi-lockdown patch causes -EPERM for some debugfs files even though
CONFIG_LOCK_DOWN_KERNEL is not set
Status in Ubuntu on IBM z Systems:
Triaged
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Cosmic:
In Progress
Status in linux source package in Disco:
In Progress
Bug description:
== Comment: #0 - Dominik Klein <dominik.kl...@de.ibm.com> - 2018-12-10
03:58:10 ==
There seems to be a bug in the efi-lockdown patch as applied on top of
vanilla for Cosmic kernels:
http://kernel.ubuntu.com/git/ubuntu/ubuntu-cosmic.git/commit/fs/debugfs/file.c?id=a1ba65da9ceae481c154bfd1a2c1550e4566d986
Also seems to be present for Disco as of today:
http://kernel.ubuntu.com/git/ubuntu/ubuntu-disco.git/commit/fs/debugfs/file.c?id=a1ba65da9ceae481c154bfd1a2c1550e4566d986
The problem is that part of the patch modifies kernel behavior
independently of CONFIG_LOCK_DOWN_KERNEL being set or not causing
issues on two debugfs files on s390x.
Vasily Gorbik has already analyzed the problem and has posted a proposed fix
here:
https://lkml.org/lkml/2018/11/21/634
https://lkml.org/lkml/2018/11/21/635
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