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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. @landley‏ @landley 2 Jun 2015

      Hard linux container problem: what do you do about /dev/random? How do you control access to a finite shared resource (entropy bits)?

      2 replies 0 retweets 0 likes
    2.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 2 Jun 2015
      Replying to @landley

      @landley you alias it to /dev/urandom because running entropy estimation is absolutely stupid

      1 reply 0 retweets 0 likes
    3. @landley‏ @landley 2 Jun 2015
      Replying to @erincandescent

      @oshepherd You don't use urandom for long-lived keys.

      1 reply 0 retweets 0 likes
    4.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 2 Jun 2015
      Replying to @landley

      @landley they both return the same date except one blocks for no good reason. You can't exhaust entropy, it is not destroyed

      1 reply 1 retweet 1 like
    5. Rich Felker‏ @RichFelker 2 Jun 2015
      Replying to @erincandescent

      @oshepherd @landley Using urandom (or equiv getrandom() syscall) is actually the correct behavior for everything, including long-lived keys.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 2 Jun 2015

      @oshepherd @landley /dev/random and the hassle GPG makes you go through to gather entropy are pure cargo-cult nonsense.

      10:29 AM - 2 Jun 2015
      1 reply 0 retweets 0 likes
        1. New conversation
        2.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 2 Jun 2015
          Replying to @RichFelker

          @RichFelker @landley The one case where urandom can fail and random can't is when the system hasn't collected any entropy yet...

          1 reply 0 retweets 0 likes
        3.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 2 Jun 2015
          Replying to @erincandescent

          @RichFelker @landley but it should be regarded as a long standing Linux bug that the system will hand out random numbers in this case

          1 reply 0 retweets 0 likes
        4. Rich Felker‏ @RichFelker 2 Jun 2015
          Replying to @erincandescent

          @oshepherd @landley Yes. It's entirely fixable though just by saving entropy in nonvolatile storage and reloading it during early boot.

          0 replies 0 retweets 0 likes
        5. End of conversation

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