D41280.id125434.diff
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D41280.id125434.diff
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	diff --git a/sys/kern/subr_kdb.c b/sys/kern/subr_kdb.c
	--- a/sys/kern/subr_kdb.c
	+++ b/sys/kern/subr_kdb.c
	@@ -503,11 +503,19 @@
	}

	static bool
	-kdb_backend_permitted(struct kdb_dbbe be, struct ucred cred)
	+kdb_backend_permitted(struct kdb_dbbe be, struct thread td)
	{
	+ struct ucred *cred;
	int error;

	- error = securelevel_gt(cred, kdb_enter_securelevel);
	+ cred = td->td_ucred;
	+ if (cred == NULL) {
	+ KASSERT(td == &thread0 && cold,
	+ ("%s: missing cred for %p", __func__, td));
	+ error = 0;
	+ } else {
	+ error = securelevel_gt(cred, kdb_enter_securelevel);
	+ }
	#ifdef MAC
	/*
	* Give MAC a chance to weigh in on the policy: if the securelevel is
	@@ -776,7 +784,7 @@
	cngrab();

	for (;;) {
	- if (!kdb_backend_permitted(be, curthread->td_ucred)) {
	+ if (!kdb_backend_permitted(be, curthread)) {
	/* Unhandled breakpoint traps are fatal. */
	handled = 1;
	break;