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2024-09-20 cf4ce59b3b70238352c7f1729f0f7223214828ad 
 kernel/fs/ubifs/sb.c
....@@ -1,20 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * This file is part of UBIFS.
34  *
45  * Copyright (C) 2006-2008 Nokia Corporation.
5
- *
6
- * This program is free software; you can redistribute it and/or modify it
7
- * under the terms of the GNU General Public License version 2 as published by
8
- * the Free Software Foundation.
9
- *
10
- * This program is distributed in the hope that it will be useful, but WITHOUT
11
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13
- * more details.
14
- *
15
- * You should have received a copy of the GNU General Public License along with
16
- * this program; if not, write to the Free Software Foundation, Inc., 51
17
- * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
186  *
197  * Authors: Artem Bityutskiy (Битюцкий Артём)
208  *          Adrian Hunter
....@@ -93,10 +81,12 @@
9381 	int err, tmp, jnl_lebs, log_lebs, max_buds, main_lebs, main_first;
9482 	int lpt_lebs, lpt_first, orph_lebs, big_lpt, ino_waste, sup_flags = 0;
9583 	int min_leb_cnt = UBIFS_MIN_LEB_CNT;
84
+	int idx_node_size;
9685 	long long tmp64, main_bytes;
9786 	__le64 tmp_le64;
98
-	__le32 tmp_le32;
9987 	struct timespec64 ts;
88
+	u8 hash[UBIFS_HASH_ARR_SZ];
89
+	u8 hash_lpt[UBIFS_HASH_ARR_SZ];
10090 
10191 	/* Some functions called from here depend on the @c->key_len filed */
10292 	c->key_len = UBIFS_SK_LEN;
....@@ -158,7 +148,7 @@
158148 	c->lsave_cnt = DEFAULT_LSAVE_CNT;
159149 	c->max_leb_cnt = c->leb_cnt;
160150 	err = ubifs_create_dflt_lpt(c, &main_lebs, lpt_first, &lpt_lebs,
161
-				    &big_lpt);
151
+				    &big_lpt, hash_lpt);
162152 	if (err)
163153 		return err;
164154 
....@@ -167,16 +157,35 @@
167157 
168158 	main_first = c->leb_cnt - main_lebs;
169159 
160
+	sup = kzalloc(ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size), GFP_KERNEL);
161
+	mst = kzalloc(c->mst_node_alsz, GFP_KERNEL);
162
+	idx_node_size = ubifs_idx_node_sz(c, 1);
163
+	idx = kzalloc(ALIGN(idx_node_size, c->min_io_size), GFP_KERNEL);
164
+	ino = kzalloc(ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size), GFP_KERNEL);
165
+	cs = kzalloc(ALIGN(UBIFS_CS_NODE_SZ, c->min_io_size), GFP_KERNEL);
166
+
167
+	if (!sup || !mst || !idx || !ino || !cs) {
168
+		err = -ENOMEM;
169
+		goto out;
170
+	}
171
+
170172 	/* Create default superblock */
171
-	tmp = ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size);
172
-	sup = kzalloc(tmp, GFP_KERNEL);
173
-	if (!sup)
174
-		return -ENOMEM;
175173 
176174 	tmp64 = (long long)max_buds * c->leb_size;
177175 	if (big_lpt)
178176 		sup_flags |= UBIFS_FLG_BIGLPT;
179
-	sup_flags |= UBIFS_FLG_DOUBLE_HASH;
177
+	if (ubifs_default_version > 4)
178
+		sup_flags |= UBIFS_FLG_DOUBLE_HASH;
179
+
180
+	if (ubifs_authenticated(c)) {
181
+		sup_flags |= UBIFS_FLG_AUTHENTICATION;
182
+		sup->hash_algo = cpu_to_le16(c->auth_hash_algo);
183
+		err = ubifs_hmac_wkm(c, sup->hmac_wkm);
184
+		if (err)
185
+			goto out;
186
+	} else {
187
+		sup->hash_algo = cpu_to_le16(0xffff);
188
+	}
180189 
181190 	sup->ch.node_type  = UBIFS_SB_NODE;
182191 	sup->key_hash      = UBIFS_KEY_HASH_R5;
....@@ -192,7 +201,7 @@
192201 	sup->jhead_cnt     = cpu_to_le32(DEFAULT_JHEADS_CNT);
193202 	sup->fanout        = cpu_to_le32(DEFAULT_FANOUT);
194203 	sup->lsave_cnt     = cpu_to_le32(c->lsave_cnt);
195
-	sup->fmt_version   = cpu_to_le32(UBIFS_FORMAT_VERSION);
204
+	sup->fmt_version   = cpu_to_le32(ubifs_default_version);
196205 	sup->time_gran     = cpu_to_le32(DEFAULT_TIME_GRAN);
197206 	if (c->mount_opts.override_compr)
198207 		sup->default_compr = cpu_to_le16(c->mount_opts.compr_type);
....@@ -208,17 +217,9 @@
208217 	sup->rp_size = cpu_to_le64(tmp64);
209218 	sup->ro_compat_version = cpu_to_le32(UBIFS_RO_COMPAT_VERSION);
210219 
211
-	err = ubifs_write_node(c, sup, UBIFS_SB_NODE_SZ, 0, 0);
212
-	kfree(sup);
213
-	if (err)
214
-		return err;
215
-
216220 	dbg_gen("default superblock created at LEB 0:0");
217221 
218222 	/* Create default master node */
219
-	mst = kzalloc(c->mst_node_alsz, GFP_KERNEL);
220
-	if (!mst)
221
-		return -ENOMEM;
222223 
223224 	mst->ch.node_type = UBIFS_MST_NODE;
224225 	mst->log_lnum     = cpu_to_le32(UBIFS_LOG_LNUM);
....@@ -244,6 +245,7 @@
244245 	mst->empty_lebs   = cpu_to_le32(main_lebs - 2);
245246 	mst->idx_lebs     = cpu_to_le32(1);
246247 	mst->leb_cnt      = cpu_to_le32(c->leb_cnt);
248
+	ubifs_copy_hash(c, hash_lpt, mst->hash_lpt);
247249 
248250 	/* Calculate lprops statistics */
249251 	tmp64 = main_bytes;
....@@ -264,24 +266,9 @@
264266 
265267 	mst->total_used = cpu_to_le64(UBIFS_INO_NODE_SZ);
266268 
267
-	err = ubifs_write_node(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM, 0);
268
-	if (err) {
269
-		kfree(mst);
270
-		return err;
271
-	}
272
-	err = ubifs_write_node(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM + 1,
273
-			       0);
274
-	kfree(mst);
275
-	if (err)
276
-		return err;
277
-
278269 	dbg_gen("default master node created at LEB %d:0", UBIFS_MST_LNUM);
279270 
280271 	/* Create the root indexing node */
281
-	tmp = ubifs_idx_node_sz(c, 1);
282
-	idx = kzalloc(ALIGN(tmp, c->min_io_size), GFP_KERNEL);
283
-	if (!idx)
284
-		return -ENOMEM;
285272 
286273 	c->key_fmt = UBIFS_SIMPLE_KEY_FMT;
287274 	c->key_hash = key_r5_hash;
....@@ -293,46 +280,30 @@
293280 	key_write_idx(c, &key, &br->key);
294281 	br->lnum = cpu_to_le32(main_first + DEFAULT_DATA_LEB);
295282 	br->len  = cpu_to_le32(UBIFS_INO_NODE_SZ);
296
-	err = ubifs_write_node(c, idx, tmp, main_first + DEFAULT_IDX_LEB, 0);
297
-	kfree(idx);
298
-	if (err)
299
-		return err;
300283 
301284 	dbg_gen("default root indexing node created LEB %d:0",
302285 		main_first + DEFAULT_IDX_LEB);
303286 
304287 	/* Create default root inode */
305
-	tmp = ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size);
306
-	ino = kzalloc(tmp, GFP_KERNEL);
307
-	if (!ino)
308
-		return -ENOMEM;
309288 
310289 	ino_key_init_flash(c, &ino->key, UBIFS_ROOT_INO);
311290 	ino->ch.node_type = UBIFS_INO_NODE;
312291 	ino->creat_sqnum = cpu_to_le64(++c->max_sqnum);
313292 	ino->nlink = cpu_to_le32(2);
314293 
315
-	ktime_get_real_ts64(&ts);
316
-	ts = timespec64_trunc(ts, DEFAULT_TIME_GRAN);
294
+	ktime_get_coarse_real_ts64(&ts);
317295 	tmp_le64 = cpu_to_le64(ts.tv_sec);
318296 	ino->atime_sec   = tmp_le64;
319297 	ino->ctime_sec   = tmp_le64;
320298 	ino->mtime_sec   = tmp_le64;
321
-	tmp_le32 = cpu_to_le32(ts.tv_nsec);
322
-	ino->atime_nsec  = tmp_le32;
323
-	ino->ctime_nsec  = tmp_le32;
324
-	ino->mtime_nsec  = tmp_le32;
299
+	ino->atime_nsec  = 0;
300
+	ino->ctime_nsec  = 0;
301
+	ino->mtime_nsec  = 0;
325302 	ino->mode = cpu_to_le32(S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO);
326303 	ino->size = cpu_to_le64(UBIFS_INO_NODE_SZ);
327304 
328305 	/* Set compression enabled by default */
329306 	ino->flags = cpu_to_le32(UBIFS_COMPR_FL);
330
-
331
-	err = ubifs_write_node(c, ino, UBIFS_INO_NODE_SZ,
332
-			       main_first + DEFAULT_DATA_LEB, 0);
333
-	kfree(ino);
334
-	if (err)
335
-		return err;
336307 
337308 	dbg_gen("root inode created at LEB %d:0",
338309 		main_first + DEFAULT_DATA_LEB);
....@@ -342,19 +313,54 @@
342313 	 * always the case during normal file-system operation. Write a fake
343314 	 * commit start node to the log.
344315 	 */
345
-	tmp = ALIGN(UBIFS_CS_NODE_SZ, c->min_io_size);
346
-	cs = kzalloc(tmp, GFP_KERNEL);
347
-	if (!cs)
348
-		return -ENOMEM;
349316 
350317 	cs->ch.node_type = UBIFS_CS_NODE;
351
-	err = ubifs_write_node(c, cs, UBIFS_CS_NODE_SZ, UBIFS_LOG_LNUM, 0);
352
-	kfree(cs);
318
+
319
+	err = ubifs_write_node_hmac(c, sup, UBIFS_SB_NODE_SZ, 0, 0,
320
+				    offsetof(struct ubifs_sb_node, hmac));
353321 	if (err)
354
-		return err;
322
+		goto out;
323
+
324
+	err = ubifs_write_node(c, ino, UBIFS_INO_NODE_SZ,
325
+			       main_first + DEFAULT_DATA_LEB, 0);
326
+	if (err)
327
+		goto out;
328
+
329
+	ubifs_node_calc_hash(c, ino, hash);
330
+	ubifs_copy_hash(c, hash, ubifs_branch_hash(c, br));
331
+
332
+	err = ubifs_write_node(c, idx, idx_node_size, main_first + DEFAULT_IDX_LEB, 0);
333
+	if (err)
334
+		goto out;
335
+
336
+	ubifs_node_calc_hash(c, idx, hash);
337
+	ubifs_copy_hash(c, hash, mst->hash_root_idx);
338
+
339
+	err = ubifs_write_node_hmac(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM, 0,
340
+		offsetof(struct ubifs_mst_node, hmac));
341
+	if (err)
342
+		goto out;
343
+
344
+	err = ubifs_write_node_hmac(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM + 1,
345
+			       0, offsetof(struct ubifs_mst_node, hmac));
346
+	if (err)
347
+		goto out;
348
+
349
+	err = ubifs_write_node(c, cs, UBIFS_CS_NODE_SZ, UBIFS_LOG_LNUM, 0);
350
+	if (err)
351
+		goto out;
355352 
356353 	ubifs_msg(c, "default file-system created");
357
-	return 0;
354
+
355
+	err = 0;
356
+out:
357
+	kfree(sup);
358
+	kfree(mst);
359
+	kfree(idx);
360
+	kfree(ino);
361
+	kfree(cs);
362
+
363
+	return err;
358364 }
359365 
360366 /**
....@@ -509,7 +515,7 @@
509515  * code. Note, the user of this function is responsible of kfree()'ing the
510516  * returned superblock buffer.
511517  */
512
-struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c)
518
+static struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c)
513519 {
514520 	struct ubifs_sb_node *sup;
515521 	int err;
....@@ -528,6 +534,74 @@
528534 	return sup;
529535 }
530536 
537
+static int authenticate_sb_node(struct ubifs_info *c,
538
+				const struct ubifs_sb_node *sup)
539
+{
540
+	unsigned int sup_flags = le32_to_cpu(sup->flags);
541
+	u8 hmac_wkm[UBIFS_HMAC_ARR_SZ];
542
+	int authenticated = !!(sup_flags & UBIFS_FLG_AUTHENTICATION);
543
+	int hash_algo;
544
+	int err;
545
+
546
+	if (c->authenticated && !authenticated) {
547
+		ubifs_err(c, "authenticated FS forced, but found FS without authentication");
548
+		return -EINVAL;
549
+	}
550
+
551
+	if (!c->authenticated && authenticated) {
552
+		ubifs_err(c, "authenticated FS found, but no key given");
553
+		return -EINVAL;
554
+	}
555
+
556
+	ubifs_msg(c, "Mounting in %sauthenticated mode",
557
+		  c->authenticated ? "" : "un");
558
+
559
+	if (!c->authenticated)
560
+		return 0;
561
+
562
+	if (!IS_ENABLED(CONFIG_UBIFS_FS_AUTHENTICATION))
563
+		return -EOPNOTSUPP;
564
+
565
+	hash_algo = le16_to_cpu(sup->hash_algo);
566
+	if (hash_algo >= HASH_ALGO__LAST) {
567
+		ubifs_err(c, "superblock uses unknown hash algo %d",
568
+			  hash_algo);
569
+		return -EINVAL;
570
+	}
571
+
572
+	if (strcmp(hash_algo_name[hash_algo], c->auth_hash_name)) {
573
+		ubifs_err(c, "This filesystem uses %s for hashing,"
574
+			     " but %s is specified", hash_algo_name[hash_algo],
575
+			     c->auth_hash_name);
576
+		return -EINVAL;
577
+	}
578
+
579
+	/*
580
+	 * The super block node can either be authenticated by a HMAC or
581
+	 * by a signature in a ubifs_sig_node directly following the
582
+	 * super block node to support offline image creation.
583
+	 */
584
+	if (ubifs_hmac_zero(c, sup->hmac)) {
585
+		err = ubifs_sb_verify_signature(c, sup);
586
+	} else {
587
+		err = ubifs_hmac_wkm(c, hmac_wkm);
588
+		if (err)
589
+			return err;
590
+		if (ubifs_check_hmac(c, hmac_wkm, sup->hmac_wkm)) {
591
+			ubifs_err(c, "provided key does not fit");
592
+			return -ENOKEY;
593
+		}
594
+		err = ubifs_node_verify_hmac(c, sup, sizeof(*sup),
595
+					     offsetof(struct ubifs_sb_node,
596
+						      hmac));
597
+	}
598
+
599
+	if (err)
600
+		ubifs_err(c, "Failed to authenticate superblock: %d", err);
601
+
602
+	return err;
603
+}
604
+
531605 /**
532606  * ubifs_write_sb_node - write superblock node.
533607  * @c: UBIFS file-system description object
....@@ -538,8 +612,13 @@
538612 int ubifs_write_sb_node(struct ubifs_info *c, struct ubifs_sb_node *sup)
539613 {
540614 	int len = ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size);
615
+	int err;
541616 
542
-	ubifs_prepare_node(c, sup, UBIFS_SB_NODE_SZ, 1);
617
+	err = ubifs_prepare_node_hmac(c, sup, UBIFS_SB_NODE_SZ,
618
+				      offsetof(struct ubifs_sb_node, hmac), 1);
619
+	if (err)
620
+		return err;
621
+
543622 	return ubifs_leb_change(c, UBIFS_SB_LNUM, sup, len);
544623 }
545624 
....@@ -565,6 +644,8 @@
565644 	sup = ubifs_read_sb_node(c);
566645 	if (IS_ERR(sup))
567646 		return PTR_ERR(sup);
647
+
648
+	c->sup_node = sup;
568649 
569650 	c->fmt_version = le32_to_cpu(sup->fmt_version);
570651 	c->ro_compat_version = le32_to_cpu(sup->ro_compat_version);
....@@ -614,7 +695,7 @@
614695 		c->key_hash = key_test_hash;
615696 		c->key_hash_type = UBIFS_KEY_HASH_TEST;
616697 		break;
617
-	};
698
+	}
618699 
619700 	c->key_fmt = sup->key_fmt;
620701 
....@@ -651,6 +732,10 @@
651732 	c->double_hash = !!(sup_flags & UBIFS_FLG_DOUBLE_HASH);
652733 	c->encrypted = !!(sup_flags & UBIFS_FLG_ENCRYPTION);
653734 
735
+	err = authenticate_sb_node(c, sup);
736
+	if (err)
737
+		goto out;
738
+
654739 	if ((sup_flags & ~UBIFS_FLG_MASK) != 0) {
655740 		ubifs_err(c, "Unknown feature flags found: %#x",
656741 			  sup_flags & ~UBIFS_FLG_MASK);
....@@ -658,31 +743,24 @@
658743 		goto out;
659744 	}
660745 
661
-#ifndef CONFIG_FS_ENCRYPTION
662
-	if (c->encrypted) {
746
+	if (!IS_ENABLED(CONFIG_FS_ENCRYPTION) && c->encrypted) {
663747 		ubifs_err(c, "file system contains encrypted files but UBIFS"
664748 			     " was built without crypto support.");
665749 		err = -EINVAL;
666750 		goto out;
667751 	}
668
-#endif
669752 
670753 	/* Automatically increase file system size to the maximum size */
671
-	c->old_leb_cnt = c->leb_cnt;
672754 	if (c->leb_cnt < c->vi.size && c->leb_cnt < c->max_leb_cnt) {
755
+		int old_leb_cnt = c->leb_cnt;
756
+
673757 		c->leb_cnt = min_t(int, c->max_leb_cnt, c->vi.size);
674
-		if (c->ro_mount)
675
-			dbg_mnt("Auto resizing (ro) from %d LEBs to %d LEBs",
676
-				c->old_leb_cnt,	c->leb_cnt);
677
-		else {
678
-			dbg_mnt("Auto resizing (sb) from %d LEBs to %d LEBs",
679
-				c->old_leb_cnt, c->leb_cnt);
680
-			sup->leb_cnt = cpu_to_le32(c->leb_cnt);
681
-			err = ubifs_write_sb_node(c, sup);
682
-			if (err)
683
-				goto out;
684
-			c->old_leb_cnt = c->leb_cnt;
685
-		}
758
+		sup->leb_cnt = cpu_to_le32(c->leb_cnt);
759
+
760
+		c->superblock_need_write = 1;
761
+
762
+		dbg_mnt("Auto resizing from %d LEBs to %d LEBs",
763
+			old_leb_cnt, c->leb_cnt);
686764 	}
687765 
688766 	c->log_bytes = (long long)c->log_lebs * c->leb_size;
....@@ -697,7 +775,6 @@
697775 
698776 	err = validate_sb(c, sup);
699777 out:
700
-	kfree(sup);
701778 	return err;
702779 }
703780 
....@@ -826,7 +903,7 @@
826903 int ubifs_fixup_free_space(struct ubifs_info *c)
827904 {
828905 	int err;
829
-	struct ubifs_sb_node *sup;
906
+	struct ubifs_sb_node *sup = c->sup_node;
830907 
831908 	ubifs_assert(c, c->space_fixup);
832909 	ubifs_assert(c, !c->ro_mount);
....@@ -837,18 +914,11 @@
837914 	if (err)
838915 		return err;
839916 
840
-	sup = ubifs_read_sb_node(c);
841
-	if (IS_ERR(sup))
842
-		return PTR_ERR(sup);
843
-
844917 	/* Free-space fixup is no longer required */
845918 	c->space_fixup = 0;
846919 	sup->flags &= cpu_to_le32(~UBIFS_FLG_SPACE_FIXUP);
847920 
848
-	err = ubifs_write_sb_node(c, sup);
849
-	kfree(sup);
850
-	if (err)
851
-		return err;
921
+	c->superblock_need_write = 1;
852922 
853923 	ubifs_msg(c, "free space fixup complete");
854924 	return err;
....@@ -857,7 +927,10 @@
857927 int ubifs_enable_encryption(struct ubifs_info *c)
858928 {
859929 	int err;
860
-	struct ubifs_sb_node *sup;
930
+	struct ubifs_sb_node *sup = c->sup_node;
931
+
932
+	if (!IS_ENABLED(CONFIG_FS_ENCRYPTION))
933
+		return -EOPNOTSUPP;
861934 
862935 	if (c->encrypted)
863936 		return 0;
....@@ -870,16 +943,11 @@
870943 		return -EINVAL;
871944 	}
872945 
873
-	sup = ubifs_read_sb_node(c);
874
-	if (IS_ERR(sup))
875
-		return PTR_ERR(sup);
876
-
877946 	sup->flags |= cpu_to_le32(UBIFS_FLG_ENCRYPTION);
878947 
879948 	err = ubifs_write_sb_node(c, sup);
880949 	if (!err)
881950 		c->encrypted = 1;
882
-	kfree(sup);
883951 
884952 	return err;
885953 }