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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. whitequark‏ @whitequark 13 Mar 2017

      pic.twitter.com/HNAlM2z9K0

      3 replies 10 retweets 41 likes
      Rich Felker‏ @RichFelker 13 Mar 2017
      Replying to @whitequark

      Nope. -fno-plt https://ewontfix.com/18/  @ewontfix :-)

      12:03 PM - 13 Mar 2017
      • 9 Likes
      • ██████████████████████████████████████████████████ Alexander Tarasikov Jed Davis 🏳️‍🌈 Finite Nate Machine micah elizabeth scott | @scanlime@kitty.town Jonas Schievink mork 👽 Leandro Pereira George Brown
      1 reply 0 retweets 9 likes
        1. New conversation
        2. Brendan G Bohannon‏ @cr88192 13 Mar 2017
          Replying to @RichFelker @whitequark @ewontfix

          these issues could be addressed either via explicit imports/exports or by trampolining calls in the linker

          1 reply 0 retweets 0 likes
        3. Brendan G Bohannon‏ @cr88192 13 Mar 2017
          Replying to @cr88192 @RichFelker and

          explicit=needs annotations (ex: Win32); trampoline=pay more for non-local calls but cheaper local calls.

          1 reply 0 retweets 0 likes
        4. Rich Felker‏ @RichFelker 13 Mar 2017
          Replying to @cr88192 @whitequark @ewontfix

          Explicit import/export isn't C. PLT "trampoline" ABI on x86 is exactly the problem the linked article covers.

          1 reply 0 retweets 0 likes
        5. Brendan G Bohannon‏ @cr88192 13 Mar 2017
          Replying to @RichFelker @whitequark @ewontfix

          Win32 does explicit import/export in C via __declspec, granted, not a good option for Linux/... codebases

          1 reply 0 retweets 0 likes
        6. Brendan G Bohannon‏ @cr88192 13 Mar 2017
          Replying to @cr88192 @RichFelker and

          PLT calls generate stuff inline in the function; trampoline would generate it at externally at link time.

          2 replies 0 retweets 0 likes
        7. Rich Felker‏ @RichFelker 14 Mar 2017
          Replying to @cr88192

          You're mistaken here. At call point, call through PLT looks normal. That's the whole point.

          1 reply 0 retweets 0 likes
        8. Rich Felker‏ @RichFelker 14 Mar 2017
          Replying to @RichFelker @cr88192

          No extra code is generated for thr call itself, but some archs (x86) require GOT reg to be valid for external calls.

          1 reply 0 retweets 0 likes
        9. Brendan G Bohannon‏ @cr88192 14 Mar 2017
          Replying to @RichFelker

          ok. this would make the PLT more directly analogous to the IAT then (ex: a stub used typically only on external calls)?...

          1 reply 0 retweets 0 likes
        10. 8 more replies

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