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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 9 Oct 2018
      • Report Tweet
      • Report NetzDG Violation

      Why is it that every time something like this happens nobody has any hard documentation or analysis results? Ah yes, the best cop-out. "We don't have it any more, we can't give you more details".pic.twitter.com/EooD0aIVyR

      4 replies 11 retweets 47 likes
      Show this thread
    2. Hector Martin‏ @marcan42 9 Oct 2018
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      So now we have *software* detecting *analog* stuff like the "power consumption" of a *network*. None of those words go together. At all.pic.twitter.com/h0W0R8cI7L

      6 replies 7 retweets 71 likes
      Show this thread
    3. Hector Martin‏ @marcan42 9 Oct 2018
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      Basically every Ethernet jack I've seen in anything but cheapo consumer routers/switches has been metal. How the hell is this an IOC?pic.twitter.com/1LG7tBe9MW

      4 replies 14 retweets 60 likes
      Show this thread
    4. Hector Martin‏ @marcan42 9 Oct 2018
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      Nevermind that... Ethernet jacks don't have power pins. Where is this module (that uses so much power that it gets hot) magically powering itself from? Nobody runs PoE out to servers. Did they modify the board design to add power pins too?

      6 replies 12 retweets 81 likes
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    5. Daniel Cincunegui  🧢‏ @danielcincu 9 Oct 2018
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      Replying to @marcan42

      Minor nit: power is available for the jack itself since it typically has two LEDs. So if you modified a jack previous to board mounting, you have power. Not enough to need heat dissipation, but enough to run a small chip.

      1 reply 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 9 Oct 2018
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      Replying to @danielcincu

      Not a small chip able to MITM 1000BASE-T. You aren't going to get more than 60mW from an LED.

      2 replies 0 retweets 1 like
    7. Daniel Cincunegui  🧢‏ @danielcincu 9 Oct 2018
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      Replying to @marcan42

      You don't get the power from the led, you draw power from its supply. It only needs to run the logic. You would get further intermitent power from the jack pins. Not backing the Bloomberg piece, just saying it's possible.

      1 reply 0 retweets 0 likes
    8. Hector Martin‏ @marcan42 9 Oct 2018
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      Replying to @danielcincu

      I'm talking about the LED supply. 20mA at 3V is the max any indicator LED will be powered at (a lot less these days). LEDs are current limited, so you don't get to draw more. That's 60mW. So no, not possible. Not going to draw any significant power off of the Ethernet pins either

      1 reply 0 retweets 0 likes
    9. Hector Martin‏ @marcan42 9 Oct 2018
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      Replying to @marcan42 @danielcincu

      *Maybe* if the LEDs are low side switched *and* the current limiting resistor is on the low side and you wire up yourself between anode and the connector shield you could steal more power, but that's a lot of maybes and assumptions about the board design.

      2 replies 0 retweets 0 likes
    10. Daniel Cincunegui  🧢‏ @danielcincu 9 Oct 2018
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      Replying to @marcan42

      Also, multiple jack parts have access to more led pins, so more power.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 9 Oct 2018
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      Replying to @danielcincu

      16 LEDs are still not enough to run dual 1000BASE-T PHYs + a CPU capable of using them.

      12:24 PM - 9 Oct 2018
      2 replies 0 retweets 0 likes
        1. New conversation
        1. Daniel Cincunegui  🧢‏ @danielcincu 9 Oct 2018
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          Replying to @marcan42

          Even in short bursts? Let's say you just want to MITM DNS requests. You don't need to run the jack full time. 0.01% of the time is plenty.

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 9 Oct 2018
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          Replying to @danielcincu

          How do you know when there's a DNS request happening without actually running the PHY?

          2 replies 0 retweets 0 likes
        3. Show replies
        1. Daniel Cincunegui  🧢‏ @danielcincu 9 Oct 2018
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          Replying to @marcan42

          BTW my issue with the Bloomberg piece is that hardware hacking presents too much of a risk to the hacker. Just arguing on the feasibility here.

          0 replies 0 retweets 0 likes
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