[Bug 214885] random.{4,7} [man-pages 5.13] do not reflect changes to /dev/random semantics since kernel 5.6

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=214885

Mingye Wang (arthur200126@gmail.com) changed:

           What    |Removed                     |Added
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                 CC|                            |arthur200126@gmail.com

--- Comment #1 from Mingye Wang (arthur200126@gmail.com) ---
Ha, can confirm. Was putting my nose through these things starting with
https://words.filippo.io/dispatches/linux-csprng/.

Things to change:

## random.7

* We should remove the concept of a "blocking pool".
* GRND_RANDOM is no longer a thing. Remove the two rows.

filippo also questions the wisdom of recommending people to roll their own
PRNG, now that the ChaCha stuff is much faster. I don't know.

filippo reports that 5.4 (commit
https://github.com/torvalds/linux/commit/50ee7529ec4500c88f8664560770a7a1b65db72b)
has some magic to get entropy from jitter. We should document this behavior so
people know blocking will not be that bad.

## random.4

Yep, that's gonna be painful. I recommend adding a sub section for "pre-5.6
behavior".

## getrandom.2

Removal of GRND_RANDOM shall be noted.

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