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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.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 22 Dec 2017
      Replying to @RichFelker @pcwalton

      You can feed a csPRNG with as few bits as you right. It won't be secure if you seed it but this has no impact on unseeded use (or seeding with a wider seed)

      1 reply 0 retweets 1 like
    2. Rich Felker‏ @RichFelker 22 Dec 2017
      Replying to @erincandescent @pcwalton

      In best-known example (C), the only seeding API takes unsigned int (basically always 32-bit or less) and if it's not called the default seed of 1 is mandated.

      2 replies 0 retweets 1 like
    3. Rich Felker‏ @RichFelker 22 Dec 2017
      Replying to @RichFelker @erincandescent @pcwalton

      Using an algorithm that otherwise would yield a csPRNG would just waste time and give users a misleading expectation of cryptographic properties.

      1 reply 0 retweets 0 likes
    4. Marc Espie‏ @espie_openbsd 22 Dec 2017
      Replying to @RichFelker @erincandescent @pcwalton

      actually OpenBSD deviated from the standard a few years ago and yields a fairly robust random generator by default. Why ? because people are idiots, so they will use rand() for... whatever, and hash-based random generators are fairly fast and secure anyway.

      1 reply 0 retweets 1 like
    5. Rich Felker‏ @RichFelker 22 Dec 2017
      Replying to @espie_openbsd @erincandescent @pcwalton

      Yes, I'm aware of this. It's utterly wrong and unjustifiable. Auditing for programs misusing rand() is trivial to automate without breaking valid programs.

      1 reply 0 retweets 0 likes
    6. Marc Espie‏ @espie_openbsd 23 Dec 2017
      Replying to @RichFelker @erincandescent @pcwalton

      where's your automation ? still waiting for it. how come there are still, literally THOUSANDS of opensource software out there with lots of trivial security holes that nobody is fixing ? I, for one, am EAGERLY awaiting your work to fix that.

      2 replies 0 retweets 1 like
    7. Rich Felker‏ @RichFelker 23 Dec 2017
      Replying to @espie_openbsd @erincandescent @pcwalton

      readelf | grep rand. There are NOT thousands of FOSS projects using rand where they need a csPRNG.

      1 reply 0 retweets 0 likes
    8. Marc Espie‏ @espie_openbsd 23 Dec 2017
      Replying to @RichFelker @erincandescent @pcwalton

      right. you have all opensource programs compiled and greppable on your machine. I did not say THOUSANDS of FOSS using rand. I said THOUSANDS of trivial security holes. Not all of them are related to rand. I'm talking about scaling. Any individual check is basically trivial.

      1 reply 0 retweets 0 likes
    9. Marc Espie‏ @espie_openbsd 23 Dec 2017
      Replying to @espie_openbsd @RichFelker and

      ... but still, there are THOUSANDS of opensource projects that fail those basic security checks. Explain that away, if it's such a simple problem to solve. At least, we are taking steps. Yep, even when it flies in the face of ISO, which is frankly, not that helpful.

      2 replies 0 retweets 0 likes
    10. Marc Espie‏ @espie_openbsd 23 Dec 2017
      Replying to @espie_openbsd @RichFelker and

      for instance, how much time did it take ISO to *finally* deprecate gets ? How come there still ISN'T any flag in fopen to give us some modicum of control on creating/overwriting files ? At least POSIX reacts, sometimes and they finally took mktemp out, for instance.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 23 Dec 2017
      Replying to @espie_openbsd @erincandescent @pcwalton

      Again breaking valid programs. Now you have to roll your own mktemp for non-regular-files (e.g. fifos).

      7:19 AM - 23 Dec 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Marc Espie‏ @espie_openbsd 23 Dec 2017
          Replying to @RichFelker @erincandescent @pcwalton

          you're still talking 1% valid use vs 99% bugs. Usage of mktemp for non-file paths is best left to creating stuff in a separate directory after mkdtemp, btw. This works just fine and is reasonably idiot-proof.

          1 reply 0 retweets 1 like
        3. Rich Felker‏ @RichFelker 23 Dec 2017
          Replying to @espie_openbsd @erincandescent @pcwalton

          Yes, in many cases that's a better solution.

          0 replies 0 retweets 0 likes
        4. End of conversation

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