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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 25 Sep 2017
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      TrustZone is broken as implemented in most devices, and nobody was surprised. https://blog.acolyer.org/2017/09/21/clkscrew-exposing-the-perils-of-security-oblivious-energy-management/ …

      1 reply 91 retweets 116 likes
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    2. Hector Martin‏ @marcan42 25 Sep 2017
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      Seriously, anyone who's ever looked at a SoC datasheet (and it's all accessible at *kernel* level, below TrustZone) knew this was coming.

      1 reply 4 retweets 4 likes
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    3. Hector Martin‏ @marcan42 25 Sep 2017
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      Modern SoCs are way, WAY too complicated. The only way to secure them is to move all the ugly hardware mgmt bits into TrustZone itself.

      1 reply 2 retweets 12 likes
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    4. Hector Martin‏ @marcan42 25 Sep 2017
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      Which of course increases your TZ attack surface. You can't have your cake and eat it too.

      1 reply 2 retweets 7 likes
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    5. Alexander Tarasikov‏ @astarasikov 25 Sep 2017
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      Replying to @marcan42

      Or have a separate CPU to do power Mgmt. And have a bunch of angry power folks yelling "but muh latencies"

      2 replies 0 retweets 2 likes
    6. Hector Martin‏ @marcan42 25 Sep 2017
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      Replying to @astarasikov

      Or have a separate CPU doing security. Which is what Apple did.

      2 replies 0 retweets 11 likes
    7. Cristofaro Mune‏ @pulsoid 27 Sep 2017
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      Replying to @marcan42 @astarasikov

      That would have not addressed the attack, unless Pwr Mgmt regs again not reachable by REE. FI via CLK & VCC HW manipulation might also work.

      1 reply 0 retweets 0 likes
    8. Hector Martin‏ @marcan42 27 Sep 2017
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      Replying to @pulsoid @astarasikov

      AIUI they have environmental monitoring in their security CPU (anti-glitching etc). Also speed/per regs for main core are not relevant.

      1 reply 0 retweets 0 likes
    9. Cristofaro Mune‏ @pulsoid 27 Sep 2017
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      Replying to @marcan42 @astarasikov

      If you have dedicated countermeasures some attacks become less possible. But that is due to countermeasures, not to separate CPU design.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 27 Sep 2017
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      Replying to @pulsoid @astarasikov

      A separate CPU makes some countermeasures practical and significantly reduces the attack surface.

      8:03 AM - 27 Sep 2017
      1 reply 0 retweets 0 likes
        1. Cristofaro Mune‏ @pulsoid 27 Sep 2017
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          Replying to @marcan42 @astarasikov

          I may agree, but u would still to factor in those countermeasures for at least one CPU. The point here was that they were not there at all.

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