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Kladno View Drop Down
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    Posted: 02 Mar 2018 at 4:34pm
I hope good news for Intel Skylake CPUs now...
 
03/01/2018
 
Announce that a stand-alone update for Windows 10 Version 1709 is available via the Microsoft Update Catalog. This update includes microcode updates from Intel. See Microsoft Knowledge Base Article 4090007 (https://support.microsoft.com/en-us/help/4090007/intel-microcode-updates) for more information.
 
KB4090007: Intel microcode updates
 
Intel recently announced that they have completed their validations and started to release microcode for newer CPU platforms around Spectre Variant 2 (CVE 2017-5715 ("Branch Target Injection")).
 
We will offer additional microcode updates from Intel thru this KB Article for these Operating Systems as they become available to Microsoft.
 
 


Edited by Kladno - 02 Mar 2018 at 5:07pm
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hhuey5 View Drop Down
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Points: 16 		Post Options Post Options   Thanks (0) Thanks(0)   Quote hhuey5 Quote  Post ReplyReply Direct Link To This Post Posted: 03 Mar 2018 at 6:54am
I'd like more info and user reaction to this update
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chrisw View Drop Down
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I just installed the new update that includes this.  1.4 for the x299 Taichi XE.  I have a 7940x CPU.  This update broke my ability to do a Specific Per Core overclock.  Pretty frustrating.
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Kladno View Drop Down
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Points: 34 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Kladno Quote  Post ReplyReply Direct Link To This Post Posted: 05 Mar 2018 at 2:29am
I tried it and it works.

Asrock Extreme7+, CPU Skylake-S, Windows 10 1709.16299.248

InSpectre

BEFORE

Meltdown protected: YES
Spectre protected : NO

AFTER

Meltdown protected: YES
Spectre protected : YES

Powershell SpeculationControl.psm1

BEFORE

Speculation control settings for CVE-2017-5715 [branch target injection]
For more information about the output below, please refer to https://support.microsoft.com/en-in/help/4074629

Hardware support for branch target injection mitigation is present: False
Windows OS support for branch target injection mitigation is present: True
Windows OS support for branch target injection mitigation is enabled: False
Windows OS support for branch target injection mitigation is disabled by system policy: False
Windows OS support for branch target injection mitigation is disabled by absence of hardware support: True

Speculation control settings for CVE-2017-5754 [rogue data cache load]

Hardware requires kernel VA shadowing: True
Windows OS support for kernel VA shadow is present: True
Windows OS support for kernel VA shadow is enabled: True
Windows OS support for PCID performance optimization is enabled: True [not required for security]

Suggested actions

 * Install BIOS/firmware update provided by your device OEM that enables hardware support for the branch target injection mitigation.

BTIHardwarePresent             : False
BTIWindowsSupportPresent       : True
BTIWindowsSupportEnabled       : False
BTIDisabledBySystemPolicy      : False
BTIDisabledByNoHardwareSupport : True
KVAShadowRequired              : True
KVAShadowWindowsSupportPresent : True
KVAShadowWindowsSupportEnabled : True
KVAShadowPcidEnabled           : True

AFTER

Speculation control settings for CVE-2017-5715 [branch target injection]
For more information about the output below, please refer to https://support.microsoft.com/en-in/help/4074629

Hardware support for branch target injection mitigation is present: True
Windows OS support for branch target injection mitigation is present: True
Windows OS support for branch target injection mitigation is enabled: True

Speculation control settings for CVE-2017-5754 [rogue data cache load]

Hardware requires kernel VA shadowing: True
Windows OS support for kernel VA shadow is present: True
Windows OS support for kernel VA shadow is enabled: True
Windows OS support for PCID performance optimization is enabled: True [not required for security]

BTIHardwarePresent             : True
BTIWindowsSupportPresent       : True
BTIWindowsSupportEnabled       : True
BTIDisabledBySystemPolicy      : False
BTIDisabledByNoHardwareSupport : False
KVAShadowRequired              : True
KVAShadowWindowsSupportPresent : True
KVAShadowWindowsSupportEnabled : True
KVAShadowPcidEnabled           : True

This actually is a Windows update which updates Windows file
C:\Windows\System32\mcupdate_GenuineIntel.dll for Intel CPU,
or eventually mcupdate_AuthenticAMD.dll for AMD CPU.

The update KB4090007 can be uninstalled.
I do not see any side effects yet.

Check value "Update Revision" before and after in registry key:

[HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor]

In Windows is Intel Microcode Update Revision changed to C2 now.



Edited by Kladno - 05 Mar 2018 at 2:33am
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