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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. rcombs, now 100% asbestos-free‏ @11rcombs May 29

      fun facts: - glib has, for some reason, a library constructor - which creates thread-local storage - which is configured with a destructor pointer within libglib - the library destructor does not destroy said storage - some libs you may want to dlopen()/dlclose() may link glib

      1 reply 17 retweets 31 likes
      Show this thread
    2. rcombs, now 100% asbestos-free‏ @11rcombs May 29

      so, if you dlopen() something that links against glib, dlclose() it, and then exit the thread you dlopen()'d on, your pthreads implementation will attempt to jump into wherever glib used to be mapped before you dlclose()d it and your program will, if you're lucky, segfault

      1 reply 3 retweets 12 likes
      Show this thread
    3. rcombs, now 100% asbestos-free‏ @11rcombs May 29

      "your program will, if you're lucky, segfault" is not a clause you want used to describe a scenario you find yourself in

      2 replies 11 retweets 30 likes
      Show this thread
    4. rcombs, now 100% asbestos-free‏ @11rcombs May 29

      this is the part where the musl devs go "I told you so" about using dlclose() and act smug about how their implementation is a no-op

      2 replies 2 retweets 22 likes
      Show this thread
    5. Rich Felker‏ @RichFelker May 29
      Replying to @11rcombs

      I told you so.

      1 reply 1 retweet 4 likes
    6. __vlqc‏ @__vlqc May 29
      Replying to @RichFelker @11rcombs

      do yall implement thread-local-storage destructors as noops too?

      1 reply 0 retweets 0 likes
    7. Rich Felker‏ @RichFelker May 29
      Replying to @__vlqc @11rcombs

      No. There are at least 2 types of TLS dtor. Keyed ones have dtor semantics specified by POSIX and C11. C++ ones are implemented by gcc on top of the former.

      1 reply 0 retweets 1 like
      Rich Felker‏ @RichFelker May 29
      Replying to @RichFelker @__vlqc @11rcombs

      Arguably libc should provide a higher-quality C++ TLS implementation, but due to a design flaw in the ABI, it's impossible to do robustly without 800% memory overhead.

      9:40 AM - 29 May 2018
      • 1 Like
      • __vlqc
      1 reply 0 retweets 1 like
        1. Rich Felker‏ @RichFelker May 29
          Replying to @RichFelker @__vlqc @11rcombs

          So since we can't actually make it better than what gcc already emulates without ridiculous overhead, for now we just let gcc be the one to do it [wrongly].

          0 replies 0 retweets 1 like
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