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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. Brian Smith‏ @BRIAN_____ Oct 25

      It's hard to appreciate how good Rustls is at avoiding UaF since UaF avoidance is taken for granted in idiomatic Rust code. Tiny things like `#[must_use]` are small but help avoid big failures. Our friends doing concurrency & malloc/free in C are still struggling w/ the basics.

      1 reply 4 retweets 38 likes
    2. Ted Mielczarek‏ @TedMielczarek Oct 25
      Replying to @BRIAN_____

      Trying to write C/C++ after writing Rust feels ridiculous. Why should I have to keep track of things that the compiler can do for me, especially when the consequences are exploitable security bugs?

      1 reply 1 retweet 9 likes
    3. Brian Smith‏ @BRIAN_____ Oct 25
      Replying to @TedMielczarek

      I agree. Though to be care, In C++ one rarely has to keep track of things manually, in modern codebases. Our experience maintaining a gigantic performance-sensitive legacy app that predates even the first ISO C++ (IIRC) biases us too much against C++.

      3 replies 0 retweets 3 likes
    4. Patrick Walton‏ @pcwalton Oct 25
      Replying to @BRIAN_____ @TedMielczarek

      For me the biggest annoyance is that Rust doesn’t have a wonderful solution for the most pernicious UAF in browsers: unexpected reentrancy from DOM into malicious JS. I don’t know that there *is* a good solution, really…

      5 replies 0 retweets 7 likes
    5. Brian Smith‏ @BRIAN_____ Oct 25
      Replying to @pcwalton @TedMielczarek

      I'm still a fan of the DOM-is-implemented-in-JS idea.

      1 reply 0 retweets 2 likes
    6. Patrick Walton‏ @pcwalton Oct 25
      Replying to @BRIAN_____ @TedMielczarek

      Me too, from an elegance point of view. Still, there has to be a boundary between DOM and native *somewhere*, even if only at windowing layer.

      1 reply 0 retweets 0 likes
      Brian Smith‏ @BRIAN_____ Oct 25
      Replying to @pcwalton @TedMielczarek

      I don't know quite why it's hard to find the places where we get unexpected reentrancy. I kind of imagine that most of this "unexpected" reentrancy happens many times through a few paths that are kind of stubbornly not rearchitected to avoid it. That's a pretty uninformed guess.

      1:54 PM - 25 Oct 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Andrew McCreight‏ @amccreight Oct 25
          Replying to @BRIAN_____ @pcwalton

          Mutation observers are the most common source of this problem. Remove a node from the DOM while in the middle of an operation on that node.

          2 replies 1 retweet 3 likes
        3. Dominic Cooney‏ @dominiccooney Oct 25
          Replying to @amccreight @BrendanEich and

          Mutation Events? Mutation Observers run around microtask time, which is pretty clearly defined and not reentrant.

          1 reply 0 retweets 0 likes
        4. Andrew McCreight‏ @amccreight Oct 25
          Replying to @dominiccooney @BrendanEich and

          Yeah, you are right. I always get those names mixed up for some reason.

          1 reply 0 retweets 0 likes
        5. End of conversation

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