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