Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 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 Paris | eb5df9a | 2008-04-18 17:38:28 -0400 | [diff] [blame] | 9 | * Added conditional policy language extensions |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * |
| 11 | * Copyright (C) 2003 Tresys Technology, LLC |
| 12 | * This program is free software; you can redistribute it and/or modify |
Eric Paris | eb5df9a | 2008-04-18 17:38:28 -0400 | [diff] [blame] | 13 | * it under the terms of the GNU General Public License as published by |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | * the Free Software Foundation, version 2. |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 15 | * |
| 16 | * Updated: Yuichi Nakamura <ynakam@hitachisoft.jp> |
Eric Paris | eb5df9a | 2008-04-18 17:38:28 -0400 | [diff] [blame] | 17 | * Tuned number of hash slots for avtab to reduce memory usage |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | */ |
| 19 | |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include "avtab.h" |
| 24 | #include "policydb.h" |
| 25 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 26 | static struct kmem_cache *avtab_node_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 28 | static 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | static struct avtab_node* |
| 35 | avtab_insert_node(struct avtab *h, int hvalue, |
Eric Paris | eb5df9a | 2008-04-18 17:38:28 -0400 | [diff] [blame] | 36 | struct avtab_node *prev, struct avtab_node *cur, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | struct avtab_key *key, struct avtab_datum *datum) |
| 38 | { |
Eric Paris | eb5df9a | 2008-04-18 17:38:28 -0400 | [diff] [blame] | 39 | struct avtab_node *newnode; |
Robert P. J. Day | c376222 | 2007-02-10 01:45:03 -0800 | [diff] [blame] | 40 | newnode = kmem_cache_zalloc(avtab_node_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | if (newnode == NULL) |
| 42 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | 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 | |
| 57 | static 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 Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 61 | u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 63 | if (!h || !h->htable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | return -EINVAL; |
| 65 | |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 66 | hvalue = avtab_hash(key, h->mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | 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 Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 73 | (specified & cur->key.specified)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | 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 Paris | eb5df9a | 2008-04-18 17:38:28 -0400 | [diff] [blame] | 87 | if (!newnode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | 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 | */ |
| 97 | struct avtab_node * |
Eric Paris | eb5df9a | 2008-04-18 17:38:28 -0400 | [diff] [blame] | 98 | avtab_insert_nonunique(struct avtab *h, struct avtab_key *key, struct avtab_datum *datum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | { |
| 100 | int hvalue; |
Vesa-Matti J Kari | 0c0e186 | 2008-07-21 02:50:20 +0300 | [diff] [blame] | 101 | struct avtab_node *prev, *cur; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 102 | u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 104 | if (!h || !h->htable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | return NULL; |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 106 | hvalue = avtab_hash(key, h->mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | 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 Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 113 | (specified & cur->key.specified)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | 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 Kari | 0c0e186 | 2008-07-21 02:50:20 +0300 | [diff] [blame] | 125 | return avtab_insert_node(h, hvalue, prev, cur, key, datum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | } |
| 127 | |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 128 | struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *key) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | { |
| 130 | int hvalue; |
| 131 | struct avtab_node *cur; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 132 | u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 134 | if (!h || !h->htable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | return NULL; |
| 136 | |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 137 | hvalue = avtab_hash(key, h->mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | 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 Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 142 | (specified & cur->key.specified)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | 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 | */ |
| 162 | struct avtab_node* |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 163 | avtab_search_node(struct avtab *h, struct avtab_key *key) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | { |
| 165 | int hvalue; |
| 166 | struct avtab_node *cur; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 167 | u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 169 | if (!h || !h->htable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | return NULL; |
| 171 | |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 172 | hvalue = avtab_hash(key, h->mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | 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 Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 177 | (specified & cur->key.specified)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | 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 | |
| 193 | struct avtab_node* |
| 194 | avtab_search_node_next(struct avtab_node *node, int specified) |
| 195 | { |
| 196 | struct avtab_node *cur; |
| 197 | |
| 198 | if (!node) |
| 199 | return NULL; |
| 200 | |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 201 | specified &= ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | 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 Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 206 | (specified & cur->key.specified)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | 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 | |
| 222 | void 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 Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 230 | for (i = 0; i < h->nslot; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | cur = h->htable[i]; |
Vesa-Matti Kari | dbc74c6 | 2008-08-07 03:18:20 +0300 | [diff] [blame] | 232 | while (cur) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | temp = cur; |
| 234 | cur = cur->next; |
| 235 | kmem_cache_free(avtab_node_cachep, temp); |
| 236 | } |
| 237 | h->htable[i] = NULL; |
| 238 | } |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 239 | kfree(h->htable); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | h->htable = NULL; |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 241 | h->nslot = 0; |
| 242 | h->mask = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | } |
| 244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | int avtab_init(struct avtab *h) |
| 246 | { |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 247 | h->htable = NULL; |
| 248 | h->nel = 0; |
| 249 | return 0; |
| 250 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 252 | int 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; |
| 269 | if (nslot > MAX_AVTAB_SIZE) |
| 270 | nslot = MAX_AVTAB_SIZE; |
| 271 | mask = nslot - 1; |
| 272 | |
| 273 | h->htable = kcalloc(nslot, sizeof(*(h->htable)), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | if (!h->htable) |
| 275 | return -ENOMEM; |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 276 | |
| 277 | avtab_alloc_out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | h->nel = 0; |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 279 | h->nslot = nslot; |
| 280 | h->mask = mask; |
James Morris | 454d972 | 2008-02-26 20:42:02 +1100 | [diff] [blame] | 281 | printk(KERN_DEBUG "SELinux: %d avtab hash slots, %d rules.\n", |
| 282 | h->nslot, nrules); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | void avtab_hash_eval(struct avtab *h, char *tag) |
| 287 | { |
| 288 | int i, chain_len, slots_used, max_chain_len; |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 289 | unsigned long long chain2_len_sum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | struct avtab_node *cur; |
| 291 | |
| 292 | slots_used = 0; |
| 293 | max_chain_len = 0; |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 294 | chain2_len_sum = 0; |
| 295 | for (i = 0; i < h->nslot; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | 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 Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 307 | chain2_len_sum += chain_len * chain_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | } |
| 309 | } |
| 310 | |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 311 | printk(KERN_DEBUG "SELinux: %s: %d entries and %d/%d buckets used, " |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 312 | "longest chain length %d sum of chain length^2 %llu\n", |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 313 | tag, h->nel, slots_used, h->nslot, max_chain_len, |
| 314 | chain2_len_sum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | } |
| 316 | |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 317 | static 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 Smalley | 45e5421 | 2007-11-07 10:08:00 -0500 | [diff] [blame] | 326 | int avtab_read_item(struct avtab *a, void *fp, struct policydb *pol, |
Eric Paris | eb5df9a | 2008-04-18 17:38:28 -0400 | [diff] [blame] | 327 | int (*insertf)(struct avtab *a, struct avtab_key *k, |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 328 | struct avtab_datum *d, void *p), |
| 329 | void *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | { |
Alexey Dobriyan | b5bf6c5 | 2005-09-03 15:55:17 -0700 | [diff] [blame] | 331 | __le16 buf16[4]; |
| 332 | u16 enabled; |
| 333 | __le32 buf32[7]; |
Stephen Smalley | 45e5421 | 2007-11-07 10:08:00 -0500 | [diff] [blame] | 334 | u32 items, items2, val, vers = pol->policyvers; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 335 | struct avtab_key key; |
| 336 | struct avtab_datum datum; |
| 337 | int i, rc; |
Stephen Smalley | 45e5421 | 2007-11-07 10:08:00 -0500 | [diff] [blame] | 338 | unsigned set; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 340 | memset(&key, 0, sizeof(struct avtab_key)); |
| 341 | memset(&datum, 0, sizeof(struct avtab_datum)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 343 | if (vers < POLICYDB_VERSION_AVTAB) { |
| 344 | rc = next_entry(buf32, fp, sizeof(u32)); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 345 | if (rc) { |
James Morris | 454d972 | 2008-02-26 20:42:02 +1100 | [diff] [blame] | 346 | printk(KERN_ERR "SELinux: avtab: truncated entry\n"); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 347 | return rc; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 348 | } |
| 349 | items2 = le32_to_cpu(buf32[0]); |
| 350 | if (items2 > ARRAY_SIZE(buf32)) { |
James Morris | 454d972 | 2008-02-26 20:42:02 +1100 | [diff] [blame] | 351 | printk(KERN_ERR "SELinux: avtab: entry overflow\n"); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 352 | return -EINVAL; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 353 | |
| 354 | } |
| 355 | rc = next_entry(buf32, fp, sizeof(u32)*items2); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 356 | if (rc) { |
James Morris | 454d972 | 2008-02-26 20:42:02 +1100 | [diff] [blame] | 357 | printk(KERN_ERR "SELinux: avtab: truncated entry\n"); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 358 | return rc; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 359 | } |
| 360 | items = 0; |
| 361 | |
| 362 | val = le32_to_cpu(buf32[items++]); |
| 363 | key.source_type = (u16)val; |
| 364 | if (key.source_type != val) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 365 | printk(KERN_ERR "SELinux: avtab: truncated source type\n"); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 366 | return -EINVAL; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 367 | } |
| 368 | val = le32_to_cpu(buf32[items++]); |
| 369 | key.target_type = (u16)val; |
| 370 | if (key.target_type != val) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 371 | printk(KERN_ERR "SELinux: avtab: truncated target type\n"); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 372 | return -EINVAL; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 373 | } |
| 374 | val = le32_to_cpu(buf32[items++]); |
| 375 | key.target_class = (u16)val; |
| 376 | if (key.target_class != val) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 377 | printk(KERN_ERR "SELinux: avtab: truncated target class\n"); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 378 | return -EINVAL; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 379 | } |
| 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 Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 385 | printk(KERN_ERR "SELinux: avtab: null entry\n"); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 386 | return -EINVAL; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 387 | } |
| 388 | if ((val & AVTAB_AV) && |
| 389 | (val & AVTAB_TYPE)) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 390 | printk(KERN_ERR "SELinux: avtab: entry has both access vectors and types\n"); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 391 | return -EINVAL; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 392 | } |
| 393 | |
Tobias Klauser | 32725ad | 2006-01-06 00:11:23 -0800 | [diff] [blame] | 394 | for (i = 0; i < ARRAY_SIZE(spec_order); i++) { |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 395 | 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 Paris | eb5df9a | 2008-04-18 17:38:28 -0400 | [diff] [blame] | 399 | if (rc) |
| 400 | return rc; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 401 | } |
| 402 | } |
| 403 | |
| 404 | if (items != items2) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 405 | printk(KERN_ERR "SELinux: avtab: entry only had %d items, expected %d\n", items2, items); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 406 | return -EINVAL; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 407 | } |
| 408 | return 0; |
| 409 | } |
| 410 | |
| 411 | rc = next_entry(buf16, fp, sizeof(u16)*4); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 412 | if (rc) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 413 | printk(KERN_ERR "SELinux: avtab: truncated entry\n"); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 414 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | } |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 416 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | items = 0; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 418 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | |
Stephen Smalley | 45e5421 | 2007-11-07 10:08:00 -0500 | [diff] [blame] | 423 | 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 Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 426 | printk(KERN_ERR "SELinux: avtab: invalid type or class\n"); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 427 | return -EINVAL; |
Stephen Smalley | 45e5421 | 2007-11-07 10:08:00 -0500 | [diff] [blame] | 428 | } |
| 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 Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 436 | printk(KERN_ERR "SELinux: avtab: more than one specifier\n"); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 437 | return -EINVAL; |
Stephen Smalley | 45e5421 | 2007-11-07 10:08:00 -0500 | [diff] [blame] | 438 | } |
| 439 | |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 440 | rc = next_entry(buf32, fp, sizeof(u32)); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 441 | if (rc) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 442 | printk(KERN_ERR "SELinux: avtab: truncated entry\n"); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 443 | return rc; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 444 | } |
| 445 | datum.data = le32_to_cpu(*buf32); |
Stephen Smalley | 45e5421 | 2007-11-07 10:08:00 -0500 | [diff] [blame] | 446 | if ((key.specified & AVTAB_TYPE) && |
| 447 | !policydb_type_isvalid(pol, datum.data)) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 448 | printk(KERN_ERR "SELinux: avtab: invalid type\n"); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 449 | return -EINVAL; |
Stephen Smalley | 45e5421 | 2007-11-07 10:08:00 -0500 | [diff] [blame] | 450 | } |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 451 | return insertf(a, &key, &datum, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | } |
| 453 | |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 454 | static 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 Smalley | 45e5421 | 2007-11-07 10:08:00 -0500 | [diff] [blame] | 460 | int avtab_read(struct avtab *a, void *fp, struct policydb *pol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | { |
| 462 | int rc; |
Alexey Dobriyan | b5bf6c5 | 2005-09-03 15:55:17 -0700 | [diff] [blame] | 463 | __le32 buf[1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | u32 nel, i; |
| 465 | |
| 466 | |
| 467 | rc = next_entry(buf, fp, sizeof(u32)); |
| 468 | if (rc < 0) { |
James Morris | 454d972 | 2008-02-26 20:42:02 +1100 | [diff] [blame] | 469 | printk(KERN_ERR "SELinux: avtab: truncated table\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | goto bad; |
| 471 | } |
| 472 | nel = le32_to_cpu(buf[0]); |
| 473 | if (!nel) { |
James Morris | 454d972 | 2008-02-26 20:42:02 +1100 | [diff] [blame] | 474 | printk(KERN_ERR "SELinux: avtab: table is empty\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | rc = -EINVAL; |
| 476 | goto bad; |
| 477 | } |
Yuichi Nakamura | 3232c11 | 2007-08-24 11:55:11 +0900 | [diff] [blame] | 478 | |
| 479 | rc = avtab_alloc(a, nel); |
| 480 | if (rc) |
| 481 | goto bad; |
| 482 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | for (i = 0; i < nel; i++) { |
Stephen Smalley | 45e5421 | 2007-11-07 10:08:00 -0500 | [diff] [blame] | 484 | rc = avtab_read_item(a, fp, pol, avtab_insertf, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | if (rc) { |
| 486 | if (rc == -ENOMEM) |
James Morris | 454d972 | 2008-02-26 20:42:02 +1100 | [diff] [blame] | 487 | printk(KERN_ERR "SELinux: avtab: out of memory\n"); |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 488 | else if (rc == -EEXIST) |
James Morris | 454d972 | 2008-02-26 20:42:02 +1100 | [diff] [blame] | 489 | printk(KERN_ERR "SELinux: avtab: duplicate entry\n"); |
Dan Carpenter | 9e0bd4c | 2010-06-12 20:50:35 +0200 | [diff] [blame^] | 490 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | goto bad; |
| 492 | } |
| 493 | } |
| 494 | |
| 495 | rc = 0; |
| 496 | out: |
| 497 | return rc; |
| 498 | |
| 499 | bad: |
| 500 | avtab_destroy(a); |
| 501 | goto out; |
| 502 | } |
| 503 | |
| 504 | void avtab_cache_init(void) |
| 505 | { |
| 506 | avtab_node_cachep = kmem_cache_create("avtab_node", |
| 507 | sizeof(struct avtab_node), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 508 | 0, SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | } |
| 510 | |
| 511 | void avtab_cache_destroy(void) |
| 512 | { |
Eric Paris | eb5df9a | 2008-04-18 17:38:28 -0400 | [diff] [blame] | 513 | kmem_cache_destroy(avtab_node_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | } |