add r8169 read mac form eeprom

hc

2024-02-19 1c055e55a242a33e574e48be530e06770a210dcd

 kernel/fs/tracefs/inode.c
..
..
@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /*
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3
  *  inode.c - part of tracefs, a pseudo file system for activating tracing
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4
  *
..
..
@@ -5,12 +6,7 @@
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6
  *
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  *  Copyright (C) 2014 Red Hat Inc, author: Steven Rostedt <srostedt@redhat.com>
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  *
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- *	This program is free software; you can redistribute it and/or
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- *	modify it under the terms of the GNU General Public License version
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- *	2 as published by the Free Software Foundation.
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- *
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9
  * tracefs is the file system that is used by the tracing infrastructure.
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- *
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10
  */
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11
 
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 #include <linux/module.h>
..
..
@@ -20,6 +16,7 @@
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 #include <linux/namei.h>
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17
 #include <linux/tracefs.h>
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 #include <linux/fsnotify.h>
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+#include <linux/security.h>
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 #include <linux/seq_file.h>
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21
 #include <linux/parser.h>
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22
 #include <linux/magic.h>
..
..
@@ -142,6 +139,8 @@
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 	kuid_t uid;
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 	kgid_t gid;
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 	umode_t mode;
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+	/* Opt_* bitfield. */
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+	unsigned int opts;
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 };
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145
 
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 enum {
..
..
@@ -199,7 +198,7 @@
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198
 
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 		if (!list_empty(&dentry->d_subdirs)) {
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 			spin_unlock(&this_parent->d_lock);
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-			spin_release(&dentry->d_lock.dep_map, 1, _RET_IP_);
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+			spin_release(&dentry->d_lock.dep_map, _RET_IP_);
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 			this_parent = dentry;
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 			spin_acquire(&this_parent->d_lock.dep_map, 0, 1, _RET_IP_);
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 			goto repeat;
..
..
@@ -242,6 +241,7 @@
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 	kgid_t gid;
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 	char *p;
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243
 
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+	opts->opts = 0;
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 	opts->mode = TRACEFS_DEFAULT_MODE;
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246
 
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 	while ((p = strsep(&data, ",")) != NULL) {
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..
@@ -276,24 +276,36 @@
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 		 * but traditionally tracefs has ignored all mount options
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 		 */
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 		}
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+
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+		opts->opts |= BIT(token);
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 	}
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282
 
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 	return 0;
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284
 }
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285
 
284
-static int tracefs_apply_options(struct super_block *sb)
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+static int tracefs_apply_options(struct super_block *sb, bool remount)
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 {
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 	struct tracefs_fs_info *fsi = sb->s_fs_info;
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 	struct inode *inode = sb->s_root->d_inode;
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 	struct tracefs_mount_opts *opts = &fsi->mount_opts;
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291
 
290
-	inode->i_mode &= ~S_IALLUGO;
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-	inode->i_mode |= opts->mode;
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+	/*
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+	 * On remount, only reset mode/uid/gid if they were provided as mount
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+	 * options.
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+	 */
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296
 
293
-	inode->i_uid = opts->uid;
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+	if (!remount || opts->opts & BIT(Opt_mode)) {
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+		inode->i_mode &= ~S_IALLUGO;
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+		inode->i_mode |= opts->mode;
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+	}
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301
 
295
-	/* Set all the group ids to the mount option */
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-	set_gid(sb->s_root, opts->gid);
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+	if (!remount || opts->opts & BIT(Opt_uid))
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+		inode->i_uid = opts->uid;
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+
305
+	if (!remount || opts->opts & BIT(Opt_gid)) {
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+		/* Set all the group ids to the mount option */
307
+		set_gid(sb->s_root, opts->gid);
308
+	}
297
309
 
298
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 	return 0;
299
311
 }
..
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@@ -308,7 +320,7 @@
308
320
 	if (err)
309
321
 		goto fail;
310
322
 
311
-	tracefs_apply_options(sb);
323
+	tracefs_apply_options(sb, true);
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324
 
313
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 fail:
314
326
 	return err;
..
..
@@ -360,7 +372,7 @@
360
372
 
361
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 	sb->s_op = &tracefs_super_operations;
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374
 
363
-	tracefs_apply_options(sb);
375
+	tracefs_apply_options(sb, false);
364
376
 
365
377
 	return 0;
366
378
 
..
..
@@ -406,7 +418,10 @@
406
418
 		parent = tracefs_mount->mnt_root;
407
419
 
408
420
 	inode_lock(parent->d_inode);
409
-	dentry = lookup_one_len(name, parent, strlen(name));
421
+	if (unlikely(IS_DEADDIR(parent->d_inode)))
422
+		dentry = ERR_PTR(-ENOENT);
423
+	else
424
+		dentry = lookup_one_len(name, parent, strlen(name));
410
425
 	if (!IS_ERR(dentry) && dentry->d_inode) {
411
426
 		dput(dentry);
412
427
 		dentry = ERR_PTR(-EEXIST);
..
..
@@ -466,6 +481,9 @@
466
481
 {
467
482
 	struct dentry *dentry;
468
483
 	struct inode *inode;
484
+
485
+	if (security_locked_down(LOCKDOWN_TRACEFS))
486
+		return NULL;
469
487
 
470
488
 	if (!(mode & S_IFMT))
471
489
 		mode |= S_IFREG;
..
..
@@ -535,6 +553,9 @@
535
553
  */
536
554
 struct dentry *tracefs_create_dir(const char *name, struct dentry *parent)
537
555
 {
556
+	if (security_locked_down(LOCKDOWN_TRACEFS))
557
+		return NULL;
558
+
538
559
 	return __create_dir(name, parent, &simple_dir_inode_operations);
539
560
 }
540
561
 
..
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@@ -576,119 +597,27 @@
576
597
 	return dentry;
577
598
 }
578
599
 
579
-static int __tracefs_remove(struct dentry *dentry, struct dentry *parent)
600
+static void remove_one(struct dentry *victim)
580
601
 {
581
-	int ret = 0;
582
-
583
-	if (simple_positive(dentry)) {
584
-		if (dentry->d_inode) {
585
-			dget(dentry);
586
-			switch (dentry->d_inode->i_mode & S_IFMT) {
587
-			case S_IFDIR:
588
-				ret = simple_rmdir(parent->d_inode, dentry);
589
-				break;
590
-			default:
591
-				simple_unlink(parent->d_inode, dentry);
592
-				break;
593
-			}
594
-			if (!ret)
595
-				d_delete(dentry);
596
-			dput(dentry);
597
-		}
598
-	}
599
-	return ret;
602
+	simple_release_fs(&tracefs_mount, &tracefs_mount_count);
600
603
 }
601
604
 
602
605
 /**
603
- * tracefs_remove - removes a file or directory from the tracefs filesystem
604
- * @dentry: a pointer to a the dentry of the file or directory to be
605
- *          removed.
606
- *
607
- * This function removes a file or directory in tracefs that was previously
608
- * created with a call to another tracefs function (like
609
- * tracefs_create_file() or variants thereof.)
610
- */
611
-void tracefs_remove(struct dentry *dentry)
612
-{
613
-	struct dentry *parent;
614
-	int ret;
615
-
616
-	if (IS_ERR_OR_NULL(dentry))
617
-		return;
618
-
619
-	parent = dentry->d_parent;
620
-	inode_lock(parent->d_inode);
621
-	ret = __tracefs_remove(dentry, parent);
622
-	inode_unlock(parent->d_inode);
623
-	if (!ret)
624
-		simple_release_fs(&tracefs_mount, &tracefs_mount_count);
625
-}
626
-
627
-/**
628
- * tracefs_remove_recursive - recursively removes a directory
606
+ * tracefs_remove - recursively removes a directory
629
607
  * @dentry: a pointer to a the dentry of the directory to be removed.
630
608
  *
631
609
  * This function recursively removes a directory tree in tracefs that
632
610
  * was previously created with a call to another tracefs function
633
611
  * (like tracefs_create_file() or variants thereof.)
634
612
  */
635
-void tracefs_remove_recursive(struct dentry *dentry)
613
+void tracefs_remove(struct dentry *dentry)
636
614
 {
637
-	struct dentry *child, *parent;
638
-
639
615
 	if (IS_ERR_OR_NULL(dentry))
640
616
 		return;
641
617
 
642
-	parent = dentry;
643
- down:
644
-	inode_lock(parent->d_inode);
645
- loop:
646
-	/*
647
-	 * The parent->d_subdirs is protected by the d_lock. Outside that
648
-	 * lock, the child can be unlinked and set to be freed which can
649
-	 * use the d_u.d_child as the rcu head and corrupt this list.
650
-	 */
651
-	spin_lock(&parent->d_lock);
652
-	list_for_each_entry(child, &parent->d_subdirs, d_child) {
653
-		if (!simple_positive(child))
654
-			continue;
655
-
656
-		/* perhaps simple_empty(child) makes more sense */
657
-		if (!list_empty(&child->d_subdirs)) {
658
-			spin_unlock(&parent->d_lock);
659
-			inode_unlock(parent->d_inode);
660
-			parent = child;
661
-			goto down;
662
-		}
663
-
664
-		spin_unlock(&parent->d_lock);
665
-
666
-		if (!__tracefs_remove(child, parent))
667
-			simple_release_fs(&tracefs_mount, &tracefs_mount_count);
668
-
669
-		/*
670
-		 * The parent->d_lock protects agaist child from unlinking
671
-		 * from d_subdirs. When releasing the parent->d_lock we can
672
-		 * no longer trust that the next pointer is valid.
673
-		 * Restart the loop. We'll skip this one with the
674
-		 * simple_positive() check.
675
-		 */
676
-		goto loop;
677
-	}
678
-	spin_unlock(&parent->d_lock);
679
-
680
-	inode_unlock(parent->d_inode);
681
-	child = parent;
682
-	parent = parent->d_parent;
683
-	inode_lock(parent->d_inode);
684
-
685
-	if (child != dentry)
686
-		/* go up */
687
-		goto loop;
688
-
689
-	if (!__tracefs_remove(child, parent))
690
-		simple_release_fs(&tracefs_mount, &tracefs_mount_count);
691
-	inode_unlock(parent->d_inode);
618
+	simple_pin_fs(&trace_fs_type, &tracefs_mount, &tracefs_mount_count);
619
+	simple_recursive_removal(dentry, remove_one);
620
+	simple_release_fs(&tracefs_mount, &tracefs_mount_count);
692
621
 }
693
622
 
694
623
 /**