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6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_trans_resv.h"
11#include "xfs_mount.h"
12#include "xfs_log_format.h"
13#include "xfs_inode.h"
14#include "xfs_da_format.h"
15#include "xfs_da_btree.h"
16#include "xfs_attr.h"
17#include "xfs_attr_leaf.h"
18#include "scrub/scrub.h"
19#include "scrub/common.h"
20#include "scrub/dabtree.h"
21#include "scrub/attr.h"
22
23
24
25
26
27
28int
29xchk_setup_xattr_buf(
30 struct xfs_scrub *sc,
31 size_t value_size,
32 xfs_km_flags_t flags)
33{
34 size_t sz;
35 struct xchk_xattr_buf *ab = sc->buf;
36
37
38
39
40
41
42 sz = 3 * sizeof(long) * BITS_TO_LONGS(sc->mp->m_attr_geo->blksize);
43 sz = max_t(size_t, sz, value_size);
44
45
46
47
48
49 if (ab) {
50 if (sz <= ab->sz)
51 return 0;
52 kmem_free(ab);
53 sc->buf = NULL;
54 }
55
56
57
58
59
60 ab = kmem_alloc_large(sizeof(*ab) + sz, flags);
61 if (!ab)
62 return -ENOMEM;
63
64 ab->sz = sz;
65 sc->buf = ab;
66 return 0;
67}
68
69
70int
71xchk_setup_xattr(
72 struct xfs_scrub *sc,
73 struct xfs_inode *ip)
74{
75 int error;
76
77
78
79
80
81
82 if (sc->flags & XCHK_TRY_HARDER) {
83 error = xchk_setup_xattr_buf(sc, XATTR_SIZE_MAX, KM_SLEEP);
84 if (error)
85 return error;
86 }
87
88 return xchk_setup_inode_contents(sc, ip, 0);
89}
90
91
92
93struct xchk_xattr {
94 struct xfs_attr_list_context context;
95 struct xfs_scrub *sc;
96};
97
98
99
100
101
102
103
104
105
106static void
107xchk_xattr_listent(
108 struct xfs_attr_list_context *context,
109 int flags,
110 unsigned char *name,
111 int namelen,
112 int valuelen)
113{
114 struct xchk_xattr *sx;
115 struct xfs_da_args args = { NULL };
116 int error = 0;
117
118 sx = container_of(context, struct xchk_xattr, context);
119
120 if (xchk_should_terminate(sx->sc, &error)) {
121 context->seen_enough = error;
122 return;
123 }
124
125 if (flags & XFS_ATTR_INCOMPLETE) {
126
127 xchk_ino_set_preen(sx->sc, context->dp->i_ino);
128 return;
129 }
130
131
132 if (!xfs_attr_namecheck(name, namelen)) {
133 xchk_fblock_set_corrupt(sx->sc, XFS_ATTR_FORK, args.blkno);
134 return;
135 }
136
137
138
139
140
141
142 error = xchk_setup_xattr_buf(sx->sc, valuelen, KM_MAYFAIL);
143 if (error == -ENOMEM)
144 error = -EDEADLOCK;
145 if (error) {
146 context->seen_enough = error;
147 return;
148 }
149
150 args.flags = ATTR_KERNOTIME;
151 if (flags & XFS_ATTR_ROOT)
152 args.flags |= ATTR_ROOT;
153 else if (flags & XFS_ATTR_SECURE)
154 args.flags |= ATTR_SECURE;
155 args.geo = context->dp->i_mount->m_attr_geo;
156 args.whichfork = XFS_ATTR_FORK;
157 args.dp = context->dp;
158 args.name = name;
159 args.namelen = namelen;
160 args.hashval = xfs_da_hashname(args.name, args.namelen);
161 args.trans = context->tp;
162 args.value = xchk_xattr_valuebuf(sx->sc);
163 args.valuelen = valuelen;
164
165 error = xfs_attr_get_ilocked(context->dp, &args);
166 if (error == -EEXIST)
167 error = 0;
168 if (!xchk_fblock_process_error(sx->sc, XFS_ATTR_FORK, args.blkno,
169 &error))
170 goto fail_xref;
171 if (args.valuelen != valuelen)
172 xchk_fblock_set_corrupt(sx->sc, XFS_ATTR_FORK,
173 args.blkno);
174fail_xref:
175 if (sx->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
176 context->seen_enough = XFS_ITER_ABORT;
177 return;
178}
179
180
181
182
183
184
185
186
187STATIC bool
188xchk_xattr_set_map(
189 struct xfs_scrub *sc,
190 unsigned long *map,
191 unsigned int start,
192 unsigned int len)
193{
194 unsigned int mapsize = sc->mp->m_attr_geo->blksize;
195 bool ret = true;
196
197 if (start >= mapsize)
198 return false;
199 if (start + len > mapsize) {
200 len = mapsize - start;
201 ret = false;
202 }
203
204 if (find_next_bit(map, mapsize, start) < start + len)
205 ret = false;
206 bitmap_set(map, start, len);
207
208 return ret;
209}
210
211
212
213
214
215STATIC bool
216xchk_xattr_check_freemap(
217 struct xfs_scrub *sc,
218 unsigned long *map,
219 struct xfs_attr3_icleaf_hdr *leafhdr)
220{
221 unsigned long *freemap = xchk_xattr_freemap(sc);
222 unsigned long *dstmap = xchk_xattr_dstmap(sc);
223 unsigned int mapsize = sc->mp->m_attr_geo->blksize;
224 int i;
225
226
227 bitmap_zero(freemap, mapsize);
228 for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; i++) {
229 if (!xchk_xattr_set_map(sc, freemap,
230 leafhdr->freemap[i].base,
231 leafhdr->freemap[i].size))
232 return false;
233 }
234
235
236 return bitmap_and(dstmap, freemap, map, mapsize) == 0;
237}
238
239
240
241
242
243STATIC void
244xchk_xattr_entry(
245 struct xchk_da_btree *ds,
246 int level,
247 char *buf_end,
248 struct xfs_attr_leafblock *leaf,
249 struct xfs_attr3_icleaf_hdr *leafhdr,
250 struct xfs_attr_leaf_entry *ent,
251 int idx,
252 unsigned int *usedbytes,
253 __u32 *last_hashval)
254{
255 struct xfs_mount *mp = ds->state->mp;
256 unsigned long *usedmap = xchk_xattr_usedmap(ds->sc);
257 char *name_end;
258 struct xfs_attr_leaf_name_local *lentry;
259 struct xfs_attr_leaf_name_remote *rentry;
260 unsigned int nameidx;
261 unsigned int namesize;
262
263 if (ent->pad2 != 0)
264 xchk_da_set_corrupt(ds, level);
265
266
267 if (be32_to_cpu(ent->hashval) < *last_hashval)
268 xchk_da_set_corrupt(ds, level);
269 *last_hashval = be32_to_cpu(ent->hashval);
270
271 nameidx = be16_to_cpu(ent->nameidx);
272 if (nameidx < leafhdr->firstused ||
273 nameidx >= mp->m_attr_geo->blksize) {
274 xchk_da_set_corrupt(ds, level);
275 return;
276 }
277
278
279 if (ent->flags & XFS_ATTR_LOCAL) {
280 lentry = xfs_attr3_leaf_name_local(leaf, idx);
281 namesize = xfs_attr_leaf_entsize_local(lentry->namelen,
282 be16_to_cpu(lentry->valuelen));
283 name_end = (char *)lentry + namesize;
284 if (lentry->namelen == 0)
285 xchk_da_set_corrupt(ds, level);
286 } else {
287 rentry = xfs_attr3_leaf_name_remote(leaf, idx);
288 namesize = xfs_attr_leaf_entsize_remote(rentry->namelen);
289 name_end = (char *)rentry + namesize;
290 if (rentry->namelen == 0 || rentry->valueblk == 0)
291 xchk_da_set_corrupt(ds, level);
292 }
293 if (name_end > buf_end)
294 xchk_da_set_corrupt(ds, level);
295
296 if (!xchk_xattr_set_map(ds->sc, usedmap, nameidx, namesize))
297 xchk_da_set_corrupt(ds, level);
298 if (!(ds->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT))
299 *usedbytes += namesize;
300}
301
302
303STATIC int
304xchk_xattr_block(
305 struct xchk_da_btree *ds,
306 int level)
307{
308 struct xfs_attr3_icleaf_hdr leafhdr;
309 struct xfs_mount *mp = ds->state->mp;
310 struct xfs_da_state_blk *blk = &ds->state->path.blk[level];
311 struct xfs_buf *bp = blk->bp;
312 xfs_dablk_t *last_checked = ds->private;
313 struct xfs_attr_leafblock *leaf = bp->b_addr;
314 struct xfs_attr_leaf_entry *ent;
315 struct xfs_attr_leaf_entry *entries;
316 unsigned long *usedmap;
317 char *buf_end;
318 size_t off;
319 __u32 last_hashval = 0;
320 unsigned int usedbytes = 0;
321 unsigned int hdrsize;
322 int i;
323 int error;
324
325 if (*last_checked == blk->blkno)
326 return 0;
327
328
329 error = xchk_setup_xattr_buf(ds->sc, 0, KM_MAYFAIL);
330 if (error == -ENOMEM)
331 return -EDEADLOCK;
332 if (error)
333 return error;
334 usedmap = xchk_xattr_usedmap(ds->sc);
335
336 *last_checked = blk->blkno;
337 bitmap_zero(usedmap, mp->m_attr_geo->blksize);
338
339
340 if (xfs_sb_version_hascrc(&ds->sc->mp->m_sb)) {
341 struct xfs_attr3_leafblock *leaf = bp->b_addr;
342
343 if (leaf->hdr.pad1 != 0 || leaf->hdr.pad2 != 0 ||
344 leaf->hdr.info.hdr.pad != 0)
345 xchk_da_set_corrupt(ds, level);
346 } else {
347 if (leaf->hdr.pad1 != 0 || leaf->hdr.info.pad != 0)
348 xchk_da_set_corrupt(ds, level);
349 }
350
351
352 xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &leafhdr, leaf);
353 hdrsize = xfs_attr3_leaf_hdr_size(leaf);
354
355 if (leafhdr.usedbytes > mp->m_attr_geo->blksize)
356 xchk_da_set_corrupt(ds, level);
357 if (leafhdr.firstused > mp->m_attr_geo->blksize)
358 xchk_da_set_corrupt(ds, level);
359 if (leafhdr.firstused < hdrsize)
360 xchk_da_set_corrupt(ds, level);
361 if (!xchk_xattr_set_map(ds->sc, usedmap, 0, hdrsize))
362 xchk_da_set_corrupt(ds, level);
363
364 if (ds->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
365 goto out;
366
367 entries = xfs_attr3_leaf_entryp(leaf);
368 if ((char *)&entries[leafhdr.count] > (char *)leaf + leafhdr.firstused)
369 xchk_da_set_corrupt(ds, level);
370
371 buf_end = (char *)bp->b_addr + mp->m_attr_geo->blksize;
372 for (i = 0, ent = entries; i < leafhdr.count; ent++, i++) {
373
374 off = (char *)ent - (char *)leaf;
375 if (!xchk_xattr_set_map(ds->sc, usedmap, off,
376 sizeof(xfs_attr_leaf_entry_t))) {
377 xchk_da_set_corrupt(ds, level);
378 goto out;
379 }
380
381
382 xchk_xattr_entry(ds, level, buf_end, leaf, &leafhdr,
383 ent, i, &usedbytes, &last_hashval);
384
385 if (ds->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
386 goto out;
387 }
388
389 if (!xchk_xattr_check_freemap(ds->sc, usedmap, &leafhdr))
390 xchk_da_set_corrupt(ds, level);
391
392 if (leafhdr.usedbytes != usedbytes)
393 xchk_da_set_corrupt(ds, level);
394
395out:
396 return 0;
397}
398
399
400STATIC int
401xchk_xattr_rec(
402 struct xchk_da_btree *ds,
403 int level,
404 void *rec)
405{
406 struct xfs_mount *mp = ds->state->mp;
407 struct xfs_attr_leaf_entry *ent = rec;
408 struct xfs_da_state_blk *blk;
409 struct xfs_attr_leaf_name_local *lentry;
410 struct xfs_attr_leaf_name_remote *rentry;
411 struct xfs_buf *bp;
412 xfs_dahash_t calc_hash;
413 xfs_dahash_t hash;
414 int nameidx;
415 int hdrsize;
416 unsigned int badflags;
417 int error;
418
419 blk = &ds->state->path.blk[level];
420
421
422 error = xchk_xattr_block(ds, level);
423 if (error)
424 goto out;
425 if (ds->sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
426 goto out;
427
428
429 error = xchk_da_btree_hash(ds, level, &ent->hashval);
430 if (error)
431 goto out;
432
433
434 bp = blk->bp;
435 hdrsize = xfs_attr3_leaf_hdr_size(bp->b_addr);
436 nameidx = be16_to_cpu(ent->nameidx);
437 if (nameidx < hdrsize || nameidx >= mp->m_attr_geo->blksize) {
438 xchk_da_set_corrupt(ds, level);
439 goto out;
440 }
441
442
443 hash = be32_to_cpu(ent->hashval);
444 badflags = ~(XFS_ATTR_LOCAL | XFS_ATTR_ROOT | XFS_ATTR_SECURE |
445 XFS_ATTR_INCOMPLETE);
446 if ((ent->flags & badflags) != 0)
447 xchk_da_set_corrupt(ds, level);
448 if (ent->flags & XFS_ATTR_LOCAL) {
449 lentry = (struct xfs_attr_leaf_name_local *)
450 (((char *)bp->b_addr) + nameidx);
451 if (lentry->namelen <= 0) {
452 xchk_da_set_corrupt(ds, level);
453 goto out;
454 }
455 calc_hash = xfs_da_hashname(lentry->nameval, lentry->namelen);
456 } else {
457 rentry = (struct xfs_attr_leaf_name_remote *)
458 (((char *)bp->b_addr) + nameidx);
459 if (rentry->namelen <= 0) {
460 xchk_da_set_corrupt(ds, level);
461 goto out;
462 }
463 calc_hash = xfs_da_hashname(rentry->name, rentry->namelen);
464 }
465 if (calc_hash != hash)
466 xchk_da_set_corrupt(ds, level);
467
468out:
469 return error;
470}
471
472
473int
474xchk_xattr(
475 struct xfs_scrub *sc)
476{
477 struct xchk_xattr sx;
478 struct attrlist_cursor_kern cursor = { 0 };
479 xfs_dablk_t last_checked = -1U;
480 int error = 0;
481
482 if (!xfs_inode_hasattr(sc->ip))
483 return -ENOENT;
484
485 memset(&sx, 0, sizeof(sx));
486
487 error = xchk_da_btree(sc, XFS_ATTR_FORK, xchk_xattr_rec,
488 &last_checked);
489 if (error)
490 goto out;
491
492 if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
493 goto out;
494
495
496 sx.context.dp = sc->ip;
497 sx.context.cursor = &cursor;
498 sx.context.resynch = 1;
499 sx.context.put_listent = xchk_xattr_listent;
500 sx.context.tp = sc->tp;
501 sx.context.flags = ATTR_INCOMPLETE;
502 sx.sc = sc;
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520 error = xfs_attr_list_int_ilocked(&sx.context);
521 if (!xchk_fblock_process_error(sc, XFS_ATTR_FORK, 0, &error))
522 goto out;
523
524
525 if (sx.context.seen_enough < 0)
526 error = sx.context.seen_enough;
527out:
528 return error;
529}
530