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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/drivers/acpi/tables.c
....@@ -1,22 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  *  acpi_tables.c - ACPI Boot-Time Table Parsing
34  *
45  *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
5
- *
6
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7
- *
8
- *  This program is free software; you can redistribute it and/or modify
9
- *  it under the terms of the GNU General Public License as published by
10
- *  the Free Software Foundation; either version 2 of the License, or
11
- *  (at your option) any later version.
12
- *
13
- *  This program is distributed in the hope that it will be useful,
14
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16
- *  GNU General Public License for more details.
17
- *
18
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
19
- *
206  */
217 
228 /* Uncomment next line to get verbose printout */
....@@ -31,10 +17,10 @@
3117 #include <linux/irq.h>
3218 #include <linux/errno.h>
3319 #include <linux/acpi.h>
34
-#include <linux/bootmem.h>
35
-#include <linux/earlycpio.h>
3620 #include <linux/memblock.h>
21
+#include <linux/earlycpio.h>
3722 #include <linux/initrd.h>
23
+#include <linux/security.h>
3824 #include "internal.h"
3925 
4026 #ifdef CONFIG_ACPI_CUSTOM_DSDT
....@@ -49,6 +35,16 @@
4935 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
5036 
5137 static int acpi_apic_instance __initdata;
38
+
39
+enum acpi_subtable_type {
40
+	ACPI_SUBTABLE_COMMON,
41
+	ACPI_SUBTABLE_HMAT,
42
+};
43
+
44
+struct acpi_subtable_entry {
45
+	union acpi_subtable_headers *hdr;
46
+	enum acpi_subtable_type type;
47
+};
5248 
5349 /*
5450  * Disable table checksum verification for the early stage due to the size
....@@ -218,6 +214,50 @@
218214 	}
219215 }
220216 
217
+static unsigned long __init
218
+acpi_get_entry_type(struct acpi_subtable_entry *entry)
219
+{
220
+	switch (entry->type) {
221
+	case ACPI_SUBTABLE_COMMON:
222
+		return entry->hdr->common.type;
223
+	case ACPI_SUBTABLE_HMAT:
224
+		return entry->hdr->hmat.type;
225
+	}
226
+	return 0;
227
+}
228
+
229
+static unsigned long __init
230
+acpi_get_entry_length(struct acpi_subtable_entry *entry)
231
+{
232
+	switch (entry->type) {
233
+	case ACPI_SUBTABLE_COMMON:
234
+		return entry->hdr->common.length;
235
+	case ACPI_SUBTABLE_HMAT:
236
+		return entry->hdr->hmat.length;
237
+	}
238
+	return 0;
239
+}
240
+
241
+static unsigned long __init
242
+acpi_get_subtable_header_length(struct acpi_subtable_entry *entry)
243
+{
244
+	switch (entry->type) {
245
+	case ACPI_SUBTABLE_COMMON:
246
+		return sizeof(entry->hdr->common);
247
+	case ACPI_SUBTABLE_HMAT:
248
+		return sizeof(entry->hdr->hmat);
249
+	}
250
+	return 0;
251
+}
252
+
253
+static enum acpi_subtable_type __init
254
+acpi_get_subtable_type(char *id)
255
+{
256
+	if (strncmp(id, ACPI_SIG_HMAT, 4) == 0)
257
+		return ACPI_SUBTABLE_HMAT;
258
+	return ACPI_SUBTABLE_COMMON;
259
+}
260
+
221261 /**
222262  * acpi_parse_entries_array - for each proc_num find a suitable subtable
223263  *
....@@ -241,49 +281,35 @@
241281  * On success returns sum of all matching entries for all proc handlers.
242282  * Otherwise, -ENODEV or -EINVAL is returned.
243283  */
244
-static int __init
245
-acpi_parse_entries_array(char *id, unsigned long table_size,
284
+static int __init acpi_parse_entries_array(char *id, unsigned long table_size,
246285 		struct acpi_table_header *table_header,
247286 		struct acpi_subtable_proc *proc, int proc_num,
248287 		unsigned int max_entries)
249288 {
250
-	struct acpi_subtable_header *entry;
251
-	unsigned long table_end;
289
+	struct acpi_subtable_entry entry;
290
+	unsigned long table_end, subtable_len, entry_len;
252291 	int count = 0;
253292 	int errs = 0;
254293 	int i;
255
-
256
-	if (acpi_disabled)
257
-		return -ENODEV;
258
-
259
-	if (!id)
260
-		return -EINVAL;
261
-
262
-	if (!table_size)
263
-		return -EINVAL;
264
-
265
-	if (!table_header) {
266
-		pr_warn("%4.4s not present\n", id);
267
-		return -ENODEV;
268
-	}
269294 
270295 	table_end = (unsigned long)table_header + table_header->length;
271296 
272297 	/* Parse all entries looking for a match. */
273298 
274
-	entry = (struct acpi_subtable_header *)
299
+	entry.type = acpi_get_subtable_type(id);
300
+	entry.hdr = (union acpi_subtable_headers *)
275301 	    ((unsigned long)table_header + table_size);
302
+	subtable_len = acpi_get_subtable_header_length(&entry);
276303 
277
-	while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
278
-	       table_end) {
304
+	while (((unsigned long)entry.hdr) + subtable_len  < table_end) {
279305 		if (max_entries && count >= max_entries)
280306 			break;
281307 
282308 		for (i = 0; i < proc_num; i++) {
283
-			if (entry->type != proc[i].id)
309
+			if (acpi_get_entry_type(&entry) != proc[i].id)
284310 				continue;
285311 			if (!proc[i].handler ||
286
-			     (!errs && proc[i].handler(entry, table_end))) {
312
+			     (!errs && proc[i].handler(entry.hdr, table_end))) {
287313 				errs++;
288314 				continue;
289315 			}
....@@ -298,13 +324,14 @@
298324 		 * If entry->length is 0, break from this loop to avoid
299325 		 * infinite loop.
300326 		 */
301
-		if (entry->length == 0) {
327
+		entry_len = acpi_get_entry_length(&entry);
328
+		if (entry_len == 0) {
302329 			pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
303330 			return -EINVAL;
304331 		}
305332 
306
-		entry = (struct acpi_subtable_header *)
307
-		    ((unsigned long)entry + entry->length);
333
+		entry.hdr = (union acpi_subtable_headers *)
334
+		    ((unsigned long)entry.hdr + entry_len);
308335 	}
309336 
310337 	if (max_entries && count > max_entries) {
....@@ -315,8 +342,7 @@
315342 	return errs ? -EINVAL : count;
316343 }
317344 
318
-int __init
319
-acpi_table_parse_entries_array(char *id,
345
+int __init acpi_table_parse_entries_array(char *id,
320346 			 unsigned long table_size,
321347 			 struct acpi_subtable_proc *proc, int proc_num,
322348 			 unsigned int max_entries)
....@@ -329,6 +355,9 @@
329355 		return -ENODEV;
330356 
331357 	if (!id)
358
+		return -EINVAL;
359
+
360
+	if (!table_size)
332361 		return -EINVAL;
333362 
334363 	if (!strncmp(id, ACPI_SIG_MADT, 4))
....@@ -347,8 +376,7 @@
347376 	return count;
348377 }
349378 
350
-int __init
351
-acpi_table_parse_entries(char *id,
379
+int __init acpi_table_parse_entries(char *id,
352380 			unsigned long table_size,
353381 			int entry_id,
354382 			acpi_tbl_entry_handler handler,
....@@ -363,8 +391,7 @@
363391 						max_entries);
364392 }
365393 
366
-int __init
367
-acpi_table_parse_madt(enum acpi_madt_type id,
394
+int __init acpi_table_parse_madt(enum acpi_madt_type id,
368395 		      acpi_tbl_entry_handler handler, unsigned int max_entries)
369396 {
370397 	return acpi_table_parse_entries(ACPI_SIG_MADT,
....@@ -452,17 +479,18 @@
452479 }
453480 
454481 /* All but ACPI_SIG_RSDP and ACPI_SIG_FACS: */
455
-static const char * const table_sigs[] = {
456
-	ACPI_SIG_BERT, ACPI_SIG_CPEP, ACPI_SIG_ECDT, ACPI_SIG_EINJ,
457
-	ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT, ACPI_SIG_MSCT,
458
-	ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT, ACPI_SIG_ASF,
459
-	ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR, ACPI_SIG_HPET,
460
-	ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG, ACPI_SIG_MCHI,
461
-	ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI, ACPI_SIG_TCPA,
462
-	ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT, ACPI_SIG_WDDT,
463
-	ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT, ACPI_SIG_PSDT,
464
-	ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT, ACPI_SIG_IORT,
465
-	ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT, NULL };
482
+static const char table_sigs[][ACPI_NAMESEG_SIZE] __initconst = {
483
+	ACPI_SIG_BERT, ACPI_SIG_BGRT, ACPI_SIG_CPEP, ACPI_SIG_ECDT,
484
+	ACPI_SIG_EINJ, ACPI_SIG_ERST, ACPI_SIG_HEST, ACPI_SIG_MADT,
485
+	ACPI_SIG_MSCT, ACPI_SIG_SBST, ACPI_SIG_SLIT, ACPI_SIG_SRAT,
486
+	ACPI_SIG_ASF,  ACPI_SIG_BOOT, ACPI_SIG_DBGP, ACPI_SIG_DMAR,
487
+	ACPI_SIG_HPET, ACPI_SIG_IBFT, ACPI_SIG_IVRS, ACPI_SIG_MCFG,
488
+	ACPI_SIG_MCHI, ACPI_SIG_SLIC, ACPI_SIG_SPCR, ACPI_SIG_SPMI,
489
+	ACPI_SIG_TCPA, ACPI_SIG_UEFI, ACPI_SIG_WAET, ACPI_SIG_WDAT,
490
+	ACPI_SIG_WDDT, ACPI_SIG_WDRT, ACPI_SIG_DSDT, ACPI_SIG_FADT,
491
+	ACPI_SIG_PSDT, ACPI_SIG_RSDT, ACPI_SIG_XSDT, ACPI_SIG_SSDT,
492
+	ACPI_SIG_IORT, ACPI_SIG_NFIT, ACPI_SIG_HMAT, ACPI_SIG_PPTT,
493
+	ACPI_SIG_NHLT };
466494 
467495 #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header)
468496 
....@@ -474,13 +502,21 @@
474502 
475503 void __init acpi_table_upgrade(void)
476504 {
477
-	void *data = (void *)initrd_start;
478
-	size_t size = initrd_end - initrd_start;
505
+	void *data;
506
+	size_t size;
479507 	int sig, no, table_nr = 0, total_offset = 0;
480508 	long offset = 0;
481509 	struct acpi_table_header *table;
482510 	char cpio_path[32] = "kernel/firmware/acpi/";
483511 	struct cpio_data file;
512
+
513
+	if (IS_ENABLED(CONFIG_ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD)) {
514
+		data = __initramfs_start;
515
+		size = __initramfs_size;
516
+	} else {
517
+		data = (void *)initrd_start;
518
+		size = initrd_end - initrd_start;
519
+	}
484520 
485521 	if (data == NULL || size == 0)
486522 		return;
....@@ -501,11 +537,11 @@
501537 
502538 		table = file.data;
503539 
504
-		for (sig = 0; table_sigs[sig]; sig++)
540
+		for (sig = 0; sig < ARRAY_SIZE(table_sigs); sig++)
505541 			if (!memcmp(table->signature, table_sigs[sig], 4))
506542 				break;
507543 
508
-		if (!table_sigs[sig]) {
544
+		if (sig >= ARRAY_SIZE(table_sigs)) {
509545 			pr_err("ACPI OVERRIDE: Unknown signature [%s%s]\n",
510546 				cpio_path, file.name);
511547 			continue;
....@@ -531,6 +567,11 @@
531567 	}
532568 	if (table_nr == 0)
533569 		return;
570
+
571
+	if (security_locked_down(LOCKDOWN_ACPI_TABLES)) {
572
+		pr_notice("kernel is locked down, ignoring table override\n");
573
+		return;
574
+	}
534575 
535576 	acpi_tables_addr =
536577 		memblock_find_in_range(0, ACPI_TABLE_UPGRADE_MAX_PHYS,
....@@ -663,8 +704,8 @@
663704 		table_length = table->length;
664705 
665706 		/* Skip RSDT/XSDT which should only be used for override */
666
-		if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_RSDT) ||
667
-		    ACPI_COMPARE_NAME(table->signature, ACPI_SIG_XSDT)) {
707
+		if (ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_RSDT) ||
708
+		    ACPI_COMPARE_NAMESEG(table->signature, ACPI_SIG_XSDT)) {
668709 			acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
669710 			goto next_table;
670711 		}
....@@ -713,8 +754,12 @@
713754 					  table_length);
714755 }
715756 
716
-acpi_status
717
-acpi_os_table_override(struct acpi_table_header *existing_table,
757
+#ifdef CONFIG_ACPI_CUSTOM_DSDT
758
+static void *amlcode __attribute__ ((weakref("AmlCode")));
759
+static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
760
+#endif
761
+
762
+acpi_status acpi_os_table_override(struct acpi_table_header *existing_table,
718763 		       struct acpi_table_header **new_table)
719764 {
720765 	if (!existing_table || !new_table)
....@@ -723,8 +768,11 @@
723768 	*new_table = NULL;
724769 
725770 #ifdef CONFIG_ACPI_CUSTOM_DSDT
726
-	if (strncmp(existing_table->signature, "DSDT", 4) == 0)
727
-		*new_table = (struct acpi_table_header *)AmlCode;
771
+	if (!strncmp(existing_table->signature, "DSDT", 4)) {
772
+		*new_table = (struct acpi_table_header *)&amlcode;
773
+		if (!(*new_table))
774
+			*new_table = (struct acpi_table_header *)&dsdt_amlcode;
775
+	}
728776 #endif
729777 	if (*new_table != NULL)
730778 		acpi_table_taint(existing_table);
....@@ -809,7 +857,6 @@
809857 
810858 	return 0;
811859 }
812
-
813860 early_param("acpi_apic_instance", acpi_parse_apic_instance);
814861 
815862 static int __init acpi_force_table_verification_setup(char *s)
....@@ -818,7 +865,6 @@
818865 
819866 	return 0;
820867 }
821
-
822868 early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
823869 
824870 static int __init acpi_force_32bit_fadt_addr(char *s)
....@@ -828,5 +874,4 @@
828874 
829875 	return 0;
830876 }
831
-
832877 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);