Windows 10: KB4078130 Update to Disable Mitigation against Spectre, Variant 2

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  1. Posts : 351
    Windows 10 x64 17134.228
       31 Jan 2018 #30

    @RingTailCoon the information I had previously posted was from a discussion on another forum.

    I did several tests on this issue today.

    When MS released the Spectre Variant 2 critical update I already had set FeatureSettingsOverride to 0 and FeatureSettingsOverrideMask to 3. When I ran the critical update on my computer it only changed the FeatureSettingsOverride to 1 leaving the FeatureSettingsOverrideMask still at 3.


    Here are my personal findings for when running the Spectre Variant 2 critical update with various value combinations of the FeatureSettingsOverride and FeatureSettingsOverrideMask :

    1. If the registry entries does not exist the update will create the FeatureSettingsOverride and FeatureSettingsOverrideMask entries and set both to 1.
    2. If FeatureSettingsOverride was set at 0 and FeatureSettingsOverrideMask at 0 the update will change both to 1.
    3. If FeatureSettingsOverride was set at 1 and FeatureSettingsOverrideMask at 1 the update will make no changes to these two entries.
    4. If FeatureSettingsOverride was set at 0 and FeatureSettingsOverrideMask at 3 the update will change only the FeatureSettingsOverride to 1 while still leaving FeatureSettingsOverrideMask at 3.
    5. If FeatureSettingsOverride was set at 1 and FeatureSettingsOverrideMask at 2 the update will change only the FeatureSettingsOverrideMask to 3 while leaving FeatureSettingsOverride set at 1.
    6. If FeatureSettingsOverride was set at 1 and FeatureSettingsOverrideMask at 3 the update will make no changes to these two entries.
    7. If FeatureSettingsOverride was set at 2 and FeatureSettingsOverrideMask at 2 the update will change both to 3.
    8. If FeatureSettingsOverride was set at 3 and FeatureSettingsOverrideMask at 3 the update will make no changes to these two entries.

    "FeatureSettingsOverrideMask" defines the bit range for "FeatureSettingsOverride"
    Last edited by Polo6RGTI; 31 Jan 2018 at 10:58.
      My ComputersSystem Spec


  2. Posts : 1,534
    WinX Pro x64 IP current
       31 Jan 2018 #31

    SaggyMaggyPoo said: View Post
    Did the repair install anyway which does seem to have solved the rebooting issue (though it's early days yet!). I also downloaded InSpectre and ran it on both our laptops and both say they are vulnerable for Spectre, giving the following information:

    This system's protection against the Spectre vulnerability has been deliberately disabled by system settings. Even if the system's hardware is able to manage the Spectre threat, the operating system's settings will need to be changed to enable Spectre protection.

    Windows' Spectre vulnerability protection (only) has been deliberately disabled by settings in this system's registry. Although overall system performance will be improved, this system will be vulnerable to Spectre attacks. Meltdown protection has not been disabled.

    I ran the KB4078130 update on both laptops initially, but then did a repair install on one, which presumably replaced the registry, so not sure why both would be showing vulnerabilities to Spectre.

    Assuming the reboot problem is fixed, is it possible (does it make sense) to change the registry setting(s) back to 0?

    Dell are advising not to update the BIOS yet so I guess we just have to wait and remember those back-ups!
    You should be able to change the registry values with no ill effects, however, it's possible that the system restore didn't note the change in the registry entries when you ran the KB4078130 update for whatever reason - did you make a restore point before running the update?

    I'd also check for what updates you have installed to see if it is still showing as installed (from appwiz.cpl, click Show Installed Updates at the left)
      My ComputersSystem Spec

  3.    22 Feb 2018 #32

    Mine is showing;

    FeatureSettingsOverride 1
    FeatureSettingsOverrideMask 1

    What does it mean? Thanks.
      My ComputerSystem Spec


  4. Posts : 564
    Windows 10 Pro x64
       22 Feb 2018 #33

    It means you are overriding Spectra variant 2 patch (the one requiring a microcode update as well as windows patch). The microcode has been problematic.
      My ComputerSystem Spec


  5. Posts : 436
    Windows 10 PRO
       22 Feb 2018 #34

    Geneo said: View Post
    It means you are overriding Spectra variant 2 patch (the one requiring a microcode update as well as windows patch). The microcode has been problematic.
    Haven't received any for my GIGABYTE GA-H110M-S2H...
      My ComputerSystem Spec


  6. Posts : 414
    Windows 10 Pro 1803 17134.137
       23 Feb 2018 #35

    RingTailCoon said: View Post
    Haven't received any for my GIGABYTE GA-H110M-S2H...
    Do you have F25a installed ?
      My ComputersSystem Spec


  7. Posts : 436
    Windows 10 PRO
       23 Feb 2018 #36

    storageman said: View Post
    Do you have F25a installed ?
    Yes yes :) That was the last one that they released.

    GA-H110M-S2H (rev. 1.0) | Motherboard - GIGABYTE Global
      My ComputerSystem Spec


  8. Posts : 436
    Windows 10 PRO
       15 Mar 2018 #37

    Whe-hey! Finally I got the CPU update! (F25c) (Update CPU-Microcode) only Inspectre keeps on blabbering that Spectre prot. is still disabled and I can't get it enabled (keeps turning off...)

    So HOW dó I turn it back on?

    edit oops never mind, had to restart haha!
      My ComputerSystem Spec


  9. Posts : 9,009
    Windows 10 Pro x64 Build 1803
       12 Apr 2018 #38

    So to enable both I assume you, @RingTailCoon set FeatureSettingOverride and FeatureSettingOverrideMask to 0 (zero), correct?
      My ComputerSystem Spec


  10. Posts : 436
    Windows 10 PRO
       12 Apr 2018 #39

    Caledon Ken said: View Post
    So to enable both I assume you, @RingTailCoon set FeatureSettingOverride and FeatureSettingOverrideMask to 0 (zero), correct?
    Yes
      My ComputerSystem Spec


 
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