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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. Solar Designer‏ @solardiz 3 Jun 2016
      Replying to @ch3root

      What libc? Looks like there's still/again an integer overflow in calloc(), or am I reading this wrong?

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

      A highly invalid "optimization" by clang. That compiler needs -fno-builtin to be usable.

      2 replies 1 retweet 3 likes
    3. Alexander Cherepanov‏ @ch3root 3 Jun 2016
      Replying to @RichFelker @solardiz

      Why don't you like this optimization?

      1 reply 0 retweets 0 likes
    4. 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
    5. 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
    6. 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
    7. 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
    8. 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
    9. 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
    10. Alexander Cherepanov‏ @ch3root 3 Jun 2016
      Replying to @RichFelker @solardiz

      The - operator is only not safe in C for arrays of chars larger than PTRDIFF_MAX.

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

      But code accepting 2 ptrs into same array can't assume or even test that diff won't overflow; in practice - is unusable.

      11:32 AM - 3 Jun 2016
      • 1 Like
      • Greg Jandl
      1 reply 0 retweets 1 like
        1. New conversation
        2. Alexander Cherepanov‏ @ch3root 3 Jun 2016
          Replying to @RichFelker @solardiz

          Oh 1) Only for char array. 2) Can be checked via (uintptr_t).

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

          3) Only a problem for generic libraries, self contained app can be sure not to create so large char arrays.

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

          4) - can be defined so that it gives right result after a cast to uintptr_t (heh, that's your idea:-)

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

          5) As we have seen with glibc's FILE and gconv interface passing end pointers is not a general solution.

          0 replies 0 retweets 0 likes
        6. End of conversation

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