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David3141593's profile
Dаvіd Вucһаnаn
Dаvіd Вucһаnаn
Dаvіd Вucһаnаn
@David3141593

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Dаvіd Вucһаnаn

@David3141593

from pwn import *; alias = "Retr0id"

Ring -1
da.vidbuchanan.co.uk
Joined December 2013

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    1. Dаvіd Вucһаnаn‏ @David3141593 19 Jul 2019
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      If any two USB-C "supporting" devices are connected together, the probability that one or both of them will be bricked tends towards 1, as time goes on. Sounds like it's impossible to implement the spec 100% correctly.

      4 replies 1 retweet 11 likes
    2. Grant Hernandez‏ @Digital_Cold 19 Jul 2019
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      Replying to @David3141593

      Interested in hearing more about your experience. Doing a lot of type-c research lately

      1 reply 0 retweets 1 like
      Dаvіd Вucһаnаn‏ @David3141593 19 Jul 2019
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      Replying to @Digital_Cold

      I had my laptop (Thinkpad X1 Extreme) connected to a dell monitor via USBC. The monitor lost power suddenly (electricity meter ran out, heh). /somehow/ this caused something in the laptop's usbc power management hardware to fry. The laptop's type C ports no longer deliver power.

      7:36 PM - 19 Jul 2019
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        2. Grant Hernandez‏ @Digital_Cold 19 Jul 2019
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          Replying to @David3141593

          Also to see if any USB-PD messages are being delivered, you may be able to tail /sys/kernel/debug/tcpm/* if you are running Linux.

          1 reply 0 retweets 0 likes
        3. Dаvіd Вucһаnаn‏ @David3141593 19 Jul 2019
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          Replying to @Digital_Cold

          I believe there were some tcpm related errors in dmesg. I'll paste some logs tomorrow

          1 reply 0 retweets 1 like
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        1. Dаvіd Вucһаnаn‏ @David3141593 19 Jul 2019
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          Replying to @David3141593 @Digital_Cold

          When I plug it back into the monitor, the monitor's USB hub functionality works, but the laptop does not see any actual displays attached.

          0 replies 0 retweets 2 likes
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        2. Grant Hernandez‏ @Digital_Cold 19 Jul 2019
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          Replying to @David3141593

          Hmm! That's a really interesting case. So your laptop was supposedly just providing video out, not power? Does dmesg give any hints when you plug in another type-c device to that port?

          1 reply 0 retweets 0 likes
        3. Dаvіd Вucһаnаn‏ @David3141593 19 Jul 2019
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          Replying to @Digital_Cold

          yes. The monitor is also capable of delivering power to the laptop, but not quite enough, so the laptop was also powered via a (non-usb) power adapter dmesg is silent.

          0 replies 0 retweets 0 likes
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