11.1/allow-init-ptrace-itself.diff

Allow init(8) to ptrace(2) itself.

diff -ru --exclude-from freebsd-src-diff-exclude-names /usr/src/sys/kern/sys_process.c freebsd-11.1/usr/src/sys/kern/sys_process.c
--- /usr/src/sys/kern/sys_process.c	2019-03-16 23:27:17.474690000 +0800
+++ freebsd-11.1/usr/src/sys/kern/sys_process.c	2019-03-22 11:48:41.978201000 +0800
@@ -823,10 +823,6 @@
 			error = EBUSY;
 			goto fail;
 		}
-		if (p->p_pptr == initproc) {
-			error = EPERM;
-			goto fail;
-		}
 		break;
 
 	case PT_ATTACH: