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apport-collect 1755624
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This change has been made by an automated script, maintained by the
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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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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.
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