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1 /* 1 /*
2 * Implementation of the kernel access vector 2 * Implementation of the kernel access vector cache (AVC).
3 * 3 *
4 * Authors: Stephen Smalley, <sds@epoch.ncsc. 4 * Authors: Stephen Smalley, <sds@epoch.ncsc.mil>
5 * James Morris <jmorris@redhat.com> 5 * James Morris <jmorris@redhat.com>
6 * 6 *
7 * Update: KaiGai, Kohei <kaigai@ak.jp.nec.c 7 * Update: KaiGai, Kohei <kaigai@ak.jp.nec.com>
8 * Replaced the avc_lock spinlock by RCU. 8 * Replaced the avc_lock spinlock by RCU.
9 * 9 *
10 * Copyright (C) 2003 Red Hat, Inc., James Mor 10 * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
11 * 11 *
12 * This program is free software; you can 12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General 13 * it under the terms of the GNU General Public License version 2,
14 * as published by the Free Software Foun 14 * as published by the Free Software Foundation.
15 */ 15 */
16 #include <linux/types.h> 16 #include <linux/types.h>
17 #include <linux/stddef.h> 17 #include <linux/stddef.h>
18 #include <linux/kernel.h> 18 #include <linux/kernel.h>
19 #include <linux/slab.h> 19 #include <linux/slab.h>
20 #include <linux/fs.h> 20 #include <linux/fs.h>
21 #include <linux/dcache.h> 21 #include <linux/dcache.h>
22 #include <linux/init.h> 22 #include <linux/init.h>
23 #include <linux/skbuff.h> 23 #include <linux/skbuff.h>
24 #include <linux/percpu.h> 24 #include <linux/percpu.h>
25 #include <net/sock.h> 25 #include <net/sock.h>
26 #include <linux/un.h> 26 #include <linux/un.h>
27 #include <net/af_unix.h> 27 #include <net/af_unix.h>
28 #include <linux/ip.h> 28 #include <linux/ip.h>
29 #include <linux/audit.h> 29 #include <linux/audit.h>
30 #include <linux/ipv6.h> 30 #include <linux/ipv6.h>
31 #include <net/ipv6.h> 31 #include <net/ipv6.h>
32 #include "avc.h" 32 #include "avc.h"
33 #include "avc_ss.h" 33 #include "avc_ss.h"
34 34
35 static const struct av_perm_to_string av_perm_ 35 static const struct av_perm_to_string av_perm_to_string[] = {
36 #define S_(c, v, s) { c, v, s }, 36 #define S_(c, v, s) { c, v, s },
37 #include "av_perm_to_string.h" 37 #include "av_perm_to_string.h"
38 #undef S_ 38 #undef S_
39 }; 39 };
40 40
41 static const char *class_to_string[] = { 41 static const char *class_to_string[] = {
42 #define S_(s) s, 42 #define S_(s) s,
43 #include "class_to_string.h" 43 #include "class_to_string.h"
44 #undef S_ 44 #undef S_
45 }; 45 };
46 46
47 #define TB_(s) static const char * s [] = { 47 #define TB_(s) static const char * s [] = {
48 #define TE_(s) }; 48 #define TE_(s) };
49 #define S_(s) s, 49 #define S_(s) s,
50 #include "common_perm_to_string.h" 50 #include "common_perm_to_string.h"
51 #undef TB_ 51 #undef TB_
52 #undef TE_ 52 #undef TE_
53 #undef S_ 53 #undef S_
54 54
55 static const struct av_inherit av_inherit[] = 55 static const struct av_inherit av_inherit[] = {
56 #define S_(c, i, b) { c, common_##i##_perm_to_ 56 #define S_(c, i, b) { c, common_##i##_perm_to_string, b },
57 #include "av_inherit.h" 57 #include "av_inherit.h"
58 #undef S_ 58 #undef S_
59 }; 59 };
60 60
61 const struct selinux_class_perm selinux_class_ 61 const struct selinux_class_perm selinux_class_perm = {
62 av_perm_to_string, 62 av_perm_to_string,
63 ARRAY_SIZE(av_perm_to_string), 63 ARRAY_SIZE(av_perm_to_string),
64 class_to_string, 64 class_to_string,
65 ARRAY_SIZE(class_to_string), 65 ARRAY_SIZE(class_to_string),
66 av_inherit, 66 av_inherit,
67 ARRAY_SIZE(av_inherit) 67 ARRAY_SIZE(av_inherit)
68 }; 68 };
69 69
70 #define AVC_CACHE_SLOTS 512 70 #define AVC_CACHE_SLOTS 512
71 #define AVC_DEF_CACHE_THRESHOLD 512 71 #define AVC_DEF_CACHE_THRESHOLD 512
72 #define AVC_CACHE_RECLAIM 16 72 #define AVC_CACHE_RECLAIM 16
73 73
74 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS 74 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
75 #define avc_cache_stats_incr(field) 75 #define avc_cache_stats_incr(field) \
76 do { 76 do { \
77 per_cpu(avc_cache_stats, get_cpu()).fi 77 per_cpu(avc_cache_stats, get_cpu()).field++; \
78 put_cpu(); 78 put_cpu(); \
79 } while (0) 79 } while (0)
80 #else 80 #else
81 #define avc_cache_stats_incr(field) do {} 81 #define avc_cache_stats_incr(field) do {} while (0)
82 #endif 82 #endif
83 83
84 struct avc_entry { 84 struct avc_entry {
85 u32 ssid; 85 u32 ssid;
86 u32 tsid; 86 u32 tsid;
87 u16 tclass; 87 u16 tclass;
88 struct av_decision avd; 88 struct av_decision avd;
89 atomic_t used; /* use 89 atomic_t used; /* used recently */
90 }; 90 };
91 91
92 struct avc_node { 92 struct avc_node {
93 struct avc_entry ae; 93 struct avc_entry ae;
94 struct list_head list; 94 struct list_head list;
95 struct rcu_head rhead; 95 struct rcu_head rhead;
96 }; 96 };
97 97
98 struct avc_cache { 98 struct avc_cache {
99 struct list_head slots[AVC_CACH 99 struct list_head slots[AVC_CACHE_SLOTS];
100 spinlock_t slots_lock[AVC 100 spinlock_t slots_lock[AVC_CACHE_SLOTS]; /* lock for writes */
101 atomic_t lru_hint; 101 atomic_t lru_hint; /* LRU hint for reclaim scan */
102 atomic_t active_nodes; 102 atomic_t active_nodes;
103 u32 latest_notif; 103 u32 latest_notif; /* latest revocation notification */
104 }; 104 };
105 105
106 struct avc_callback_node { 106 struct avc_callback_node {
107 int (*callback) (u32 event, u32 ssid, 107 int (*callback) (u32 event, u32 ssid, u32 tsid,
108 u16 tclass, u32 perms 108 u16 tclass, u32 perms,
109 u32 *out_retained); 109 u32 *out_retained);
110 u32 events; 110 u32 events;
111 u32 ssid; 111 u32 ssid;
112 u32 tsid; 112 u32 tsid;
113 u16 tclass; 113 u16 tclass;
114 u32 perms; 114 u32 perms;
115 struct avc_callback_node *next; 115 struct avc_callback_node *next;
116 }; 116 };
117 117
118 /* Exported via selinufs */ 118 /* Exported via selinufs */
119 unsigned int avc_cache_threshold = AVC_DEF_CAC 119 unsigned int avc_cache_threshold = AVC_DEF_CACHE_THRESHOLD;
120 120
121 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS 121 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
122 DEFINE_PER_CPU(struct avc_cache_stats, avc_cac 122 DEFINE_PER_CPU(struct avc_cache_stats, avc_cache_stats) = { 0 };
123 #endif 123 #endif
124 124
125 static struct avc_cache avc_cache; 125 static struct avc_cache avc_cache;
126 static struct avc_callback_node *avc_callbacks 126 static struct avc_callback_node *avc_callbacks;
127 static struct kmem_cache *avc_node_cachep; 127 static struct kmem_cache *avc_node_cachep;
128 128
129 static inline int avc_hash(u32 ssid, u32 tsid, 129 static inline int avc_hash(u32 ssid, u32 tsid, u16 tclass)
130 { 130 {
131 return (ssid ^ (tsid<<2) ^ (tclass<<4) 131 return (ssid ^ (tsid<<2) ^ (tclass<<4)) & (AVC_CACHE_SLOTS - 1);
132 } 132 }
133 133
134 /** 134 /**
135 * avc_dump_av - Display an access vector in h 135 * avc_dump_av - Display an access vector in human-readable form.
136 * @tclass: target security class 136 * @tclass: target security class
137 * @av: access vector 137 * @av: access vector
138 */ 138 */
139 static void avc_dump_av(struct audit_buffer *a 139 static void avc_dump_av(struct audit_buffer *ab, u16 tclass, u32 av)
140 { 140 {
141 const char **common_pts = NULL; 141 const char **common_pts = NULL;
142 u32 common_base = 0; 142 u32 common_base = 0;
143 int i, i2, perm; 143 int i, i2, perm;
144 144
145 if (av == 0) { 145 if (av == 0) {
146 audit_log_format(ab, " null"); 146 audit_log_format(ab, " null");
147 return; 147 return;
148 } 148 }
149 149
150 for (i = 0; i < ARRAY_SIZE(av_inherit) 150 for (i = 0; i < ARRAY_SIZE(av_inherit); i++) {
151 if (av_inherit[i].tclass == tc 151 if (av_inherit[i].tclass == tclass) {
152 common_pts = av_inheri 152 common_pts = av_inherit[i].common_pts;
153 common_base = av_inher 153 common_base = av_inherit[i].common_base;
154 break; 154 break;
155 } 155 }
156 } 156 }
157 157
158 audit_log_format(ab, " {"); 158 audit_log_format(ab, " {");
159 i = 0; 159 i = 0;
160 perm = 1; 160 perm = 1;
161 while (perm < common_base) { 161 while (perm < common_base) {
162 if (perm & av) { 162 if (perm & av) {
163 audit_log_format(ab, " 163 audit_log_format(ab, " %s", common_pts[i]);
164 av &= ~perm; 164 av &= ~perm;
165 } 165 }
166 i++; 166 i++;
167 perm <<= 1; 167 perm <<= 1;
168 } 168 }
169 169
170 while (i < sizeof(av) * 8) { 170 while (i < sizeof(av) * 8) {
171 if (perm & av) { 171 if (perm & av) {
172 for (i2 = 0; i2 < ARRA 172 for (i2 = 0; i2 < ARRAY_SIZE(av_perm_to_string); i2++) {
173 if ((av_perm_t 173 if ((av_perm_to_string[i2].tclass == tclass) &&
174 (av_perm_t 174 (av_perm_to_string[i2].value == perm))
175 break; 175 break;
176 } 176 }
177 if (i2 < ARRAY_SIZE(av 177 if (i2 < ARRAY_SIZE(av_perm_to_string)) {
178 audit_log_form 178 audit_log_format(ab, " %s",
179 179 av_perm_to_string[i2].name);
180 av &= ~perm; 180 av &= ~perm;
181 } 181 }
182 } 182 }
183 i++; 183 i++;
184 perm <<= 1; 184 perm <<= 1;
185 } 185 }
186 186
187 if (av) 187 if (av)
188 audit_log_format(ab, " 0x%x", 188 audit_log_format(ab, " 0x%x", av);
189 189
190 audit_log_format(ab, " }"); 190 audit_log_format(ab, " }");
191 } 191 }
192 192
193 /** 193 /**
194 * avc_dump_query - Display a SID pair and a c 194 * avc_dump_query - Display a SID pair and a class in human-readable form.
195 * @ssid: source security identifier 195 * @ssid: source security identifier
196 * @tsid: target security identifier 196 * @tsid: target security identifier
197 * @tclass: target security class 197 * @tclass: target security class
198 */ 198 */
199 static void avc_dump_query(struct audit_buffer 199 static void avc_dump_query(struct audit_buffer *ab, u32 ssid, u32 tsid, u16 tclass)
200 { 200 {
201 int rc; 201 int rc;
202 char *scontext; 202 char *scontext;
203 u32 scontext_len; 203 u32 scontext_len;
204 204
205 rc = security_sid_to_context(ssid, &sc 205 rc = security_sid_to_context(ssid, &scontext, &scontext_len);
206 if (rc) 206 if (rc)
207 audit_log_format(ab, "ssid=%d" 207 audit_log_format(ab, "ssid=%d", ssid);
208 else { 208 else {
209 audit_log_format(ab, "scontext 209 audit_log_format(ab, "scontext=%s", scontext);
210 kfree(scontext); 210 kfree(scontext);
211 } 211 }
212 212
213 rc = security_sid_to_context(tsid, &sc 213 rc = security_sid_to_context(tsid, &scontext, &scontext_len);
214 if (rc) 214 if (rc)
215 audit_log_format(ab, " tsid=%d 215 audit_log_format(ab, " tsid=%d", tsid);
216 else { 216 else {
217 audit_log_format(ab, " tcontex 217 audit_log_format(ab, " tcontext=%s", scontext);
218 kfree(scontext); 218 kfree(scontext);
219 } 219 }
220 220
221 BUG_ON(tclass >= ARRAY_SIZE(class_to_s 221 BUG_ON(tclass >= ARRAY_SIZE(class_to_string) || !class_to_string[tclass]);
222 audit_log_format(ab, " tclass=%s", cla 222 audit_log_format(ab, " tclass=%s", class_to_string[tclass]);
223 } 223 }
224 224
225 /** 225 /**
226 * avc_init - Initialize the AVC. 226 * avc_init - Initialize the AVC.
227 * 227 *
228 * Initialize the access vector cache. 228 * Initialize the access vector cache.
229 */ 229 */
230 void __init avc_init(void) 230 void __init avc_init(void)
231 { 231 {
232 int i; 232 int i;
233 233
234 for (i = 0; i < AVC_CACHE_SLOTS; i++) 234 for (i = 0; i < AVC_CACHE_SLOTS; i++) {
235 INIT_LIST_HEAD(&avc_cache.slot 235 INIT_LIST_HEAD(&avc_cache.slots[i]);
236 spin_lock_init(&avc_cache.slot 236 spin_lock_init(&avc_cache.slots_lock[i]);
237 } 237 }
238 atomic_set(&avc_cache.active_nodes, 0) 238 atomic_set(&avc_cache.active_nodes, 0);
239 atomic_set(&avc_cache.lru_hint, 0); 239 atomic_set(&avc_cache.lru_hint, 0);
240 240
241 avc_node_cachep = kmem_cache_create("a 241 avc_node_cachep = kmem_cache_create("avc_node", sizeof(struct avc_node),
242 0 242 0, SLAB_PANIC, NULL);
243 243
244 audit_log(current->audit_context, GFP_ 244 audit_log(current->audit_context, GFP_KERNEL, AUDIT_KERNEL, "AVC INITIALIZED\n");
245 } 245 }
246 246
247 int avc_get_hash_stats(char *page) 247 int avc_get_hash_stats(char *page)
248 { 248 {
249 int i, chain_len, max_chain_len, slots 249 int i, chain_len, max_chain_len, slots_used;
250 struct avc_node *node; 250 struct avc_node *node;
251 251
252 rcu_read_lock(); 252 rcu_read_lock();
253 253
254 slots_used = 0; 254 slots_used = 0;
255 max_chain_len = 0; 255 max_chain_len = 0;
256 for (i = 0; i < AVC_CACHE_SLOTS; i++) 256 for (i = 0; i < AVC_CACHE_SLOTS; i++) {
257 if (!list_empty(&avc_cache.slo 257 if (!list_empty(&avc_cache.slots[i])) {
258 slots_used++; 258 slots_used++;
259 chain_len = 0; 259 chain_len = 0;
260 list_for_each_entry_rc 260 list_for_each_entry_rcu(node, &avc_cache.slots[i], list)
261 chain_len++; 261 chain_len++;
262 if (chain_len > max_ch 262 if (chain_len > max_chain_len)
263 max_chain_len 263 max_chain_len = chain_len;
264 } 264 }
265 } 265 }
266 266
267 rcu_read_unlock(); 267 rcu_read_unlock();
268 268
269 return scnprintf(page, PAGE_SIZE, "ent 269 return scnprintf(page, PAGE_SIZE, "entries: %d\nbuckets used: %d/%d\n"
270 "longest chain: %d\n" 270 "longest chain: %d\n",
271 atomic_read(&avc_cach 271 atomic_read(&avc_cache.active_nodes),
272 slots_used, AVC_CACHE 272 slots_used, AVC_CACHE_SLOTS, max_chain_len);
273 } 273 }
274 274
275 static void avc_node_free(struct rcu_head *rhe 275 static void avc_node_free(struct rcu_head *rhead)
276 { 276 {
277 struct avc_node *node = container_of(r 277 struct avc_node *node = container_of(rhead, struct avc_node, rhead);
278 kmem_cache_free(avc_node_cachep, node) 278 kmem_cache_free(avc_node_cachep, node);
279 avc_cache_stats_incr(frees); 279 avc_cache_stats_incr(frees);
280 } 280 }
281 281
282 static void avc_node_delete(struct avc_node *n 282 static void avc_node_delete(struct avc_node *node)
283 { 283 {
284 list_del_rcu(&node->list); 284 list_del_rcu(&node->list);
285 call_rcu(&node->rhead, avc_node_free); 285 call_rcu(&node->rhead, avc_node_free);
286 atomic_dec(&avc_cache.active_nodes); 286 atomic_dec(&avc_cache.active_nodes);
287 } 287 }
288 288
289 static void avc_node_kill(struct avc_node *nod 289 static void avc_node_kill(struct avc_node *node)
290 { 290 {
291 kmem_cache_free(avc_node_cachep, node) 291 kmem_cache_free(avc_node_cachep, node);
292 avc_cache_stats_incr(frees); 292 avc_cache_stats_incr(frees);
293 atomic_dec(&avc_cache.active_nodes); 293 atomic_dec(&avc_cache.active_nodes);
294 } 294 }
295 295
296 static void avc_node_replace(struct avc_node * 296 static void avc_node_replace(struct avc_node *new, struct avc_node *old)
297 { 297 {
298 list_replace_rcu(&old->list, &new->lis 298 list_replace_rcu(&old->list, &new->list);
299 call_rcu(&old->rhead, avc_node_free); 299 call_rcu(&old->rhead, avc_node_free);
300 atomic_dec(&avc_cache.active_nodes); 300 atomic_dec(&avc_cache.active_nodes);
301 } 301 }
302 302
303 static inline int avc_reclaim_node(void) 303 static inline int avc_reclaim_node(void)
304 { 304 {
305 struct avc_node *node; 305 struct avc_node *node;
306 int hvalue, try, ecx; 306 int hvalue, try, ecx;
307 unsigned long flags; 307 unsigned long flags;
308 308
309 for (try = 0, ecx = 0; try < AVC_CACHE 309 for (try = 0, ecx = 0; try < AVC_CACHE_SLOTS; try++ ) {
310 hvalue = atomic_inc_return(&av 310 hvalue = atomic_inc_return(&avc_cache.lru_hint) & (AVC_CACHE_SLOTS - 1);
311 311
312 if (!spin_trylock_irqsave(&avc 312 if (!spin_trylock_irqsave(&avc_cache.slots_lock[hvalue], flags))
313 continue; 313 continue;
314 314
315 rcu_read_lock(); <<
316 list_for_each_entry(node, &avc 315 list_for_each_entry(node, &avc_cache.slots[hvalue], list) {
317 if (atomic_dec_and_tes 316 if (atomic_dec_and_test(&node->ae.used)) {
318 /* Recently Un 317 /* Recently Unused */
319 avc_node_delet 318 avc_node_delete(node);
320 avc_cache_stat 319 avc_cache_stats_incr(reclaims);
321 ecx++; 320 ecx++;
322 if (ecx >= AVC 321 if (ecx >= AVC_CACHE_RECLAIM) {
323 rcu_re <<
324 spin_u 322 spin_unlock_irqrestore(&avc_cache.slots_lock[hvalue], flags);
325 goto o 323 goto out;
326 } 324 }
327 } 325 }
328 } 326 }
329 rcu_read_unlock(); <<
330 spin_unlock_irqrestore(&avc_ca 327 spin_unlock_irqrestore(&avc_cache.slots_lock[hvalue], flags);
331 } 328 }
332 out: 329 out:
333 return ecx; 330 return ecx;
334 } 331 }
335 332
336 static struct avc_node *avc_alloc_node(void) 333 static struct avc_node *avc_alloc_node(void)
337 { 334 {
338 struct avc_node *node; 335 struct avc_node *node;
339 336
340 node = kmem_cache_zalloc(avc_node_cach 337 node = kmem_cache_zalloc(avc_node_cachep, GFP_ATOMIC);
341 if (!node) 338 if (!node)
342 goto out; 339 goto out;
343 340
344 INIT_RCU_HEAD(&node->rhead); 341 INIT_RCU_HEAD(&node->rhead);
345 INIT_LIST_HEAD(&node->list); 342 INIT_LIST_HEAD(&node->list);
346 atomic_set(&node->ae.used, 1); 343 atomic_set(&node->ae.used, 1);
347 avc_cache_stats_incr(allocations); 344 avc_cache_stats_incr(allocations);
348 345
349 if (atomic_inc_return(&avc_cache.activ 346 if (atomic_inc_return(&avc_cache.active_nodes) > avc_cache_threshold)
350 avc_reclaim_node(); 347 avc_reclaim_node();
351 348
352 out: 349 out:
353 return node; 350 return node;
354 } 351 }
355 352
356 static void avc_node_populate(struct avc_node 353 static void avc_node_populate(struct avc_node *node, u32 ssid, u32 tsid, u16 tclass, struct avc_entry *ae)
357 { 354 {
358 node->ae.ssid = ssid; 355 node->ae.ssid = ssid;
359 node->ae.tsid = tsid; 356 node->ae.tsid = tsid;
360 node->ae.tclass = tclass; 357 node->ae.tclass = tclass;
361 memcpy(&node->ae.avd, &ae->avd, sizeof 358 memcpy(&node->ae.avd, &ae->avd, sizeof(node->ae.avd));
362 } 359 }
363 360
364 static inline struct avc_node *avc_search_node 361 static inline struct avc_node *avc_search_node(u32 ssid, u32 tsid, u16 tclass)
365 { 362 {
366 struct avc_node *node, *ret = NULL; 363 struct avc_node *node, *ret = NULL;
367 int hvalue; 364 int hvalue;
368 365
369 hvalue = avc_hash(ssid, tsid, tclass); 366 hvalue = avc_hash(ssid, tsid, tclass);
370 list_for_each_entry_rcu(node, &avc_cac 367 list_for_each_entry_rcu(node, &avc_cache.slots[hvalue], list) {
371 if (ssid == node->ae.ssid && 368 if (ssid == node->ae.ssid &&
372 tclass == node->ae.tclass 369 tclass == node->ae.tclass &&
373 tsid == node->ae.tsid) { 370 tsid == node->ae.tsid) {
374 ret = node; 371 ret = node;
375 break; 372 break;
376 } 373 }
377 } 374 }
378 375
379 if (ret == NULL) { 376 if (ret == NULL) {
380 /* cache miss */ 377 /* cache miss */
381 goto out; 378 goto out;
382 } 379 }
383 380
384 /* cache hit */ 381 /* cache hit */
385 if (atomic_read(&ret->ae.used) != 1) 382 if (atomic_read(&ret->ae.used) != 1)
386 atomic_set(&ret->ae.used, 1); 383 atomic_set(&ret->ae.used, 1);
387 out: 384 out:
388 return ret; 385 return ret;
389 } 386 }
390 387
391 /** 388 /**
392 * avc_lookup - Look up an AVC entry. 389 * avc_lookup - Look up an AVC entry.
393 * @ssid: source security identifier 390 * @ssid: source security identifier
394 * @tsid: target security identifier 391 * @tsid: target security identifier
395 * @tclass: target security class 392 * @tclass: target security class
396 * @requested: requested permissions, interpre 393 * @requested: requested permissions, interpreted based on @tclass
397 * 394 *
398 * Look up an AVC entry that is valid for the 395 * Look up an AVC entry that is valid for the
399 * @requested permissions between the SID pair 396 * @requested permissions between the SID pair
400 * (@ssid, @tsid), interpreting the permission 397 * (@ssid, @tsid), interpreting the permissions
401 * based on @tclass. If a valid AVC entry exi 398 * based on @tclass. If a valid AVC entry exists,
402 * then this function return the avc_node. 399 * then this function return the avc_node.
403 * Otherwise, this function returns NULL. 400 * Otherwise, this function returns NULL.
404 */ 401 */
405 static struct avc_node *avc_lookup(u32 ssid, u 402 static struct avc_node *avc_lookup(u32 ssid, u32 tsid, u16 tclass, u32 requested)
406 { 403 {
407 struct avc_node *node; 404 struct avc_node *node;
408 405
409 avc_cache_stats_incr(lookups); 406 avc_cache_stats_incr(lookups);
410 node = avc_search_node(ssid, tsid, tcl 407 node = avc_search_node(ssid, tsid, tclass);
411 408
412 if (node && ((node->ae.avd.decided & r 409 if (node && ((node->ae.avd.decided & requested) == requested)) {
413 avc_cache_stats_incr(hits); 410 avc_cache_stats_incr(hits);
414 goto out; 411 goto out;
415 } 412 }
416 413
417 node = NULL; 414 node = NULL;
418 avc_cache_stats_incr(misses); 415 avc_cache_stats_incr(misses);
419 out: 416 out:
420 return node; 417 return node;
421 } 418 }
422 419
423 static int avc_latest_notif_update(int seqno, 420 static int avc_latest_notif_update(int seqno, int is_insert)
424 { 421 {
425 int ret = 0; 422 int ret = 0;
426 static DEFINE_SPINLOCK(notif_lock); 423 static DEFINE_SPINLOCK(notif_lock);
427 unsigned long flag; 424 unsigned long flag;
428 425
429 spin_lock_irqsave(¬if_lock, flag); 426 spin_lock_irqsave(¬if_lock, flag);
430 if (is_insert) { 427 if (is_insert) {
431 if (seqno < avc_cache.latest_n 428 if (seqno < avc_cache.latest_notif) {
432 printk(KERN_WARNING "a 429 printk(KERN_WARNING "avc: seqno %d < latest_notif %d\n",
433 seqno, avc_cach 430 seqno, avc_cache.latest_notif);
434 ret = -EAGAIN; 431 ret = -EAGAIN;
435 } 432 }
436 } else { 433 } else {
437 if (seqno > avc_cache.latest_n 434 if (seqno > avc_cache.latest_notif)
438 avc_cache.latest_notif 435 avc_cache.latest_notif = seqno;
439 } 436 }
440 spin_unlock_irqrestore(¬if_lock, fl 437 spin_unlock_irqrestore(¬if_lock, flag);
441 438
442 return ret; 439 return ret;
443 } 440 }
444 441
445 /** 442 /**
446 * avc_insert - Insert an AVC entry. 443 * avc_insert - Insert an AVC entry.
447 * @ssid: source security identifier 444 * @ssid: source security identifier
448 * @tsid: target security identifier 445 * @tsid: target security identifier
449 * @tclass: target security class 446 * @tclass: target security class
450 * @ae: AVC entry 447 * @ae: AVC entry
451 * 448 *
452 * Insert an AVC entry for the SID pair 449 * Insert an AVC entry for the SID pair
453 * (@ssid, @tsid) and class @tclass. 450 * (@ssid, @tsid) and class @tclass.
454 * The access vectors and the sequence number 451 * The access vectors and the sequence number are
455 * normally provided by the security server in 452 * normally provided by the security server in
456 * response to a security_compute_av() call. 453 * response to a security_compute_av() call. If the
457 * sequence number @ae->avd.seqno is not less 454 * sequence number @ae->avd.seqno is not less than the latest
458 * revocation notification, then the function 455 * revocation notification, then the function copies
459 * the access vectors into a cache entry, retu 456 * the access vectors into a cache entry, returns
460 * avc_node inserted. Otherwise, this function 457 * avc_node inserted. Otherwise, this function returns NULL.
461 */ 458 */
462 static struct avc_node *avc_insert(u32 ssid, u 459 static struct avc_node *avc_insert(u32 ssid, u32 tsid, u16 tclass, struct avc_entry *ae)
463 { 460 {
464 struct avc_node *pos, *node = NULL; 461 struct avc_node *pos, *node = NULL;
465 int hvalue; 462 int hvalue;
466 unsigned long flag; 463 unsigned long flag;
467 464
468 if (avc_latest_notif_update(ae->avd.se 465 if (avc_latest_notif_update(ae->avd.seqno, 1))
469 goto out; 466 goto out;
470 467
471 node = avc_alloc_node(); 468 node = avc_alloc_node();
472 if (node) { 469 if (node) {
473 hvalue = avc_hash(ssid, tsid, 470 hvalue = avc_hash(ssid, tsid, tclass);
474 avc_node_populate(node, ssid, 471 avc_node_populate(node, ssid, tsid, tclass, ae);
475 472
476 spin_lock_irqsave(&avc_cache.s 473 spin_lock_irqsave(&avc_cache.slots_lock[hvalue], flag);
477 list_for_each_entry(pos, &avc_ 474 list_for_each_entry(pos, &avc_cache.slots[hvalue], list) {
478 if (pos->ae.ssid == ss 475 if (pos->ae.ssid == ssid &&
479 pos->ae.tsid == ts 476 pos->ae.tsid == tsid &&
480 pos->ae.tclass == 477 pos->ae.tclass == tclass) {
481 avc_node_repla 478 avc_node_replace(node, pos);
482 goto found; 479 goto found;
483 } 480 }
484 } 481 }
485 list_add_rcu(&node->list, &avc 482 list_add_rcu(&node->list, &avc_cache.slots[hvalue]);
486 found: 483 found:
487 spin_unlock_irqrestore(&avc_ca 484 spin_unlock_irqrestore(&avc_cache.slots_lock[hvalue], flag);
488 } 485 }
489 out: 486 out:
490 return node; 487 return node;
491 } 488 }
492 489
493 static inline void avc_print_ipv6_addr(struct 490 static inline void avc_print_ipv6_addr(struct audit_buffer *ab,
494 struct 491 struct in6_addr *addr, __be16 port,
495 char *n 492 char *name1, char *name2)
496 { 493 {
497 if (!ipv6_addr_any(addr)) 494 if (!ipv6_addr_any(addr))
498 audit_log_format(ab, " %s=" NI 495 audit_log_format(ab, " %s=" NIP6_FMT, name1, NIP6(*addr));
499 if (port) 496 if (port)
500 audit_log_format(ab, " %s=%d", 497 audit_log_format(ab, " %s=%d", name2, ntohs(port));
501 } 498 }
502 499
503 static inline void avc_print_ipv4_addr(struct 500 static inline void avc_print_ipv4_addr(struct audit_buffer *ab, __be32 addr,
504 __be16 501 __be16 port, char *name1, char *name2)
505 { 502 {
506 if (addr) 503 if (addr)
507 audit_log_format(ab, " %s=" NI 504 audit_log_format(ab, " %s=" NIPQUAD_FMT, name1, NIPQUAD(addr));
508 if (port) 505 if (port)
509 audit_log_format(ab, " %s=%d", 506 audit_log_format(ab, " %s=%d", name2, ntohs(port));
510 } 507 }
511 508
512 /** 509 /**
513 * avc_audit - Audit the granting or denial of 510 * avc_audit - Audit the granting or denial of permissions.
514 * @ssid: source security identifier 511 * @ssid: source security identifier
515 * @tsid: target security identifier 512 * @tsid: target security identifier
516 * @tclass: target security class 513 * @tclass: target security class
517 * @requested: requested permissions 514 * @requested: requested permissions
518 * @avd: access vector decisions 515 * @avd: access vector decisions
519 * @result: result from avc_has_perm_noaudit 516 * @result: result from avc_has_perm_noaudit
520 * @a: auxiliary audit data 517 * @a: auxiliary audit data
521 * 518 *
522 * Audit the granting or denial of permissions 519 * Audit the granting or denial of permissions in accordance
523 * with the policy. This function is typicall 520 * with the policy. This function is typically called by
524 * avc_has_perm() after a permission check, bu 521 * avc_has_perm() after a permission check, but can also be
525 * called directly by callers who use avc_has_ 522 * called directly by callers who use avc_has_perm_noaudit()
526 * in order to separate the permission check f 523 * in order to separate the permission check from the auditing.
527 * For example, this separation is useful when 524 * For example, this separation is useful when the permission check must
528 * be performed under a lock, to allow the loc 525 * be performed under a lock, to allow the lock to be released
529 * before calling the auditing code. 526 * before calling the auditing code.
530 */ 527 */
531 void avc_audit(u32 ssid, u32 tsid, 528 void avc_audit(u32 ssid, u32 tsid,
532 u16 tclass, u32 requested, 529 u16 tclass, u32 requested,
533 struct av_decision *avd, int re 530 struct av_decision *avd, int result, struct avc_audit_data *a)
534 { 531 {
535 struct task_struct *tsk = current; 532 struct task_struct *tsk = current;
536 struct inode *inode = NULL; 533 struct inode *inode = NULL;
537 u32 denied, audited; 534 u32 denied, audited;
538 struct audit_buffer *ab; 535 struct audit_buffer *ab;
539 536
540 denied = requested & ~avd->allowed; 537 denied = requested & ~avd->allowed;
541 if (denied) { 538 if (denied) {
542 audited = denied; 539 audited = denied;
543 if (!(audited & avd->auditdeny 540 if (!(audited & avd->auditdeny))
544 return; 541 return;
545 } else if (result) { 542 } else if (result) {
546 audited = denied = requested; 543 audited = denied = requested;
547 } else { 544 } else {
548 audited = requested; 545 audited = requested;
549 if (!(audited & avd->auditallo 546 if (!(audited & avd->auditallow))
550 return; 547 return;
551 } 548 }
552 549
553 ab = audit_log_start(current->audit_co 550 ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_AVC);
554 if (!ab) 551 if (!ab)
555 return; /* audit_panic 552 return; /* audit_panic has been called */
556 audit_log_format(ab, "avc: %s ", deni 553 audit_log_format(ab, "avc: %s ", denied ? "denied" : "granted");
557 avc_dump_av(ab, tclass,audited); 554 avc_dump_av(ab, tclass,audited);
558 audit_log_format(ab, " for "); 555 audit_log_format(ab, " for ");
559 if (a && a->tsk) 556 if (a && a->tsk)
560 tsk = a->tsk; 557 tsk = a->tsk;
561 if (tsk && tsk->pid) { 558 if (tsk && tsk->pid) {
562 audit_log_format(ab, " pid=%d 559 audit_log_format(ab, " pid=%d comm=", tsk->pid);
563 audit_log_untrustedstring(ab, 560 audit_log_untrustedstring(ab, tsk->comm);
564 } 561 }
565 if (a) { 562 if (a) {
566 switch (a->type) { 563 switch (a->type) {
567 case AVC_AUDIT_DATA_IPC: 564 case AVC_AUDIT_DATA_IPC:
568 audit_log_format(ab, " 565 audit_log_format(ab, " key=%d", a->u.ipc_id);
569 break; 566 break;
570 case AVC_AUDIT_DATA_CAP: 567 case AVC_AUDIT_DATA_CAP:
571 audit_log_format(ab, " 568 audit_log_format(ab, " capability=%d", a->u.cap);
572 break; 569 break;
573 case AVC_AUDIT_DATA_FS: 570 case AVC_AUDIT_DATA_FS:
574 if (a->u.fs.path.dentr 571 if (a->u.fs.path.dentry) {
575 struct dentry 572 struct dentry *dentry = a->u.fs.path.dentry;
576 if (a->u.fs.pa 573 if (a->u.fs.path.mnt) {
577 audit_ 574 audit_log_d_path(ab, "path=",
578 575 &a->u.fs.path);
579 } else { 576 } else {
580 audit_ 577 audit_log_format(ab, " name=");
581 audit_ 578 audit_log_untrustedstring(ab, dentry->d_name.name);
582 } 579 }
583 inode = dentry 580 inode = dentry->d_inode;
584 } else if (a->u.fs.ino 581 } else if (a->u.fs.inode) {
585 struct dentry 582 struct dentry *dentry;
586 inode = a->u.f 583 inode = a->u.fs.inode;
587 dentry = d_fin 584 dentry = d_find_alias(inode);
588 if (dentry) { 585 if (dentry) {
589 audit_ 586 audit_log_format(ab, " name=");
590 audit_ 587 audit_log_untrustedstring(ab, dentry->d_name.name);
591 dput(d 588 dput(dentry);
592 } 589 }
593 } 590 }
594 if (inode) 591 if (inode)
595 audit_log_form 592 audit_log_format(ab, " dev=%s ino=%lu",
596 593 inode->i_sb->s_id,
597 594 inode->i_ino);
598 break; 595 break;
599 case AVC_AUDIT_DATA_NET: 596 case AVC_AUDIT_DATA_NET:
600 if (a->u.net.sk) { 597 if (a->u.net.sk) {
601 struct sock *s 598 struct sock *sk = a->u.net.sk;
602 struct unix_so 599 struct unix_sock *u;
603 int len = 0; 600 int len = 0;
604 char *p = NULL 601 char *p = NULL;
605 602
606 switch (sk->sk 603 switch (sk->sk_family) {
607 case AF_INET: 604 case AF_INET: {
608 struct 605 struct inet_sock *inet = inet_sk(sk);
609 606
610 avc_pr 607 avc_print_ipv4_addr(ab, inet->rcv_saddr,
611 608 inet->sport,
612 609 "laddr", "lport");
613 avc_pr 610 avc_print_ipv4_addr(ab, inet->daddr,
614 611 inet->dport,
615 612 "faddr", "fport");
616 break; 613 break;
617 } 614 }
618 case AF_INET6: 615 case AF_INET6: {
619 struct 616 struct inet_sock *inet = inet_sk(sk);
620 struct 617 struct ipv6_pinfo *inet6 = inet6_sk(sk);
621 618
622 avc_pr 619 avc_print_ipv6_addr(ab, &inet6->rcv_saddr,
623 620 inet->sport,
624 621 "laddr", "lport");
625 avc_pr 622 avc_print_ipv6_addr(ab, &inet6->daddr,
626 623 inet->dport,
627 624 "faddr", "fport");
628 break; 625 break;
629 } 626 }
630 case AF_UNIX: 627 case AF_UNIX:
631 u = un 628 u = unix_sk(sk);
632 if (u- 629 if (u->dentry) {
633 630 struct path path = {
634 631 .dentry = u->dentry,
635 632 .mnt = u->mnt
636 633 };
637 634 audit_log_d_path(ab, "path=",
638 635 &path);
639 636 break;
640 } 637 }
641 if (!u 638 if (!u->addr)
642 639 break;
643 len = 640 len = u->addr->len-sizeof(short);
644 p = &u 641 p = &u->addr->name->sun_path[0];
645 audit_ 642 audit_log_format(ab, " path=");
646 if (*p 643 if (*p)
647 644 audit_log_untrustedstring(ab, p);
648 else 645 else
649 646 audit_log_hex(ab, p, len);
650 break; 647 break;
651 } 648 }
652 } 649 }
653 650
654 switch (a->u.net.famil 651 switch (a->u.net.family) {
655 case AF_INET: 652 case AF_INET:
656 avc_print_ipv4 653 avc_print_ipv4_addr(ab, a->u.net.v4info.saddr,
657 654 a->u.net.sport,
658 655 "saddr", "src");
659 avc_print_ipv4 656 avc_print_ipv4_addr(ab, a->u.net.v4info.daddr,
660 657 a->u.net.dport,
661 658 "daddr", "dest");
662 break; 659 break;
663 case AF_INET6: 660 case AF_INET6:
664 avc_print_ipv6 661 avc_print_ipv6_addr(ab, &a->u.net.v6info.saddr,
665 662 a->u.net.sport,
666 663 "saddr", "src");
667 avc_print_ipv6 664 avc_print_ipv6_addr(ab, &a->u.net.v6info.daddr,
668 665 a->u.net.dport,
669 666 "daddr", "dest");
670 break; 667 break;
671 } 668 }
672 if (a->u.net.netif > 0 669 if (a->u.net.netif > 0) {
673 struct net_dev 670 struct net_device *dev;
674 671
675 /* NOTE: we al 672 /* NOTE: we always use init's namespace */
676 dev = dev_get_ 673 dev = dev_get_by_index(&init_net,
677 674 a->u.net.netif);
678 if (dev) { 675 if (dev) {
679 audit_ 676 audit_log_format(ab, " netif=%s",
680 677 dev->name);
681 dev_pu 678 dev_put(dev);
682 } 679 }
683 } 680 }
684 break; 681 break;
685 } 682 }
686 } 683 }
687 audit_log_format(ab, " "); 684 audit_log_format(ab, " ");
688 avc_dump_query(ab, ssid, tsid, tclass) 685 avc_dump_query(ab, ssid, tsid, tclass);
689 audit_log_end(ab); 686 audit_log_end(ab);
690 } 687 }
691 688
692 /** 689 /**
693 * avc_add_callback - Register a callback for 690 * avc_add_callback - Register a callback for security events.
694 * @callback: callback function 691 * @callback: callback function
695 * @events: security events 692 * @events: security events
696 * @ssid: source security identifier or %SECSI 693 * @ssid: source security identifier or %SECSID_WILD
697 * @tsid: target security identifier or %SECSI 694 * @tsid: target security identifier or %SECSID_WILD
698 * @tclass: target security class 695 * @tclass: target security class
699 * @perms: permissions 696 * @perms: permissions
700 * 697 *
701 * Register a callback function for events in 698 * Register a callback function for events in the set @events
702 * related to the SID pair (@ssid, @tsid) and 699 * related to the SID pair (@ssid, @tsid) and
703 * and the permissions @perms, interpreting 700 * and the permissions @perms, interpreting
704 * @perms based on @tclass. Returns %0 on suc 701 * @perms based on @tclass. Returns %0 on success or
705 * -%ENOMEM if insufficient memory exists to a 702 * -%ENOMEM if insufficient memory exists to add the callback.
706 */ 703 */
707 int avc_add_callback(int (*callback)(u32 event 704 int avc_add_callback(int (*callback)(u32 event, u32 ssid, u32 tsid,
708 u16 tclas 705 u16 tclass, u32 perms,
709 u32 *out_ 706 u32 *out_retained),
710 u32 events, u32 ssid, u32 707 u32 events, u32 ssid, u32 tsid,
711 u16 tclass, u32 perms) 708 u16 tclass, u32 perms)
712 { 709 {
713 struct avc_callback_node *c; 710 struct avc_callback_node *c;
714 int rc = 0; 711 int rc = 0;
715 712
716 c = kmalloc(sizeof(*c), GFP_ATOMIC); 713 c = kmalloc(sizeof(*c), GFP_ATOMIC);
717 if (!c) { 714 if (!c) {
718 rc = -ENOMEM; 715 rc = -ENOMEM;
719 goto out; 716 goto out;
720 } 717 }
721 718
722 c->callback = callback; 719 c->callback = callback;
723 c->events = events; 720 c->events = events;
724 c->ssid = ssid; 721 c->ssid = ssid;
725 c->tsid = tsid; 722 c->tsid = tsid;
726 c->perms = perms; 723 c->perms = perms;
727 c->next = avc_callbacks; 724 c->next = avc_callbacks;
728 avc_callbacks = c; 725 avc_callbacks = c;
729 out: 726 out:
730 return rc; 727 return rc;
731 } 728 }
732 729
733 static inline int avc_sidcmp(u32 x, u32 y) 730 static inline int avc_sidcmp(u32 x, u32 y)
734 { 731 {
735 return (x == y || x == SECSID_WILD || 732 return (x == y || x == SECSID_WILD || y == SECSID_WILD);
736 } 733 }
737 734
738 /** 735 /**
739 * avc_update_node Update an AVC entry 736 * avc_update_node Update an AVC entry
740 * @event : Updating event 737 * @event : Updating event
741 * @perms : Permission mask bits 738 * @perms : Permission mask bits
742 * @ssid,@tsid,@tclass : identifier of an AVC 739 * @ssid,@tsid,@tclass : identifier of an AVC entry
743 * 740 *
744 * if a valid AVC entry doesn't exist,this fun 741 * if a valid AVC entry doesn't exist,this function returns -ENOENT.
745 * if kmalloc() called internal returns NULL, 742 * if kmalloc() called internal returns NULL, this function returns -ENOMEM.
746 * otherwise, this function update the AVC ent 743 * otherwise, this function update the AVC entry. The original AVC-entry object
747 * will release later by RCU. 744 * will release later by RCU.
748 */ 745 */
749 static int avc_update_node(u32 event, u32 perm 746 static int avc_update_node(u32 event, u32 perms, u32 ssid, u32 tsid, u16 tclass)
750 { 747 {
751 int hvalue, rc = 0; 748 int hvalue, rc = 0;
752 unsigned long flag; 749 unsigned long flag;
753 struct avc_node *pos, *node, *orig = N 750 struct avc_node *pos, *node, *orig = NULL;
754 751
755 node = avc_alloc_node(); 752 node = avc_alloc_node();
756 if (!node) { 753 if (!node) {
757 rc = -ENOMEM; 754 rc = -ENOMEM;
758 goto out; 755 goto out;
759 } 756 }
760 757
761 /* Lock the target slot */ 758 /* Lock the target slot */
762 hvalue = avc_hash(ssid, tsid, tclass); 759 hvalue = avc_hash(ssid, tsid, tclass);
763 spin_lock_irqsave(&avc_cache.slots_loc 760 spin_lock_irqsave(&avc_cache.slots_lock[hvalue], flag);
764 761
765 list_for_each_entry(pos, &avc_cache.sl 762 list_for_each_entry(pos, &avc_cache.slots[hvalue], list){
766 if ( ssid==pos->ae.ssid && 763 if ( ssid==pos->ae.ssid &&
767 tsid==pos->ae.tsid && 764 tsid==pos->ae.tsid &&
768 tclass==pos->ae.tclass ){ 765 tclass==pos->ae.tclass ){
769 orig = pos; 766 orig = pos;
770 break; 767 break;
771 } 768 }
772 } 769 }
773 770
774 if (!orig) { 771 if (!orig) {
775 rc = -ENOENT; 772 rc = -ENOENT;
776 avc_node_kill(node); 773 avc_node_kill(node);
777 goto out_unlock; 774 goto out_unlock;
778 } 775 }
779 776
780 /* 777 /*
781 * Copy and replace original node. 778 * Copy and replace original node.
782 */ 779 */
783 780
784 avc_node_populate(node, ssid, tsid, tc 781 avc_node_populate(node, ssid, tsid, tclass, &orig->ae);
785 782
786 switch (event) { 783 switch (event) {
787 case AVC_CALLBACK_GRANT: 784 case AVC_CALLBACK_GRANT:
788 node->ae.avd.allowed |= perms; 785 node->ae.avd.allowed |= perms;
789 break; 786 break;
790 case AVC_CALLBACK_TRY_REVOKE: 787 case AVC_CALLBACK_TRY_REVOKE:
791 case AVC_CALLBACK_REVOKE: 788 case AVC_CALLBACK_REVOKE:
792 node->ae.avd.allowed &= ~perms 789 node->ae.avd.allowed &= ~perms;
793 break; 790 break;
794 case AVC_CALLBACK_AUDITALLOW_ENABLE: 791 case AVC_CALLBACK_AUDITALLOW_ENABLE:
795 node->ae.avd.auditallow |= per 792 node->ae.avd.auditallow |= perms;
796 break; 793 break;
797 case AVC_CALLBACK_AUDITALLOW_DISABLE: 794 case AVC_CALLBACK_AUDITALLOW_DISABLE:
798 node->ae.avd.auditallow &= ~pe 795 node->ae.avd.auditallow &= ~perms;
799 break; 796 break;
800 case AVC_CALLBACK_AUDITDENY_ENABLE: 797 case AVC_CALLBACK_AUDITDENY_ENABLE:
801 node->ae.avd.auditdeny |= perm 798 node->ae.avd.auditdeny |= perms;
802 break; 799 break;
803 case AVC_CALLBACK_AUDITDENY_DISABLE: 800 case AVC_CALLBACK_AUDITDENY_DISABLE:
804 node->ae.avd.auditdeny &= ~per 801 node->ae.avd.auditdeny &= ~perms;
805 break; 802 break;
806 } 803 }
807 avc_node_replace(node, orig); 804 avc_node_replace(node, orig);
808 out_unlock: 805 out_unlock:
809 spin_unlock_irqrestore(&avc_cache.slot 806 spin_unlock_irqrestore(&avc_cache.slots_lock[hvalue], flag);
810 out: 807 out:
811 return rc; 808 return rc;
812 } 809 }
813 810
814 /** 811 /**
815 * avc_ss_reset - Flush the cache and revalida 812 * avc_ss_reset - Flush the cache and revalidate migrated permissions.
816 * @seqno: policy sequence number 813 * @seqno: policy sequence number
817 */ 814 */
818 int avc_ss_reset(u32 seqno) 815 int avc_ss_reset(u32 seqno)
819 { 816 {
820 struct avc_callback_node *c; 817 struct avc_callback_node *c;
821 int i, rc = 0, tmprc; 818 int i, rc = 0, tmprc;
822 unsigned long flag; 819 unsigned long flag;
823 struct avc_node *node; 820 struct avc_node *node;
824 821
825 for (i = 0; i < AVC_CACHE_SLOTS; i++) 822 for (i = 0; i < AVC_CACHE_SLOTS; i++) {
826 spin_lock_irqsave(&avc_cache.s 823 spin_lock_irqsave(&avc_cache.slots_lock[i], flag);
827 /* <<
828 * On -rt the outer spinlock d <<
829 * from being performed: <<
830 */ <<
831 rcu_read_lock(); <<
832 list_for_each_entry(node, &avc 824 list_for_each_entry(node, &avc_cache.slots[i], list)
833 avc_node_delete(node); 825 avc_node_delete(node);
834 rcu_read_unlock(); <<
835 spin_unlock_irqrestore(&avc_ca 826 spin_unlock_irqrestore(&avc_cache.slots_lock[i], flag);
836 } 827 }
837 828
838 for (c = avc_callbacks; c; c = c->next 829 for (c = avc_callbacks; c; c = c->next) {
839 if (c->events & AVC_CALLBACK_R 830 if (c->events & AVC_CALLBACK_RESET) {
840 tmprc = c->callback(AV 831 tmprc = c->callback(AVC_CALLBACK_RESET,
841 0, 832 0, 0, 0, 0, NULL);
842 /* save the first erro 833 /* save the first error encountered for the return
843 value and continue 834 value and continue processing the callbacks */
844 if (!rc) 835 if (!rc)
845 rc = tmprc; 836 rc = tmprc;
846 } 837 }
847 } 838 }
848 839
849 avc_latest_notif_update(seqno, 0); 840 avc_latest_notif_update(seqno, 0);
850 return rc; 841 return rc;
851 } 842 }
852 843
853 /** 844 /**
854 * avc_has_perm_noaudit - Check permissions bu 845 * avc_has_perm_noaudit - Check permissions but perform no auditing.
855 * @ssid: source security identifier 846 * @ssid: source security identifier
856 * @tsid: target security identifier 847 * @tsid: target security identifier
857 * @tclass: target security class 848 * @tclass: target security class
858 * @requested: requested permissions, interpre 849 * @requested: requested permissions, interpreted based on @tclass
859 * @flags: AVC_STRICT or 0 850 * @flags: AVC_STRICT or 0
860 * @avd: access vector decisions 851 * @avd: access vector decisions
861 * 852 *
862 * Check the AVC to determine whether the @req 853 * Check the AVC to determine whether the @requested permissions are granted
863 * for the SID pair (@ssid, @tsid), interpreti 854 * for the SID pair (@ssid, @tsid), interpreting the permissions
864 * based on @tclass, and call the security ser 855 * based on @tclass, and call the security server on a cache miss to obtain
865 * a new decision and add it to the cache. Re 856 * a new decision and add it to the cache. Return a copy of the decisions
866 * in @avd. Return %0 if all @requested permi 857 * in @avd. Return %0 if all @requested permissions are granted,
867 * -%EACCES if any permissions are denied, or 858 * -%EACCES if any permissions are denied, or another -errno upon
868 * other errors. This function is typically c 859 * other errors. This function is typically called by avc_has_perm(),
869 * but may also be called directly to separate 860 * but may also be called directly to separate permission checking from
870 * auditing, e.g. in cases where a lock must b 861 * auditing, e.g. in cases where a lock must be held for the check but
871 * should be released for the auditing. 862 * should be released for the auditing.
872 */ 863 */
873 int avc_has_perm_noaudit(u32 ssid, u32 tsid, 864 int avc_has_perm_noaudit(u32 ssid, u32 tsid,
874 u16 tclass, u32 reque 865 u16 tclass, u32 requested,
875 unsigned flags, 866 unsigned flags,
876 struct av_decision *a 867 struct av_decision *avd)
877 { 868 {
878 struct avc_node *node; 869 struct avc_node *node;
879 struct avc_entry entry, *p_ae; 870 struct avc_entry entry, *p_ae;
880 int rc = 0; 871 int rc = 0;
881 u32 denied; 872 u32 denied;
882 873
883 rcu_read_lock(); 874 rcu_read_lock();
884 875
885 node = avc_lookup(ssid, tsid, tclass, 876 node = avc_lookup(ssid, tsid, tclass, requested);
886 if (!node) { 877 if (!node) {
887 rcu_read_unlock(); 878 rcu_read_unlock();
888 rc = security_compute_av(ssid, 879 rc = security_compute_av(ssid,tsid,tclass,requested,&entry.avd);
889 if (rc) 880 if (rc)
890 goto out; 881 goto out;
891 rcu_read_lock(); 882 rcu_read_lock();
892 node = avc_insert(ssid,tsid,tc 883 node = avc_insert(ssid,tsid,tclass,&entry);
893 } 884 }
894 885
895 p_ae = node ? &node->ae : &entry; 886 p_ae = node ? &node->ae : &entry;
896 887
897 if (avd) 888 if (avd)
898 memcpy(avd, &p_ae->avd, sizeof 889 memcpy(avd, &p_ae->avd, sizeof(*avd));
899 890
900 denied = requested & ~(p_ae->avd.allow 891 denied = requested & ~(p_ae->avd.allowed);
901 892
902 if (!requested || denied) { 893 if (!requested || denied) {
903 if (selinux_enforcing || (flag 894 if (selinux_enforcing || (flags & AVC_STRICT))
904 rc = -EACCES; 895 rc = -EACCES;
905 else 896 else
906 if (node) 897 if (node)
907 avc_update_nod 898 avc_update_node(AVC_CALLBACK_GRANT,requested,
908 899 ssid,tsid,tclass);
909 } 900 }
910 901
911 rcu_read_unlock(); 902 rcu_read_unlock();
912 out: 903 out:
913 return rc; 904 return rc;
914 } 905 }
915 906
916 /** 907 /**
917 * avc_has_perm - Check permissions and perfor 908 * avc_has_perm - Check permissions and perform any appropriate auditing.
918 * @ssid: source security identifier 909 * @ssid: source security identifier
919 * @tsid: target security identifier 910 * @tsid: target security identifier
920 * @tclass: target security class 911 * @tclass: target security class
921 * @requested: requested permissions, interpre 912 * @requested: requested permissions, interpreted based on @tclass
922 * @auditdata: auxiliary audit data 913 * @auditdata: auxiliary audit data
923 * 914 *
924 * Check the AVC to determine whether the @req 915 * Check the AVC to determine whether the @requested permissions are granted
925 * for the SID pair (@ssid, @tsid), interpreti 916 * for the SID pair (@ssid, @tsid), interpreting the permissions
926 * based on @tclass, and call the security ser 917 * based on @tclass, and call the security server on a cache miss to obtain
927 * a new decision and add it to the cache. Au 918 * a new decision and add it to the cache. Audit the granting or denial of
928 * permissions in accordance with the policy. 919 * permissions in accordance with the policy. Return %0 if all @requested
929 * permissions are granted, -%EACCES if any pe 920 * permissions are granted, -%EACCES if any permissions are denied, or
930 * another -errno upon other errors. 921 * another -errno upon other errors.
931 */ 922 */
932 int avc_has_perm(u32 ssid, u32 tsid, u16 tclas 923 int avc_has_perm(u32 ssid, u32 tsid, u16 tclass,
933 u32 requested, struct avc_aud 924 u32 requested, struct avc_audit_data *auditdata)
934 { 925 {
935 struct av_decision avd; 926 struct av_decision avd;
936 int rc; 927 int rc;
937 928
938 rc = avc_has_perm_noaudit(ssid, tsid, 929 rc = avc_has_perm_noaudit(ssid, tsid, tclass, requested, 0, &avd);
939 avc_audit(ssid, tsid, tclass, requeste 930 avc_audit(ssid, tsid, tclass, requested, &avd, rc, auditdata);
940 return rc; 931 return rc;
941 } 932 }
942 933
943 u32 avc_policy_seqno(void) 934 u32 avc_policy_seqno(void)
944 { 935 {
945 return avc_cache.latest_notif; 936 return avc_cache.latest_notif;
946 } 937 }
947 938
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