[Bug 206680] kbd race attacks

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206680

--- Comment #2 from CTurt <cturt at hardenedbsd.org> ---
Correct.

I cited `kbd_realloc_array` in my comment because it is the most blatant
example of code which is no longer thread safe, following the removal of
`spltty` and `splx`.

However, it is not just `kbd_realloc_array` which needs to be sorted. The whole
of this source file seems to rely on using `spltty` to prevent race attacks,
which means multiple locks will probably need to be used.

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