| 1 |
/* |
| 2 |
* fs/realpath.c |
| 3 |
* |
| 4 |
* Get the canonicalized absolute pathnames. The basis for SAKURA and TOMOYO. |
| 5 |
* |
| 6 |
* Copyright (C) 2005-2009 NTT DATA CORPORATION |
| 7 |
* |
| 8 |
* Version: 1.7.0-pre 2009/05/28 |
| 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 |
#include <linux/string.h> |
| 15 |
#include <linux/mm.h> |
| 16 |
#include <linux/utime.h> |
| 17 |
#include <linux/file.h> |
| 18 |
#include <linux/smp_lock.h> |
| 19 |
#include <linux/module.h> |
| 20 |
#include <linux/slab.h> |
| 21 |
#include <asm/uaccess.h> |
| 22 |
#include <asm/atomic.h> |
| 23 |
#include <linux/version.h> |
| 24 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
| 25 |
#include <linux/namei.h> |
| 26 |
#include <linux/mount.h> |
| 27 |
static const int ccs_lookup_flags = LOOKUP_FOLLOW; |
| 28 |
#else |
| 29 |
static const int ccs_lookup_flags = LOOKUP_FOLLOW | LOOKUP_POSITIVE; |
| 30 |
#endif |
| 31 |
#include <linux/proc_fs.h> |
| 32 |
#include <linux/ccs_common.h> |
| 33 |
#include <linux/realpath.h> |
| 34 |
#include <net/sock.h> |
| 35 |
|
| 36 |
/** |
| 37 |
* ccs_get_absolute_path - Get the path of a dentry but ignores chroot'ed root. |
| 38 |
* |
| 39 |
* @dentry: Pointer to "struct dentry". |
| 40 |
* @vfsmnt: Pointer to "struct vfsmount". |
| 41 |
* @buffer: Pointer to buffer to return value in. |
| 42 |
* @buflen: Sizeof @buffer. |
| 43 |
* |
| 44 |
* Returns 0 on success, -ENOMEM otherwise. |
| 45 |
* |
| 46 |
* Caller holds the dcache_lock and vfsmount_lock. |
| 47 |
* Based on __d_path() in fs/dcache.c |
| 48 |
* |
| 49 |
* If dentry is a directory, trailing '/' is appended. |
| 50 |
* Characters out of 0x20 < c < 0x7F range are converted to |
| 51 |
* \ooo style octal string. |
| 52 |
* Character \ is converted to \\ string. |
| 53 |
*/ |
| 54 |
static int ccs_get_absolute_path(struct dentry *dentry, struct vfsmount *vfsmnt, |
| 55 |
char *buffer, int buflen) |
| 56 |
{ |
| 57 |
/***** CRITICAL SECTION START *****/ |
| 58 |
char *start = buffer; |
| 59 |
char *end = buffer + buflen; |
| 60 |
bool is_dir = (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)); |
| 61 |
|
| 62 |
if (buflen < 256) |
| 63 |
goto out; |
| 64 |
|
| 65 |
*--end = '\0'; |
| 66 |
buflen--; |
| 67 |
|
| 68 |
for (;;) { |
| 69 |
struct dentry *parent; |
| 70 |
|
| 71 |
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) { |
| 72 |
/* Global root? */ |
| 73 |
if (vfsmnt->mnt_parent == vfsmnt) |
| 74 |
break; |
| 75 |
dentry = vfsmnt->mnt_mountpoint; |
| 76 |
vfsmnt = vfsmnt->mnt_parent; |
| 77 |
continue; |
| 78 |
} |
| 79 |
if (is_dir) { |
| 80 |
is_dir = false; |
| 81 |
*--end = '/'; |
| 82 |
buflen--; |
| 83 |
} |
| 84 |
parent = dentry->d_parent; |
| 85 |
{ |
| 86 |
const char *sp = dentry->d_name.name; |
| 87 |
const char *cp = sp + dentry->d_name.len - 1; |
| 88 |
unsigned char c; |
| 89 |
|
| 90 |
/* |
| 91 |
* Exception: Use /proc/self/ rather than |
| 92 |
* /proc/\$/ for current process. |
| 93 |
*/ |
| 94 |
if (IS_ROOT(parent) && *sp > '0' && *sp <= '9' && |
| 95 |
parent->d_sb && |
| 96 |
parent->d_sb->s_magic == PROC_SUPER_MAGIC) { |
| 97 |
char *ep; |
| 98 |
const pid_t pid |
| 99 |
= (pid_t) simple_strtoul(sp, &ep, 10); |
| 100 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
| 101 |
const pid_t tgid |
| 102 |
= task_tgid_nr_ns(current, |
| 103 |
dentry->d_sb-> |
| 104 |
s_fs_info); |
| 105 |
if (!*ep && pid == tgid && tgid) { |
| 106 |
sp = "self"; |
| 107 |
cp = sp + 3; |
| 108 |
} |
| 109 |
#else |
| 110 |
if (!*ep && pid == sys_getpid()) { |
| 111 |
sp = "self"; |
| 112 |
cp = sp + 3; |
| 113 |
} |
| 114 |
#endif |
| 115 |
} |
| 116 |
|
| 117 |
while (sp <= cp) { |
| 118 |
c = *(unsigned char *) cp; |
| 119 |
if (c == '\\') { |
| 120 |
buflen -= 2; |
| 121 |
if (buflen < 0) |
| 122 |
goto out; |
| 123 |
*--end = '\\'; |
| 124 |
*--end = '\\'; |
| 125 |
} else if (c > ' ' && c < 127) { |
| 126 |
if (--buflen < 0) |
| 127 |
goto out; |
| 128 |
*--end = (char) c; |
| 129 |
} else { |
| 130 |
buflen -= 4; |
| 131 |
if (buflen < 0) |
| 132 |
goto out; |
| 133 |
*--end = (c & 7) + '0'; |
| 134 |
*--end = ((c >> 3) & 7) + '0'; |
| 135 |
*--end = (c >> 6) + '0'; |
| 136 |
*--end = '\\'; |
| 137 |
} |
| 138 |
cp--; |
| 139 |
} |
| 140 |
if (--buflen < 0) |
| 141 |
goto out; |
| 142 |
*--end = '/'; |
| 143 |
} |
| 144 |
dentry = parent; |
| 145 |
} |
| 146 |
if (*end == '/') { |
| 147 |
buflen++; |
| 148 |
end++; |
| 149 |
} |
| 150 |
{ |
| 151 |
const char *sp = dentry->d_name.name; |
| 152 |
const char *cp = sp + dentry->d_name.len - 1; |
| 153 |
unsigned char c; |
| 154 |
while (sp <= cp) { |
| 155 |
c = *(unsigned char *) cp; |
| 156 |
if (c == '\\') { |
| 157 |
buflen -= 2; |
| 158 |
if (buflen < 0) |
| 159 |
goto out; |
| 160 |
*--end = '\\'; |
| 161 |
*--end = '\\'; |
| 162 |
} else if (c > ' ' && c < 127) { |
| 163 |
if (--buflen < 0) |
| 164 |
goto out; |
| 165 |
*--end = (char) c; |
| 166 |
} else { |
| 167 |
buflen -= 4; |
| 168 |
if (buflen < 0) |
| 169 |
goto out; |
| 170 |
*--end = (c & 7) + '0'; |
| 171 |
*--end = ((c >> 3) & 7) + '0'; |
| 172 |
*--end = (c >> 6) + '0'; |
| 173 |
*--end = '\\'; |
| 174 |
} |
| 175 |
cp--; |
| 176 |
} |
| 177 |
} |
| 178 |
/* Move the pathname to the top of the buffer. */ |
| 179 |
memmove(start, end, strlen(end) + 1); |
| 180 |
return 0; |
| 181 |
out: |
| 182 |
return -ENOMEM; |
| 183 |
/***** CRITICAL SECTION END *****/ |
| 184 |
} |
| 185 |
|
| 186 |
#define SOCKFS_MAGIC 0x534F434B |
| 187 |
|
| 188 |
/** |
| 189 |
* ccs_realpath_from_dentry2 - Returns realpath(3) of the given dentry but ignores chroot'ed root. |
| 190 |
* |
| 191 |
* @dentry: Pointer to "struct dentry". |
| 192 |
* @mnt: Pointer to "struct vfsmount". |
| 193 |
* @newname: Pointer to buffer to return value in. |
| 194 |
* @newname_len: Size of @newname. |
| 195 |
* |
| 196 |
* Returns 0 on success, negative value otherwise. |
| 197 |
*/ |
| 198 |
static int ccs_realpath_from_dentry2(struct dentry *dentry, |
| 199 |
struct vfsmount *mnt, |
| 200 |
char *newname, int newname_len) |
| 201 |
{ |
| 202 |
int error = -EINVAL; |
| 203 |
struct dentry *d_dentry; |
| 204 |
struct vfsmount *d_mnt; |
| 205 |
if (!dentry || !newname || newname_len <= 2048) |
| 206 |
goto out; |
| 207 |
/* Get better name for socket. */ |
| 208 |
if (dentry->d_sb && dentry->d_sb->s_magic == SOCKFS_MAGIC) { |
| 209 |
struct inode *inode = dentry->d_inode; |
| 210 |
struct socket *sock = inode ? SOCKET_I(inode) : NULL; |
| 211 |
struct sock *sk = sock ? sock->sk : NULL; |
| 212 |
if (sk) { |
| 213 |
snprintf(newname, newname_len - 1, |
| 214 |
"socket:[family=%u:type=%u:protocol=%u]", |
| 215 |
sk->sk_family, sk->sk_type, sk->sk_protocol); |
| 216 |
} else { |
| 217 |
snprintf(newname, newname_len - 1, "socket:[unknown]"); |
| 218 |
} |
| 219 |
return 0; |
| 220 |
} |
| 221 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 22) |
| 222 |
if (dentry->d_op && dentry->d_op->d_dname) { |
| 223 |
/* For "socket:[\$]" and "pipe:[\$]". */ |
| 224 |
static const int offset = 1536; |
| 225 |
char *dp = newname; |
| 226 |
char *sp = dentry->d_op->d_dname(dentry, newname + offset, |
| 227 |
newname_len - offset); |
| 228 |
if (IS_ERR(sp)) { |
| 229 |
error = PTR_ERR(sp); |
| 230 |
goto out; |
| 231 |
} |
| 232 |
error = -ENOMEM; |
| 233 |
newname += offset; |
| 234 |
while (1) { |
| 235 |
const unsigned char c = *(unsigned char *) sp++; |
| 236 |
if (c == '\\') { |
| 237 |
if (dp + 2 >= newname) |
| 238 |
break; |
| 239 |
*dp++ = '\\'; |
| 240 |
*dp++ = '\\'; |
| 241 |
} else if (c > ' ' && c < 127) { |
| 242 |
if (dp + 1 >= newname) |
| 243 |
break; |
| 244 |
*dp++ = (char) c; |
| 245 |
} else if (c) { |
| 246 |
if (dp + 4 >= newname) |
| 247 |
break; |
| 248 |
*dp++ = '\\'; |
| 249 |
*dp++ = (c >> 6) + '0'; |
| 250 |
*dp++ = ((c >> 3) & 7) + '0'; |
| 251 |
*dp++ = (c & 7) + '0'; |
| 252 |
} else { |
| 253 |
*dp = '\0'; |
| 254 |
return 0; |
| 255 |
} |
| 256 |
} |
| 257 |
goto out; |
| 258 |
} |
| 259 |
#endif |
| 260 |
if (!mnt) |
| 261 |
goto out; |
| 262 |
d_dentry = dget(dentry); |
| 263 |
d_mnt = mntget(mnt); |
| 264 |
/***** CRITICAL SECTION START *****/ |
| 265 |
ccs_realpath_lock(); |
| 266 |
error = ccs_get_absolute_path(d_dentry, d_mnt, newname, newname_len); |
| 267 |
ccs_realpath_unlock(); |
| 268 |
/***** CRITICAL SECTION END *****/ |
| 269 |
dput(d_dentry); |
| 270 |
mntput(d_mnt); |
| 271 |
out: |
| 272 |
if (error) |
| 273 |
printk(KERN_WARNING "ccs_realpath: Pathname too long. (%d)\n", |
| 274 |
error); |
| 275 |
return error; |
| 276 |
} |
| 277 |
|
| 278 |
/** |
| 279 |
* ccs_realpath_from_dentry - Returns realpath(3) of the given pathname but ignores chroot'ed root. |
| 280 |
* |
| 281 |
* @dentry: Pointer to "struct dentry". |
| 282 |
* @mnt: Pointer to "struct vfsmount". |
| 283 |
* |
| 284 |
* Returns the realpath of the given @dentry and @mnt on success, |
| 285 |
* NULL otherwise. |
| 286 |
* |
| 287 |
* These functions use kzalloc(), so caller must kfree() |
| 288 |
* if these functions didn't return NULL. |
| 289 |
*/ |
| 290 |
char *ccs_realpath_from_dentry(struct dentry *dentry, struct vfsmount *mnt) |
| 291 |
{ |
| 292 |
char *buf = kzalloc(CCS_MAX_PATHNAME_LEN, GFP_KERNEL); |
| 293 |
if (buf && ccs_realpath_from_dentry2(dentry, mnt, buf, |
| 294 |
CCS_MAX_PATHNAME_LEN - 2) == 0) |
| 295 |
return buf; |
| 296 |
kfree(buf); |
| 297 |
return NULL; |
| 298 |
} |
| 299 |
|
| 300 |
/** |
| 301 |
* ccs_realpath - Get realpath of a pathname. |
| 302 |
* |
| 303 |
* @pathname: The pathname to solve. |
| 304 |
* |
| 305 |
* Returns the realpath of @pathname on success, NULL otherwise. |
| 306 |
*/ |
| 307 |
char *ccs_realpath(const char *pathname) |
| 308 |
{ |
| 309 |
struct nameidata nd; |
| 310 |
if (pathname && path_lookup(pathname, ccs_lookup_flags, &nd) == 0) { |
| 311 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
| 312 |
char *buf = ccs_realpath_from_dentry(nd.path.dentry, |
| 313 |
nd.path.mnt); |
| 314 |
path_put(&nd.path); |
| 315 |
#else |
| 316 |
char *buf = ccs_realpath_from_dentry(nd.dentry, nd.mnt); |
| 317 |
path_release(&nd); |
| 318 |
#endif |
| 319 |
return buf; |
| 320 |
} |
| 321 |
return NULL; |
| 322 |
} |
| 323 |
|
| 324 |
/** |
| 325 |
* ccs_realpath_both - Get realpath of a pathname and symlink. |
| 326 |
* |
| 327 |
* @pathname: The pathname to solve. |
| 328 |
* @ee: Pointer to "struct ccs_execve_entry". |
| 329 |
* |
| 330 |
* Returns 0 on success, negative value otherwise. |
| 331 |
*/ |
| 332 |
int ccs_realpath_both(const char *pathname, struct ccs_execve_entry *ee) |
| 333 |
{ |
| 334 |
struct nameidata nd; |
| 335 |
int ret; |
| 336 |
bool is_symlink; |
| 337 |
if (!pathname || |
| 338 |
path_lookup(pathname, ccs_lookup_flags ^ LOOKUP_FOLLOW, &nd)) |
| 339 |
return -ENOENT; |
| 340 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
| 341 |
is_symlink = nd.path.dentry->d_inode && |
| 342 |
S_ISLNK(nd.path.dentry->d_inode->i_mode); |
| 343 |
ret = ccs_realpath_from_dentry2(nd.path.dentry, nd.path.mnt, |
| 344 |
ee->tmp, CCS_EXEC_TMPSIZE - 1); |
| 345 |
path_put(&nd.path); |
| 346 |
#else |
| 347 |
is_symlink = nd.dentry->d_inode && S_ISLNK(nd.dentry->d_inode->i_mode); |
| 348 |
ret = ccs_realpath_from_dentry2(nd.dentry, nd.mnt, ee->tmp, |
| 349 |
CCS_EXEC_TMPSIZE - 1); |
| 350 |
path_release(&nd); |
| 351 |
#endif |
| 352 |
if (ret) |
| 353 |
return -ENOMEM; |
| 354 |
if (strlen(ee->tmp) > CCS_MAX_PATHNAME_LEN - 1) |
| 355 |
return -ENOMEM; |
| 356 |
ee->program_path[CCS_MAX_PATHNAME_LEN - 1] = '\0'; |
| 357 |
if (!is_symlink) { |
| 358 |
strncpy(ee->program_path, ee->tmp, |
| 359 |
CCS_MAX_PATHNAME_LEN - 1); |
| 360 |
return 0; |
| 361 |
} |
| 362 |
if (path_lookup(pathname, ccs_lookup_flags, &nd)) |
| 363 |
return -ENOENT; |
| 364 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
| 365 |
ret = ccs_realpath_from_dentry2(nd.path.dentry, nd.path.mnt, |
| 366 |
ee->program_path, |
| 367 |
CCS_MAX_PATHNAME_LEN - 1); |
| 368 |
path_put(&nd.path); |
| 369 |
#else |
| 370 |
ret = ccs_realpath_from_dentry2(nd.dentry, nd.mnt, ee->program_path, |
| 371 |
CCS_MAX_PATHNAME_LEN - 1); |
| 372 |
path_release(&nd); |
| 373 |
#endif |
| 374 |
return ret ? -ENOMEM : 0; |
| 375 |
} |
| 376 |
|
| 377 |
/** |
| 378 |
* ccs_encode: Encode binary string to ascii string. |
| 379 |
* |
| 380 |
* @str: String in binary format. |
| 381 |
* |
| 382 |
* Returns pointer to @str in ascii format on success, NULL otherwise. |
| 383 |
* |
| 384 |
* This function uses kzalloc(), so caller must kfree() if this function |
| 385 |
* didn't return NULL. |
| 386 |
*/ |
| 387 |
char *ccs_encode(const char *str) |
| 388 |
{ |
| 389 |
int len = 0; |
| 390 |
const char *p = str; |
| 391 |
char *cp; |
| 392 |
char *cp0; |
| 393 |
if (!p) |
| 394 |
return NULL; |
| 395 |
while (*p) { |
| 396 |
const unsigned char c = *p++; |
| 397 |
if (c == '\\') |
| 398 |
len += 2; |
| 399 |
else if (c > ' ' && c < 127) |
| 400 |
len++; |
| 401 |
else |
| 402 |
len += 4; |
| 403 |
} |
| 404 |
len++; |
| 405 |
cp = kzalloc(len, GFP_KERNEL); |
| 406 |
if (!cp) |
| 407 |
return NULL; |
| 408 |
cp0 = cp; |
| 409 |
p = str; |
| 410 |
while (*p) { |
| 411 |
const unsigned char c = *p++; |
| 412 |
if (c == '\\') { |
| 413 |
*cp++ = '\\'; |
| 414 |
*cp++ = '\\'; |
| 415 |
} else if (c > ' ' && c < 127) { |
| 416 |
*cp++ = c; |
| 417 |
} else { |
| 418 |
*cp++ = '\\'; |
| 419 |
*cp++ = (c >> 6) + '0'; |
| 420 |
*cp++ = ((c >> 3) & 7) + '0'; |
| 421 |
*cp++ = (c & 7) + '0'; |
| 422 |
} |
| 423 |
} |
| 424 |
return cp0; |
| 425 |
} |
| 426 |
|
| 427 |
/** |
| 428 |
* ccs_round_up - Round up an integer so that the returned pointers are appropriately aligned. |
| 429 |
* |
| 430 |
* @size: Size in bytes. |
| 431 |
* |
| 432 |
* Returns rounded value of @size. |
| 433 |
* |
| 434 |
* FIXME: Are there more requirements that is needed for assigning value |
| 435 |
* atomically? |
| 436 |
*/ |
| 437 |
static inline unsigned int ccs_round_up(const unsigned int size) |
| 438 |
{ |
| 439 |
if (sizeof(void *) >= sizeof(long)) |
| 440 |
return ((size + sizeof(void *) - 1) |
| 441 |
/ sizeof(void *)) * sizeof(void *); |
| 442 |
else |
| 443 |
return ((size + sizeof(long) - 1) |
| 444 |
/ sizeof(long)) * sizeof(long); |
| 445 |
} |
| 446 |
|
| 447 |
static atomic_t ccs_allocated_memory_for_elements; |
| 448 |
static unsigned int ccs_quota_for_elements; |
| 449 |
|
| 450 |
/** |
| 451 |
* ccs_memory_ok - Check memory quota. |
| 452 |
* |
| 453 |
* @ptr: Pointer to allocated memory. |
| 454 |
* |
| 455 |
* Returns true if @ptr is not NULL and quota not exceeded, false otehrwise. |
| 456 |
*/ |
| 457 |
bool ccs_memory_ok(const void *ptr) |
| 458 |
{ |
| 459 |
const unsigned int len = ptr ? ksize(ptr) : 0; |
| 460 |
if (len && (!ccs_quota_for_elements || |
| 461 |
atomic_read(&ccs_allocated_memory_for_elements) + len |
| 462 |
<= ccs_quota_for_elements)) { |
| 463 |
atomic_add(len, &ccs_allocated_memory_for_elements); |
| 464 |
return true; |
| 465 |
} |
| 466 |
printk(KERN_WARNING "ERROR: Out of memory. (%s)\n", __func__); |
| 467 |
if (!ccs_policy_loaded) |
| 468 |
panic("MAC Initialization failed.\n"); |
| 469 |
return false; |
| 470 |
} |
| 471 |
|
| 472 |
/** |
| 473 |
* ccs_memory_free - Free memory for elements. |
| 474 |
* |
| 475 |
* @ptr: Pointer to allocated memory. |
| 476 |
* @size: Size of @ptr . |
| 477 |
*/ |
| 478 |
static void ccs_memory_free(const void *ptr, size_t size) |
| 479 |
{ |
| 480 |
atomic_sub(size, &ccs_allocated_memory_for_elements); |
| 481 |
kfree(ptr); |
| 482 |
} |
| 483 |
|
| 484 |
/** |
| 485 |
* ccs_put_path_group - Delete memory for "struct ccs_path_group_entry". |
| 486 |
* |
| 487 |
* @group: Pointer to "struct ccs_path_group_entry". |
| 488 |
*/ |
| 489 |
void ccs_put_path_group(struct ccs_path_group_entry *group) |
| 490 |
{ |
| 491 |
struct ccs_path_group_member *member; |
| 492 |
struct ccs_path_group_member *next_member; |
| 493 |
LIST_HEAD(q); |
| 494 |
bool can_delete_group = false; |
| 495 |
if (!group) |
| 496 |
return; |
| 497 |
mutex_lock(&ccs_policy_lock); |
| 498 |
if (atomic_dec_and_test(&group->users)) { |
| 499 |
list_for_each_entry_safe(member, next_member, |
| 500 |
&group->path_group_member_list, |
| 501 |
list) { |
| 502 |
if (!member->is_deleted) |
| 503 |
break; |
| 504 |
list_del(&member->list); |
| 505 |
list_add(&member->list, &q); |
| 506 |
} |
| 507 |
if (list_empty(&group->path_group_member_list)) { |
| 508 |
list_del(&group->list); |
| 509 |
can_delete_group = true; |
| 510 |
} |
| 511 |
} |
| 512 |
mutex_unlock(&ccs_policy_lock); |
| 513 |
list_for_each_entry_safe(member, next_member, &q, list) { |
| 514 |
list_del(&member->list); |
| 515 |
ccs_put_name(member->member_name); |
| 516 |
ccs_memory_free(member, sizeof(*member)); |
| 517 |
} |
| 518 |
if (can_delete_group) { |
| 519 |
ccs_put_name(group->group_name); |
| 520 |
ccs_memory_free(group, sizeof(*group)); |
| 521 |
} |
| 522 |
} |
| 523 |
|
| 524 |
/** |
| 525 |
* ccs_put_address_group - Delete memory for "struct ccs_address_group_entry". |
| 526 |
* |
| 527 |
* @group: Pointer to "struct ccs_address_group_entry". |
| 528 |
*/ |
| 529 |
void ccs_put_address_group(struct ccs_address_group_entry *group) |
| 530 |
{ |
| 531 |
struct ccs_address_group_member *member; |
| 532 |
struct ccs_address_group_member *next_member; |
| 533 |
LIST_HEAD(q); |
| 534 |
bool can_delete_group = false; |
| 535 |
if (!group) |
| 536 |
return; |
| 537 |
mutex_lock(&ccs_policy_lock); |
| 538 |
if (atomic_dec_and_test(&group->users)) { |
| 539 |
list_for_each_entry_safe(member, next_member, |
| 540 |
&group->address_group_member_list, |
| 541 |
list) { |
| 542 |
if (!member->is_deleted) |
| 543 |
break; |
| 544 |
list_del(&member->list); |
| 545 |
list_add(&member->list, &q); |
| 546 |
} |
| 547 |
if (list_empty(&group->address_group_member_list)) { |
| 548 |
list_del(&group->list); |
| 549 |
can_delete_group = true; |
| 550 |
} |
| 551 |
} |
| 552 |
mutex_unlock(&ccs_policy_lock); |
| 553 |
list_for_each_entry_safe(member, next_member, &q, list) { |
| 554 |
list_del(&member->list); |
| 555 |
if (member->is_ipv6) { |
| 556 |
ccs_put_ipv6_address(member->min.ipv6); |
| 557 |
ccs_put_ipv6_address(member->max.ipv6); |
| 558 |
} |
| 559 |
ccs_memory_free(member, sizeof(*member)); |
| 560 |
} |
| 561 |
if (can_delete_group) { |
| 562 |
ccs_put_name(group->group_name); |
| 563 |
ccs_memory_free(group, sizeof(*group)); |
| 564 |
} |
| 565 |
} |
| 566 |
|
| 567 |
static LIST_HEAD(ccs_address_list); |
| 568 |
|
| 569 |
/** |
| 570 |
* ccs_get_ipv6_address - Keep the given IPv6 address on the RAM. |
| 571 |
* |
| 572 |
* @addr: Pointer to "struct in6_addr". |
| 573 |
* |
| 574 |
* Returns pointer to "struct in6_addr" on success, NULL otherwise. |
| 575 |
* |
| 576 |
* The RAM is shared, so NEVER try to modify or kfree() the returned address. |
| 577 |
*/ |
| 578 |
const struct in6_addr *ccs_get_ipv6_address(const struct in6_addr *addr) |
| 579 |
{ |
| 580 |
struct ccs_ipv6addr_entry *entry; |
| 581 |
struct ccs_ipv6addr_entry *ptr; |
| 582 |
int error = -ENOMEM; |
| 583 |
if (!addr) |
| 584 |
return NULL; |
| 585 |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
| 586 |
mutex_lock(&ccs_policy_lock); |
| 587 |
list_for_each_entry(ptr, &ccs_address_list, list) { |
| 588 |
if (memcmp(&ptr->addr, addr, sizeof(*addr))) |
| 589 |
continue; |
| 590 |
atomic_inc(&ptr->users); |
| 591 |
error = 0; |
| 592 |
break; |
| 593 |
} |
| 594 |
if (error && ccs_memory_ok(entry)) { |
| 595 |
ptr = entry; |
| 596 |
ptr->addr = *addr; |
| 597 |
atomic_set(&ptr->users, 1); |
| 598 |
list_add_tail(&ptr->list, &ccs_address_list); |
| 599 |
entry = NULL; |
| 600 |
} |
| 601 |
mutex_unlock(&ccs_policy_lock); |
| 602 |
kfree(entry); |
| 603 |
return ptr ? &ptr->addr : NULL; |
| 604 |
} |
| 605 |
|
| 606 |
/** |
| 607 |
* ccs_put_ipv6_address - Delete the given IPv6 address on the RAM. |
| 608 |
* |
| 609 |
* @addr: Pointer to "struct in6_addr". |
| 610 |
*/ |
| 611 |
void ccs_put_ipv6_address(const struct in6_addr *addr) |
| 612 |
{ |
| 613 |
struct ccs_ipv6addr_entry *ptr; |
| 614 |
bool can_delete = false; |
| 615 |
if (!addr) |
| 616 |
return; |
| 617 |
ptr = container_of(addr, struct ccs_ipv6addr_entry, addr); |
| 618 |
mutex_lock(&ccs_policy_lock); |
| 619 |
if (atomic_dec_and_test(&ptr->users)) { |
| 620 |
list_del(&ptr->list); |
| 621 |
can_delete = true; |
| 622 |
} |
| 623 |
mutex_unlock(&ccs_policy_lock); |
| 624 |
if (can_delete) |
| 625 |
ccs_memory_free(ptr, sizeof(*ptr)); |
| 626 |
} |
| 627 |
|
| 628 |
/** |
| 629 |
* ccs_put_condition - Delete memory for "struct ccs_condition". |
| 630 |
* |
| 631 |
* @cond: Pointer to "struct ccs_condition". |
| 632 |
*/ |
| 633 |
void ccs_put_condition(struct ccs_condition *cond) |
| 634 |
{ |
| 635 |
const unsigned long *ptr; |
| 636 |
const struct ccs_argv_entry *argv; |
| 637 |
const struct ccs_envp_entry *envp; |
| 638 |
const struct ccs_symlinkp_entry *symlinkp; |
| 639 |
u16 condc; |
| 640 |
u16 argc; |
| 641 |
u16 envc; |
| 642 |
u16 symlinkc; |
| 643 |
u16 i; |
| 644 |
bool can_delete = false; |
| 645 |
if (!cond) |
| 646 |
return; |
| 647 |
mutex_lock(&ccs_policy_lock); |
| 648 |
if (atomic_dec_and_test(&cond->users)) { |
| 649 |
list_del(&cond->list); |
| 650 |
can_delete = true; |
| 651 |
} |
| 652 |
mutex_unlock(&ccs_policy_lock); |
| 653 |
if (!can_delete) |
| 654 |
return; |
| 655 |
condc = cond->condc; |
| 656 |
argc = cond->argc; |
| 657 |
envc = cond->envc; |
| 658 |
symlinkc = cond->symlinkc; |
| 659 |
ptr = (const unsigned long *) (cond + 1); |
| 660 |
argv = (const struct ccs_argv_entry *) (ptr + condc); |
| 661 |
envp = (const struct ccs_envp_entry *) (argv + argc); |
| 662 |
symlinkp = (const struct ccs_symlinkp_entry *) (envp + envc); |
| 663 |
for (i = 0; i < argc; argv++, i++) |
| 664 |
ccs_put_name(argv->value); |
| 665 |
for (i = 0; i < envc; envp++, i++) { |
| 666 |
ccs_put_name(envp->name); |
| 667 |
ccs_put_name(envp->value); |
| 668 |
} |
| 669 |
for (i = 0; i < symlinkc; symlinkp++, i++) |
| 670 |
ccs_put_name(symlinkp->value); |
| 671 |
ccs_memory_free(cond, ksize(cond)); |
| 672 |
} |
| 673 |
|
| 674 |
static atomic_t ccs_allocated_memory_for_savename; |
| 675 |
static unsigned int ccs_quota_for_savename; |
| 676 |
|
| 677 |
#define MAX_HASH 256 |
| 678 |
|
| 679 |
/* Structure for string data. */ |
| 680 |
struct ccs_name_entry { |
| 681 |
struct list_head list; |
| 682 |
atomic_t users; |
| 683 |
struct ccs_path_info entry; |
| 684 |
}; |
| 685 |
|
| 686 |
/* The list for "struct ccs_name_entry". */ |
| 687 |
static struct list_head ccs_name_list[MAX_HASH]; |
| 688 |
static DEFINE_MUTEX(ccs_name_list_lock); |
| 689 |
|
| 690 |
/** |
| 691 |
* ccs_get_name - Allocate memory for string data. |
| 692 |
* |
| 693 |
* @name: The string to store into the permernent memory. |
| 694 |
* |
| 695 |
* Returns pointer to "struct ccs_path_info" on success, NULL otherwise. |
| 696 |
*/ |
| 697 |
const struct ccs_path_info *ccs_get_name(const char *name) |
| 698 |
{ |
| 699 |
struct ccs_name_entry *ptr; |
| 700 |
unsigned int hash; |
| 701 |
int len; |
| 702 |
int allocated_len; |
| 703 |
|
| 704 |
if (!name) |
| 705 |
return NULL; |
| 706 |
len = strlen(name) + 1; |
| 707 |
if (len > CCS_MAX_PATHNAME_LEN) { |
| 708 |
printk(KERN_WARNING "ERROR: Name too long. (%s)\n", __func__); |
| 709 |
return NULL; |
| 710 |
} |
| 711 |
hash = full_name_hash((const unsigned char *) name, len - 1); |
| 712 |
/***** EXCLUSIVE SECTION START *****/ |
| 713 |
mutex_lock(&ccs_name_list_lock); |
| 714 |
list_for_each_entry(ptr, &ccs_name_list[hash % MAX_HASH], list) { |
| 715 |
if (hash != ptr->entry.hash || strcmp(name, ptr->entry.name)) |
| 716 |
continue; |
| 717 |
atomic_inc(&ptr->users); |
| 718 |
goto out; |
| 719 |
} |
| 720 |
ptr = kzalloc(sizeof(*ptr) + len, GFP_KERNEL); |
| 721 |
allocated_len = ptr ? ksize(ptr) : 0; |
| 722 |
if (!allocated_len || |
| 723 |
(ccs_quota_for_savename && |
| 724 |
atomic_read(&ccs_allocated_memory_for_savename) + allocated_len |
| 725 |
> ccs_quota_for_savename)) { |
| 726 |
kfree(ptr); |
| 727 |
ptr = NULL; |
| 728 |
printk(KERN_WARNING "ERROR: Out of memory. (%s)\n", __func__); |
| 729 |
if (!ccs_policy_loaded) |
| 730 |
panic("MAC Initialization failed.\n"); |
| 731 |
goto out; |
| 732 |
} |
| 733 |
atomic_add(allocated_len, &ccs_allocated_memory_for_savename); |
| 734 |
ptr->entry.name = ((char *) ptr) + sizeof(*ptr); |
| 735 |
memmove((char *) ptr->entry.name, name, len); |
| 736 |
atomic_set(&ptr->users, 1); |
| 737 |
ccs_fill_path_info(&ptr->entry); |
| 738 |
list_add_tail(&ptr->list, &ccs_name_list[hash % MAX_HASH]); |
| 739 |
out: |
| 740 |
mutex_unlock(&ccs_name_list_lock); |
| 741 |
/***** EXCLUSIVE SECTION END *****/ |
| 742 |
return ptr ? &ptr->entry : NULL; |
| 743 |
} |
| 744 |
|
| 745 |
/** |
| 746 |
* ccs_put_name - Delete shared memory for string data. |
| 747 |
* |
| 748 |
* @name: Pointer to "struct ccs_path_info". |
| 749 |
*/ |
| 750 |
void ccs_put_name(const struct ccs_path_info *name) |
| 751 |
{ |
| 752 |
struct ccs_name_entry *ptr; |
| 753 |
bool can_delete = false; |
| 754 |
if (!name) |
| 755 |
return; |
| 756 |
ptr = container_of(name, struct ccs_name_entry, entry); |
| 757 |
/***** EXCLUSIVE SECTION START *****/ |
| 758 |
mutex_lock(&ccs_name_list_lock); |
| 759 |
if (atomic_dec_and_test(&ptr->users)) { |
| 760 |
list_del(&ptr->list); |
| 761 |
can_delete = true; |
| 762 |
} |
| 763 |
mutex_unlock(&ccs_name_list_lock); |
| 764 |
/***** EXCLUSIVE SECTION END *****/ |
| 765 |
if (can_delete) { |
| 766 |
atomic_sub(ksize(ptr), &ccs_allocated_memory_for_savename); |
| 767 |
kfree(ptr); |
| 768 |
} |
| 769 |
} |
| 770 |
|
| 771 |
struct srcu_struct ccs_ss; |
| 772 |
|
| 773 |
/** |
| 774 |
* ccs_realpath_init - Initialize realpath related code. |
| 775 |
* |
| 776 |
* Returns 0. |
| 777 |
*/ |
| 778 |
static int __init ccs_realpath_init(void) |
| 779 |
{ |
| 780 |
int i; |
| 781 |
/* Constraint for ccs_get_name(). */ |
| 782 |
if (CCS_MAX_PATHNAME_LEN > PAGE_SIZE) |
| 783 |
panic("Bad size."); |
| 784 |
/* Constraint for "struct ccs_execve_entry"->tmp users. */ |
| 785 |
if (CCS_MAX_PATHNAME_LEN > CCS_EXEC_TMPSIZE) |
| 786 |
panic("Bad size."); |
| 787 |
if (init_srcu_struct(&ccs_ss)) |
| 788 |
panic("Out of memory."); |
| 789 |
for (i = 0; i < MAX_HASH; i++) |
| 790 |
INIT_LIST_HEAD(&ccs_name_list[i]); |
| 791 |
INIT_LIST_HEAD(&ccs_kernel_domain.acl_info_list); |
| 792 |
ccs_kernel_domain.domainname = ccs_get_name(ROOT_NAME); |
| 793 |
list_add_tail_rcu(&ccs_kernel_domain.list, &ccs_domain_list); |
| 794 |
if (ccs_find_domain(ROOT_NAME) != &ccs_kernel_domain) |
| 795 |
panic("Can't register ccs_kernel_domain"); |
| 796 |
#ifdef CONFIG_CCSECURITY_BUILTIN_INITIALIZERS |
| 797 |
{ |
| 798 |
/* Load built-in policy. */ |
| 799 |
static char ccs_builtin_initializers[] __initdata |
| 800 |
= CONFIG_CCSECURITY_BUILTIN_INITIALIZERS; |
| 801 |
char *cp = ccs_builtin_initializers; |
| 802 |
ccs_normalize_line(cp); |
| 803 |
while (cp && *cp) { |
| 804 |
char *cp2 = strchr(cp, ' '); |
| 805 |
if (cp2) |
| 806 |
*cp2++ = '\0'; |
| 807 |
ccs_write_domain_initializer_policy(cp, false, false); |
| 808 |
cp = cp2; |
| 809 |
} |
| 810 |
} |
| 811 |
#endif |
| 812 |
return 0; |
| 813 |
} |
| 814 |
|
| 815 |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0) |
| 816 |
__initcall(ccs_realpath_init); |
| 817 |
#else |
| 818 |
core_initcall(ccs_realpath_init); |
| 819 |
#endif |
| 820 |
|
| 821 |
unsigned int ccs_audit_log_memory_size; |
| 822 |
unsigned int ccs_quota_for_audit_log; |
| 823 |
|
| 824 |
unsigned int ccs_query_memory_size; |
| 825 |
unsigned int ccs_quota_for_query; |
| 826 |
|
| 827 |
/** |
| 828 |
* ccs_read_memory_counter - Check for memory usage. |
| 829 |
* |
| 830 |
* @head: Pointer to "struct ccs_io_buffer". |
| 831 |
* |
| 832 |
* Returns memory usage. |
| 833 |
*/ |
| 834 |
int ccs_read_memory_counter(struct ccs_io_buffer *head) |
| 835 |
{ |
| 836 |
if (!head->read_eof) { |
| 837 |
const unsigned int shared |
| 838 |
= atomic_read(&ccs_allocated_memory_for_savename); |
| 839 |
const unsigned int private |
| 840 |
= atomic_read(&ccs_allocated_memory_for_elements); |
| 841 |
const unsigned int audit_log = ccs_audit_log_memory_size; |
| 842 |
const unsigned int query = ccs_query_memory_size; |
| 843 |
char buffer[64]; |
| 844 |
memset(buffer, 0, sizeof(buffer)); |
| 845 |
if (ccs_quota_for_savename) |
| 846 |
snprintf(buffer, sizeof(buffer) - 1, |
| 847 |
" (Quota: %10u)", ccs_quota_for_savename); |
| 848 |
else |
| 849 |
buffer[0] = '\0'; |
| 850 |
ccs_io_printf(head, "Policy (string): %10u%s\n", |
| 851 |
shared, buffer); |
| 852 |
if (ccs_quota_for_elements) |
| 853 |
snprintf(buffer, sizeof(buffer) - 1, |
| 854 |
" (Quota: %10u)", ccs_quota_for_elements); |
| 855 |
else |
| 856 |
buffer[0] = '\0'; |
| 857 |
ccs_io_printf(head, "Policy (non-string): %10u%s\n", |
| 858 |
private, buffer); |
| 859 |
if (ccs_quota_for_audit_log) |
| 860 |
snprintf(buffer, sizeof(buffer) - 1, |
| 861 |
" (Quota: %10u)", ccs_quota_for_audit_log); |
| 862 |
else |
| 863 |
buffer[0] = '\0'; |
| 864 |
ccs_io_printf(head, "Audit logs: %10u%s\n", |
| 865 |
audit_log, buffer); |
| 866 |
if (ccs_quota_for_query) |
| 867 |
snprintf(buffer, sizeof(buffer) - 1, |
| 868 |
" (Quota: %10u)", ccs_quota_for_query); |
| 869 |
else |
| 870 |
buffer[0] = '\0'; |
| 871 |
ccs_io_printf(head, "Interactive enforcement: %10u%s\n", |
| 872 |
query, buffer); |
| 873 |
ccs_io_printf(head, "Total: %10u\n", |
| 874 |
shared + private + audit_log + query); |
| 875 |
head->read_eof = true; |
| 876 |
} |
| 877 |
return 0; |
| 878 |
} |
| 879 |
|
| 880 |
/** |
| 881 |
* ccs_write_memory_quota - Set memory quota. |
| 882 |
* |
| 883 |
* @head: Pointer to "struct ccs_io_buffer". |
| 884 |
* |
| 885 |
* Returns 0. |
| 886 |
*/ |
| 887 |
int ccs_write_memory_quota(struct ccs_io_buffer *head) |
| 888 |
{ |
| 889 |
char *data = head->write_buf; |
| 890 |
unsigned int size; |
| 891 |
if (sscanf(data, "Policy (string): %u", &size) == 1) |
| 892 |
ccs_quota_for_savename = size; |
| 893 |
else if (sscanf(data, "Policy (non-string): %u", &size) == 1) |
| 894 |
ccs_quota_for_elements = size; |
| 895 |
else if (sscanf(data, "Audit logs: %u", &size) == 1) |
| 896 |
ccs_quota_for_audit_log = size; |
| 897 |
else if (sscanf(data, "Interactive enforcement: %u", &size) == 1) |
| 898 |
ccs_quota_for_query = size; |
| 899 |
return 0; |
| 900 |
} |
| 901 |
|
| 902 |
/* Garbage collector functions */ |
| 903 |
|
| 904 |
enum ccs_gc_id { |
| 905 |
CCS_ID_CONDITION, |
| 906 |
CCS_ID_RESERVEDPORT, |
| 907 |
CCS_ID_ADDRESS_GROUP, |
| 908 |
CCS_ID_ADDRESS_GROUP_MEMBER, |
| 909 |
CCS_ID_PATH_GROUP, |
| 910 |
CCS_ID_PATH_GROUP_MEMBER, |
| 911 |
CCS_ID_GLOBAL_ENV, |
| 912 |
CCS_ID_AGGREGATOR, |
| 913 |
CCS_ID_DOMAIN_INITIALIZER, |
| 914 |
CCS_ID_DOMAIN_KEEPER, |
| 915 |
CCS_ID_ALIAS, |
| 916 |
CCS_ID_GLOBALLY_READABLE, |
| 917 |
CCS_ID_PATTERN, |
| 918 |
CCS_ID_NO_REWRITE, |
| 919 |
CCS_ID_MANAGER, |
| 920 |
CCS_ID_ACL, |
| 921 |
CCS_ID_DOMAIN |
| 922 |
}; |
| 923 |
|
| 924 |
struct ccs_gc_entry { |
| 925 |
struct list_head list; |
| 926 |
int type; |
| 927 |
void *element; |
| 928 |
}; |
| 929 |
|
| 930 |
/* Caller holds ccs_policy_lock mutex. */ |
| 931 |
static bool ccs_add_to_gc(const int type, void *element, struct list_head *head) |
| 932 |
{ |
| 933 |
struct ccs_gc_entry *entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
| 934 |
if (!entry) |
| 935 |
return false; |
| 936 |
entry->type = type; |
| 937 |
entry->element = element; |
| 938 |
list_add(&entry->list, head); |
| 939 |
return true; |
| 940 |
} |
| 941 |
|
| 942 |
static inline void ccs_gc_del_domain_initializer |
| 943 |
(struct ccs_domain_initializer_entry *ptr) |
| 944 |
{ |
| 945 |
ccs_put_name(ptr->domainname); |
| 946 |
ccs_put_name(ptr->program); |
| 947 |
} |
| 948 |
|
| 949 |
static inline void ccs_gc_del_domain_keeper |
| 950 |
(struct ccs_domain_keeper_entry *ptr) |
| 951 |
{ |
| 952 |
ccs_put_name(ptr->domainname); |
| 953 |
ccs_put_name(ptr->program); |
| 954 |
} |
| 955 |
|
| 956 |
static void ccs_del_allow_read(struct ccs_globally_readable_file_entry *ptr) |
| 957 |
{ |
| 958 |
ccs_put_name(ptr->filename); |
| 959 |
ccs_memory_free(ptr, sizeof(*ptr)); |
| 960 |
} |
| 961 |
|
| 962 |
static void ccs_del_allow_env(struct ccs_globally_usable_env_entry *ptr) |
| 963 |
{ |
| 964 |
ccs_put_name(ptr->env); |
| 965 |
ccs_memory_free(ptr, sizeof(*ptr)); |
| 966 |
} |
| 967 |
|
| 968 |
static void ccs_del_file_pattern(struct ccs_pattern_entry *ptr) |
| 969 |
{ |
| 970 |
ccs_put_name(ptr->pattern); |
| 971 |
ccs_memory_free(ptr, sizeof(*ptr)); |
| 972 |
} |
| 973 |
|
| 974 |
static void ccs_del_no_rewrite(struct ccs_no_rewrite_entry *ptr) |
| 975 |
{ |
| 976 |
ccs_put_name(ptr->pattern); |
| 977 |
ccs_memory_free(ptr, sizeof(*ptr)); |
| 978 |
} |
| 979 |
|
| 980 |
static void ccs_del_domain_initializer(struct ccs_domain_initializer_entry *ptr) |
| 981 |
{ |
| 982 |
ccs_put_name(ptr->domainname); |
| 983 |
ccs_put_name(ptr->program); |
| 984 |
ccs_memory_free(ptr, sizeof(*ptr)); |
| 985 |
} |
| 986 |
|
| 987 |
static void ccs_del_domain_keeper(struct ccs_domain_keeper_entry *ptr) |
| 988 |
{ |
| 989 |
ccs_put_name(ptr->domainname); |
| 990 |
ccs_put_name(ptr->program); |
| 991 |
ccs_memory_free(ptr, sizeof(*ptr)); |
| 992 |
} |
| 993 |
|
| 994 |
static void ccs_del_alias(struct ccs_alias_entry *ptr) |
| 995 |
{ |
| 996 |
ccs_put_name(ptr->original_name); |
| 997 |
ccs_put_name(ptr->aliased_name); |
| 998 |
ccs_memory_free(ptr, sizeof(*ptr)); |
| 999 |
} |
| 1000 |
|
| 1001 |
static void ccs_del_aggregator(struct ccs_aggregator_entry *ptr) |
| 1002 |
{ |
| 1003 |
ccs_put_name(ptr->original_name); |
| 1004 |
ccs_put_name(ptr->aggregated_name); |
| 1005 |
ccs_memory_free(ptr, sizeof(*ptr)); |
| 1006 |
} |
| 1007 |
|
| 1008 |
static void ccs_del_manager(struct ccs_policy_manager_entry *ptr) |
| 1009 |
{ |
| 1010 |
ccs_put_name(ptr->manager); |
| 1011 |
ccs_memory_free(ptr, sizeof(*ptr)); |
| 1012 |
} |
| 1013 |
|
| 1014 |
/* For compatibility with older kernels. */ |
| 1015 |
#ifndef for_each_process |
| 1016 |
#define for_each_process for_each_task |
| 1017 |
#endif |
| 1018 |
|
| 1019 |
/** |
| 1020 |
* ccs_used_by_task - Check whether the given pointer is referenced by a task. |
| 1021 |
* |
| 1022 |
* @domain: Pointer to "struct ccs_domain_info". |
| 1023 |
* |
| 1024 |
* Returns true if @ptr is in use, false otherwise. |
| 1025 |
*/ |
| 1026 |
static bool ccs_used_by_task(struct ccs_domain_info *domain) |
| 1027 |
{ |
| 1028 |
bool in_use = false; |
| 1029 |
struct task_struct *p; |
| 1030 |
/***** CRITICAL SECTION START *****/ |
| 1031 |
read_lock(&tasklist_lock); |
| 1032 |
for_each_process(p) { |
| 1033 |
if (p->ccs_domain_info != domain) |
| 1034 |
continue; |
| 1035 |
in_use = true; |
| 1036 |
break; |
| 1037 |
} |
| 1038 |
read_unlock(&tasklist_lock); |
| 1039 |
/***** CRITICAL SECTION END *****/ |
| 1040 |
return in_use; |
| 1041 |
} |
| 1042 |
|
| 1043 |
static void ccs_del_acl(struct ccs_acl_info *acl) |
| 1044 |
{ |
| 1045 |
size_t size; |
| 1046 |
ccs_put_condition(acl->cond); |
| 1047 |
switch (ccs_acl_type1(acl)) { |
| 1048 |
case TYPE_SINGLE_PATH_ACL: |
| 1049 |
{ |
| 1050 |
struct ccs_single_path_acl_record *entry; |
| 1051 |
size = sizeof(*entry); |
| 1052 |
entry = container_of(acl, typeof(*entry), head); |
| 1053 |
if (entry->u_is_group) |
| 1054 |
ccs_put_path_group(entry->u.group); |
| 1055 |
else |
| 1056 |
ccs_put_name(entry->u.filename); |
| 1057 |
} |
| 1058 |
break; |
| 1059 |
case TYPE_DOUBLE_PATH_ACL: |
| 1060 |
{ |
| 1061 |
struct ccs_double_path_acl_record *entry; |
| 1062 |
size = sizeof(*entry); |
| 1063 |
entry = container_of(acl, typeof(*entry), head); |
| 1064 |
if (entry->u1_is_group) |
| 1065 |
ccs_put_path_group(entry->u1.group1); |
| 1066 |
else |
| 1067 |
ccs_put_name(entry->u1.filename1); |
| 1068 |
if (entry->u2_is_group) |
| 1069 |
ccs_put_path_group(entry->u2.group2); |
| 1070 |
else |
| 1071 |
ccs_put_name(entry->u2.filename2); |
| 1072 |
} |
| 1073 |
break; |
| 1074 |
case TYPE_IP_NETWORK_ACL: |
| 1075 |
{ |
| 1076 |
struct ccs_ip_network_acl_record *entry; |
| 1077 |
size = sizeof(*entry); |
| 1078 |
entry = container_of(acl, typeof(*entry), head); |
| 1079 |
if (entry->record_type == IP_RECORD_TYPE_ADDRESS_GROUP) |
| 1080 |
ccs_put_address_group(entry->u.group); |
| 1081 |
else if (entry->record_type == IP_RECORD_TYPE_IPv6) { |
| 1082 |
ccs_put_ipv6_address(entry->u.ipv6.min); |
| 1083 |
ccs_put_ipv6_address(entry->u.ipv6.max); |
| 1084 |
} |
| 1085 |
} |
| 1086 |
break; |
| 1087 |
case TYPE_IOCTL_ACL: |
| 1088 |
{ |
| 1089 |
struct ccs_ioctl_acl_record *entry; |
| 1090 |
size = sizeof(*entry); |
| 1091 |
entry = container_of(acl, typeof(*entry), head); |
| 1092 |
if (entry->u_is_group) |
| 1093 |
ccs_put_path_group(entry->u.group); |
| 1094 |
else |
| 1095 |
ccs_put_name(entry->u.filename); |
| 1096 |
} |
| 1097 |
break; |
| 1098 |
case TYPE_ARGV0_ACL: |
| 1099 |
{ |
| 1100 |
struct ccs_argv0_acl_record *entry; |
| 1101 |
size = sizeof(*entry); |
| 1102 |
entry = container_of(acl, typeof(*entry), head); |
| 1103 |
ccs_put_name(entry->argv0); |
| 1104 |
} |
| 1105 |
break; |
| 1106 |
case TYPE_ENV_ACL: |
| 1107 |
{ |
| 1108 |
struct ccs_env_acl_record *entry; |
| 1109 |
size = sizeof(*entry); |
| 1110 |
entry = container_of(acl, typeof(*entry), head); |
| 1111 |
ccs_put_name(entry->env); |
| 1112 |
} |
| 1113 |
break; |
| 1114 |
case TYPE_CAPABILITY_ACL: |
| 1115 |
{ |
| 1116 |
struct ccs_capability_acl_record *entry; |
| 1117 |
size = sizeof(*entry); |
| 1118 |
entry = container_of(acl, typeof(*entry), head); |
| 1119 |
} |
| 1120 |
break; |
| 1121 |
case TYPE_SIGNAL_ACL: |
| 1122 |
{ |
| 1123 |
struct ccs_signal_acl_record *entry; |
| 1124 |
size = sizeof(*entry); |
| 1125 |
entry = container_of(acl, typeof(*entry), head); |
| 1126 |
ccs_put_name(entry->domainname); |
| 1127 |
} |
| 1128 |
break; |
| 1129 |
case TYPE_EXECUTE_HANDLER: |
| 1130 |
case TYPE_DENIED_EXECUTE_HANDLER: |
| 1131 |
{ |
| 1132 |
struct ccs_execute_handler_record *entry; |
| 1133 |
size = sizeof(*entry); |
| 1134 |
entry = container_of(acl, typeof(*entry), head); |
| 1135 |
ccs_put_name(entry->handler); |
| 1136 |
} |
| 1137 |
break; |
| 1138 |
case TYPE_MOUNT_ACL: |
| 1139 |
{ |
| 1140 |
struct ccs_mount_acl_record *entry; |
| 1141 |
size = sizeof(*entry); |
| 1142 |
entry = container_of(acl, typeof(*entry), head); |
| 1143 |
ccs_put_name(entry->dev_name); |
| 1144 |
ccs_put_name(entry->dir_name); |
| 1145 |
ccs_put_name(entry->fs_type); |
| 1146 |
} |
| 1147 |
break; |
| 1148 |
case TYPE_UMOUNT_ACL: |
| 1149 |
{ |
| 1150 |
struct ccs_umount_acl_record *entry; |
| 1151 |
size = sizeof(*entry); |
| 1152 |
entry = container_of(acl, typeof(*entry), head); |
| 1153 |
ccs_put_name(entry->dir); |
| 1154 |
} |
| 1155 |
break; |
| 1156 |
case TYPE_CHROOT_ACL: |
| 1157 |
{ |
| 1158 |
struct ccs_chroot_acl_record *entry; |
| 1159 |
size = sizeof(*entry); |
| 1160 |
entry = container_of(acl, typeof(*entry), head); |
| 1161 |
ccs_put_name(entry->dir); |
| 1162 |
} |
| 1163 |
break; |
| 1164 |
case TYPE_PIVOT_ROOT_ACL: |
| 1165 |
{ |
| 1166 |
struct ccs_pivot_root_acl_record *entry; |
| 1167 |
size = sizeof(*entry); |
| 1168 |
entry = container_of(acl, typeof(*entry), head); |
| 1169 |
ccs_put_name(entry->old_root); |
| 1170 |
ccs_put_name(entry->new_root); |
| 1171 |
} |
| 1172 |
break; |
| 1173 |
default: |
| 1174 |
size = 0; |
| 1175 |
printk(KERN_WARNING "Unknown type\n"); |
| 1176 |
break; |
| 1177 |
} |
| 1178 |
ccs_memory_free(acl, size); |
| 1179 |
} |
| 1180 |
|
| 1181 |
static bool ccs_del_domain(struct ccs_domain_info *domain) |
| 1182 |
{ |
| 1183 |
if (ccs_used_by_task(domain)) |
| 1184 |
return false; |
| 1185 |
ccs_put_name(domain->domainname); |
| 1186 |
ccs_memory_free(domain, sizeof(*domain)); |
| 1187 |
return true; |
| 1188 |
} |
| 1189 |
|
| 1190 |
static void ccs_del_path_group_member(struct ccs_path_group_member *member) |
| 1191 |
{ |
| 1192 |
ccs_put_name(member->member_name); |
| 1193 |
ccs_memory_free(member, sizeof(*member)); |
| 1194 |
} |
| 1195 |
|
| 1196 |
static void ccs_del_path_group(struct ccs_path_group_entry *group) |
| 1197 |
{ |
| 1198 |
ccs_put_name(group->group_name); |
| 1199 |
ccs_memory_free(group, sizeof(*group)); |
| 1200 |
} |
| 1201 |
|
| 1202 |
static void ccs_del_address_group_member |
| 1203 |
(struct ccs_address_group_member *member) |
| 1204 |
{ |
| 1205 |
if (member->is_ipv6) { |
| 1206 |
ccs_put_ipv6_address(member->min.ipv6); |
| 1207 |
ccs_put_ipv6_address(member->max.ipv6); |
| 1208 |
} |
| 1209 |
ccs_memory_free(member, sizeof(*member)); |
| 1210 |
} |
| 1211 |
|
| 1212 |
static void ccs_del_address_group(struct ccs_address_group_entry *group) |
| 1213 |
{ |
| 1214 |
ccs_put_name(group->group_name); |
| 1215 |
ccs_memory_free(group, sizeof(*group)); |
| 1216 |
} |
| 1217 |
|
| 1218 |
static void ccs_del_reservedport(struct ccs_reserved_entry *ptr) |
| 1219 |
{ |
| 1220 |
ccs_memory_free(ptr, sizeof(*ptr)); |
| 1221 |
} |
| 1222 |
|
| 1223 |
static void ccs_del_condition(struct ccs_condition *ptr) |
| 1224 |
{ |
| 1225 |
int i; |
| 1226 |
u16 condc = ptr->condc; |
| 1227 |
u16 argc = ptr->argc; |
| 1228 |
u16 envc = ptr->envc; |
| 1229 |
u16 symlinkc = ptr->symlinkc; |
| 1230 |
unsigned long *ptr2 = (unsigned long *) (ptr + 1); |
| 1231 |
struct ccs_argv_entry *argv = (struct ccs_argv_entry *) (ptr2 + condc); |
| 1232 |
struct ccs_envp_entry *envp = (struct ccs_envp_entry *) (argv + argc); |
| 1233 |
struct ccs_symlinkp_entry *symlinkp |
| 1234 |
= (struct ccs_symlinkp_entry *) (envp + envc); |
| 1235 |
for (i = 0; i < argc; i++) |
| 1236 |
ccs_put_name(argv[i].value); |
| 1237 |
for (i = 0; i < envc; i++) { |
| 1238 |
ccs_put_name(envp[i].name); |
| 1239 |
ccs_put_name(envp[i].value); |
| 1240 |
} |
| 1241 |
for (i = 0; i < symlinkc; i++) |
| 1242 |
ccs_put_name(symlinkp[i].value); |
| 1243 |
ccs_memory_free(ptr, sizeof(*ptr)); |
| 1244 |
} |
| 1245 |
|
| 1246 |
static int ccs_gc_thread(void *unused) |
| 1247 |
{ |
| 1248 |
static DEFINE_MUTEX(ccs_gc_mutex); |
| 1249 |
static LIST_HEAD(ccs_gc_queue); |
| 1250 |
if (!mutex_trylock(&ccs_gc_mutex)) |
| 1251 |
return 0; |
| 1252 |
mutex_lock(&ccs_policy_lock); |
| 1253 |
{ |
| 1254 |
struct ccs_globally_readable_file_entry *ptr; |
| 1255 |
list_for_each_entry_rcu(ptr, &ccs_globally_readable_list, |
| 1256 |
list) { |
| 1257 |
if (!ptr->is_deleted) |
| 1258 |
continue; |
| 1259 |
if (ccs_add_to_gc(CCS_ID_GLOBALLY_READABLE, ptr, |
| 1260 |
&ccs_gc_queue)) |
| 1261 |
list_del_rcu(&ptr->list); |
| 1262 |
else |
| 1263 |
break; |
| 1264 |
} |
| 1265 |
} |
| 1266 |
{ |
| 1267 |
struct ccs_globally_usable_env_entry *ptr; |
| 1268 |
list_for_each_entry_rcu(ptr, &ccs_globally_usable_env_list, |
| 1269 |
list) { |
| 1270 |
if (!ptr->is_deleted) |
| 1271 |
continue; |
| 1272 |
if (ccs_add_to_gc(CCS_ID_GLOBAL_ENV, ptr, |
| 1273 |
&ccs_gc_queue)) |
| 1274 |
list_del_rcu(&ptr->list); |
| 1275 |
else |
| 1276 |
break; |
| 1277 |
} |
| 1278 |
} |
| 1279 |
{ |
| 1280 |
struct ccs_pattern_entry *ptr; |
| 1281 |
list_for_each_entry_rcu(ptr, &ccs_pattern_list, list) { |
| 1282 |
if (!ptr->is_deleted) |
| 1283 |
continue; |
| 1284 |
if (ccs_add_to_gc(CCS_ID_PATTERN, ptr, |
| 1285 |
&ccs_gc_queue)) |
| 1286 |
list_del_rcu(&ptr->list); |
| 1287 |
else |
| 1288 |
break; |
| 1289 |
} |
| 1290 |
} |
| 1291 |
{ |
| 1292 |
struct ccs_no_rewrite_entry *ptr; |
| 1293 |
list_for_each_entry_rcu(ptr, &ccs_no_rewrite_list, list) { |
| 1294 |
if (!ptr->is_deleted) |
| 1295 |
continue; |
| 1296 |
if (ccs_add_to_gc(CCS_ID_NO_REWRITE, ptr, |
| 1297 |
&ccs_gc_queue)) |
| 1298 |
list_del_rcu(&ptr->list); |
| 1299 |
else |
| 1300 |
break; |
| 1301 |
} |
| 1302 |
} |
| 1303 |
{ |
| 1304 |
struct ccs_domain_initializer_entry *ptr; |
| 1305 |
list_for_each_entry_rcu(ptr, &ccs_domain_initializer_list, |
| 1306 |
list) { |
| 1307 |
if (!ptr->is_deleted) |
| 1308 |
continue; |
| 1309 |
if (ccs_add_to_gc(CCS_ID_DOMAIN_INITIALIZER, |
| 1310 |
ptr, &ccs_gc_queue)) |
| 1311 |
list_del_rcu(&ptr->list); |
| 1312 |
else |
| 1313 |
break; |
| 1314 |
} |
| 1315 |
} |
| 1316 |
{ |
| 1317 |
struct ccs_domain_keeper_entry *ptr; |
| 1318 |
list_for_each_entry_rcu(ptr, &ccs_domain_keeper_list, list) { |
| 1319 |
if (!ptr->is_deleted) |
| 1320 |
continue; |
| 1321 |
if (ccs_add_to_gc(CCS_ID_DOMAIN_KEEPER, ptr, |
| 1322 |
&ccs_gc_queue)) |
| 1323 |
list_del_rcu(&ptr->list); |
| 1324 |
else |
| 1325 |
break; |
| 1326 |
} |
| 1327 |
} |
| 1328 |
{ |
| 1329 |
struct ccs_alias_entry *ptr; |
| 1330 |
list_for_each_entry_rcu(ptr, &ccs_alias_list, list) { |
| 1331 |
if (!ptr->is_deleted) |
| 1332 |
continue; |
| 1333 |
if (ccs_add_to_gc(CCS_ID_ALIAS, ptr, &ccs_gc_queue)) |
| 1334 |
list_del_rcu(&ptr->list); |
| 1335 |
else |
| 1336 |
break; |
| 1337 |
} |
| 1338 |
} |
| 1339 |
{ |
| 1340 |
struct ccs_policy_manager_entry *ptr; |
| 1341 |
list_for_each_entry_rcu(ptr, &ccs_policy_manager_list, list) { |
| 1342 |
if (!ptr->is_deleted) |
| 1343 |
continue; |
| 1344 |
if (ccs_add_to_gc(CCS_ID_MANAGER, ptr, &ccs_gc_queue)) |
| 1345 |
list_del_rcu(&ptr->list); |
| 1346 |
else |
| 1347 |
break; |
| 1348 |
} |
| 1349 |
} |
| 1350 |
{ |
| 1351 |
struct ccs_aggregator_entry *ptr; |
| 1352 |
list_for_each_entry_rcu(ptr, &ccs_aggregator_list, list) { |
| 1353 |
if (!ptr->is_deleted) |
| 1354 |
continue; |
| 1355 |
if (ccs_add_to_gc(CCS_ID_AGGREGATOR, ptr, |
| 1356 |
&ccs_gc_queue)) |
| 1357 |
list_del_rcu(&ptr->list); |
| 1358 |
else |
| 1359 |
break; |
| 1360 |
} |
| 1361 |
} |
| 1362 |
mutex_unlock(&ccs_policy_lock); |
| 1363 |
{ |
| 1364 |
struct ccs_domain_info *domain; |
| 1365 |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
| 1366 |
struct ccs_acl_info *acl; |
| 1367 |
list_for_each_entry_rcu(acl, &domain->acl_info_list, |
| 1368 |
list) { |
| 1369 |
if (!(acl->type & ACL_DELETED)) |
| 1370 |
continue; |
| 1371 |
if (ccs_add_to_gc(CCS_ID_ACL, acl, |
| 1372 |
&ccs_gc_queue)) |
| 1373 |
list_del_rcu(&acl->list); |
| 1374 |
else |
| 1375 |
break; |
| 1376 |
} |
| 1377 |
if (!domain->is_deleted || |
| 1378 |
ccs_used_by_task(domain)) |
| 1379 |
continue; |
| 1380 |
if (ccs_add_to_gc(CCS_ID_DOMAIN, domain, &ccs_gc_queue)) |
| 1381 |
list_del_rcu(&domain->list); |
| 1382 |
else |
| 1383 |
break; |
| 1384 |
} |
| 1385 |
} |
| 1386 |
{ |
| 1387 |
struct ccs_path_group_entry *group; |
| 1388 |
list_for_each_entry_rcu(group, &ccs_path_group_list, list) { |
| 1389 |
struct ccs_path_group_member *member; |
| 1390 |
list_for_each_entry_rcu(member, |
| 1391 |
&group->path_group_member_list, |
| 1392 |
list) { |
| 1393 |
if (!member->is_deleted) |
| 1394 |
continue; |
| 1395 |
if (ccs_add_to_gc(CCS_ID_PATH_GROUP_MEMBER, |
| 1396 |
member, &ccs_gc_queue)) |
| 1397 |
list_del_rcu(&member->list); |
| 1398 |
else |
| 1399 |
break; |
| 1400 |
} |
| 1401 |
if (!list_empty(&group->path_group_member_list) || |
| 1402 |
atomic_read(&group->users)) |
| 1403 |
continue; |
| 1404 |
if (ccs_add_to_gc(CCS_ID_PATH_GROUP, group, |
| 1405 |
&ccs_gc_queue)) |
| 1406 |
list_del_rcu(&group->list); |
| 1407 |
else |
| 1408 |
break; |
| 1409 |
} |
| 1410 |
} |
| 1411 |
{ |
| 1412 |
struct ccs_address_group_entry *group; |
| 1413 |
list_for_each_entry_rcu(group, &ccs_address_group_list, list) { |
| 1414 |
struct ccs_address_group_member *member; |
| 1415 |
list_for_each_entry_rcu(member, |
| 1416 |
&group->address_group_member_list, |
| 1417 |
list) { |
| 1418 |
if (!member->is_deleted) |
| 1419 |
break; |
| 1420 |
if (ccs_add_to_gc(CCS_ID_ADDRESS_GROUP_MEMBER, |
| 1421 |
member, &ccs_gc_queue)) |
| 1422 |
list_del_rcu(&member->list); |
| 1423 |
else |
| 1424 |
break; |
| 1425 |
} |
| 1426 |
if (!list_empty(&group->address_group_member_list) || |
| 1427 |
atomic_read(&group->users)) |
| 1428 |
continue; |
| 1429 |
if (ccs_add_to_gc(CCS_ID_ADDRESS_GROUP, group, |
| 1430 |
&ccs_gc_queue)) |
| 1431 |
list_del_rcu(&group->list); |
| 1432 |
else |
| 1433 |
break; |
| 1434 |
} |
| 1435 |
} |
| 1436 |
{ |
| 1437 |
struct ccs_reserved_entry *ptr; |
| 1438 |
list_for_each_entry_rcu(ptr, &ccs_reservedport_list, list) { |
| 1439 |
if (!ptr->is_deleted) |
| 1440 |
continue; |
| 1441 |
if (ccs_add_to_gc(CCS_ID_RESERVEDPORT, ptr, |
| 1442 |
&ccs_gc_queue)) |
| 1443 |
list_del_rcu(&ptr->list); |
| 1444 |
else |
| 1445 |
break; |
| 1446 |
} |
| 1447 |
} |
| 1448 |
{ |
| 1449 |
struct ccs_condition *ptr; |
| 1450 |
list_for_each_entry_rcu(ptr, &ccs_condition_list, list) { |
| 1451 |
if (atomic_read(&ptr->users)) |
| 1452 |
continue; |
| 1453 |
if (ccs_add_to_gc(CCS_ID_CONDITION, ptr, &ccs_gc_queue)) |
| 1454 |
list_del_rcu(&ptr->list); |
| 1455 |
else |
| 1456 |
break; |
| 1457 |
} |
| 1458 |
} |
| 1459 |
mutex_unlock(&ccs_policy_lock); |
| 1460 |
if (list_empty(&ccs_gc_queue)) |
| 1461 |
goto done; |
| 1462 |
synchronize_srcu(&ccs_ss); |
| 1463 |
{ |
| 1464 |
struct ccs_gc_entry *p; |
| 1465 |
struct ccs_gc_entry *tmp; |
| 1466 |
size_t size = 0; |
| 1467 |
list_for_each_entry_safe(p, tmp, &ccs_gc_queue, list) { |
| 1468 |
switch (p->type) { |
| 1469 |
case CCS_ID_DOMAIN_INITIALIZER: |
| 1470 |
ccs_del_domain_initializer(p->element); |
| 1471 |
break; |
| 1472 |
case CCS_ID_DOMAIN_KEEPER: |
| 1473 |
ccs_del_domain_keeper(p->element); |
| 1474 |
break; |
| 1475 |
case CCS_ID_ALIAS: |
| 1476 |
ccs_del_alias(p->element); |
| 1477 |
break; |
| 1478 |
case CCS_ID_GLOBALLY_READABLE: |
| 1479 |
ccs_del_allow_read(p->element); |
| 1480 |
break; |
| 1481 |
case CCS_ID_PATTERN: |
| 1482 |
ccs_del_file_pattern(p->element); |
| 1483 |
break; |
| 1484 |
case CCS_ID_NO_REWRITE: |
| 1485 |
ccs_del_no_rewrite(p->element); |
| 1486 |
break; |
| 1487 |
case CCS_ID_MANAGER: |
| 1488 |
ccs_del_manager(p->element); |
| 1489 |
break; |
| 1490 |
case CCS_ID_GLOBAL_ENV: |
| 1491 |
ccs_del_allow_env(p->element); |
| 1492 |
break; |
| 1493 |
case CCS_ID_AGGREGATOR: |
| 1494 |
ccs_del_aggregator(p->element); |
| 1495 |
break; |
| 1496 |
case CCS_ID_PATH_GROUP_MEMBER: |
| 1497 |
ccs_del_path_group_member(p->element); |
| 1498 |
break; |
| 1499 |
case CCS_ID_PATH_GROUP: |
| 1500 |
ccs_del_path_group(p->element); |
| 1501 |
break; |
| 1502 |
case CCS_ID_ADDRESS_GROUP_MEMBER: |
| 1503 |
ccs_del_address_group_member(p->element); |
| 1504 |
break; |
| 1505 |
case CCS_ID_ADDRESS_GROUP: |
| 1506 |
ccs_del_address_group(p->element); |
| 1507 |
break; |
| 1508 |
case CCS_ID_RESERVEDPORT: |
| 1509 |
ccs_del_reservedport(p->element); |
| 1510 |
break; |
| 1511 |
case CCS_ID_CONDITION: |
| 1512 |
ccs_del_condition(p->element); |
| 1513 |
break; |
| 1514 |
case CCS_ID_ACL: |
| 1515 |
ccs_del_acl(p->element); |
| 1516 |
break; |
| 1517 |
case CCS_ID_DOMAIN: |
| 1518 |
if (!ccs_del_domain(p->element)) |
| 1519 |
continue; |
| 1520 |
break; |
| 1521 |
} |
| 1522 |
ccs_memory_free(p->element, size); |
| 1523 |
list_del(&p->list); |
| 1524 |
kfree(p); |
| 1525 |
} |
| 1526 |
} |
| 1527 |
done: |
| 1528 |
mutex_unlock(&ccs_gc_mutex); |
| 1529 |
return 0; |
| 1530 |
} |
| 1531 |
|
| 1532 |
#ifndef _LINUX_SRCU_H |
| 1533 |
|
| 1534 |
static DEFINE_SPINLOCK(ccs_counter_lock); |
| 1535 |
|
| 1536 |
int srcu_read_lock(struct srcu_struct *sp) |
| 1537 |
{ |
| 1538 |
int idx; |
| 1539 |
spin_lock(&ccs_counter_lock); |
| 1540 |
idx = sp->counter_idx; |
| 1541 |
sp->counter[idx]++; |
| 1542 |
spin_unlock(&ccs_counter_lock); |
| 1543 |
return idx; |
| 1544 |
} |
| 1545 |
|
| 1546 |
void srcu_read_unlock(struct srcu_struct *sp, const int idx) |
| 1547 |
{ |
| 1548 |
spin_lock(&ccs_counter_lock); |
| 1549 |
sp->counter[idx]--; |
| 1550 |
spin_unlock(&ccs_counter_lock); |
| 1551 |
} |
| 1552 |
|
| 1553 |
void synchronize_srcu(struct srcu_struct *sp) |
| 1554 |
{ |
| 1555 |
int idx; |
| 1556 |
int v; |
| 1557 |
spin_lock(&ccs_counter_lock); |
| 1558 |
idx = sp->counter_idx; |
| 1559 |
sp->counter_idx ^= 1; |
| 1560 |
v = sp->counter[idx]; |
| 1561 |
spin_unlock(&ccs_counter_lock); |
| 1562 |
while (v) { |
| 1563 |
msleep(1000); |
| 1564 |
spin_lock(&ccs_counter_lock); |
| 1565 |
v = sp->counter[idx]; |
| 1566 |
spin_unlock(&ccs_counter_lock); |
| 1567 |
} |
| 1568 |
} |
| 1569 |
|
| 1570 |
#endif |
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