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Boffins find if you torture AMD Zen+, Zen 2 CPUs enough, they are vulnerable to Meltdown-like attack

Discussion in 'CPUs' started by Ice Tea, 31 Aug 2021.

  1. Ice Tea

    Mobster

    Joined: 1 Nov 2004

    Posts: 3,847

  2. jigger

    Capodecina

    Joined: 28 May 2007

    Posts: 15,579

    Time to move to Zen3 boss.
     
  3. mmj_uk

    Caporegime

    Joined: 26 Dec 2003

    Posts: 25,691

    Are they immune though? the paper talks about "Zen family" and lists only Zen+/Zen2 models as having being tested. Their conclusion sounds pretty generic but that it was only verified by them on Zen+/Zen2.
     
  4. jigger

    Capodecina

    Joined: 28 May 2007

    Posts: 15,579

    Zen 1 double jabbed
    Zen 2 double jabbed and tested positive for antibodies.
    Zen 3 double jabbed and tested positive for antibodies+Tcells
     
  5. mmj_uk

    Caporegime

    Joined: 26 Dec 2003

    Posts: 25,691

    Natural immunity is better so the question is did AMD find and fix the flaw before Zen3 launched? It just sounds like they didn't test any Zen3 CPU so didn't mention it.
     
  6. jigger

    Capodecina

    Joined: 28 May 2007

    Posts: 15,579

    Intel went the natural route and developed long COVID.
     
  7. humbug

    Caporegime

    Joined: 17 Mar 2012

    Posts: 38,998

    You shouldn't read too much in to how idiots write headlines, if they tested Zen and Zen 2 they will have tested Zen 3.
     
  8. Rroff

    Man of Honour

    Joined: 13 Oct 2006

    Posts: 78,318

    Eventually give it long enough these kind of attacks and other clever exploits will be found on just about any hardware if there is a reason for people to keep trying - not to say Intel could or couldn't have done more to prevent them in the first place but Intel's problem was just dragging out iterations of hardware for over a decade.

    Second paragraph of that article is pertinent:

    At least for desktop users most of these kind of attacks are a long way behind other forms of malware in terms of threat - though that can be a different story in server/multi-user (i.e. VM/VPS) environments.
     
  9. mmj_uk

    Caporegime

    Joined: 26 Dec 2003

    Posts: 25,691

    I read the paper it lists what CPU's were tested and there is no mention of a Zen3 processor, just the models in the article. If they had tested Zen3 it would be listed/mentioned along with the result of the test otherwise what would be the point in testing it.

    They didn't test an original Zen (1st gen) CPU either but you'd assume given that later models are affected by it then so will they be.
     
    Last edited: 31 Aug 2021
  10. humbug

    Caporegime

    Joined: 17 Mar 2012

    Posts: 38,998

    Strange that they didn't.
     
  11. Tee Hee Johnson

    Mobster

    Joined: 30 May 2007

    Posts: 4,512

    Location: Glasgow, Scotland

    I though AMD came out and said Zen 3 was susceptible?

    And not being as simple to exploit as Intel is moot, when has that ever stopped anyone.

    I dare to say it makes AMD a larger target, even simply for bragging rights.
     
  12. V F

    Capodecina

    Joined: 13 Aug 2003

    Posts: 19,044

    Location: UK

    I was just thinking while funny and not so funny, this Spectre/Meltdown thing feels like Covid variants for processors. It never goes away and keeps coming back to haunt them.
     
  13. Ice Tea

    Mobster

    Joined: 1 Nov 2004

    Posts: 3,847



    Steve mentions this at 26 mins and says 3000?
     
  14. Cyber-Mav

    Capodecina

    Joined: 30 Jul 2005

    Posts: 16,268

    Location: Midlands

    Theres probably a lot more security flaws with amd cpus but since they dont pay a bug bounty like intel do people dont go looking for the bugs.
     
  15. jigger

    Capodecina

    Joined: 28 May 2007

    Posts: 15,579

    Pretty sure other companies pay people to find bugs in AMD products…

    But lol, Intel’s payment is for silence! to keep the issues out of the public domain. How many flaws have Intel managed to hide so far?