[Bug 209661] amd64_set_ioperm overflow

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209661

Konstantin Belousov <kib at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kib at FreeBSD.org

--- Comment #3 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to CTurt from comment #2)
Suppose that uap->start is > 0x80000000, and uap->length is large enough so
that the sum appears under the 3 pages * 8.  Then negative i falls under the
loop condition and causes wrong accesses.

WRT return of success in this case, right, thank you for noting, I will fix it
as well.

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