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29b24f6c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
b17500a0 | 2 | /* |
b17500a0 | 3 | * Copyright (C) 2017-2018 HUAWEI, Inc. |
592e7cd0 | 4 | * https://www.huawei.com/ |
bb88e8da | 5 | * Copyright (C) 2021-2022, Alibaba Cloud |
b17500a0 GX |
6 | */ |
7 | #include <linux/security.h> | |
8 | #include "xattr.h" | |
9 | ||
399f36d8 JX |
10 | static inline erofs_blk_t erofs_xattr_blkaddr(struct super_block *sb, |
11 | unsigned int xattr_id) | |
12 | { | |
13 | return EROFS_SB(sb)->xattr_blkaddr + | |
14 | erofs_blknr(sb, xattr_id * sizeof(__u32)); | |
15 | } | |
16 | ||
17 | static inline unsigned int erofs_xattr_blkoff(struct super_block *sb, | |
18 | unsigned int xattr_id) | |
19 | { | |
20 | return erofs_blkoff(sb, xattr_id * sizeof(__u32)); | |
21 | } | |
22 | ||
b17500a0 GX |
23 | struct xattr_iter { |
24 | struct super_block *sb; | |
bb88e8da | 25 | struct erofs_buf buf; |
b17500a0 GX |
26 | void *kaddr; |
27 | ||
28 | erofs_blk_t blkaddr; | |
7dd68b14 | 29 | unsigned int ofs; |
b17500a0 GX |
30 | }; |
31 | ||
6020ffe7 | 32 | static int erofs_init_inode_xattrs(struct inode *inode) |
b17500a0 | 33 | { |
a5876e24 | 34 | struct erofs_inode *const vi = EROFS_I(inode); |
b17500a0 | 35 | struct xattr_iter it; |
7dd68b14 | 36 | unsigned int i; |
b17500a0 | 37 | struct erofs_xattr_ibody_header *ih; |
b780d3fc | 38 | struct super_block *sb = inode->i_sb; |
62dc4597 | 39 | int ret = 0; |
b17500a0 | 40 | |
62dc4597 | 41 | /* the most case is that xattrs of this inode are initialized. */ |
ce063129 GX |
42 | if (test_bit(EROFS_I_EA_INITED_BIT, &vi->flags)) { |
43 | /* | |
44 | * paired with smp_mb() at the end of the function to ensure | |
45 | * fields will only be observed after the bit is set. | |
46 | */ | |
47 | smp_mb(); | |
cadf1ccf | 48 | return 0; |
ce063129 | 49 | } |
b17500a0 | 50 | |
a5876e24 | 51 | if (wait_on_bit_lock(&vi->flags, EROFS_I_BL_XATTR_BIT, TASK_KILLABLE)) |
62dc4597 GX |
52 | return -ERESTARTSYS; |
53 | ||
54 | /* someone has initialized xattrs for us? */ | |
a5876e24 | 55 | if (test_bit(EROFS_I_EA_INITED_BIT, &vi->flags)) |
62dc4597 | 56 | goto out_unlock; |
7077fffc GX |
57 | |
58 | /* | |
59 | * bypass all xattr operations if ->xattr_isize is not greater than | |
60 | * sizeof(struct erofs_xattr_ibody_header), in detail: | |
61 | * 1) it is not enough to contain erofs_xattr_ibody_header then | |
62 | * ->xattr_isize should be 0 (it means no xattr); | |
63 | * 2) it is just to contain erofs_xattr_ibody_header, which is on-disk | |
64 | * undefined right now (maybe use later with some new sb feature). | |
65 | */ | |
66 | if (vi->xattr_isize == sizeof(struct erofs_xattr_ibody_header)) { | |
b780d3fc | 67 | erofs_err(sb, |
4f761fa2 GX |
68 | "xattr_isize %d of nid %llu is not supported yet", |
69 | vi->xattr_isize, vi->nid); | |
ff784a78 | 70 | ret = -EOPNOTSUPP; |
62dc4597 | 71 | goto out_unlock; |
7077fffc | 72 | } else if (vi->xattr_isize < sizeof(struct erofs_xattr_ibody_header)) { |
8d8a09b0 | 73 | if (vi->xattr_isize) { |
b780d3fc | 74 | erofs_err(sb, "bogus xattr ibody @ nid %llu", vi->nid); |
7077fffc | 75 | DBG_BUGON(1); |
a6b9b1d5 | 76 | ret = -EFSCORRUPTED; |
62dc4597 | 77 | goto out_unlock; /* xattr ondisk layout error */ |
7077fffc | 78 | } |
62dc4597 GX |
79 | ret = -ENOATTR; |
80 | goto out_unlock; | |
7077fffc | 81 | } |
b17500a0 | 82 | |
bb88e8da | 83 | it.buf = __EROFS_BUF_INITIALIZER; |
3acea5fc JX |
84 | it.blkaddr = erofs_blknr(sb, erofs_iloc(inode) + vi->inode_isize); |
85 | it.ofs = erofs_blkoff(sb, erofs_iloc(inode) + vi->inode_isize); | |
b17500a0 | 86 | |
bb88e8da GX |
87 | /* read in shared xattr array (non-atomic, see kmalloc below) */ |
88 | it.kaddr = erofs_read_metabuf(&it.buf, sb, it.blkaddr, EROFS_KMAP); | |
89 | if (IS_ERR(it.kaddr)) { | |
90 | ret = PTR_ERR(it.kaddr); | |
62dc4597 GX |
91 | goto out_unlock; |
92 | } | |
b17500a0 | 93 | |
b17500a0 | 94 | ih = (struct erofs_xattr_ibody_header *)(it.kaddr + it.ofs); |
b17500a0 | 95 | vi->xattr_shared_count = ih->h_shared_count; |
cadf1ccf GX |
96 | vi->xattr_shared_xattrs = kmalloc_array(vi->xattr_shared_count, |
97 | sizeof(uint), GFP_KERNEL); | |
561fb35a | 98 | if (!vi->xattr_shared_xattrs) { |
bb88e8da | 99 | erofs_put_metabuf(&it.buf); |
62dc4597 GX |
100 | ret = -ENOMEM; |
101 | goto out_unlock; | |
cadf1ccf | 102 | } |
b17500a0 GX |
103 | |
104 | /* let's skip ibody header */ | |
105 | it.ofs += sizeof(struct erofs_xattr_ibody_header); | |
106 | ||
107 | for (i = 0; i < vi->xattr_shared_count; ++i) { | |
3acea5fc | 108 | if (it.ofs >= sb->s_blocksize) { |
b17500a0 | 109 | /* cannot be unaligned */ |
3acea5fc | 110 | DBG_BUGON(it.ofs != sb->s_blocksize); |
b17500a0 | 111 | |
bb88e8da GX |
112 | it.kaddr = erofs_read_metabuf(&it.buf, sb, ++it.blkaddr, |
113 | EROFS_KMAP); | |
114 | if (IS_ERR(it.kaddr)) { | |
3b1b5291 SY |
115 | kfree(vi->xattr_shared_xattrs); |
116 | vi->xattr_shared_xattrs = NULL; | |
bb88e8da | 117 | ret = PTR_ERR(it.kaddr); |
62dc4597 | 118 | goto out_unlock; |
3b1b5291 | 119 | } |
b17500a0 GX |
120 | it.ofs = 0; |
121 | } | |
122 | vi->xattr_shared_xattrs[i] = | |
123 | le32_to_cpu(*(__le32 *)(it.kaddr + it.ofs)); | |
124 | it.ofs += sizeof(__le32); | |
125 | } | |
bb88e8da | 126 | erofs_put_metabuf(&it.buf); |
b17500a0 | 127 | |
ce063129 GX |
128 | /* paired with smp_mb() at the beginning of the function. */ |
129 | smp_mb(); | |
a5876e24 | 130 | set_bit(EROFS_I_EA_INITED_BIT, &vi->flags); |
62dc4597 GX |
131 | |
132 | out_unlock: | |
a5876e24 | 133 | clear_and_wake_up_bit(EROFS_I_BL_XATTR_BIT, &vi->flags); |
62dc4597 | 134 | return ret; |
b17500a0 GX |
135 | } |
136 | ||
bdf30cef GX |
137 | /* |
138 | * the general idea for these return values is | |
139 | * if 0 is returned, go on processing the current xattr; | |
140 | * 1 (> 0) is returned, skip this round to process the next xattr; | |
141 | * -err (< 0) is returned, an error (maybe ENOXATTR) occurred | |
142 | * and need to be handled | |
143 | */ | |
b17500a0 | 144 | struct xattr_iter_handlers { |
4b03f3f4 SY |
145 | int (*entry)(struct xattr_iter *_it, struct erofs_xattr_entry *entry); |
146 | int (*name)(struct xattr_iter *_it, unsigned int processed, char *buf, | |
147 | unsigned int len); | |
148 | int (*alloc_buffer)(struct xattr_iter *_it, unsigned int value_sz); | |
149 | void (*value)(struct xattr_iter *_it, unsigned int processed, char *buf, | |
150 | unsigned int len); | |
b17500a0 GX |
151 | }; |
152 | ||
cadf1ccf | 153 | static inline int xattr_iter_fixup(struct xattr_iter *it) |
b17500a0 | 154 | { |
3acea5fc | 155 | if (it->ofs < it->sb->s_blocksize) |
cadf1ccf GX |
156 | return 0; |
157 | ||
3acea5fc | 158 | it->blkaddr += erofs_blknr(it->sb, it->ofs); |
bb88e8da | 159 | it->kaddr = erofs_read_metabuf(&it->buf, it->sb, it->blkaddr, |
927e5010 | 160 | EROFS_KMAP); |
bb88e8da GX |
161 | if (IS_ERR(it->kaddr)) |
162 | return PTR_ERR(it->kaddr); | |
3acea5fc | 163 | it->ofs = erofs_blkoff(it->sb, it->ofs); |
cadf1ccf | 164 | return 0; |
b17500a0 GX |
165 | } |
166 | ||
167 | static int inline_xattr_iter_begin(struct xattr_iter *it, | |
447a3621 | 168 | struct inode *inode) |
b17500a0 | 169 | { |
a5876e24 | 170 | struct erofs_inode *const vi = EROFS_I(inode); |
7dd68b14 | 171 | unsigned int xattr_header_sz, inline_xattr_ofs; |
b17500a0 | 172 | |
399f36d8 JX |
173 | xattr_header_sz = sizeof(struct erofs_xattr_ibody_header) + |
174 | sizeof(u32) * vi->xattr_shared_count; | |
8d8a09b0 | 175 | if (xattr_header_sz >= vi->xattr_isize) { |
9ddc7004 | 176 | DBG_BUGON(xattr_header_sz > vi->xattr_isize); |
b17500a0 GX |
177 | return -ENOATTR; |
178 | } | |
179 | ||
180 | inline_xattr_ofs = vi->inode_isize + xattr_header_sz; | |
181 | ||
3acea5fc JX |
182 | it->blkaddr = erofs_blknr(it->sb, erofs_iloc(inode) + inline_xattr_ofs); |
183 | it->ofs = erofs_blkoff(it->sb, erofs_iloc(inode) + inline_xattr_ofs); | |
bb88e8da | 184 | it->kaddr = erofs_read_metabuf(&it->buf, inode->i_sb, it->blkaddr, |
927e5010 | 185 | EROFS_KMAP); |
bb88e8da GX |
186 | if (IS_ERR(it->kaddr)) |
187 | return PTR_ERR(it->kaddr); | |
b17500a0 GX |
188 | return vi->xattr_isize - xattr_header_sz; |
189 | } | |
190 | ||
bdf30cef GX |
191 | /* |
192 | * Regardless of success or failure, `xattr_foreach' will end up with | |
193 | * `ofs' pointing to the next xattr item rather than an arbitrary position. | |
194 | */ | |
b17500a0 | 195 | static int xattr_foreach(struct xattr_iter *it, |
447a3621 JM |
196 | const struct xattr_iter_handlers *op, |
197 | unsigned int *tlimit) | |
b17500a0 GX |
198 | { |
199 | struct erofs_xattr_entry entry; | |
7dd68b14 | 200 | unsigned int value_sz, processed, slice; |
b17500a0 GX |
201 | int err; |
202 | ||
203 | /* 0. fixup blkaddr, ofs, ipage */ | |
cadf1ccf GX |
204 | err = xattr_iter_fixup(it); |
205 | if (err) | |
206 | return err; | |
b17500a0 GX |
207 | |
208 | /* | |
209 | * 1. read xattr entry to the memory, | |
210 | * since we do EROFS_XATTR_ALIGN | |
211 | * therefore entry should be in the page | |
212 | */ | |
213 | entry = *(struct erofs_xattr_entry *)(it->kaddr + it->ofs); | |
561fb35a | 214 | if (tlimit) { |
b6796abd | 215 | unsigned int entry_sz = erofs_xattr_entry_size(&entry); |
b17500a0 | 216 | |
9ddc7004 | 217 | /* xattr on-disk corruption: xattr entry beyond xattr_isize */ |
8d8a09b0 | 218 | if (*tlimit < entry_sz) { |
9ddc7004 | 219 | DBG_BUGON(1); |
a6b9b1d5 | 220 | return -EFSCORRUPTED; |
9ddc7004 | 221 | } |
b17500a0 GX |
222 | *tlimit -= entry_sz; |
223 | } | |
224 | ||
225 | it->ofs += sizeof(struct erofs_xattr_entry); | |
226 | value_sz = le16_to_cpu(entry.e_value_size); | |
227 | ||
228 | /* handle entry */ | |
229 | err = op->entry(it, &entry); | |
230 | if (err) { | |
231 | it->ofs += entry.e_name_len + value_sz; | |
232 | goto out; | |
233 | } | |
234 | ||
235 | /* 2. handle xattr name (ofs will finally be at the end of name) */ | |
236 | processed = 0; | |
237 | ||
238 | while (processed < entry.e_name_len) { | |
3acea5fc JX |
239 | if (it->ofs >= it->sb->s_blocksize) { |
240 | DBG_BUGON(it->ofs > it->sb->s_blocksize); | |
b17500a0 | 241 | |
cadf1ccf GX |
242 | err = xattr_iter_fixup(it); |
243 | if (err) | |
244 | goto out; | |
b17500a0 GX |
245 | it->ofs = 0; |
246 | } | |
247 | ||
3acea5fc | 248 | slice = min_t(unsigned int, it->sb->s_blocksize - it->ofs, |
7dd68b14 | 249 | entry.e_name_len - processed); |
b17500a0 GX |
250 | |
251 | /* handle name */ | |
252 | err = op->name(it, processed, it->kaddr + it->ofs, slice); | |
253 | if (err) { | |
254 | it->ofs += entry.e_name_len - processed + value_sz; | |
255 | goto out; | |
256 | } | |
257 | ||
258 | it->ofs += slice; | |
259 | processed += slice; | |
260 | } | |
261 | ||
262 | /* 3. handle xattr value */ | |
263 | processed = 0; | |
264 | ||
561fb35a | 265 | if (op->alloc_buffer) { |
b17500a0 GX |
266 | err = op->alloc_buffer(it, value_sz); |
267 | if (err) { | |
268 | it->ofs += value_sz; | |
269 | goto out; | |
270 | } | |
271 | } | |
272 | ||
273 | while (processed < value_sz) { | |
3acea5fc JX |
274 | if (it->ofs >= it->sb->s_blocksize) { |
275 | DBG_BUGON(it->ofs > it->sb->s_blocksize); | |
cadf1ccf GX |
276 | |
277 | err = xattr_iter_fixup(it); | |
278 | if (err) | |
279 | goto out; | |
b17500a0 GX |
280 | it->ofs = 0; |
281 | } | |
282 | ||
3acea5fc | 283 | slice = min_t(unsigned int, it->sb->s_blocksize - it->ofs, |
7dd68b14 | 284 | value_sz - processed); |
b17500a0 GX |
285 | op->value(it, processed, it->kaddr + it->ofs, slice); |
286 | it->ofs += slice; | |
287 | processed += slice; | |
288 | } | |
289 | ||
290 | out: | |
bdf30cef | 291 | /* xattrs should be 4-byte aligned (on-disk constraint) */ |
b17500a0 | 292 | it->ofs = EROFS_XATTR_ALIGN(it->ofs); |
6614f765 | 293 | return err < 0 ? err : 0; |
b17500a0 GX |
294 | } |
295 | ||
296 | struct getxattr_iter { | |
297 | struct xattr_iter it; | |
298 | ||
299 | char *buffer; | |
82bc1ef4 | 300 | int buffer_size, index, infix_len; |
b17500a0 GX |
301 | struct qstr name; |
302 | }; | |
303 | ||
82bc1ef4 JX |
304 | static int erofs_xattr_long_entrymatch(struct getxattr_iter *it, |
305 | struct erofs_xattr_entry *entry) | |
306 | { | |
307 | struct erofs_sb_info *sbi = EROFS_SB(it->it.sb); | |
308 | struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes + | |
309 | (entry->e_name_index & EROFS_XATTR_LONG_PREFIX_MASK); | |
310 | ||
311 | if (pf >= sbi->xattr_prefixes + sbi->xattr_prefix_count) | |
312 | return -ENOATTR; | |
313 | ||
314 | if (it->index != pf->prefix->base_index || | |
315 | it->name.len != entry->e_name_len + pf->infix_len) | |
316 | return -ENOATTR; | |
317 | ||
318 | if (memcmp(it->name.name, pf->prefix->infix, pf->infix_len)) | |
319 | return -ENOATTR; | |
320 | ||
321 | it->infix_len = pf->infix_len; | |
322 | return 0; | |
323 | } | |
324 | ||
b17500a0 | 325 | static int xattr_entrymatch(struct xattr_iter *_it, |
447a3621 | 326 | struct erofs_xattr_entry *entry) |
b17500a0 GX |
327 | { |
328 | struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it); | |
329 | ||
82bc1ef4 JX |
330 | /* should also match the infix for long name prefixes */ |
331 | if (entry->e_name_index & EROFS_XATTR_LONG_PREFIX) | |
332 | return erofs_xattr_long_entrymatch(it, entry); | |
333 | ||
334 | if (it->index != entry->e_name_index || | |
335 | it->name.len != entry->e_name_len) | |
336 | return -ENOATTR; | |
337 | it->infix_len = 0; | |
338 | return 0; | |
b17500a0 GX |
339 | } |
340 | ||
341 | static int xattr_namematch(struct xattr_iter *_it, | |
447a3621 | 342 | unsigned int processed, char *buf, unsigned int len) |
b17500a0 GX |
343 | { |
344 | struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it); | |
345 | ||
82bc1ef4 JX |
346 | if (memcmp(buf, it->name.name + it->infix_len + processed, len)) |
347 | return -ENOATTR; | |
348 | return 0; | |
b17500a0 GX |
349 | } |
350 | ||
351 | static int xattr_checkbuffer(struct xattr_iter *_it, | |
447a3621 | 352 | unsigned int value_sz) |
b17500a0 GX |
353 | { |
354 | struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it); | |
355 | int err = it->buffer_size < value_sz ? -ERANGE : 0; | |
356 | ||
357 | it->buffer_size = value_sz; | |
561fb35a | 358 | return !it->buffer ? 1 : err; |
b17500a0 GX |
359 | } |
360 | ||
361 | static void xattr_copyvalue(struct xattr_iter *_it, | |
447a3621 JM |
362 | unsigned int processed, |
363 | char *buf, unsigned int len) | |
b17500a0 GX |
364 | { |
365 | struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it); | |
366 | ||
367 | memcpy(it->buffer + processed, buf, len); | |
368 | } | |
369 | ||
cadf1ccf | 370 | static const struct xattr_iter_handlers find_xattr_handlers = { |
b17500a0 GX |
371 | .entry = xattr_entrymatch, |
372 | .name = xattr_namematch, | |
373 | .alloc_buffer = xattr_checkbuffer, | |
374 | .value = xattr_copyvalue | |
375 | }; | |
376 | ||
377 | static int inline_getxattr(struct inode *inode, struct getxattr_iter *it) | |
378 | { | |
379 | int ret; | |
7dd68b14 | 380 | unsigned int remaining; |
b17500a0 GX |
381 | |
382 | ret = inline_xattr_iter_begin(&it->it, inode); | |
383 | if (ret < 0) | |
384 | return ret; | |
385 | ||
386 | remaining = ret; | |
387 | while (remaining) { | |
2bc75964 | 388 | ret = xattr_foreach(&it->it, &find_xattr_handlers, &remaining); |
6614f765 | 389 | if (ret != -ENOATTR) |
cadf1ccf | 390 | break; |
b17500a0 | 391 | } |
6614f765 | 392 | return ret ? ret : it->buffer_size; |
b17500a0 GX |
393 | } |
394 | ||
395 | static int shared_getxattr(struct inode *inode, struct getxattr_iter *it) | |
396 | { | |
a5876e24 | 397 | struct erofs_inode *const vi = EROFS_I(inode); |
399f36d8 JX |
398 | struct super_block *const sb = it->it.sb; |
399 | unsigned int i, xsid; | |
b17500a0 GX |
400 | int ret = -ENOATTR; |
401 | ||
402 | for (i = 0; i < vi->xattr_shared_count; ++i) { | |
399f36d8 JX |
403 | xsid = vi->xattr_shared_xattrs[i]; |
404 | it->it.blkaddr = erofs_xattr_blkaddr(sb, xsid); | |
405 | it->it.ofs = erofs_xattr_blkoff(sb, xsid); | |
406 | it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb, | |
407 | it->it.blkaddr, EROFS_KMAP); | |
bb88e8da GX |
408 | if (IS_ERR(it->it.kaddr)) |
409 | return PTR_ERR(it->it.kaddr); | |
b17500a0 | 410 | |
2bc75964 | 411 | ret = xattr_foreach(&it->it, &find_xattr_handlers, NULL); |
6614f765 | 412 | if (ret != -ENOATTR) |
cadf1ccf | 413 | break; |
b17500a0 | 414 | } |
6614f765 | 415 | return ret ? ret : it->buffer_size; |
b17500a0 GX |
416 | } |
417 | ||
418 | static bool erofs_xattr_user_list(struct dentry *dentry) | |
419 | { | |
e6242465 | 420 | return test_opt(&EROFS_SB(dentry->d_sb)->opt, XATTR_USER); |
b17500a0 GX |
421 | } |
422 | ||
423 | static bool erofs_xattr_trusted_list(struct dentry *dentry) | |
424 | { | |
425 | return capable(CAP_SYS_ADMIN); | |
426 | } | |
427 | ||
428 | int erofs_getxattr(struct inode *inode, int index, | |
447a3621 JM |
429 | const char *name, |
430 | void *buffer, size_t buffer_size) | |
b17500a0 GX |
431 | { |
432 | int ret; | |
433 | struct getxattr_iter it; | |
434 | ||
8d8a09b0 | 435 | if (!name) |
b17500a0 GX |
436 | return -EINVAL; |
437 | ||
6020ffe7 | 438 | ret = erofs_init_inode_xattrs(inode); |
cadf1ccf GX |
439 | if (ret) |
440 | return ret; | |
b17500a0 GX |
441 | |
442 | it.index = index; | |
b17500a0 GX |
443 | it.name.len = strlen(name); |
444 | if (it.name.len > EROFS_NAME_LEN) | |
445 | return -ERANGE; | |
bb88e8da GX |
446 | |
447 | it.it.buf = __EROFS_BUF_INITIALIZER; | |
b17500a0 GX |
448 | it.name.name = name; |
449 | ||
450 | it.buffer = buffer; | |
451 | it.buffer_size = buffer_size; | |
452 | ||
453 | it.it.sb = inode->i_sb; | |
454 | ret = inline_getxattr(inode, &it); | |
455 | if (ret == -ENOATTR) | |
456 | ret = shared_getxattr(inode, &it); | |
bb88e8da | 457 | erofs_put_metabuf(&it.it.buf); |
b17500a0 GX |
458 | return ret; |
459 | } | |
460 | ||
461 | static int erofs_xattr_generic_get(const struct xattr_handler *handler, | |
447a3621 JM |
462 | struct dentry *unused, struct inode *inode, |
463 | const char *name, void *buffer, size_t size) | |
b17500a0 | 464 | { |
b05f30bc JX |
465 | if (handler->flags == EROFS_XATTR_INDEX_USER && |
466 | !test_opt(&EROFS_I_SB(inode)->opt, XATTR_USER)) | |
467 | return -EOPNOTSUPP; | |
b17500a0 | 468 | |
b17500a0 GX |
469 | return erofs_getxattr(inode, handler->flags, name, buffer, size); |
470 | } | |
471 | ||
472 | const struct xattr_handler erofs_xattr_user_handler = { | |
473 | .prefix = XATTR_USER_PREFIX, | |
474 | .flags = EROFS_XATTR_INDEX_USER, | |
475 | .list = erofs_xattr_user_list, | |
476 | .get = erofs_xattr_generic_get, | |
477 | }; | |
478 | ||
479 | const struct xattr_handler erofs_xattr_trusted_handler = { | |
480 | .prefix = XATTR_TRUSTED_PREFIX, | |
481 | .flags = EROFS_XATTR_INDEX_TRUSTED, | |
482 | .list = erofs_xattr_trusted_list, | |
483 | .get = erofs_xattr_generic_get, | |
484 | }; | |
485 | ||
486 | #ifdef CONFIG_EROFS_FS_SECURITY | |
487 | const struct xattr_handler __maybe_unused erofs_xattr_security_handler = { | |
488 | .prefix = XATTR_SECURITY_PREFIX, | |
489 | .flags = EROFS_XATTR_INDEX_SECURITY, | |
490 | .get = erofs_xattr_generic_get, | |
491 | }; | |
492 | #endif | |
493 | ||
b17500a0 GX |
494 | const struct xattr_handler *erofs_xattr_handlers[] = { |
495 | &erofs_xattr_user_handler, | |
b17500a0 GX |
496 | &erofs_xattr_trusted_handler, |
497 | #ifdef CONFIG_EROFS_FS_SECURITY | |
498 | &erofs_xattr_security_handler, | |
499 | #endif | |
500 | NULL, | |
501 | }; | |
b17500a0 GX |
502 | |
503 | struct listxattr_iter { | |
504 | struct xattr_iter it; | |
505 | ||
506 | struct dentry *dentry; | |
507 | char *buffer; | |
508 | int buffer_size, buffer_ofs; | |
509 | }; | |
510 | ||
511 | static int xattr_entrylist(struct xattr_iter *_it, | |
447a3621 | 512 | struct erofs_xattr_entry *entry) |
b17500a0 GX |
513 | { |
514 | struct listxattr_iter *it = | |
515 | container_of(_it, struct listxattr_iter, it); | |
82bc1ef4 JX |
516 | unsigned int base_index = entry->e_name_index; |
517 | unsigned int prefix_len, infix_len = 0; | |
518 | const char *prefix, *infix = NULL; | |
82bc1ef4 JX |
519 | |
520 | if (entry->e_name_index & EROFS_XATTR_LONG_PREFIX) { | |
521 | struct erofs_sb_info *sbi = EROFS_SB(_it->sb); | |
522 | struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes + | |
523 | (entry->e_name_index & EROFS_XATTR_LONG_PREFIX_MASK); | |
524 | ||
525 | if (pf >= sbi->xattr_prefixes + sbi->xattr_prefix_count) | |
526 | return 1; | |
527 | infix = pf->prefix->infix; | |
528 | infix_len = pf->infix_len; | |
529 | base_index = pf->prefix->base_index; | |
530 | } | |
b17500a0 | 531 | |
61d325dc | 532 | prefix = erofs_xattr_prefix(base_index, it->dentry); |
a5488f29 | 533 | if (!prefix) |
b17500a0 | 534 | return 1; |
b17500a0 GX |
535 | prefix_len = strlen(prefix); |
536 | ||
561fb35a | 537 | if (!it->buffer) { |
82bc1ef4 JX |
538 | it->buffer_ofs += prefix_len + infix_len + |
539 | entry->e_name_len + 1; | |
b17500a0 GX |
540 | return 1; |
541 | } | |
542 | ||
82bc1ef4 | 543 | if (it->buffer_ofs + prefix_len + infix_len + |
b17500a0 GX |
544 | + entry->e_name_len + 1 > it->buffer_size) |
545 | return -ERANGE; | |
546 | ||
547 | memcpy(it->buffer + it->buffer_ofs, prefix, prefix_len); | |
82bc1ef4 JX |
548 | memcpy(it->buffer + it->buffer_ofs + prefix_len, infix, infix_len); |
549 | it->buffer_ofs += prefix_len + infix_len; | |
b17500a0 GX |
550 | return 0; |
551 | } | |
552 | ||
553 | static int xattr_namelist(struct xattr_iter *_it, | |
447a3621 | 554 | unsigned int processed, char *buf, unsigned int len) |
b17500a0 GX |
555 | { |
556 | struct listxattr_iter *it = | |
557 | container_of(_it, struct listxattr_iter, it); | |
558 | ||
559 | memcpy(it->buffer + it->buffer_ofs, buf, len); | |
560 | it->buffer_ofs += len; | |
561 | return 0; | |
562 | } | |
563 | ||
564 | static int xattr_skipvalue(struct xattr_iter *_it, | |
447a3621 | 565 | unsigned int value_sz) |
b17500a0 GX |
566 | { |
567 | struct listxattr_iter *it = | |
568 | container_of(_it, struct listxattr_iter, it); | |
569 | ||
570 | it->buffer[it->buffer_ofs++] = '\0'; | |
571 | return 1; | |
572 | } | |
573 | ||
cadf1ccf | 574 | static const struct xattr_iter_handlers list_xattr_handlers = { |
b17500a0 GX |
575 | .entry = xattr_entrylist, |
576 | .name = xattr_namelist, | |
577 | .alloc_buffer = xattr_skipvalue, | |
578 | .value = NULL | |
579 | }; | |
580 | ||
581 | static int inline_listxattr(struct listxattr_iter *it) | |
582 | { | |
583 | int ret; | |
7dd68b14 | 584 | unsigned int remaining; |
b17500a0 GX |
585 | |
586 | ret = inline_xattr_iter_begin(&it->it, d_inode(it->dentry)); | |
587 | if (ret < 0) | |
588 | return ret; | |
589 | ||
590 | remaining = ret; | |
591 | while (remaining) { | |
2bc75964 | 592 | ret = xattr_foreach(&it->it, &list_xattr_handlers, &remaining); |
6614f765 | 593 | if (ret) |
b17500a0 GX |
594 | break; |
595 | } | |
6614f765 | 596 | return ret ? ret : it->buffer_ofs; |
b17500a0 GX |
597 | } |
598 | ||
599 | static int shared_listxattr(struct listxattr_iter *it) | |
600 | { | |
601 | struct inode *const inode = d_inode(it->dentry); | |
a5876e24 | 602 | struct erofs_inode *const vi = EROFS_I(inode); |
399f36d8 JX |
603 | struct super_block *const sb = it->it.sb; |
604 | unsigned int i, xsid; | |
b17500a0 GX |
605 | int ret = 0; |
606 | ||
607 | for (i = 0; i < vi->xattr_shared_count; ++i) { | |
399f36d8 JX |
608 | xsid = vi->xattr_shared_xattrs[i]; |
609 | it->it.blkaddr = erofs_xattr_blkaddr(sb, xsid); | |
610 | it->it.ofs = erofs_xattr_blkoff(sb, xsid); | |
611 | it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb, | |
612 | it->it.blkaddr, EROFS_KMAP); | |
bb88e8da GX |
613 | if (IS_ERR(it->it.kaddr)) |
614 | return PTR_ERR(it->it.kaddr); | |
b17500a0 | 615 | |
2bc75964 | 616 | ret = xattr_foreach(&it->it, &list_xattr_handlers, NULL); |
6614f765 | 617 | if (ret) |
b17500a0 GX |
618 | break; |
619 | } | |
6614f765 | 620 | return ret ? ret : it->buffer_ofs; |
b17500a0 GX |
621 | } |
622 | ||
623 | ssize_t erofs_listxattr(struct dentry *dentry, | |
447a3621 | 624 | char *buffer, size_t buffer_size) |
b17500a0 GX |
625 | { |
626 | int ret; | |
627 | struct listxattr_iter it; | |
628 | ||
6020ffe7 | 629 | ret = erofs_init_inode_xattrs(d_inode(dentry)); |
926d1650 GX |
630 | if (ret == -ENOATTR) |
631 | return 0; | |
cadf1ccf GX |
632 | if (ret) |
633 | return ret; | |
b17500a0 | 634 | |
bb88e8da | 635 | it.it.buf = __EROFS_BUF_INITIALIZER; |
b17500a0 GX |
636 | it.dentry = dentry; |
637 | it.buffer = buffer; | |
638 | it.buffer_size = buffer_size; | |
639 | it.buffer_ofs = 0; | |
640 | ||
641 | it.it.sb = dentry->d_sb; | |
642 | ||
643 | ret = inline_listxattr(&it); | |
bb88e8da GX |
644 | if (ret >= 0 || ret == -ENOATTR) |
645 | ret = shared_listxattr(&it); | |
646 | erofs_put_metabuf(&it.it.buf); | |
647 | return ret; | |
b17500a0 GX |
648 | } |
649 | ||
9e382914 JX |
650 | void erofs_xattr_prefixes_cleanup(struct super_block *sb) |
651 | { | |
652 | struct erofs_sb_info *sbi = EROFS_SB(sb); | |
653 | int i; | |
654 | ||
655 | if (sbi->xattr_prefixes) { | |
656 | for (i = 0; i < sbi->xattr_prefix_count; i++) | |
657 | kfree(sbi->xattr_prefixes[i].prefix); | |
658 | kfree(sbi->xattr_prefixes); | |
659 | sbi->xattr_prefixes = NULL; | |
660 | } | |
661 | } | |
662 | ||
663 | int erofs_xattr_prefixes_init(struct super_block *sb) | |
664 | { | |
665 | struct erofs_sb_info *sbi = EROFS_SB(sb); | |
666 | struct erofs_buf buf = __EROFS_BUF_INITIALIZER; | |
667 | erofs_off_t pos = (erofs_off_t)sbi->xattr_prefix_start << 2; | |
668 | struct erofs_xattr_prefix_item *pfs; | |
669 | int ret = 0, i, len; | |
670 | ||
671 | if (!sbi->xattr_prefix_count) | |
672 | return 0; | |
673 | ||
674 | pfs = kzalloc(sbi->xattr_prefix_count * sizeof(*pfs), GFP_KERNEL); | |
675 | if (!pfs) | |
676 | return -ENOMEM; | |
677 | ||
678 | if (erofs_sb_has_fragments(sbi)) | |
679 | buf.inode = sbi->packed_inode; | |
680 | else | |
681 | erofs_init_metabuf(&buf, sb); | |
682 | ||
683 | for (i = 0; i < sbi->xattr_prefix_count; i++) { | |
684 | void *ptr = erofs_read_metadata(sb, &buf, &pos, &len); | |
685 | ||
686 | if (IS_ERR(ptr)) { | |
687 | ret = PTR_ERR(ptr); | |
688 | break; | |
689 | } else if (len < sizeof(*pfs->prefix) || | |
690 | len > EROFS_NAME_LEN + sizeof(*pfs->prefix)) { | |
691 | kfree(ptr); | |
692 | ret = -EFSCORRUPTED; | |
693 | break; | |
694 | } | |
695 | pfs[i].prefix = ptr; | |
696 | pfs[i].infix_len = len - sizeof(struct erofs_xattr_long_prefix); | |
697 | } | |
698 | ||
699 | erofs_put_metabuf(&buf); | |
700 | sbi->xattr_prefixes = pfs; | |
701 | if (ret) | |
702 | erofs_xattr_prefixes_cleanup(sb); | |
703 | return ret; | |
704 | } | |
705 | ||
516c115c | 706 | #ifdef CONFIG_EROFS_FS_POSIX_ACL |
0cad6246 | 707 | struct posix_acl *erofs_get_acl(struct inode *inode, int type, bool rcu) |
516c115c GX |
708 | { |
709 | struct posix_acl *acl; | |
710 | int prefix, rc; | |
711 | char *value = NULL; | |
712 | ||
0cad6246 MS |
713 | if (rcu) |
714 | return ERR_PTR(-ECHILD); | |
715 | ||
516c115c GX |
716 | switch (type) { |
717 | case ACL_TYPE_ACCESS: | |
718 | prefix = EROFS_XATTR_INDEX_POSIX_ACL_ACCESS; | |
719 | break; | |
720 | case ACL_TYPE_DEFAULT: | |
721 | prefix = EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT; | |
722 | break; | |
723 | default: | |
724 | return ERR_PTR(-EINVAL); | |
725 | } | |
726 | ||
727 | rc = erofs_getxattr(inode, prefix, "", NULL, 0); | |
728 | if (rc > 0) { | |
729 | value = kmalloc(rc, GFP_KERNEL); | |
730 | if (!value) | |
731 | return ERR_PTR(-ENOMEM); | |
732 | rc = erofs_getxattr(inode, prefix, "", value, rc); | |
733 | } | |
734 | ||
735 | if (rc == -ENOATTR) | |
736 | acl = NULL; | |
737 | else if (rc < 0) | |
738 | acl = ERR_PTR(rc); | |
739 | else | |
740 | acl = posix_acl_from_xattr(&init_user_ns, value, rc); | |
741 | kfree(value); | |
742 | return acl; | |
743 | } | |
744 | #endif |