blob: a3dd9faa19c01eda269b13f7cfcd7ab6da6aa098 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Implementation of the access vector table type.
3 *
4 * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
5 */
6
7/* Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
8 *
Eric Pariseb5df9a2008-04-18 17:38:28 -04009 * Added conditional policy language extensions
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 *
11 * Copyright (C) 2003 Tresys Technology, LLC
12 * This program is free software; you can redistribute it and/or modify
Eric Pariseb5df9a2008-04-18 17:38:28 -040013 * it under the terms of the GNU General Public License as published by
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * the Free Software Foundation, version 2.
Yuichi Nakamura3232c112007-08-24 11:55:11 +090015 *
16 * Updated: Yuichi Nakamura <ynakam@hitachisoft.jp>
Eric Pariseb5df9a2008-04-18 17:38:28 -040017 * Tuned number of hash slots for avtab to reduce memory usage
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 */
19
20#include <linux/kernel.h>
21#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include "avtab.h"
24#include "policydb.h"
25
Christoph Lametere18b8902006-12-06 20:33:20 -080026static struct kmem_cache *avtab_node_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
Yuichi Nakamura3232c112007-08-24 11:55:11 +090028static inline int avtab_hash(struct avtab_key *keyp, u16 mask)
29{
30 return ((keyp->target_class + (keyp->target_type << 2) +
31 (keyp->source_type << 9)) & mask);
32}
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034static struct avtab_node*
35avtab_insert_node(struct avtab *h, int hvalue,
Eric Pariseb5df9a2008-04-18 17:38:28 -040036 struct avtab_node *prev, struct avtab_node *cur,
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 struct avtab_key *key, struct avtab_datum *datum)
38{
Eric Pariseb5df9a2008-04-18 17:38:28 -040039 struct avtab_node *newnode;
Robert P. J. Dayc3762222007-02-10 01:45:03 -080040 newnode = kmem_cache_zalloc(avtab_node_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 if (newnode == NULL)
42 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 newnode->key = *key;
44 newnode->datum = *datum;
45 if (prev) {
46 newnode->next = prev->next;
47 prev->next = newnode;
48 } else {
49 newnode->next = h->htable[hvalue];
50 h->htable[hvalue] = newnode;
51 }
52
53 h->nel++;
54 return newnode;
55}
56
57static int avtab_insert(struct avtab *h, struct avtab_key *key, struct avtab_datum *datum)
58{
59 int hvalue;
60 struct avtab_node *prev, *cur, *newnode;
Stephen Smalley782ebb92005-09-03 15:55:16 -070061 u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Yuichi Nakamura3232c112007-08-24 11:55:11 +090063 if (!h || !h->htable)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 return -EINVAL;
65
Yuichi Nakamura3232c112007-08-24 11:55:11 +090066 hvalue = avtab_hash(key, h->mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 for (prev = NULL, cur = h->htable[hvalue];
68 cur;
69 prev = cur, cur = cur->next) {
70 if (key->source_type == cur->key.source_type &&
71 key->target_type == cur->key.target_type &&
72 key->target_class == cur->key.target_class &&
Stephen Smalley782ebb92005-09-03 15:55:16 -070073 (specified & cur->key.specified))
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 return -EEXIST;
75 if (key->source_type < cur->key.source_type)
76 break;
77 if (key->source_type == cur->key.source_type &&
78 key->target_type < cur->key.target_type)
79 break;
80 if (key->source_type == cur->key.source_type &&
81 key->target_type == cur->key.target_type &&
82 key->target_class < cur->key.target_class)
83 break;
84 }
85
86 newnode = avtab_insert_node(h, hvalue, prev, cur, key, datum);
Eric Pariseb5df9a2008-04-18 17:38:28 -040087 if (!newnode)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 return -ENOMEM;
89
90 return 0;
91}
92
93/* Unlike avtab_insert(), this function allow multiple insertions of the same
94 * key/specified mask into the table, as needed by the conditional avtab.
95 * It also returns a pointer to the node inserted.
96 */
97struct avtab_node *
Eric Pariseb5df9a2008-04-18 17:38:28 -040098avtab_insert_nonunique(struct avtab *h, struct avtab_key *key, struct avtab_datum *datum)
Linus Torvalds1da177e2005-04-16 15:20:36 -070099{
100 int hvalue;
Vesa-Matti J Kari0c0e1862008-07-21 02:50:20 +0300101 struct avtab_node *prev, *cur;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700102 u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900104 if (!h || !h->htable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 return NULL;
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900106 hvalue = avtab_hash(key, h->mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 for (prev = NULL, cur = h->htable[hvalue];
108 cur;
109 prev = cur, cur = cur->next) {
110 if (key->source_type == cur->key.source_type &&
111 key->target_type == cur->key.target_type &&
112 key->target_class == cur->key.target_class &&
Stephen Smalley782ebb92005-09-03 15:55:16 -0700113 (specified & cur->key.specified))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 break;
115 if (key->source_type < cur->key.source_type)
116 break;
117 if (key->source_type == cur->key.source_type &&
118 key->target_type < cur->key.target_type)
119 break;
120 if (key->source_type == cur->key.source_type &&
121 key->target_type == cur->key.target_type &&
122 key->target_class < cur->key.target_class)
123 break;
124 }
Vesa-Matti J Kari0c0e1862008-07-21 02:50:20 +0300125 return avtab_insert_node(h, hvalue, prev, cur, key, datum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126}
127
Stephen Smalley782ebb92005-09-03 15:55:16 -0700128struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129{
130 int hvalue;
131 struct avtab_node *cur;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700132 u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900134 if (!h || !h->htable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 return NULL;
136
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900137 hvalue = avtab_hash(key, h->mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 for (cur = h->htable[hvalue]; cur; cur = cur->next) {
139 if (key->source_type == cur->key.source_type &&
140 key->target_type == cur->key.target_type &&
141 key->target_class == cur->key.target_class &&
Stephen Smalley782ebb92005-09-03 15:55:16 -0700142 (specified & cur->key.specified))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 return &cur->datum;
144
145 if (key->source_type < cur->key.source_type)
146 break;
147 if (key->source_type == cur->key.source_type &&
148 key->target_type < cur->key.target_type)
149 break;
150 if (key->source_type == cur->key.source_type &&
151 key->target_type == cur->key.target_type &&
152 key->target_class < cur->key.target_class)
153 break;
154 }
155
156 return NULL;
157}
158
159/* This search function returns a node pointer, and can be used in
160 * conjunction with avtab_search_next_node()
161 */
162struct avtab_node*
Stephen Smalley782ebb92005-09-03 15:55:16 -0700163avtab_search_node(struct avtab *h, struct avtab_key *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
165 int hvalue;
166 struct avtab_node *cur;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700167 u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900169 if (!h || !h->htable)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 return NULL;
171
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900172 hvalue = avtab_hash(key, h->mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 for (cur = h->htable[hvalue]; cur; cur = cur->next) {
174 if (key->source_type == cur->key.source_type &&
175 key->target_type == cur->key.target_type &&
176 key->target_class == cur->key.target_class &&
Stephen Smalley782ebb92005-09-03 15:55:16 -0700177 (specified & cur->key.specified))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 return cur;
179
180 if (key->source_type < cur->key.source_type)
181 break;
182 if (key->source_type == cur->key.source_type &&
183 key->target_type < cur->key.target_type)
184 break;
185 if (key->source_type == cur->key.source_type &&
186 key->target_type == cur->key.target_type &&
187 key->target_class < cur->key.target_class)
188 break;
189 }
190 return NULL;
191}
192
193struct avtab_node*
194avtab_search_node_next(struct avtab_node *node, int specified)
195{
196 struct avtab_node *cur;
197
198 if (!node)
199 return NULL;
200
Stephen Smalley782ebb92005-09-03 15:55:16 -0700201 specified &= ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 for (cur = node->next; cur; cur = cur->next) {
203 if (node->key.source_type == cur->key.source_type &&
204 node->key.target_type == cur->key.target_type &&
205 node->key.target_class == cur->key.target_class &&
Stephen Smalley782ebb92005-09-03 15:55:16 -0700206 (specified & cur->key.specified))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 return cur;
208
209 if (node->key.source_type < cur->key.source_type)
210 break;
211 if (node->key.source_type == cur->key.source_type &&
212 node->key.target_type < cur->key.target_type)
213 break;
214 if (node->key.source_type == cur->key.source_type &&
215 node->key.target_type == cur->key.target_type &&
216 node->key.target_class < cur->key.target_class)
217 break;
218 }
219 return NULL;
220}
221
222void avtab_destroy(struct avtab *h)
223{
224 int i;
225 struct avtab_node *cur, *temp;
226
227 if (!h || !h->htable)
228 return;
229
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900230 for (i = 0; i < h->nslot; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 cur = h->htable[i];
Vesa-Matti Karidbc74c62008-08-07 03:18:20 +0300232 while (cur) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 temp = cur;
234 cur = cur->next;
235 kmem_cache_free(avtab_node_cachep, temp);
236 }
237 h->htable[i] = NULL;
238 }
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900239 kfree(h->htable);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 h->htable = NULL;
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900241 h->nslot = 0;
242 h->mask = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243}
244
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245int avtab_init(struct avtab *h)
246{
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900247 h->htable = NULL;
248 h->nel = 0;
249 return 0;
250}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900252int avtab_alloc(struct avtab *h, u32 nrules)
253{
254 u16 mask = 0;
255 u32 shift = 0;
256 u32 work = nrules;
257 u32 nslot = 0;
258
259 if (nrules == 0)
260 goto avtab_alloc_out;
261
262 while (work) {
263 work = work >> 1;
264 shift++;
265 }
266 if (shift > 2)
267 shift = shift - 2;
268 nslot = 1 << shift;
Eric Paris00d85c82010-10-13 17:50:19 -0400269 if (nslot > MAX_AVTAB_HASH_BUCKETS)
270 nslot = MAX_AVTAB_HASH_BUCKETS;
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900271 mask = nslot - 1;
272
273 h->htable = kcalloc(nslot, sizeof(*(h->htable)), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 if (!h->htable)
275 return -ENOMEM;
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900276
277 avtab_alloc_out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 h->nel = 0;
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900279 h->nslot = nslot;
280 h->mask = mask;
James Morris454d9722008-02-26 20:42:02 +1100281 printk(KERN_DEBUG "SELinux: %d avtab hash slots, %d rules.\n",
282 h->nslot, nrules);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 return 0;
284}
285
286void avtab_hash_eval(struct avtab *h, char *tag)
287{
288 int i, chain_len, slots_used, max_chain_len;
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900289 unsigned long long chain2_len_sum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 struct avtab_node *cur;
291
292 slots_used = 0;
293 max_chain_len = 0;
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900294 chain2_len_sum = 0;
295 for (i = 0; i < h->nslot; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 cur = h->htable[i];
297 if (cur) {
298 slots_used++;
299 chain_len = 0;
300 while (cur) {
301 chain_len++;
302 cur = cur->next;
303 }
304
305 if (chain_len > max_chain_len)
306 max_chain_len = chain_len;
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900307 chain2_len_sum += chain_len * chain_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 }
309 }
310
Eric Paris744ba352008-04-17 11:52:44 -0400311 printk(KERN_DEBUG "SELinux: %s: %d entries and %d/%d buckets used, "
Eric Parisf5269712008-05-14 11:27:45 -0400312 "longest chain length %d sum of chain length^2 %llu\n",
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900313 tag, h->nel, slots_used, h->nslot, max_chain_len,
314 chain2_len_sum);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315}
316
Stephen Smalley782ebb92005-09-03 15:55:16 -0700317static uint16_t spec_order[] = {
318 AVTAB_ALLOWED,
319 AVTAB_AUDITDENY,
320 AVTAB_AUDITALLOW,
321 AVTAB_TRANSITION,
322 AVTAB_CHANGE,
323 AVTAB_MEMBER
324};
325
Stephen Smalley45e54212007-11-07 10:08:00 -0500326int avtab_read_item(struct avtab *a, void *fp, struct policydb *pol,
Eric Pariseb5df9a2008-04-18 17:38:28 -0400327 int (*insertf)(struct avtab *a, struct avtab_key *k,
Stephen Smalley782ebb92005-09-03 15:55:16 -0700328 struct avtab_datum *d, void *p),
329 void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330{
Alexey Dobriyanb5bf6c52005-09-03 15:55:17 -0700331 __le16 buf16[4];
332 u16 enabled;
333 __le32 buf32[7];
Stephen Smalley45e54212007-11-07 10:08:00 -0500334 u32 items, items2, val, vers = pol->policyvers;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700335 struct avtab_key key;
336 struct avtab_datum datum;
337 int i, rc;
Stephen Smalley45e54212007-11-07 10:08:00 -0500338 unsigned set;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
Stephen Smalley782ebb92005-09-03 15:55:16 -0700340 memset(&key, 0, sizeof(struct avtab_key));
341 memset(&datum, 0, sizeof(struct avtab_datum));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
Stephen Smalley782ebb92005-09-03 15:55:16 -0700343 if (vers < POLICYDB_VERSION_AVTAB) {
344 rc = next_entry(buf32, fp, sizeof(u32));
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200345 if (rc) {
James Morris454d9722008-02-26 20:42:02 +1100346 printk(KERN_ERR "SELinux: avtab: truncated entry\n");
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200347 return rc;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700348 }
349 items2 = le32_to_cpu(buf32[0]);
350 if (items2 > ARRAY_SIZE(buf32)) {
James Morris454d9722008-02-26 20:42:02 +1100351 printk(KERN_ERR "SELinux: avtab: entry overflow\n");
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200352 return -EINVAL;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700353
354 }
355 rc = next_entry(buf32, fp, sizeof(u32)*items2);
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200356 if (rc) {
James Morris454d9722008-02-26 20:42:02 +1100357 printk(KERN_ERR "SELinux: avtab: truncated entry\n");
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200358 return rc;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700359 }
360 items = 0;
361
362 val = le32_to_cpu(buf32[items++]);
363 key.source_type = (u16)val;
364 if (key.source_type != val) {
Eric Paris744ba352008-04-17 11:52:44 -0400365 printk(KERN_ERR "SELinux: avtab: truncated source type\n");
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200366 return -EINVAL;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700367 }
368 val = le32_to_cpu(buf32[items++]);
369 key.target_type = (u16)val;
370 if (key.target_type != val) {
Eric Paris744ba352008-04-17 11:52:44 -0400371 printk(KERN_ERR "SELinux: avtab: truncated target type\n");
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200372 return -EINVAL;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700373 }
374 val = le32_to_cpu(buf32[items++]);
375 key.target_class = (u16)val;
376 if (key.target_class != val) {
Eric Paris744ba352008-04-17 11:52:44 -0400377 printk(KERN_ERR "SELinux: avtab: truncated target class\n");
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200378 return -EINVAL;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700379 }
380
381 val = le32_to_cpu(buf32[items++]);
382 enabled = (val & AVTAB_ENABLED_OLD) ? AVTAB_ENABLED : 0;
383
384 if (!(val & (AVTAB_AV | AVTAB_TYPE))) {
Eric Paris744ba352008-04-17 11:52:44 -0400385 printk(KERN_ERR "SELinux: avtab: null entry\n");
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200386 return -EINVAL;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700387 }
388 if ((val & AVTAB_AV) &&
389 (val & AVTAB_TYPE)) {
Eric Paris744ba352008-04-17 11:52:44 -0400390 printk(KERN_ERR "SELinux: avtab: entry has both access vectors and types\n");
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200391 return -EINVAL;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700392 }
393
Tobias Klauser32725ad2006-01-06 00:11:23 -0800394 for (i = 0; i < ARRAY_SIZE(spec_order); i++) {
Stephen Smalley782ebb92005-09-03 15:55:16 -0700395 if (val & spec_order[i]) {
396 key.specified = spec_order[i] | enabled;
397 datum.data = le32_to_cpu(buf32[items++]);
398 rc = insertf(a, &key, &datum, p);
Eric Pariseb5df9a2008-04-18 17:38:28 -0400399 if (rc)
400 return rc;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700401 }
402 }
403
404 if (items != items2) {
Eric Paris744ba352008-04-17 11:52:44 -0400405 printk(KERN_ERR "SELinux: avtab: entry only had %d items, expected %d\n", items2, items);
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200406 return -EINVAL;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700407 }
408 return 0;
409 }
410
411 rc = next_entry(buf16, fp, sizeof(u16)*4);
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200412 if (rc) {
Eric Paris744ba352008-04-17 11:52:44 -0400413 printk(KERN_ERR "SELinux: avtab: truncated entry\n");
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200414 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 }
Stephen Smalley782ebb92005-09-03 15:55:16 -0700416
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 items = 0;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700418 key.source_type = le16_to_cpu(buf16[items++]);
419 key.target_type = le16_to_cpu(buf16[items++]);
420 key.target_class = le16_to_cpu(buf16[items++]);
421 key.specified = le16_to_cpu(buf16[items++]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
Stephen Smalley45e54212007-11-07 10:08:00 -0500423 if (!policydb_type_isvalid(pol, key.source_type) ||
424 !policydb_type_isvalid(pol, key.target_type) ||
425 !policydb_class_isvalid(pol, key.target_class)) {
Eric Paris744ba352008-04-17 11:52:44 -0400426 printk(KERN_ERR "SELinux: avtab: invalid type or class\n");
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200427 return -EINVAL;
Stephen Smalley45e54212007-11-07 10:08:00 -0500428 }
429
430 set = 0;
431 for (i = 0; i < ARRAY_SIZE(spec_order); i++) {
432 if (key.specified & spec_order[i])
433 set++;
434 }
435 if (!set || set > 1) {
Eric Paris744ba352008-04-17 11:52:44 -0400436 printk(KERN_ERR "SELinux: avtab: more than one specifier\n");
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200437 return -EINVAL;
Stephen Smalley45e54212007-11-07 10:08:00 -0500438 }
439
Stephen Smalley782ebb92005-09-03 15:55:16 -0700440 rc = next_entry(buf32, fp, sizeof(u32));
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200441 if (rc) {
Eric Paris744ba352008-04-17 11:52:44 -0400442 printk(KERN_ERR "SELinux: avtab: truncated entry\n");
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200443 return rc;
Stephen Smalley782ebb92005-09-03 15:55:16 -0700444 }
445 datum.data = le32_to_cpu(*buf32);
Stephen Smalley45e54212007-11-07 10:08:00 -0500446 if ((key.specified & AVTAB_TYPE) &&
447 !policydb_type_isvalid(pol, datum.data)) {
Eric Paris744ba352008-04-17 11:52:44 -0400448 printk(KERN_ERR "SELinux: avtab: invalid type\n");
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200449 return -EINVAL;
Stephen Smalley45e54212007-11-07 10:08:00 -0500450 }
Stephen Smalley782ebb92005-09-03 15:55:16 -0700451 return insertf(a, &key, &datum, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452}
453
Stephen Smalley782ebb92005-09-03 15:55:16 -0700454static int avtab_insertf(struct avtab *a, struct avtab_key *k,
455 struct avtab_datum *d, void *p)
456{
457 return avtab_insert(a, k, d);
458}
459
Stephen Smalley45e54212007-11-07 10:08:00 -0500460int avtab_read(struct avtab *a, void *fp, struct policydb *pol)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461{
462 int rc;
Alexey Dobriyanb5bf6c52005-09-03 15:55:17 -0700463 __le32 buf[1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 u32 nel, i;
465
466
467 rc = next_entry(buf, fp, sizeof(u32));
468 if (rc < 0) {
James Morris454d9722008-02-26 20:42:02 +1100469 printk(KERN_ERR "SELinux: avtab: truncated table\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 goto bad;
471 }
472 nel = le32_to_cpu(buf[0]);
473 if (!nel) {
James Morris454d9722008-02-26 20:42:02 +1100474 printk(KERN_ERR "SELinux: avtab: table is empty\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 rc = -EINVAL;
476 goto bad;
477 }
Yuichi Nakamura3232c112007-08-24 11:55:11 +0900478
479 rc = avtab_alloc(a, nel);
480 if (rc)
481 goto bad;
482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 for (i = 0; i < nel; i++) {
Stephen Smalley45e54212007-11-07 10:08:00 -0500484 rc = avtab_read_item(a, fp, pol, avtab_insertf, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 if (rc) {
486 if (rc == -ENOMEM)
James Morris454d9722008-02-26 20:42:02 +1100487 printk(KERN_ERR "SELinux: avtab: out of memory\n");
Stephen Smalley782ebb92005-09-03 15:55:16 -0700488 else if (rc == -EEXIST)
James Morris454d9722008-02-26 20:42:02 +1100489 printk(KERN_ERR "SELinux: avtab: duplicate entry\n");
Dan Carpenter9e0bd4c2010-06-12 20:50:35 +0200490
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 goto bad;
492 }
493 }
494
495 rc = 0;
496out:
497 return rc;
498
499bad:
500 avtab_destroy(a);
501 goto out;
502}
503
Eric Pariscee74f42010-10-13 17:50:25 -0400504int avtab_write_item(struct policydb *p, struct avtab_node *cur, void *fp)
505{
506 __le16 buf16[4];
507 __le32 buf32[1];
508 int rc;
509
510 buf16[0] = cpu_to_le16(cur->key.source_type);
511 buf16[1] = cpu_to_le16(cur->key.target_type);
512 buf16[2] = cpu_to_le16(cur->key.target_class);
513 buf16[3] = cpu_to_le16(cur->key.specified);
514 rc = put_entry(buf16, sizeof(u16), 4, fp);
515 if (rc)
516 return rc;
517 buf32[0] = cpu_to_le32(cur->datum.data);
518 rc = put_entry(buf32, sizeof(u32), 1, fp);
519 if (rc)
520 return rc;
521 return 0;
522}
523
524int avtab_write(struct policydb *p, struct avtab *a, void *fp)
525{
526 unsigned int i;
527 int rc = 0;
528 struct avtab_node *cur;
529 __le32 buf[1];
530
531 buf[0] = cpu_to_le32(a->nel);
532 rc = put_entry(buf, sizeof(u32), 1, fp);
533 if (rc)
534 return rc;
535
536 for (i = 0; i < a->nslot; i++) {
537 for (cur = a->htable[i]; cur; cur = cur->next) {
538 rc = avtab_write_item(p, cur, fp);
539 if (rc)
540 return rc;
541 }
542 }
543
544 return rc;
545}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546void avtab_cache_init(void)
547{
548 avtab_node_cachep = kmem_cache_create("avtab_node",
549 sizeof(struct avtab_node),
Paul Mundt20c2df82007-07-20 10:11:58 +0900550 0, SLAB_PANIC, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551}
552
553void avtab_cache_destroy(void)
554{
Eric Pariseb5df9a2008-04-18 17:38:28 -0400555 kmem_cache_destroy(avtab_node_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556}