Re: [PATCH RFC v4 1/1] random: WARN on large getrandom() waits and introduce getrandom2()

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To: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH RFC v4 1/1] random: WARN on large getrandom() waits and introduce getrandom2()
From: Matthew Garrett <mjg59@xxxxxxxxxxxxx>
Date: Fri, 20 Sep 2019 21:17:47 +0100
Cc: Andy Lutomirski <luto@xxxxxxxxxx>, "Ahmed S. Darwish" <darwish.07@xxxxxxxxx>, Lennart Poettering <mzxreary@xxxxxxxxxxx>, "Theodore Y. Ts'o" <tytso@xxxxxxx>, "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>, "Alexander E. Patrakov" <patrakov@xxxxxxxxx>, Michael Kerrisk <mtk.manpages@xxxxxxxxx>, Willy Tarreau <w@xxxxxx>, lkml <linux-kernel@xxxxxxxxxxxxxxx>, Ext4 Developers List <linux-ext4@xxxxxxxxxxxxxxx>, Linux API <linux-api@xxxxxxxxxxxxxxx>, linux-man <linux-man@xxxxxxxxxxxxxxx>
In-reply-to: <CAHk-=whJ3kmcZp=Ws+uXnRB9KokG6nXSQCSuBnerG--jkAfP5w@mail.gmail.com>
References: <20190918211503.GA1808@darwi-home-pc> <20190918211713.GA2225@darwi-home-pc> <CAHk-=wiCqDiU7SE3FLn2W26MS_voUAuqj5XFa1V_tiGTrrW-zQ@mail.gmail.com> <20190920134609.GA2113@pc> <CALCETrWvE5es3i+to33y6jw=Yf0Tw6ZfV-6QWjZT5v0fo76tWw@mail.gmail.com> <CAHk-=wgW8rN2EVL_Rdn63V9vQO0GkZ=RQFeqqsYJM==8fujpPg@mail.gmail.com> <CALCETrV=4TX2a4uV5t2xOFzv+zM_jnOtMLJna8Vb7uXz6S=wSw@mail.gmail.com> <CAHk-=wjpTWgpo6d24pTv+ubfea_uEomX-sHjjOkdACfV-8Nmkg@mail.gmail.com> <CALCETrUEqjFmPvpcJQwJe3dNbz8eaJ4k3_AV2u0v96MffjLn+g@mail.gmail.com> <CAHk-=whJ3kmcZp=Ws+uXnRB9KokG6nXSQCSuBnerG--jkAfP5w@mail.gmail.com>
User-agent: NeoMutt/20170113 (1.7.2)

On Fri, Sep 20, 2019 at 12:51:12PM -0700, Linus Torvalds wrote:

> So we absolutely _will_ come up with some way 0 ends the wait. Whether
> it's _just_ a timeout, or whether it's jitter-entropy or whatever, it
> will happen.

FWIW, Zircon uses the jitter entropy generator to seed the CRNG and 
documented their findings in 
https://fuchsia.dev/fuchsia-src/zircon/jitterentropy/config-basic .
-- 
Matthew Garrett | mjg59@xxxxxxxxxxxxx

References:
- [PATCH RFC v4 0/1] random: WARN on large getrandom() waits and introduce getrandom2()
  - From: Ahmed S. Darwish
- [PATCH RFC v4 1/1] random: WARN on large getrandom() waits and introduce getrandom2()
  - From: Ahmed S. Darwish
- Re: [PATCH RFC v4 1/1] random: WARN on large getrandom() waits and introduce getrandom2()
  - From: Linus Torvalds
- Re: [PATCH RFC v4 1/1] random: WARN on large getrandom() waits and introduce getrandom2()
  - From: Ahmed S. Darwish
- Re: [PATCH RFC v4 1/1] random: WARN on large getrandom() waits and introduce getrandom2()
  - From: Andy Lutomirski
- Re: [PATCH RFC v4 1/1] random: WARN on large getrandom() waits and introduce getrandom2()
  - From: Linus Torvalds
- Re: [PATCH RFC v4 1/1] random: WARN on large getrandom() waits and introduce getrandom2()
  - From: Andy Lutomirski
- Re: [PATCH RFC v4 1/1] random: WARN on large getrandom() waits and introduce getrandom2()
  - From: Linus Torvalds
- Re: [PATCH RFC v4 1/1] random: WARN on large getrandom() waits and introduce getrandom2()
  - From: Andy Lutomirski
- Re: [PATCH RFC v4 1/1] random: WARN on large getrandom() waits and introduce getrandom2()
  - From: Linus Torvalds

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