| 1 |
/* |
| 2 |
* fs/sakura_mount.c |
| 3 |
* |
| 4 |
* Implementation of the Domain-Free Mandatory Access Control. |
| 5 |
* |
| 6 |
* Copyright (C) 2005-2008 NTT DATA CORPORATION |
| 7 |
* |
| 8 |
* Version: 1.6.6-pre 2008/12/01 |
| 9 |
* |
| 10 |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
| 11 |
* See README.ccs for ChangeLog. |
| 12 |
* |
| 13 |
*/ |
| 14 |
|
| 15 |
#include <linux/ccs_common.h> |
| 16 |
#include <linux/sakura.h> |
| 17 |
#include <linux/realpath.h> |
| 18 |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) |
| 19 |
#include <linux/namespace.h> |
| 20 |
#endif |
| 21 |
|
| 22 |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 15) |
| 23 |
#define MS_UNBINDABLE (1<<17) /* change to unbindable */ |
| 24 |
#define MS_PRIVATE (1<<18) /* change to private */ |
| 25 |
#define MS_SLAVE (1<<19) /* change to slave */ |
| 26 |
#define MS_SHARED (1<<20) /* change to shared */ |
| 27 |
#endif |
| 28 |
|
| 29 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
| 30 |
#include <linux/namei.h> |
| 31 |
#else |
| 32 |
/* For compatibility with older kernels. */ |
| 33 |
static inline void module_put(struct module *module) |
| 34 |
{ |
| 35 |
if (module) |
| 36 |
__MOD_DEC_USE_COUNT(module); |
| 37 |
} |
| 38 |
#endif |
| 39 |
|
| 40 |
/* Keywords for mount restrictions. */ |
| 41 |
|
| 42 |
/* Allow to call 'mount --bind /source_dir /dest_dir' */ |
| 43 |
#define MOUNT_BIND_KEYWORD "--bind" |
| 44 |
/* Allow to call 'mount --move /old_dir /new_dir ' */ |
| 45 |
#define MOUNT_MOVE_KEYWORD "--move" |
| 46 |
/* Allow to call 'mount -o remount /dir ' */ |
| 47 |
#define MOUNT_REMOUNT_KEYWORD "--remount" |
| 48 |
/* Allow to call 'mount --make-unbindable /dir' */ |
| 49 |
#define MOUNT_MAKE_UNBINDABLE_KEYWORD "--make-unbindable" |
| 50 |
/* Allow to call 'mount --make-private /dir' */ |
| 51 |
#define MOUNT_MAKE_PRIVATE_KEYWORD "--make-private" |
| 52 |
/* Allow to call 'mount --make-slave /dir' */ |
| 53 |
#define MOUNT_MAKE_SLAVE_KEYWORD "--make-slave" |
| 54 |
/* Allow to call 'mount --make-shared /dir' */ |
| 55 |
#define MOUNT_MAKE_SHARED_KEYWORD "--make-shared" |
| 56 |
|
| 57 |
/* Structure for "allow_mount" keyword. */ |
| 58 |
struct mount_entry { |
| 59 |
struct list1_head list; |
| 60 |
const struct path_info *dev_name; |
| 61 |
const struct path_info *dir_name; |
| 62 |
const struct path_info *fs_type; |
| 63 |
unsigned long flags; |
| 64 |
bool is_deleted; |
| 65 |
}; |
| 66 |
|
| 67 |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 24) |
| 68 |
/* For compatibility with older kernels. */ |
| 69 |
static void put_filesystem(struct file_system_type *fs) |
| 70 |
{ |
| 71 |
module_put(fs->owner); |
| 72 |
} |
| 73 |
#endif |
| 74 |
|
| 75 |
/* The list for "struct mount_entry". */ |
| 76 |
static LIST1_HEAD(mount_list); |
| 77 |
|
| 78 |
/** |
| 79 |
* update_mount_acl - Update "struct mount_entry" list. |
| 80 |
* |
| 81 |
* @dev_name: Name of device file. |
| 82 |
* @dir_name: Name of mount point. |
| 83 |
* @fs_type: Name of filesystem. |
| 84 |
* @flags: Mount options. |
| 85 |
* @is_delete: True if it is a delete request. |
| 86 |
* |
| 87 |
* Returns 0 on success, negative value otherwise. |
| 88 |
*/ |
| 89 |
static int update_mount_acl(const char *dev_name, const char *dir_name, |
| 90 |
const char *fs_type, const unsigned long flags, |
| 91 |
const bool is_delete) |
| 92 |
{ |
| 93 |
struct file_system_type *type = NULL; |
| 94 |
struct mount_entry *new_entry; |
| 95 |
struct mount_entry *ptr; |
| 96 |
const struct path_info *fs; |
| 97 |
const struct path_info *dev; |
| 98 |
const struct path_info *dir; |
| 99 |
static DEFINE_MUTEX(lock); |
| 100 |
int error = -ENOMEM; |
| 101 |
fs = ccs_save_name(fs_type); |
| 102 |
if (!fs) |
| 103 |
return -EINVAL; |
| 104 |
if (!dev_name) |
| 105 |
/* Map dev_name to "<NULL>" for if no dev_name given. */ |
| 106 |
dev_name = "<NULL>"; |
| 107 |
if (!strcmp(fs->name, MOUNT_REMOUNT_KEYWORD)) |
| 108 |
/* Fix dev_name to "any" for remount permission. */ |
| 109 |
dev_name = "any"; |
| 110 |
if (!strcmp(fs->name, MOUNT_MAKE_UNBINDABLE_KEYWORD) || |
| 111 |
!strcmp(fs->name, MOUNT_MAKE_PRIVATE_KEYWORD) || |
| 112 |
!strcmp(fs->name, MOUNT_MAKE_SLAVE_KEYWORD) || |
| 113 |
!strcmp(fs->name, MOUNT_MAKE_SHARED_KEYWORD)) |
| 114 |
dev_name = "any"; |
| 115 |
if (!ccs_is_correct_path(dev_name, 0, 0, 0, __func__) || |
| 116 |
!ccs_is_correct_path(dir_name, 0, 0, 0, __func__)) |
| 117 |
return -EINVAL; |
| 118 |
dev = ccs_save_name(dev_name); |
| 119 |
dir = ccs_save_name(dir_name); |
| 120 |
if (!dev || !dir) |
| 121 |
return -ENOMEM; |
| 122 |
mutex_lock(&lock); |
| 123 |
list1_for_each_entry(ptr, &mount_list, list) { |
| 124 |
if (ptr->flags != flags || |
| 125 |
ccs_pathcmp(ptr->dev_name, dev) || |
| 126 |
ccs_pathcmp(ptr->dir_name, dir) || |
| 127 |
ccs_pathcmp(ptr->fs_type, fs)) |
| 128 |
continue; |
| 129 |
error = 0; |
| 130 |
if (is_delete) { |
| 131 |
ptr->is_deleted = true; |
| 132 |
goto out; |
| 133 |
} else { |
| 134 |
if (ptr->is_deleted) { |
| 135 |
ptr->is_deleted = false; |
| 136 |
goto update; |
| 137 |
} |
| 138 |
goto out; /* No changes. */ |
| 139 |
} |
| 140 |
} |
| 141 |
if (is_delete) { |
| 142 |
error = -ENOENT; |
| 143 |
goto out; |
| 144 |
} |
| 145 |
new_entry = ccs_alloc_element(sizeof(*new_entry)); |
| 146 |
if (!new_entry) |
| 147 |
goto out; |
| 148 |
new_entry->dev_name = dev; |
| 149 |
new_entry->dir_name = dir; |
| 150 |
new_entry->fs_type = fs; |
| 151 |
new_entry->flags = flags; |
| 152 |
list1_add_tail_mb(&new_entry->list, &mount_list); |
| 153 |
error = 0; |
| 154 |
ptr = new_entry; |
| 155 |
update: |
| 156 |
if (!strcmp(fs->name, MOUNT_REMOUNT_KEYWORD)) { |
| 157 |
printk(KERN_CONT "%sAllow remount %s with options 0x%lX.\n", |
| 158 |
ccs_log_level, dir->name, ptr->flags); |
| 159 |
} else if (!strcmp(fs->name, MOUNT_BIND_KEYWORD) |
| 160 |
|| !strcmp(fs->name, MOUNT_MOVE_KEYWORD)) { |
| 161 |
printk(KERN_CONT "%sAllow mount %s %s %s with options 0x%lX\n", |
| 162 |
ccs_log_level, fs->name, dev->name, dir->name, |
| 163 |
ptr->flags); |
| 164 |
} else if (!strcmp(fs->name, MOUNT_MAKE_UNBINDABLE_KEYWORD) || |
| 165 |
!strcmp(fs->name, MOUNT_MAKE_PRIVATE_KEYWORD) || |
| 166 |
!strcmp(fs->name, MOUNT_MAKE_SLAVE_KEYWORD) || |
| 167 |
!strcmp(fs->name, MOUNT_MAKE_SHARED_KEYWORD)) { |
| 168 |
printk(KERN_CONT "%sAllow mount %s %s with options 0x%lX.\n", |
| 169 |
ccs_log_level, fs->name, dir->name, ptr->flags); |
| 170 |
} else { |
| 171 |
type = get_fs_type(fs->name); |
| 172 |
if (type && (type->fs_flags & FS_REQUIRES_DEV) != 0) |
| 173 |
printk(KERN_CONT "%sAllow mount -t %s %s %s " |
| 174 |
"with options 0x%lX.\n", ccs_log_level, |
| 175 |
fs->name, dev->name, dir->name, ptr->flags); |
| 176 |
else |
| 177 |
printk(KERN_CONT "%sAllow mount %s on %s " |
| 178 |
"with options 0x%lX.\n", ccs_log_level, |
| 179 |
fs->name, dir->name, ptr->flags); |
| 180 |
} |
| 181 |
if (type) |
| 182 |
put_filesystem(type); |
| 183 |
out: |
| 184 |
mutex_unlock(&lock); |
| 185 |
ccs_update_counter(CCS_UPDATES_COUNTER_SYSTEM_POLICY); |
| 186 |
return error; |
| 187 |
} |
| 188 |
|
| 189 |
/** |
| 190 |
* print_success - Print success messages. |
| 191 |
* |
| 192 |
* @dev_name: Name of device file. |
| 193 |
* @dir_name: Name of mount point. |
| 194 |
* @type: Name of filesystem type. |
| 195 |
* @flags: Mount options. |
| 196 |
* @need_dev: Type of @dev_name. |
| 197 |
* |
| 198 |
* Returns nothing. |
| 199 |
*/ |
| 200 |
static void print_success(const char *dev_name, const char *dir_name, |
| 201 |
const char *type, const unsigned long flags, |
| 202 |
const int need_dev) |
| 203 |
{ |
| 204 |
if (need_dev > 0) { |
| 205 |
printk(KERN_DEBUG "SAKURA-NOTICE: " |
| 206 |
"'mount -t %s %s %s 0x%lX' accepted.\n", |
| 207 |
type, dev_name, dir_name, flags); |
| 208 |
} else if (need_dev < 0) { |
| 209 |
printk(KERN_DEBUG "SAKURA-NOTICE: " |
| 210 |
"'mount %s %s %s 0x%lX' accepted.\n", |
| 211 |
type, dev_name, dir_name, flags); |
| 212 |
} else if (!strcmp(type, MOUNT_REMOUNT_KEYWORD)) { |
| 213 |
printk(KERN_DEBUG "SAKURA-NOTICE: " |
| 214 |
"'mount -o remount %s 0x%lX' accepted.\n", |
| 215 |
dir_name, flags); |
| 216 |
} else if (!strcmp(type, MOUNT_MAKE_UNBINDABLE_KEYWORD) || |
| 217 |
!strcmp(type, MOUNT_MAKE_PRIVATE_KEYWORD) || |
| 218 |
!strcmp(type, MOUNT_MAKE_SLAVE_KEYWORD) || |
| 219 |
!strcmp(type, MOUNT_MAKE_SHARED_KEYWORD)) { |
| 220 |
printk(KERN_DEBUG "SAKURA-NOTICE: " |
| 221 |
"'mount %s %s 0x%lX' accepted.\n", |
| 222 |
type, dir_name, flags); |
| 223 |
} else { |
| 224 |
printk(KERN_DEBUG "SAKURA-NOTICE: " |
| 225 |
"'mount %s on %s 0x%lX' accepted.\n", |
| 226 |
type, dir_name, flags); |
| 227 |
} |
| 228 |
} |
| 229 |
|
| 230 |
/** |
| 231 |
* print_error - Print error messages. |
| 232 |
* |
| 233 |
* @r: Pointer to "struct ccs_request_info". |
| 234 |
* @dev_name: Name of device file. |
| 235 |
* @dir_name: Name of mount point. |
| 236 |
* @type: Name of filesystem type. |
| 237 |
* @flags: Mount options. |
| 238 |
* @error: Error value. |
| 239 |
* |
| 240 |
* Returns 0 if permitted by the administrator's decision, negative value |
| 241 |
* otherwise. |
| 242 |
*/ |
| 243 |
static int print_error(struct ccs_request_info *r, |
| 244 |
const char *dev_name, const char *dir_name, |
| 245 |
const char *type, const unsigned long flags, |
| 246 |
int error) |
| 247 |
{ |
| 248 |
const bool is_enforce = (r->mode == 3); |
| 249 |
const char *realname1 = ccs_realpath(dev_name); |
| 250 |
const char *realname2 = ccs_realpath(dir_name); |
| 251 |
const char *exename = ccs_get_exe(); |
| 252 |
const pid_t pid = (pid_t) sys_getpid(); |
| 253 |
if (!strcmp(type, MOUNT_REMOUNT_KEYWORD)) { |
| 254 |
printk(KERN_WARNING "SAKURA-%s: mount -o remount %s 0x%lX " |
| 255 |
"(pid=%d:exe=%s): Permission denied.\n", |
| 256 |
ccs_get_msg(is_enforce), |
| 257 |
realname2 ? realname2 : dir_name, |
| 258 |
flags, pid, exename); |
| 259 |
if (is_enforce) |
| 260 |
error = ccs_check_supervisor(r, "# %s is requesting\n" |
| 261 |
"mount -o remount %s " |
| 262 |
"0x%lX\n", exename, |
| 263 |
realname2 ? realname2 |
| 264 |
: dir_name, flags); |
| 265 |
} else if (!strcmp(type, MOUNT_BIND_KEYWORD) |
| 266 |
|| !strcmp(type, MOUNT_MOVE_KEYWORD)) { |
| 267 |
printk(KERN_WARNING "SAKURA-%s: mount %s %s %s 0x%lX " |
| 268 |
"(pid=%d:exe=%s): Permission denied.\n", |
| 269 |
ccs_get_msg(is_enforce), type, |
| 270 |
realname1 ? realname1 : dev_name, |
| 271 |
realname2 ? realname2 : dir_name, |
| 272 |
flags, pid, exename); |
| 273 |
if (is_enforce) |
| 274 |
error = ccs_check_supervisor(r, "# %s is requesting\n" |
| 275 |
"mount %s %s %s 0x%lX\n", |
| 276 |
exename, type, |
| 277 |
realname1 ? realname1 : |
| 278 |
dev_name, |
| 279 |
realname2 ? realname2 : |
| 280 |
dir_name, flags); |
| 281 |
} else if (!strcmp(type, MOUNT_MAKE_UNBINDABLE_KEYWORD) || |
| 282 |
!strcmp(type, MOUNT_MAKE_PRIVATE_KEYWORD) || |
| 283 |
!strcmp(type, MOUNT_MAKE_SLAVE_KEYWORD) || |
| 284 |
!strcmp(type, MOUNT_MAKE_SHARED_KEYWORD)) { |
| 285 |
printk(KERN_WARNING "SAKURA-%s: mount %s %s 0x%lX " |
| 286 |
"(pid=%d:exe=%s): Permission denied.\n", |
| 287 |
ccs_get_msg(is_enforce), type, |
| 288 |
realname2 ? realname2 : dir_name, |
| 289 |
flags, pid, exename); |
| 290 |
if (is_enforce) |
| 291 |
error = ccs_check_supervisor(r, "# %s is requesting\n" |
| 292 |
"mount %s %s 0x%lX", |
| 293 |
exename, type, |
| 294 |
realname2 ? realname2 : |
| 295 |
dir_name, flags); |
| 296 |
} else { |
| 297 |
printk(KERN_WARNING "SAKURA-%s: mount -t %s %s %s 0x%lX " |
| 298 |
"(pid=%d:exe=%s): Permission denied.\n", |
| 299 |
ccs_get_msg(is_enforce), type, |
| 300 |
realname1 ? realname1 : dev_name, |
| 301 |
realname2 ? realname2 : dir_name, |
| 302 |
flags, pid, exename); |
| 303 |
if (is_enforce) |
| 304 |
error = ccs_check_supervisor(r, "# %s is requesting\n" |
| 305 |
"mount -t %s %s %s " |
| 306 |
"0x%lX\n", exename, type, |
| 307 |
realname1 ? realname1 : |
| 308 |
dev_name, |
| 309 |
realname2 ? realname2 : |
| 310 |
dir_name, flags); |
| 311 |
} |
| 312 |
ccs_free(exename); |
| 313 |
ccs_free(realname2); |
| 314 |
ccs_free(realname1); |
| 315 |
return error; |
| 316 |
} |
| 317 |
|
| 318 |
/** |
| 319 |
* check_mount_permission2 - Check permission for mount() operation. |
| 320 |
* |
| 321 |
* @r: Pointer to "struct ccs_request_info". |
| 322 |
* @dev_name: Name of device file. |
| 323 |
* @dir_name: Name of mount point. |
| 324 |
* @type: Name of filesystem type. May be NULL. |
| 325 |
* @flags: Mount options. |
| 326 |
* |
| 327 |
* Returns 0 on success, negative value otherwise. |
| 328 |
*/ |
| 329 |
static int check_mount_permission2(struct ccs_request_info *r, |
| 330 |
char *dev_name, char *dir_name, char *type, |
| 331 |
unsigned long flags) |
| 332 |
{ |
| 333 |
const bool is_enforce = (r->mode == 3); |
| 334 |
int error; |
| 335 |
retry: |
| 336 |
error = -EPERM; |
| 337 |
if (!type) |
| 338 |
type = "<NULL>"; |
| 339 |
if ((flags & MS_MGC_MSK) == MS_MGC_VAL) |
| 340 |
flags &= ~MS_MGC_MSK; |
| 341 |
switch (flags & (MS_REMOUNT | MS_MOVE | MS_BIND)) { |
| 342 |
case MS_REMOUNT: |
| 343 |
case MS_MOVE: |
| 344 |
case MS_BIND: |
| 345 |
case 0: |
| 346 |
break; |
| 347 |
default: |
| 348 |
printk(KERN_WARNING "SAKURA-ERROR: " |
| 349 |
"%s%s%sare given for single mount operation.\n", |
| 350 |
flags & MS_REMOUNT ? "'remount' " : "", |
| 351 |
flags & MS_MOVE ? "'move' " : "", |
| 352 |
flags & MS_BIND ? "'bind' " : ""); |
| 353 |
return -EINVAL; |
| 354 |
} |
| 355 |
switch (flags & (MS_UNBINDABLE | MS_PRIVATE | MS_SLAVE | MS_SHARED)) { |
| 356 |
case MS_UNBINDABLE: |
| 357 |
case MS_PRIVATE: |
| 358 |
case MS_SLAVE: |
| 359 |
case MS_SHARED: |
| 360 |
case 0: |
| 361 |
break; |
| 362 |
default: |
| 363 |
printk(KERN_WARNING "SAKURA-ERROR: " |
| 364 |
"%s%s%s%sare given for single mount operation.\n", |
| 365 |
flags & MS_UNBINDABLE ? "'unbindable' " : "", |
| 366 |
flags & MS_PRIVATE ? "'private' " : "", |
| 367 |
flags & MS_SLAVE ? "'slave' " : "", |
| 368 |
flags & MS_SHARED ? "'shared' " : ""); |
| 369 |
return -EINVAL; |
| 370 |
} |
| 371 |
if (flags & MS_REMOUNT) { |
| 372 |
error = check_mount_permission2(r, dev_name, dir_name, |
| 373 |
MOUNT_REMOUNT_KEYWORD, |
| 374 |
flags & ~MS_REMOUNT); |
| 375 |
} else if (flags & MS_MOVE) { |
| 376 |
error = check_mount_permission2(r, dev_name, dir_name, |
| 377 |
MOUNT_MOVE_KEYWORD, |
| 378 |
flags & ~MS_MOVE); |
| 379 |
} else if (flags & MS_BIND) { |
| 380 |
error = check_mount_permission2(r, dev_name, dir_name, |
| 381 |
MOUNT_BIND_KEYWORD, |
| 382 |
flags & ~MS_BIND); |
| 383 |
} else if (flags & MS_UNBINDABLE) { |
| 384 |
error = check_mount_permission2(r, dev_name, dir_name, |
| 385 |
MOUNT_MAKE_UNBINDABLE_KEYWORD, |
| 386 |
flags & ~MS_UNBINDABLE); |
| 387 |
} else if (flags & MS_PRIVATE) { |
| 388 |
error = check_mount_permission2(r, dev_name, dir_name, |
| 389 |
MOUNT_MAKE_PRIVATE_KEYWORD, |
| 390 |
flags & ~MS_PRIVATE); |
| 391 |
} else if (flags & MS_SLAVE) { |
| 392 |
error = check_mount_permission2(r, dev_name, dir_name, |
| 393 |
MOUNT_MAKE_SLAVE_KEYWORD, |
| 394 |
flags & ~MS_SLAVE); |
| 395 |
} else if (flags & MS_SHARED) { |
| 396 |
error = check_mount_permission2(r, dev_name, dir_name, |
| 397 |
MOUNT_MAKE_SHARED_KEYWORD, |
| 398 |
flags & ~MS_SHARED); |
| 399 |
} else { |
| 400 |
struct mount_entry *ptr; |
| 401 |
struct file_system_type *fstype = NULL; |
| 402 |
const char *requested_dir_name = NULL; |
| 403 |
const char *requested_dev_name = NULL; |
| 404 |
struct path_info rdev; |
| 405 |
struct path_info rdir; |
| 406 |
int need_dev = 0; |
| 407 |
|
| 408 |
requested_dir_name = ccs_realpath(dir_name); |
| 409 |
if (!requested_dir_name) { |
| 410 |
error = -ENOENT; |
| 411 |
goto cleanup; |
| 412 |
} |
| 413 |
rdir.name = requested_dir_name; |
| 414 |
ccs_fill_path_info(&rdir); |
| 415 |
|
| 416 |
/* Compare fs name. */ |
| 417 |
if (!strcmp(type, MOUNT_REMOUNT_KEYWORD)) { |
| 418 |
/* Needn't to resolve dev_name */ |
| 419 |
} else if (!strcmp(type, MOUNT_MAKE_UNBINDABLE_KEYWORD) || |
| 420 |
!strcmp(type, MOUNT_MAKE_PRIVATE_KEYWORD) || |
| 421 |
!strcmp(type, MOUNT_MAKE_SLAVE_KEYWORD) || |
| 422 |
!strcmp(type, MOUNT_MAKE_SHARED_KEYWORD)) { |
| 423 |
/* Needn't to resolve dev_name */ |
| 424 |
} else if (!strcmp(type, MOUNT_BIND_KEYWORD) || |
| 425 |
!strcmp(type, MOUNT_MOVE_KEYWORD)) { |
| 426 |
requested_dev_name = ccs_realpath(dev_name); |
| 427 |
if (!requested_dev_name) { |
| 428 |
error = -ENOENT; |
| 429 |
goto cleanup; |
| 430 |
} |
| 431 |
rdev.name = requested_dev_name; |
| 432 |
ccs_fill_path_info(&rdev); |
| 433 |
/* dev_name is a directory */ |
| 434 |
need_dev = -1; |
| 435 |
} else { |
| 436 |
fstype = get_fs_type(type); |
| 437 |
if (fstype) { |
| 438 |
if (fstype->fs_flags & FS_REQUIRES_DEV) { |
| 439 |
requested_dev_name |
| 440 |
= ccs_realpath(dev_name); |
| 441 |
if (!requested_dev_name) { |
| 442 |
error = -ENOENT; |
| 443 |
goto cleanup; |
| 444 |
} |
| 445 |
rdev.name = requested_dev_name; |
| 446 |
ccs_fill_path_info(&rdev); |
| 447 |
/* dev_name is a block device file */ |
| 448 |
need_dev = 1; |
| 449 |
} |
| 450 |
} else { |
| 451 |
error = -ENODEV; |
| 452 |
goto cleanup; |
| 453 |
} |
| 454 |
} |
| 455 |
list1_for_each_entry(ptr, &mount_list, list) { |
| 456 |
if (ptr->is_deleted) |
| 457 |
continue; |
| 458 |
|
| 459 |
/* Compare options */ |
| 460 |
if (ptr->flags != flags) |
| 461 |
continue; |
| 462 |
|
| 463 |
/* Compare fs name. */ |
| 464 |
if (strcmp(type, ptr->fs_type->name)) |
| 465 |
continue; |
| 466 |
|
| 467 |
/* Compare mount point. */ |
| 468 |
if (ccs_path_matches_pattern(&rdir, ptr->dir_name) == 0) |
| 469 |
continue; |
| 470 |
|
| 471 |
/* Compare device name. */ |
| 472 |
if (requested_dev_name && |
| 473 |
ccs_path_matches_pattern(&rdev, ptr->dev_name) == 0) |
| 474 |
continue; |
| 475 |
|
| 476 |
/* OK. */ |
| 477 |
error = 0; |
| 478 |
print_success(requested_dev_name, requested_dir_name, |
| 479 |
type, flags, need_dev); |
| 480 |
break; |
| 481 |
} |
| 482 |
if (error) |
| 483 |
error = print_error(r, dev_name, dir_name, type, flags, |
| 484 |
error); |
| 485 |
if (error && r->mode == 1) |
| 486 |
update_mount_acl(need_dev ? |
| 487 |
requested_dev_name : dev_name, |
| 488 |
requested_dir_name, type, flags, 0); |
| 489 |
cleanup: |
| 490 |
ccs_free(requested_dev_name); |
| 491 |
ccs_free(requested_dir_name); |
| 492 |
if (fstype) |
| 493 |
put_filesystem(fstype); |
| 494 |
} |
| 495 |
if (!is_enforce) |
| 496 |
error = 0; |
| 497 |
if (error == 1) |
| 498 |
goto retry; |
| 499 |
return error; |
| 500 |
} |
| 501 |
|
| 502 |
/** |
| 503 |
* ccs_check_mount_permission - Check permission for mount() operation. |
| 504 |
* |
| 505 |
* @dev_name: Name of device file. |
| 506 |
* @dir_name: Name of mount point. |
| 507 |
* @type: Name of filesystem type. May be NULL. |
| 508 |
* @flags: Mount options. |
| 509 |
* |
| 510 |
* Returns 0 on success, negative value otherwise. |
| 511 |
*/ |
| 512 |
int ccs_check_mount_permission(char *dev_name, char *dir_name, char *type, |
| 513 |
const unsigned long *flags) |
| 514 |
{ |
| 515 |
struct ccs_request_info r; |
| 516 |
if (!ccs_can_sleep()) |
| 517 |
return 0; |
| 518 |
ccs_init_request_info(&r, NULL, CCS_SAKURA_RESTRICT_MOUNT); |
| 519 |
if (!r.mode) |
| 520 |
return 0; |
| 521 |
return check_mount_permission2(&r, dev_name, dir_name, type, *flags); |
| 522 |
} |
| 523 |
|
| 524 |
/** |
| 525 |
* ccs_write_mount_policy - Write "struct mount_entry" list. |
| 526 |
* |
| 527 |
* @data: String to parse. |
| 528 |
* @is_delete: True if it is a delete request. |
| 529 |
* |
| 530 |
* Returns 0 on success, negative value otherwise. |
| 531 |
*/ |
| 532 |
int ccs_write_mount_policy(char *data, const bool is_delete) |
| 533 |
{ |
| 534 |
char *cp; |
| 535 |
char *cp2; |
| 536 |
const char *fs; |
| 537 |
const char *dev; |
| 538 |
const char *dir; |
| 539 |
unsigned long flags = 0; |
| 540 |
cp2 = data; |
| 541 |
cp = strchr(cp2, ' '); |
| 542 |
if (!cp) |
| 543 |
return -EINVAL; |
| 544 |
*cp = '\0'; |
| 545 |
dev = cp2; |
| 546 |
cp2 = cp + 1; |
| 547 |
cp = strchr(cp2, ' '); |
| 548 |
if (!cp) |
| 549 |
return -EINVAL; |
| 550 |
*cp = '\0'; |
| 551 |
dir = cp2; |
| 552 |
cp2 = cp + 1; |
| 553 |
cp = strchr(cp2, ' '); |
| 554 |
if (!cp) |
| 555 |
return -EINVAL; |
| 556 |
*cp = '\0'; |
| 557 |
fs = cp2; |
| 558 |
flags = simple_strtoul(cp + 1, NULL, 0); |
| 559 |
return update_mount_acl(dev, dir, fs, flags, is_delete); |
| 560 |
} |
| 561 |
|
| 562 |
/** |
| 563 |
* ccs_read_mount_policy - Read "struct mount_entry" list. |
| 564 |
* |
| 565 |
* @head: Pointer to "struct ccs_io_buffer". |
| 566 |
* |
| 567 |
* Returns true on success, false otherwise. |
| 568 |
*/ |
| 569 |
bool ccs_read_mount_policy(struct ccs_io_buffer *head) |
| 570 |
{ |
| 571 |
struct list1_head *pos; |
| 572 |
list1_for_each_cookie(pos, head->read_var2, &mount_list) { |
| 573 |
struct mount_entry *ptr; |
| 574 |
ptr = list1_entry(pos, struct mount_entry, list); |
| 575 |
if (ptr->is_deleted) |
| 576 |
continue; |
| 577 |
if (!ccs_io_printf(head, KEYWORD_ALLOW_MOUNT "%s %s %s 0x%lX\n", |
| 578 |
ptr->dev_name->name, ptr->dir_name->name, |
| 579 |
ptr->fs_type->name, ptr->flags)) |
| 580 |
goto out; |
| 581 |
} |
| 582 |
return true; |
| 583 |
out: |
| 584 |
return false; |
| 585 |
} |
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