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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. damageboy‏ @damageboy 13 Nov 2019
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      A small s**tstorm is heading your way, if you're in the business of running code on Intel computers. Here's a sad story about the state of computing in 2019. It'll take a couple of tweets, but it's actually kind of important (?), so please retweet so this gets proper attention:

      15 replies 840 retweets 1,279 likes
      Show this thread
    2. George Furbish‏ @geofurb 14 Nov 2019
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      Replying to @damageboy

      Is nobody attacking AMD, or is there some difference in design philosophy that has spared them from this wave of chip attacks?

      4 replies 0 retweets 14 likes
    3. Hector Martin‏ @marcan42 14 Nov 2019
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      Replying to @geofurb @damageboy

      This isn't a chip attack, it's a stupid design bug. That said, there *is* a difference in design philosophy. Intel has chosen performance over any kind of design sanity / safety, every time, it seems as a systematic rule. AMD hasn't.

      2 replies 11 retweets 87 likes
    4. Hector Martin‏ @marcan42 14 Nov 2019
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      Replying to @marcan42 @geofurb @damageboy

      So while both AMD and Intel have been equally hit by the general idea of speculation-based leaks in userland code (nothing the CPU can do about that), Intel has also had a huge pile of massively privilege-crossing speculation leaks that AMD hasn't.

      2 replies 2 retweets 25 likes
      Hector Martin‏ @marcan42 14 Nov 2019
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      Replying to @marcan42 @geofurb @damageboy

      Because the Intel philosophy seems to have been "ignore security/sanity until the instruction retires", so all kinds of batshit insane stuff happens in speculation on Intel CPUs (like bypassing guest VM page tables or loading bad or privileged data) which doesn't on AMD.

      8:12 AM - 14 Nov 2019
      • 2 Retweets
      • 36 Likes
      • Concerned Citizen nop3 Matt Mullins aoife InnovativeMethods Emelia/Emi George Furbish Ozzelot James Tryand
      3 replies 2 retweets 36 likes
        1. New conversation
        2. George Furbish‏ @geofurb 14 Nov 2019
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          Replying to @marcan42 @damageboy

          Thanks! Just wasn't sure if AMD was actually more secure or if it was about who people tried to attack more.

          1 reply 0 retweets 1 like
        3. Ben Mitchell‏ @A_MrBenMitchell 15 Nov 2019
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          Replying to @geofurb @marcan42 @damageboy

          However, recently AMD has been outperforming intel. For example they have PCI 4.0 and also a 16 core (Desktop) processor that runs nicely above 4ghz They also use a smaller lithography 7 vs 10

          1 reply 0 retweets 0 likes
        4. Show replies
        1. New conversation
        2. Alan Coopersmith‏ @alanc 15 Nov 2019
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          Replying to @marcan42 @geofurb @damageboy

          Alan Coopersmith Retweeted Dan Luu

          See also:https://twitter.com/danluu/status/686241276472082432?s=21 …

          Alan Coopersmith added,

          Dan Luu @danluu
          We saw some really bad Intel CPU bugs in 2015, and we should expect to see more in the future: http://danluu.com/cpu-bugs/ 
          1 reply 1 retweet 1 like
        3. damageboy‏ @damageboy 15 Nov 2019
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          Replying to @alanc @marcan42 @geofurb

          Oh yeah, that was a good one... I remember this without even reading it!

          0 replies 0 retweets 1 like
        4. End of conversation
        1. New conversation
        2. SteakisGood‏ @SteakandChickn 17 Nov 2019
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          Replying to @marcan42 @geofurb @damageboy

          This “ignore security/sanity” sentiment that intel “has” is completely false; Intel internally has never had that philosophy. That’s something cooked up by reddit trolls.

          1 reply 0 retweets 0 likes
        3. Hector Martin‏ @marcan42 17 Nov 2019
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          Replying to @SteakandChickn @geofurb @damageboy

          The evidence is damning. All those speculation bugs Intel had due to cross-privilege leakage prior to retirement make it clear. It's not once or twice, it's a pattern.

          1 reply 0 retweets 3 likes
        4. Show replies

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