1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2017-2018 HUAWEI, Inc. 4 * https://www.huawei.com/ 5 * Copyright (C) 2021-2022, Alibaba Cloud 6 */ 7 #include <linux/security.h> 8 #include <linux/xxhash.h> 9 #include "xattr.h" 10 11 struct erofs_xattr_iter { 12 struct super_block *sb; 13 struct erofs_buf buf; 14 erofs_off_t pos; 15 void *kaddr; 16 17 char *buffer; 18 int buffer_size, buffer_ofs; 19 20 /* getxattr */ 21 int index, infix_len; 22 struct qstr name; 23 24 /* listxattr */ 25 struct dentry *dentry; 26 }; 27 28 static const char *erofs_xattr_prefix(unsigned int idx, struct dentry *dentry); 29 30 static int erofs_init_inode_xattrs(struct inode *inode) 31 { 32 struct erofs_buf buf = __EROFS_BUF_INITIALIZER; 33 struct erofs_inode *vi = EROFS_I(inode); 34 struct super_block *sb = inode->i_sb; 35 const struct erofs_xattr_ibody_header *ih; 36 __le32 *xattr_id; 37 erofs_off_t pos; 38 unsigned int i; 39 int ret = 0; 40 41 if (!vi->xattr_isize) 42 return -ENODATA; 43 44 /* the most case is that xattrs of this inode are initialized. */ 45 if (test_bit(EROFS_I_EA_INITED_BIT, &vi->flags)) { 46 /* 47 * paired with smp_mb() at the end of the function to ensure 48 * fields will only be observed after the bit is set. 49 */ 50 smp_mb(); 51 return 0; 52 } 53 if (wait_on_bit_lock(&vi->flags, EROFS_I_BL_XATTR_BIT, TASK_KILLABLE)) 54 return -ERESTARTSYS; 55 56 /* someone has initialized xattrs for us? */ 57 if (test_bit(EROFS_I_EA_INITED_BIT, &vi->flags)) 58 goto out_unlock; 59 60 /* 61 * bypass all xattr operations if ->xattr_isize is not greater than 62 * sizeof(struct erofs_xattr_ibody_header), in detail: 63 * 1) it is not enough to contain erofs_xattr_ibody_header then 64 * ->xattr_isize should be 0 (it means no xattr); 65 * 2) it is just to contain erofs_xattr_ibody_header, which is on-disk 66 * undefined right now (maybe use later with some new sb feature). 67 */ 68 if (vi->xattr_isize == sizeof(struct erofs_xattr_ibody_header)) { 69 erofs_err(sb, "xattr_isize %d of nid %llu is not supported yet", 70 vi->xattr_isize, vi->nid); 71 ret = -EOPNOTSUPP; 72 goto out_unlock; 73 } else if (vi->xattr_isize < sizeof(struct erofs_xattr_ibody_header)) { 74 erofs_err(sb, "bogus xattr ibody @ nid %llu", vi->nid); 75 DBG_BUGON(1); 76 ret = -EFSCORRUPTED; 77 goto out_unlock; 78 } 79 80 pos = erofs_iloc(inode) + vi->inode_isize; 81 ih = erofs_read_metabuf(&buf, sb, pos, erofs_inode_in_metabox(inode)); 82 if (IS_ERR(ih)) { 83 ret = PTR_ERR(ih); 84 goto out_unlock; 85 } 86 vi->xattr_name_filter = le32_to_cpu(ih->h_name_filter); 87 vi->xattr_shared_count = ih->h_shared_count; 88 if ((u32)vi->xattr_shared_count * sizeof(__le32) > 89 vi->xattr_isize - sizeof(struct erofs_xattr_ibody_header)) { 90 erofs_err(sb, "invalid h_shared_count %u @ nid %llu", 91 vi->xattr_shared_count, vi->nid); 92 erofs_put_metabuf(&buf); 93 ret = -EFSCORRUPTED; 94 goto out_unlock; 95 } 96 vi->xattr_shared_xattrs = kmalloc_objs(uint, vi->xattr_shared_count); 97 if (!vi->xattr_shared_xattrs) { 98 erofs_put_metabuf(&buf); 99 ret = -ENOMEM; 100 goto out_unlock; 101 } 102 103 /* skip the ibody header and read the shared xattr array */ 104 pos += sizeof(struct erofs_xattr_ibody_header); 105 for (i = 0; i < vi->xattr_shared_count; ++i) { 106 xattr_id = erofs_bread(&buf, pos + i * sizeof(__le32), true); 107 if (IS_ERR(xattr_id)) { 108 kfree(vi->xattr_shared_xattrs); 109 vi->xattr_shared_xattrs = NULL; 110 ret = PTR_ERR(xattr_id); 111 goto out_unlock; 112 } 113 vi->xattr_shared_xattrs[i] = le32_to_cpu(*xattr_id); 114 } 115 erofs_put_metabuf(&buf); 116 117 /* paired with smp_mb() at the beginning of the function. */ 118 smp_mb(); 119 set_bit(EROFS_I_EA_INITED_BIT, &vi->flags); 120 out_unlock: 121 clear_and_wake_up_bit(EROFS_I_BL_XATTR_BIT, &vi->flags); 122 return ret; 123 } 124 125 static int erofs_xattr_copy_to_buffer(struct erofs_xattr_iter *it, 126 unsigned int len) 127 { 128 unsigned int slice, processed; 129 struct super_block *sb = it->sb; 130 131 for (processed = 0; processed < len; processed += slice) { 132 it->kaddr = erofs_bread(&it->buf, it->pos, true); 133 if (IS_ERR(it->kaddr)) 134 return PTR_ERR(it->kaddr); 135 136 slice = min_t(unsigned int, sb->s_blocksize - 137 erofs_blkoff(sb, it->pos), len - processed); 138 memcpy(it->buffer + it->buffer_ofs, it->kaddr, slice); 139 it->buffer_ofs += slice; 140 it->pos += slice; 141 } 142 return 0; 143 } 144 145 static int erofs_listxattr_foreach(struct erofs_xattr_iter *it) 146 { 147 struct erofs_xattr_entry entry; 148 unsigned int base_index, name_total, prefix_len, infix_len = 0; 149 const char *prefix, *infix = NULL; 150 int err; 151 152 /* 1. handle xattr entry */ 153 entry = *(struct erofs_xattr_entry *)it->kaddr; 154 it->pos += sizeof(struct erofs_xattr_entry); 155 156 base_index = entry.e_name_index; 157 if (entry.e_name_index & EROFS_XATTR_LONG_PREFIX) { 158 struct erofs_sb_info *sbi = EROFS_SB(it->sb); 159 struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes + 160 (entry.e_name_index & EROFS_XATTR_LONG_PREFIX_MASK); 161 162 if (pf >= sbi->xattr_prefixes + sbi->xattr_prefix_count) 163 return 0; 164 infix = pf->prefix->infix; 165 infix_len = pf->infix_len; 166 base_index = pf->prefix->base_index; 167 } 168 169 prefix = erofs_xattr_prefix(base_index, it->dentry); 170 if (!prefix) 171 return 0; 172 prefix_len = strlen(prefix); 173 name_total = prefix_len + infix_len + entry.e_name_len + 1; 174 175 if (!it->buffer) { 176 it->buffer_ofs += name_total; 177 return 0; 178 } 179 180 if (it->buffer_ofs + name_total > it->buffer_size) 181 return -ERANGE; 182 183 memcpy(it->buffer + it->buffer_ofs, prefix, prefix_len); 184 memcpy(it->buffer + it->buffer_ofs + prefix_len, infix, infix_len); 185 it->buffer_ofs += prefix_len + infix_len; 186 187 /* 2. handle xattr name */ 188 err = erofs_xattr_copy_to_buffer(it, entry.e_name_len); 189 if (err) 190 return err; 191 192 it->buffer[it->buffer_ofs++] = '\0'; 193 return 0; 194 } 195 196 static int erofs_getxattr_foreach(struct erofs_xattr_iter *it) 197 { 198 struct super_block *sb = it->sb; 199 struct erofs_xattr_entry entry; 200 unsigned int slice, processed, value_sz; 201 202 /* 1. handle xattr entry */ 203 entry = *(struct erofs_xattr_entry *)it->kaddr; 204 it->pos += sizeof(struct erofs_xattr_entry); 205 value_sz = le16_to_cpu(entry.e_value_size); 206 207 /* should also match the infix for long name prefixes */ 208 if (entry.e_name_index & EROFS_XATTR_LONG_PREFIX) { 209 struct erofs_sb_info *sbi = EROFS_SB(sb); 210 struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes + 211 (entry.e_name_index & EROFS_XATTR_LONG_PREFIX_MASK); 212 213 if (pf >= sbi->xattr_prefixes + sbi->xattr_prefix_count) 214 return -ENODATA; 215 216 if (it->index != pf->prefix->base_index || 217 it->name.len != entry.e_name_len + pf->infix_len) 218 return -ENODATA; 219 220 if (memcmp(it->name.name, pf->prefix->infix, pf->infix_len)) 221 return -ENODATA; 222 223 it->infix_len = pf->infix_len; 224 } else { 225 if (it->index != entry.e_name_index || 226 it->name.len != entry.e_name_len) 227 return -ENODATA; 228 229 it->infix_len = 0; 230 } 231 232 /* 2. handle xattr name */ 233 for (processed = 0; processed < entry.e_name_len; processed += slice) { 234 it->kaddr = erofs_bread(&it->buf, it->pos, true); 235 if (IS_ERR(it->kaddr)) 236 return PTR_ERR(it->kaddr); 237 238 slice = min_t(unsigned int, 239 sb->s_blocksize - erofs_blkoff(sb, it->pos), 240 entry.e_name_len - processed); 241 if (memcmp(it->name.name + it->infix_len + processed, 242 it->kaddr, slice)) 243 return -ENODATA; 244 it->pos += slice; 245 } 246 247 /* 3. handle xattr value */ 248 if (!it->buffer) { 249 it->buffer_ofs = value_sz; 250 return 0; 251 } 252 253 if (it->buffer_size < value_sz) 254 return -ERANGE; 255 256 return erofs_xattr_copy_to_buffer(it, value_sz); 257 } 258 259 static int erofs_xattr_iter_inline(struct erofs_xattr_iter *it, 260 struct inode *inode, bool getxattr) 261 { 262 struct erofs_inode *const vi = EROFS_I(inode); 263 unsigned int xattr_header_sz, remaining, entry_sz; 264 erofs_off_t next_pos; 265 int ret; 266 267 xattr_header_sz = sizeof(struct erofs_xattr_ibody_header) + 268 sizeof(u32) * vi->xattr_shared_count; 269 if (xattr_header_sz >= vi->xattr_isize) { 270 DBG_BUGON(xattr_header_sz > vi->xattr_isize); 271 return -ENODATA; 272 } 273 274 ret = erofs_init_metabuf(&it->buf, it->sb, erofs_inode_in_metabox(inode)); 275 if (ret) 276 return ret; 277 remaining = vi->xattr_isize - xattr_header_sz; 278 it->pos = erofs_iloc(inode) + vi->inode_isize + xattr_header_sz; 279 280 while (remaining) { 281 it->kaddr = erofs_bread(&it->buf, it->pos, true); 282 if (IS_ERR(it->kaddr)) 283 return PTR_ERR(it->kaddr); 284 285 entry_sz = erofs_xattr_entry_size(it->kaddr); 286 /* xattr on-disk corruption: xattr entry beyond xattr_isize */ 287 if (remaining < entry_sz) { 288 DBG_BUGON(1); 289 return -EFSCORRUPTED; 290 } 291 remaining -= entry_sz; 292 next_pos = it->pos + entry_sz; 293 294 if (getxattr) 295 ret = erofs_getxattr_foreach(it); 296 else 297 ret = erofs_listxattr_foreach(it); 298 if ((getxattr && ret != -ENODATA) || (!getxattr && ret)) 299 break; 300 301 it->pos = next_pos; 302 } 303 return ret; 304 } 305 306 static int erofs_xattr_iter_shared(struct erofs_xattr_iter *it, 307 struct inode *inode, bool getxattr) 308 { 309 struct erofs_inode *const vi = EROFS_I(inode); 310 struct super_block *const sb = it->sb; 311 struct erofs_sb_info *sbi = EROFS_SB(sb); 312 unsigned int i = 0; 313 int ret; 314 315 ret = erofs_init_metabuf(&it->buf, sb, 316 erofs_sb_has_shared_ea_in_metabox(sbi)); 317 if (ret) 318 return ret; 319 320 while (i < vi->xattr_shared_count) { 321 it->pos = erofs_pos(sb, sbi->xattr_blkaddr) + 322 vi->xattr_shared_xattrs[i++] * sizeof(__le32); 323 it->kaddr = erofs_bread(&it->buf, it->pos, true); 324 if (IS_ERR(it->kaddr)) 325 return PTR_ERR(it->kaddr); 326 327 if (getxattr) 328 ret = erofs_getxattr_foreach(it); 329 else 330 ret = erofs_listxattr_foreach(it); 331 if ((getxattr && ret != -ENODATA) || (!getxattr && ret)) 332 break; 333 } 334 return i ? ret : -ENODATA; 335 } 336 337 static int erofs_getxattr(struct inode *inode, int index, const char *name, 338 void *buffer, size_t buffer_size) 339 { 340 int ret; 341 unsigned int hashbit; 342 struct erofs_xattr_iter it; 343 struct erofs_inode *vi = EROFS_I(inode); 344 struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb); 345 346 if (!name) 347 return -EINVAL; 348 349 ret = erofs_init_inode_xattrs(inode); 350 if (ret) 351 return ret; 352 353 /* reserved flag is non-zero if there's any change of on-disk format */ 354 if (erofs_sb_has_xattr_filter(sbi) && !sbi->xattr_filter_reserved) { 355 hashbit = xxh32(name, strlen(name), 356 EROFS_XATTR_FILTER_SEED + index); 357 hashbit &= EROFS_XATTR_FILTER_BITS - 1; 358 if (vi->xattr_name_filter & (1U << hashbit)) 359 return -ENODATA; 360 } 361 362 it.index = index; 363 it.name = QSTR(name); 364 if (it.name.len > EROFS_NAME_LEN) 365 return -ERANGE; 366 367 it.sb = inode->i_sb; 368 it.buf = __EROFS_BUF_INITIALIZER; 369 it.buffer = buffer; 370 it.buffer_size = buffer_size; 371 it.buffer_ofs = 0; 372 373 ret = erofs_xattr_iter_inline(&it, inode, true); 374 if (ret == -ENODATA) 375 ret = erofs_xattr_iter_shared(&it, inode, true); 376 erofs_put_metabuf(&it.buf); 377 return ret ? ret : it.buffer_ofs; 378 } 379 380 ssize_t erofs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 381 { 382 int ret; 383 struct erofs_xattr_iter it; 384 struct inode *inode = d_inode(dentry); 385 386 ret = erofs_init_inode_xattrs(inode); 387 if (ret == -ENODATA) 388 return 0; 389 if (ret) 390 return ret; 391 392 it.sb = dentry->d_sb; 393 it.buf = __EROFS_BUF_INITIALIZER; 394 it.dentry = dentry; 395 it.buffer = buffer; 396 it.buffer_size = buffer_size; 397 it.buffer_ofs = 0; 398 399 ret = erofs_xattr_iter_inline(&it, inode, false); 400 if (!ret || ret == -ENODATA) 401 ret = erofs_xattr_iter_shared(&it, inode, false); 402 if (ret == -ENODATA) 403 ret = 0; 404 erofs_put_metabuf(&it.buf); 405 return ret ? ret : it.buffer_ofs; 406 } 407 408 static bool erofs_xattr_user_list(struct dentry *dentry) 409 { 410 return test_opt(&EROFS_SB(dentry->d_sb)->opt, XATTR_USER); 411 } 412 413 static bool erofs_xattr_trusted_list(struct dentry *dentry) 414 { 415 return capable(CAP_SYS_ADMIN); 416 } 417 418 static int erofs_xattr_generic_get(const struct xattr_handler *handler, 419 struct dentry *unused, struct inode *inode, 420 const char *name, void *buffer, size_t size) 421 { 422 if (handler->flags == EROFS_XATTR_INDEX_USER && 423 !test_opt(&EROFS_I_SB(inode)->opt, XATTR_USER)) 424 return -EOPNOTSUPP; 425 426 return erofs_getxattr(inode, handler->flags, name, buffer, size); 427 } 428 429 static const struct xattr_handler erofs_xattr_user_handler = { 430 .prefix = XATTR_USER_PREFIX, 431 .flags = EROFS_XATTR_INDEX_USER, 432 .list = erofs_xattr_user_list, 433 .get = erofs_xattr_generic_get, 434 }; 435 436 static const struct xattr_handler erofs_xattr_trusted_handler = { 437 .prefix = XATTR_TRUSTED_PREFIX, 438 .flags = EROFS_XATTR_INDEX_TRUSTED, 439 .list = erofs_xattr_trusted_list, 440 .get = erofs_xattr_generic_get, 441 }; 442 443 #ifdef CONFIG_EROFS_FS_SECURITY 444 static const struct xattr_handler erofs_xattr_security_handler = { 445 .prefix = XATTR_SECURITY_PREFIX, 446 .flags = EROFS_XATTR_INDEX_SECURITY, 447 .get = erofs_xattr_generic_get, 448 }; 449 #endif 450 451 const struct xattr_handler * const erofs_xattr_handlers[] = { 452 &erofs_xattr_user_handler, 453 &erofs_xattr_trusted_handler, 454 #ifdef CONFIG_EROFS_FS_SECURITY 455 &erofs_xattr_security_handler, 456 #endif 457 NULL, 458 }; 459 460 static const char *erofs_xattr_prefix(unsigned int idx, struct dentry *dentry) 461 { 462 static const struct xattr_handler * const xattr_handler_map[] = { 463 [EROFS_XATTR_INDEX_USER] = &erofs_xattr_user_handler, 464 #ifdef CONFIG_EROFS_FS_POSIX_ACL 465 [EROFS_XATTR_INDEX_POSIX_ACL_ACCESS] = &nop_posix_acl_access, 466 [EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &nop_posix_acl_default, 467 #endif 468 [EROFS_XATTR_INDEX_TRUSTED] = &erofs_xattr_trusted_handler, 469 #ifdef CONFIG_EROFS_FS_SECURITY 470 [EROFS_XATTR_INDEX_SECURITY] = &erofs_xattr_security_handler, 471 #endif 472 }; 473 const struct xattr_handler *handler = NULL; 474 475 if (idx && idx < ARRAY_SIZE(xattr_handler_map)) { 476 handler = xattr_handler_map[idx]; 477 if (xattr_handler_can_list(handler, dentry)) 478 return xattr_prefix(handler); 479 } 480 return NULL; 481 } 482 483 void erofs_xattr_prefixes_cleanup(struct super_block *sb) 484 { 485 struct erofs_sb_info *sbi = EROFS_SB(sb); 486 int i; 487 488 if (sbi->xattr_prefixes) { 489 for (i = 0; i < sbi->xattr_prefix_count; i++) 490 kfree(sbi->xattr_prefixes[i].prefix); 491 kfree(sbi->xattr_prefixes); 492 sbi->xattr_prefixes = NULL; 493 } 494 } 495 496 int erofs_xattr_prefixes_init(struct super_block *sb) 497 { 498 struct erofs_sb_info *sbi = EROFS_SB(sb); 499 struct erofs_buf buf = __EROFS_BUF_INITIALIZER; 500 erofs_off_t pos = (erofs_off_t)sbi->xattr_prefix_start << 2; 501 struct erofs_xattr_prefix_item *pfs; 502 int ret = 0, i, len; 503 bool plain = erofs_sb_has_plain_xattr_pfx(sbi); 504 505 if (!sbi->xattr_prefix_count) 506 return 0; 507 508 pfs = kzalloc_objs(*pfs, sbi->xattr_prefix_count); 509 if (!pfs) 510 return -ENOMEM; 511 512 if (!plain) { 513 if (erofs_sb_has_metabox(sbi)) 514 (void)erofs_init_metabuf(&buf, sb, true); 515 else if (sbi->packed_inode) 516 buf.mapping = sbi->packed_inode->i_mapping; 517 else 518 plain = true; 519 } 520 if (plain) 521 (void)erofs_init_metabuf(&buf, sb, false); 522 523 for (i = 0; i < sbi->xattr_prefix_count; i++) { 524 void *ptr = erofs_read_metadata(sb, &buf, &pos, &len); 525 526 if (IS_ERR(ptr)) { 527 ret = PTR_ERR(ptr); 528 break; 529 } else if (len < sizeof(*pfs->prefix) || 530 len > EROFS_NAME_LEN + sizeof(*pfs->prefix)) { 531 kfree(ptr); 532 ret = -EFSCORRUPTED; 533 break; 534 } 535 pfs[i].prefix = ptr; 536 pfs[i].infix_len = len - sizeof(struct erofs_xattr_long_prefix); 537 } 538 539 erofs_put_metabuf(&buf); 540 if (!ret && erofs_sb_has_ishare_xattrs(sbi)) { 541 struct erofs_xattr_prefix_item *pf = pfs + sbi->ishare_xattr_prefix_id; 542 struct erofs_xattr_long_prefix *newpfx; 543 544 newpfx = krealloc(pf->prefix, 545 sizeof(*newpfx) + pf->infix_len + 1, GFP_KERNEL); 546 if (newpfx) { 547 newpfx->infix[pf->infix_len] = '\0'; 548 pf->prefix = newpfx; 549 } else { 550 ret = -ENOMEM; 551 } 552 } 553 sbi->xattr_prefixes = pfs; 554 if (ret) 555 erofs_xattr_prefixes_cleanup(sb); 556 return ret; 557 } 558 559 #ifdef CONFIG_EROFS_FS_POSIX_ACL 560 struct posix_acl *erofs_get_acl(struct inode *inode, int type, bool rcu) 561 { 562 struct posix_acl *acl; 563 int prefix, rc; 564 char *value = NULL; 565 566 if (rcu) 567 return ERR_PTR(-ECHILD); 568 569 switch (type) { 570 case ACL_TYPE_ACCESS: 571 prefix = EROFS_XATTR_INDEX_POSIX_ACL_ACCESS; 572 break; 573 case ACL_TYPE_DEFAULT: 574 prefix = EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT; 575 break; 576 default: 577 return ERR_PTR(-EINVAL); 578 } 579 580 rc = erofs_getxattr(inode, prefix, "", NULL, 0); 581 if (rc > 0) { 582 value = kmalloc(rc, GFP_KERNEL); 583 if (!value) 584 return ERR_PTR(-ENOMEM); 585 rc = erofs_getxattr(inode, prefix, "", value, rc); 586 } 587 588 if (rc == -ENODATA) 589 acl = NULL; 590 else if (rc < 0) 591 acl = ERR_PTR(rc); 592 else 593 acl = posix_acl_from_xattr(&init_user_ns, value, rc); 594 kfree(value); 595 return acl; 596 } 597 598 bool erofs_inode_has_noacl(struct inode *inode, void *kaddr, unsigned int ofs) 599 { 600 static const unsigned int bitmask = 601 BIT(21) | /* system.posix_acl_default */ 602 BIT(30); /* system.posix_acl_access */ 603 struct erofs_sb_info *sbi = EROFS_I_SB(inode); 604 const struct erofs_xattr_ibody_header *ih = kaddr + ofs; 605 606 if (EROFS_I(inode)->xattr_isize < sizeof(*ih)) 607 return true; 608 609 if (erofs_sb_has_xattr_filter(sbi) && !sbi->xattr_filter_reserved && 610 !check_add_overflow(ofs, sizeof(*ih), &ofs) && 611 ofs <= i_blocksize(inode)) { 612 if ((le32_to_cpu(ih->h_name_filter) & bitmask) == bitmask) 613 return true; 614 } 615 return false; 616 } 617 #endif 618 619 #ifdef CONFIG_EROFS_FS_PAGE_CACHE_SHARE 620 int erofs_xattr_fill_inode_fingerprint(struct erofs_inode_fingerprint *fp, 621 struct inode *inode, const char *domain_id) 622 { 623 struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb); 624 struct erofs_xattr_prefix_item *prefix; 625 const char *infix; 626 int valuelen, base_index; 627 628 if (!test_opt(&sbi->opt, INODE_SHARE)) 629 return -EOPNOTSUPP; 630 if (!sbi->xattr_prefixes) 631 return -EINVAL; 632 prefix = sbi->xattr_prefixes + sbi->ishare_xattr_prefix_id; 633 infix = prefix->prefix->infix; 634 base_index = prefix->prefix->base_index; 635 valuelen = erofs_getxattr(inode, base_index, infix, NULL, 0); 636 if (valuelen <= 0 || valuelen > (1 << sbi->blkszbits)) 637 return -EFSCORRUPTED; 638 fp->size = valuelen + (domain_id ? strlen(domain_id) : 0); 639 fp->opaque = kmalloc(fp->size, GFP_KERNEL); 640 if (!fp->opaque) 641 return -ENOMEM; 642 if (valuelen != erofs_getxattr(inode, base_index, infix, 643 fp->opaque, valuelen)) { 644 kfree(fp->opaque); 645 fp->opaque = NULL; 646 return -EFSCORRUPTED; 647 } 648 memcpy(fp->opaque + valuelen, domain_id, fp->size - valuelen); 649 return 0; 650 } 651 #endif 652