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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
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    2. Hector Martin‏ @marcan42 2 Nov 2018
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      And yes, Spectre v1 and PortSmash aren't going away. Anyone who knows anything about CPUs knew PortSmash was theoretically possible for years (just someone bothered to finally implement it). Disable HT or petition OSes to do security-domain-aware HT by default.

      3 replies 24 retweets 109 likes
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    3. Hector Martin‏ @marcan42 2 Nov 2018
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      Also PortSmash should be adaptable to AMD systems with HT (i.e. Zen) and also all the POWER stuff. And it gets worse, because under more specific circumstances and with cleverer exploits, the side channels go beyond HT and to shared caches too.

      7 replies 17 retweets 87 likes
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    4. Hector Martin‏ @marcan42 2 Nov 2018
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      Ultimately, computing needs to come to terms with the fact that any time there is *any* shared resource, that's ripe for side channels. This includes main memory and peripheral devices. It's worse and more insidious the lower level and more tightly coupled you make it, like HT.

      6 replies 52 retweets 182 likes
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      Hector Martin‏ @marcan42 11 Nov 2018
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      I have no idea what this "walled garden" you speak of is. You can experiment all you want at home. If you're #46 on the Fortune 500 list you do not get to "experiment, make mistakes, and make #insecure things" that you then sell to customers.

      9:37 PM - 11 Nov 2018
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        2. Hector Martin‏ @marcan42 11 Nov 2018
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          Just because companies get to do awful things doesn't mean they should. If you don't care about security, that's great. Feel free to post your password on Twitter. Most of the rest of the world cares.

          0 replies 0 retweets 0 likes
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