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
14 static int hfsplus_removexattr(struct inode *inode, const char *name);
15
16 const 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
strcmp_xattr_finder_info(const char * name)24 static 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
strcmp_xattr_acl(const char * name)33 static 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
is_known_namespace(const char * name)42 static 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
hfsplus_init_header_node(struct inode * attr_file,u32 clump_size,char * buf,u16 node_size)53 static 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
hfsplus_create_attributes_file(struct super_block * sb)121 static 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
137 check_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
241 failed_header_node_init:
242 kfree(buf);
243
244 end_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
__hfsplus_setxattr(struct inode * inode,const char * name,const void * value,size_t size,int flags)257 int __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
388 end_setxattr:
389 hfs_find_exit(&cat_fd);
390 return err;
391 }
392
name_len(const char * xattr_name,int xattr_name_len)393 static 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
copy_name(char * buffer,const char * xattr_name,int name_len)403 static 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
hfsplus_setxattr(struct inode * inode,const char * name,const void * value,size_t size,int flags,const char * prefix,size_t prefixlen)419 int 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
hfsplus_getxattr_finder_info(struct inode * inode,void * value,size_t size)437 static 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
481 end_getxattr_finder_info:
482 if (size >= record_len)
483 hfs_find_exit(&fd);
484 return res;
485 }
486
__hfsplus_getxattr(struct inode * inode,const char * name,void * value,size_t size)487 ssize_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
565 out:
566 hfs_find_exit(&fd);
567
568 failed_getxattr_init:
569 hfsplus_destroy_attr_entry(entry);
570 return res;
571 }
572
hfsplus_getxattr(struct inode * inode,const char * name,void * value,size_t size,const char * prefix,size_t prefixlen)573 ssize_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
can_list(const char * xattr_name)594 static 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
hfsplus_listxattr_finder_info(struct dentry * dentry,char * buffer,size_t size)604 static 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
666 end_listxattr_finder_info:
667 hfs_find_exit(&fd);
668
669 return res;
670 }
671
hfsplus_listxattr(struct dentry * dentry,char * buffer,size_t size)672 ssize_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
758 end_listxattr:
759 kfree(strbuf);
760 out:
761 hfs_find_exit(&fd);
762 return res;
763 }
764
hfsplus_removexattr(struct inode * inode,const char * name)765 static 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
832 end_removexattr:
833 hfs_find_exit(&cat_fd);
834 return err;
835 }
836
hfsplus_osx_getxattr(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,void * buffer,size_t size)837 static 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
hfsplus_osx_setxattr(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * name,const void * buffer,size_t size,int flags)857 static 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
879 const struct xattr_handler hfsplus_xattr_osx_handler = {
880 .prefix = XATTR_MAC_OSX_PREFIX,
881 .get = hfsplus_osx_getxattr,
882 .set = hfsplus_osx_setxattr,
883 };
884