jhb b6aef6c787 Check for invalid sstatus values in set_mcontext().
Previously, this check was only in sys_sigreturn() which meant that
user applications could write invalid values to the register via
setcontext() or swapcontext().

Reviewed by:	mhorne
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D23219
2020-01-17 19:13:49 +00:00
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