Windows 10: Speculative Store Bypass registry settings cause restart failure

Discus and support Speculative Store Bypass registry settings cause restart failure in Windows 10 BSOD Crashes and Debugging to solve the problem; From MS info for IT tech " Manage Speculative Store Bypass and mitigations around Spectre Variant 2 and Meltdown Applies to: Windows 10, version... Discussion in 'Windows 10 BSOD Crashes and Debugging' started by Leamad, Oct 5, 2018.

  1. LEAMAD
    Leamad Win User

    Speculative Store Bypass registry settings cause restart failure


    From MS info for IT tech "

    Manage Speculative Store Bypass and mitigations around Spectre Variant 2 and Meltdown

    Applies to: Windows 10, version 1803, Windows 10, version 1709, Windows 10, version 1703, Windows 10, version 1607, Windows 10, Windows 8.1, and Windows 7 SP1.

    • Enable mitigations around Speculative Store Bypass (CVE-2018-3639) together with mitigations around Spectre Variant 2 (CVE-2017-5715 "Branch Target Injection") and Meltdown (CVE-2017-5754) through the following registry settings (because they are not enabled by default).
      reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management" /v FeatureSettingsOverride /t REG_DWORD /d 8 /f
      reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management" /v FeatureSettingsOverrideMask /t REG_DWORD /d 3 /f

    "


    I sent GPO to install the registry values. Most machines are OK with reboot. But some are not and enter the startup repair dialog. I used the repair tools and checked the registry on several failing machines. FeatureSettingsOverride is set to 8. If I change it to 0 the machines will reboot. I checked a few unaffected machines and the value is 8. So far, affected machines are Win10 builds 1607 and 1703. So far no Win7, Win 8.1 or Win10 builds 1709/1803 machines have reported the problem, and I haven't verified if any Win10 build 1702/1607 machines have rebooted successfully after the GPO is installed. I have not correlated with install status of any MS patches. I suspect it's possible that affected machines have not installed the underlying patch. Considering the complexity of the Spectre/Meltdown class of vulnerabilities and the actions MS has taken I ask if anyone has experienced this problem and what they did to fix it.

    :)
     
    Leamad, Oct 5, 2018
    #1
  2. JEFFREY
    jeffrey Win User

    Cumulative Update KB4284819 Windows 10 v1709 Build 16299.492 - June 12


    https://support.microsoft.com/en-us/...erabilities-in
    Manage Speculative Store Bypass and mitigations around Spectre Variant 2 and Meltdown

    • Enable mitigations around Speculative Store Bypass (CVE-2018-3639) together with mitigations around Spectre Variant 2 (CVE-2017-5715) and Meltdown (CVE-2017-5754) through the following registry settings (because they are not enabled by default)
    • reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management" /v FeatureSettingsOverride /t REG_DWORD /d 8 /f
    • reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management" /v FeatureSettingsOverrideMask /t REG_DWORD /d 3 /f
    • Note These registry changes require administrative rights and a restart.
     
    jeffrey, Oct 5, 2018
    #2
  3. DAVETOMS
    DaveToms Win User
    Broken security by bypassing lock screen on restart

    Question:

    Why does Windows bypass the lock screen when it restarts after a Windows update? I consider this a security design flaw. If a maintenance crew came by my home while I'm at work to do some home renovation upgrades but they left the
    front door unlocked when they finished, when I got home I'd wonder what on Earth they were thinking. I hope I've just missed a setting somewhere to disable this.

    Three things I accept:

    1. Locking my computer to protect my privacy.

    2. Windows restarting after an update.

    3. Windows automatically updating, which is frustrating but acceptable.

    But I don't accept Windows bypassing the lock screen after an update.

    Precondition:

    Windows 10 is set up to require a password at sign in, both on startup and on the lock screen.

    Steps to reproduce:

    Step 1: Lock the computer.

    Step 2: Leave the room.

    Step 3: Wait for Windows to perform an automatic system update.

    Step 4: Windows restarts automatically.

    Problem 1: Windows bypasses the lock screen, instead signing in and showing the desktop.

    Problem 2: Come home and book a doctor's appointment to deal with the stress of seeing my computer unlocked.

    It's my first post in the community so suggestions about posting etiquette are welcome.
     
    DaveToms, Oct 5, 2018
    #3
  4. STEVE C
    Steve C Win User

    Speculative Store Bypass registry settings cause restart failure

    Cumulative Update KB4284819 Windows 10 v1709 Build 16299.492 - June 12


    Thanks. I made the above changes and I still get the report "Windows OS support for speculative store bypass mitigation is enabled system-wide: False"
     
    Steve C, Oct 5, 2018
    #4
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Speculative Store Bypass registry settings cause restart failure

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