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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. Rich Felker‏ @RichFelker 10 Sep 2017
      Replying to @sortiecat

      Why not just write *a=*b if the point isn't to avoid type constraints?

      1 reply 0 retweets 0 likes
    2. Brendan G Bohannon‏ @cr88192 10 Sep 2017
      Replying to @RichFelker @sortiecat

      for copying structs, for most compilers, this seems like a "more likely correct" solution (ex: if memcpy is handled poorly, ...).

      1 reply 0 retweets 1 like
    3. Jonas Termansen‏ @sortiecat 10 Sep 2017
      Replying to @cr88192 @RichFelker

      Yes, exactly. Unfortunately C doesn't have struct assignment by value, which is a shame. Feels like a C-y operation to me and not C++-like.

      1 reply 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker 10 Sep 2017
      Replying to @sortiecat @cr88192

      Huh? Of course C has struct assignment by value.

      1 reply 0 retweets 1 like
    5. Jonas Termansen‏ @sortiecat 10 Sep 2017
      Replying to @RichFelker @cr88192

      Huh. You're right. Not sure where I got this impression from. Yay. Though C doesn't have struct == so my memcmp concerns still exist.

      2 replies 0 retweets 1 like
    6. Rich Felker‏ @RichFelker 10 Sep 2017
      Replying to @sortiecat @cr88192

      Yes. But memcmp for structs is often wrong unless you know they have no padding, & no members that need comparison more nuanced than memcmp.

      1 reply 0 retweets 1 like
    7. Jonas Termansen‏ @sortiecat 10 Sep 2017
      Replying to @RichFelker @cr88192

      I continue to be terrified of bugs relating to uninitialized padding and struct uninitialized padding copied between security boundaries

      1 reply 1 retweet 2 likes
    8. Rich Felker‏ @RichFelker 10 Sep 2017
      Replying to @sortiecat @cr88192

      This is a strong argument for not copying structs at all but just assigning individual members.

      1 reply 0 retweets 2 likes
    9. Jonas Termansen‏ @sortiecat 10 Sep 2017
      Replying to @RichFelker @cr88192

      struct foo a = b; struct foo a = { 0 }; a.baz = b.baz; a.qux = b.qux; Much more boilerplate. :/

      2 replies 0 retweets 1 like
    10. Rich Felker‏ @RichFelker 10 Sep 2017
      Replying to @sortiecat @cr88192

      Yes but it forces you to consciously marshal across priv domains rather than treating them as having shared/shareable data structs.

      1 reply 0 retweets 2 likes
      Rich Felker‏ @RichFelker 10 Sep 2017
      Replying to @RichFelker @sortiecat @cr88192

      Also helps avoid creating ABI dependency on internal representations of one side.

      8:42 AM - 10 Sep 2017
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Jonas Termansen‏ @sortiecat 10 Sep 2017
          Replying to @RichFelker @cr88192

          Makes a lot of sense for sockets or IPC. Not so much in the kernel syscall case where you want the same struct ABI on both sides.

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker 10 Sep 2017
          Replying to @sortiecat @cr88192

          That's a place where you do until you don't. Think of 32-bit binaries on 64-bit kernel.

          1 reply 0 retweets 1 like
        4. Rich Felker‏ @RichFelker 10 Sep 2017
          Replying to @RichFelker @sortiecat @cr88192

          Abstracting the marshalling to begin with would have greatly reduced the overall coding effort.

          1 reply 0 retweets 0 likes
        5. Jonas Termansen‏ @sortiecat 10 Sep 2017
          Replying to @RichFelker @cr88192

          You make a valid point. Though Sortix doesn't have 32-bit on 64-bit on purpose (partially for this reason), keeps things a lot simpler.

          1 reply 0 retweets 0 likes
        6. 2 more replies
        1. Rich Felker‏ @RichFelker 10 Sep 2017
          Replying to @RichFelker @sortiecat @cr88192

          Rather than writing the "boilerplate" code you can use tables to represent the layout & generic code to do the marshalling using them.

          0 replies 0 retweets 0 likes
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