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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/drivers/firmware/efi/efivars.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0+
12 /*
23  * Originally from efivars.c,
34  *
....@@ -6,63 +7,6 @@
67  *
78  * This code takes all variables accessible from EFI runtime and
89  *  exports them via sysfs
9
- *
10
- *  This program is free software; you can redistribute it and/or modify
11
- *  it under the terms of the GNU General Public License as published by
12
- *  the Free Software Foundation; either version 2 of the License, or
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- *  (at your option) any later version.
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- *
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- *  This program is distributed in the hope that it will be useful,
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- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- *  GNU General Public License for more details.
19
- *
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- *  You should have received a copy of the GNU General Public License
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- *  along with this program; if not, write to the Free Software
22
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
23
- *
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- * Changelog:
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- *
26
- *  17 May 2004 - Matt Domsch <Matt_Domsch@dell.com>
27
- *   remove check for efi_enabled in exit
28
- *   add MODULE_VERSION
29
- *
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- *  26 Apr 2004 - Matt Domsch <Matt_Domsch@dell.com>
31
- *   minor bug fixes
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- *
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- *  21 Apr 2004 - Matt Tolentino <matthew.e.tolentino@intel.com)
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- *   converted driver to export variable information via sysfs
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- *   and moved to drivers/firmware directory
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- *   bumped revision number to v0.07 to reflect conversion & move
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- *
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- *  10 Dec 2002 - Matt Domsch <Matt_Domsch@dell.com>
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- *   fix locking per Peter Chubb's findings
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- *
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- *  25 Mar 2002 - Matt Domsch <Matt_Domsch@dell.com>
42
- *   move uuid_unparse() to include/asm-ia64/efi.h:efi_guid_to_str()
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- *
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- *  12 Feb 2002 - Matt Domsch <Matt_Domsch@dell.com>
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- *   use list_for_each_safe when deleting vars.
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- *   remove ifdef CONFIG_SMP around include <linux/smp.h>
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- *   v0.04 release to linux-ia64@linuxia64.org
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- *
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- *  20 April 2001 - Matt Domsch <Matt_Domsch@dell.com>
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- *   Moved vars from /proc/efi to /proc/efi/vars, and made
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- *   efi.c own the /proc/efi directory.
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- *   v0.03 release to linux-ia64@linuxia64.org
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- *
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- *  26 March 2001 - Matt Domsch <Matt_Domsch@dell.com>
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- *   At the request of Stephane, moved ownership of /proc/efi
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- *   to efi.c, and now efivars lives under /proc/efi/vars.
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- *
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- *  12 March 2001 - Matt Domsch <Matt_Domsch@dell.com>
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- *   Feedback received from Stephane Eranian incorporated.
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- *   efivar_write() checks copy_from_user() return value.
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- *   efivar_read/write() returns proper errno.
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- *   v0.02 release to linux-ia64@linuxia64.org
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- *
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- *  26 February 2001 - Matt Domsch <Matt_Domsch@dell.com>
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- *   v0.01 release to linux-ia64@linuxia64.org
6610  */
6711 
6812 #include <linux/efi.h>
....@@ -78,10 +22,8 @@
7822 MODULE_DESCRIPTION("sysfs interface to EFI Variables");
7923 MODULE_LICENSE("GPL");
8024 MODULE_VERSION(EFIVARS_VERSION);
81
-MODULE_ALIAS("platform:efivars");
8225 
83
-LIST_HEAD(efivar_sysfs_list);
84
-EXPORT_SYMBOL_GPL(efivar_sysfs_list);
26
+static LIST_HEAD(efivar_sysfs_list);
8527 
8628 static struct kset *efivars_kset;
8729 
....@@ -238,14 +180,6 @@
238180 	return 0;
239181 }
240182 
241
-static inline bool is_compat(void)
242
-{
243
-	if (IS_ENABLED(CONFIG_COMPAT) && in_compat_syscall())
244
-		return true;
245
-
246
-	return false;
247
-}
248
-
249183 static void
250184 copy_out_compat(struct efi_variable *dst, struct compat_efi_variable *src)
251185 {
....@@ -275,7 +209,7 @@
275209 	if (!entry || !buf)
276210 		return -EINVAL;
277211 
278
-	if (is_compat()) {
212
+	if (in_compat_syscall()) {
279213 		struct compat_efi_variable *compat;
280214 
281215 		if (count != sizeof(*compat))
....@@ -338,7 +272,7 @@
338272 	if (ret)
339273 		return -EIO;
340274 
341
-	if (is_compat()) {
275
+	if (in_compat_syscall()) {
342276 		compat = (struct compat_efi_variable *)buf;
343277 
344278 		size = sizeof(*compat);
....@@ -432,7 +366,7 @@
432366 	struct compat_efi_variable *compat = (struct compat_efi_variable *)buf;
433367 	struct efi_variable *new_var = (struct efi_variable *)buf;
434368 	struct efivar_entry *new_entry;
435
-	bool need_compat = is_compat();
369
+	bool need_compat = in_compat_syscall();
436370 	efi_char16_t *name;
437371 	unsigned long size;
438372 	u32 attributes;
....@@ -509,7 +443,7 @@
509443 	if (!capable(CAP_SYS_ADMIN))
510444 		return -EACCES;
511445 
512
-	if (is_compat()) {
446
+	if (in_compat_syscall()) {
513447 		if (count != sizeof(*compat))
514448 			return -EINVAL;
515449 
....@@ -655,42 +589,6 @@
655589 	return error;
656590 }
657591 
658
-static int efivar_update_sysfs_entry(efi_char16_t *name, efi_guid_t vendor,
659
-				     unsigned long name_size, void *data)
660
-{
661
-	struct efivar_entry *entry = data;
662
-
663
-	if (efivar_entry_find(name, vendor, &efivar_sysfs_list, false))
664
-		return 0;
665
-
666
-	memcpy(entry->var.VariableName, name, name_size);
667
-	memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t));
668
-
669
-	return 1;
670
-}
671
-
672
-static void efivar_update_sysfs_entries(struct work_struct *work)
673
-{
674
-	struct efivar_entry *entry;
675
-	int err;
676
-
677
-	/* Add new sysfs entries */
678
-	while (1) {
679
-		entry = kzalloc(sizeof(*entry), GFP_KERNEL);
680
-		if (!entry)
681
-			return;
682
-
683
-		err = efivar_init(efivar_update_sysfs_entry, entry,
684
-				  false, &efivar_sysfs_list);
685
-		if (!err)
686
-			break;
687
-
688
-		efivar_create_sysfs_entry(entry);
689
-	}
690
-
691
-	kfree(entry);
692
-}
693
-
694592 static int efivars_sysfs_callback(efi_char16_t *name, efi_guid_t vendor,
695593 				  unsigned long name_size, void *data)
696594 {
....@@ -739,16 +637,13 @@
739637 	kset_unregister(efivars_kset);
740638 }
741639 
742
-int efivars_sysfs_init(void)
640
+static int efivars_sysfs_init(void)
743641 {
744642 	struct kobject *parent_kobj = efivars_kobject();
745643 	int error = 0;
746644 
747
-	if (!efi_enabled(EFI_RUNTIME_SERVICES))
748
-		return -ENODEV;
749
-
750645 	/* No efivars has been registered yet */
751
-	if (!parent_kobj)
646
+	if (!parent_kobj || !efivar_supports_writes())
752647 		return 0;
753648 
754649 	printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION,
....@@ -768,11 +663,8 @@
768663 		return error;
769664 	}
770665 
771
-	INIT_WORK(&efivar_work, efivar_update_sysfs_entries);
772
-
773666 	return 0;
774667 }
775
-EXPORT_SYMBOL_GPL(efivars_sysfs_init);
776668 
777669 module_init(efivars_sysfs_init);
778670 module_exit(efivars_sysfs_exit);