No I think it's because kernel lockdown: commit 708822cdbcd3faab40e83a79b71617e1812a1b06 Author: Matthew Garrett <mj...@srcf.ucam.org> Date: Mon Feb 18 12:44:59 2019 +0000
UBUNTU: SAUCE: (efi-lockdown) x86/msr: Restrict MSR access when the kernel is locked down Writing to MSRs should not be allowed if the kernel is locked down, since it could lead to execution of arbitrary code in kernel mode. Based on a patch by Kees Cook. MSR accesses are logged for the purposes of building up a whitelist as per Alan Cox's suggestion. Signed-off-by: Matthew Garrett <mj...@srcf.ucam.org> Signed-off-by: David Howells <dhowe...@redhat.com> Acked-by: Kees Cook <keesc...@chromium.org> Reviewed-by: Thomas Gleixner <t...@linutronix.de> cc: x...@kernel.org Signed-off-by: Matthew Garrett <matthewgarr...@google.com> (cherry picked from commit 323bd1cb92e03558ae3f3a11dd683dcbb23eeaea git://git.kernel.org/pub/scm/linux/kernel/git/jwboyer/fedora.git) Signed-off-by: Seth Forshee <seth.fors...@canonical.com> ** Also affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to thermald in Ubuntu. https://bugs.launchpad.net/bugs/1840454 Title: kernel 5.2 disallows thermald's direct MSR writes Status in linux package in Ubuntu: New Status in thermald package in Ubuntu: New Bug description: thermald/kernel are spamming dmesg now because MSR write is disallowed. jak@jak-t480s:~:master$ journalctl -b --since=today | grep msr | wc -l 8688 jak@jak-t480s:~:master$ journalctl -b --since=today | grep msr | tail Aug 16 14:48:57 jak-t480s thermald[11327]: [WARN]sysfs write failed /dev/cpu/0/msr Aug 16 14:48:57 jak-t480s kernel: msr: Direct access to MSR 1a2 Aug 16 14:49:05 jak-t480s thermald[11327]: [WARN]sysfs write failed /dev/cpu/0/msr Aug 16 14:49:05 jak-t480s kernel: msr: Direct access to MSR 1a2 Aug 16 14:49:13 jak-t480s thermald[11327]: [WARN]sysfs write failed /dev/cpu/0/msr Aug 16 14:49:13 jak-t480s kernel: msr: Direct access to MSR 1a2 Aug 16 14:49:21 jak-t480s thermald[11327]: [WARN]sysfs write failed /dev/cpu/0/msr Aug 16 14:49:21 jak-t480s kernel: msr: Direct access to MSR 1a2 Aug 16 14:50:03 jak-t480s kernel: msr: Direct access to MSR 1a2 Aug 16 14:50:03 jak-t480s thermald[11327]: [WARN]sysfs write failed /dev/cpu/0/msr To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1840454/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp