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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Rich Felker‏ @RichFelker 29 Jan 2016

      Rich Felker Retweeted joernchen

      TL;DR systemd automounts some useless EFI fw pseudo-fs that makes rm -rf / brick your motherboard.https://twitter.com/joernchen/status/693065577284374528 …

      Rich Felker added,

      joernchen @joernchen
      https://github.com/systemd/systemd/issues/2402 … ZOMFG (via IRC)
      10 replies 143 retweets 57 likes
    2. CopperheadOS‏ @CopperheadOS 29 Jan 2016
      Replying to @RichFelker

      @RichFelker It's needed for EFI applications like bootloaders to install themselves. EFI is stupid. Shouldn't be possible to brick a device.

      3 replies 1 retweet 5 likes
    3. Rich Felker‏ @RichFelker 29 Jan 2016
      Replying to @CopperheadOS

      @CopperheadSec Bootloader installation is a one-time thing that should never happen once an OS is installed.

      1 reply 0 retweets 0 likes
    4. CopperheadOS‏ @CopperheadOS 29 Jan 2016
      Replying to @RichFelker

      @RichFelker They like to keep themselves up-to-date. In theory, it could potentially be important to fix something like a verified boot bug.

      2 replies 0 retweets 1 like
      Rich Felker‏ @RichFelker 29 Jan 2016
      Replying to @CopperheadOS

      @CopperheadSec I think allowing modifications to the bootloader after install is a bigger risk than not upgrading the bootloader.

      10:14 AM - 29 Jan 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker 29 Jan 2016
          Replying to @RichFelker

          @CopperheadSec The bootloader should not be exposed to any input at all except the drive containing the kernel it's loading.

          1 reply 0 retweets 0 likes
        3. CopperheadOS‏ @CopperheadOS 29 Jan 2016
          Replying to @RichFelker

          @RichFelker The kernel it's loading is untrusted input with verified boot though. It prevents persistent compromise on ChromeOS and Android.

          1 reply 0 retweets 0 likes
        4. CopperheadOS‏ @CopperheadOS 29 Jan 2016
          Replying to @CopperheadOS

          @RichFelker They are really careful about updating the bootloader though. They have 2 sets of bootloader partitions so they can swap them.

          1 reply 0 retweets 0 likes
        5. CopperheadOS‏ @CopperheadOS 29 Jan 2016
          Replying to @CopperheadOS

          @RichFelker At least LG does it that way: https://android.googlesource.com/device/lge/bullhead/+/android-6.0.1_r10/releasetools.py#136 …. Not sure if the Nexus Player (x86_64) and Chromebooks are that careful...

          1 reply 0 retweets 0 likes
        6. CopperheadOS‏ @CopperheadOS 29 Jan 2016
          Replying to @CopperheadOS

          @RichFelker Why it's important: recovery updates OS, OS updates recovery, so root can write recovery and bootloader needs to verify on boot.

          1 reply 0 retweets 1 like
        7. CopperheadOS‏ @CopperheadOS 29 Jan 2016
          Replying to @CopperheadOS

          @RichFelker The boot partition (kernel, init) can just be read-only from within the OS but not recovery and recovery could be compromised.

          0 replies 0 retweets 0 likes
        8. End of conversation

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