** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
--
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/1755624
Title:
With intel-microcode 3.20180312, kernel reports as broken spectre v2
microcode
Status in linux package in Ubuntu:
Confirmed
Bug description:
With an intel-microcode package based off of
https://downloadcenter.intel.com/download/27591/Linux-Processor-
Microcode-Data-File, when booting, the kernel 4.15.0-10.11-generic
reports the following in dmesg:
[ 0.000000] microcode: microcode updated early to revision 0x84, date =
2018-01-21
[ 0.000000] Intel Spectre v2 broken microcode detected; disabling
Speculation Control
And indeed, none of ibrs, ibpb, or stibp show up in /proc/cpuinfo.
Other testers of the updated microcode report seeing the same thing.
The processor this is being tested on is:
cpu family : 6
model : 142
model name : Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz
stepping : 9
microcode : 0x84
The test for the microcode is in https://git.launchpad.net/~ubuntu-
kernel/ubuntu/+source/linux/+git/bionic/tree/arch/x86/kernel/cpu/intel.c#n178
; specifically, it looks like bad_spectre_microcode(c) is returning
true.
It seems
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d37fc6d360a404b208547ba112e7dabb6533c7fc
has not been pulled in yet (though it's staged as
3e442a86b70eea274d01569244584d91e2f287e7 in bionic/master-next and is
in 4.15.0-12.13 in bionic-proposed), which addresses things for Kaby
Lake processors, but other processers may need to be verified for
correctness.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1755624/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : [email protected]
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
