Date: Thu, 18 Apr 2019 22:56:32 -0700 From: Enji Cooper <yaneurabeya@gmail.com> To: Conrad Meyer <cem@freebsd.org> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r346358 - in head: . sys/dev/random sys/libkern sys/mips/conf sys/sys Message-ID: <A7DB74C8-B362-4289-B1EE-8B77CAD996D1@gmail.com> In-Reply-To: <201904182048.x3IKmtG2073301@repo.freebsd.org> References: <201904182048.x3IKmtG2073301@repo.freebsd.org>
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> On Apr 18, 2019, at 13:48, Conrad Meyer <cem@freebsd.org> wrote: >=20 > Author: cem > Date: Thu Apr 18 20:48:54 2019 > New Revision: 346358 > URL: https://svnweb.freebsd.org/changeset/base/346358 >=20 > Log: > random(4): Restore availability tradeoff prior to r346250 >=20 > As discussed in that commit message, it is a dangerous default. But the > safe default causes enough pain on a variety of platforms that for now, > restore the prior default. >=20 > Some of this is self-induced pain we should/could do better about; for > example, programmatic CI systems and VM managers should introduce entropy= > from the host for individual VM instances. This is considered a future w= ork > item. >=20 > On modern x86 and Power9 systems, this may be wholly unnecessary after > D19928 lands (even in the non-ideal case where early /boot/entropy is > unavailable), because they have fast hardware random sources available ea= rly > in boot. But D19928 is not yet landed and we have a host of architecture= s > which do not provide fast random sources. >=20 > This change adds several tunables and diagnostic sysctls, documented > thoroughly in UPDATING and sys/dev/random/random_infra.c. Thank you for doing this Conrad! One request: can these sysctls/tunables please be documented in random(4)? N= ot everyone has access to UPDATING with binary distributions. Thank you so very much! -Enji=
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