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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. CopperheadOS‏ @CopperheadOS 15 Jun 2017
      Replying to @CopperheadOS @whitequark

      Enforcing screenshot prevention rules, mitigating cheating in games (not just competitive ones, but also just to force microtransactions).

      1 reply 0 retweets 3 likes
    2. CopperheadOS‏ @CopperheadOS 15 Jun 2017
      Replying to @CopperheadOS @whitequark

      Making fraud more expensive, DRM for media, and whatever other uses app developers end up coming up with for the SafetyNet API.

      1 reply 0 retweets 2 likes
    3. whitequark‏ @whitequark 15 Jun 2017
      Replying to @CopperheadOS

      I'm not sure how exactly that works in an ecosystem where vendors routinely add explicit backdoors, am I missing something

      1 reply 0 retweets 2 likes
    4. CopperheadOS‏ @CopperheadOS 15 Jun 2017
      Replying to @whitequark

      Google can mandate a universal boot chain + TrustZone implementation if they really wanted, which they already essentially do for ChromeOS.

      1 reply 0 retweets 2 likes
    5. CopperheadOS‏ @CopperheadOS 15 Jun 2017
      Replying to @CopperheadOS @whitequark

      If vendors want control over a TEE, they can provide their own. No reason that there has to be only one TEE on a mobile device.

      2 replies 0 retweets 3 likes
    6. whitequark‏ @whitequark 15 Jun 2017
      Replying to @CopperheadOS

      *blink* I don't get it. let's say we have a banking app. let's also say we have a vendor kernel that provides a "run under uid X" or even…

      1 reply 0 retweets 0 likes
    7. whitequark‏ @whitequark 15 Jun 2017
      Replying to @whitequark @CopperheadOS

      just "run in priv mode" primitive. this lets me capture/emulate user input & intercept 2FA, and transfer all money out. what am I missing?

      1 reply 0 retweets 1 like
    8. whitequark‏ @whitequark 15 Jun 2017
      Replying to @whitequark @CopperheadOS

      I see how remote attestation is useful for e.g. DRM, but not for banking.

      1 reply 0 retweets 0 likes
    9. CopperheadOS‏ @CopperheadOS 15 Jun 2017
      Replying to @whitequark

      It's to make fraud more expensive, not impossible. A cat and mouse game with attackers where they are sometimes on top is a win for them.

      2 replies 0 retweets 0 likes
    10. CopperheadOS‏ @CopperheadOS 15 Jun 2017
      Replying to @CopperheadOS @whitequark

      Also a mistake to assume that it's solely about protecting users from being hacked. They see malicious devices used for fraud as a problem.

      1 reply 0 retweets 1 like
      Rich Felker‏ @RichFelker 15 Jun 2017
      Replying to @CopperheadOS @whitequark

      It's not at all about protecting users. That's just the narrative to justify purely malicious (user-hostile) functionality.

      4:43 AM - 15 Jun 2017
      • 1 Like
      • Will Dietz
      1 reply 0 retweets 1 like
        1. New conversation
        2. CopperheadOS‏ @CopperheadOS 15 Jun 2017
          Replying to @RichFelker @whitequark

          They're barely even using that narrative. They don't seem worried about perception but rather anti-trust issues from their messaging on it.

          1 reply 0 retweets 2 likes
        3. CopperheadOS‏ @CopperheadOS 15 Jun 2017
          Replying to @CopperheadOS @RichFelker @whitequark

          Note how https://developer.android.com/training/safetynet/attestation.html … makes it out to be some kind of compatibility / anti-fragmentation feature. Standard excuse they have.

          1 reply 0 retweets 1 like
        4. CopperheadOS‏ @CopperheadOS 15 Jun 2017
          Replying to @CopperheadOS @RichFelker @whitequark

          It's not at all what it checks though. The only relation to compatibility is that they have a system for approving devices for Google Play.

          1 reply 0 retweets 0 likes
        5. CopperheadOS‏ @CopperheadOS 15 Jun 2017
          Replying to @CopperheadOS @RichFelker @whitequark

          So they are already set up to gather information about each build of every device shipping Google Play, and they could provision TZ keys.

          1 reply 0 retweets 0 likes
        6. CopperheadOS‏ @CopperheadOS 15 Jun 2017
          Replying to @CopperheadOS @RichFelker @whitequark

          Or use existing hardware-bound keys like the Qualcomm Crypto Engine hardware-bound key that's specific to TrustZone rather than the OS one.

          0 replies 0 retweets 0 likes
        7. End of conversation

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