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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. Alexander Cherepanov‏ @ch3root 3 Jun 2016
      Replying to @RichFelker @solardiz

      Why don't you like this optimization?

      1 reply 0 retweets 0 likes
    2. Rich Felker‏ @RichFelker 3 Jun 2016
      Replying to @ch3root @solardiz

      Because it violates the as-if rule. The calloc call is required to fail; transformation makes it succeed.

      1 reply 0 retweets 1 like
    3. Alexander Cherepanov‏ @ch3root 3 Jun 2016
      Replying to @RichFelker @solardiz

      What requires this calloc call to fail? C11? POSIX? For all sizes > PTRDIFF_MAX? Or > SIZE_MAX?

      2 replies 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker 3 Jun 2016
      Replying to @ch3root @solardiz

      Multiple things. The most important is the compiler's inability to handle objects > PTRDIFF_MAX in a consistent manner.

      2 replies 0 retweets 0 likes
    5. Alexander Cherepanov‏ @ch3root 3 Jun 2016
      Replying to @RichFelker @solardiz

      I consider this a bug in compilers. Which would be nice to fix. This is not a requirement of some standard.

      2 replies 0 retweets 0 likes
    6. Rich Felker‏ @RichFelker 3 Jun 2016
      Replying to @ch3root @solardiz

      Supporting objects >PTRDIFF_MAX rather than ensuring they don't exist is a QoI bug even if not a conformance issue.

      1 reply 0 retweets 0 likes
    7. Rich Felker‏ @RichFelker 3 Jun 2016
      Replying to @RichFelker @ch3root @solardiz

      The - operator is not safe to use on pointers unless the implementation precludes objects > PTRDIFF_MAX.

      2 replies 0 retweets 0 likes
    8. Rich Felker‏ @RichFelker 3 Jun 2016
      Replying to @RichFelker @ch3root @solardiz

      So I agree there's a bug that needs to be fixed, but the proper fix is ensuring the offending objects can never arise.

      1 reply 0 retweets 0 likes
    9. Alexander Cherepanov‏ @ch3root 3 Jun 2016
      Replying to @RichFelker @solardiz

      So all objects in all programs are to be restricted to <=PTRDIFF_MAX due to a potential problem of the - operator\

      1 reply 0 retweets 0 likes
    10. Alexander Cherepanov‏ @ch3root 3 Jun 2016
      Replying to @ch3root @RichFelker @solardiz

      with large arrays of chars in some programs. Doesn't look like a proper fix to me.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 3 Jun 2016
      Replying to @ch3root @solardiz

      Not "some programs". Due to complete inability to use an operator that's widely used and should be usable.

      11:36 AM - 3 Jun 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker 3 Jun 2016
          Replying to @RichFelker @ch3root @solardiz

          "This operator works, but it could overflow & yield UB, & you have no way of testing it does" = bug in C standard.

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker 3 Jun 2016
          Replying to @RichFelker @ch3root @solardiz

          Any non-crap implementation of C will avoid this bug simply by not generating cases that can overflow.

          0 replies 0 retweets 0 likes
        4. End of conversation

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