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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 Feb 2018
      • Report Tweet
      • Report NetzDG Violation

      Hector Martin Retweeted Bernhard Froemel

      Repeat after me: glitching works. Every time. If you don't have power, reset, and clock monitoring, your chip *will* be pwned. No exceptions.https://twitter.com/bernfroe/status/959405824840957952 …

      Hector Martin added,

      Bernhard Froemel @bernfroe
      Huh seems I am done :) In conclusion this is (with #chipwhisperer even more so!) a surprisingly simple secure boot attack on Nvidia Tegra210. Thanks @derrekr6, @hedgeberg, @shuffle2 & others for the info on switchbrew + reswitched sites & #34c3 Switch talk!! pic.twitter.com/NbNCvBWMRY
      Show this thread
      3 replies 29 retweets 92 likes
    2. DrTune‏ @drtune 2 Feb 2018
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      Replying to @scanlime @marcan42

      mm very heavily low-pass filtered I'd imagine. Not hard to do real glitch-attack detection but would be tradeoff with false triggers from regular pwr rail power noise. Seems very doable tho

      1 reply 0 retweets 0 likes
    3. Erant‏ @tnare 2 Feb 2018
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      Replying to @drtune @scanlime @marcan42

      Glitch detection is not a simple thing, especially on voltage rails. Clock glitch detection means you're sacrificing 10-20% of performance because you have to close timing at a higher frequency. Reset glitch monitoring is fairly trivial (synchronize/buffer the input).

      3 replies 0 retweets 3 likes
    4. Erant‏ @tnare 2 Feb 2018
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      Replying to @tnare @drtune and

      Voltage rail monitoring involves a high speed comparator, and a band gap. You have to put protections on the band gap to prevent an attack that makes it not start. If you have anything close to a high speed chip, your band gap needs tuning.

      1 reply 0 retweets 3 likes
    5. Erant‏ @tnare 2 Feb 2018
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      Replying to @tnare @drtune and

      This either means you're running with a crappy band gap early in boot and you tune it in software, or you're laser trimming at fab. Neither of which is free. And after all of this, you're still vulnerable to a dude with a laser pointer and a way to decap your chip :-)

      1 reply 0 retweets 3 likes
      Hector Martin‏ @marcan42 2 Feb 2018
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      • Report NetzDG Violation
      Replying to @tnare @drtune @scanlime

      Shhh, don't tell them about that one yet, that's on the secret stash still ;)

      11:22 AM - 2 Feb 2018
      0 replies 0 retweets 0 likes

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