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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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    Two-way (sending and receiving) short codes:

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    1. Slava Pestov‏ @slava_pestov 26 Sep 2017

      Twitter's new 280 character limit probably involved dozens of engineers, SREs, PMs and managers

      6 replies 5 retweets 40 likes
      Show this thread
    2. Slava Pestov‏ @slava_pestov 26 Sep 2017

      Many hours of meetings, 20 page design docs, executive reviews, nitpicking on code reviews

      3 replies 2 retweets 21 likes
      Show this thread
    3. Steve Canon‏ @stephentyrone 26 Sep 2017
      Replying to @slava_pestov

      I sure hope they parametrized everything so that their architecture is fully generic w.r.t. tweet length now.

      3 replies 0 retweets 9 likes
    4. Rich Felker‏ @RichFelker 26 Sep 2017
      Replying to @stephentyrone @slava_pestov

      There's going to be at least one buffer overflow exploit based on this.

      1 reply 5 retweets 19 likes
      Rich Felker‏ @RichFelker 26 Sep 2017
      Replying to @RichFelker @stephentyrone @slava_pestov

      struct { char text[141]; ... } tweet_t;

      5:59 PM - 26 Sep 2017
      • 1 Retweet
      • 5 Likes
      • some person Ted Sohns Cody☕️🦀 Steve Canon Slava Pestov brx0 🍂🎃🥧
      2 replies 1 retweet 5 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker 26 Sep 2017
          Replying to @RichFelker @stephentyrone @slava_pestov

          FWIW the above was _already_ an overflow. Tweet limit is not in char[] but (Unicode) characters, thus up to 560 bytes + NUL.

          1 reply 0 retweets 5 likes
        3. Rich Felker‏ @RichFelker 26 Sep 2017
          Replying to @RichFelker @stephentyrone @slava_pestov

          And twice that with the new limit, of course, so 1120 bytes + NUL.

          1 reply 0 retweets 1 like
        4. Cody ☕️ 🦀‏ @valarauca1 26 Sep 2017
          Replying to @RichFelker @stephentyrone @slava_pestov

          With bad baggy bounds that may end up being a fully page in some allocators

          1 reply 0 retweets 0 likes
        5. Steve Canon‏ @stephentyrone 27 Sep 2017
          Replying to @valarauca1 @RichFelker @slava_pestov

          Page align your tweets for best performance. -falign-tweets=4096 -funroll-loops --teach-me-unix

          0 replies 0 retweets 5 likes
        6. End of conversation
        1. New conversation
        2. Cody ☕️ 🦀‏ @valarauca1 26 Sep 2017
          Replying to @RichFelker @stephentyrone @slava_pestov

          unit32_t they allow Unicode so 4byte code points. so ~564 chars max buffer len in old code.

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker 26 Sep 2017
          Replying to @valarauca1 @stephentyrone @slava_pestov

          Yep. Actually 561 with NUL termination - the content can be arbitrary Unicode up to 4 bytes in UTF-8, but NUL is just 1 byte.

          0 replies 0 retweets 4 likes
        4. End of conversation

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