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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. Hector Martin‏ @marcan42 2 Feb 2018
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      Replying to @scanlime @tnare @drtune

      Well, the idea is that typically the code that needs performance isn't the security code. So if you can compartmentalize properly... Of course if both run on the same CPU that's still prone to microarchitectural nastygrams unless designed to basically reset on priv transitions.

      1 reply 0 retweets 1 like
    3. Hector Martin‏ @marcan42 2 Feb 2018
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      Replying to @marcan42 @scanlime and

      More realistically you just put all the security into a separate CPU and harden it as much as possible.

      1 reply 0 retweets 1 like
    4. DrTune‏ @drtune 3 Feb 2018
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      Replying to @marcan42 @scanlime @tnare

      I personally liked the PS3 thing when they hid the crypto in the SPU and then let you freely call it with anything you wanted to decrypt. Service with a smile!

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

      Not just that, the Cell architecture is such that you can boot the *secure bootloader* on that SPU and virtualize all I/O from insecure code. "Here we have this ultra secure CPU, of course you're allowed to control and lie to it about the outside world!"

      1 reply 0 retweets 1 like
      Hector Martin‏ @marcan42 3 Feb 2018
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      Replying to @marcan42 @drtune and

      Seriously at one point I had the secure isolated bootloader talking to virtualized SPI hardware... that was emulated on a Python script on my PC talking over the network.

      7:33 PM - 3 Feb 2018
      • 3 Likes
      • DrTune micah 'lime with barcode' elizabeth
      0 replies 0 retweets 3 likes

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