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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/security/selinux/avc.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Implementation of the kernel access vector cache (AVC).
34  *
....@@ -8,10 +9,6 @@
89  *	Replaced the avc_lock spinlock by RCU.
910  *
1011  * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
11
- *
12
- *	This program is free software; you can redistribute it and/or modify
13
- *	it under the terms of the GNU General Public License version 2,
14
- *	as published by the Free Software Foundation.
1512  */
1613 #include <linux/types.h>
1714 #include <linux/stddef.h>
....@@ -34,6 +31,9 @@
3431 #include "avc_ss.h"
3532 #include "classmap.h"
3633 
34
+#define CREATE_TRACE_POINTS
35
+#include <trace/events/avc.h>
36
+
3737 #define AVC_CACHE_SLOTS			512
3838 #define AVC_DEF_CACHE_THRESHOLD		512
3939 #define AVC_CACHE_RECLAIM		16
....@@ -43,6 +43,9 @@
4343 #else
4444 #define avc_cache_stats_incr(field)	do {} while (0)
4545 #endif
46
+
47
+#undef CREATE_TRACE_POINTS
48
+#include <trace/hooks/avc.h>
4649 
4750 struct avc_entry {
4851 	u32			ssid;
....@@ -127,75 +130,6 @@
127130 static inline int avc_hash(u32 ssid, u32 tsid, u16 tclass)
128131 {
129132 	return (ssid ^ (tsid<<2) ^ (tclass<<4)) & (AVC_CACHE_SLOTS - 1);
130
-}
131
-
132
-/**
133
- * avc_dump_av - Display an access vector in human-readable form.
134
- * @tclass: target security class
135
- * @av: access vector
136
- */
137
-static void avc_dump_av(struct audit_buffer *ab, u16 tclass, u32 av)
138
-{
139
-	const char **perms;
140
-	int i, perm;
141
-
142
-	if (av == 0) {
143
-		audit_log_format(ab, " null");
144
-		return;
145
-	}
146
-
147
-	BUG_ON(!tclass || tclass >= ARRAY_SIZE(secclass_map));
148
-	perms = secclass_map[tclass-1].perms;
149
-
150
-	audit_log_format(ab, " {");
151
-	i = 0;
152
-	perm = 1;
153
-	while (i < (sizeof(av) * 8)) {
154
-		if ((perm & av) && perms[i]) {
155
-			audit_log_format(ab, " %s", perms[i]);
156
-			av &= ~perm;
157
-		}
158
-		i++;
159
-		perm <<= 1;
160
-	}
161
-
162
-	if (av)
163
-		audit_log_format(ab, " 0x%x", av);
164
-
165
-	audit_log_format(ab, " }");
166
-}
167
-
168
-/**
169
- * avc_dump_query - Display a SID pair and a class in human-readable form.
170
- * @ssid: source security identifier
171
- * @tsid: target security identifier
172
- * @tclass: target security class
173
- */
174
-static void avc_dump_query(struct audit_buffer *ab, struct selinux_state *state,
175
-			   u32 ssid, u32 tsid, u16 tclass)
176
-{
177
-	int rc;
178
-	char *scontext;
179
-	u32 scontext_len;
180
-
181
-	rc = security_sid_to_context(state, ssid, &scontext, &scontext_len);
182
-	if (rc)
183
-		audit_log_format(ab, "ssid=%d", ssid);
184
-	else {
185
-		audit_log_format(ab, "scontext=%s", scontext);
186
-		kfree(scontext);
187
-	}
188
-
189
-	rc = security_sid_to_context(state, tsid, &scontext, &scontext_len);
190
-	if (rc)
191
-		audit_log_format(ab, " tsid=%d", tsid);
192
-	else {
193
-		audit_log_format(ab, " tcontext=%s", scontext);
194
-		kfree(scontext);
195
-	}
196
-
197
-	BUG_ON(!tclass || tclass >= ARRAY_SIZE(secclass_map));
198
-	audit_log_format(ab, " tclass=%s", secclass_map[tclass-1].name);
199133 }
200134 
201135 /**
....@@ -510,6 +444,7 @@
510444 
511445 static void avc_node_delete(struct selinux_avc *avc, struct avc_node *node)
512446 {
447
+	trace_android_vh_selinux_avc_node_delete(node);
513448 	hlist_del_rcu(&node->list);
514449 	call_rcu(&node->rhead, avc_node_free);
515450 	atomic_dec(&avc->avc_cache.active_nodes);
....@@ -526,6 +461,7 @@
526461 static void avc_node_replace(struct selinux_avc *avc,
527462 			     struct avc_node *new, struct avc_node *old)
528463 {
464
+	trace_android_vh_selinux_avc_node_replace(old, new);
529465 	hlist_replace_rcu(&old->list, &new->list);
530466 	call_rcu(&old->rhead, avc_node_free);
531467 	atomic_dec(&avc->avc_cache.active_nodes);
....@@ -634,8 +570,10 @@
634570 	avc_cache_stats_incr(lookups);
635571 	node = avc_search_node(avc, ssid, tsid, tclass);
636572 
637
-	if (node)
573
+	if (node) {
574
+		trace_android_vh_selinux_avc_lookup(node, ssid, tsid, tclass);
638575 		return node;
576
+	}
639577 
640578 	avc_cache_stats_incr(misses);
641579 	return NULL;
....@@ -719,6 +657,7 @@
719657 		}
720658 	}
721659 	hlist_add_head_rcu(&node->list, head);
660
+	trace_android_vh_selinux_avc_insert(node);
722661 found:
723662 	spin_unlock_irqrestore(lock, flag);
724663 	return node;
....@@ -733,11 +672,36 @@
733672 static void avc_audit_pre_callback(struct audit_buffer *ab, void *a)
734673 {
735674 	struct common_audit_data *ad = a;
736
-	audit_log_format(ab, "avc:  %s ",
737
-			 ad->selinux_audit_data->denied ? "denied" : "granted");
738
-	avc_dump_av(ab, ad->selinux_audit_data->tclass,
739
-			ad->selinux_audit_data->audited);
740
-	audit_log_format(ab, " for ");
675
+	struct selinux_audit_data *sad = ad->selinux_audit_data;
676
+	u32 av = sad->audited;
677
+	const char **perms;
678
+	int i, perm;
679
+
680
+	audit_log_format(ab, "avc:  %s ", sad->denied ? "denied" : "granted");
681
+
682
+	if (av == 0) {
683
+		audit_log_format(ab, " null");
684
+		return;
685
+	}
686
+
687
+	perms = secclass_map[sad->tclass-1].perms;
688
+
689
+	audit_log_format(ab, " {");
690
+	i = 0;
691
+	perm = 1;
692
+	while (i < (sizeof(av) * 8)) {
693
+		if ((perm & av) && perms[i]) {
694
+			audit_log_format(ab, " %s", perms[i]);
695
+			av &= ~perm;
696
+		}
697
+		i++;
698
+		perm <<= 1;
699
+	}
700
+
701
+	if (av)
702
+		audit_log_format(ab, " 0x%x", av);
703
+
704
+	audit_log_format(ab, " } for ");
741705 }
742706 
743707 /**
....@@ -749,14 +713,57 @@
749713 static void avc_audit_post_callback(struct audit_buffer *ab, void *a)
750714 {
751715 	struct common_audit_data *ad = a;
752
-	audit_log_format(ab, " ");
753
-	avc_dump_query(ab, ad->selinux_audit_data->state,
754
-		       ad->selinux_audit_data->ssid,
755
-		       ad->selinux_audit_data->tsid,
756
-		       ad->selinux_audit_data->tclass);
757
-	if (ad->selinux_audit_data->denied) {
758
-		audit_log_format(ab, " permissive=%u",
759
-				 ad->selinux_audit_data->result ? 0 : 1);
716
+	struct selinux_audit_data *sad = ad->selinux_audit_data;
717
+	char *scontext = NULL;
718
+	char *tcontext = NULL;
719
+	const char *tclass = NULL;
720
+	u32 scontext_len;
721
+	u32 tcontext_len;
722
+	int rc;
723
+
724
+	rc = security_sid_to_context(sad->state, sad->ssid, &scontext,
725
+				     &scontext_len);
726
+	if (rc)
727
+		audit_log_format(ab, " ssid=%d", sad->ssid);
728
+	else
729
+		audit_log_format(ab, " scontext=%s", scontext);
730
+
731
+	rc = security_sid_to_context(sad->state, sad->tsid, &tcontext,
732
+				     &tcontext_len);
733
+	if (rc)
734
+		audit_log_format(ab, " tsid=%d", sad->tsid);
735
+	else
736
+		audit_log_format(ab, " tcontext=%s", tcontext);
737
+
738
+	tclass = secclass_map[sad->tclass-1].name;
739
+	audit_log_format(ab, " tclass=%s", tclass);
740
+
741
+	if (sad->denied)
742
+		audit_log_format(ab, " permissive=%u", sad->result ? 0 : 1);
743
+
744
+	trace_selinux_audited(sad, scontext, tcontext, tclass);
745
+	kfree(tcontext);
746
+	kfree(scontext);
747
+
748
+	/* in case of invalid context report also the actual context string */
749
+	rc = security_sid_to_context_inval(sad->state, sad->ssid, &scontext,
750
+					   &scontext_len);
751
+	if (!rc && scontext) {
752
+		if (scontext_len && scontext[scontext_len - 1] == '\0')
753
+			scontext_len--;
754
+		audit_log_format(ab, " srawcon=");
755
+		audit_log_n_untrustedstring(ab, scontext, scontext_len);
756
+		kfree(scontext);
757
+	}
758
+
759
+	rc = security_sid_to_context_inval(sad->state, sad->tsid, &scontext,
760
+					   &scontext_len);
761
+	if (!rc && scontext) {
762
+		if (scontext_len && scontext[scontext_len - 1] == '\0')
763
+			scontext_len--;
764
+		audit_log_format(ab, " trawcon=");
765
+		audit_log_n_untrustedstring(ab, scontext, scontext_len);
766
+		kfree(scontext);
760767 	}
761768 }
762769 
....@@ -768,6 +775,9 @@
768775 {
769776 	struct common_audit_data stack_data;
770777 	struct selinux_audit_data sad;
778
+
779
+	if (WARN_ON(!tclass || tclass >= ARRAY_SIZE(secclass_map)))
780
+		return -EINVAL;
771781 
772782 	if (!a) {
773783 		a = &stack_data;
....@@ -1052,7 +1062,8 @@
10521062 	int rc = 0, rc2;
10531063 
10541064 	xp_node = &local_xp_node;
1055
-	BUG_ON(!requested);
1065
+	if (WARN_ON(!requested))
1066
+		return -EACCES;
10561067 
10571068 	rcu_read_lock();
10581069 
....@@ -1142,7 +1153,8 @@
11421153 	int rc = 0;
11431154 	u32 denied;
11441155 
1145
-	BUG_ON(!requested);
1156
+	if (WARN_ON(!requested))
1157
+		return -EACCES;
11461158 
11471159 	rcu_read_lock();
11481160