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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. 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
    2. 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
    3. 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
    4. 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
    5. 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
    6. 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
    7. 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
    8. whitequark‏ @whitequark 15 Jun 2017
      Replying to @CopperheadOS

      so remote attestation here is used as just another mitigation, gotcha. seems to ultimately do more harm to users but I see why they'd do it

      2 replies 0 retweets 0 likes
    9. Rich Felker‏ @RichFelker 15 Jun 2017
      Replying to @whitequark @CopperheadOS

      It makes sense why bad app vendors want it. Not why Google chooses to pander to malicious apps & throw their users under bus.

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

      App vendors were already rolling their own garbage like this, and they were fighting against locking down the app sandbox.

      2 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker 15 Jun 2017
      Replying to @CopperheadOS @whitequark

      Yeah but platform could just shut down their channels & ban them from Play too.

      4:48 AM - 15 Jun 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. CopperheadOS‏ @CopperheadOS 15 Jun 2017
          Replying to @RichFelker @whitequark

          They aren't going to fight against those vendors, particularly since Google in many cases has the same kinds of interests as those vendors.

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

          They get a 30% cut from Play Store revenue. They don't want piracy, and they definitely don't want ad fraud breaking their ad revenue.

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

          They sell media like movies with DRM, and they cut a cut of from Netflix via Android billing API along with a bunch of similar services.

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

          Google bought Widevine, and WV on Android already has a TrustZone app. SafetyNet can become much more sophisticated, general purpose DRM.

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

          Need to remember that the goal isn't protecting users and it doesn't need to provide great security to crush piracy, ad fraud and so on.

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

          So lets say that only a subset of Android devices end up with a good implementation of this. Okay, make ad views on those cost more money.

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

          Only make 4k video available to those devices, etc.

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

          Once they have their remote attestation foothold, they can deploy stuff like sophisticated local anti-fraud machine learning tech.

          1 reply 0 retweets 0 likes
        10. 11 more replies

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