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kernel: allow sysr1 debugging only for hostowner

--- a/sys/src/9/port/sysproc.c

+++ b/sys/src/9/port/sysproc.c

@@ -17,6 +17,8 @@

 long

 sysr1(ulong*)

 {

+	if(!iseve())

+		error(Eperm);

 	checkpagerefs();

 	return 0;

 }