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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. olddellian‏ @olddellian 2 Nov 2018
      • Report Tweet
      • Report NetzDG Violation

      olddellian Retweeted Hector Martin

      PortSmash CVE-2018-5407 - @RaptorEng @IBMPowerSystems Any comments on how vulnerable #POWER9 is to this kind of attack? Especially with regard to the Nimbus SMT4 core pairs being very similar to single SMT8 Cumulus cores. @RaptorCompSys, your 8 & 4 core chips are unpaired, right?https://twitter.com/marcan42/status/1058405454999543808 …

      olddellian added,

      Hector Martin @marcan42
      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.
      Show this thread
      2 replies 1 retweet 3 likes
    2. Hector Martin‏ @marcan42 2 Nov 2018
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      • Report NetzDG Violation
      Replying to @olddellian @RaptorEng and

      There is no way around the fact that if you have two threads dynamically sharing compute resources, one thread will always be able to influence the other, and/or measure the other's influence. Otherwise they aren't really sharing resources, just partitioning them.

      1 reply 0 retweets 1 like
    3. roothorick‏ @roothorick 2 Nov 2018
      • Report Tweet
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      Replying to @marcan42 @olddellian and

      The obvious workaround is to only allow threads that "trust each other" to share resources, e.g. part of the same process so they can directly access each others' memory anyway. That's probably how it should've been done right from the start.

      1 reply 0 retweets 1 like
      Hector Martin‏ @marcan42 2 Nov 2018
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      Replying to @roothorick @olddellian and

      Hector Martin Retweeted Hector Martin

      Yup. I don't know why nobody is rushing to get this implemented, it should've been obvious since the first batch of vulns.https://twitter.com/marcan42/status/1058415187672260608 …

      Hector Martin added,

      Hector Martin @marcan42
      Replying to @RaptorCompSys @olddellian and 2 others
      What we really need is kernel scheduling support for atomically grouping tasks by security context and integrity level, and better isolation controls on task switching (e.g. more aggressive cache flushes).
      10:51 AM - 2 Nov 2018
      • 1 Like
      • Raptor Computing Sys
      0 replies 0 retweets 1 like

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