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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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    Brian Smith‏ @BRIAN_____ Jan 8

    Brian Smith Retweeted Kenn White

    I highly recommend the "Branchless Security Checks" section.https://twitter.com/kennwhite/status/950547645453434881 …

    Brian Smith added,

    Kenn WhiteVerified account @kennwhite
    “Spectre is not just an attack on JavaScriptCore itself but also everything that is callable from JS.” WebKit takes similar mitigations as FF & IE and will add branchless security checks. https://webkit.org/blog/8048/what-spectre-and-meltdown-mean-for-webkit/ …
    Show this thread
    7:36 PM - 8 Jan 2018
    • 5 Retweets
    • 14 Likes
    • InsanityBit garrett Brad Hill Jonas Hermsmeier Geoffrey Sneddon 🏳️‍🌈 black Thom Chiovoloni Rorohiko Kore Tony Arcieri
    2 replies 5 retweets 14 likes
      1. New conversation
      2. Alexis Beingessner‏ @Gankro Jan 8
        Replying to @BRIAN_____

        I literally don’t understand how the index masking is semantics preserving?

        2 replies 0 retweets 0 likes
      3. JF Bastien‏ @jfbastien Jan 8
        Replying to @Gankro @BRIAN_____

        The mask is nextPowerOf2(length) - 1. That’s always a no-op in normal execution, and only masks when out of bounds, which only occurs in speculative execution because there’s always a size check branch before the access.

        0 replies 0 retweets 3 likes
      4. End of conversation
      1. Benjamin Fry  🐞 🔫 🦀= ⚙️‏ @benj_fry Jan 9
        Replying to @BRIAN_____

        Rusts monomorphism lends itself really well to some traditional branch locations. Anywhere there’s a static boolean. Maybe we should make boolean generics a language supported feature?

        0 replies 0 retweets 0 likes
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