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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
>> 36 {
>> 37 u16 tclass;
>> 38 u32 value;
>> 39 const char *name;
>> 40 } av_perm_to_string[] = {
36 #define S_(c, v, s) { c, v, s }, 41 #define S_(c, v, s) { c, v, s },
37 #include "av_perm_to_string.h" 42 #include "av_perm_to_string.h"
38 #undef S_ 43 #undef S_
39 }; 44 };
40 45
>> 46 #ifdef CONFIG_AUDIT
41 static const char *class_to_string[] = { 47 static const char *class_to_string[] = {
42 #define S_(s) s, 48 #define S_(s) s,
43 #include "class_to_string.h" 49 #include "class_to_string.h"
44 #undef S_ 50 #undef S_
45 }; 51 };
>> 52 #endif
46 53
47 #define TB_(s) static const char * s [] = { 54 #define TB_(s) static const char * s [] = {
48 #define TE_(s) }; 55 #define TE_(s) };
49 #define S_(s) s, 56 #define S_(s) s,
50 #include "common_perm_to_string.h" 57 #include "common_perm_to_string.h"
51 #undef TB_ 58 #undef TB_
52 #undef TE_ 59 #undef TE_
53 #undef S_ 60 #undef S_
54 61
55 static const struct av_inherit av_inherit[] = !! 62 static const struct av_inherit
>> 63 {
>> 64 u16 tclass;
>> 65 const char **common_pts;
>> 66 u32 common_base;
>> 67 } av_inherit[] = {
56 #define S_(c, i, b) { c, common_##i##_perm_to_ 68 #define S_(c, i, b) { c, common_##i##_perm_to_string, b },
57 #include "av_inherit.h" 69 #include "av_inherit.h"
58 #undef S_ 70 #undef S_
59 }; 71 };
60 72
61 const struct selinux_class_perm selinux_class_ <<
62 av_perm_to_string, <<
63 ARRAY_SIZE(av_perm_to_string), <<
64 class_to_string, <<
65 ARRAY_SIZE(class_to_string), <<
66 av_inherit, <<
67 ARRAY_SIZE(av_inherit) <<
68 }; <<
69 <<
70 #define AVC_CACHE_SLOTS 512 73 #define AVC_CACHE_SLOTS 512
71 #define AVC_DEF_CACHE_THRESHOLD 512 74 #define AVC_DEF_CACHE_THRESHOLD 512
72 #define AVC_CACHE_RECLAIM 16 75 #define AVC_CACHE_RECLAIM 16
73 76
74 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS 77 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
75 #define avc_cache_stats_incr(field) 78 #define avc_cache_stats_incr(field) \
76 do { 79 do { \
77 per_cpu(avc_cache_stats, get_cpu()).fi 80 per_cpu(avc_cache_stats, get_cpu()).field++; \
78 put_cpu(); 81 put_cpu(); \
79 } while (0) 82 } while (0)
80 #else 83 #else
81 #define avc_cache_stats_incr(field) do {} 84 #define avc_cache_stats_incr(field) do {} while (0)
82 #endif 85 #endif
83 86
84 struct avc_entry { 87 struct avc_entry {
85 u32 ssid; 88 u32 ssid;
86 u32 tsid; 89 u32 tsid;
87 u16 tclass; 90 u16 tclass;
88 struct av_decision avd; 91 struct av_decision avd;
89 atomic_t used; /* use 92 atomic_t used; /* used recently */
90 }; 93 };
91 94
92 struct avc_node { 95 struct avc_node {
93 struct avc_entry ae; 96 struct avc_entry ae;
94 struct list_head list; 97 struct list_head list;
95 struct rcu_head rhead; 98 struct rcu_head rhead;
96 }; 99 };
97 100
98 struct avc_cache { 101 struct avc_cache {
99 struct list_head slots[AVC_CACH 102 struct list_head slots[AVC_CACHE_SLOTS];
100 spinlock_t slots_lock[AVC 103 spinlock_t slots_lock[AVC_CACHE_SLOTS]; /* lock for writes */
101 atomic_t lru_hint; 104 atomic_t lru_hint; /* LRU hint for reclaim scan */
102 atomic_t active_nodes; 105 atomic_t active_nodes;
103 u32 latest_notif; 106 u32 latest_notif; /* latest revocation notification */
104 }; 107 };
105 108
106 struct avc_callback_node { 109 struct avc_callback_node {
107 int (*callback) (u32 event, u32 ssid, 110 int (*callback) (u32 event, u32 ssid, u32 tsid,
108 u16 tclass, u32 perms 111 u16 tclass, u32 perms,
109 u32 *out_retained); 112 u32 *out_retained);
110 u32 events; 113 u32 events;
111 u32 ssid; 114 u32 ssid;
112 u32 tsid; 115 u32 tsid;
113 u16 tclass; 116 u16 tclass;
114 u32 perms; 117 u32 perms;
115 struct avc_callback_node *next; 118 struct avc_callback_node *next;
116 }; 119 };
117 120
118 /* Exported via selinufs */ 121 /* Exported via selinufs */
119 unsigned int avc_cache_threshold = AVC_DEF_CAC 122 unsigned int avc_cache_threshold = AVC_DEF_CACHE_THRESHOLD;
120 123
121 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS 124 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
122 DEFINE_PER_CPU(struct avc_cache_stats, avc_cac 125 DEFINE_PER_CPU(struct avc_cache_stats, avc_cache_stats) = { 0 };
123 #endif 126 #endif
124 127
125 static struct avc_cache avc_cache; 128 static struct avc_cache avc_cache;
126 static struct avc_callback_node *avc_callbacks 129 static struct avc_callback_node *avc_callbacks;
127 static struct kmem_cache *avc_node_cachep; !! 130 static kmem_cache_t *avc_node_cachep;
128 131
129 static inline int avc_hash(u32 ssid, u32 tsid, 132 static inline int avc_hash(u32 ssid, u32 tsid, u16 tclass)
130 { 133 {
131 return (ssid ^ (tsid<<2) ^ (tclass<<4) 134 return (ssid ^ (tsid<<2) ^ (tclass<<4)) & (AVC_CACHE_SLOTS - 1);
132 } 135 }
133 136
134 /** 137 /**
135 * avc_dump_av - Display an access vector in h 138 * avc_dump_av - Display an access vector in human-readable form.
136 * @tclass: target security class 139 * @tclass: target security class
137 * @av: access vector 140 * @av: access vector
138 */ 141 */
139 static void avc_dump_av(struct audit_buffer *a !! 142 void avc_dump_av(struct audit_buffer *ab, u16 tclass, u32 av)
140 { 143 {
141 const char **common_pts = NULL; 144 const char **common_pts = NULL;
142 u32 common_base = 0; 145 u32 common_base = 0;
143 int i, i2, perm; 146 int i, i2, perm;
144 147
145 if (av == 0) { 148 if (av == 0) {
146 audit_log_format(ab, " null"); 149 audit_log_format(ab, " null");
147 return; 150 return;
148 } 151 }
149 152
150 for (i = 0; i < ARRAY_SIZE(av_inherit) 153 for (i = 0; i < ARRAY_SIZE(av_inherit); i++) {
151 if (av_inherit[i].tclass == tc 154 if (av_inherit[i].tclass == tclass) {
152 common_pts = av_inheri 155 common_pts = av_inherit[i].common_pts;
153 common_base = av_inher 156 common_base = av_inherit[i].common_base;
154 break; 157 break;
155 } 158 }
156 } 159 }
157 160
158 audit_log_format(ab, " {"); 161 audit_log_format(ab, " {");
159 i = 0; 162 i = 0;
160 perm = 1; 163 perm = 1;
161 while (perm < common_base) { 164 while (perm < common_base) {
162 if (perm & av) { 165 if (perm & av) {
163 audit_log_format(ab, " 166 audit_log_format(ab, " %s", common_pts[i]);
164 av &= ~perm; 167 av &= ~perm;
165 } 168 }
166 i++; 169 i++;
167 perm <<= 1; 170 perm <<= 1;
168 } 171 }
169 172
170 while (i < sizeof(av) * 8) { 173 while (i < sizeof(av) * 8) {
171 if (perm & av) { 174 if (perm & av) {
172 for (i2 = 0; i2 < ARRA 175 for (i2 = 0; i2 < ARRAY_SIZE(av_perm_to_string); i2++) {
173 if ((av_perm_t 176 if ((av_perm_to_string[i2].tclass == tclass) &&
174 (av_perm_t 177 (av_perm_to_string[i2].value == perm))
175 break; 178 break;
176 } 179 }
177 if (i2 < ARRAY_SIZE(av 180 if (i2 < ARRAY_SIZE(av_perm_to_string)) {
178 audit_log_form 181 audit_log_format(ab, " %s",
179 182 av_perm_to_string[i2].name);
180 av &= ~perm; 183 av &= ~perm;
181 } 184 }
182 } 185 }
183 i++; 186 i++;
184 perm <<= 1; 187 perm <<= 1;
185 } 188 }
186 189
187 if (av) 190 if (av)
188 audit_log_format(ab, " 0x%x", 191 audit_log_format(ab, " 0x%x", av);
189 192
190 audit_log_format(ab, " }"); 193 audit_log_format(ab, " }");
191 } 194 }
192 195
193 /** 196 /**
194 * avc_dump_query - Display a SID pair and a c 197 * avc_dump_query - Display a SID pair and a class in human-readable form.
195 * @ssid: source security identifier 198 * @ssid: source security identifier
196 * @tsid: target security identifier 199 * @tsid: target security identifier
197 * @tclass: target security class 200 * @tclass: target security class
198 */ 201 */
199 static void avc_dump_query(struct audit_buffer !! 202 void avc_dump_query(struct audit_buffer *ab, u32 ssid, u32 tsid, u16 tclass)
200 { 203 {
201 int rc; 204 int rc;
202 char *scontext; 205 char *scontext;
203 u32 scontext_len; 206 u32 scontext_len;
204 207
205 rc = security_sid_to_context(ssid, &sc 208 rc = security_sid_to_context(ssid, &scontext, &scontext_len);
206 if (rc) 209 if (rc)
207 audit_log_format(ab, "ssid=%d" 210 audit_log_format(ab, "ssid=%d", ssid);
208 else { 211 else {
209 audit_log_format(ab, "scontext 212 audit_log_format(ab, "scontext=%s", scontext);
210 kfree(scontext); 213 kfree(scontext);
211 } 214 }
212 215
213 rc = security_sid_to_context(tsid, &sc 216 rc = security_sid_to_context(tsid, &scontext, &scontext_len);
214 if (rc) 217 if (rc)
215 audit_log_format(ab, " tsid=%d 218 audit_log_format(ab, " tsid=%d", tsid);
216 else { 219 else {
217 audit_log_format(ab, " tcontex 220 audit_log_format(ab, " tcontext=%s", scontext);
218 kfree(scontext); 221 kfree(scontext);
219 } 222 }
220 <<
221 BUG_ON(tclass >= ARRAY_SIZE(class_to_s <<
222 audit_log_format(ab, " tclass=%s", cla 223 audit_log_format(ab, " tclass=%s", class_to_string[tclass]);
223 } 224 }
224 225
225 /** 226 /**
226 * avc_init - Initialize the AVC. 227 * avc_init - Initialize the AVC.
227 * 228 *
228 * Initialize the access vector cache. 229 * Initialize the access vector cache.
229 */ 230 */
230 void __init avc_init(void) 231 void __init avc_init(void)
231 { 232 {
232 int i; 233 int i;
233 234
234 for (i = 0; i < AVC_CACHE_SLOTS; i++) 235 for (i = 0; i < AVC_CACHE_SLOTS; i++) {
235 INIT_LIST_HEAD(&avc_cache.slot 236 INIT_LIST_HEAD(&avc_cache.slots[i]);
236 spin_lock_init(&avc_cache.slot 237 spin_lock_init(&avc_cache.slots_lock[i]);
237 } 238 }
238 atomic_set(&avc_cache.active_nodes, 0) 239 atomic_set(&avc_cache.active_nodes, 0);
239 atomic_set(&avc_cache.lru_hint, 0); 240 atomic_set(&avc_cache.lru_hint, 0);
240 241
241 avc_node_cachep = kmem_cache_create("a 242 avc_node_cachep = kmem_cache_create("avc_node", sizeof(struct avc_node),
242 0 !! 243 0, SLAB_PANIC, NULL, NULL);
243 244
244 audit_log(current->audit_context, GFP_ !! 245 audit_log(current->audit_context, "AVC INITIALIZED\n");
245 } 246 }
246 247
247 int avc_get_hash_stats(char *page) 248 int avc_get_hash_stats(char *page)
248 { 249 {
249 int i, chain_len, max_chain_len, slots 250 int i, chain_len, max_chain_len, slots_used;
250 struct avc_node *node; 251 struct avc_node *node;
251 252
252 rcu_read_lock(); 253 rcu_read_lock();
253 254
254 slots_used = 0; 255 slots_used = 0;
255 max_chain_len = 0; 256 max_chain_len = 0;
256 for (i = 0; i < AVC_CACHE_SLOTS; i++) 257 for (i = 0; i < AVC_CACHE_SLOTS; i++) {
257 if (!list_empty(&avc_cache.slo 258 if (!list_empty(&avc_cache.slots[i])) {
258 slots_used++; 259 slots_used++;
259 chain_len = 0; 260 chain_len = 0;
260 list_for_each_entry_rc 261 list_for_each_entry_rcu(node, &avc_cache.slots[i], list)
261 chain_len++; 262 chain_len++;
262 if (chain_len > max_ch 263 if (chain_len > max_chain_len)
263 max_chain_len 264 max_chain_len = chain_len;
264 } 265 }
265 } 266 }
266 267
267 rcu_read_unlock(); 268 rcu_read_unlock();
268 269
269 return scnprintf(page, PAGE_SIZE, "ent 270 return scnprintf(page, PAGE_SIZE, "entries: %d\nbuckets used: %d/%d\n"
270 "longest chain: %d\n" 271 "longest chain: %d\n",
271 atomic_read(&avc_cach 272 atomic_read(&avc_cache.active_nodes),
272 slots_used, AVC_CACHE 273 slots_used, AVC_CACHE_SLOTS, max_chain_len);
273 } 274 }
274 275
275 static void avc_node_free(struct rcu_head *rhe 276 static void avc_node_free(struct rcu_head *rhead)
276 { 277 {
277 struct avc_node *node = container_of(r 278 struct avc_node *node = container_of(rhead, struct avc_node, rhead);
278 kmem_cache_free(avc_node_cachep, node) 279 kmem_cache_free(avc_node_cachep, node);
279 avc_cache_stats_incr(frees); 280 avc_cache_stats_incr(frees);
280 } 281 }
281 282
282 static void avc_node_delete(struct avc_node *n 283 static void avc_node_delete(struct avc_node *node)
283 { 284 {
284 list_del_rcu(&node->list); 285 list_del_rcu(&node->list);
285 call_rcu(&node->rhead, avc_node_free); 286 call_rcu(&node->rhead, avc_node_free);
286 atomic_dec(&avc_cache.active_nodes); 287 atomic_dec(&avc_cache.active_nodes);
287 } 288 }
288 289
289 static void avc_node_kill(struct avc_node *nod 290 static void avc_node_kill(struct avc_node *node)
290 { 291 {
291 kmem_cache_free(avc_node_cachep, node) 292 kmem_cache_free(avc_node_cachep, node);
292 avc_cache_stats_incr(frees); 293 avc_cache_stats_incr(frees);
293 atomic_dec(&avc_cache.active_nodes); 294 atomic_dec(&avc_cache.active_nodes);
294 } 295 }
295 296
296 static void avc_node_replace(struct avc_node * 297 static void avc_node_replace(struct avc_node *new, struct avc_node *old)
297 { 298 {
298 list_replace_rcu(&old->list, &new->lis 299 list_replace_rcu(&old->list, &new->list);
299 call_rcu(&old->rhead, avc_node_free); 300 call_rcu(&old->rhead, avc_node_free);
300 atomic_dec(&avc_cache.active_nodes); 301 atomic_dec(&avc_cache.active_nodes);
301 } 302 }
302 303
303 static inline int avc_reclaim_node(void) 304 static inline int avc_reclaim_node(void)
304 { 305 {
305 struct avc_node *node; 306 struct avc_node *node;
306 int hvalue, try, ecx; 307 int hvalue, try, ecx;
307 unsigned long flags; 308 unsigned long flags;
308 309
309 for (try = 0, ecx = 0; try < AVC_CACHE 310 for (try = 0, ecx = 0; try < AVC_CACHE_SLOTS; try++ ) {
310 hvalue = atomic_inc_return(&av 311 hvalue = atomic_inc_return(&avc_cache.lru_hint) & (AVC_CACHE_SLOTS - 1);
311 312
312 if (!spin_trylock_irqsave(&avc 313 if (!spin_trylock_irqsave(&avc_cache.slots_lock[hvalue], flags))
313 continue; 314 continue;
314 315
315 rcu_read_lock(); <<
316 list_for_each_entry(node, &avc 316 list_for_each_entry(node, &avc_cache.slots[hvalue], list) {
317 if (atomic_dec_and_tes 317 if (atomic_dec_and_test(&node->ae.used)) {
318 /* Recently Un 318 /* Recently Unused */
319 avc_node_delet 319 avc_node_delete(node);
320 avc_cache_stat 320 avc_cache_stats_incr(reclaims);
321 ecx++; 321 ecx++;
322 if (ecx >= AVC 322 if (ecx >= AVC_CACHE_RECLAIM) {
323 rcu_re <<
324 spin_u 323 spin_unlock_irqrestore(&avc_cache.slots_lock[hvalue], flags);
325 goto o 324 goto out;
326 } 325 }
327 } 326 }
328 } 327 }
329 rcu_read_unlock(); <<
330 spin_unlock_irqrestore(&avc_ca 328 spin_unlock_irqrestore(&avc_cache.slots_lock[hvalue], flags);
331 } 329 }
332 out: 330 out:
333 return ecx; 331 return ecx;
334 } 332 }
335 333
336 static struct avc_node *avc_alloc_node(void) 334 static struct avc_node *avc_alloc_node(void)
337 { 335 {
338 struct avc_node *node; 336 struct avc_node *node;
339 337
340 node = kmem_cache_zalloc(avc_node_cach !! 338 node = kmem_cache_alloc(avc_node_cachep, SLAB_ATOMIC);
341 if (!node) 339 if (!node)
342 goto out; 340 goto out;
343 341
>> 342 memset(node, 0, sizeof(*node));
344 INIT_RCU_HEAD(&node->rhead); 343 INIT_RCU_HEAD(&node->rhead);
345 INIT_LIST_HEAD(&node->list); 344 INIT_LIST_HEAD(&node->list);
346 atomic_set(&node->ae.used, 1); 345 atomic_set(&node->ae.used, 1);
347 avc_cache_stats_incr(allocations); 346 avc_cache_stats_incr(allocations);
348 347
349 if (atomic_inc_return(&avc_cache.activ 348 if (atomic_inc_return(&avc_cache.active_nodes) > avc_cache_threshold)
350 avc_reclaim_node(); 349 avc_reclaim_node();
351 350
352 out: 351 out:
353 return node; 352 return node;
354 } 353 }
355 354
356 static void avc_node_populate(struct avc_node 355 static void avc_node_populate(struct avc_node *node, u32 ssid, u32 tsid, u16 tclass, struct avc_entry *ae)
357 { 356 {
358 node->ae.ssid = ssid; 357 node->ae.ssid = ssid;
359 node->ae.tsid = tsid; 358 node->ae.tsid = tsid;
360 node->ae.tclass = tclass; 359 node->ae.tclass = tclass;
361 memcpy(&node->ae.avd, &ae->avd, sizeof 360 memcpy(&node->ae.avd, &ae->avd, sizeof(node->ae.avd));
362 } 361 }
363 362
364 static inline struct avc_node *avc_search_node 363 static inline struct avc_node *avc_search_node(u32 ssid, u32 tsid, u16 tclass)
365 { 364 {
366 struct avc_node *node, *ret = NULL; 365 struct avc_node *node, *ret = NULL;
367 int hvalue; 366 int hvalue;
368 367
369 hvalue = avc_hash(ssid, tsid, tclass); 368 hvalue = avc_hash(ssid, tsid, tclass);
370 list_for_each_entry_rcu(node, &avc_cac 369 list_for_each_entry_rcu(node, &avc_cache.slots[hvalue], list) {
371 if (ssid == node->ae.ssid && 370 if (ssid == node->ae.ssid &&
372 tclass == node->ae.tclass 371 tclass == node->ae.tclass &&
373 tsid == node->ae.tsid) { 372 tsid == node->ae.tsid) {
374 ret = node; 373 ret = node;
375 break; 374 break;
376 } 375 }
377 } 376 }
378 377
379 if (ret == NULL) { 378 if (ret == NULL) {
380 /* cache miss */ 379 /* cache miss */
381 goto out; 380 goto out;
382 } 381 }
383 382
384 /* cache hit */ 383 /* cache hit */
385 if (atomic_read(&ret->ae.used) != 1) 384 if (atomic_read(&ret->ae.used) != 1)
386 atomic_set(&ret->ae.used, 1); 385 atomic_set(&ret->ae.used, 1);
387 out: 386 out:
388 return ret; 387 return ret;
389 } 388 }
390 389
391 /** 390 /**
392 * avc_lookup - Look up an AVC entry. 391 * avc_lookup - Look up an AVC entry.
393 * @ssid: source security identifier 392 * @ssid: source security identifier
394 * @tsid: target security identifier 393 * @tsid: target security identifier
395 * @tclass: target security class 394 * @tclass: target security class
396 * @requested: requested permissions, interpre 395 * @requested: requested permissions, interpreted based on @tclass
397 * 396 *
398 * Look up an AVC entry that is valid for the 397 * Look up an AVC entry that is valid for the
399 * @requested permissions between the SID pair 398 * @requested permissions between the SID pair
400 * (@ssid, @tsid), interpreting the permission 399 * (@ssid, @tsid), interpreting the permissions
401 * based on @tclass. If a valid AVC entry exi 400 * based on @tclass. If a valid AVC entry exists,
402 * then this function return the avc_node. 401 * then this function return the avc_node.
403 * Otherwise, this function returns NULL. 402 * Otherwise, this function returns NULL.
404 */ 403 */
405 static struct avc_node *avc_lookup(u32 ssid, u 404 static struct avc_node *avc_lookup(u32 ssid, u32 tsid, u16 tclass, u32 requested)
406 { 405 {
407 struct avc_node *node; 406 struct avc_node *node;
408 407
409 avc_cache_stats_incr(lookups); 408 avc_cache_stats_incr(lookups);
410 node = avc_search_node(ssid, tsid, tcl 409 node = avc_search_node(ssid, tsid, tclass);
411 410
412 if (node && ((node->ae.avd.decided & r 411 if (node && ((node->ae.avd.decided & requested) == requested)) {
413 avc_cache_stats_incr(hits); 412 avc_cache_stats_incr(hits);
414 goto out; 413 goto out;
415 } 414 }
416 415
417 node = NULL; 416 node = NULL;
418 avc_cache_stats_incr(misses); 417 avc_cache_stats_incr(misses);
419 out: 418 out:
420 return node; 419 return node;
421 } 420 }
422 421
423 static int avc_latest_notif_update(int seqno, 422 static int avc_latest_notif_update(int seqno, int is_insert)
424 { 423 {
425 int ret = 0; 424 int ret = 0;
426 static DEFINE_SPINLOCK(notif_lock); 425 static DEFINE_SPINLOCK(notif_lock);
427 unsigned long flag; 426 unsigned long flag;
428 427
429 spin_lock_irqsave(¬if_lock, flag); 428 spin_lock_irqsave(¬if_lock, flag);
430 if (is_insert) { 429 if (is_insert) {
431 if (seqno < avc_cache.latest_n 430 if (seqno < avc_cache.latest_notif) {
432 printk(KERN_WARNING "a 431 printk(KERN_WARNING "avc: seqno %d < latest_notif %d\n",
433 seqno, avc_cach 432 seqno, avc_cache.latest_notif);
434 ret = -EAGAIN; 433 ret = -EAGAIN;
435 } 434 }
436 } else { 435 } else {
437 if (seqno > avc_cache.latest_n 436 if (seqno > avc_cache.latest_notif)
438 avc_cache.latest_notif 437 avc_cache.latest_notif = seqno;
439 } 438 }
440 spin_unlock_irqrestore(¬if_lock, fl 439 spin_unlock_irqrestore(¬if_lock, flag);
441 440
442 return ret; 441 return ret;
443 } 442 }
444 443
445 /** 444 /**
446 * avc_insert - Insert an AVC entry. 445 * avc_insert - Insert an AVC entry.
447 * @ssid: source security identifier 446 * @ssid: source security identifier
448 * @tsid: target security identifier 447 * @tsid: target security identifier
449 * @tclass: target security class 448 * @tclass: target security class
450 * @ae: AVC entry 449 * @ae: AVC entry
451 * 450 *
452 * Insert an AVC entry for the SID pair 451 * Insert an AVC entry for the SID pair
453 * (@ssid, @tsid) and class @tclass. 452 * (@ssid, @tsid) and class @tclass.
454 * The access vectors and the sequence number 453 * The access vectors and the sequence number are
455 * normally provided by the security server in 454 * normally provided by the security server in
456 * response to a security_compute_av() call. 455 * response to a security_compute_av() call. If the
457 * sequence number @ae->avd.seqno is not less 456 * sequence number @ae->avd.seqno is not less than the latest
458 * revocation notification, then the function 457 * revocation notification, then the function copies
459 * the access vectors into a cache entry, retu 458 * the access vectors into a cache entry, returns
460 * avc_node inserted. Otherwise, this function 459 * avc_node inserted. Otherwise, this function returns NULL.
461 */ 460 */
462 static struct avc_node *avc_insert(u32 ssid, u 461 static struct avc_node *avc_insert(u32 ssid, u32 tsid, u16 tclass, struct avc_entry *ae)
463 { 462 {
464 struct avc_node *pos, *node = NULL; 463 struct avc_node *pos, *node = NULL;
465 int hvalue; 464 int hvalue;
466 unsigned long flag; 465 unsigned long flag;
467 466
468 if (avc_latest_notif_update(ae->avd.se 467 if (avc_latest_notif_update(ae->avd.seqno, 1))
469 goto out; 468 goto out;
470 469
471 node = avc_alloc_node(); 470 node = avc_alloc_node();
472 if (node) { 471 if (node) {
473 hvalue = avc_hash(ssid, tsid, 472 hvalue = avc_hash(ssid, tsid, tclass);
474 avc_node_populate(node, ssid, 473 avc_node_populate(node, ssid, tsid, tclass, ae);
475 474
476 spin_lock_irqsave(&avc_cache.s 475 spin_lock_irqsave(&avc_cache.slots_lock[hvalue], flag);
477 list_for_each_entry(pos, &avc_ 476 list_for_each_entry(pos, &avc_cache.slots[hvalue], list) {
478 if (pos->ae.ssid == ss 477 if (pos->ae.ssid == ssid &&
479 pos->ae.tsid == ts 478 pos->ae.tsid == tsid &&
480 pos->ae.tclass == 479 pos->ae.tclass == tclass) {
481 avc_node_repla 480 avc_node_replace(node, pos);
482 goto found; 481 goto found;
483 } 482 }
484 } 483 }
485 list_add_rcu(&node->list, &avc 484 list_add_rcu(&node->list, &avc_cache.slots[hvalue]);
486 found: 485 found:
487 spin_unlock_irqrestore(&avc_ca 486 spin_unlock_irqrestore(&avc_cache.slots_lock[hvalue], flag);
488 } 487 }
489 out: 488 out:
490 return node; 489 return node;
491 } 490 }
492 491
493 static inline void avc_print_ipv6_addr(struct 492 static inline void avc_print_ipv6_addr(struct audit_buffer *ab,
494 struct !! 493 struct in6_addr *addr, u16 port,
495 char *n 494 char *name1, char *name2)
496 { 495 {
497 if (!ipv6_addr_any(addr)) 496 if (!ipv6_addr_any(addr))
498 audit_log_format(ab, " %s=" NI !! 497 audit_log_format(ab, " %s=%04x:%04x:%04x:%04x:%04x:"
>> 498 "%04x:%04x:%04x", name1, NIP6(*addr));
499 if (port) 499 if (port)
500 audit_log_format(ab, " %s=%d", 500 audit_log_format(ab, " %s=%d", name2, ntohs(port));
501 } 501 }
502 502
503 static inline void avc_print_ipv4_addr(struct !! 503 static inline void avc_print_ipv4_addr(struct audit_buffer *ab, u32 addr,
504 __be16 !! 504 u16 port, char *name1, char *name2)
505 { 505 {
506 if (addr) 506 if (addr)
507 audit_log_format(ab, " %s=" NI !! 507 audit_log_format(ab, " %s=%d.%d.%d.%d", name1, NIPQUAD(addr));
508 if (port) 508 if (port)
509 audit_log_format(ab, " %s=%d", 509 audit_log_format(ab, " %s=%d", name2, ntohs(port));
510 } 510 }
511 511
512 /** 512 /**
513 * avc_audit - Audit the granting or denial of 513 * avc_audit - Audit the granting or denial of permissions.
514 * @ssid: source security identifier 514 * @ssid: source security identifier
515 * @tsid: target security identifier 515 * @tsid: target security identifier
516 * @tclass: target security class 516 * @tclass: target security class
517 * @requested: requested permissions 517 * @requested: requested permissions
518 * @avd: access vector decisions 518 * @avd: access vector decisions
519 * @result: result from avc_has_perm_noaudit 519 * @result: result from avc_has_perm_noaudit
520 * @a: auxiliary audit data 520 * @a: auxiliary audit data
521 * 521 *
522 * Audit the granting or denial of permissions 522 * Audit the granting or denial of permissions in accordance
523 * with the policy. This function is typicall 523 * with the policy. This function is typically called by
524 * avc_has_perm() after a permission check, bu 524 * avc_has_perm() after a permission check, but can also be
525 * called directly by callers who use avc_has_ 525 * called directly by callers who use avc_has_perm_noaudit()
526 * in order to separate the permission check f 526 * in order to separate the permission check from the auditing.
527 * For example, this separation is useful when 527 * For example, this separation is useful when the permission check must
528 * be performed under a lock, to allow the loc 528 * be performed under a lock, to allow the lock to be released
529 * before calling the auditing code. 529 * before calling the auditing code.
530 */ 530 */
531 void avc_audit(u32 ssid, u32 tsid, 531 void avc_audit(u32 ssid, u32 tsid,
532 u16 tclass, u32 requested, 532 u16 tclass, u32 requested,
533 struct av_decision *avd, int re 533 struct av_decision *avd, int result, struct avc_audit_data *a)
534 { 534 {
535 struct task_struct *tsk = current; 535 struct task_struct *tsk = current;
536 struct inode *inode = NULL; 536 struct inode *inode = NULL;
537 u32 denied, audited; 537 u32 denied, audited;
538 struct audit_buffer *ab; 538 struct audit_buffer *ab;
539 539
540 denied = requested & ~avd->allowed; 540 denied = requested & ~avd->allowed;
541 if (denied) { 541 if (denied) {
542 audited = denied; 542 audited = denied;
543 if (!(audited & avd->auditdeny 543 if (!(audited & avd->auditdeny))
544 return; 544 return;
545 } else if (result) { 545 } else if (result) {
546 audited = denied = requested; 546 audited = denied = requested;
547 } else { 547 } else {
548 audited = requested; 548 audited = requested;
549 if (!(audited & avd->auditallo 549 if (!(audited & avd->auditallow))
550 return; 550 return;
551 } 551 }
552 552
553 ab = audit_log_start(current->audit_co !! 553 ab = audit_log_start(current->audit_context);
554 if (!ab) 554 if (!ab)
555 return; /* audit_panic 555 return; /* audit_panic has been called */
556 audit_log_format(ab, "avc: %s ", deni 556 audit_log_format(ab, "avc: %s ", denied ? "denied" : "granted");
557 avc_dump_av(ab, tclass,audited); 557 avc_dump_av(ab, tclass,audited);
558 audit_log_format(ab, " for "); 558 audit_log_format(ab, " for ");
559 if (a && a->tsk) 559 if (a && a->tsk)
560 tsk = a->tsk; 560 tsk = a->tsk;
561 if (tsk && tsk->pid) { 561 if (tsk && tsk->pid) {
562 audit_log_format(ab, " pid=%d !! 562 struct mm_struct *mm;
563 audit_log_untrustedstring(ab, !! 563 struct vm_area_struct *vma;
>> 564 audit_log_format(ab, " pid=%d", tsk->pid);
>> 565 if (tsk == current)
>> 566 mm = current->mm;
>> 567 else
>> 568 mm = get_task_mm(tsk);
>> 569 if (mm) {
>> 570 if (down_read_trylock(&mm->mmap_sem)) {
>> 571 vma = mm->mmap;
>> 572 while (vma) {
>> 573 if ((vma->vm_flags & VM_EXECUTABLE) &&
>> 574 vma->vm_file) {
>> 575 audit_log_d_path(ab, "exe=",
>> 576 vma->vm_file->f_dentry,
>> 577 vma->vm_file->f_vfsmnt);
>> 578 break;
>> 579 }
>> 580 vma = vma->vm_next;
>> 581 }
>> 582 up_read(&mm->mmap_sem);
>> 583 } else {
>> 584 audit_log_format(ab, " comm=%s", tsk->comm);
>> 585 }
>> 586 if (tsk != current)
>> 587 mmput(mm);
>> 588 } else {
>> 589 audit_log_format(ab, " comm=%s", tsk->comm);
>> 590 }
564 } 591 }
565 if (a) { 592 if (a) {
566 switch (a->type) { 593 switch (a->type) {
567 case AVC_AUDIT_DATA_IPC: 594 case AVC_AUDIT_DATA_IPC:
568 audit_log_format(ab, " 595 audit_log_format(ab, " key=%d", a->u.ipc_id);
569 break; 596 break;
570 case AVC_AUDIT_DATA_CAP: 597 case AVC_AUDIT_DATA_CAP:
571 audit_log_format(ab, " 598 audit_log_format(ab, " capability=%d", a->u.cap);
572 break; 599 break;
573 case AVC_AUDIT_DATA_FS: 600 case AVC_AUDIT_DATA_FS:
574 if (a->u.fs.path.dentr !! 601 if (a->u.fs.dentry) {
575 struct dentry !! 602 struct dentry *dentry = a->u.fs.dentry;
576 if (a->u.fs.pa !! 603 if (a->u.fs.mnt) {
577 audit_ !! 604 audit_log_d_path(ab, "path=", dentry,
578 !! 605 a->u.fs.mnt);
579 } else { 606 } else {
580 audit_ !! 607 audit_log_format(ab, " name=%s",
581 audit_ !! 608 dentry->d_name.name);
582 } 609 }
583 inode = dentry 610 inode = dentry->d_inode;
584 } else if (a->u.fs.ino 611 } else if (a->u.fs.inode) {
585 struct dentry 612 struct dentry *dentry;
586 inode = a->u.f 613 inode = a->u.fs.inode;
587 dentry = d_fin 614 dentry = d_find_alias(inode);
588 if (dentry) { 615 if (dentry) {
589 audit_ !! 616 audit_log_format(ab, " name=%s",
590 audit_ !! 617 dentry->d_name.name);
591 dput(d 618 dput(dentry);
592 } 619 }
593 } 620 }
594 if (inode) 621 if (inode)
595 audit_log_form !! 622 audit_log_format(ab, " dev=%s ino=%ld",
596 623 inode->i_sb->s_id,
597 624 inode->i_ino);
598 break; 625 break;
599 case AVC_AUDIT_DATA_NET: 626 case AVC_AUDIT_DATA_NET:
600 if (a->u.net.sk) { 627 if (a->u.net.sk) {
601 struct sock *s 628 struct sock *sk = a->u.net.sk;
602 struct unix_so 629 struct unix_sock *u;
603 int len = 0; 630 int len = 0;
604 char *p = NULL 631 char *p = NULL;
605 632
606 switch (sk->sk 633 switch (sk->sk_family) {
607 case AF_INET: 634 case AF_INET: {
608 struct 635 struct inet_sock *inet = inet_sk(sk);
609 636
610 avc_pr 637 avc_print_ipv4_addr(ab, inet->rcv_saddr,
611 638 inet->sport,
612 639 "laddr", "lport");
613 avc_pr 640 avc_print_ipv4_addr(ab, inet->daddr,
614 641 inet->dport,
615 642 "faddr", "fport");
616 break; 643 break;
617 } 644 }
618 case AF_INET6: 645 case AF_INET6: {
619 struct 646 struct inet_sock *inet = inet_sk(sk);
620 struct 647 struct ipv6_pinfo *inet6 = inet6_sk(sk);
621 648
622 avc_pr 649 avc_print_ipv6_addr(ab, &inet6->rcv_saddr,
623 650 inet->sport,
624 651 "laddr", "lport");
625 avc_pr 652 avc_print_ipv6_addr(ab, &inet6->daddr,
626 653 inet->dport,
627 654 "faddr", "fport");
628 break; 655 break;
629 } 656 }
630 case AF_UNIX: 657 case AF_UNIX:
631 u = un 658 u = unix_sk(sk);
632 if (u- 659 if (u->dentry) {
633 <<
634 <<
635 <<
636 <<
637 660 audit_log_d_path(ab, "path=",
638 !! 661 u->dentry, u->mnt);
639 662 break;
640 } 663 }
641 if (!u 664 if (!u->addr)
642 665 break;
643 len = 666 len = u->addr->len-sizeof(short);
644 p = &u 667 p = &u->addr->name->sun_path[0];
645 audit_ <<
646 if (*p 668 if (*p)
647 !! 669 audit_log_format(ab,
>> 670 "path=%*.*s", len,
>> 671 len, p);
648 else 672 else
649 !! 673 audit_log_format(ab,
>> 674 "path=@%*.*s", len-1,
>> 675 len-1, p+1);
650 break; 676 break;
651 } 677 }
652 } 678 }
653 679
654 switch (a->u.net.famil 680 switch (a->u.net.family) {
655 case AF_INET: 681 case AF_INET:
656 avc_print_ipv4 682 avc_print_ipv4_addr(ab, a->u.net.v4info.saddr,
657 683 a->u.net.sport,
658 684 "saddr", "src");
659 avc_print_ipv4 685 avc_print_ipv4_addr(ab, a->u.net.v4info.daddr,
660 686 a->u.net.dport,
661 687 "daddr", "dest");
662 break; 688 break;
663 case AF_INET6: 689 case AF_INET6:
664 avc_print_ipv6 690 avc_print_ipv6_addr(ab, &a->u.net.v6info.saddr,
665 691 a->u.net.sport,
666 692 "saddr", "src");
667 avc_print_ipv6 693 avc_print_ipv6_addr(ab, &a->u.net.v6info.daddr,
668 694 a->u.net.dport,
669 695 "daddr", "dest");
670 break; 696 break;
671 } 697 }
672 if (a->u.net.netif > 0 !! 698 if (a->u.net.netif)
673 struct net_dev !! 699 audit_log_format(ab, " netif=%s",
674 !! 700 a->u.net.netif);
675 /* NOTE: we al <<
676 dev = dev_get_ <<
677 <<
678 if (dev) { <<
679 audit_ <<
680 <<
681 dev_pu <<
682 } <<
683 } <<
684 break; 701 break;
685 } 702 }
686 } 703 }
687 audit_log_format(ab, " "); 704 audit_log_format(ab, " ");
688 avc_dump_query(ab, ssid, tsid, tclass) 705 avc_dump_query(ab, ssid, tsid, tclass);
689 audit_log_end(ab); 706 audit_log_end(ab);
690 } 707 }
691 708
692 /** 709 /**
693 * avc_add_callback - Register a callback for 710 * avc_add_callback - Register a callback for security events.
694 * @callback: callback function 711 * @callback: callback function
695 * @events: security events 712 * @events: security events
696 * @ssid: source security identifier or %SECSI 713 * @ssid: source security identifier or %SECSID_WILD
697 * @tsid: target security identifier or %SECSI 714 * @tsid: target security identifier or %SECSID_WILD
698 * @tclass: target security class 715 * @tclass: target security class
699 * @perms: permissions 716 * @perms: permissions
700 * 717 *
701 * Register a callback function for events in 718 * Register a callback function for events in the set @events
702 * related to the SID pair (@ssid, @tsid) and 719 * related to the SID pair (@ssid, @tsid) and
703 * and the permissions @perms, interpreting 720 * and the permissions @perms, interpreting
704 * @perms based on @tclass. Returns %0 on suc 721 * @perms based on @tclass. Returns %0 on success or
705 * -%ENOMEM if insufficient memory exists to a 722 * -%ENOMEM if insufficient memory exists to add the callback.
706 */ 723 */
707 int avc_add_callback(int (*callback)(u32 event 724 int avc_add_callback(int (*callback)(u32 event, u32 ssid, u32 tsid,
708 u16 tclas 725 u16 tclass, u32 perms,
709 u32 *out_ 726 u32 *out_retained),
710 u32 events, u32 ssid, u32 727 u32 events, u32 ssid, u32 tsid,
711 u16 tclass, u32 perms) 728 u16 tclass, u32 perms)
712 { 729 {
713 struct avc_callback_node *c; 730 struct avc_callback_node *c;
714 int rc = 0; 731 int rc = 0;
715 732
716 c = kmalloc(sizeof(*c), GFP_ATOMIC); 733 c = kmalloc(sizeof(*c), GFP_ATOMIC);
717 if (!c) { 734 if (!c) {
718 rc = -ENOMEM; 735 rc = -ENOMEM;
719 goto out; 736 goto out;
720 } 737 }
721 738
722 c->callback = callback; 739 c->callback = callback;
723 c->events = events; 740 c->events = events;
724 c->ssid = ssid; 741 c->ssid = ssid;
725 c->tsid = tsid; 742 c->tsid = tsid;
726 c->perms = perms; 743 c->perms = perms;
727 c->next = avc_callbacks; 744 c->next = avc_callbacks;
728 avc_callbacks = c; 745 avc_callbacks = c;
729 out: 746 out:
730 return rc; 747 return rc;
731 } 748 }
732 749
733 static inline int avc_sidcmp(u32 x, u32 y) 750 static inline int avc_sidcmp(u32 x, u32 y)
734 { 751 {
735 return (x == y || x == SECSID_WILD || 752 return (x == y || x == SECSID_WILD || y == SECSID_WILD);
736 } 753 }
737 754
738 /** 755 /**
739 * avc_update_node Update an AVC entry 756 * avc_update_node Update an AVC entry
740 * @event : Updating event 757 * @event : Updating event
741 * @perms : Permission mask bits 758 * @perms : Permission mask bits
742 * @ssid,@tsid,@tclass : identifier of an AVC 759 * @ssid,@tsid,@tclass : identifier of an AVC entry
743 * 760 *
744 * if a valid AVC entry doesn't exist,this fun 761 * if a valid AVC entry doesn't exist,this function returns -ENOENT.
745 * if kmalloc() called internal returns NULL, 762 * if kmalloc() called internal returns NULL, this function returns -ENOMEM.
746 * otherwise, this function update the AVC ent 763 * otherwise, this function update the AVC entry. The original AVC-entry object
747 * will release later by RCU. 764 * will release later by RCU.
748 */ 765 */
749 static int avc_update_node(u32 event, u32 perm 766 static int avc_update_node(u32 event, u32 perms, u32 ssid, u32 tsid, u16 tclass)
750 { 767 {
751 int hvalue, rc = 0; 768 int hvalue, rc = 0;
752 unsigned long flag; 769 unsigned long flag;
753 struct avc_node *pos, *node, *orig = N 770 struct avc_node *pos, *node, *orig = NULL;
754 771
755 node = avc_alloc_node(); 772 node = avc_alloc_node();
756 if (!node) { 773 if (!node) {
757 rc = -ENOMEM; 774 rc = -ENOMEM;
758 goto out; 775 goto out;
759 } 776 }
760 777
761 /* Lock the target slot */ 778 /* Lock the target slot */
762 hvalue = avc_hash(ssid, tsid, tclass); 779 hvalue = avc_hash(ssid, tsid, tclass);
763 spin_lock_irqsave(&avc_cache.slots_loc 780 spin_lock_irqsave(&avc_cache.slots_lock[hvalue], flag);
764 781
765 list_for_each_entry(pos, &avc_cache.sl 782 list_for_each_entry(pos, &avc_cache.slots[hvalue], list){
766 if ( ssid==pos->ae.ssid && 783 if ( ssid==pos->ae.ssid &&
767 tsid==pos->ae.tsid && 784 tsid==pos->ae.tsid &&
768 tclass==pos->ae.tclass ){ 785 tclass==pos->ae.tclass ){
769 orig = pos; 786 orig = pos;
770 break; 787 break;
771 } 788 }
772 } 789 }
773 790
774 if (!orig) { 791 if (!orig) {
775 rc = -ENOENT; 792 rc = -ENOENT;
776 avc_node_kill(node); 793 avc_node_kill(node);
777 goto out_unlock; 794 goto out_unlock;
778 } 795 }
779 796
780 /* 797 /*
781 * Copy and replace original node. 798 * Copy and replace original node.
782 */ 799 */
783 800
784 avc_node_populate(node, ssid, tsid, tc 801 avc_node_populate(node, ssid, tsid, tclass, &orig->ae);
785 802
786 switch (event) { 803 switch (event) {
787 case AVC_CALLBACK_GRANT: 804 case AVC_CALLBACK_GRANT:
788 node->ae.avd.allowed |= perms; 805 node->ae.avd.allowed |= perms;
789 break; 806 break;
790 case AVC_CALLBACK_TRY_REVOKE: 807 case AVC_CALLBACK_TRY_REVOKE:
791 case AVC_CALLBACK_REVOKE: 808 case AVC_CALLBACK_REVOKE:
792 node->ae.avd.allowed &= ~perms 809 node->ae.avd.allowed &= ~perms;
793 break; 810 break;
794 case AVC_CALLBACK_AUDITALLOW_ENABLE: 811 case AVC_CALLBACK_AUDITALLOW_ENABLE:
795 node->ae.avd.auditallow |= per 812 node->ae.avd.auditallow |= perms;
796 break; 813 break;
797 case AVC_CALLBACK_AUDITALLOW_DISABLE: 814 case AVC_CALLBACK_AUDITALLOW_DISABLE:
798 node->ae.avd.auditallow &= ~pe 815 node->ae.avd.auditallow &= ~perms;
799 break; 816 break;
800 case AVC_CALLBACK_AUDITDENY_ENABLE: 817 case AVC_CALLBACK_AUDITDENY_ENABLE:
801 node->ae.avd.auditdeny |= perm 818 node->ae.avd.auditdeny |= perms;
802 break; 819 break;
803 case AVC_CALLBACK_AUDITDENY_DISABLE: 820 case AVC_CALLBACK_AUDITDENY_DISABLE:
804 node->ae.avd.auditdeny &= ~per 821 node->ae.avd.auditdeny &= ~perms;
805 break; 822 break;
806 } 823 }
807 avc_node_replace(node, orig); 824 avc_node_replace(node, orig);
808 out_unlock: 825 out_unlock:
809 spin_unlock_irqrestore(&avc_cache.slot 826 spin_unlock_irqrestore(&avc_cache.slots_lock[hvalue], flag);
810 out: 827 out:
811 return rc; 828 return rc;
812 } 829 }
813 830
>> 831 static int avc_update_cache(u32 event, u32 ssid, u32 tsid,
>> 832 u16 tclass, u32 perms)
>> 833 {
>> 834 struct avc_node *node;
>> 835 int i;
>> 836
>> 837 rcu_read_lock();
>> 838
>> 839 if (ssid == SECSID_WILD || tsid == SECSID_WILD) {
>> 840 /* apply to all matching nodes */
>> 841 for (i = 0; i < AVC_CACHE_SLOTS; i++) {
>> 842 list_for_each_entry_rcu(node, &avc_cache.slots[i], list) {
>> 843 if (avc_sidcmp(ssid, node->ae.ssid) &&
>> 844 avc_sidcmp(tsid, node->ae.tsid) &&
>> 845 tclass == node->ae.tclass ) {
>> 846 avc_update_node(event, perms, node->ae.ssid,
>> 847 node->ae.tsid, node->ae.tclass);
>> 848 }
>> 849 }
>> 850 }
>> 851 } else {
>> 852 /* apply to one node */
>> 853 avc_update_node(event, perms, ssid, tsid, tclass);
>> 854 }
>> 855
>> 856 rcu_read_unlock();
>> 857
>> 858 return 0;
>> 859 }
>> 860
>> 861 static int avc_control(u32 event, u32 ssid, u32 tsid,
>> 862 u16 tclass, u32 perms,
>> 863 u32 seqno, u32 *out_retained)
>> 864 {
>> 865 struct avc_callback_node *c;
>> 866 u32 tretained = 0, cretained = 0;
>> 867 int rc = 0;
>> 868
>> 869 /*
>> 870 * try_revoke only removes permissions from the cache
>> 871 * state if they are not retained by the object manager.
>> 872 * Hence, try_revoke must wait until after the callbacks have
>> 873 * been invoked to update the cache state.
>> 874 */
>> 875 if (event != AVC_CALLBACK_TRY_REVOKE)
>> 876 avc_update_cache(event,ssid,tsid,tclass,perms);
>> 877
>> 878 for (c = avc_callbacks; c; c = c->next)
>> 879 {
>> 880 if ((c->events & event) &&
>> 881 avc_sidcmp(c->ssid, ssid) &&
>> 882 avc_sidcmp(c->tsid, tsid) &&
>> 883 c->tclass == tclass &&
>> 884 (c->perms & perms)) {
>> 885 cretained = 0;
>> 886 rc = c->callback(event, ssid, tsid, tclass,
>> 887 (c->perms & perms),
>> 888 &cretained);
>> 889 if (rc)
>> 890 goto out;
>> 891 tretained |= cretained;
>> 892 }
>> 893 }
>> 894
>> 895 if (event == AVC_CALLBACK_TRY_REVOKE) {
>> 896 /* revoke any unretained permissions */
>> 897 perms &= ~tretained;
>> 898 avc_update_cache(event,ssid,tsid,tclass,perms);
>> 899 *out_retained = tretained;
>> 900 }
>> 901
>> 902 avc_latest_notif_update(seqno, 0);
>> 903
>> 904 out:
>> 905 return rc;
>> 906 }
>> 907
>> 908 /**
>> 909 * avc_ss_grant - Grant previously denied permissions.
>> 910 * @ssid: source security identifier or %SECSID_WILD
>> 911 * @tsid: target security identifier or %SECSID_WILD
>> 912 * @tclass: target security class
>> 913 * @perms: permissions to grant
>> 914 * @seqno: policy sequence number
>> 915 */
>> 916 int avc_ss_grant(u32 ssid, u32 tsid, u16 tclass,
>> 917 u32 perms, u32 seqno)
>> 918 {
>> 919 return avc_control(AVC_CALLBACK_GRANT,
>> 920 ssid, tsid, tclass, perms, seqno, NULL);
>> 921 }
>> 922
>> 923 /**
>> 924 * avc_ss_try_revoke - Try to revoke previously granted permissions.
>> 925 * @ssid: source security identifier or %SECSID_WILD
>> 926 * @tsid: target security identifier or %SECSID_WILD
>> 927 * @tclass: target security class
>> 928 * @perms: permissions to grant
>> 929 * @seqno: policy sequence number
>> 930 * @out_retained: subset of @perms that are retained
>> 931 *
>> 932 * Try to revoke previously granted permissions, but
>> 933 * only if they are not retained as migrated permissions.
>> 934 * Return the subset of permissions that are retained via @out_retained.
>> 935 */
>> 936 int avc_ss_try_revoke(u32 ssid, u32 tsid, u16 tclass,
>> 937 u32 perms, u32 seqno, u32 *out_retained)
>> 938 {
>> 939 return avc_control(AVC_CALLBACK_TRY_REVOKE,
>> 940 ssid, tsid, tclass, perms, seqno, out_retained);
>> 941 }
>> 942
>> 943 /**
>> 944 * avc_ss_revoke - Revoke previously granted permissions.
>> 945 * @ssid: source security identifier or %SECSID_WILD
>> 946 * @tsid: target security identifier or %SECSID_WILD
>> 947 * @tclass: target security class
>> 948 * @perms: permissions to grant
>> 949 * @seqno: policy sequence number
>> 950 *
>> 951 * Revoke previously granted permissions, even if
>> 952 * they are retained as migrated permissions.
>> 953 */
>> 954 int avc_ss_revoke(u32 ssid, u32 tsid, u16 tclass,
>> 955 u32 perms, u32 seqno)
>> 956 {
>> 957 return avc_control(AVC_CALLBACK_REVOKE,
>> 958 ssid, tsid, tclass, perms, seqno, NULL);
>> 959 }
>> 960
814 /** 961 /**
815 * avc_ss_reset - Flush the cache and revalida 962 * avc_ss_reset - Flush the cache and revalidate migrated permissions.
816 * @seqno: policy sequence number 963 * @seqno: policy sequence number
817 */ 964 */
818 int avc_ss_reset(u32 seqno) 965 int avc_ss_reset(u32 seqno)
819 { 966 {
820 struct avc_callback_node *c; 967 struct avc_callback_node *c;
821 int i, rc = 0, tmprc; !! 968 int i, rc = 0;
822 unsigned long flag; 969 unsigned long flag;
823 struct avc_node *node; 970 struct avc_node *node;
824 971
825 for (i = 0; i < AVC_CACHE_SLOTS; i++) 972 for (i = 0; i < AVC_CACHE_SLOTS; i++) {
826 spin_lock_irqsave(&avc_cache.s 973 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 974 list_for_each_entry(node, &avc_cache.slots[i], list)
833 avc_node_delete(node); 975 avc_node_delete(node);
834 rcu_read_unlock(); <<
835 spin_unlock_irqrestore(&avc_ca 976 spin_unlock_irqrestore(&avc_cache.slots_lock[i], flag);
836 } 977 }
837 978
838 for (c = avc_callbacks; c; c = c->next 979 for (c = avc_callbacks; c; c = c->next) {
839 if (c->events & AVC_CALLBACK_R 980 if (c->events & AVC_CALLBACK_RESET) {
840 tmprc = c->callback(AV !! 981 rc = c->callback(AVC_CALLBACK_RESET,
841 0, !! 982 0, 0, 0, 0, NULL);
842 /* save the first erro !! 983 if (rc)
843 value and continue !! 984 goto out;
844 if (!rc) <<
845 rc = tmprc; <<
846 } 985 }
847 } 986 }
848 987
849 avc_latest_notif_update(seqno, 0); 988 avc_latest_notif_update(seqno, 0);
>> 989 out:
850 return rc; 990 return rc;
851 } 991 }
852 992
853 /** 993 /**
>> 994 * avc_ss_set_auditallow - Enable or disable auditing of granted permissions.
>> 995 * @ssid: source security identifier or %SECSID_WILD
>> 996 * @tsid: target security identifier or %SECSID_WILD
>> 997 * @tclass: target security class
>> 998 * @perms: permissions to grant
>> 999 * @seqno: policy sequence number
>> 1000 * @enable: enable flag.
>> 1001 */
>> 1002 int avc_ss_set_auditallow(u32 ssid, u32 tsid, u16 tclass,
>> 1003 u32 perms, u32 seqno, u32 enable)
>> 1004 {
>> 1005 if (enable)
>> 1006 return avc_control(AVC_CALLBACK_AUDITALLOW_ENABLE,
>> 1007 ssid, tsid, tclass, perms, seqno, NULL);
>> 1008 else
>> 1009 return avc_control(AVC_CALLBACK_AUDITALLOW_DISABLE,
>> 1010 ssid, tsid, tclass, perms, seqno, NULL);
>> 1011 }
>> 1012
>> 1013 /**
>> 1014 * avc_ss_set_auditdeny - Enable or disable auditing of denied permissions.
>> 1015 * @ssid: source security identifier or %SECSID_WILD
>> 1016 * @tsid: target security identifier or %SECSID_WILD
>> 1017 * @tclass: target security class
>> 1018 * @perms: permissions to grant
>> 1019 * @seqno: policy sequence number
>> 1020 * @enable: enable flag.
>> 1021 */
>> 1022 int avc_ss_set_auditdeny(u32 ssid, u32 tsid, u16 tclass,
>> 1023 u32 perms, u32 seqno, u32 enable)
>> 1024 {
>> 1025 if (enable)
>> 1026 return avc_control(AVC_CALLBACK_AUDITDENY_ENABLE,
>> 1027 ssid, tsid, tclass, perms, seqno, NULL);
>> 1028 else
>> 1029 return avc_control(AVC_CALLBACK_AUDITDENY_DISABLE,
>> 1030 ssid, tsid, tclass, perms, seqno, NULL);
>> 1031 }
>> 1032
>> 1033 /**
854 * avc_has_perm_noaudit - Check permissions bu 1034 * avc_has_perm_noaudit - Check permissions but perform no auditing.
855 * @ssid: source security identifier 1035 * @ssid: source security identifier
856 * @tsid: target security identifier 1036 * @tsid: target security identifier
857 * @tclass: target security class 1037 * @tclass: target security class
858 * @requested: requested permissions, interpre 1038 * @requested: requested permissions, interpreted based on @tclass
859 * @flags: AVC_STRICT or 0 <<
860 * @avd: access vector decisions 1039 * @avd: access vector decisions
861 * 1040 *
862 * Check the AVC to determine whether the @req 1041 * Check the AVC to determine whether the @requested permissions are granted
863 * for the SID pair (@ssid, @tsid), interpreti 1042 * for the SID pair (@ssid, @tsid), interpreting the permissions
864 * based on @tclass, and call the security ser 1043 * 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 1044 * a new decision and add it to the cache. Return a copy of the decisions
866 * in @avd. Return %0 if all @requested permi 1045 * in @avd. Return %0 if all @requested permissions are granted,
867 * -%EACCES if any permissions are denied, or 1046 * -%EACCES if any permissions are denied, or another -errno upon
868 * other errors. This function is typically c 1047 * other errors. This function is typically called by avc_has_perm(),
869 * but may also be called directly to separate 1048 * but may also be called directly to separate permission checking from
870 * auditing, e.g. in cases where a lock must b 1049 * auditing, e.g. in cases where a lock must be held for the check but
871 * should be released for the auditing. 1050 * should be released for the auditing.
872 */ 1051 */
873 int avc_has_perm_noaudit(u32 ssid, u32 tsid, 1052 int avc_has_perm_noaudit(u32 ssid, u32 tsid,
874 u16 tclass, u32 reque !! 1053 u16 tclass, u32 requested,
875 unsigned flags, !! 1054 struct av_decision *avd)
876 struct av_decision *a <<
877 { 1055 {
878 struct avc_node *node; 1056 struct avc_node *node;
879 struct avc_entry entry, *p_ae; 1057 struct avc_entry entry, *p_ae;
880 int rc = 0; 1058 int rc = 0;
881 u32 denied; 1059 u32 denied;
882 1060
883 rcu_read_lock(); 1061 rcu_read_lock();
884 1062
885 node = avc_lookup(ssid, tsid, tclass, 1063 node = avc_lookup(ssid, tsid, tclass, requested);
886 if (!node) { 1064 if (!node) {
887 rcu_read_unlock(); 1065 rcu_read_unlock();
888 rc = security_compute_av(ssid, 1066 rc = security_compute_av(ssid,tsid,tclass,requested,&entry.avd);
889 if (rc) 1067 if (rc)
890 goto out; 1068 goto out;
891 rcu_read_lock(); 1069 rcu_read_lock();
892 node = avc_insert(ssid,tsid,tc 1070 node = avc_insert(ssid,tsid,tclass,&entry);
893 } 1071 }
894 1072
895 p_ae = node ? &node->ae : &entry; 1073 p_ae = node ? &node->ae : &entry;
896 1074
897 if (avd) 1075 if (avd)
898 memcpy(avd, &p_ae->avd, sizeof 1076 memcpy(avd, &p_ae->avd, sizeof(*avd));
899 1077
900 denied = requested & ~(p_ae->avd.allow 1078 denied = requested & ~(p_ae->avd.allowed);
901 1079
902 if (!requested || denied) { 1080 if (!requested || denied) {
903 if (selinux_enforcing || (flag !! 1081 if (selinux_enforcing)
904 rc = -EACCES; 1082 rc = -EACCES;
905 else 1083 else
906 if (node) 1084 if (node)
907 avc_update_nod 1085 avc_update_node(AVC_CALLBACK_GRANT,requested,
908 1086 ssid,tsid,tclass);
909 } 1087 }
910 1088
911 rcu_read_unlock(); 1089 rcu_read_unlock();
912 out: 1090 out:
913 return rc; 1091 return rc;
914 } 1092 }
915 1093
916 /** 1094 /**
917 * avc_has_perm - Check permissions and perfor 1095 * avc_has_perm - Check permissions and perform any appropriate auditing.
918 * @ssid: source security identifier 1096 * @ssid: source security identifier
919 * @tsid: target security identifier 1097 * @tsid: target security identifier
920 * @tclass: target security class 1098 * @tclass: target security class
921 * @requested: requested permissions, interpre 1099 * @requested: requested permissions, interpreted based on @tclass
922 * @auditdata: auxiliary audit data 1100 * @auditdata: auxiliary audit data
923 * 1101 *
924 * Check the AVC to determine whether the @req 1102 * Check the AVC to determine whether the @requested permissions are granted
925 * for the SID pair (@ssid, @tsid), interpreti 1103 * for the SID pair (@ssid, @tsid), interpreting the permissions
926 * based on @tclass, and call the security ser 1104 * 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 1105 * a new decision and add it to the cache. Audit the granting or denial of
928 * permissions in accordance with the policy. 1106 * permissions in accordance with the policy. Return %0 if all @requested
929 * permissions are granted, -%EACCES if any pe 1107 * permissions are granted, -%EACCES if any permissions are denied, or
930 * another -errno upon other errors. 1108 * another -errno upon other errors.
931 */ 1109 */
932 int avc_has_perm(u32 ssid, u32 tsid, u16 tclas 1110 int avc_has_perm(u32 ssid, u32 tsid, u16 tclass,
933 u32 requested, struct avc_aud 1111 u32 requested, struct avc_audit_data *auditdata)
934 { 1112 {
935 struct av_decision avd; 1113 struct av_decision avd;
936 int rc; 1114 int rc;
937 1115
938 rc = avc_has_perm_noaudit(ssid, tsid, !! 1116 rc = avc_has_perm_noaudit(ssid, tsid, tclass, requested, &avd);
939 avc_audit(ssid, tsid, tclass, requeste 1117 avc_audit(ssid, tsid, tclass, requested, &avd, rc, auditdata);
940 return rc; 1118 return rc;
941 } 1119 }
942 <<
943 u32 avc_policy_seqno(void) <<
944 { <<
945 return avc_cache.latest_notif; <<
946 } <<
947 1120
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