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CVE-2019-1125 "SWAPGS" Is The Newest Spectre Vulnerability

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  • CVE-2019-1125 "SWAPGS" Is The Newest Spectre Vulnerability

    Phoronix: CVE-2019-1125 "SWAPGS" Is The Newest Spectre Vulnerability

    CVE-2019-1125 was made public today or also referred to as the "SWAPGS" vulnerability as a new variant of Spectre V1 affecting Windows and Linux and both AMD and Intel x86_64 processors...

    http://www.phoronix.com/scan.php?pag...19-1125-SWAPGS

  • #2
    More like the newest processor slowdown update.

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    • #3
      A few more of these and ARM chips will catch up with Intel speed wise.

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      • #4
        Originally posted by cl333r View Post
        A few more of these and ARM chips will catch up with Intel speed wise.
        If I read this correctly, they are just adding a couple of load fences:

        https://git.kernel.org/pub/scm/linux...042a75cf0ea24c

        https://www.felixcloutier.com/x86/lfence

        Those are cheap. Atomic instructions cost more. The impact of this should be minimal.
        Last edited by ryao; 08-06-2019, 08:57 PM.

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        • #5
          He, he, one another of these known but hidden from the public... and more to come

          Assigned (20181126)

          Boring

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          • #6
            What's 70% of 5 Ghz again? 9900k users want to know.

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            • #7
              Originally posted by cl333r View Post
              A few more of these and ARM chips will catch up with Intel speed wise.
              Yeah, start overclocking your Pi and see how far you can get

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              • #8
                Originally posted by phoronix View Post
                and according to mixed information, AMD
                What is the mixed information? In the kernel patch it directly says that
                Originally posted by git.kernel.org
                On AMD, this variant isn't possible because swapgs is serializing with respect to future GS-based accesses.
                So how can you speculate beyond that?

                On another note, it turned out to be a good thing for one more reason that the Intel FSGSBASE support patches were rejected...
                https://www.phoronix.com/scan.php?pa...SBASE-Reverted

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                • #9
                  Originally posted by chithanh View Post
                  So how can you speculate beyond that?
                  Well, AMD is not affected by meltdown, l1tf and mds. But by spectre in general it potentionally is.

                  Now Zen 2 have fixed some of the spectres, so it is more unclear in that spectre if or which are and which are not

                  If they speak about AMD in general there, then yeah not affected
                  Last edited by dungeon; 08-07-2019, 12:08 AM.

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                  • #10
                    Originally posted by dungeon View Post
                    Yeah, start overclocking your Pi and see how far you can get
                    Should I overclock my Snapdragon 850? It's seems like 850 is overclocked version 835.

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