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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 22 Oct 2014
      • Report Tweet
      • Report NetzDG Violation

      Assume ALL devices are brickable by evil code unless proven otherwise. This isn't news. Most devices make no attempt to protect themselves.

      6 replies 43 retweets 24 likes
    2. Simon L. B. Nielsen‏ @simonlbn 23 Oct 2014
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      Replying to @marcan42

      .@marcan42 Do you know if the problematic commands require admin access to send on common OSes, or can normal users send them too?

      1 reply 0 retweets 0 likes
    3. Diego Elio Pettenò‏ @flameeyes 23 Oct 2014
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      Replying to @simonlbn

      . @simonlbn @marcan42 I know for a fact that for some USB devices, libusb access from user on Linux is enough to access firmware.

      1 reply 0 retweets 0 likes
    4. Hector Martin‏ @marcan42 23 Oct 2014
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      Replying to @flameeyes

      @flameeyes For essentially all, but that's conditional on having usbdev access to begin with. I don't think all distros do that?

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 23 Oct 2014
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      Replying to @marcan42

      @flameeyes I mean, I do of course; I mess around with USB devices too often not to just give myself blanket usb group access :-)

      1 reply 0 retweets 0 likes
    6. Diego Elio Pettenò‏ @flameeyes 23 Oct 2014
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      Replying to @marcan42

      @marcan42 yeah but I've seen plenty that give the console user full access before. Would be surprised if it doesn't happen again.

      1 reply 0 retweets 0 likes
    7. Hector Martin‏ @marcan42 23 Oct 2014
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      Replying to @flameeyes

      @flameeyes Yeah, ISTR that consolekit/whatever is set up like that these days often. Dangerous indeed.

      1 reply 0 retweets 0 likes
    8. Hector Martin‏ @marcan42 23 Oct 2014
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      Replying to @marcan42

      @flameeyes I think the kernel has filtering for FW commands on SCSI devs (need access to burn discs). No such thing possible for USB devs :(

      1 reply 0 retweets 0 likes
    9. Diego Elio Pettenò‏ @flameeyes 23 Oct 2014
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      Replying to @marcan42

      @marcan42 it does filtering by command because they are standardized (and anything not recognized is considered privileged)...

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 23 Oct 2014
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      Replying to @flameeyes

      @flameeyes Yeah, that's what I meant when I said it wasn't possible for USB devices.

      4:04 AM - 23 Oct 2014
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Diego Elio Pettenò‏ @flameeyes 23 Oct 2014
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          Replying to @marcan42

          @marcan42 it might be possible for some devices if you know what the standard interface for them is. But then you would have kernel drivers…

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 23 Oct 2014
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          Replying to @flameeyes

          @flameeyes Yeah, most of the well-known devices end up having kernel drivers anyway.

          1 reply 0 retweets 0 likes
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