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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 3 Jan 2019
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      Anyway, if you rely on BitLocker in TPM mode (boot without PIN), you should know that anyone can steal your computer, sniff 32 bytes off of the LPC bus, stick them into libbde, and decrypt your disk. Yes, it's that easy. Solder 7 wires to $favorite_fpga_board, decrypt drive.

      29 replies 614 retweets 1,105 likes
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    2. Hector Martin‏ @marcan42 3 Jan 2019
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      We all knew it was going to be this dumb, but today I'm here to tell you it *is* this dumb and I just implemented it.

      4 replies 29 retweets 139 likes
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      Hector Martin‏ @marcan42 3 Jan 2019
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      Also many computers (e.g. anything with an external TPM module, but also the many that have LPC on a debug or other extension port) have headers for LPC, so then you don't even need to solder anything.

      9:00 AM - 3 Jan 2019
      • 11 Retweets
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      5 replies 11 retweets 76 likes
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        2. Graham Sutherland (Polynomial^DSS)‏ @gsuberland 3 Jan 2019
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          Replying to @marcan42

          I should really get in on this LPC fun. I've been meaning to do some stuff with SMBus sniffing on PCIe and DIMM slots for ages but LPC now seems like it would be more interesting.

          1 reply 0 retweets 3 likes
        3. Hector Martin‏ @marcan42 3 Jan 2019
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          Replying to @gsuberland

          It's just 33MHz, it's slow as heck by modern standards.

          0 replies 0 retweets 3 likes
        4. End of conversation
        1. 𝓬𝓸𝓾𝓰𝓾𝓪𝓻𝓲𝓾𝓰𝓪‏ @couguariuga 3 Jan 2019
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          Replying to @marcan42

          Platforms with plugged modules are expected to be in a secure environment. If you care about theft of your vault, install a better lock cylinder, lock it and don't put the key underneath the doormat.

          0 replies 0 retweets 2 likes
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        1. Paweł Lasek‏ @pawel_lasek 4 Jan 2019
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          Replying to @marcan42

          It's why TALOS2 got a point-to-point LPC bus (and why several laptops clear TPM when opened up)

          0 replies 0 retweets 2 likes
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        1. vysecurity  🥽‏ @vysecurity 4 Jan 2019
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          Replying to @marcan42

          I found that if you make the fan do a failure, the machine stops. Then if you boot the box again, it asks for bitlocker recovery key, if you skip and reboot, the box unlocks after a fan check too. 😎

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        1. Gavin Atkinson‏ @gavinatkinson 25 Jan 2019
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          Replying to @marcan42 @encthenet

          Fun fact: Several outsourced Lenovo laptops (especially 2013-2016 era) also bring the LPC header out onto otherwise unused pins of the wlan minipcie port, so you don't even need to take the machine apart.

          0 replies 2 retweets 4 likes
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