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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 2 Nov 2018
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      Allow me to summarize x86 side channel attacks: Spectre v1: speculation is insecure by design Spectre v2: secure branch prediction matters Meltdown: Intel are dumbasses L1TF: Intel are monumental, inexcusable dumbasses PortSmash: hyperthreading is insecure by design

      26 replies 620 retweets 1,290 likes
      Show this thread
    2. David Kanter‏ @TheKanter 2 Nov 2018
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      Replying to @marcan42

      You realize that Apple, IBM, and probably a few others also had Meltdown vulnerabilities, right? It’s not like Intels engineers were unique in their TLB design.

      2 replies 0 retweets 12 likes
    3. Hector Martin‏ @marcan42 2 Nov 2018
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      Replying to @TheKanter

      Meltdown is not about the TLB, it's about their CPUs speculating on data that has not passed privilege checks. ARM also managed to screw it up but only on one core. Yes Apple and IBM also messed up. They're all dumbasses, but then Intel went "hold my beer" and L1TF happened.

      1 reply 0 retweets 53 likes
    4. David Kanter‏ @TheKanter 2 Nov 2018
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      Replying to @marcan42

      It’s 100% about when you check privileges in the TLB access pipeline. If you check eagerly you are fine, lazily —> Meltdown.

      1 reply 0 retweets 6 likes
    5. Hector Martin‏ @marcan42 2 Nov 2018
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      Replying to @TheKanter

      What I mean is the problem isn't the TLB itself, it's what you do with the data when the TLB hits but you don't pass the privilege check. They should be eagerly dropping/poisoning it instead of steamrolling forward on privileged data.

      2 replies 0 retweets 15 likes
      Hector Martin‏ @marcan42 2 Nov 2018
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      Replying to @marcan42 @TheKanter

      Of course, it takes a very special kind of idiocy to not only do that but *also* use garbage address data on nonpresent pages *and* short-circuit EPT while you're at it, which is L1TF and an Intel exclusive.

      12:57 PM - 2 Nov 2018
      • 1 Retweet
      • 16 Likes
      • Aaron Horton u a Germán Ríos González Wojciech Bednarski Alex Fanat marku5 ガリ マット です、はじめまして Deirdre Connolly¹ Hostilio Macias
      1 reply 1 retweet 16 likes
        1. Real AI‏ @Luiz0x29A 3 Nov 2018
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          Replying to @marcan42 @TheKanter

          Intel is terrible at security. when your hardware is more secure with the security features like ME disabled it says all you need to know about sloopy security

          0 replies 0 retweets 8 likes
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