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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 3 Jan 2018
      • Report Tweet
      • Report NetzDG Violation

      On first glance it looks like many CPUs are vulnerable to same-privilege mis-speculation leaks (e.g. in JIT engines - disable eBPF jit if you have it enabled), but Intel has the real SNAFU in letting it leak across privilege modes.

      2 replies 27 retweets 37 likes
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    2. Hector Martin‏ @marcan42 3 Jan 2018
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      • Report NetzDG Violation

      Then there's the branch target misprediction attack; it seems to rely a lot on the details of Intel branch prediction, but it's unclear whether other CPUs are affected by variants of it. Maybe this is patchable in microcode?

      3 replies 7 retweets 10 likes
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    3. Ridley @ a safe distance‏ @11rcombs 3 Jan 2018
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      Replying to @marcan42

      The branch one is described as affecting ARM and AMD, if I’m reading right?

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 3 Jan 2018
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      Replying to @11rcombs

      It doesn't seem to be clear to what extent. It's heavily uarch specific and the research seems to have focused on Intel.

      4:42 PM - 3 Jan 2018
      0 replies 0 retweets 0 likes

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