Alexander Viro wrote:
> 	* verify_area() cleans the value, but you'll be better off
> considering these as dangerous - it only checks that range is OK and if
> pointer arithmetics moves you out of that range or you access piece longer
> than range in question...

Note that verify_area's argument cannot be safely dereferenced if a
parallel thread is able to change the user-space mapping.  This is
usually possible.

-- Jamie
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