summaryrefslogtreecommitdiff
path: root/drivers/acpi/acpica/nsprepkg.c
blob: fde5a09819e013793c8f85bb7dd3079703bf7069 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
/******************************************************************************
 *
 * Module Name: nsprepkg - Validation of package objects for predefined names
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2016, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "acpredef.h"

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nsprepkg")

/* Local prototypes */
static acpi_status
acpi_ns_check_package_list(struct acpi_evaluate_info *info,
			   const union acpi_predefined_info *package,
			   union acpi_operand_object **elements, u32 count);

static acpi_status
acpi_ns_check_package_elements(struct acpi_evaluate_info *info,
			       union acpi_operand_object **elements,
			       u8 type1,
			       u32 count1,
			       u8 type2, u32 count2, u32 start_index);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_check_package
 *
 * PARAMETERS:  info                - Method execution information block
 *              return_object_ptr   - Pointer to the object returned from the
 *                                    evaluation of a method or object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Check a returned package object for the correct count and
 *              correct type of all sub-objects.
 *
 ******************************************************************************/

acpi_status
acpi_ns_check_package(struct acpi_evaluate_info *info,
		      union acpi_operand_object **return_object_ptr)
{
	union acpi_operand_object *return_object = *return_object_ptr;
	const union acpi_predefined_info *package;
	union acpi_operand_object **elements;
	acpi_status status = AE_OK;
	u32 expected_count;
	u32 count;
	u32 i;

	ACPI_FUNCTION_NAME(ns_check_package);

	/* The package info for this name is in the next table entry */

	package = info->predefined + 1;

	ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
			  "%s Validating return Package of Type %X, Count %X\n",
			  info->full_pathname, package->ret_info.type,
			  return_object->package.count));

	/*
	 * For variable-length Packages, we can safely remove all embedded
	 * and trailing NULL package elements
	 */
	acpi_ns_remove_null_elements(info, package->ret_info.type,
				     return_object);

	/* Extract package count and elements array */

	elements = return_object->package.elements;
	count = return_object->package.count;

	/*
	 * Most packages must have at least one element. The only exception
	 * is the variable-length package (ACPI_PTYPE1_VAR).
	 */
	if (!count) {
		if (package->ret_info.type == ACPI_PTYPE1_VAR) {
			return (AE_OK);
		}

		ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
				      info->node_flags,
				      "Return Package has no elements (empty)"));

		return (AE_AML_OPERAND_VALUE);
	}

	/*
	 * Decode the type of the expected package contents
	 *
	 * PTYPE1 packages contain no subpackages
	 * PTYPE2 packages contain subpackages
	 */
	switch (package->ret_info.type) {
	case ACPI_PTYPE1_FIXED:
		/*
		 * The package count is fixed and there are no subpackages
		 *
		 * If package is too small, exit.
		 * If package is larger than expected, issue warning but continue
		 */
		expected_count =
		    package->ret_info.count1 + package->ret_info.count2;
		if (count < expected_count) {
			goto package_too_small;
		} else if (count > expected_count) {
			ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
					  "%s: Return Package is larger than needed - "
					  "found %u, expected %u\n",
					  info->full_pathname, count,
					  expected_count));
		}

		/* Validate all elements of the returned package */

		status = acpi_ns_check_package_elements(info, elements,
							package->ret_info.
							object_type1,
							package->ret_info.
							count1,
							package->ret_info.
							object_type2,
							package->ret_info.
							count2, 0);
		break;

	case ACPI_PTYPE1_VAR:
		/*
		 * The package count is variable, there are no subpackages, and all
		 * elements must be of the same type
		 */
		for (i = 0; i < count; i++) {
			status = acpi_ns_check_object_type(info, elements,
							   package->ret_info.
							   object_type1, i);
			if (ACPI_FAILURE(status)) {
				return (status);
			}

			elements++;
		}
		break;

	case ACPI_PTYPE1_OPTION:
		/*
		 * The package count is variable, there are no subpackages. There are
		 * a fixed number of required elements, and a variable number of
		 * optional elements.
		 *
		 * Check if package is at least as large as the minimum required
		 */
		expected_count = package->ret_info3.count;
		if (count < expected_count) {
			goto package_too_small;
		}

		/* Variable number of sub-objects */

		for (i = 0; i < count; i++) {
			if (i < package->ret_info3.count) {

				/* These are the required package elements (0, 1, or 2) */

				status =
				    acpi_ns_check_object_type(info, elements,
							      package->
							      ret_info3.
							      object_type[i],
							      i);
				if (ACPI_FAILURE(status)) {
					return (status);
				}
			} else {
				/* These are the optional package elements */

				status =
				    acpi_ns_check_object_type(info, elements,
							      package->
							      ret_info3.
							      tail_object_type,
							      i);
				if (ACPI_FAILURE(status)) {
					return (status);
				}
			}

			elements++;
		}
		break;

	case ACPI_PTYPE2_REV_FIXED:

		/* First element is the (Integer) revision */

		status =
		    acpi_ns_check_object_type(info, elements,
					      ACPI_RTYPE_INTEGER, 0);
		if (ACPI_FAILURE(status)) {
			return (status);
		}

		elements++;
		count--;

		/* Examine the subpackages */

		status =
		    acpi_ns_check_package_list(info, package, elements, count);
		break;

	case ACPI_PTYPE2_PKG_COUNT:

		/* First element is the (Integer) count of subpackages to follow */

		status =
		    acpi_ns_check_object_type(info, elements,
					      ACPI_RTYPE_INTEGER, 0);
		if (ACPI_FAILURE(status)) {
			return (status);
		}

		/*
		 * Count cannot be larger than the parent package length, but allow it
		 * to be smaller. The >= accounts for the Integer above.
		 */
		expected_count = (u32)(*elements)->integer.value;
		if (expected_count >= count) {
			goto package_too_small;
		}

		count = expected_count;
		elements++;

		/* Examine the subpackages */

		status =
		    acpi_ns_check_package_list(info, package, elements, count);
		break;

	case ACPI_PTYPE2:
	case ACPI_PTYPE2_FIXED:
	case ACPI_PTYPE2_MIN:
	case ACPI_PTYPE2_COUNT:
	case ACPI_PTYPE2_FIX_VAR:
		/*
		 * These types all return a single Package that consists of a
		 * variable number of subpackages.
		 *
		 * First, ensure that the first element is a subpackage. If not,
		 * the BIOS may have incorrectly returned the object as a single
		 * package instead of a Package of Packages (a common error if
		 * there is only one entry). We may be able to repair this by
		 * wrapping the returned Package with a new outer Package.
		 */
		if (*elements
		    && ((*elements)->common.type != ACPI_TYPE_PACKAGE)) {

			/* Create the new outer package and populate it */

			status =
			    acpi_ns_wrap_with_package(info, return_object,
						      return_object_ptr);
			if (ACPI_FAILURE(status)) {
				return (status);
			}

			/* Update locals to point to the new package (of 1 element) */

			return_object = *return_object_ptr;
			elements = return_object->package.elements;
			count = 1;
		}

		/* Examine the subpackages */

		status =
		    acpi_ns_check_package_list(info, package, elements, count);
		break;

	case ACPI_PTYPE2_VAR_VAR:
		/*
		 * Returns a variable list of packages, each with a variable list
		 * of objects.
		 */
		break;

	case ACPI_PTYPE2_UUID_PAIR:

		/* The package must contain pairs of (UUID + type) */

		if (count & 1) {
			expected_count = count + 1;
			goto package_too_small;
		}

		while (count > 0) {
			status = acpi_ns_check_object_type(info, elements,
							   package->ret_info.
							   object_type1, 0);
			if (ACPI_FAILURE(status)) {
				return (status);
			}

			/* Validate length of the UUID buffer */

			if ((*elements)->buffer.length != 16) {
				ACPI_WARN_PREDEFINED((AE_INFO,
						      info->full_pathname,
						      info->node_flags,
						      "Invalid length for UUID Buffer"));
				return (AE_AML_OPERAND_VALUE);
			}

			status = acpi_ns_check_object_type(info, elements + 1,
							   package->ret_info.
							   object_type2, 0);
			if (ACPI_FAILURE(status)) {
				return (status);
			}

			elements += 2;
			count -= 2;
		}
		break;

	default:

		/* Should not get here if predefined info table is correct */

		ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
				      info->node_flags,
				      "Invalid internal return type in table entry: %X",
				      package->ret_info.type));

		return (AE_AML_INTERNAL);
	}

	return (status);

package_too_small:

	/* Error exit for the case with an incorrect package count */

	ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags,
			      "Return Package is too small - found %u elements, expected %u",
			      count, expected_count));

	return (AE_AML_OPERAND_VALUE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_check_package_list
 *
 * PARAMETERS:  info            - Method execution information block
 *              package         - Pointer to package-specific info for method
 *              elements        - Element list of parent package. All elements
 *                                of this list should be of type Package.
 *              count           - Count of subpackages
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Examine a list of subpackages
 *
 ******************************************************************************/

static acpi_status
acpi_ns_check_package_list(struct acpi_evaluate_info *info,
			   const union acpi_predefined_info *package,
			   union acpi_operand_object **elements, u32 count)
{
	union acpi_operand_object *sub_package;
	union acpi_operand_object **sub_elements;
	acpi_status status;
	u32 expected_count;
	u32 i;
	u32 j;

	/*
	 * Validate each subpackage in the parent Package
	 *
	 * NOTE: assumes list of subpackages contains no NULL elements.
	 * Any NULL elements should have been removed by earlier call
	 * to acpi_ns_remove_null_elements.
	 */
	for (i = 0; i < count; i++) {
		sub_package = *elements;
		sub_elements = sub_package->package.elements;
		info->parent_package = sub_package;

		/* Each sub-object must be of type Package */

		status = acpi_ns_check_object_type(info, &sub_package,
						   ACPI_RTYPE_PACKAGE, i);
		if (ACPI_FAILURE(status)) {
			return (status);
		}

		/* Examine the different types of expected subpackages */

		info->parent_package = sub_package;
		switch (package->ret_info.type) {
		case ACPI_PTYPE2:
		case ACPI_PTYPE2_PKG_COUNT:
		case ACPI_PTYPE2_REV_FIXED:

			/* Each subpackage has a fixed number of elements */

			expected_count =
			    package->ret_info.count1 + package->ret_info.count2;
			if (sub_package->package.count < expected_count) {
				goto package_too_small;
			}

			status =
			    acpi_ns_check_package_elements(info, sub_elements,
							   package->ret_info.
							   object_type1,
							   package->ret_info.
							   count1,
							   package->ret_info.
							   object_type2,
							   package->ret_info.
							   count2, 0);
			if (ACPI_FAILURE(status)) {
				return (status);
			}
			break;

		case ACPI_PTYPE2_FIX_VAR:
			/*
			 * Each subpackage has a fixed number of elements and an
			 * optional element
			 */
			expected_count =
			    package->ret_info.count1 + package->ret_info.count2;
			if (sub_package->package.count < expected_count) {
				goto package_too_small;
			}

			status =
			    acpi_ns_check_package_elements(info, sub_elements,
							   package->ret_info.
							   object_type1,
							   package->ret_info.
							   count1,
							   package->ret_info.
							   object_type2,
							   sub_package->package.
							   count -
							   package->ret_info.
							   count1, 0);
			if (ACPI_FAILURE(status)) {
				return (status);
			}
			break;

		case ACPI_PTYPE2_VAR_VAR:
			/*
			 * Each subpackage has a fixed or variable number of elements
			 */
			break;

		case ACPI_PTYPE2_FIXED:

			/* Each subpackage has a fixed length */

			expected_count = package->ret_info2.count;
			if (sub_package->package.count < expected_count) {
				goto package_too_small;
			}

			/* Check the type of each subpackage element */

			for (j = 0; j < expected_count; j++) {
				status =
				    acpi_ns_check_object_type(info,
							      &sub_elements[j],
							      package->
							      ret_info2.
							      object_type[j],
							      j);
				if (ACPI_FAILURE(status)) {
					return (status);
				}
			}
			break;

		case ACPI_PTYPE2_MIN:

			/* Each subpackage has a variable but minimum length */

			expected_count = package->ret_info.count1;
			if (sub_package->package.count < expected_count) {
				goto package_too_small;
			}

			/* Check the type of each subpackage element */

			status =
			    acpi_ns_check_package_elements(info, sub_elements,
							   package->ret_info.
							   object_type1,
							   sub_package->package.
							   count, 0, 0, 0);
			if (ACPI_FAILURE(status)) {
				return (status);
			}
			break;

		case ACPI_PTYPE2_COUNT:
			/*
			 * First element is the (Integer) count of elements, including
			 * the count field (the ACPI name is num_elements)
			 */
			status = acpi_ns_check_object_type(info, sub_elements,
							   ACPI_RTYPE_INTEGER,
							   0);
			if (ACPI_FAILURE(status)) {
				return (status);
			}

			/*
			 * Make sure package is large enough for the Count and is
			 * is as large as the minimum size
			 */
			expected_count = (u32)(*sub_elements)->integer.value;
			if (sub_package->package.count < expected_count) {
				goto package_too_small;
			}

			if (sub_package->package.count <
			    package->ret_info.count1) {
				expected_count = package->ret_info.count1;
				goto package_too_small;
			}

			if (expected_count == 0) {
				/*
				 * Either the num_entries element was originally zero or it was
				 * a NULL element and repaired to an Integer of value zero.
				 * In either case, repair it by setting num_entries to be the
				 * actual size of the subpackage.
				 */
				expected_count = sub_package->package.count;
				(*sub_elements)->integer.value = expected_count;
			}

			/* Check the type of each subpackage element */

			status =
			    acpi_ns_check_package_elements(info,
							   (sub_elements + 1),
							   package->ret_info.
							   object_type1,
							   (expected_count - 1),
							   0, 0, 1);
			if (ACPI_FAILURE(status)) {
				return (status);
			}
			break;

		default:	/* Should not get here, type was validated by caller */

			return (AE_AML_INTERNAL);
		}

		elements++;
	}

	return (AE_OK);

package_too_small:

	/* The subpackage count was smaller than required */

	ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname, info->node_flags,
			      "Return SubPackage[%u] is too small - found %u elements, expected %u",
			      i, sub_package->package.count, expected_count));

	return (AE_AML_OPERAND_VALUE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_check_package_elements
 *
 * PARAMETERS:  info            - Method execution information block
 *              elements        - Pointer to the package elements array
 *              type1           - Object type for first group
 *              count1          - Count for first group
 *              type2           - Object type for second group
 *              count2          - Count for second group
 *              start_index     - Start of the first group of elements
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Check that all elements of a package are of the correct object
 *              type. Supports up to two groups of different object types.
 *
 ******************************************************************************/

static acpi_status
acpi_ns_check_package_elements(struct acpi_evaluate_info *info,
			       union acpi_operand_object **elements,
			       u8 type1,
			       u32 count1,
			       u8 type2, u32 count2, u32 start_index)
{
	union acpi_operand_object **this_element = elements;
	acpi_status status;
	u32 i;

	/*
	 * Up to two groups of package elements are supported by the data
	 * structure. All elements in each group must be of the same type.
	 * The second group can have a count of zero.
	 */
	for (i = 0; i < count1; i++) {
		status = acpi_ns_check_object_type(info, this_element,
						   type1, i + start_index);
		if (ACPI_FAILURE(status)) {
			return (status);
		}

		this_element++;
	}

	for (i = 0; i < count2; i++) {
		status = acpi_ns_check_object_type(info, this_element,
						   type2,
						   (i + count1 + start_index));
		if (ACPI_FAILURE(status)) {
			return (status);
		}

		this_element++;
	}

	return (AE_OK);
}