Meltdown and Spectre - Page 2
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  1. #16
    Join Date
    Dec 2012
    Location
    santa barbara, CA
    Posts
    926

    Re: Meltdown and Spectre

    Quote Originally Posted by normvcr
    My F26 x86 4.14.11 system also hangs during boot after starting the window manager -- the screen remains in ascii mode with the usual boot log. Fortunately, I am able to boot into 4.14.8 .
    in my same case, i had to redownload nvidias new proprietary driver and fully reinstall it.
    nouveau had crawled back in from the hole, to ruin my day again.
    in my case, the rpmfusion solution does not seem to work since FC26.
    "monsters John ... monsters from the ID..."
    "ma vule teva maar gul nol naya"

  2. #17
    Join Date
    Aug 2005
    Posts
    119

    Re: Meltdown and Spectre

    I have put "nopti" at the end of the boot line, to no avail. Have filed bug
    https://bugzilla.redhat.com/show_bug.cgi?id=1534031

  3. #18
    Join Date
    Feb 2009
    Location
    Florida
    Posts
    642

    Re: Meltdown and Spectre

    Quote Originally Posted by HaydnH
    @Kobuck and normvcr, have you tried the steps in the "how to turn it off" thread in this forum?
    "nopti" had no effect. I'm guessing the changes to allow the Intel fix are somehow tipping my machine over. I'm now running "4.14.13-300.fc27.x86_64" and I seem to be back in business.

    I don't want to say it too loud and wake a sleeping dog.
    Laptop: Toshiba / Intel B960 2.20Ghz x2/ 4GB/ 320GB SataII/ Intel HD/ fc28.x86_64
    Tower: GigaByte (970A) / AMD FX 8320 3.5Ghz x8/ 16GB/ 9TB Sata III/ AMD 6770HD/ fc28.x86_64
    Bookshelf: Shuttle DS61 (H61)/ i3-3225 3.3Ghz x2/ 16GB/ 320GB Sata II/ Intel HD 4000/ fc27.x86_64
    Embedded: BeagleBone Blk / ARM AM3358 1 GHz x1/ 512MB/ 2GB eMMC/ PowerVR SGX530/ fc27.armv7hl

  4. #19
    Join Date
    Dec 2013
    Location
    United Kingdom
    Posts
    6,382

    Re: Meltdown and Spectre

    try pti=no which is the other version of the same command.

  5. #20
    Join Date
    Feb 2009
    Location
    Florida
    Posts
    642

    Re: Meltdown and Spectre

    Just did 4 reboots switching between "4.14.11-300.fc27.x86_64" and "4.14.13-300.fc27.x86_64" at each boot.
    Using the kernel updates as supplied (no use of kernel line options like "nopti" or "pti=no" )

    4.14.11-300.fc27.x86_64 = 2 boot hangs
    4.14.13-300.fc27.x86_64 = 2 successful boots

    Just FYI.
    Laptop: Toshiba / Intel B960 2.20Ghz x2/ 4GB/ 320GB SataII/ Intel HD/ fc28.x86_64
    Tower: GigaByte (970A) / AMD FX 8320 3.5Ghz x8/ 16GB/ 9TB Sata III/ AMD 6770HD/ fc28.x86_64
    Bookshelf: Shuttle DS61 (H61)/ i3-3225 3.3Ghz x2/ 16GB/ 320GB Sata II/ Intel HD 4000/ fc27.x86_64
    Embedded: BeagleBone Blk / ARM AM3358 1 GHz x1/ 512MB/ 2GB eMMC/ PowerVR SGX530/ fc27.armv7hl

  6. #21
    Join Date
    Aug 2005
    Posts
    119

    Re: Meltdown and Spectre

    Quote Originally Posted by antikythera
    try pti=no which is the other version of the same command.
    Same problem using "pti=no"

  7. #22
    Join Date
    Jan 2018
    Location
    US
    Posts
    1

    Re: Meltdown and Spectre

    So when is Fedora going to patch Spectre varient 1 at least? It looks like CentOS has already, why not Fedora?

    See chart:

    http://i.imgur.com/hZjrZYz.png
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  8. #23
    Join Date
    Jun 2004
    Location
    Maryland, US
    Posts
    7,368

    Re: Meltdown and Spectre

    Quote Originally Posted by normvcr
    Same problem using "pti=no"
    what occurs if you do the "runtime disable" shown here:

    https://access.redhat.com/articles/3311301

    # echo 0 > /sys/kernel/debug/x86/pti_enabled
    # echo 0 > /sys/kernel/debug/x86/ibpb_enabled
    # echo 0 > /sys/kernel/debug/x86/ibrs_enabled

  9. #24
    Join Date
    Aug 2005
    Posts
    119

    Re: Meltdown and Spectre

    I put noibrs noibqb nopti at the end of the boot. Same problem persists.

  10. #25
    Join Date
    Aug 2005
    Posts
    119

    Re: Meltdown and Spectre

    Installed F26 4.14.13.200 . Default boot hangs (did not add noibrs noibqb nopti ) to boot line. I may be installing F27 sooner than I had planned. F28 is not scheduled until May.

  11. #26
    Join Date
    Oct 2010
    Location
    Canberra
    Posts
    2,992

    Re: Meltdown and Spectre

    Linus isn't very happy with Intel:
    https://lkml.org/lkml/2018/1/21/192

  12. #27
    Join Date
    Dec 2013
    Location
    United Kingdom
    Posts
    6,382

    Re: Meltdown and Spectre

    Quote Originally Posted by ocratato
    Linus isn't very happy with Intel:
    https://lkml.org/lkml/2018/1/21/192
    a quick summary of the above linked mailing list post for people who can't be bothered reading through it all

    Click image for larger version. 

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  13. #28
    Join Date
    Jun 2005
    Location
    Montreal, Que, Canada
    Posts
    5,395

    Why Intel x86 must die

    ZDNET

    http://www.zdnet.com/article/why-intel-x86-must-die-our-cloud-centric-future-depends-on-open-source-chips-meltdown/


    Why Intel x86 must die: Our cloud-centric future depends on open source chips

    Perhaps the Meltdown and Spectre bugs are the impetus for making long-overdue changes to the core DNA of the semiconductor industry and how chip architectures are designed.

    By Jason Perlow for Tech Broiler | January 18, 2018 -- 17:38 GMT (09:38 PST) | Topic: Cybersecurity in an IoT and Mobile World
    Leslie in Montreal

    Interesting web sites list
    http://forums.fedoraforum.org/showth...40#post1697840

  14. #29
    Join Date
    Jun 2005
    Location
    Montreal, Que, Canada
    Posts
    5,395

    Re: Meltdown and Spectre

    Steps are being taken by the US government to create a new non-intel architecture.
    Leslie in Montreal

    Interesting web sites list
    http://forums.fedoraforum.org/showth...40#post1697840

  15. #30
    Join Date
    Oct 2010
    Location
    Canberra
    Posts
    2,992

    Re: Why Intel x86 must die

    As I read it the article is proposing something like the ARM model, but where the intellectual property is open and free to use by any chip fabricator.

    I am not sure that can work. There must be a fair amount prototyping work to get a design that is reliable, and that costs real money.

    It would not solve this sort of problem either. It would be just as prone to bugs as any other development model, and the bugs would be equally impossible to resolve - you cannot fix something that is baked into the silicon.

    Perhaps what is needed is a chip design where there is some scope for making repairs. Modern chips already use microcode, but perhaps a layer using a reprogrammable FPGA might enable some design flaws to be fixed. Of course no one is going to do that without some sort of financial incentive, so some class actions against Intel might prompt them to do something along those lines.

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