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BRIAN_____'s profile
Brian Smith
Brian Smith
Brian Smith
@BRIAN_____

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Brian Smith

@BRIAN_____

Code farmer. Security, crypto, performance, networking, usability. Rust, C++, C, Haskell, DSLs, etc. *ring*, webpki, crypto-bench, mozilla::pkix.

Honolulu & San Francisco
briansmith.org
Joined April 2008

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    1. CopperheadOS‏ @CopperheadOS 12 Jan 2016

      CopperheadOS's OpenBSD malloc port uncovered a use-after-free in Android's fancy new over-the-air update sorcery: https://android-review.googlesource.com/#/c/196090/ .

      1 reply 50 retweets 30 likes
    2. CopperheadOS‏ @CopperheadOS 12 Jan 2016
      Replying to @CopperheadOS

      Now that the use-after-free has been fixed, CopperheadOS has been successfully moved over to doing over-the-air updates with black magic.

      1 reply 5 retweets 0 likes
    3. CopperheadOS‏ @CopperheadOS 12 Jan 2016
      Replying to @CopperheadOS

      This is required for all of the devices newer than the Nexus 5 because the cache partition is no longer large enough for a full OTA update.

      2 replies 3 retweets 0 likes
    4. Brian Smith‏ @BRIAN_____ 12 Jan 2016
      Replying to @CopperheadOS

      @CopperheadSec Do you know of a good description of how the new updater works? Is it the same as the ChromiumOS one?

      1 reply 0 retweets 0 likes
      Brian Smith‏ @BRIAN_____ 12 Jan 2016

      @CopperheadSec Also, good job!

      6:49 PM - 12 Jan 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        2. CopperheadOS‏ @CopperheadOS 12 Jan 2016
          Replying to @BRIAN_____

          @BRIAN_____ It's not really a new updater, it's just a new way of passing the zip to the recovery where it gets verified and then installed.

          1 reply 0 retweets 1 like
        3. CopperheadOS‏ @CopperheadOS 12 Jan 2016
          Replying to @CopperheadOS

          @BRIAN_____ It used to be done by downloading or copying it to /cache/recovery/, setting up /cache/recovery/command and reboot to recovery.

          1 reply 0 retweets 1 like
        4. CopperheadOS‏ @CopperheadOS 12 Jan 2016
          Replying to @CopperheadOS

          @BRIAN_____ A full over-the-air update (i.e. not an incremental one from a specific version) is very large (250-400M) as it has everything.

          1 reply 0 retweets 1 like
        5. CopperheadOS‏ @CopperheadOS 12 Jan 2016
          Replying to @CopperheadOS

          @BRIAN_____ So the cache partition has to be very large. The Nexus 5 had a 700M cache. The Nexus 6 and Nexus 9 dropped it down to 256M.

          2 replies 0 retweets 1 like
        6. CopperheadOS‏ @CopperheadOS 12 Jan 2016
          Replying to @CopperheadOS

          @BRIAN_____ The Nexus 5X only has 96M and the Nexus 6P has 100M. In terms of the update process itself, they moved to block-based OTAs.

          1 reply 0 retweets 0 likes
        7. CopperheadOS‏ @CopperheadOS 12 Jan 2016
          Replying to @CopperheadOS

          @BRIAN_____ They used to be file-based with metadata applied afterwards, but Android adopted verified boot so need fully consistent images.

          1 reply 0 retweets 0 likes
        8. CopperheadOS‏ @CopperheadOS 12 Jan 2016
          Replying to @CopperheadOS

          @BRIAN_____ All of the over-the-air updates from Google are incremental and they force you to install the updates in order. No full OTAs.

          1 reply 0 retweets 1 like
        9. CopperheadOS‏ @CopperheadOS 12 Jan 2016
          Replying to @CopperheadOS

          @BRIAN_____ CopperheadOS will probably just stick to full OTAs as the main mechanism with deltas as an optimization for n-2 and n-1 to n.

          1 reply 0 retweets 0 likes
        10. 3 more replies

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