https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230870
Bug ID: 230870
Summary: Deprecate Yarrow
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
I think we should deprecate Yarrow as soon as we possibly can. I think it
would be reasonable to gone_in(12) it, even, removing it from tree before
stable/12.
At the very least, it should be gone_in(13)'d and removed after stable/12
branches.
We discussed this briefly on orthogonal devrandom bugs, and one concern raised
was embedded systems may prefer the lower space usage of Yarrow.
In response to that, I quantified the difference in state size and came up with
962 bytes. Do we have embedded systems today that would trade a weak devrandom
for 962 bytes of memory?
I suspect not. IIRC, the smallest system we can run on today is either 32 or
64 MB, and even that requires quite a bit of manual tweaking to get a minimal
kernel and almost no userspace. And on such a 32MB system, 962 bytes is
0.003%. Is that small enough to be de minimis? I think so. If you can't run
with 33553470 bytes of memory it is unlikely you will be able to run with
33554432.
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