D3908.diff
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	Index: head/sys/kern/sys_process.c
	===================================================================
	--- head/sys/kern/sys_process.c
	+++ head/sys/kern/sys_process.c
	@@ -744,7 +744,18 @@
	*/
	switch (req) {
	case PT_TRACE_ME:
	- /* Always legal. */
	+ /*
	+ * Always legal, when there is a parent process which
	+ * could trace us. Otherwise, reject.
	+ */
	+ if ((p->p_flag & P_TRACED) != 0) {
	+ error = EBUSY;
	+ goto fail;
	+ }
	+ if (p->p_pptr == initproc) {
	+ error = EPERM;
	+ goto fail;
	+ }
	break;

	case PT_ATTACH: