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cem 4c79b5f69c random(4): Restore availability tradeoff prior to r346250
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.

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 work
item.

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 early
in boot.  But D19928 is not yet landed and we have a host of architectures
which do not provide fast random sources.

This change adds several tunables and diagnostic sysctls, documented
thoroughly in UPDATING and sys/dev/random/random_infra.c.

PR:		230875 (reopens)
Reported by:	adrian, jhb, imp, and probably others
Reviewed by:	delphij, imp (earlier version), markm (earlier version)
Discussed with:	adrian
Approved by:	secteam(delphij)
Relnotes:	yeah
Security:	related
Differential Revision:	https://reviews.freebsd.org/D19944
2019-04-18 20:48:54 +00:00
bin .Xr trim(8) from dd(1). 2019-03-26 15:44:06 +00:00
cddl Drop -g from CFLAGS for zfsd(8). No idea why it was ever there. 2019-04-16 12:25:15 +00:00
contrib readelf: use size_t for object counts 2019-04-17 17:50:44 +00:00
crypto Add workaround for a QoS-related bug in VMWare Workstation. 2019-03-27 15:17:29 +00:00
etc Compile and install most of the googletest examples 2019-03-11 19:50:44 +00:00
gnu Fix gdb/kgdb build under WITH_PIE 2019-04-01 19:19:51 +00:00
include Introduce funlinkat syscall that always us to check if we are removing 2019-04-06 09:34:26 +00:00
kerberos5 Add WITH_PIE knob to build Position Independent Executables 2019-02-15 22:22:38 +00:00
lib Implement flag for telling cuse(3) clients if the peer is running in 32-bit 2019-04-18 19:04:07 +00:00
libexec Fix order of destructors between main binary and libraries. 2019-04-15 13:03:09 +00:00
release Add support for cross-building cloudware images. 2019-04-03 21:54:47 +00:00
rescue rescue: set NO_SHARED in Makefile 2018-11-19 22:18:18 +00:00
sbin cap_fileargs: chase r346315, update fileargs_init in consumers 2019-04-17 16:18:14 +00:00
secure Add workaround for a QoS-related bug in VMWare Workstation. 2019-03-27 15:17:29 +00:00
share Add a bugs section to pflog man page 2019-04-18 11:06:45 +00:00
stand Minor tweak to the debug 2019-04-18 15:19:19 +00:00
sys random(4): Restore availability tradeoff prior to r346250 2019-04-18 20:48:54 +00:00
targets retire LINKER_FEATURES filter flag 2018-11-12 20:44:22 +00:00
tests pf tests: Fail the test if we can't set the rules 2019-04-18 10:54:08 +00:00
tools As an interim measure until a more permanent solution is implemented 2019-04-18 01:02:00 +00:00
usr.bin cap_fileargs: chase r346315, update fileargs_init in consumers 2019-04-17 16:18:14 +00:00
usr.sbin config: Only warn if duplicate option/device comes from the same file 2019-04-16 20:08:19 +00:00
.arcconfig callsign isn't required anymore 2016-09-29 06:19:45 +00:00
.arclint arc lint: ignore /tests/ in chmod 2017-12-19 03:38:06 +00:00
.cirrus.yml Cirrus-CI: pass OVMF env var to test script for upcoming changes 2019-04-11 13:01:26 +00:00
.gitattributes MK_ZFS -> {MK_ZFS|MK_LOADER_ZFS}, this is so we can diable userland / kernel 2019-01-05 22:45:20 +00:00
.gitignore Ignore _.universe-toolchain file. 2018-07-01 13:50:37 +00:00
COPYRIGHT Happy New Year 2019! 2019-01-01 00:25:25 +00:00
LOCKS LOCKS: update current locks 2018-06-09 03:08:04 +00:00
MAINTAINERS Add note that I'm the defacto maintainer of libegacy, our 2019-04-18 15:19:28 +00:00
Makefile Fix a typo when sanity checking in the bootstrap-tools target 2019-04-09 16:17:31 +00:00
Makefile.inc1 pkgbase: Use uname as ABI_FILE 2019-03-27 17:55:39 +00:00
Makefile.libcompat Use ...-freebsd13.0 in -target strings. 2018-11-12 16:55:20 +00:00
Makefile.sys.inc AUTO_OBJ: For all top-level targets enforce using an OBJDIR. 2017-12-05 21:29:47 +00:00
ObsoleteFiles.inc Set tentative merge date, and bump __FreeBSD_version. 2019-03-04 19:23:11 +00:00
README README: add generic notes about GENERIC and NOTES 2018-06-17 19:44:24 +00:00
README.md README: add generic notes about GENERIC and NOTES 2018-06-17 19:44:24 +00:00
UPDATING random(4): Restore availability tradeoff prior to r346250 2019-04-18 20:48:54 +00:00

FreeBSD Source:

This is the top level of the FreeBSD source directory. This file was last revised on: FreeBSD

FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.

For copyright information, please see the file COPYRIGHT in this directory. Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information.

The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7), config(8), https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html, and https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information, including setting make(1) variables.

Source Roadmap:

bin		System/user commands.

cddl		Various commands and libraries under the Common Development
		and Distribution License.

contrib		Packages contributed by 3rd parties.

crypto		Cryptography stuff (see crypto/README).

etc		Template files for /etc.

gnu		Various commands and libraries under the GNU Public License.
		Please see gnu/COPYING* for more information.

include		System include files.

kerberos5	Kerberos5 (Heimdal) package.

lib		System libraries.

libexec		System daemons.

release		Release building Makefile & associated tools.

rescue		Build system for statically linked /rescue utilities.

sbin		System commands.

secure		Cryptographic libraries and commands.

share		Shared resources.

stand		Boot loader sources.

sys		Kernel sources.

sys/<arch>/conf Kernel configuration files. GENERIC is the configuration
		used in release builds. NOTES contains documentation of
		all possible entries.

tests		Regression tests which can be run by Kyua.  See tests/README
		for additional information.

tools		Utilities for regression testing and miscellaneous tasks.

usr.bin		User commands.

usr.sbin	System administration commands.

For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see:

https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/current-stable.html