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__agwa's profile
Andrew Ayer
Andrew Ayer
Andrew Ayer
@__agwa

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Andrew Ayer

@__agwa

Bootstrapped founder of @SSLMate, where I make SSL certificates easier and do #webpki and #CertificateTransparency stuff.

Cambridge, MA + SF Bay Area
agwa.name
Joined November 2011

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    1. Filippo Valsorda  🇮🇹‏Verified account @FiloSottile 7 May 2019
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      Oh my. Apparently, AMD CPUs will sometimes return bad results from RDRAND after a suspend. That's bad, but if everyone has been following the cryptographer's advice and _just used getrandom()_ that's not a problem. ... nope! systemd of course didn't!https://github.com/systemd/systemd/issues/11810#issuecomment-489727505 …

      16 replies 299 retweets 614 likes
      Show this thread
    2. Filippo Valsorda  🇮🇹‏Verified account @FiloSottile 7 May 2019
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      Now I'm kind of scared to go look what genuine_random_bytes does... OK, WTF, what is pseudo randomness exactly, and why on earth would you want some "genuine" randomness with a splash of "pseudo" on top. https://github.com/systemd/systemd/blob/33dbab6fde5423ce61b5544ca49afa13495477a8/src/basic/random-util.h#L15-L17 …pic.twitter.com/ceja1rEjim

      8 replies 18 retweets 125 likes
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    3. Filippo Valsorda  🇮🇹‏Verified account @FiloSottile 7 May 2019
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      Oh... oh. Pseudo-randomness is literally rand(). You know, the predictable one. Not some AES-CTR thing. Literally rand(). WHY WOULD YOU EVER WANT HALF CRYPTO AND HALF PREDICTABLE RANDOMNESS. https://github.com/systemd/systemd/blob/c55a447ab4b567d1d9f308ae11a3293ff1a7d682/src/basic/random-util.c#L229-L249 …pic.twitter.com/DPDJSEWKX5

      11 replies 50 retweets 176 likes
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    4. Filippo Valsorda  🇮🇹‏Verified account @FiloSottile 7 May 2019
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      Oh, that's why. Because the entropy bowl might be empty! The amount of damage the Linux kernel might have made by convincing everyone entropy somehow magically runs out is incalculable.pic.twitter.com/Z3Ng6xV93o

      7 replies 72 retweets 226 likes
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    5. Filippo Valsorda  🇮🇹‏Verified account @FiloSottile 7 May 2019
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      So inconsiderate for the caller to insist on good data.pic.twitter.com/EZzdL61fj2

      1 reply 5 retweets 62 likes
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    6. Filippo Valsorda  🇮🇹‏Verified account @FiloSottile 7 May 2019
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      Anyway, the reason we were in this sadness pit in the first place was to find out why they'd use straight RDRAND. And there it is. Not to waste the precious mythical entropy-that-runs-out, this legendary silver coloured fluid that leaks from pools. ENTROPY👏DOES👏NOT👏RUN👏OUTpic.twitter.com/ZtfIvXUNhQ

      9 replies 72 retweets 234 likes
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    7. Filippo Valsorda  🇮🇹‏Verified account @FiloSottile 7 May 2019
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      But Filippo, I'm sure these are all just misguided perf optimizations and that the defaults use the set of flags equivalent to getrandom()… Nah. random_bytes will use straight RDRAND, fall back on a single getrandom() call, and fill the rest with rand(). (╯°□°)╯︵ ┻━┻pic.twitter.com/UgdXgNzilq

      4 replies 10 retweets 74 likes
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    8. Filippo Valsorda  🇮🇹‏Verified account @FiloSottile 7 May 2019
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      Filippo Valsorda  🇮🇹 Retweeted Matteo Panella

      https://twitter.com/rfc1459/status/1125845963522887681 …

      Filippo Valsorda  🇮🇹 added,

      Matteo Panella @rfc1459
      Replying to @FiloSottile
      You know how systemd-resolved generates DNS TXNIDs? Right, random_bytes(): https://github.com/systemd/systemd/blob/master/src/resolve/resolved-dns-transaction.c#L154 …
      3 replies 2 retweets 39 likes
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    9. Filippo Valsorda  🇮🇹‏Verified account @FiloSottile 7 May 2019
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      Filippo Valsorda  🇮🇹 Retweeted The Register

      Bonus: apparently not even holding RDRAND right. NOT THAT IT SHOULD MATTER, because nothing general-purpose in userspace should ever touch RDRAND and instead USE getrandom() and fall back to urandom.https://twitter.com/TheRegister/status/1125842536914935813 …

      Filippo Valsorda  🇮🇹 added,

      The RegisterVerified account @TheRegister
      FWIW the underlying RDRAND bug was reported years ago and appears to affect older AMD processors, not Zen-based CPUs After a suspend, RDRAND returns -1 which stuffs up software higher up the stack https://twitter.com/FiloSottile/status/1125840275346198529 …
      Show this thread
      5 replies 9 retweets 80 likes
      Show this thread
      Andrew Ayer‏ @__agwa 7 May 2019
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      Replying to @FiloSottile

      Naturally, the comments saying systemd should just use getrandom()/urandom have been marked off-topic.

      12:59 PM - 7 May 2019
      • 8 Likes
      • Jose Rodrigues Jürgen A. Erhard Laurent Bercot trap15 • A.Marshall Royce Williams Ryan Sleevi Filippo Valsorda 🇮🇹 Ian Spence
      0 replies 0 retweets 8 likes

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