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hc
2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/fs/xfs/xfs_attr_list.c
....@@ -6,25 +6,20 @@
66  */
77 #include "xfs.h"
88 #include "xfs_fs.h"
9
+#include "xfs_shared.h"
910 #include "xfs_format.h"
1011 #include "xfs_log_format.h"
1112 #include "xfs_trans_resv.h"
12
-#include "xfs_bit.h"
1313 #include "xfs_mount.h"
1414 #include "xfs_da_format.h"
15
-#include "xfs_da_btree.h"
1615 #include "xfs_inode.h"
1716 #include "xfs_trans.h"
18
-#include "xfs_inode_item.h"
1917 #include "xfs_bmap.h"
2018 #include "xfs_attr.h"
2119 #include "xfs_attr_sf.h"
22
-#include "xfs_attr_remote.h"
2320 #include "xfs_attr_leaf.h"
2421 #include "xfs_error.h"
2522 #include "xfs_trace.h"
26
-#include "xfs_buf_item.h"
27
-#include "xfs_cksum.h"
2823 #include "xfs_dir2.h"
2924 
3025 STATIC int
....@@ -49,30 +44,27 @@
4944 /*
5045  * Copy out entries of shortform attribute lists for attr_list().
5146  * Shortform attribute lists are not stored in hashval sorted order.
52
- * If the output buffer is not large enough to hold them all, then we
47
+ * If the output buffer is not large enough to hold them all, then
5348  * we have to calculate each entries' hashvalue and sort them before
5449  * we can begin returning them to the user.
5550  */
5651 static int
57
-xfs_attr_shortform_list(xfs_attr_list_context_t *context)
52
+xfs_attr_shortform_list(
53
+	struct xfs_attr_list_context	*context)
5854 {
59
-	attrlist_cursor_kern_t *cursor;
60
-	xfs_attr_sf_sort_t *sbuf, *sbp;
61
-	xfs_attr_shortform_t *sf;
62
-	xfs_attr_sf_entry_t *sfe;
63
-	xfs_inode_t *dp;
64
-	int sbsize, nsbuf, count, i;
55
+	struct xfs_attrlist_cursor_kern	*cursor = &context->cursor;
56
+	struct xfs_inode		*dp = context->dp;
57
+	struct xfs_attr_sf_sort		*sbuf, *sbp;
58
+	struct xfs_attr_shortform	*sf;
59
+	struct xfs_attr_sf_entry	*sfe;
60
+	int				sbsize, nsbuf, count, i;
61
+	int				error = 0;
6562 
66
-	ASSERT(context != NULL);
67
-	dp = context->dp;
68
-	ASSERT(dp != NULL);
6963 	ASSERT(dp->i_afp != NULL);
70
-	sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
64
+	sf = (struct xfs_attr_shortform *)dp->i_afp->if_u1.if_data;
7165 	ASSERT(sf != NULL);
7266 	if (!sf->hdr.count)
7367 		return 0;
74
-	cursor = context->cursor;
75
-	ASSERT(cursor != NULL);
7668 
7769 	trace_xfs_attr_list_sf(context);
7870 
....@@ -89,6 +81,10 @@
8981 	    (XFS_ISRESET_CURSOR(cursor) &&
9082 	     (dp->i_afp->if_bytes + sf->hdr.count * 16) < context->bufsize)) {
9183 		for (i = 0, sfe = &sf->list[0]; i < sf->hdr.count; i++) {
84
+			if (XFS_IS_CORRUPT(context->dp->i_mount,
85
+					   !xfs_attr_namecheck(sfe->nameval,
86
+							       sfe->namelen)))
87
+				return -EFSCORRUPTED;
9288 			context->put_listent(context,
9389 					     sfe->flags,
9490 					     sfe->nameval,
....@@ -100,7 +96,7 @@
10096 			 */
10197 			if (context->seen_enough)
10298 				break;
103
-			sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
99
+			sfe = xfs_attr_sf_nextentry(sfe);
104100 		}
105101 		trace_xfs_attr_list_sf_all(context);
106102 		return 0;
....@@ -114,7 +110,7 @@
114110 	 * It didn't all fit, so we have to sort everything on hashval.
115111 	 */
116112 	sbsize = sf->hdr.count * sizeof(*sbuf);
117
-	sbp = sbuf = kmem_alloc(sbsize, KM_SLEEP | KM_NOFS);
113
+	sbp = sbuf = kmem_alloc(sbsize, KM_NOFS);
118114 
119115 	/*
120116 	 * Scan the attribute list for the rest of the entries, storing
....@@ -140,7 +136,7 @@
140136 		/* These are bytes, and both on-disk, don't endian-flip */
141137 		sbp->valuelen = sfe->valuelen;
142138 		sbp->flags = sfe->flags;
143
-		sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
139
+		sfe = xfs_attr_sf_nextentry(sfe);
144140 		sbp++;
145141 		nsbuf++;
146142 	}
....@@ -166,10 +162,8 @@
166162 			break;
167163 		}
168164 	}
169
-	if (i == nsbuf) {
170
-		kmem_free(sbuf);
171
-		return 0;
172
-	}
165
+	if (i == nsbuf)
166
+		goto out;
173167 
174168 	/*
175169 	 * Loop putting entries into the user buffer.
....@@ -178,6 +172,12 @@
178172 		if (cursor->hashval != sbp->hash) {
179173 			cursor->hashval = sbp->hash;
180174 			cursor->offset = 0;
175
+		}
176
+		if (XFS_IS_CORRUPT(context->dp->i_mount,
177
+				   !xfs_attr_namecheck(sbp->name,
178
+						       sbp->namelen))) {
179
+			error = -EFSCORRUPTED;
180
+			goto out;
181181 		}
182182 		context->put_listent(context,
183183 				     sbp->flags,
....@@ -188,9 +188,9 @@
188188 			break;
189189 		cursor->offset++;
190190 	}
191
-
191
+out:
192192 	kmem_free(sbuf);
193
-	return 0;
193
+	return error;
194194 }
195195 
196196 /*
....@@ -200,7 +200,7 @@
200200 STATIC int
201201 xfs_attr_node_list_lookup(
202202 	struct xfs_attr_list_context	*context,
203
-	struct attrlist_cursor_kern	*cursor,
203
+	struct xfs_attrlist_cursor_kern	*cursor,
204204 	struct xfs_buf			**pbp)
205205 {
206206 	struct xfs_da3_icnode_hdr	nodehdr;
....@@ -218,7 +218,7 @@
218218 	ASSERT(*pbp == NULL);
219219 	cursor->blkno = 0;
220220 	for (;;) {
221
-		error = xfs_da3_node_read(tp, dp, cursor->blkno, -1, &bp,
221
+		error = xfs_da3_node_read(tp, dp, cursor->blkno, &bp,
222222 				XFS_ATTR_FORK);
223223 		if (error)
224224 			return error;
....@@ -234,7 +234,7 @@
234234 			goto out_corruptbuf;
235235 		}
236236 
237
-		dp->d_ops->node_hdr_from_disk(&nodehdr, node);
237
+		xfs_da3_node_hdr_from_disk(mp, &nodehdr, node);
238238 
239239 		/* Tree taller than we can handle; bail out! */
240240 		if (nodehdr.level >= XFS_DA_NODE_MAXDEPTH)
....@@ -248,7 +248,7 @@
248248 		else
249249 			expected_level--;
250250 
251
-		btree = dp->d_ops->node_tree_p(node);
251
+		btree = nodehdr.btree;
252252 		for (i = 0; i < nodehdr.count; btree++, i++) {
253253 			if (cursor->hashval <= be32_to_cpu(btree->hashval)) {
254254 				cursor->blkno = be32_to_cpu(btree->before);
....@@ -263,7 +263,7 @@
263263 			return 0;
264264 
265265 		/* We can't point back to the root. */
266
-		if (cursor->blkno == 0)
266
+		if (XFS_IS_CORRUPT(mp, cursor->blkno == 0))
267267 			return -EFSCORRUPTED;
268268 	}
269269 
....@@ -274,6 +274,7 @@
274274 	return 0;
275275 
276276 out_corruptbuf:
277
+	xfs_buf_mark_corrupt(bp);
277278 	xfs_trans_brelse(tp, bp);
278279 	return -EFSCORRUPTED;
279280 }
....@@ -282,18 +283,17 @@
282283 xfs_attr_node_list(
283284 	struct xfs_attr_list_context	*context)
284285 {
286
+	struct xfs_attrlist_cursor_kern	*cursor = &context->cursor;
285287 	struct xfs_attr3_icleaf_hdr	leafhdr;
286
-	struct attrlist_cursor_kern	*cursor;
287288 	struct xfs_attr_leafblock	*leaf;
288289 	struct xfs_da_intnode		*node;
289290 	struct xfs_buf			*bp;
290291 	struct xfs_inode		*dp = context->dp;
291292 	struct xfs_mount		*mp = dp->i_mount;
292
-	int				error;
293
+	int				error = 0;
293294 
294295 	trace_xfs_attr_node_list(context);
295296 
296
-	cursor = context->cursor;
297297 	cursor->initted = 1;
298298 
299299 	/*
....@@ -303,8 +303,8 @@
303303 	 */
304304 	bp = NULL;
305305 	if (cursor->blkno > 0) {
306
-		error = xfs_da3_node_read(context->tp, dp, cursor->blkno, -1,
307
-					      &bp, XFS_ATTR_FORK);
306
+		error = xfs_da3_node_read(context->tp, dp, cursor->blkno, &bp,
307
+				XFS_ATTR_FORK);
308308 		if ((error != 0) && (error != -EFSCORRUPTED))
309309 			return error;
310310 		if (bp) {
....@@ -363,29 +363,32 @@
363363 	 */
364364 	for (;;) {
365365 		leaf = bp->b_addr;
366
-		xfs_attr3_leaf_list_int(bp, context);
366
+		error = xfs_attr3_leaf_list_int(bp, context);
367
+		if (error)
368
+			break;
367369 		xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &leafhdr, leaf);
368370 		if (context->seen_enough || leafhdr.forw == 0)
369371 			break;
370372 		cursor->blkno = leafhdr.forw;
371373 		xfs_trans_brelse(context->tp, bp);
372
-		error = xfs_attr3_leaf_read(context->tp, dp, cursor->blkno, -1, &bp);
374
+		error = xfs_attr3_leaf_read(context->tp, dp, cursor->blkno,
375
+					    &bp);
373376 		if (error)
374377 			return error;
375378 	}
376379 	xfs_trans_brelse(context->tp, bp);
377
-	return 0;
380
+	return error;
378381 }
379382 
380383 /*
381384  * Copy out attribute list entries for attr_list(), for leaf attribute lists.
382385  */
383
-void
386
+int
384387 xfs_attr3_leaf_list_int(
385388 	struct xfs_buf			*bp,
386389 	struct xfs_attr_list_context	*context)
387390 {
388
-	struct attrlist_cursor_kern	*cursor;
391
+	struct xfs_attrlist_cursor_kern	*cursor = &context->cursor;
389392 	struct xfs_attr_leafblock	*leaf;
390393 	struct xfs_attr3_icleaf_hdr	ichdr;
391394 	struct xfs_attr_leaf_entry	*entries;
....@@ -399,7 +402,6 @@
399402 	xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &ichdr, leaf);
400403 	entries = xfs_attr3_leaf_entryp(leaf);
401404 
402
-	cursor = context->cursor;
403405 	cursor->initted = 1;
404406 
405407 	/*
....@@ -422,7 +424,7 @@
422424 		}
423425 		if (i == ichdr.count) {
424426 			trace_xfs_attr_list_notfound(context);
425
-			return;
427
+			return 0;
426428 		}
427429 	} else {
428430 		entry = &entries[0];
....@@ -443,8 +445,8 @@
443445 		}
444446 
445447 		if ((entry->flags & XFS_ATTR_INCOMPLETE) &&
446
-		    !(context->flags & ATTR_INCOMPLETE))
447
-			continue;		/* skip incomplete entries */
448
+		    !context->allow_incomplete)
449
+			continue;
448450 
449451 		if (entry->flags & XFS_ATTR_LOCAL) {
450452 			xfs_attr_leaf_name_local_t *name_loc;
....@@ -462,6 +464,9 @@
462464 			valuelen = be32_to_cpu(name_rmt->valuelen);
463465 		}
464466 
467
+		if (XFS_IS_CORRUPT(context->dp->i_mount,
468
+				   !xfs_attr_namecheck(name, namelen)))
469
+			return -EFSCORRUPTED;
465470 		context->put_listent(context, entry->flags,
466471 					      name, namelen, valuelen);
467472 		if (context->seen_enough)
....@@ -469,32 +474,33 @@
469474 		cursor->offset++;
470475 	}
471476 	trace_xfs_attr_list_leaf_end(context);
472
-	return;
477
+	return 0;
473478 }
474479 
475480 /*
476481  * Copy out attribute entries for attr_list(), for leaf attribute lists.
477482  */
478483 STATIC int
479
-xfs_attr_leaf_list(xfs_attr_list_context_t *context)
484
+xfs_attr_leaf_list(
485
+	struct xfs_attr_list_context	*context)
480486 {
481
-	int error;
482
-	struct xfs_buf *bp;
487
+	struct xfs_buf			*bp;
488
+	int				error;
483489 
484490 	trace_xfs_attr_leaf_list(context);
485491 
486
-	context->cursor->blkno = 0;
487
-	error = xfs_attr3_leaf_read(context->tp, context->dp, 0, -1, &bp);
492
+	context->cursor.blkno = 0;
493
+	error = xfs_attr3_leaf_read(context->tp, context->dp, 0, &bp);
488494 	if (error)
489495 		return error;
490496 
491
-	xfs_attr3_leaf_list_int(bp, context);
497
+	error = xfs_attr3_leaf_list_int(bp, context);
492498 	xfs_trans_brelse(context->tp, bp);
493
-	return 0;
499
+	return error;
494500 }
495501 
496502 int
497
-xfs_attr_list_int_ilocked(
503
+xfs_attr_list_ilocked(
498504 	struct xfs_attr_list_context	*context)
499505 {
500506 	struct xfs_inode		*dp = context->dp;
....@@ -506,20 +512,20 @@
506512 	 */
507513 	if (!xfs_inode_hasattr(dp))
508514 		return 0;
509
-	else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL)
515
+	if (dp->i_afp->if_format == XFS_DINODE_FMT_LOCAL)
510516 		return xfs_attr_shortform_list(context);
511
-	else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK))
517
+	if (xfs_bmap_one_block(dp, XFS_ATTR_FORK))
512518 		return xfs_attr_leaf_list(context);
513519 	return xfs_attr_node_list(context);
514520 }
515521 
516522 int
517
-xfs_attr_list_int(
518
-	xfs_attr_list_context_t *context)
523
+xfs_attr_list(
524
+	struct xfs_attr_list_context	*context)
519525 {
520
-	int error;
521
-	xfs_inode_t *dp = context->dp;
522
-	uint		lock_mode;
526
+	struct xfs_inode		*dp = context->dp;
527
+	uint				lock_mode;
528
+	int				error;
523529 
524530 	XFS_STATS_INC(dp->i_mount, xs_attr_list);
525531 
....@@ -527,130 +533,7 @@
527533 		return -EIO;
528534 
529535 	lock_mode = xfs_ilock_attr_map_shared(dp);
530
-	error = xfs_attr_list_int_ilocked(context);
536
+	error = xfs_attr_list_ilocked(context);
531537 	xfs_iunlock(dp, lock_mode);
532
-	return error;
533
-}
534
-
535
-#define	ATTR_ENTBASESIZE		/* minimum bytes used by an attr */ \
536
-	(((struct attrlist_ent *) 0)->a_name - (char *) 0)
537
-#define	ATTR_ENTSIZE(namelen)		/* actual bytes used by an attr */ \
538
-	((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(uint32_t)-1) \
539
-	 & ~(sizeof(uint32_t)-1))
540
-
541
-/*
542
- * Format an attribute and copy it out to the user's buffer.
543
- * Take care to check values and protect against them changing later,
544
- * we may be reading them directly out of a user buffer.
545
- */
546
-STATIC void
547
-xfs_attr_put_listent(
548
-	xfs_attr_list_context_t *context,
549
-	int		flags,
550
-	unsigned char	*name,
551
-	int		namelen,
552
-	int		valuelen)
553
-{
554
-	struct attrlist *alist = (struct attrlist *)context->alist;
555
-	attrlist_ent_t *aep;
556
-	int arraytop;
557
-
558
-	ASSERT(!context->seen_enough);
559
-	ASSERT(!(context->flags & ATTR_KERNOVAL));
560
-	ASSERT(context->count >= 0);
561
-	ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
562
-	ASSERT(context->firstu >= sizeof(*alist));
563
-	ASSERT(context->firstu <= context->bufsize);
564
-
565
-	/*
566
-	 * Only list entries in the right namespace.
567
-	 */
568
-	if (((context->flags & ATTR_SECURE) == 0) !=
569
-	    ((flags & XFS_ATTR_SECURE) == 0))
570
-		return;
571
-	if (((context->flags & ATTR_ROOT) == 0) !=
572
-	    ((flags & XFS_ATTR_ROOT) == 0))
573
-		return;
574
-
575
-	arraytop = sizeof(*alist) +
576
-			context->count * sizeof(alist->al_offset[0]);
577
-	context->firstu -= ATTR_ENTSIZE(namelen);
578
-	if (context->firstu < arraytop) {
579
-		trace_xfs_attr_list_full(context);
580
-		alist->al_more = 1;
581
-		context->seen_enough = 1;
582
-		return;
583
-	}
584
-
585
-	aep = (attrlist_ent_t *)&context->alist[context->firstu];
586
-	aep->a_valuelen = valuelen;
587
-	memcpy(aep->a_name, name, namelen);
588
-	aep->a_name[namelen] = 0;
589
-	alist->al_offset[context->count++] = context->firstu;
590
-	alist->al_count = context->count;
591
-	trace_xfs_attr_list_add(context);
592
-	return;
593
-}
594
-
595
-/*
596
- * Generate a list of extended attribute names and optionally
597
- * also value lengths.  Positive return value follows the XFS
598
- * convention of being an error, zero or negative return code
599
- * is the length of the buffer returned (negated), indicating
600
- * success.
601
- */
602
-int
603
-xfs_attr_list(
604
-	xfs_inode_t	*dp,
605
-	char		*buffer,
606
-	int		bufsize,
607
-	int		flags,
608
-	attrlist_cursor_kern_t *cursor)
609
-{
610
-	xfs_attr_list_context_t context;
611
-	struct attrlist *alist;
612
-	int error;
613
-
614
-	/*
615
-	 * Validate the cursor.
616
-	 */
617
-	if (cursor->pad1 || cursor->pad2)
618
-		return -EINVAL;
619
-	if ((cursor->initted == 0) &&
620
-	    (cursor->hashval || cursor->blkno || cursor->offset))
621
-		return -EINVAL;
622
-
623
-	/* Only internal consumers can retrieve incomplete attrs. */
624
-	if (flags & ATTR_INCOMPLETE)
625
-		return -EINVAL;
626
-
627
-	/*
628
-	 * Check for a properly aligned buffer.
629
-	 */
630
-	if (((long)buffer) & (sizeof(int)-1))
631
-		return -EFAULT;
632
-	if (flags & ATTR_KERNOVAL)
633
-		bufsize = 0;
634
-
635
-	/*
636
-	 * Initialize the output buffer.
637
-	 */
638
-	memset(&context, 0, sizeof(context));
639
-	context.dp = dp;
640
-	context.cursor = cursor;
641
-	context.resynch = 1;
642
-	context.flags = flags;
643
-	context.alist = buffer;
644
-	context.bufsize = (bufsize & ~(sizeof(int)-1));  /* align */
645
-	context.firstu = context.bufsize;
646
-	context.put_listent = xfs_attr_put_listent;
647
-
648
-	alist = (struct attrlist *)context.alist;
649
-	alist->al_count = 0;
650
-	alist->al_more = 0;
651
-	alist->al_offset[0] = context.bufsize;
652
-
653
-	error = xfs_attr_list_int(&context);
654
-	ASSERT(error <= 0);
655538 	return error;
656539 }