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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 13 Jan 2017
      • Report Tweet
      • Report NetzDG Violation

      FUD aside, I'm taking a look at the Intel DCI protocol (JTAG over USB3). Doesn't look very complicated. OpenOCD for Skylake anyone?pic.twitter.com/eXE5n4I00R

      5 replies 24 retweets 72 likes
    2. Paweł Lasek‏ @pawel_lasek 14 Jan 2017
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      Replying to @alt_kia @marcan42

      I'm worried about scenario of "plug usb kit, hard reboot, implant". Once the OS is running, it's usually quite harder

      1 reply 0 retweets 1 like
    3. Hector Martin‏ @marcan42 14 Jan 2017
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      Replying to @pawel_lasek @alt_kia

      There's more than one TAP accessible via DCI. Wouldn't be surprised if you could still take over w/o x86 JTAG.

      1 reply 0 retweets 1 like
    4. Hector Martin‏ @marcan42 14 Jan 2017
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      Replying to @marcan42 @pawel_lasek @alt_kia

      But really the whole point is this should be disabled in PCH from boot.

      1 reply 0 retweets 1 like
    5. Hector Martin‏ @marcan42 14 Jan 2017
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      Replying to @marcan42 @pawel_lasek @alt_kia

      It's trivial to check if you're vulnerable. Connect USB3 crossover cable to host, reboot. If it ever enumerates, vuln.

      1 reply 0 retweets 0 likes
    6. Paweł Lasek‏ @pawel_lasek 14 Jan 2017
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      Replying to @marcan42 @alt_kia

      So you just need a crossover and it works? Nice... Do the debug serial port work that way?

      2 replies 0 retweets 0 likes
    7. Paweł Lasek‏ @pawel_lasek 14 Jan 2017
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      Replying to @pawel_lasek @marcan42 @alt_kia

      Also, someone needs to check if you can reflash firmware that way... some legitimate use for non-attackers

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 14 Jan 2017
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      Replying to @pawel_lasek @alt_kia

      I'm going to try to use it for Linux kernel debugging... plenty of legitimate uses. BIOS hacking too.

      2:09 AM - 14 Jan 2017
      2 replies 0 retweets 0 likes
        1. New conversation
        1. Paweł Lasek‏ @pawel_lasek 14 Jan 2017
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          Replying to @marcan42 @alt_kia

          yep. Thought about changing the softstrap before messing with firmware so you could in theory restore it...

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 14 Jan 2017
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          Replying to @pawel_lasek @alt_kia

          Well, if x86 runs any code, and you have JTAG, you can just commandeer it to write flash... Not sure about before that

          0 replies 0 retweets 0 likes
          3. End of conversation
        1. Hector Martin‏ @marcan42 14 Jan 2017
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          Replying to @marcan42 @pawel_lasek @alt_kia

          Pretty sure I can get an OpenOCD iface driver for DCI done by tomorrow. Working out Intel JTAG though, different story

          0 replies 0 retweets 0 likes
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