summaryrefslogtreecommitdiffstats
path: root/lib/memcpy_kunit.c
blob: 887926f0473124684ea006f6de22cb92250b455f (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Test cases for memcpy(), memmove(), and memset().
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <kunit/test.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/overflow.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/vmalloc.h>

struct some_bytes {
	union {
		u8 data[32];
		struct {
			u32 one;
			u16 two;
			u8  three;
			/* 1 byte hole */
			u32 four[4];
		};
	};
};

#define check(instance, v) do {	\
	BUILD_BUG_ON(sizeof(instance.data) != 32);	\
	for (size_t i = 0; i < sizeof(instance.data); i++) {	\
		KUNIT_ASSERT_EQ_MSG(test, instance.data[i], v, \
			"line %d: '%s' not initialized to 0x%02x @ %d (saw 0x%02x)\n", \
			__LINE__, #instance, v, i, instance.data[i]);	\
	}	\
} while (0)

#define compare(name, one, two) do { \
	BUILD_BUG_ON(sizeof(one) != sizeof(two)); \
	for (size_t i = 0; i < sizeof(one); i++) {	\
		KUNIT_EXPECT_EQ_MSG(test, one.data[i], two.data[i], \
			"line %d: %s.data[%d] (0x%02x) != %s.data[%d] (0x%02x)\n", \
			__LINE__, #one, i, one.data[i], #two, i, two.data[i]); \
	}	\
	kunit_info(test, "ok: " TEST_OP "() " name "\n");	\
} while (0)

static void memcpy_test(struct kunit *test)
{
#define TEST_OP "memcpy"
	struct some_bytes control = {
		.data = { 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
			  0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
			  0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
			  0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
			},
	};
	struct some_bytes zero = { };
	struct some_bytes middle = {
		.data = { 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
			  0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0x00,
			  0x00, 0x00, 0x00, 0x20, 0x20, 0x20, 0x20, 0x20,
			  0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
			},
	};
	struct some_bytes three = {
		.data = { 0x00, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
			  0x20, 0x00, 0x00, 0x20, 0x20, 0x20, 0x20, 0x20,
			  0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
			  0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
			},
	};
	struct some_bytes dest = { };
	int count;
	u8 *ptr;

	/* Verify static initializers. */
	check(control, 0x20);
	check(zero, 0);
	compare("static initializers", dest, zero);

	/* Verify assignment. */
	dest = control;
	compare("direct assignment", dest, control);

	/* Verify complete overwrite. */
	memcpy(dest.data, zero.data, sizeof(dest.data));
	compare("complete overwrite", dest, zero);

	/* Verify middle overwrite. */
	dest = control;
	memcpy(dest.data + 12, zero.data, 7);
	compare("middle overwrite", dest, middle);

	/* Verify argument side-effects aren't repeated. */
	dest = control;
	ptr = dest.data;
	count = 1;
	memcpy(ptr++, zero.data, count++);
	ptr += 8;
	memcpy(ptr++, zero.data, count++);
	compare("argument side-effects", dest, three);
#undef TEST_OP
}

static unsigned char larger_array [2048];

static void memmove_test(struct kunit *test)
{
#define TEST_OP "memmove"
	struct some_bytes control = {
		.data = { 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
			  0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
			  0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
			  0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
			},
	};
	struct some_bytes zero = { };
	struct some_bytes middle = {
		.data = { 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
			  0x99, 0x99, 0x99, 0x99, 0x00, 0x00, 0x00, 0x00,
			  0x00, 0x00, 0x00, 0x99, 0x99, 0x99, 0x99, 0x99,
			  0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
			},
	};
	struct some_bytes five = {
		.data = { 0x00, 0x00, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
			  0x99, 0x99, 0x00, 0x00, 0x00, 0x99, 0x99, 0x99,
			  0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
			  0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
			},
	};
	struct some_bytes overlap = {
		.data = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
			  0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
			  0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
			  0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
			},
	};
	struct some_bytes overlap_expected = {
		.data = { 0x00, 0x01, 0x00, 0x01, 0x02, 0x03, 0x04, 0x07,
			  0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
			  0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
			  0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99, 0x99,
			},
	};
	struct some_bytes dest = { };
	int count;
	u8 *ptr;

	/* Verify static initializers. */
	check(control, 0x99);
	check(zero, 0);
	compare("static initializers", zero, dest);

	/* Verify assignment. */
	dest = control;
	compare("direct assignment", dest, control);

	/* Verify complete overwrite. */
	memmove(dest.data, zero.data, sizeof(dest.data));
	compare("complete overwrite", dest, zero);

	/* Verify middle overwrite. */
	dest = control;
	memmove(dest.data + 12, zero.data, 7);
	compare("middle overwrite", dest, middle);

	/* Verify argument side-effects aren't repeated. */
	dest = control;
	ptr = dest.data;
	count = 2;
	memmove(ptr++, zero.data, count++);
	ptr += 9;
	memmove(ptr++, zero.data, count++);
	compare("argument side-effects", dest, five);

	/* Verify overlapping overwrite is correct. */
	ptr = &overlap.data[2];
	memmove(ptr, overlap.data, 5);
	compare("overlapping write", overlap, overlap_expected);

	/* Verify larger overlapping moves. */
	larger_array[256] = 0xAAu;
	/*
	 * Test a backwards overlapping memmove first. 256 and 1024 are
	 * important for i386 to use rep movsl.
	 */
	memmove(larger_array, larger_array + 256, 1024);
	KUNIT_ASSERT_EQ(test, larger_array[0], 0xAAu);
	KUNIT_ASSERT_EQ(test, larger_array[256], 0x00);
	KUNIT_ASSERT_NULL(test,
		memchr(larger_array + 1, 0xaa, ARRAY_SIZE(larger_array) - 1));
	/* Test a forwards overlapping memmove. */
	larger_array[0] = 0xBBu;
	memmove(larger_array + 256, larger_array, 1024);
	KUNIT_ASSERT_EQ(test, larger_array[0], 0xBBu);
	KUNIT_ASSERT_EQ(test, larger_array[256], 0xBBu);
	KUNIT_ASSERT_NULL(test, memchr(larger_array + 1, 0xBBu, 256 - 1));
	KUNIT_ASSERT_NULL(test,
		memchr(larger_array + 257, 0xBBu, ARRAY_SIZE(larger_array) - 257));
#undef TEST_OP
}

static void memset_test(struct kunit *test)
{
#define TEST_OP "memset"
	struct some_bytes control = {
		.data = { 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
			  0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
			  0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
			  0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
			},
	};
	struct some_bytes complete = {
		.data = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
			  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
			  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
			  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
			},
	};
	struct some_bytes middle = {
		.data = { 0x30, 0x30, 0x30, 0x30, 0x31, 0x31, 0x31, 0x31,
			  0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31,
			  0x31, 0x31, 0x31, 0x31, 0x30, 0x30, 0x30, 0x30,
			  0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
			},
	};
	struct some_bytes three = {
		.data = { 0x60, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
			  0x30, 0x61, 0x61, 0x30, 0x30, 0x30, 0x30, 0x30,
			  0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
			  0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
			},
	};
	struct some_bytes after = {
		.data = { 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x72,
			  0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72,
			  0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72,
			  0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72,
			},
	};
	struct some_bytes startat = {
		.data = { 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
			  0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79,
			  0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79,
			  0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79,
			},
	};
	struct some_bytes dest = { };
	int count, value;
	u8 *ptr;

	/* Verify static initializers. */
	check(control, 0x30);
	check(dest, 0);

	/* Verify assignment. */
	dest = control;
	compare("direct assignment", dest, control);

	/* Verify complete overwrite. */
	memset(dest.data, 0xff, sizeof(dest.data));
	compare("complete overwrite", dest, complete);

	/* Verify middle overwrite. */
	dest = control;
	memset(dest.data + 4, 0x31, 16);
	compare("middle overwrite", dest, middle);

	/* Verify argument side-effects aren't repeated. */
	dest = control;
	ptr = dest.data;
	value = 0x60;
	count = 1;
	memset(ptr++, value++, count++);
	ptr += 8;
	memset(ptr++, value++, count++);
	compare("argument side-effects", dest, three);

	/* Verify memset_after() */
	dest = control;
	memset_after(&dest, 0x72, three);
	compare("memset_after()", dest, after);

	/* Verify memset_startat() */
	dest = control;
	memset_startat(&dest, 0x79, four);
	compare("memset_startat()", dest, startat);
#undef TEST_OP
}

static u8 large_src[1024];
static u8 large_dst[2048];
static const u8 large_zero[2048];

static void set_random_nonzero(struct kunit *test, u8 *byte)
{
	int failed_rng = 0;

	while (*byte == 0) {
		get_random_bytes(byte, 1);
		KUNIT_ASSERT_LT_MSG(test, failed_rng++, 100,
				    "Is the RNG broken?");
	}
}

static void init_large(struct kunit *test)
{
	if (!IS_ENABLED(CONFIG_MEMCPY_SLOW_KUNIT_TEST))
		kunit_skip(test, "Slow test skipped. Enable with CONFIG_MEMCPY_SLOW_KUNIT_TEST=y");

	/* Get many bit patterns. */
	get_random_bytes(large_src, ARRAY_SIZE(large_src));

	/* Make sure we have non-zero edges. */
	set_random_nonzero(test, &large_src[0]);
	set_random_nonzero(test, &large_src[ARRAY_SIZE(large_src) - 1]);

	/* Explicitly zero the entire destination. */
	memset(large_dst, 0, ARRAY_SIZE(large_dst));
}

/*
 * Instead of an indirect function call for "copy" or a giant macro,
 * use a bool to pick memcpy or memmove.
 */
static void copy_large_test(struct kunit *test, bool use_memmove)
{
	init_large(test);

	/* Copy a growing number of non-overlapping bytes ... */
	for (int bytes = 1; bytes <= ARRAY_SIZE(large_src); bytes++) {
		/* Over a shifting destination window ... */
		for (int offset = 0; offset < ARRAY_SIZE(large_src); offset++) {
			int right_zero_pos = offset + bytes;
			int right_zero_size = ARRAY_SIZE(large_dst) - right_zero_pos;

			/* Copy! */
			if (use_memmove)
				memmove(large_dst + offset, large_src, bytes);
			else
				memcpy(large_dst + offset, large_src, bytes);

			/* Did we touch anything before the copy area? */
			KUNIT_ASSERT_EQ_MSG(test,
				memcmp(large_dst, large_zero, offset), 0,
				"with size %d at offset %d", bytes, offset);
			/* Did we touch anything after the copy area? */
			KUNIT_ASSERT_EQ_MSG(test,
				memcmp(&large_dst[right_zero_pos], large_zero, right_zero_size), 0,
				"with size %d at offset %d", bytes, offset);

			/* Are we byte-for-byte exact across the copy? */
			KUNIT_ASSERT_EQ_MSG(test,
				memcmp(large_dst + offset, large_src, bytes), 0,
				"with size %d at offset %d", bytes, offset);

			/* Zero out what we copied for the next cycle. */
			memset(large_dst + offset, 0, bytes);
		}
		/* Avoid stall warnings if this loop gets slow. */
		cond_resched();
	}
}

static void memcpy_large_test(struct kunit *test)
{
	copy_large_test(test, false);
}

static void memmove_large_test(struct kunit *test)
{
	copy_large_test(test, true);
}

/*
 * On the assumption that boundary conditions are going to be the most
 * sensitive, instead of taking a full step (inc) each iteration,
 * take single index steps for at least the first "inc"-many indexes
 * from the "start" and at least the last "inc"-many indexes before
 * the "end". When in the middle, take full "inc"-wide steps. For
 * example, calling next_step(idx, 1, 15, 3) with idx starting at 0
 * would see the following pattern: 1 2 3 4 7 10 11 12 13 14 15.
 */
static int next_step(int idx, int start, int end, int inc)
{
	start += inc;
	end -= inc;

	if (idx < start || idx + inc > end)
		inc = 1;
	return idx + inc;
}

static void inner_loop(struct kunit *test, int bytes, int d_off, int s_off)
{
	int left_zero_pos, left_zero_size;
	int right_zero_pos, right_zero_size;
	int src_pos, src_orig_pos, src_size;
	int pos;

	/* Place the source in the destination buffer. */
	memcpy(&large_dst[s_off], large_src, bytes);

	/* Copy to destination offset. */
	memmove(&large_dst[d_off], &large_dst[s_off], bytes);

	/* Make sure destination entirely matches. */
	KUNIT_ASSERT_EQ_MSG(test, memcmp(&large_dst[d_off], large_src, bytes), 0,
		"with size %d at src offset %d and dest offset %d",
		bytes, s_off, d_off);

	/* Calculate the expected zero spans. */
	if (s_off < d_off) {
		left_zero_pos = 0;
		left_zero_size = s_off;

		right_zero_pos = d_off + bytes;
		right_zero_size = ARRAY_SIZE(large_dst) - right_zero_pos;

		src_pos = s_off;
		src_orig_pos = 0;
		src_size = d_off - s_off;
	} else {
		left_zero_pos = 0;
		left_zero_size = d_off;

		right_zero_pos = s_off + bytes;
		right_zero_size = ARRAY_SIZE(large_dst) - right_zero_pos;

		src_pos = d_off + bytes;
		src_orig_pos = src_pos - s_off;
		src_size = right_zero_pos - src_pos;
	}

	/* Check non-overlapping source is unchanged.*/
	KUNIT_ASSERT_EQ_MSG(test,
		memcmp(&large_dst[src_pos], &large_src[src_orig_pos], src_size), 0,
		"with size %d at src offset %d and dest offset %d",
		bytes, s_off, d_off);

	/* Check leading buffer contents are zero. */
	KUNIT_ASSERT_EQ_MSG(test,
		memcmp(&large_dst[left_zero_pos], large_zero, left_zero_size), 0,
		"with size %d at src offset %d and dest offset %d",
		bytes, s_off, d_off);
	/* Check trailing buffer contents are zero. */
	KUNIT_ASSERT_EQ_MSG(test,
		memcmp(&large_dst[right_zero_pos], large_zero, right_zero_size), 0,
		"with size %d at src offset %d and dest offset %d",
		bytes, s_off, d_off);

	/* Zero out everything not already zeroed.*/
	pos = left_zero_pos + left_zero_size;
	memset(&large_dst[pos], 0, right_zero_pos - pos);
}

static void memmove_overlap_test(struct kunit *test)
{
	/*
	 * Running all possible offset and overlap combinations takes a
	 * very long time. Instead, only check up to 128 bytes offset
	 * into the destination buffer (which should result in crossing
	 * cachelines), with a step size of 1 through 7 to try to skip some
	 * redundancy.
	 */
	static const int offset_max = 128; /* less than ARRAY_SIZE(large_src); */
	static const int bytes_step = 7;
	static const int window_step = 7;

	static const int bytes_start = 1;
	static const int bytes_end = ARRAY_SIZE(large_src) + 1;

	init_large(test);

	/* Copy a growing number of overlapping bytes ... */
	for (int bytes = bytes_start; bytes < bytes_end;
	     bytes = next_step(bytes, bytes_start, bytes_end, bytes_step)) {

		/* Over a shifting destination window ... */
		for (int d_off = 0; d_off < offset_max; d_off++) {
			int s_start = max(d_off - bytes, 0);
			int s_end = min_t(int, d_off + bytes, ARRAY_SIZE(large_src));

			/* Over a shifting source window ... */
			for (int s_off = s_start; s_off < s_end;
			     s_off = next_step(s_off, s_start, s_end, window_step))
				inner_loop(test, bytes, d_off, s_off);

			/* Avoid stall warnings. */
			cond_resched();
		}
	}
}

static void strtomem_test(struct kunit *test)
{
	static const char input[sizeof(unsigned long)] = "hi";
	static const char truncate[] = "this is too long";
	struct {
		unsigned long canary1;
		unsigned char output[sizeof(unsigned long)] __nonstring;
		unsigned long canary2;
	} wrap;

	memset(&wrap, 0xFF, sizeof(wrap));
	KUNIT_EXPECT_EQ_MSG(test, wrap.canary1, ULONG_MAX,
			    "bad initial canary value");
	KUNIT_EXPECT_EQ_MSG(test, wrap.canary2, ULONG_MAX,
			    "bad initial canary value");

	/* Check unpadded copy leaves surroundings untouched. */
	strtomem(wrap.output, input);
	KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX);
	KUNIT_EXPECT_EQ(test, wrap.output[0], input[0]);
	KUNIT_EXPECT_EQ(test, wrap.output[1], input[1]);
	for (size_t i = 2; i < sizeof(wrap.output); i++)
		KUNIT_EXPECT_EQ(test, wrap.output[i], 0xFF);
	KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX);

	/* Check truncated copy leaves surroundings untouched. */
	memset(&wrap, 0xFF, sizeof(wrap));
	strtomem(wrap.output, truncate);
	KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX);
	for (size_t i = 0; i < sizeof(wrap.output); i++)
		KUNIT_EXPECT_EQ(test, wrap.output[i], truncate[i]);
	KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX);

	/* Check padded copy leaves only string padded. */
	memset(&wrap, 0xFF, sizeof(wrap));
	strtomem_pad(wrap.output, input, 0xAA);
	KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX);
	KUNIT_EXPECT_EQ(test, wrap.output[0], input[0]);
	KUNIT_EXPECT_EQ(test, wrap.output[1], input[1]);
	for (size_t i = 2; i < sizeof(wrap.output); i++)
		KUNIT_EXPECT_EQ(test, wrap.output[i], 0xAA);
	KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX);

	/* Check truncated padded copy has no padding. */
	memset(&wrap, 0xFF, sizeof(wrap));
	strtomem(wrap.output, truncate);
	KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX);
	for (size_t i = 0; i < sizeof(wrap.output); i++)
		KUNIT_EXPECT_EQ(test, wrap.output[i], truncate[i]);
	KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX);
}

static struct kunit_case memcpy_test_cases[] = {
	KUNIT_CASE(memset_test),
	KUNIT_CASE(memcpy_test),
	KUNIT_CASE(memcpy_large_test),
	KUNIT_CASE(memmove_test),
	KUNIT_CASE(memmove_large_test),
	KUNIT_CASE(memmove_overlap_test),
	KUNIT_CASE(strtomem_test),
	{}
};

static struct kunit_suite memcpy_test_suite = {
	.name = "memcpy",
	.test_cases = memcpy_test_cases,
};

kunit_test_suite(memcpy_test_suite);

MODULE_LICENSE("GPL");