That bit is clearly untrue.
> My feeling has been that ACPI has violated the minimum privilege
> concept from the beginning, although I think putting stuff in drivers
> that could be at user level is not htat uncommon in Linux.
It still seems to lack even basic checks that the writes AML does are into
E820 NV or device space only - also while fixing it the ACPI guys might note
that a write close to 0xFFFFFFFF will lead to a failed ioremap and a nasty
mess because they ioremap a fixed sized window that will wrap
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