--- xnu/xnu-12377.121.6/security/mac_label.c
+++ /dev/null
@@ -1,208 +0,0 @@
-/*-
- * Copyright (c) 2004 Networks Associates Technology, Inc.
- * Copyright (c) 2005 SPARTA, Inc.
- * All rights reserved.
- *
- * This software was developed for the FreeBSD Project in part by Network
- * Associates Laboratories, the Security Research Division of Network
- * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
- * as part of the DARPA CHATS research program.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include <kern/zalloc.h>
-#include <security/_label.h>
-#include <sys/param.h>
-#include <sys/queue.h>
-#include <sys/systm.h>
-#include <security/mac_internal.h>
-
-ZONE_DEFINE_ID(ZONE_ID_MAC_LABEL, "MAC Labels", struct label,
-    ZC_READONLY | ZC_ZFREE_CLEARMEM);
-
-/*
- * Number of initial values matches logic in security/_label.h
- */
-const struct label empty_label = {
-	.l_perpolicy[0 ... MAC_MAX_SLOTS - 1] = MAC_LABEL_NULL_SLOT,
-};
-
-static struct label *
-label_alloc_noinit(int flags)
-{
-	static_assert(MAC_NOWAIT == Z_NOWAIT);
-	return zalloc_ro(ZONE_ID_MAC_LABEL, Z_ZERO | (flags & MAC_NOWAIT));
-}
-
-struct label *
-mac_labelzone_alloc(int flags)
-{
-	struct label *label;
-
-	label = label_alloc_noinit(flags);
-	if (label) {
-		zalloc_ro_update_elem(ZONE_ID_MAC_LABEL, label, &empty_label);
-	}
-
-	return label;
-}
-
-struct label *
-mac_labelzone_alloc_for_owner(struct label **labelp, int flags,
-    void (^extra_setup)(struct label *))
-{
-	struct label *label;
-
-	if (labelp) {
-		struct label tmp_label = empty_label;
-
-		label = zalloc_ro(ZONE_ID_MAC_LABEL, Z_ZERO | (flags & MAC_NOWAIT));
-
-		tmp_label.l_owner = labelp;
-		zalloc_ro_update_elem(ZONE_ID_MAC_LABEL, label, &tmp_label);
-	} else {
-		label = mac_labelzone_alloc(flags);
-	}
-
-	if (label && extra_setup) {
-		extra_setup(label);
-	}
-
-	return label;
-}
-
-struct label *
-mac_labelzone_alloc_owned(struct label **labelp, int flags,
-    void (^extra_setup)(struct label *))
-{
-	struct label *label;
-
-	label = mac_labelzone_alloc_for_owner(labelp, flags, extra_setup);
-
-	if (labelp) {
-		*labelp = label;
-	}
-
-	return label;
-}
-
-void
-mac_labelzone_free(struct label *label)
-{
-	if (label == NULL) {
-		panic("Free of NULL MAC label");
-	}
-
-	zfree_ro(ZONE_ID_MAC_LABEL, label);
-}
-
-void
-mac_labelzone_free_owned(struct label **labelp,
-    void (^extra_deinit)(struct label *))
-{
-	struct label *label;
-
-	label = mac_label_verify(labelp);
-	if (label) {
-		if (extra_deinit) {
-			extra_deinit(label);
-		}
-
-		os_atomic_store(labelp, NULL, release);
-		mac_labelzone_free(label);
-	}
-}
-
-struct label *
-mac_label_verify(struct label **labelp)
-{
-	struct label *label = os_atomic_load(labelp, acquire);
-
-	if (label != NULL) {
-		zone_require_ro(ZONE_ID_MAC_LABEL, sizeof(struct label), label);
-
-		if (__improbable(label->l_owner != labelp)) {
-			panic("label backref mismatch: labelp:%p label:%p l_owner:%p", labelp,
-			    label, label->l_owner);
-		}
-	}
-
-	return label;
-}
-
-static intptr_t
-mac_label_slot_encode(intptr_t p)
-{
-	return p ?: MAC_LABEL_NULL_SLOT;
-}
-
-static intptr_t
-mac_label_slot_decode(intptr_t p)
-{
-	switch (p) {
-	case 0:
-		/* make sure 0 doesn't mean NULL and causes crashes */
-		return MAC_LABEL_NULL_SLOT;
-	case MAC_LABEL_NULL_SLOT:
-		return 0l;
-	default:
-		return p;
-	}
-}
-
-/*
- * Functions used by policy modules to get and set label values.
- */
-intptr_t
-mac_label_get(struct label *label, int slot)
-{
-	KASSERT(label != NULL, ("mac_label_get: NULL label"));
-
-	zone_require_ro(ZONE_ID_MAC_LABEL, sizeof(struct label), label);
-	return mac_label_slot_decode((intptr_t) label->l_perpolicy[slot]);
-}
-
-__abortlike
-static void
-panic_label_set_sentinel(void)
-{
-	panic("cannot set mac label to ~0");
-}
-
-void
-mac_label_set(struct label *label, int slot, intptr_t v)
-{
-	KASSERT(label != NULL, ("mac_label_set: NULL label"));
-
-#if DEVELOPMENT || DEBUG
-	/* can't modify a sealed label, see mac_cred_label_seal() */
-	assertf(label->l_owner != (struct label **)-1,
-	    "mac_label_set(%p, %d, 0x%lx) is sealed",
-	    label, slot, (uintptr_t)v);
-#endif
-	if (v == MAC_LABEL_NULL_SLOT) {
-		panic_label_set_sentinel();
-	}
-	v = mac_label_slot_encode(v);
-	zalloc_ro_update_field(ZONE_ID_MAC_LABEL, label, l_perpolicy[slot], &v);
-}