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jedisct1's profile
Frank
Frank
Frank
@jedisct1

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Frank

@jedisct1

France
Joined November 2008

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    1. JP Aumasson‏ @veorq 29 May 2017
      • Report Tweet
      • Report NetzDG Violation

      JP Aumasson Retweeted CopperheadOS

      systemd uses getrandom() unless it blocks, in which case it just reads /dev/urandom, missing the point of getrandom()https://twitter.com/CopperheadOS/status/869162762370506754 …

      JP Aumasson added,

      CopperheadOS @CopperheadOS
      Replying to @CopperheadOS @veorq @cryptopathe
      https://github.com/systemd/systemd/blob/56744c037da0ba2032fba0c7ac116317bb5ae4ae/src/basic/random-util.c#L51 … is similar to what Python was doing.
      4 replies 18 retweets 22 likes
    2. Jesper L. Andersen‏ @jlouis666 29 May 2017
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      Replying to @veorq @jedisct1

      I have a hunch some of this is workaround for slow process of adoption of sane interfaces. Linux is a supertanker w.r.t moving.

      1 reply 0 retweets 0 likes
    3. Jesper L. Andersen‏ @jlouis666 29 May 2017
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      Replying to @jlouis666 @veorq @jedisct1

      In e.g., *BSD or Illumos-gate you just make the change on next major release and you are done.

      1 reply 0 retweets 0 likes
    4. CopperheadOS‏ @CopperheadOS 29 May 2017
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      Replying to @jlouis666 @veorq @jedisct1

      They are deliberately bypassing the blocking until initialization. This is when the API is present, and systemd mandates new kernels anyway.

      1 reply 0 retweets 0 likes
    5. CopperheadOS‏ @CopperheadOS 29 May 2017
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      Replying to @CopperheadOS @jlouis666 and

      It only blocks when the CSPRNG cannot be considered initialized because not enough initial entropy was available yet. It's abuse of the API.

      1 reply 0 retweets 0 likes
    6. CopperheadOS‏ @CopperheadOS 29 May 2017
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      Replying to @CopperheadOS @jlouis666 and

      Note that getrandom doesn't provide a way to bypass the initialization check. It's reporting an EAGAIN error and then they just use urandom.

      1 reply 0 retweets 0 likes
    7. Jesper L. Andersen‏ @jlouis666 29 May 2017
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      Replying to @CopperheadOS @veorq @jedisct1

      I wonder how long it takes for the entropy pool to get up and initialized. My guess would be in the millisecond range.

      1 reply 0 retweets 0 likes
    8. Frank‏ @jedisct1 29 May 2017
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      Replying to @jlouis666 @CopperheadOS @veorq

      Not really. On VMs (often reported on Digital Ocean & Scaleway), it can take *minutes*.

      2 replies 0 retweets 0 likes
    9. Jesper L. Andersen‏ @jlouis666 29 May 2017
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      Replying to @jedisct1 @CopperheadOS @veorq

      o.O That is interesting and surprising. I’d regard that as an error. Anyone know why it takes minutes? Pool doesn’t have the usual sources?

      2 replies 0 retweets 0 likes
      Frank‏ @jedisct1 29 May 2017
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      Replying to @jlouis666 @CopperheadOS @veorq

      virtio RNG not available, network interfaces not mounted yet.

      5:46 AM - 29 May 2017
      0 replies 0 retweets 0 likes

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