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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. friend void‏ @volatile_void 19 Mar 2016
      Replying to @RichFelker

      @RichFelker Well that little dance that musl does to set f.rend in src/stdlib/strtol.c is only a different kind of UB.

      2 replies 0 retweets 0 likes
    2. Rich Felker‏ @RichFelker 19 Mar 2016
      Replying to @volatile_void

      @spun_off Yes, it should be done with uintptr_t, but really index/count, not pos/end, should be used.

      2 replies 0 retweets 1 like
    3. friend void‏ @volatile_void 22 Mar 2016
      Replying to @RichFelker

      @RichFelker Having discussed the above I don't suppose it interests you that musl also does this? https://goo.gl/GW7kn9 

      2 replies 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker 22 Mar 2016
      Replying to @volatile_void

      @spun_off musl compares null and non-null ptrs with <? Where?

      1 reply 0 retweets 0 likes
    5. friend void‏ @volatile_void 22 Mar 2016
      Replying to @RichFelker

      @RichFelker Here—line 6: http://git.musl-libc.org/cgit/musl/tree/src/stdio/__toread.c#n6 … as reached from wcstoll().

      2 replies 0 retweets 0 likes
    6. Rich Felker‏ @RichFelker 28 Mar 2016
      Replying to @volatile_void

      @spun_off Fixed by http://git.musl-libc.org/cgit/musl/commit/?id=6d1a3dfeaf2caac4033a3c65822fb4e7e14866c7 …

      1 reply 0 retweets 2 likes
    7. Alexander Cherepanov‏ @ch3root 29 Mar 2016
      Replying to @RichFelker

      @RichFelker @spun_off Judging by commit message, "NULL > ptr" is replaced by "NULL > NULL" which is still UB, right?

      1 reply 0 retweets 0 likes
    8. Rich Felker‏ @RichFelker 29 Mar 2016
      Replying to @ch3root

      @ch3root @spun_off I assumed relational operators were well-defined with both operands null, but maybe they're not?

      1 reply 0 retweets 0 likes
    9. Rich Felker‏ @RichFelker 29 Mar 2016
      Replying to @RichFelker

      @ch3root @spun_off It looks like subtraction of null pointers from each other might also be gratuitously undefined. :-(

      1 reply 0 retweets 0 likes
    10. Rich Felker‏ @RichFelker 29 Mar 2016
      Replying to @RichFelker

      @ch3root @spun_off Together these leave a lot of real-world programs wit "gratuitous UB" that's hard to fix.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 29 Mar 2016

      @ch3root @spun_off You would expect (a||b)?a-b:0 or a==b?0:a-b to yield "a-b without UB" but gcc & llvm fail to collapse the branch. :-(

      1:26 PM - 29 Mar 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Alexander Cherepanov‏ @ch3root 4 Apr 2016
          Replying to @RichFelker

          @RichFelker @spun_off FTR I think "NULL > NULL" is better than "NULL > ptr", even if still UB.

          1 reply 0 retweets 0 likes
        3. Alexander Cherepanov‏ @ch3root 4 Apr 2016
          Replying to @ch3root

          @RichFelker @spun_off There is an easy fix for all such UB -- casts to uintptr_t: (uintptr_t)a > (uintptr_t)b etc. Not very elegant though.

          1 reply 0 retweets 1 like
        4. friend void‏ @volatile_void 4 Apr 2016
          Replying to @ch3root

          @ch3root I had forgotten about (uintptr_t). It does seem to me less worse than any other alternative.

          1 reply 0 retweets 0 likes
        5. friend void‏ @volatile_void 4 Apr 2016
          Replying to @volatile_void

          @ch3root I have already written a tis-interpreter option to accept (uintptr_t)p<(uintptr_t)q in memmove. I pledge allegiance to uintptr_t!

          0 replies 0 retweets 2 likes
        6. End of conversation

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