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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/hfsplus/xattr.c
4 *
5 * Vyacheslav Dubeyko <slava@dubeyko.com>
6 *
7 * Logic of processing extended attributes
8 */
9
10#include "hfsplus_fs.h"
11#include <linux/nls.h>
12#include "xattr.h"
13
14static int hfsplus_removexattr(struct inode *inode, const char *name);
15
16const struct xattr_handler *hfsplus_xattr_handlers[] = {
17 &hfsplus_xattr_osx_handler,
18 &hfsplus_xattr_user_handler,
19 &hfsplus_xattr_trusted_handler,
20 &hfsplus_xattr_security_handler,
21 NULL
22};
23
24static int strcmp_xattr_finder_info(const char *name)
25{
26 if (name) {
27 return strncmp(name, HFSPLUS_XATTR_FINDER_INFO_NAME,
28 sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME));
29 }
30 return -1;
31}
32
33static int strcmp_xattr_acl(const char *name)
34{
35 if (name) {
36 return strncmp(name, HFSPLUS_XATTR_ACL_NAME,
37 sizeof(HFSPLUS_XATTR_ACL_NAME));
38 }
39 return -1;
40}
41
42static bool is_known_namespace(const char *name)
43{
44 if (strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) &&
45 strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) &&
46 strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) &&
47 strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN))
48 return false;
49
50 return true;
51}
52
53static void hfsplus_init_header_node(struct inode *attr_file,
54 u32 clump_size,
55 char *buf, u16 node_size)
56{
57 struct hfs_bnode_desc *desc;
58 struct hfs_btree_header_rec *head;
59 u16 offset;
60 __be16 *rec_offsets;
61 u32 hdr_node_map_rec_bits;
62 char *bmp;
63 u32 used_nodes;
64 u32 used_bmp_bytes;
65 u64 tmp;
66
67 hfs_dbg(ATTR_MOD, "init_hdr_attr_file: clump %u, node_size %u\n",
68 clump_size, node_size);
69
70 /* The end of the node contains list of record offsets */
71 rec_offsets = (__be16 *)(buf + node_size);
72
73 desc = (struct hfs_bnode_desc *)buf;
74 desc->type = HFS_NODE_HEADER;
75 desc->num_recs = cpu_to_be16(HFSPLUS_BTREE_HDR_NODE_RECS_COUNT);
76 offset = sizeof(struct hfs_bnode_desc);
77 *--rec_offsets = cpu_to_be16(offset);
78
79 head = (struct hfs_btree_header_rec *)(buf + offset);
80 head->node_size = cpu_to_be16(node_size);
81 tmp = i_size_read(attr_file);
82 do_div(tmp, node_size);
83 head->node_count = cpu_to_be32(tmp);
84 head->free_nodes = cpu_to_be32(be32_to_cpu(head->node_count) - 1);
85 head->clump_size = cpu_to_be32(clump_size);
86 head->attributes |= cpu_to_be32(HFS_TREE_BIGKEYS | HFS_TREE_VARIDXKEYS);
87 head->max_key_len = cpu_to_be16(HFSPLUS_ATTR_KEYLEN - sizeof(u16));
88 offset += sizeof(struct hfs_btree_header_rec);
89 *--rec_offsets = cpu_to_be16(offset);
90 offset += HFSPLUS_BTREE_HDR_USER_BYTES;
91 *--rec_offsets = cpu_to_be16(offset);
92
93 hdr_node_map_rec_bits = 8 * (node_size - offset - (4 * sizeof(u16)));
94 if (be32_to_cpu(head->node_count) > hdr_node_map_rec_bits) {
95 u32 map_node_bits;
96 u32 map_nodes;
97
98 desc->next = cpu_to_be32(be32_to_cpu(head->leaf_tail) + 1);
99 map_node_bits = 8 * (node_size - sizeof(struct hfs_bnode_desc) -
100 (2 * sizeof(u16)) - 2);
101 map_nodes = (be32_to_cpu(head->node_count) -
102 hdr_node_map_rec_bits +
103 (map_node_bits - 1)) / map_node_bits;
104 be32_add_cpu(&head->free_nodes, 0 - map_nodes);
105 }
106
107 bmp = buf + offset;
108 used_nodes =
109 be32_to_cpu(head->node_count) - be32_to_cpu(head->free_nodes);
110 used_bmp_bytes = used_nodes / 8;
111 if (used_bmp_bytes) {
112 memset(bmp, 0xFF, used_bmp_bytes);
113 bmp += used_bmp_bytes;
114 used_nodes %= 8;
115 }
116 *bmp = ~(0xFF >> used_nodes);
117 offset += hdr_node_map_rec_bits / 8;
118 *--rec_offsets = cpu_to_be16(offset);
119}
120
121static int hfsplus_create_attributes_file(struct super_block *sb)
122{
123 int err = 0;
124 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
125 struct inode *attr_file;
126 struct hfsplus_inode_info *hip;
127 u32 clump_size;
128 u16 node_size = HFSPLUS_ATTR_TREE_NODE_SIZE;
129 char *buf;
130 int index, written;
131 struct address_space *mapping;
132 struct page *page;
133 int old_state = HFSPLUS_EMPTY_ATTR_TREE;
134
135 hfs_dbg(ATTR_MOD, "create_attr_file: ino %d\n", HFSPLUS_ATTR_CNID);
136
137check_attr_tree_state_again:
138 switch (atomic_read(&sbi->attr_tree_state)) {
139 case HFSPLUS_EMPTY_ATTR_TREE:
140 if (old_state != atomic_cmpxchg(&sbi->attr_tree_state,
141 old_state,
142 HFSPLUS_CREATING_ATTR_TREE))
143 goto check_attr_tree_state_again;
144 break;
145 case HFSPLUS_CREATING_ATTR_TREE:
146 /*
147 * This state means that another thread is in process
148 * of AttributesFile creation. Theoretically, it is
149 * possible to be here. But really __setxattr() method
150 * first of all calls hfs_find_init() for lookup in
151 * B-tree of CatalogFile. This method locks mutex of
152 * CatalogFile's B-tree. As a result, if some thread
153 * is inside AttributedFile creation operation then
154 * another threads will be waiting unlocking of
155 * CatalogFile's B-tree's mutex. However, if code will
156 * change then we will return error code (-EAGAIN) from
157 * here. Really, it means that first try to set of xattr
158 * fails with error but second attempt will have success.
159 */
160 return -EAGAIN;
161 case HFSPLUS_VALID_ATTR_TREE:
162 return 0;
163 case HFSPLUS_FAILED_ATTR_TREE:
164 return -EOPNOTSUPP;
165 default:
166 BUG();
167 }
168
169 attr_file = hfsplus_iget(sb, HFSPLUS_ATTR_CNID);
170 if (IS_ERR(attr_file)) {
171 pr_err("failed to load attributes file\n");
172 return PTR_ERR(attr_file);
173 }
174
175 BUG_ON(i_size_read(attr_file) != 0);
176
177 hip = HFSPLUS_I(attr_file);
178
179 clump_size = hfsplus_calc_btree_clump_size(sb->s_blocksize,
180 node_size,
181 sbi->sect_count,
182 HFSPLUS_ATTR_CNID);
183
184 mutex_lock(&hip->extents_lock);
185 hip->clump_blocks = clump_size >> sbi->alloc_blksz_shift;
186 mutex_unlock(&hip->extents_lock);
187
188 if (sbi->free_blocks <= (hip->clump_blocks << 1)) {
189 err = -ENOSPC;
190 goto end_attr_file_creation;
191 }
192
193 while (hip->alloc_blocks < hip->clump_blocks) {
194 err = hfsplus_file_extend(attr_file, false);
195 if (unlikely(err)) {
196 pr_err("failed to extend attributes file\n");
197 goto end_attr_file_creation;
198 }
199 hip->phys_size = attr_file->i_size =
200 (loff_t)hip->alloc_blocks << sbi->alloc_blksz_shift;
201 hip->fs_blocks = hip->alloc_blocks << sbi->fs_shift;
202 inode_set_bytes(attr_file, attr_file->i_size);
203 }
204
205 buf = kzalloc(node_size, GFP_NOFS);
206 if (!buf) {
207 pr_err("failed to allocate memory for header node\n");
208 err = -ENOMEM;
209 goto end_attr_file_creation;
210 }
211
212 hfsplus_init_header_node(attr_file, clump_size, buf, node_size);
213
214 mapping = attr_file->i_mapping;
215
216 index = 0;
217 written = 0;
218 for (; written < node_size; index++, written += PAGE_SIZE) {
219 void *kaddr;
220
221 page = read_mapping_page(mapping, index, NULL);
222 if (IS_ERR(page)) {
223 err = PTR_ERR(page);
224 goto failed_header_node_init;
225 }
226
227 kaddr = kmap_atomic(page);
228 memcpy(kaddr, buf + written,
229 min_t(size_t, PAGE_SIZE, node_size - written));
230 kunmap_atomic(kaddr);
231
232 set_page_dirty(page);
233 put_page(page);
234 }
235
236 hfsplus_mark_inode_dirty(attr_file, HFSPLUS_I_ATTR_DIRTY);
237
238 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
239 if (!sbi->attr_tree)
240 pr_err("failed to load attributes file\n");
241
242failed_header_node_init:
243 kfree(buf);
244
245end_attr_file_creation:
246 iput(attr_file);
247
248 if (!err)
249 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE);
250 else if (err == -ENOSPC)
251 atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE);
252 else
253 atomic_set(&sbi->attr_tree_state, HFSPLUS_FAILED_ATTR_TREE);
254
255 return err;
256}
257
258int __hfsplus_setxattr(struct inode *inode, const char *name,
259 const void *value, size_t size, int flags)
260{
261 int err = 0;
262 struct hfs_find_data cat_fd;
263 hfsplus_cat_entry entry;
264 u16 cat_entry_flags, cat_entry_type;
265 u16 folder_finderinfo_len = sizeof(struct DInfo) +
266 sizeof(struct DXInfo);
267 u16 file_finderinfo_len = sizeof(struct FInfo) +
268 sizeof(struct FXInfo);
269
270 if ((!S_ISREG(inode->i_mode) &&
271 !S_ISDIR(inode->i_mode)) ||
272 HFSPLUS_IS_RSRC(inode))
273 return -EOPNOTSUPP;
274
275 if (value == NULL)
276 return hfsplus_removexattr(inode, name);
277
278 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd);
279 if (err) {
280 pr_err("can't init xattr find struct\n");
281 return err;
282 }
283
284 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
285 if (err) {
286 pr_err("catalog searching failed\n");
287 goto end_setxattr;
288 }
289
290 if (!strcmp_xattr_finder_info(name)) {
291 if (flags & XATTR_CREATE) {
292 pr_err("xattr exists yet\n");
293 err = -EOPNOTSUPP;
294 goto end_setxattr;
295 }
296 hfs_bnode_read(cat_fd.bnode, &entry, cat_fd.entryoffset,
297 sizeof(hfsplus_cat_entry));
298 if (be16_to_cpu(entry.type) == HFSPLUS_FOLDER) {
299 if (size == folder_finderinfo_len) {
300 memcpy(&entry.folder.user_info, value,
301 folder_finderinfo_len);
302 hfs_bnode_write(cat_fd.bnode, &entry,
303 cat_fd.entryoffset,
304 sizeof(struct hfsplus_cat_folder));
305 hfsplus_mark_inode_dirty(inode,
306 HFSPLUS_I_CAT_DIRTY);
307 } else {
308 err = -ERANGE;
309 goto end_setxattr;
310 }
311 } else if (be16_to_cpu(entry.type) == HFSPLUS_FILE) {
312 if (size == file_finderinfo_len) {
313 memcpy(&entry.file.user_info, value,
314 file_finderinfo_len);
315 hfs_bnode_write(cat_fd.bnode, &entry,
316 cat_fd.entryoffset,
317 sizeof(struct hfsplus_cat_file));
318 hfsplus_mark_inode_dirty(inode,
319 HFSPLUS_I_CAT_DIRTY);
320 } else {
321 err = -ERANGE;
322 goto end_setxattr;
323 }
324 } else {
325 err = -EOPNOTSUPP;
326 goto end_setxattr;
327 }
328 goto end_setxattr;
329 }
330
331 if (!HFSPLUS_SB(inode->i_sb)->attr_tree) {
332 err = hfsplus_create_attributes_file(inode->i_sb);
333 if (unlikely(err))
334 goto end_setxattr;
335 }
336
337 if (hfsplus_attr_exists(inode, name)) {
338 if (flags & XATTR_CREATE) {
339 pr_err("xattr exists yet\n");
340 err = -EOPNOTSUPP;
341 goto end_setxattr;
342 }
343 err = hfsplus_delete_attr(inode, name);
344 if (err)
345 goto end_setxattr;
346 err = hfsplus_create_attr(inode, name, value, size);
347 if (err)
348 goto end_setxattr;
349 } else {
350 if (flags & XATTR_REPLACE) {
351 pr_err("cannot replace xattr\n");
352 err = -EOPNOTSUPP;
353 goto end_setxattr;
354 }
355 err = hfsplus_create_attr(inode, name, value, size);
356 if (err)
357 goto end_setxattr;
358 }
359
360 cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset);
361 if (cat_entry_type == HFSPLUS_FOLDER) {
362 cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode,
363 cat_fd.entryoffset +
364 offsetof(struct hfsplus_cat_folder, flags));
365 cat_entry_flags |= HFSPLUS_XATTR_EXISTS;
366 if (!strcmp_xattr_acl(name))
367 cat_entry_flags |= HFSPLUS_ACL_EXISTS;
368 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
369 offsetof(struct hfsplus_cat_folder, flags),
370 cat_entry_flags);
371 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
372 } else if (cat_entry_type == HFSPLUS_FILE) {
373 cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode,
374 cat_fd.entryoffset +
375 offsetof(struct hfsplus_cat_file, flags));
376 cat_entry_flags |= HFSPLUS_XATTR_EXISTS;
377 if (!strcmp_xattr_acl(name))
378 cat_entry_flags |= HFSPLUS_ACL_EXISTS;
379 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
380 offsetof(struct hfsplus_cat_file, flags),
381 cat_entry_flags);
382 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
383 } else {
384 pr_err("invalid catalog entry type\n");
385 err = -EIO;
386 goto end_setxattr;
387 }
388
389end_setxattr:
390 hfs_find_exit(&cat_fd);
391 return err;
392}
393
394static int name_len(const char *xattr_name, int xattr_name_len)
395{
396 int len = xattr_name_len + 1;
397
398 if (!is_known_namespace(xattr_name))
399 len += XATTR_MAC_OSX_PREFIX_LEN;
400
401 return len;
402}
403
404static int copy_name(char *buffer, const char *xattr_name, int name_len)
405{
406 int len = name_len;
407 int offset = 0;
408
409 if (!is_known_namespace(xattr_name)) {
410 memcpy(buffer, XATTR_MAC_OSX_PREFIX, XATTR_MAC_OSX_PREFIX_LEN);
411 offset += XATTR_MAC_OSX_PREFIX_LEN;
412 len += XATTR_MAC_OSX_PREFIX_LEN;
413 }
414
415 strncpy(buffer + offset, xattr_name, name_len);
416 memset(buffer + offset + name_len, 0, 1);
417 len += 1;
418
419 return len;
420}
421
422int hfsplus_setxattr(struct inode *inode, const char *name,
423 const void *value, size_t size, int flags,
424 const char *prefix, size_t prefixlen)
425{
426 char *xattr_name;
427 int res;
428
429 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
430 GFP_KERNEL);
431 if (!xattr_name)
432 return -ENOMEM;
433 strcpy(xattr_name, prefix);
434 strcpy(xattr_name + prefixlen, name);
435 res = __hfsplus_setxattr(inode, xattr_name, value, size, flags);
436 kfree(xattr_name);
437 return res;
438}
439
440static ssize_t hfsplus_getxattr_finder_info(struct inode *inode,
441 void *value, size_t size)
442{
443 ssize_t res = 0;
444 struct hfs_find_data fd;
445 u16 entry_type;
446 u16 folder_rec_len = sizeof(struct DInfo) + sizeof(struct DXInfo);
447 u16 file_rec_len = sizeof(struct FInfo) + sizeof(struct FXInfo);
448 u16 record_len = max(folder_rec_len, file_rec_len);
449 u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)];
450 u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)];
451
452 if (size >= record_len) {
453 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
454 if (res) {
455 pr_err("can't init xattr find struct\n");
456 return res;
457 }
458 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
459 if (res)
460 goto end_getxattr_finder_info;
461 entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
462
463 if (entry_type == HFSPLUS_FOLDER) {
464 hfs_bnode_read(fd.bnode, folder_finder_info,
465 fd.entryoffset +
466 offsetof(struct hfsplus_cat_folder, user_info),
467 folder_rec_len);
468 memcpy(value, folder_finder_info, folder_rec_len);
469 res = folder_rec_len;
470 } else if (entry_type == HFSPLUS_FILE) {
471 hfs_bnode_read(fd.bnode, file_finder_info,
472 fd.entryoffset +
473 offsetof(struct hfsplus_cat_file, user_info),
474 file_rec_len);
475 memcpy(value, file_finder_info, file_rec_len);
476 res = file_rec_len;
477 } else {
478 res = -EOPNOTSUPP;
479 goto end_getxattr_finder_info;
480 }
481 } else
482 res = size ? -ERANGE : record_len;
483
484end_getxattr_finder_info:
485 if (size >= record_len)
486 hfs_find_exit(&fd);
487 return res;
488}
489
490ssize_t __hfsplus_getxattr(struct inode *inode, const char *name,
491 void *value, size_t size)
492{
493 struct hfs_find_data fd;
494 hfsplus_attr_entry *entry;
495 __be32 xattr_record_type;
496 u32 record_type;
497 u16 record_length = 0;
498 ssize_t res = 0;
499
500 if ((!S_ISREG(inode->i_mode) &&
501 !S_ISDIR(inode->i_mode)) ||
502 HFSPLUS_IS_RSRC(inode))
503 return -EOPNOTSUPP;
504
505 if (!strcmp_xattr_finder_info(name))
506 return hfsplus_getxattr_finder_info(inode, value, size);
507
508 if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
509 return -EOPNOTSUPP;
510
511 entry = hfsplus_alloc_attr_entry();
512 if (!entry) {
513 pr_err("can't allocate xattr entry\n");
514 return -ENOMEM;
515 }
516
517 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd);
518 if (res) {
519 pr_err("can't init xattr find struct\n");
520 goto failed_getxattr_init;
521 }
522
523 res = hfsplus_find_attr(inode->i_sb, inode->i_ino, name, &fd);
524 if (res) {
525 if (res == -ENOENT)
526 res = -ENODATA;
527 else
528 pr_err("xattr searching failed\n");
529 goto out;
530 }
531
532 hfs_bnode_read(fd.bnode, &xattr_record_type,
533 fd.entryoffset, sizeof(xattr_record_type));
534 record_type = be32_to_cpu(xattr_record_type);
535 if (record_type == HFSPLUS_ATTR_INLINE_DATA) {
536 record_length = hfs_bnode_read_u16(fd.bnode,
537 fd.entryoffset +
538 offsetof(struct hfsplus_attr_inline_data,
539 length));
540 if (record_length > HFSPLUS_MAX_INLINE_DATA_SIZE) {
541 pr_err("invalid xattr record size\n");
542 res = -EIO;
543 goto out;
544 }
545 } else if (record_type == HFSPLUS_ATTR_FORK_DATA ||
546 record_type == HFSPLUS_ATTR_EXTENTS) {
547 pr_err("only inline data xattr are supported\n");
548 res = -EOPNOTSUPP;
549 goto out;
550 } else {
551 pr_err("invalid xattr record\n");
552 res = -EIO;
553 goto out;
554 }
555
556 if (size) {
557 hfs_bnode_read(fd.bnode, entry, fd.entryoffset,
558 offsetof(struct hfsplus_attr_inline_data,
559 raw_bytes) + record_length);
560 }
561
562 if (size >= record_length) {
563 memcpy(value, entry->inline_data.raw_bytes, record_length);
564 res = record_length;
565 } else
566 res = size ? -ERANGE : record_length;
567
568out:
569 hfs_find_exit(&fd);
570
571failed_getxattr_init:
572 hfsplus_destroy_attr_entry(entry);
573 return res;
574}
575
576ssize_t hfsplus_getxattr(struct inode *inode, const char *name,
577 void *value, size_t size,
578 const char *prefix, size_t prefixlen)
579{
580 int res;
581 char *xattr_name;
582
583 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
584 GFP_KERNEL);
585 if (!xattr_name)
586 return -ENOMEM;
587
588 strcpy(xattr_name, prefix);
589 strcpy(xattr_name + prefixlen, name);
590
591 res = __hfsplus_getxattr(inode, xattr_name, value, size);
592 kfree(xattr_name);
593 return res;
594
595}
596
597static inline int can_list(const char *xattr_name)
598{
599 if (!xattr_name)
600 return 0;
601
602 return strncmp(xattr_name, XATTR_TRUSTED_PREFIX,
603 XATTR_TRUSTED_PREFIX_LEN) ||
604 capable(CAP_SYS_ADMIN);
605}
606
607static ssize_t hfsplus_listxattr_finder_info(struct dentry *dentry,
608 char *buffer, size_t size)
609{
610 ssize_t res = 0;
611 struct inode *inode = d_inode(dentry);
612 struct hfs_find_data fd;
613 u16 entry_type;
614 u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)];
615 u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)];
616 unsigned long len, found_bit;
617 int xattr_name_len, symbols_count;
618
619 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
620 if (res) {
621 pr_err("can't init xattr find struct\n");
622 return res;
623 }
624
625 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
626 if (res)
627 goto end_listxattr_finder_info;
628
629 entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
630 if (entry_type == HFSPLUS_FOLDER) {
631 len = sizeof(struct DInfo) + sizeof(struct DXInfo);
632 hfs_bnode_read(fd.bnode, folder_finder_info,
633 fd.entryoffset +
634 offsetof(struct hfsplus_cat_folder, user_info),
635 len);
636 found_bit = find_first_bit((void *)folder_finder_info, len*8);
637 } else if (entry_type == HFSPLUS_FILE) {
638 len = sizeof(struct FInfo) + sizeof(struct FXInfo);
639 hfs_bnode_read(fd.bnode, file_finder_info,
640 fd.entryoffset +
641 offsetof(struct hfsplus_cat_file, user_info),
642 len);
643 found_bit = find_first_bit((void *)file_finder_info, len*8);
644 } else {
645 res = -EOPNOTSUPP;
646 goto end_listxattr_finder_info;
647 }
648
649 if (found_bit >= (len*8))
650 res = 0;
651 else {
652 symbols_count = sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME) - 1;
653 xattr_name_len =
654 name_len(HFSPLUS_XATTR_FINDER_INFO_NAME, symbols_count);
655 if (!buffer || !size) {
656 if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME))
657 res = xattr_name_len;
658 } else if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME)) {
659 if (size < xattr_name_len)
660 res = -ERANGE;
661 else {
662 res = copy_name(buffer,
663 HFSPLUS_XATTR_FINDER_INFO_NAME,
664 symbols_count);
665 }
666 }
667 }
668
669end_listxattr_finder_info:
670 hfs_find_exit(&fd);
671
672 return res;
673}
674
675ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
676{
677 ssize_t err;
678 ssize_t res = 0;
679 struct inode *inode = d_inode(dentry);
680 struct hfs_find_data fd;
681 u16 key_len = 0;
682 struct hfsplus_attr_key attr_key;
683 char *strbuf;
684 int xattr_name_len;
685
686 if ((!S_ISREG(inode->i_mode) &&
687 !S_ISDIR(inode->i_mode)) ||
688 HFSPLUS_IS_RSRC(inode))
689 return -EOPNOTSUPP;
690
691 res = hfsplus_listxattr_finder_info(dentry, buffer, size);
692 if (res < 0)
693 return res;
694 else if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
695 return (res == 0) ? -EOPNOTSUPP : res;
696
697 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd);
698 if (err) {
699 pr_err("can't init xattr find struct\n");
700 return err;
701 }
702
703 strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN +
704 XATTR_MAC_OSX_PREFIX_LEN + 1, GFP_KERNEL);
705 if (!strbuf) {
706 res = -ENOMEM;
707 goto out;
708 }
709
710 err = hfsplus_find_attr(inode->i_sb, inode->i_ino, NULL, &fd);
711 if (err) {
712 if (err == -ENOENT) {
713 if (res == 0)
714 res = -ENODATA;
715 goto end_listxattr;
716 } else {
717 res = err;
718 goto end_listxattr;
719 }
720 }
721
722 for (;;) {
723 key_len = hfs_bnode_read_u16(fd.bnode, fd.keyoffset);
724 if (key_len == 0 || key_len > fd.tree->max_key_len) {
725 pr_err("invalid xattr key length: %d\n", key_len);
726 res = -EIO;
727 goto end_listxattr;
728 }
729
730 hfs_bnode_read(fd.bnode, &attr_key,
731 fd.keyoffset, key_len + sizeof(key_len));
732
733 if (be32_to_cpu(attr_key.cnid) != inode->i_ino)
734 goto end_listxattr;
735
736 xattr_name_len = NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN;
737 if (hfsplus_uni2asc(inode->i_sb,
738 (const struct hfsplus_unistr *)&fd.key->attr.key_name,
739 strbuf, &xattr_name_len)) {
740 pr_err("unicode conversion failed\n");
741 res = -EIO;
742 goto end_listxattr;
743 }
744
745 if (!buffer || !size) {
746 if (can_list(strbuf))
747 res += name_len(strbuf, xattr_name_len);
748 } else if (can_list(strbuf)) {
749 if (size < (res + name_len(strbuf, xattr_name_len))) {
750 res = -ERANGE;
751 goto end_listxattr;
752 } else
753 res += copy_name(buffer + res,
754 strbuf, xattr_name_len);
755 }
756
757 if (hfs_brec_goto(&fd, 1))
758 goto end_listxattr;
759 }
760
761end_listxattr:
762 kfree(strbuf);
763out:
764 hfs_find_exit(&fd);
765 return res;
766}
767
768static int hfsplus_removexattr(struct inode *inode, const char *name)
769{
770 int err = 0;
771 struct hfs_find_data cat_fd;
772 u16 flags;
773 u16 cat_entry_type;
774 int is_xattr_acl_deleted = 0;
775 int is_all_xattrs_deleted = 0;
776
777 if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
778 return -EOPNOTSUPP;
779
780 if (!strcmp_xattr_finder_info(name))
781 return -EOPNOTSUPP;
782
783 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd);
784 if (err) {
785 pr_err("can't init xattr find struct\n");
786 return err;
787 }
788
789 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
790 if (err) {
791 pr_err("catalog searching failed\n");
792 goto end_removexattr;
793 }
794
795 err = hfsplus_delete_attr(inode, name);
796 if (err)
797 goto end_removexattr;
798
799 is_xattr_acl_deleted = !strcmp_xattr_acl(name);
800 is_all_xattrs_deleted = !hfsplus_attr_exists(inode, NULL);
801
802 if (!is_xattr_acl_deleted && !is_all_xattrs_deleted)
803 goto end_removexattr;
804
805 cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset);
806
807 if (cat_entry_type == HFSPLUS_FOLDER) {
808 flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset +
809 offsetof(struct hfsplus_cat_folder, flags));
810 if (is_xattr_acl_deleted)
811 flags &= ~HFSPLUS_ACL_EXISTS;
812 if (is_all_xattrs_deleted)
813 flags &= ~HFSPLUS_XATTR_EXISTS;
814 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
815 offsetof(struct hfsplus_cat_folder, flags),
816 flags);
817 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
818 } else if (cat_entry_type == HFSPLUS_FILE) {
819 flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset +
820 offsetof(struct hfsplus_cat_file, flags));
821 if (is_xattr_acl_deleted)
822 flags &= ~HFSPLUS_ACL_EXISTS;
823 if (is_all_xattrs_deleted)
824 flags &= ~HFSPLUS_XATTR_EXISTS;
825 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
826 offsetof(struct hfsplus_cat_file, flags),
827 flags);
828 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
829 } else {
830 pr_err("invalid catalog entry type\n");
831 err = -EIO;
832 goto end_removexattr;
833 }
834
835end_removexattr:
836 hfs_find_exit(&cat_fd);
837 return err;
838}
839
840static int hfsplus_osx_getxattr(const struct xattr_handler *handler,
841 struct dentry *unused, struct inode *inode,
842 const char *name, void *buffer, size_t size)
843{
844 /*
845 * Don't allow retrieving properly prefixed attributes
846 * by prepending them with "osx."
847 */
848 if (is_known_namespace(name))
849 return -EOPNOTSUPP;
850
851 /*
852 * osx is the namespace we use to indicate an unprefixed
853 * attribute on the filesystem (like the ones that OS X
854 * creates), so we pass the name through unmodified (after
855 * ensuring it doesn't conflict with another namespace).
856 */
857 return __hfsplus_getxattr(inode, name, buffer, size);
858}
859
860static int hfsplus_osx_setxattr(const struct xattr_handler *handler,
861 struct dentry *unused, struct inode *inode,
862 const char *name, const void *buffer,
863 size_t size, int flags)
864{
865 /*
866 * Don't allow setting properly prefixed attributes
867 * by prepending them with "osx."
868 */
869 if (is_known_namespace(name))
870 return -EOPNOTSUPP;
871
872 /*
873 * osx is the namespace we use to indicate an unprefixed
874 * attribute on the filesystem (like the ones that OS X
875 * creates), so we pass the name through unmodified (after
876 * ensuring it doesn't conflict with another namespace).
877 */
878 return __hfsplus_setxattr(inode, name, buffer, size, flags);
879}
880
881const struct xattr_handler hfsplus_xattr_osx_handler = {
882 .prefix = XATTR_MAC_OSX_PREFIX,
883 .get = hfsplus_osx_getxattr,
884 .set = hfsplus_osx_setxattr,
885};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/hfsplus/xattr.c
4 *
5 * Vyacheslav Dubeyko <slava@dubeyko.com>
6 *
7 * Logic of processing extended attributes
8 */
9
10#include "hfsplus_fs.h"
11#include <linux/nls.h>
12#include "xattr.h"
13
14static int hfsplus_removexattr(struct inode *inode, const char *name);
15
16const struct xattr_handler * const hfsplus_xattr_handlers[] = {
17 &hfsplus_xattr_osx_handler,
18 &hfsplus_xattr_user_handler,
19 &hfsplus_xattr_trusted_handler,
20 &hfsplus_xattr_security_handler,
21 NULL
22};
23
24static int strcmp_xattr_finder_info(const char *name)
25{
26 if (name) {
27 return strncmp(name, HFSPLUS_XATTR_FINDER_INFO_NAME,
28 sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME));
29 }
30 return -1;
31}
32
33static int strcmp_xattr_acl(const char *name)
34{
35 if (name) {
36 return strncmp(name, HFSPLUS_XATTR_ACL_NAME,
37 sizeof(HFSPLUS_XATTR_ACL_NAME));
38 }
39 return -1;
40}
41
42static bool is_known_namespace(const char *name)
43{
44 if (strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) &&
45 strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) &&
46 strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) &&
47 strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN))
48 return false;
49
50 return true;
51}
52
53static void hfsplus_init_header_node(struct inode *attr_file,
54 u32 clump_size,
55 char *buf, u16 node_size)
56{
57 struct hfs_bnode_desc *desc;
58 struct hfs_btree_header_rec *head;
59 u16 offset;
60 __be16 *rec_offsets;
61 u32 hdr_node_map_rec_bits;
62 char *bmp;
63 u32 used_nodes;
64 u32 used_bmp_bytes;
65 u64 tmp;
66
67 hfs_dbg(ATTR_MOD, "init_hdr_attr_file: clump %u, node_size %u\n",
68 clump_size, node_size);
69
70 /* The end of the node contains list of record offsets */
71 rec_offsets = (__be16 *)(buf + node_size);
72
73 desc = (struct hfs_bnode_desc *)buf;
74 desc->type = HFS_NODE_HEADER;
75 desc->num_recs = cpu_to_be16(HFSPLUS_BTREE_HDR_NODE_RECS_COUNT);
76 offset = sizeof(struct hfs_bnode_desc);
77 *--rec_offsets = cpu_to_be16(offset);
78
79 head = (struct hfs_btree_header_rec *)(buf + offset);
80 head->node_size = cpu_to_be16(node_size);
81 tmp = i_size_read(attr_file);
82 do_div(tmp, node_size);
83 head->node_count = cpu_to_be32(tmp);
84 head->free_nodes = cpu_to_be32(be32_to_cpu(head->node_count) - 1);
85 head->clump_size = cpu_to_be32(clump_size);
86 head->attributes |= cpu_to_be32(HFS_TREE_BIGKEYS | HFS_TREE_VARIDXKEYS);
87 head->max_key_len = cpu_to_be16(HFSPLUS_ATTR_KEYLEN - sizeof(u16));
88 offset += sizeof(struct hfs_btree_header_rec);
89 *--rec_offsets = cpu_to_be16(offset);
90 offset += HFSPLUS_BTREE_HDR_USER_BYTES;
91 *--rec_offsets = cpu_to_be16(offset);
92
93 hdr_node_map_rec_bits = 8 * (node_size - offset - (4 * sizeof(u16)));
94 if (be32_to_cpu(head->node_count) > hdr_node_map_rec_bits) {
95 u32 map_node_bits;
96 u32 map_nodes;
97
98 desc->next = cpu_to_be32(be32_to_cpu(head->leaf_tail) + 1);
99 map_node_bits = 8 * (node_size - sizeof(struct hfs_bnode_desc) -
100 (2 * sizeof(u16)) - 2);
101 map_nodes = (be32_to_cpu(head->node_count) -
102 hdr_node_map_rec_bits +
103 (map_node_bits - 1)) / map_node_bits;
104 be32_add_cpu(&head->free_nodes, 0 - map_nodes);
105 }
106
107 bmp = buf + offset;
108 used_nodes =
109 be32_to_cpu(head->node_count) - be32_to_cpu(head->free_nodes);
110 used_bmp_bytes = used_nodes / 8;
111 if (used_bmp_bytes) {
112 memset(bmp, 0xFF, used_bmp_bytes);
113 bmp += used_bmp_bytes;
114 used_nodes %= 8;
115 }
116 *bmp = ~(0xFF >> used_nodes);
117 offset += hdr_node_map_rec_bits / 8;
118 *--rec_offsets = cpu_to_be16(offset);
119}
120
121static int hfsplus_create_attributes_file(struct super_block *sb)
122{
123 int err = 0;
124 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
125 struct inode *attr_file;
126 struct hfsplus_inode_info *hip;
127 u32 clump_size;
128 u16 node_size = HFSPLUS_ATTR_TREE_NODE_SIZE;
129 char *buf;
130 int index, written;
131 struct address_space *mapping;
132 struct page *page;
133 int old_state = HFSPLUS_EMPTY_ATTR_TREE;
134
135 hfs_dbg(ATTR_MOD, "create_attr_file: ino %d\n", HFSPLUS_ATTR_CNID);
136
137check_attr_tree_state_again:
138 switch (atomic_read(&sbi->attr_tree_state)) {
139 case HFSPLUS_EMPTY_ATTR_TREE:
140 if (old_state != atomic_cmpxchg(&sbi->attr_tree_state,
141 old_state,
142 HFSPLUS_CREATING_ATTR_TREE))
143 goto check_attr_tree_state_again;
144 break;
145 case HFSPLUS_CREATING_ATTR_TREE:
146 /*
147 * This state means that another thread is in process
148 * of AttributesFile creation. Theoretically, it is
149 * possible to be here. But really __setxattr() method
150 * first of all calls hfs_find_init() for lookup in
151 * B-tree of CatalogFile. This method locks mutex of
152 * CatalogFile's B-tree. As a result, if some thread
153 * is inside AttributedFile creation operation then
154 * another threads will be waiting unlocking of
155 * CatalogFile's B-tree's mutex. However, if code will
156 * change then we will return error code (-EAGAIN) from
157 * here. Really, it means that first try to set of xattr
158 * fails with error but second attempt will have success.
159 */
160 return -EAGAIN;
161 case HFSPLUS_VALID_ATTR_TREE:
162 return 0;
163 case HFSPLUS_FAILED_ATTR_TREE:
164 return -EOPNOTSUPP;
165 default:
166 BUG();
167 }
168
169 attr_file = hfsplus_iget(sb, HFSPLUS_ATTR_CNID);
170 if (IS_ERR(attr_file)) {
171 pr_err("failed to load attributes file\n");
172 return PTR_ERR(attr_file);
173 }
174
175 BUG_ON(i_size_read(attr_file) != 0);
176
177 hip = HFSPLUS_I(attr_file);
178
179 clump_size = hfsplus_calc_btree_clump_size(sb->s_blocksize,
180 node_size,
181 sbi->sect_count,
182 HFSPLUS_ATTR_CNID);
183
184 mutex_lock(&hip->extents_lock);
185 hip->clump_blocks = clump_size >> sbi->alloc_blksz_shift;
186 mutex_unlock(&hip->extents_lock);
187
188 if (sbi->free_blocks <= (hip->clump_blocks << 1)) {
189 err = -ENOSPC;
190 goto end_attr_file_creation;
191 }
192
193 while (hip->alloc_blocks < hip->clump_blocks) {
194 err = hfsplus_file_extend(attr_file, false);
195 if (unlikely(err)) {
196 pr_err("failed to extend attributes file\n");
197 goto end_attr_file_creation;
198 }
199 hip->phys_size = attr_file->i_size =
200 (loff_t)hip->alloc_blocks << sbi->alloc_blksz_shift;
201 hip->fs_blocks = hip->alloc_blocks << sbi->fs_shift;
202 inode_set_bytes(attr_file, attr_file->i_size);
203 }
204
205 buf = kzalloc(node_size, GFP_NOFS);
206 if (!buf) {
207 err = -ENOMEM;
208 goto end_attr_file_creation;
209 }
210
211 hfsplus_init_header_node(attr_file, clump_size, buf, node_size);
212
213 mapping = attr_file->i_mapping;
214
215 index = 0;
216 written = 0;
217 for (; written < node_size; index++, written += PAGE_SIZE) {
218 void *kaddr;
219
220 page = read_mapping_page(mapping, index, NULL);
221 if (IS_ERR(page)) {
222 err = PTR_ERR(page);
223 goto failed_header_node_init;
224 }
225
226 kaddr = kmap_atomic(page);
227 memcpy(kaddr, buf + written,
228 min_t(size_t, PAGE_SIZE, node_size - written));
229 kunmap_atomic(kaddr);
230
231 set_page_dirty(page);
232 put_page(page);
233 }
234
235 hfsplus_mark_inode_dirty(attr_file, HFSPLUS_I_ATTR_DIRTY);
236
237 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
238 if (!sbi->attr_tree)
239 pr_err("failed to load attributes file\n");
240
241failed_header_node_init:
242 kfree(buf);
243
244end_attr_file_creation:
245 iput(attr_file);
246
247 if (!err)
248 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE);
249 else if (err == -ENOSPC)
250 atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE);
251 else
252 atomic_set(&sbi->attr_tree_state, HFSPLUS_FAILED_ATTR_TREE);
253
254 return err;
255}
256
257int __hfsplus_setxattr(struct inode *inode, const char *name,
258 const void *value, size_t size, int flags)
259{
260 int err;
261 struct hfs_find_data cat_fd;
262 hfsplus_cat_entry entry;
263 u16 cat_entry_flags, cat_entry_type;
264 u16 folder_finderinfo_len = sizeof(struct DInfo) +
265 sizeof(struct DXInfo);
266 u16 file_finderinfo_len = sizeof(struct FInfo) +
267 sizeof(struct FXInfo);
268
269 if ((!S_ISREG(inode->i_mode) &&
270 !S_ISDIR(inode->i_mode)) ||
271 HFSPLUS_IS_RSRC(inode))
272 return -EOPNOTSUPP;
273
274 if (value == NULL)
275 return hfsplus_removexattr(inode, name);
276
277 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd);
278 if (err) {
279 pr_err("can't init xattr find struct\n");
280 return err;
281 }
282
283 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
284 if (err) {
285 pr_err("catalog searching failed\n");
286 goto end_setxattr;
287 }
288
289 if (!strcmp_xattr_finder_info(name)) {
290 if (flags & XATTR_CREATE) {
291 pr_err("xattr exists yet\n");
292 err = -EOPNOTSUPP;
293 goto end_setxattr;
294 }
295 hfs_bnode_read(cat_fd.bnode, &entry, cat_fd.entryoffset,
296 sizeof(hfsplus_cat_entry));
297 if (be16_to_cpu(entry.type) == HFSPLUS_FOLDER) {
298 if (size == folder_finderinfo_len) {
299 memcpy(&entry.folder.info, value,
300 folder_finderinfo_len);
301 hfs_bnode_write(cat_fd.bnode, &entry,
302 cat_fd.entryoffset,
303 sizeof(struct hfsplus_cat_folder));
304 hfsplus_mark_inode_dirty(inode,
305 HFSPLUS_I_CAT_DIRTY);
306 } else {
307 err = -ERANGE;
308 goto end_setxattr;
309 }
310 } else if (be16_to_cpu(entry.type) == HFSPLUS_FILE) {
311 if (size == file_finderinfo_len) {
312 memcpy(&entry.file.info, value,
313 file_finderinfo_len);
314 hfs_bnode_write(cat_fd.bnode, &entry,
315 cat_fd.entryoffset,
316 sizeof(struct hfsplus_cat_file));
317 hfsplus_mark_inode_dirty(inode,
318 HFSPLUS_I_CAT_DIRTY);
319 } else {
320 err = -ERANGE;
321 goto end_setxattr;
322 }
323 } else {
324 err = -EOPNOTSUPP;
325 goto end_setxattr;
326 }
327 goto end_setxattr;
328 }
329
330 if (!HFSPLUS_SB(inode->i_sb)->attr_tree) {
331 err = hfsplus_create_attributes_file(inode->i_sb);
332 if (unlikely(err))
333 goto end_setxattr;
334 }
335
336 if (hfsplus_attr_exists(inode, name)) {
337 if (flags & XATTR_CREATE) {
338 pr_err("xattr exists yet\n");
339 err = -EOPNOTSUPP;
340 goto end_setxattr;
341 }
342 err = hfsplus_delete_attr(inode, name);
343 if (err)
344 goto end_setxattr;
345 err = hfsplus_create_attr(inode, name, value, size);
346 if (err)
347 goto end_setxattr;
348 } else {
349 if (flags & XATTR_REPLACE) {
350 pr_err("cannot replace xattr\n");
351 err = -EOPNOTSUPP;
352 goto end_setxattr;
353 }
354 err = hfsplus_create_attr(inode, name, value, size);
355 if (err)
356 goto end_setxattr;
357 }
358
359 cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset);
360 if (cat_entry_type == HFSPLUS_FOLDER) {
361 cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode,
362 cat_fd.entryoffset +
363 offsetof(struct hfsplus_cat_folder, flags));
364 cat_entry_flags |= HFSPLUS_XATTR_EXISTS;
365 if (!strcmp_xattr_acl(name))
366 cat_entry_flags |= HFSPLUS_ACL_EXISTS;
367 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
368 offsetof(struct hfsplus_cat_folder, flags),
369 cat_entry_flags);
370 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
371 } else if (cat_entry_type == HFSPLUS_FILE) {
372 cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode,
373 cat_fd.entryoffset +
374 offsetof(struct hfsplus_cat_file, flags));
375 cat_entry_flags |= HFSPLUS_XATTR_EXISTS;
376 if (!strcmp_xattr_acl(name))
377 cat_entry_flags |= HFSPLUS_ACL_EXISTS;
378 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
379 offsetof(struct hfsplus_cat_file, flags),
380 cat_entry_flags);
381 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
382 } else {
383 pr_err("invalid catalog entry type\n");
384 err = -EIO;
385 goto end_setxattr;
386 }
387
388end_setxattr:
389 hfs_find_exit(&cat_fd);
390 return err;
391}
392
393static int name_len(const char *xattr_name, int xattr_name_len)
394{
395 int len = xattr_name_len + 1;
396
397 if (!is_known_namespace(xattr_name))
398 len += XATTR_MAC_OSX_PREFIX_LEN;
399
400 return len;
401}
402
403static ssize_t copy_name(char *buffer, const char *xattr_name, int name_len)
404{
405 ssize_t len;
406
407 if (!is_known_namespace(xattr_name))
408 len = scnprintf(buffer, name_len + XATTR_MAC_OSX_PREFIX_LEN,
409 "%s%s", XATTR_MAC_OSX_PREFIX, xattr_name);
410 else
411 len = strscpy(buffer, xattr_name, name_len + 1);
412
413 /* include NUL-byte in length for non-empty name */
414 if (len >= 0)
415 len++;
416 return len;
417}
418
419int hfsplus_setxattr(struct inode *inode, const char *name,
420 const void *value, size_t size, int flags,
421 const char *prefix, size_t prefixlen)
422{
423 char *xattr_name;
424 int res;
425
426 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
427 GFP_KERNEL);
428 if (!xattr_name)
429 return -ENOMEM;
430 strcpy(xattr_name, prefix);
431 strcpy(xattr_name + prefixlen, name);
432 res = __hfsplus_setxattr(inode, xattr_name, value, size, flags);
433 kfree(xattr_name);
434 return res;
435}
436
437static ssize_t hfsplus_getxattr_finder_info(struct inode *inode,
438 void *value, size_t size)
439{
440 ssize_t res = 0;
441 struct hfs_find_data fd;
442 u16 entry_type;
443 u16 folder_rec_len = sizeof(struct DInfo) + sizeof(struct DXInfo);
444 u16 file_rec_len = sizeof(struct FInfo) + sizeof(struct FXInfo);
445 u16 record_len = max(folder_rec_len, file_rec_len);
446 u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)];
447 u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)];
448
449 if (size >= record_len) {
450 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
451 if (res) {
452 pr_err("can't init xattr find struct\n");
453 return res;
454 }
455 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
456 if (res)
457 goto end_getxattr_finder_info;
458 entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
459
460 if (entry_type == HFSPLUS_FOLDER) {
461 hfs_bnode_read(fd.bnode, folder_finder_info,
462 fd.entryoffset +
463 offsetof(struct hfsplus_cat_folder, user_info),
464 folder_rec_len);
465 memcpy(value, folder_finder_info, folder_rec_len);
466 res = folder_rec_len;
467 } else if (entry_type == HFSPLUS_FILE) {
468 hfs_bnode_read(fd.bnode, file_finder_info,
469 fd.entryoffset +
470 offsetof(struct hfsplus_cat_file, user_info),
471 file_rec_len);
472 memcpy(value, file_finder_info, file_rec_len);
473 res = file_rec_len;
474 } else {
475 res = -EOPNOTSUPP;
476 goto end_getxattr_finder_info;
477 }
478 } else
479 res = size ? -ERANGE : record_len;
480
481end_getxattr_finder_info:
482 if (size >= record_len)
483 hfs_find_exit(&fd);
484 return res;
485}
486
487ssize_t __hfsplus_getxattr(struct inode *inode, const char *name,
488 void *value, size_t size)
489{
490 struct hfs_find_data fd;
491 hfsplus_attr_entry *entry;
492 __be32 xattr_record_type;
493 u32 record_type;
494 u16 record_length = 0;
495 ssize_t res;
496
497 if ((!S_ISREG(inode->i_mode) &&
498 !S_ISDIR(inode->i_mode)) ||
499 HFSPLUS_IS_RSRC(inode))
500 return -EOPNOTSUPP;
501
502 if (!strcmp_xattr_finder_info(name))
503 return hfsplus_getxattr_finder_info(inode, value, size);
504
505 if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
506 return -EOPNOTSUPP;
507
508 entry = hfsplus_alloc_attr_entry();
509 if (!entry) {
510 pr_err("can't allocate xattr entry\n");
511 return -ENOMEM;
512 }
513
514 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd);
515 if (res) {
516 pr_err("can't init xattr find struct\n");
517 goto failed_getxattr_init;
518 }
519
520 res = hfsplus_find_attr(inode->i_sb, inode->i_ino, name, &fd);
521 if (res) {
522 if (res == -ENOENT)
523 res = -ENODATA;
524 else
525 pr_err("xattr searching failed\n");
526 goto out;
527 }
528
529 hfs_bnode_read(fd.bnode, &xattr_record_type,
530 fd.entryoffset, sizeof(xattr_record_type));
531 record_type = be32_to_cpu(xattr_record_type);
532 if (record_type == HFSPLUS_ATTR_INLINE_DATA) {
533 record_length = hfs_bnode_read_u16(fd.bnode,
534 fd.entryoffset +
535 offsetof(struct hfsplus_attr_inline_data,
536 length));
537 if (record_length > HFSPLUS_MAX_INLINE_DATA_SIZE) {
538 pr_err("invalid xattr record size\n");
539 res = -EIO;
540 goto out;
541 }
542 } else if (record_type == HFSPLUS_ATTR_FORK_DATA ||
543 record_type == HFSPLUS_ATTR_EXTENTS) {
544 pr_err("only inline data xattr are supported\n");
545 res = -EOPNOTSUPP;
546 goto out;
547 } else {
548 pr_err("invalid xattr record\n");
549 res = -EIO;
550 goto out;
551 }
552
553 if (size) {
554 hfs_bnode_read(fd.bnode, entry, fd.entryoffset,
555 offsetof(struct hfsplus_attr_inline_data,
556 raw_bytes) + record_length);
557 }
558
559 if (size >= record_length) {
560 memcpy(value, entry->inline_data.raw_bytes, record_length);
561 res = record_length;
562 } else
563 res = size ? -ERANGE : record_length;
564
565out:
566 hfs_find_exit(&fd);
567
568failed_getxattr_init:
569 hfsplus_destroy_attr_entry(entry);
570 return res;
571}
572
573ssize_t hfsplus_getxattr(struct inode *inode, const char *name,
574 void *value, size_t size,
575 const char *prefix, size_t prefixlen)
576{
577 int res;
578 char *xattr_name;
579
580 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
581 GFP_KERNEL);
582 if (!xattr_name)
583 return -ENOMEM;
584
585 strcpy(xattr_name, prefix);
586 strcpy(xattr_name + prefixlen, name);
587
588 res = __hfsplus_getxattr(inode, xattr_name, value, size);
589 kfree(xattr_name);
590 return res;
591
592}
593
594static inline int can_list(const char *xattr_name)
595{
596 if (!xattr_name)
597 return 0;
598
599 return strncmp(xattr_name, XATTR_TRUSTED_PREFIX,
600 XATTR_TRUSTED_PREFIX_LEN) ||
601 capable(CAP_SYS_ADMIN);
602}
603
604static ssize_t hfsplus_listxattr_finder_info(struct dentry *dentry,
605 char *buffer, size_t size)
606{
607 ssize_t res;
608 struct inode *inode = d_inode(dentry);
609 struct hfs_find_data fd;
610 u16 entry_type;
611 u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)];
612 u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)];
613 unsigned long len, found_bit;
614 int xattr_name_len, symbols_count;
615
616 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
617 if (res) {
618 pr_err("can't init xattr find struct\n");
619 return res;
620 }
621
622 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
623 if (res)
624 goto end_listxattr_finder_info;
625
626 entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
627 if (entry_type == HFSPLUS_FOLDER) {
628 len = sizeof(struct DInfo) + sizeof(struct DXInfo);
629 hfs_bnode_read(fd.bnode, folder_finder_info,
630 fd.entryoffset +
631 offsetof(struct hfsplus_cat_folder, user_info),
632 len);
633 found_bit = find_first_bit((void *)folder_finder_info, len*8);
634 } else if (entry_type == HFSPLUS_FILE) {
635 len = sizeof(struct FInfo) + sizeof(struct FXInfo);
636 hfs_bnode_read(fd.bnode, file_finder_info,
637 fd.entryoffset +
638 offsetof(struct hfsplus_cat_file, user_info),
639 len);
640 found_bit = find_first_bit((void *)file_finder_info, len*8);
641 } else {
642 res = -EOPNOTSUPP;
643 goto end_listxattr_finder_info;
644 }
645
646 if (found_bit >= (len*8))
647 res = 0;
648 else {
649 symbols_count = sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME) - 1;
650 xattr_name_len =
651 name_len(HFSPLUS_XATTR_FINDER_INFO_NAME, symbols_count);
652 if (!buffer || !size) {
653 if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME))
654 res = xattr_name_len;
655 } else if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME)) {
656 if (size < xattr_name_len)
657 res = -ERANGE;
658 else {
659 res = copy_name(buffer,
660 HFSPLUS_XATTR_FINDER_INFO_NAME,
661 symbols_count);
662 }
663 }
664 }
665
666end_listxattr_finder_info:
667 hfs_find_exit(&fd);
668
669 return res;
670}
671
672ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
673{
674 ssize_t err;
675 ssize_t res;
676 struct inode *inode = d_inode(dentry);
677 struct hfs_find_data fd;
678 struct hfsplus_attr_key attr_key;
679 char *strbuf;
680 int xattr_name_len;
681
682 if ((!S_ISREG(inode->i_mode) &&
683 !S_ISDIR(inode->i_mode)) ||
684 HFSPLUS_IS_RSRC(inode))
685 return -EOPNOTSUPP;
686
687 res = hfsplus_listxattr_finder_info(dentry, buffer, size);
688 if (res < 0)
689 return res;
690 else if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
691 return (res == 0) ? -EOPNOTSUPP : res;
692
693 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd);
694 if (err) {
695 pr_err("can't init xattr find struct\n");
696 return err;
697 }
698
699 strbuf = kzalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN +
700 XATTR_MAC_OSX_PREFIX_LEN + 1, GFP_KERNEL);
701 if (!strbuf) {
702 res = -ENOMEM;
703 goto out;
704 }
705
706 err = hfsplus_find_attr(inode->i_sb, inode->i_ino, NULL, &fd);
707 if (err) {
708 if (err == -ENOENT) {
709 if (res == 0)
710 res = -ENODATA;
711 goto end_listxattr;
712 } else {
713 res = err;
714 goto end_listxattr;
715 }
716 }
717
718 for (;;) {
719 u16 key_len = hfs_bnode_read_u16(fd.bnode, fd.keyoffset);
720
721 if (key_len == 0 || key_len > fd.tree->max_key_len) {
722 pr_err("invalid xattr key length: %d\n", key_len);
723 res = -EIO;
724 goto end_listxattr;
725 }
726
727 hfs_bnode_read(fd.bnode, &attr_key,
728 fd.keyoffset, key_len + sizeof(key_len));
729
730 if (be32_to_cpu(attr_key.cnid) != inode->i_ino)
731 goto end_listxattr;
732
733 xattr_name_len = NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN;
734 if (hfsplus_uni2asc(inode->i_sb,
735 (const struct hfsplus_unistr *)&fd.key->attr.key_name,
736 strbuf, &xattr_name_len)) {
737 pr_err("unicode conversion failed\n");
738 res = -EIO;
739 goto end_listxattr;
740 }
741
742 if (!buffer || !size) {
743 if (can_list(strbuf))
744 res += name_len(strbuf, xattr_name_len);
745 } else if (can_list(strbuf)) {
746 if (size < (res + name_len(strbuf, xattr_name_len))) {
747 res = -ERANGE;
748 goto end_listxattr;
749 } else
750 res += copy_name(buffer + res,
751 strbuf, xattr_name_len);
752 }
753
754 if (hfs_brec_goto(&fd, 1))
755 goto end_listxattr;
756 }
757
758end_listxattr:
759 kfree(strbuf);
760out:
761 hfs_find_exit(&fd);
762 return res;
763}
764
765static int hfsplus_removexattr(struct inode *inode, const char *name)
766{
767 int err;
768 struct hfs_find_data cat_fd;
769 u16 flags;
770 u16 cat_entry_type;
771 int is_xattr_acl_deleted;
772 int is_all_xattrs_deleted;
773
774 if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
775 return -EOPNOTSUPP;
776
777 if (!strcmp_xattr_finder_info(name))
778 return -EOPNOTSUPP;
779
780 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd);
781 if (err) {
782 pr_err("can't init xattr find struct\n");
783 return err;
784 }
785
786 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
787 if (err) {
788 pr_err("catalog searching failed\n");
789 goto end_removexattr;
790 }
791
792 err = hfsplus_delete_attr(inode, name);
793 if (err)
794 goto end_removexattr;
795
796 is_xattr_acl_deleted = !strcmp_xattr_acl(name);
797 is_all_xattrs_deleted = !hfsplus_attr_exists(inode, NULL);
798
799 if (!is_xattr_acl_deleted && !is_all_xattrs_deleted)
800 goto end_removexattr;
801
802 cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset);
803
804 if (cat_entry_type == HFSPLUS_FOLDER) {
805 flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset +
806 offsetof(struct hfsplus_cat_folder, flags));
807 if (is_xattr_acl_deleted)
808 flags &= ~HFSPLUS_ACL_EXISTS;
809 if (is_all_xattrs_deleted)
810 flags &= ~HFSPLUS_XATTR_EXISTS;
811 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
812 offsetof(struct hfsplus_cat_folder, flags),
813 flags);
814 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
815 } else if (cat_entry_type == HFSPLUS_FILE) {
816 flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset +
817 offsetof(struct hfsplus_cat_file, flags));
818 if (is_xattr_acl_deleted)
819 flags &= ~HFSPLUS_ACL_EXISTS;
820 if (is_all_xattrs_deleted)
821 flags &= ~HFSPLUS_XATTR_EXISTS;
822 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
823 offsetof(struct hfsplus_cat_file, flags),
824 flags);
825 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
826 } else {
827 pr_err("invalid catalog entry type\n");
828 err = -EIO;
829 goto end_removexattr;
830 }
831
832end_removexattr:
833 hfs_find_exit(&cat_fd);
834 return err;
835}
836
837static int hfsplus_osx_getxattr(const struct xattr_handler *handler,
838 struct dentry *unused, struct inode *inode,
839 const char *name, void *buffer, size_t size)
840{
841 /*
842 * Don't allow retrieving properly prefixed attributes
843 * by prepending them with "osx."
844 */
845 if (is_known_namespace(name))
846 return -EOPNOTSUPP;
847
848 /*
849 * osx is the namespace we use to indicate an unprefixed
850 * attribute on the filesystem (like the ones that OS X
851 * creates), so we pass the name through unmodified (after
852 * ensuring it doesn't conflict with another namespace).
853 */
854 return __hfsplus_getxattr(inode, name, buffer, size);
855}
856
857static int hfsplus_osx_setxattr(const struct xattr_handler *handler,
858 struct mnt_idmap *idmap,
859 struct dentry *unused, struct inode *inode,
860 const char *name, const void *buffer,
861 size_t size, int flags)
862{
863 /*
864 * Don't allow setting properly prefixed attributes
865 * by prepending them with "osx."
866 */
867 if (is_known_namespace(name))
868 return -EOPNOTSUPP;
869
870 /*
871 * osx is the namespace we use to indicate an unprefixed
872 * attribute on the filesystem (like the ones that OS X
873 * creates), so we pass the name through unmodified (after
874 * ensuring it doesn't conflict with another namespace).
875 */
876 return __hfsplus_setxattr(inode, name, buffer, size, flags);
877}
878
879const struct xattr_handler hfsplus_xattr_osx_handler = {
880 .prefix = XATTR_MAC_OSX_PREFIX,
881 .get = hfsplus_osx_getxattr,
882 .set = hfsplus_osx_setxattr,
883};