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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 6 Oct 2015

      “POSIX defines a thread-safe alternative gmtime_r, which is similar to the C11 function gmtime_s, except that …” ╯‵Д′)╯彡┻━┻

      1 reply 0 retweets 1 like
    2. Brian Mastenbrook‏ @bmastenbrook 6 Oct 2015
      Replying to @volatile_void

      @spun_off you inspired me to throw KLEE at musl's gmtime_r, and besides crashing KLEE, I've got an out-of-bounds access (cc @RichFelker)

      5 replies 2 retweets 2 likes
    3. Rich Felker‏ @RichFelker 6 Oct 2015
      Replying to @bmastenbrook

      @bmastenbrook @spun_off Not seeing many memory accesses in it. So far just *t and *tm in gmtime_r.c, *tm and months[] in __secs_to_tm.c...?

      2 replies 0 retweets 0 likes
    4. Brian Mastenbrook‏ @bmastenbrook 6 Oct 2015
      Replying to @RichFelker

      @richfelker @spun_off it's complaining about days_in_month, but the counterexample it produces doesn't do what it claims. I'm blaming KLEE.

      1 reply 0 retweets 0 likes
    5. Brian Mastenbrook‏ @bmastenbrook 6 Oct 2015
      Replying to @bmastenbrook

      @richfelker @spun_off but! I've got some nice signed overflows for you

      2 replies 0 retweets 1 like
    6. Rich Felker‏ @RichFelker 6 Oct 2015
      Replying to @bmastenbrook

      @bmastenbrook @spun_off Interested in seeing them. This is supposed to make them impossible: http://git.musl-libc.org/cgit/musl/tree/src/time/__secs_to_tm.c?id=1cc81f5cb0df2b66a795ff0c26d7bbc4d16e13c6#n21 …

      2 replies 0 retweets 0 likes
    7. friend void‏ @volatile_void 6 Oct 2015
      Replying to @RichFelker

      @RichFelker How about this line (“years + 100” has type int)? http://git.musl-libc.org/cgit/musl/tree/src/time/__secs_to_tm.c?id=1cc81f5cb0df2b66a795ff0c26d7bbc4d16e13c6#n63 …

      1 reply 0 retweets 0 likes
    8. Rich Felker‏ @RichFelker 6 Oct 2015
      Replying to @volatile_void

      @spun_off Hmm, indeed. Looks like that code was adapted from a draft where years had type larger than int.

      1 reply 0 retweets 2 likes
      Rich Felker‏ @RichFelker 6 Oct 2015

      @spun_off Line 58 that computes years also seems to be using wrong types.

      4:31 PM - 6 Oct 2015
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Brian Mastenbrook‏ @bmastenbrook 6 Oct 2015
          Replying to @RichFelker

          @richfelker @spun_off yup, those are the two errors

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker 8 Oct 2015
          Replying to @bmastenbrook

          @bmastenbrook @spun_off Does nsz's proposed fix (changing years to long long, 400 to 400LL) look ok to you?

          1 reply 0 retweets 0 likes
        4. friend void‏ @volatile_void 8 Oct 2015
          Replying to @RichFelker

          @RichFelker It seems alright to me. May I tempt you with a binary you could run day or night that would provide even greater confidence?

          1 reply 0 retweets 0 likes
        5. friend void‏ @volatile_void 8 Oct 2015
          Replying to @volatile_void

          @RichFelker I understand there is some binary compatibility but linking against Musl would also be possible.pic.twitter.com/EYnn8BbPlK

          0 replies 0 retweets 0 likes
        6. End of conversation

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