D55306.diff
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	diff --git a/lib/libsys/pdfork.2 b/lib/libsys/pdfork.2
	--- a/lib/libsys/pdfork.2
	+++ b/lib/libsys/pdfork.2
	@@ -114,11 +114,13 @@
	flags.
	The
	.Fn pdrfork
	-system call requires that the
	+system call requires that both the
	.Va RFPROC
	-or
	+and
	+.Va RFPROCDESC
	+flags, or
	.Va RFSPAWN
	-flag is specified.
	+flag are specified.
	.Pp
	.Fn pdgetpid
	queries the process ID (PID) in the process descriptor
	diff --git a/sys/kern/kern_fork.c b/sys/kern/kern_fork.c
	--- a/sys/kern/kern_fork.c
	+++ b/sys/kern/kern_fork.c
	@@ -214,6 +214,11 @@
	fr.fr_flags = RFFDG \| RFPROC \| RFPPWAIT \| RFMEM \| RFPROCDESC;
	fr.fr_flags2 = FR2_DROPSIG_CAUGHT;
	} else {
	+ if ((uap->rfflags & (RFPROC \| RFPROCDESC)) !=
	+ (RFPROC \| RFPROCDESC)) {
	+ return (EXTERROR(EINVAL,
	+ "RFPROC\|RFPROCDESC required %#jx", uap->rfflags));
	+ }
	fr.fr_flags = uap->rfflags;
	}