src-test2/sys/dev/random, branch release/11.4.0

MFC r345438,r345842,r346259,r346261: TPM as possible entropy source

2019-04-26T01:58:36Z

r345438: Allow using TPM as entropy source TPM has a built-in RNG, with its own entropy source. The driver was extended to harvest 16 random bytes from TPM every 10 seconds. A new build option "TPM_HARVEST" was introduced - for now, however, it is not enabled by default in the GENERIC config. Reviewed by: markm, delphij Approved by: secteam r345842: Add a cv_wait to the TPM2.0 harvesting function r346259: tpm: Prevent session hijack r346261: Improve tpm20 style Submitted by: Kornel Duleba Obtained from: Semihalf Sponsored by: Stormshield

Backport fixes from FreeBSD-12 to help the random(4) device thread

2019-04-06T09:00:06Z

not overwhelm the OS: a) Use the correct symbolic constant when calculating 10'ths of a second. This means that expensive reseeds happen at ony 1/10 Hz, not some kHz. b) Rate limit internal high-rate harveting efforts. This stops the harvesting thread from total overkilling the high-grade entropy- gathering work, while still being very conservatively safe. PR: 230808 Reported by: danilo,eugen Tested by: eugen Approved by: so (blanket permission granted as I am the authour of this code) Relnotes: Yes

Partial MFC of r338542:

2018-09-25T05:18:20Z

random(4): Squash non-error timeout code from tsleep(9). PR: 231181 Submitted by: cem Reported by: lev Reviewed by: vangyzen, markm, delphij Approved by: secteam (delphij) Differential Revision: https://reviews.freebsd.org/D17049

Revert previous commit, until issue with sparc64 resolved.

2016-06-09T14:44:05Z

Approved by: so (implicit)

Add a prototype for random_harvest_queue to dev/random/random_harvestq.h

2016-06-09T01:50:43Z

This fixes a warning that occurs in a number of files that use the random_harvest_queue function. Differential Revision: https://reviews.freebsd.org/D4229 Submitted by: stevek@juniper.net Reviewed by: markm Approved by: so

Don't repeat the the word 'the'

2016-05-17T12:52:31Z

(one manual change to fix grammar) Confirmed With: db Approved by: secteam (not really, but this is a comment typo fix)

dev/random: minor spelling fixes in comments.

2016-05-02T14:35:57Z

No functional change. Reviewed by: markm Approved by: so

dev/random: use our roundup() macro instead of re-implementing it.

2016-04-25T21:14:32Z

While here also use howmany() macro from sys/param.h No functional change. Reviewed by: markm (roundup replacement part) Approved by: so

Fix rdrand_rng.ko and padlock_rng.ko dependencies, making modules

2016-04-16T06:10:47Z

loadable when not compiled into the kernel. Approved by: so (delphij) Sponsored by: The FreeBSD Foundation

Don't start the random harvester process until timers are working.

2016-03-28T21:51:56Z

This is a no-op currently, but in kernels with earlier AP startup, the random kthread was trying to use timeouts with sleeps before timers are working. Wait until SI_SUB_KICK_SCHEDULER to start the random kproc. Reviewed by: delphij, imp, markm Approved by: so Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D5712