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Commit Graph

9 Commits

Author SHA1 Message Date
Jason A. Donenfeld
ffa047a03e random-util: remove RDRAND usage
/dev/urandom is seeded with RDRAND. Calling genuine_random_bytes(...,
..., 0) will use /dev/urandom as a last resort. Hence, we gain nothing
here by having our own RDRAND wrapper, because /dev/urandom already is
based on RDRAND output, even before /dev/urandom has fully initialized.

Furthermore, RDRAND is not actually fast! And on each successive
generation of new x86 CPUs, from both AMD and Intel, it just gets
slower.

This commit simplifies things by just using /dev/urandom in cases where
we before might use RDRAND, since /dev/urandom will always have RDRAND
mixed in as part of it.

And above where I say "/dev/urandom", what I actually mean is
GRND_INSECURE, which is the same thing but won't generate warnings in
dmesg.
2022-03-14 19:47:13 +00:00
Zbigniew Jędrzejewski-Szmek
0aff7b7584 docs: add spdx tags to all .md files
I have no idea if this is going to cause rendering problems, and it is fairly
hard to check. So let's just merge this, and if it github markdown processor
doesn't like it, revert.
2021-09-27 09:19:02 +02:00
Zbigniew Jędrzejewski-Szmek
37b22b3b47 tree: wide "the the" and other trivial grammar fixes 2020-07-02 09:51:38 +02:00
Lennart Poettering
18d9cee002 man: document systemd.random-seed= 2020-06-24 15:33:48 +02:00
Lennart Poettering
21385e639a man: replace perl bug tracker link that went away with link to paper
Fixes: #16245
2020-06-23 17:19:05 +02:00
Tobias Bernard
b41a3f66c9 docs: make it pretty
Add custom Jekyll theme, logo, webfont and .gitignore

FIXME: the markdown files have some H1 headers which need to be replaced
with H2
2019-12-11 17:04:20 +01:00
Lennart Poettering
4cdca0af11 docs: place all our markdown docs in rough categories 2019-12-11 10:53:00 +01:00
Lennart Poettering
d35c77412a docs: fix env var name in random seed markdown documentation 2019-08-11 06:10:58 +09:00
Lennart Poettering
93f5910078 docs: add longer document about systemd and random number seeds 2019-07-25 18:31:20 +02:00