K 10
svn:author
V 6
brooks
K 8
svn:date
V 27
2020-04-15T16:33:27.133777Z
K 7
svn:log
V 294
Don't directly access userspace memory.

Rather then using the racy useracc() followed by direct access to
userspace memory, perform a copyin() and use the result if it succeeds.

Reviewed by:	jhb
MFC after:	3 weeks
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D24410

END