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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 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
    2. 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
    3. 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
    4. Rich Felker‏ @RichFelker 3 Jun 2016
      Replying to @RichFelker @ch3root @solardiz

      But C also reqs an obj of size n*m be produced, or calloc fail. Since the former is not possible, latter is mandatory.

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

      Why the former is not possible?

      1 reply 0 retweets 0 likes
    6. friend void‏ @volatile_void 3 Jun 2016
      Replying to @ch3root

      because of the definitions of size_t and of SIZE_MAX

      2 replies 0 retweets 0 likes
    7. Jens Gustedt‏ @gustedt 3 Jun 2016
      Replying to @volatile_void @ch3root

      @RichFelker, I don't think you can deduce that the allocation is not possible. So calloc is free to fail or not.

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

      C std does a very poor job of making reqs like this 100% clear, but size_t needs to be able to repr any obj size

      2 replies 0 retweets 1 like
    9. Rich Felker‏ @RichFelker 3 Jun 2016
      Replying to @RichFelker @gustedt @ch3root

      7.19¶4 suggests that "supporting large objects" would make it "necessary" for size_t to be a larger type.

      1 reply 0 retweets 1 like
    10. Jens Gustedt‏ @gustedt 3 Jun 2016
      Replying to @RichFelker @ch3root

      This all what they put under "quality of the implementation", so this is not mandatory.

      1 reply 0 retweets 1 like
      Rich Felker‏ @RichFelker 3 Jun 2016
      Replying to @gustedt @ch3root

      We should always keep in mind that a "valid" but "low-quality" impl. is free to only compile one fixed program.

      12:05 PM - 3 Jun 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Jens Gustedt‏ @gustedt 3 Jun 2016
          Replying to @RichFelker @ch3root

          That doesn't catch it, I think. Oldish segmented platforms could have 16 bit size_t and larger dynamic allocs

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

          No, if your seg'd arch has 16-bit size_t, you can't have individual allocations >64k, just larger total mem.

          2 replies 0 retweets 0 likes
        4. Jens Gustedt‏ @gustedt 3 Jun 2016
          Replying to @RichFelker @ch3root

          I don't see where this would be required. size_t is defined via sizeof.

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

          Specification of lib functions. E.g. strlen is specified to return length, not "length, converted to size_t".

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

          If you want to just say it's UB or unspecified result if it doesn't fit, that's even more awful and unusable.

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

          Sure it's UB. In the same way as printf of >INT_MAX chars.

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

          Only way you can claim it's UB is by omission of a clear statement what happens. In any case, unusably bad impl.

          1 reply 0 retweets 1 like
        9. Rich Felker‏ @RichFelker 3 Jun 2016
          Replying to @RichFelker @ch3root @gustedt

          This is very different from printf >INT_MAX, since there's no conceptual upper bound on printf output length.

          2 replies 0 retweets 0 likes
        10. 5 more replies

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