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proc: prevent accessing /proc/<PID>/environ until it's ready
[deliverable/linux.git] / fs / hfsplus / xattr.c
CommitLineData
127e5f5a
VD		 1/*
2 * linux/fs/hfsplus/xattr.c
3 *
4 * Vyacheslav Dubeyko <slava@dubeyko.com>
5 *
6 * Logic of processing extended attributes
7 */
8
9#include "hfsplus_fs.h"
b0a7ab57 10#include <linux/posix_acl_xattr.h>
017f8da4 11#include <linux/nls.h>
127e5f5a 12#include "xattr.h"
b4c1107c 13#include "acl.h"
127e5f5a 14
b168fff7
CH		 15static int hfsplus_removexattr(struct inode *inode, const char *name);
16
127e5f5a
VD		 17const struct xattr_handler *hfsplus_xattr_handlers[] = {
18 &hfsplus_xattr_osx_handler,
19 &hfsplus_xattr_user_handler,
20 &hfsplus_xattr_trusted_handler,
b4c1107c 21#ifdef CONFIG_HFSPLUS_FS_POSIX_ACL
b0a7ab57
CH		 22 &posix_acl_access_xattr_handler,
23 &posix_acl_default_xattr_handler,
b4c1107c 24#endif
127e5f5a
VD		 25 &hfsplus_xattr_security_handler,
26 NULL
27};
28
29static int strcmp_xattr_finder_info(const char *name)
30{
31 if (name) {
32 return strncmp(name, HFSPLUS_XATTR_FINDER_INFO_NAME,
33 sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME));
34 }
35 return -1;
36}
37
38static int strcmp_xattr_acl(const char *name)
39{
40 if (name) {
41 return strncmp(name, HFSPLUS_XATTR_ACL_NAME,
42 sizeof(HFSPLUS_XATTR_ACL_NAME));
43 }
44 return -1;
45}
46
1ad8d63d 47static bool is_known_namespace(const char *name)
127e5f5a
VD		 48{
49 if (strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) &&
50 strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) &&
51 strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) &&
52 strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN))
53 return false;
54
55 return true;
56}
57
099e9245
VD		 58static void hfsplus_init_header_node(struct inode *attr_file,
59 u32 clump_size,
a99b7069 60 char *buf, u16 node_size)
099e9245
VD		 61{
62 struct hfs_bnode_desc *desc;
63 struct hfs_btree_header_rec *head;
64 u16 offset;
65 __be16 *rec_offsets;
66 u32 hdr_node_map_rec_bits;
67 char *bmp;
68 u32 used_nodes;
69 u32 used_bmp_bytes;
df3d4e7a 70 u64 tmp;
099e9245 71
a99b7069 72 hfs_dbg(ATTR_MOD, "init_hdr_attr_file: clump %u, node_size %u\n",
b73f3d0e 73 clump_size, node_size);
099e9245
VD		 74
75 /* The end of the node contains list of record offsets */
76 rec_offsets = (__be16 *)(buf + node_size);
77
78 desc = (struct hfs_bnode_desc *)buf;
79 desc->type = HFS_NODE_HEADER;
80 desc->num_recs = cpu_to_be16(HFSPLUS_BTREE_HDR_NODE_RECS_COUNT);
81 offset = sizeof(struct hfs_bnode_desc);
82 *--rec_offsets = cpu_to_be16(offset);
83
84 head = (struct hfs_btree_header_rec *)(buf + offset);
85 head->node_size = cpu_to_be16(node_size);
a99b7069
GU		 86 tmp = i_size_read(attr_file);
87 do_div(tmp, node_size);
88 head->node_count = cpu_to_be32(tmp);
099e9245
VD		 89 head->free_nodes = cpu_to_be32(be32_to_cpu(head->node_count) - 1);
90 head->clump_size = cpu_to_be32(clump_size);
91 head->attributes |= cpu_to_be32(HFS_TREE_BIGKEYS | HFS_TREE_VARIDXKEYS);
92 head->max_key_len = cpu_to_be16(HFSPLUS_ATTR_KEYLEN - sizeof(u16));
93 offset += sizeof(struct hfs_btree_header_rec);
94 *--rec_offsets = cpu_to_be16(offset);
95 offset += HFSPLUS_BTREE_HDR_USER_BYTES;
96 *--rec_offsets = cpu_to_be16(offset);
97
98 hdr_node_map_rec_bits = 8 * (node_size - offset - (4 * sizeof(u16)));
99 if (be32_to_cpu(head->node_count) > hdr_node_map_rec_bits) {
100 u32 map_node_bits;
101 u32 map_nodes;
102
103 desc->next = cpu_to_be32(be32_to_cpu(head->leaf_tail) + 1);
104 map_node_bits = 8 * (node_size - sizeof(struct hfs_bnode_desc) -
105 (2 * sizeof(u16)) - 2);
106 map_nodes = (be32_to_cpu(head->node_count) -
107 hdr_node_map_rec_bits +
108 (map_node_bits - 1)) / map_node_bits;
109 be32_add_cpu(&head->free_nodes, 0 - map_nodes);
110 }
111
112 bmp = buf + offset;
113 used_nodes =
114 be32_to_cpu(head->node_count) - be32_to_cpu(head->free_nodes);
115 used_bmp_bytes = used_nodes / 8;
116 if (used_bmp_bytes) {
117 memset(bmp, 0xFF, used_bmp_bytes);
118 bmp += used_bmp_bytes;
119 used_nodes %= 8;
120 }
121 *bmp = ~(0xFF >> used_nodes);
122 offset += hdr_node_map_rec_bits / 8;
123 *--rec_offsets = cpu_to_be16(offset);
124}
125
95e0d7db
VD		 126static int hfsplus_create_attributes_file(struct super_block *sb)
127{
128 int err = 0;
129 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
130 struct inode *attr_file;
131 struct hfsplus_inode_info *hip;
132 u32 clump_size;
133 u16 node_size = HFSPLUS_ATTR_TREE_NODE_SIZE;
134 char *buf;
135 int index, written;
136 struct address_space *mapping;
137 struct page *page;
138 int old_state = HFSPLUS_EMPTY_ATTR_TREE;
139
140 hfs_dbg(ATTR_MOD, "create_attr_file: ino %d\n", HFSPLUS_ATTR_CNID);
141
142check_attr_tree_state_again:
143 switch (atomic_read(&sbi->attr_tree_state)) {
144 case HFSPLUS_EMPTY_ATTR_TREE:
145 if (old_state != atomic_cmpxchg(&sbi->attr_tree_state,
146 old_state,
147 HFSPLUS_CREATING_ATTR_TREE))
148 goto check_attr_tree_state_again;
149 break;
150 case HFSPLUS_CREATING_ATTR_TREE:
151 /*
152 * This state means that another thread is in process
153 * of AttributesFile creation. Theoretically, it is
154 * possible to be here. But really __setxattr() method
155 * first of all calls hfs_find_init() for lookup in
156 * B-tree of CatalogFile. This method locks mutex of
157 * CatalogFile's B-tree. As a result, if some thread
158 * is inside AttributedFile creation operation then
159 * another threads will be waiting unlocking of
160 * CatalogFile's B-tree's mutex. However, if code will
161 * change then we will return error code (-EAGAIN) from
162 * here. Really, it means that first try to set of xattr
163 * fails with error but second attempt will have success.
164 */
165 return -EAGAIN;
166 case HFSPLUS_VALID_ATTR_TREE:
167 return 0;
168 case HFSPLUS_FAILED_ATTR_TREE:
169 return -EOPNOTSUPP;
170 default:
171 BUG();
172 }
173
174 attr_file = hfsplus_iget(sb, HFSPLUS_ATTR_CNID);
175 if (IS_ERR(attr_file)) {
176 pr_err("failed to load attributes file\n");
177 return PTR_ERR(attr_file);
178 }
179
180 BUG_ON(i_size_read(attr_file) != 0);
181
182 hip = HFSPLUS_I(attr_file);
183
184 clump_size = hfsplus_calc_btree_clump_size(sb->s_blocksize,
185 node_size,
186 sbi->sect_count,
187 HFSPLUS_ATTR_CNID);
188
189 mutex_lock(&hip->extents_lock);
190 hip->clump_blocks = clump_size >> sbi->alloc_blksz_shift;
191 mutex_unlock(&hip->extents_lock);
192
193 if (sbi->free_blocks <= (hip->clump_blocks << 1)) {
194 err = -ENOSPC;
195 goto end_attr_file_creation;
196 }
197
198 while (hip->alloc_blocks < hip->clump_blocks) {
2cd282a1 199 err = hfsplus_file_extend(attr_file, false);
95e0d7db
VD		 200 if (unlikely(err)) {
201 pr_err("failed to extend attributes file\n");
202 goto end_attr_file_creation;
203 }
204 hip->phys_size = attr_file->i_size =
205 (loff_t)hip->alloc_blocks << sbi->alloc_blksz_shift;
206 hip->fs_blocks = hip->alloc_blocks << sbi->fs_shift;
207 inode_set_bytes(attr_file, attr_file->i_size);
208 }
209
210 buf = kzalloc(node_size, GFP_NOFS);
211 if (!buf) {
212 pr_err("failed to allocate memory for header node\n");
213 err = -ENOMEM;
214 goto end_attr_file_creation;
215 }
216
217 hfsplus_init_header_node(attr_file, clump_size, buf, node_size);
218
219 mapping = attr_file->i_mapping;
220
221 index = 0;
222 written = 0;
09cbfeaf 223 for (; written < node_size; index++, written += PAGE_SIZE) {
95e0d7db
VD		 224 void *kaddr;
225
226 page = read_mapping_page(mapping, index, NULL);
227 if (IS_ERR(page)) {
228 err = PTR_ERR(page);
229 goto failed_header_node_init;
230 }
231
232 kaddr = kmap_atomic(page);
233 memcpy(kaddr, buf + written,
09cbfeaf 234 min_t(size_t, PAGE_SIZE, node_size - written));
95e0d7db
VD		 235 kunmap_atomic(kaddr);
236
237 set_page_dirty(page);
09cbfeaf 238 put_page(page);
95e0d7db
VD		 239 }
240
241 hfsplus_mark_inode_dirty(attr_file, HFSPLUS_I_ATTR_DIRTY);
242
243 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
244 if (!sbi->attr_tree)
245 pr_err("failed to load attributes file\n");
246
247failed_header_node_init:
248 kfree(buf);
249
250end_attr_file_creation:
251 iput(attr_file);
252
253 if (!err)
254 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE);
255 else if (err == -ENOSPC)
256 atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE);
257 else
258 atomic_set(&sbi->attr_tree_state, HFSPLUS_FAILED_ATTR_TREE);
259
260 return err;
261}
262
127e5f5a
VD		 263int __hfsplus_setxattr(struct inode *inode, const char *name,
264 const void *value, size_t size, int flags)
265{
266 int err = 0;
267 struct hfs_find_data cat_fd;
268 hfsplus_cat_entry entry;
269 u16 cat_entry_flags, cat_entry_type;
270 u16 folder_finderinfo_len = sizeof(struct DInfo) +
271 sizeof(struct DXInfo);
272 u16 file_finderinfo_len = sizeof(struct FInfo) +
273 sizeof(struct FXInfo);
274
275 if ((!S_ISREG(inode->i_mode) &&
276 !S_ISDIR(inode->i_mode)) ||
277 HFSPLUS_IS_RSRC(inode))
278 return -EOPNOTSUPP;
279
b168fff7
CH		 280 if (value == NULL)
281 return hfsplus_removexattr(inode, name);
127e5f5a
VD		 282
283 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd);
284 if (err) {
d6142673 285 pr_err("can't init xattr find struct\n");
127e5f5a
VD		 286 return err;
287 }
288
289 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
290 if (err) {
d6142673 291 pr_err("catalog searching failed\n");
127e5f5a
VD		 292 goto end_setxattr;
293 }
294
295 if (!strcmp_xattr_finder_info(name)) {
296 if (flags & XATTR_CREATE) {
d6142673 297 pr_err("xattr exists yet\n");
127e5f5a
VD		 298 err = -EOPNOTSUPP;
299 goto end_setxattr;
300 }
301 hfs_bnode_read(cat_fd.bnode, &entry, cat_fd.entryoffset,
302 sizeof(hfsplus_cat_entry));
303 if (be16_to_cpu(entry.type) == HFSPLUS_FOLDER) {
304 if (size == folder_finderinfo_len) {
305 memcpy(&entry.folder.user_info, value,
306 folder_finderinfo_len);
307 hfs_bnode_write(cat_fd.bnode, &entry,
308 cat_fd.entryoffset,
309 sizeof(struct hfsplus_cat_folder));
310 hfsplus_mark_inode_dirty(inode,
311 HFSPLUS_I_CAT_DIRTY);
312 } else {
313 err = -ERANGE;
314 goto end_setxattr;
315 }
316 } else if (be16_to_cpu(entry.type) == HFSPLUS_FILE) {
317 if (size == file_finderinfo_len) {
318 memcpy(&entry.file.user_info, value,
319 file_finderinfo_len);
320 hfs_bnode_write(cat_fd.bnode, &entry,
321 cat_fd.entryoffset,
322 sizeof(struct hfsplus_cat_file));
323 hfsplus_mark_inode_dirty(inode,
324 HFSPLUS_I_CAT_DIRTY);
325 } else {
326 err = -ERANGE;
327 goto end_setxattr;
328 }
329 } else {
330 err = -EOPNOTSUPP;
331 goto end_setxattr;
332 }
333 goto end_setxattr;
334 }
335
336 if (!HFSPLUS_SB(inode->i_sb)->attr_tree) {
95e0d7db
VD		 337 err = hfsplus_create_attributes_file(inode->i_sb);
338 if (unlikely(err))
339 goto end_setxattr;
127e5f5a
VD		 340 }
341
342 if (hfsplus_attr_exists(inode, name)) {
343 if (flags & XATTR_CREATE) {
d6142673 344 pr_err("xattr exists yet\n");
127e5f5a
VD		 345 err = -EOPNOTSUPP;
346 goto end_setxattr;
347 }
348 err = hfsplus_delete_attr(inode, name);
349 if (err)
350 goto end_setxattr;
351 err = hfsplus_create_attr(inode, name, value, size);
352 if (err)
353 goto end_setxattr;
354 } else {
355 if (flags & XATTR_REPLACE) {
d6142673 356 pr_err("cannot replace xattr\n");
127e5f5a
VD		 357 err = -EOPNOTSUPP;
358 goto end_setxattr;
359 }
360 err = hfsplus_create_attr(inode, name, value, size);
361 if (err)
362 goto end_setxattr;
363 }
364
365 cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset);
366 if (cat_entry_type == HFSPLUS_FOLDER) {
367 cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode,
368 cat_fd.entryoffset +
369 offsetof(struct hfsplus_cat_folder, flags));
370 cat_entry_flags |= HFSPLUS_XATTR_EXISTS;
371 if (!strcmp_xattr_acl(name))
372 cat_entry_flags |= HFSPLUS_ACL_EXISTS;
373 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
374 offsetof(struct hfsplus_cat_folder, flags),
375 cat_entry_flags);
376 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
377 } else if (cat_entry_type == HFSPLUS_FILE) {
378 cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode,
379 cat_fd.entryoffset +
380 offsetof(struct hfsplus_cat_file, flags));
381 cat_entry_flags |= HFSPLUS_XATTR_EXISTS;
382 if (!strcmp_xattr_acl(name))
383 cat_entry_flags |= HFSPLUS_ACL_EXISTS;
384 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
385 offsetof(struct hfsplus_cat_file, flags),
386 cat_entry_flags);
387 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
388 } else {
d6142673 389 pr_err("invalid catalog entry type\n");
127e5f5a
VD		 390 err = -EIO;
391 goto end_setxattr;
392 }
393
394end_setxattr:
395 hfs_find_exit(&cat_fd);
396 return err;
397}
398
127e5f5a
VD		 399static int name_len(const char *xattr_name, int xattr_name_len)
400{
401 int len = xattr_name_len + 1;
402
b168fff7 403 if (!is_known_namespace(xattr_name))
127e5f5a
VD		 404 len += XATTR_MAC_OSX_PREFIX_LEN;
405
406 return len;
407}
408
409static int copy_name(char *buffer, const char *xattr_name, int name_len)
410{
411 int len = name_len;
412 int offset = 0;
413
b168fff7 414 if (!is_known_namespace(xattr_name)) {
127e5f5a
VD		 415 strncpy(buffer, XATTR_MAC_OSX_PREFIX, XATTR_MAC_OSX_PREFIX_LEN);
416 offset += XATTR_MAC_OSX_PREFIX_LEN;
417 len += XATTR_MAC_OSX_PREFIX_LEN;
418 }
419
420 strncpy(buffer + offset, xattr_name, name_len);
421 memset(buffer + offset + name_len, 0, 1);
422 len += 1;
423
424 return len;
425}
426
5e61473e
FF		 427int hfsplus_setxattr(struct dentry *dentry, const char *name,
428 const void *value, size_t size, int flags,
429 const char *prefix, size_t prefixlen)
430{
431 char *xattr_name;
432 int res;
433
5e61473e
FF		 434 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
435 GFP_KERNEL);
436 if (!xattr_name)
437 return -ENOMEM;
438 strcpy(xattr_name, prefix);
439 strcpy(xattr_name + prefixlen, name);
9ec3a646 440 res = __hfsplus_setxattr(d_inode(dentry), xattr_name, value, size,
5e61473e
FF		 441 flags);
442 kfree(xattr_name);
443 return res;
444}
445
b4c1107c 446static ssize_t hfsplus_getxattr_finder_info(struct inode *inode,
127e5f5a
VD		 447 void *value, size_t size)
448{
449 ssize_t res = 0;
127e5f5a
VD		 450 struct hfs_find_data fd;
451 u16 entry_type;
452 u16 folder_rec_len = sizeof(struct DInfo) + sizeof(struct DXInfo);
453 u16 file_rec_len = sizeof(struct FInfo) + sizeof(struct FXInfo);
454 u16 record_len = max(folder_rec_len, file_rec_len);
455 u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)];
456 u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)];
457
458 if (size >= record_len) {
459 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
460 if (res) {
d6142673 461 pr_err("can't init xattr find struct\n");
127e5f5a
VD		 462 return res;
463 }
464 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
465 if (res)
466 goto end_getxattr_finder_info;
467 entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
468
469 if (entry_type == HFSPLUS_FOLDER) {
470 hfs_bnode_read(fd.bnode, folder_finder_info,
471 fd.entryoffset +
472 offsetof(struct hfsplus_cat_folder, user_info),
473 folder_rec_len);
474 memcpy(value, folder_finder_info, folder_rec_len);
475 res = folder_rec_len;
476 } else if (entry_type == HFSPLUS_FILE) {
477 hfs_bnode_read(fd.bnode, file_finder_info,
478 fd.entryoffset +
479 offsetof(struct hfsplus_cat_file, user_info),
480 file_rec_len);
481 memcpy(value, file_finder_info, file_rec_len);
482 res = file_rec_len;
483 } else {
484 res = -EOPNOTSUPP;
485 goto end_getxattr_finder_info;
486 }
487 } else
488 res = size ? -ERANGE : record_len;
489
490end_getxattr_finder_info:
491 if (size >= record_len)
492 hfs_find_exit(&fd);
493 return res;
494}
495
b4c1107c 496ssize_t __hfsplus_getxattr(struct inode *inode, const char *name,
127e5f5a
VD		 497 void *value, size_t size)
498{
127e5f5a
VD		 499 struct hfs_find_data fd;
500 hfsplus_attr_entry *entry;
501 __be32 xattr_record_type;
502 u32 record_type;
503 u16 record_length = 0;
504 ssize_t res = 0;
505
506 if ((!S_ISREG(inode->i_mode) &&
507 !S_ISDIR(inode->i_mode)) ||
508 HFSPLUS_IS_RSRC(inode))
509 return -EOPNOTSUPP;
510
127e5f5a 511 if (!strcmp_xattr_finder_info(name))
b4c1107c 512 return hfsplus_getxattr_finder_info(inode, value, size);
127e5f5a
VD		 513
514 if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
515 return -EOPNOTSUPP;
516
517 entry = hfsplus_alloc_attr_entry();
518 if (!entry) {
d6142673 519 pr_err("can't allocate xattr entry\n");
127e5f5a
VD		 520 return -ENOMEM;
521 }
522
523 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd);
524 if (res) {
d6142673 525 pr_err("can't init xattr find struct\n");
127e5f5a
VD		 526 goto failed_getxattr_init;
527 }
528
529 res = hfsplus_find_attr(inode->i_sb, inode->i_ino, name, &fd);
530 if (res) {
531 if (res == -ENOENT)
532 res = -ENODATA;
533 else
d6142673 534 pr_err("xattr searching failed\n");
127e5f5a
VD		 535 goto out;
536 }
537
538 hfs_bnode_read(fd.bnode, &xattr_record_type,
539 fd.entryoffset, sizeof(xattr_record_type));
540 record_type = be32_to_cpu(xattr_record_type);
541 if (record_type == HFSPLUS_ATTR_INLINE_DATA) {
542 record_length = hfs_bnode_read_u16(fd.bnode,
543 fd.entryoffset +
544 offsetof(struct hfsplus_attr_inline_data,
545 length));
546 if (record_length > HFSPLUS_MAX_INLINE_DATA_SIZE) {
d6142673 547 pr_err("invalid xattr record size\n");
127e5f5a
VD		 548 res = -EIO;
549 goto out;
550 }
551 } else if (record_type == HFSPLUS_ATTR_FORK_DATA ||
552 record_type == HFSPLUS_ATTR_EXTENTS) {
d6142673 553 pr_err("only inline data xattr are supported\n");
127e5f5a
VD		 554 res = -EOPNOTSUPP;
555 goto out;
556 } else {
d6142673 557 pr_err("invalid xattr record\n");
127e5f5a
VD		 558 res = -EIO;
559 goto out;
560 }
561
562 if (size) {
563 hfs_bnode_read(fd.bnode, entry, fd.entryoffset,
564 offsetof(struct hfsplus_attr_inline_data,
565 raw_bytes) + record_length);
566 }
567
568 if (size >= record_length) {
569 memcpy(value, entry->inline_data.raw_bytes, record_length);
570 res = record_length;
571 } else
572 res = size ? -ERANGE : record_length;
573
574out:
575 hfs_find_exit(&fd);
576
577failed_getxattr_init:
578 hfsplus_destroy_attr_entry(entry);
579 return res;
580}
581
a3cef4cd
FF		 582ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
583 void *value, size_t size,
584 const char *prefix, size_t prefixlen)
585{
586 int res;
587 char *xattr_name;
588
a3cef4cd
FF		 589 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
590 GFP_KERNEL);
591 if (!xattr_name)
592 return -ENOMEM;
593
594 strcpy(xattr_name, prefix);
595 strcpy(xattr_name + prefixlen, name);
596
9ec3a646 597 res = __hfsplus_getxattr(d_inode(dentry), xattr_name, value, size);
a3cef4cd
FF		 598 kfree(xattr_name);
599 return res;
600
601}
602
127e5f5a
VD		 603static inline int can_list(const char *xattr_name)
604{
605 if (!xattr_name)
606 return 0;
607
608 return strncmp(xattr_name, XATTR_TRUSTED_PREFIX,
609 XATTR_TRUSTED_PREFIX_LEN) ||
610 capable(CAP_SYS_ADMIN);
611}
612
613static ssize_t hfsplus_listxattr_finder_info(struct dentry *dentry,
614 char *buffer, size_t size)
615{
616 ssize_t res = 0;
2b0143b5 617 struct inode *inode = d_inode(dentry);
127e5f5a
VD		 618 struct hfs_find_data fd;
619 u16 entry_type;
620 u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)];
621 u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)];
622 unsigned long len, found_bit;
623 int xattr_name_len, symbols_count;
624
625 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
626 if (res) {
d6142673 627 pr_err("can't init xattr find struct\n");
127e5f5a
VD		 628 return res;
629 }
630
631 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
632 if (res)
633 goto end_listxattr_finder_info;
634
635 entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
636 if (entry_type == HFSPLUS_FOLDER) {
637 len = sizeof(struct DInfo) + sizeof(struct DXInfo);
638 hfs_bnode_read(fd.bnode, folder_finder_info,
639 fd.entryoffset +
640 offsetof(struct hfsplus_cat_folder, user_info),
641 len);
642 found_bit = find_first_bit((void *)folder_finder_info, len*8);
643 } else if (entry_type == HFSPLUS_FILE) {
644 len = sizeof(struct FInfo) + sizeof(struct FXInfo);
645 hfs_bnode_read(fd.bnode, file_finder_info,
646 fd.entryoffset +
647 offsetof(struct hfsplus_cat_file, user_info),
648 len);
649 found_bit = find_first_bit((void *)file_finder_info, len*8);
650 } else {
651 res = -EOPNOTSUPP;
652 goto end_listxattr_finder_info;
653 }
654
655 if (found_bit >= (len*8))
656 res = 0;
657 else {
658 symbols_count = sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME) - 1;
659 xattr_name_len =
660 name_len(HFSPLUS_XATTR_FINDER_INFO_NAME, symbols_count);
661 if (!buffer || !size) {
662 if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME))
663 res = xattr_name_len;
664 } else if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME)) {
665 if (size < xattr_name_len)
666 res = -ERANGE;
667 else {
668 res = copy_name(buffer,
669 HFSPLUS_XATTR_FINDER_INFO_NAME,
670 symbols_count);
671 }
672 }
673 }
674
675end_listxattr_finder_info:
676 hfs_find_exit(&fd);
677
678 return res;
679}
680
681ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
682{
683 ssize_t err;
684 ssize_t res = 0;
2b0143b5 685 struct inode *inode = d_inode(dentry);
127e5f5a
VD		 686 struct hfs_find_data fd;
687 u16 key_len = 0;
688 struct hfsplus_attr_key attr_key;
017f8da4 689 char *strbuf;
127e5f5a
VD		 690 int xattr_name_len;
691
692 if ((!S_ISREG(inode->i_mode) &&
693 !S_ISDIR(inode->i_mode)) ||
694 HFSPLUS_IS_RSRC(inode))
695 return -EOPNOTSUPP;
696
697 res = hfsplus_listxattr_finder_info(dentry, buffer, size);
698 if (res < 0)
699 return res;
700 else if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
701 return (res == 0) ? -EOPNOTSUPP : res;
702
703 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd);
704 if (err) {
d6142673 705 pr_err("can't init xattr find struct\n");
127e5f5a
VD		 706 return err;
707 }
708
017f8da4
HTL		 709 strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN +
710 XATTR_MAC_OSX_PREFIX_LEN + 1, GFP_KERNEL);
711 if (!strbuf) {
712 res = -ENOMEM;
713 goto out;
714 }
715
127e5f5a
VD		 716 err = hfsplus_find_attr(inode->i_sb, inode->i_ino, NULL, &fd);
717 if (err) {
718 if (err == -ENOENT) {
719 if (res == 0)
720 res = -ENODATA;
721 goto end_listxattr;
722 } else {
723 res = err;
724 goto end_listxattr;
725 }
726 }
727
728 for (;;) {
729 key_len = hfs_bnode_read_u16(fd.bnode, fd.keyoffset);
730 if (key_len == 0 || key_len > fd.tree->max_key_len) {
d6142673 731 pr_err("invalid xattr key length: %d\n", key_len);
127e5f5a
VD		 732 res = -EIO;
733 goto end_listxattr;
734 }
735
736 hfs_bnode_read(fd.bnode, &attr_key,
737 fd.keyoffset, key_len + sizeof(key_len));
738
739 if (be32_to_cpu(attr_key.cnid) != inode->i_ino)
740 goto end_listxattr;
741
017f8da4 742 xattr_name_len = NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN;
127e5f5a
VD		 743 if (hfsplus_uni2asc(inode->i_sb,
744 (const struct hfsplus_unistr *)&fd.key->attr.key_name,
745 strbuf, &xattr_name_len)) {
d6142673 746 pr_err("unicode conversion failed\n");
127e5f5a
VD		 747 res = -EIO;
748 goto end_listxattr;
749 }
750
751 if (!buffer || !size) {
752 if (can_list(strbuf))
753 res += name_len(strbuf, xattr_name_len);
754 } else if (can_list(strbuf)) {
755 if (size < (res + name_len(strbuf, xattr_name_len))) {
756 res = -ERANGE;
757 goto end_listxattr;
758 } else
759 res += copy_name(buffer + res,
760 strbuf, xattr_name_len);
761 }
762
763 if (hfs_brec_goto(&fd, 1))
764 goto end_listxattr;
765 }
766
767end_listxattr:
017f8da4
HTL		 768 kfree(strbuf);
769out:
127e5f5a
VD		 770 hfs_find_exit(&fd);
771 return res;
772}
773
b168fff7 774static int hfsplus_removexattr(struct inode *inode, const char *name)
127e5f5a
VD		 775{
776 int err = 0;
127e5f5a
VD		 777 struct hfs_find_data cat_fd;
778 u16 flags;
779 u16 cat_entry_type;
780 int is_xattr_acl_deleted = 0;
781 int is_all_xattrs_deleted = 0;
782
127e5f5a
VD		 783 if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
784 return -EOPNOTSUPP;
785
127e5f5a
VD		 786 if (!strcmp_xattr_finder_info(name))
787 return -EOPNOTSUPP;
788
789 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd);
790 if (err) {
d6142673 791 pr_err("can't init xattr find struct\n");
127e5f5a
VD		 792 return err;
793 }
794
795 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
796 if (err) {
d6142673 797 pr_err("catalog searching failed\n");
127e5f5a
VD		 798 goto end_removexattr;
799 }
800
801 err = hfsplus_delete_attr(inode, name);
802 if (err)
803 goto end_removexattr;
804
805 is_xattr_acl_deleted = !strcmp_xattr_acl(name);
806 is_all_xattrs_deleted = !hfsplus_attr_exists(inode, NULL);
807
808 if (!is_xattr_acl_deleted && !is_all_xattrs_deleted)
809 goto end_removexattr;
810
811 cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset);
812
813 if (cat_entry_type == HFSPLUS_FOLDER) {
814 flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset +
815 offsetof(struct hfsplus_cat_folder, flags));
816 if (is_xattr_acl_deleted)
817 flags &= ~HFSPLUS_ACL_EXISTS;
818 if (is_all_xattrs_deleted)
819 flags &= ~HFSPLUS_XATTR_EXISTS;
820 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
821 offsetof(struct hfsplus_cat_folder, flags),
822 flags);
823 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
824 } else if (cat_entry_type == HFSPLUS_FILE) {
825 flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset +
826 offsetof(struct hfsplus_cat_file, flags));
827 if (is_xattr_acl_deleted)
828 flags &= ~HFSPLUS_ACL_EXISTS;
829 if (is_all_xattrs_deleted)
830 flags &= ~HFSPLUS_XATTR_EXISTS;
831 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
832 offsetof(struct hfsplus_cat_file, flags),
833 flags);
834 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
835 } else {
d6142673 836 pr_err("invalid catalog entry type\n");
127e5f5a
VD		 837 err = -EIO;
838 goto end_removexattr;
839 }
840
841end_removexattr:
842 hfs_find_exit(&cat_fd);
843 return err;
844}
845
d9a82a04
AG		 846static int hfsplus_osx_getxattr(const struct xattr_handler *handler,
847 struct dentry *dentry, const char *name,
848 void *buffer, size_t size)
127e5f5a 849{
b168fff7
CH		 850 /*
851 * Don't allow retrieving properly prefixed attributes
852 * by prepending them with "osx."
853 */
854 if (is_known_namespace(name))
855 return -EOPNOTSUPP;
127e5f5a 856
db579e76
TH		 857 /*
858 * osx is the namespace we use to indicate an unprefixed
859 * attribute on the filesystem (like the ones that OS X
860 * creates), so we pass the name through unmodified (after
861 * ensuring it doesn't conflict with another namespace).
862 */
9ec3a646 863 return __hfsplus_getxattr(d_inode(dentry), name, buffer, size);
127e5f5a
VD		 864}
865
d9a82a04
AG		 866static int hfsplus_osx_setxattr(const struct xattr_handler *handler,
867 struct dentry *dentry, const char *name,
868 const void *buffer, size_t size, int flags)
127e5f5a 869{
b168fff7
CH		 870 /*
871 * Don't allow setting properly prefixed attributes
872 * by prepending them with "osx."
873 */
2796e4ce
CH		 874 if (is_known_namespace(name))
875 return -EOPNOTSUPP;
876
db579e76
TH		 877 /*
878 * osx is the namespace we use to indicate an unprefixed
879 * attribute on the filesystem (like the ones that OS X
880 * creates), so we pass the name through unmodified (after
881 * ensuring it doesn't conflict with another namespace).
882 */
9ec3a646 883 return __hfsplus_setxattr(d_inode(dentry), name, buffer, size, flags);
127e5f5a
VD		 884}
885
127e5f5a
VD		 886const struct xattr_handler hfsplus_xattr_osx_handler = {
887 .prefix = XATTR_MAC_OSX_PREFIX,
127e5f5a
VD		 888 .get = hfsplus_osx_getxattr,
889 .set = hfsplus_osx_setxattr,
890};
Linux kernel - Deliverables
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