Windows 10: New Windows 10 Insider Preview Fast and Skip Ahead Build 17686 -June 6 Insider

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  1. Cliff S's Avatar
    Posts : 21,653
    Win10 Pro, Win10 Pro N, Win10 Home, Win10 Pro Insider Fast Ring, Windows 8.1 Pro, Ubuntu
       12 Jun 2018 #160

    As my Insider Preview is a Hyper-V virtual machine, so runs parasitic off my host PC, I was curious about it's Meltdown & Spectre protection(thought about it while making sure both system settings are about the same, and was comparing).

    Yep it's protected too. that wasn't a given to me, as a VM is technically another machine.
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  2. kado897's Avatar
    Posts : 21,445
    Windows 10 Home 64bit
       12 Jun 2018 #161

    Just tried it with VirtualBox. Nope, not protected.
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  3.    12 Jun 2018 #162

    kado897 said: View Post
    Just tried it with VirtualBox. Nope, not protected.
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    Is host protected ?
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  4. kado897's Avatar
    Posts : 21,445
    Windows 10 Home 64bit
       12 Jun 2018 #163

    CountMike said: View Post
    Is host protected ?
    Yes and it has the same CPUID.

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  5. kado897's Avatar
    Posts : 21,445
    Windows 10 Home 64bit
       12 Jun 2018 #164

    A search on the VB forum reveals that there is a hidden switch to expose the spectre state of the host. Apparently it is not enabled by default because of performance issues.
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  6. Cliff S's Avatar
    Posts : 21,653
    Win10 Pro, Win10 Pro N, Win10 Home, Win10 Pro Insider Fast Ring, Windows 8.1 Pro, Ubuntu
       12 Jun 2018 #165

    Sets in action:

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  7. Fabler2's Avatar
    Posts : 569
    Windows 10 preview 64-bit Pro
       12 Jun 2018 #166

    Sets is working, kind of, for me. If I open Task manager then add a couple of Apps in new tabs then close the window, then open Task manager again I can use the Previous Tabs icon and it brings up the previous tabs list. If I close it and open file manager then no previous tabs exists. Has to be the original app. If I select task manager in timeline, it opens two windows. One has a black background with Task manager in white text and the other is the actual task manager app. From there I can select the previous apps list.
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  8.    12 Jun 2018 #167

    Cliff S said: View Post
    As my Insider Preview is a Hyper-V virtual machine, so runs parasitic off my host PC, I was curious about it's Meltdown & Spectre protection(thought about it while making sure both system settings are about the same, and was comparing).

    Yep it's protected too. that wasn't a given to me, as a VM is technically another machine.
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    Hyper-V is more closely integrated with Host than other virtual machines i.e. has more direct access to host resources. Other VMs interface more indirectly. Could that be the reason why Hyper-V vms get the updates but other VMs do not?
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  9. Cliff S's Avatar
    Posts : 21,653
    Win10 Pro, Win10 Pro N, Win10 Home, Win10 Pro Insider Fast Ring, Windows 8.1 Pro, Ubuntu
       12 Jun 2018 #168

    cereberus said: View Post
    Hyper-V is more closely integrated with Host than other virtual machines i.e. has more direct access to host resources. Other VMs interface more indirectly. Could that be the reason why Hyper-V vms get the updates but other VMs do not?
    That's possible, depending on the VMs settings such as integration, and security.


    Note, my Win8.1 pro VM is also protected.
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  10. Cliff S's Avatar
    Posts : 21,653
    Win10 Pro, Win10 Pro N, Win10 Home, Win10 Pro Insider Fast Ring, Windows 8.1 Pro, Ubuntu
       12 Jun 2018 #169

    Using the right click "show tech details"
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    Gave me the same information for Host, Win10 insider, and Win8.1:

    Code:
    This 64-bit OS on Intel Processor:
     OS is Meltdown aware:  Yes
     OS is Spectre aware:  Yes
     OS Meltdown data:  0x003D
     OS Spectre data:  0x00F9
     PCID/INVPCID support:  Yes / Yes
     CPU microcode updated: Yes
     CPU is meltdown vulnerable: Yes
    This system's processor identification:
     Intel Core i7-8700K CPU @ 3.70GHz 
    Documentation of Meltdown (KVA) and Spectre (branch control speculation) bit flags returned by the NtQuerySystemInformation call which, when supported by updated versions of Windows as shown above, provides detailed information about Windows' management of these vulnerabilities:
     KVA (Meltdown Vulnerability) flags:
     ==================================
     0x01 KVA_SHADOW_ENABLED
     0x02 KVA_SHADOW_USER_GLOBAL
     0x04 KVA_SHADOW_PCID
     0x08 KVA_SHADOW_INVPCID
     Branch Prediction Speculation (Spectre) flags:
     ==================================
     0x01 BPB_ENABLED
     0x02 BPB_DISABLED_SYSTEM_POLICY
     0x04 BPB_DISABLED_NO_HW_SUPPORT
     0x08 SPEC_CTRL_ENUMERATED
     0x10 PRED_CMD_ENUMERATED
     0x20 IBRS_PRESENT
     0x40 STIBP_PRESENT
     0x80 SMEP_PRESENT
    The presence of the relatively recent PCID and INVPCID support allows Windows (when it chooses to take advantage of this) to protect against the Meltdown vulnerability without significant system performance impact.
    AMD processors do not require, do not offer, and do not need the PCID and INVPCID support since they are inherently invulnerable to Meltdown attack.
    "CPU microcode updated" indicates that this system is using recently updated Intel or AMD microcode which provides the control over branch prediction speculation required to allow an aware operating system to protect the system from the Spectre vulnerabilities.
    This application will run under WINE and can therefore be used on non-Windows systems. Although its operating system data may not be meaningful under WINE, its display of the underlying processor capabilities will be accurate.
     For more information see GRC's InSpectre web page 
    Copyright © 2018 by Gibson Research Corporation
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