summaryrefslogtreecommitdiff
path: root/tools/testing/selftests/user_events/ftrace_test.c
blob: eb6904d89f1454ad177e50408f4e1b24853fee21 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * User Events FTrace Test Program
 *
 * Copyright (c) 2021 Beau Belgrave <beaub@linux.microsoft.com>
 */

#include <errno.h>
#include <linux/user_events.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <unistd.h>

#include "../kselftest_harness.h"

const char *data_file = "/sys/kernel/tracing/user_events_data";
const char *status_file = "/sys/kernel/tracing/user_events_status";
const char *enable_file = "/sys/kernel/tracing/events/user_events/__test_event/enable";
const char *trace_file = "/sys/kernel/tracing/trace";
const char *fmt_file = "/sys/kernel/tracing/events/user_events/__test_event/format";

static int trace_bytes(void)
{
	int fd = open(trace_file, O_RDONLY);
	char buf[256];
	int bytes = 0, got;

	if (fd == -1)
		return -1;

	while (true) {
		got = read(fd, buf, sizeof(buf));

		if (got == -1)
			return -1;

		if (got == 0)
			break;

		bytes += got;
	}

	close(fd);

	return bytes;
}

static int skip_until_empty_line(FILE *fp)
{
	int c, last = 0;

	while (true) {
		c = getc(fp);

		if (c == EOF)
			break;

		if (last == '\n' && c == '\n')
			return 0;

		last = c;
	}

	return -1;
}

static int get_print_fmt(char *buffer, int len)
{
	FILE *fp = fopen(fmt_file, "r");
	char *newline;

	if (!fp)
		return -1;

	/* Read until empty line (Skip Common) */
	if (skip_until_empty_line(fp) < 0)
		goto err;

	/* Read until empty line (Skip Properties) */
	if (skip_until_empty_line(fp) < 0)
		goto err;

	/* Read in print_fmt: */
	if (fgets(buffer, len, fp) == NULL)
		goto err;

	newline = strchr(buffer, '\n');

	if (newline)
		*newline = '\0';

	fclose(fp);

	return 0;
err:
	fclose(fp);

	return -1;
}

static bool wait_for_delete(void)
{
	int i;

	for (i = 0; i < 1000; ++i) {
		int fd = open(enable_file, O_RDONLY);

		if (fd == -1)
			return true;

		close(fd);
		usleep(1000);
	}

	return false;
}

static int clear(int *check)
{
	struct user_unreg unreg = {0};
	int fd;

	unreg.size = sizeof(unreg);
	unreg.disable_bit = 31;
	unreg.disable_addr = (__u64)check;

	fd = open(data_file, O_RDWR);

	if (fd == -1)
		return -1;

	if (ioctl(fd, DIAG_IOCSUNREG, &unreg) == -1)
		if (errno != ENOENT)
			goto fail;

	if (ioctl(fd, DIAG_IOCSDEL, "__test_event") == -1) {
		if (errno == EBUSY) {
			if (!wait_for_delete())
				goto fail;
		} else if (errno != ENOENT)
			goto fail;
	}

	close(fd);

	return 0;
fail:
	close(fd);

	return -1;
}

static int check_print_fmt(const char *event, const char *expected, int *check)
{
	struct user_reg reg = {0};
	char print_fmt[256];
	int ret;
	int fd;

	/* Ensure cleared */
	ret = clear(check);

	if (ret != 0)
		return ret;

	fd = open(data_file, O_RDWR);

	if (fd == -1)
		return fd;

	reg.size = sizeof(reg);
	reg.name_args = (__u64)event;
	reg.enable_bit = 31;
	reg.enable_addr = (__u64)check;
	reg.enable_size = sizeof(*check);

	/* Register should work */
	ret = ioctl(fd, DIAG_IOCSREG, &reg);

	if (ret != 0) {
		close(fd);
		printf("Reg failed in fmt\n");
		return ret;
	}

	/* Ensure correct print_fmt */
	ret = get_print_fmt(print_fmt, sizeof(print_fmt));

	close(fd);

	if (ret != 0)
		return ret;

	return strcmp(print_fmt, expected);
}

FIXTURE(user) {
	int status_fd;
	int data_fd;
	int enable_fd;
	int check;
};

FIXTURE_SETUP(user) {
	self->status_fd = open(status_file, O_RDONLY);
	ASSERT_NE(-1, self->status_fd);

	self->data_fd = open(data_file, O_RDWR);
	ASSERT_NE(-1, self->data_fd);

	self->enable_fd = -1;
}

FIXTURE_TEARDOWN(user) {
	close(self->status_fd);
	close(self->data_fd);

	if (self->enable_fd != -1) {
		write(self->enable_fd, "0", sizeof("0"));
		close(self->enable_fd);
	}

	if (clear(&self->check) != 0)
		printf("WARNING: Clear didn't work!\n");
}

TEST_F(user, register_events) {
	struct user_reg reg = {0};
	struct user_unreg unreg = {0};

	reg.size = sizeof(reg);
	reg.name_args = (__u64)"__test_event u32 field1; u32 field2";
	reg.enable_bit = 31;
	reg.enable_addr = (__u64)&self->check;
	reg.enable_size = sizeof(self->check);

	unreg.size = sizeof(unreg);
	unreg.disable_bit = 31;
	unreg.disable_addr = (__u64)&self->check;

	/* Register should work */
	ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, &reg));
	ASSERT_EQ(0, reg.write_index);

	/* Multiple registers to the same addr + bit should fail */
	ASSERT_EQ(-1, ioctl(self->data_fd, DIAG_IOCSREG, &reg));
	ASSERT_EQ(EADDRINUSE, errno);

	/* Multiple registers to same name should result in same index */
	reg.enable_bit = 30;
	ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, &reg));
	ASSERT_EQ(0, reg.write_index);

	/* Multiple registers to same name but different args should fail */
	reg.enable_bit = 29;
	reg.name_args = (__u64)"__test_event u32 field1;";
	ASSERT_EQ(-1, ioctl(self->data_fd, DIAG_IOCSREG, &reg));
	ASSERT_EQ(EADDRINUSE, errno);

	/* Ensure disabled */
	self->enable_fd = open(enable_file, O_RDWR);
	ASSERT_NE(-1, self->enable_fd);
	ASSERT_NE(-1, write(self->enable_fd, "0", sizeof("0")))

	/* Enable event and ensure bits updated in status */
	ASSERT_NE(-1, write(self->enable_fd, "1", sizeof("1")))
	ASSERT_EQ(1 << reg.enable_bit, self->check);

	/* Disable event and ensure bits updated in status */
	ASSERT_NE(-1, write(self->enable_fd, "0", sizeof("0")))
	ASSERT_EQ(0, self->check);

	/* File still open should return -EBUSY for delete */
	ASSERT_EQ(-1, ioctl(self->data_fd, DIAG_IOCSDEL, "__test_event"));
	ASSERT_EQ(EBUSY, errno);

	/* Unregister */
	ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSUNREG, &unreg));
	unreg.disable_bit = 30;
	ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSUNREG, &unreg));

	/* Delete should have been auto-done after close and unregister */
	close(self->data_fd);

	ASSERT_EQ(true, wait_for_delete());
}

TEST_F(user, write_events) {
	struct user_reg reg = {0};
	struct iovec io[3];
	__u32 field1, field2;
	int before = 0, after = 0;

	reg.size = sizeof(reg);
	reg.name_args = (__u64)"__test_event u32 field1; u32 field2";
	reg.enable_bit = 31;
	reg.enable_addr = (__u64)&self->check;
	reg.enable_size = sizeof(self->check);

	field1 = 1;
	field2 = 2;

	io[0].iov_base = &reg.write_index;
	io[0].iov_len = sizeof(reg.write_index);
	io[1].iov_base = &field1;
	io[1].iov_len = sizeof(field1);
	io[2].iov_base = &field2;
	io[2].iov_len = sizeof(field2);

	/* Register should work */
	ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, &reg));
	ASSERT_EQ(0, reg.write_index);
	ASSERT_EQ(0, self->check);

	/* Write should fail on invalid slot with ENOENT */
	io[0].iov_base = &field2;
	io[0].iov_len = sizeof(field2);
	ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
	ASSERT_EQ(ENOENT, errno);
	io[0].iov_base = &reg.write_index;
	io[0].iov_len = sizeof(reg.write_index);

	/* Enable event */
	self->enable_fd = open(enable_file, O_RDWR);
	ASSERT_NE(-1, write(self->enable_fd, "1", sizeof("1")))

	/* Event should now be enabled */
	ASSERT_NE(1 << reg.enable_bit, self->check);

	/* Write should make it out to ftrace buffers */
	before = trace_bytes();
	ASSERT_NE(-1, writev(self->data_fd, (const struct iovec *)io, 3));
	after = trace_bytes();
	ASSERT_GT(after, before);

	/* Negative index should fail with EINVAL */
	reg.write_index = -1;
	ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
	ASSERT_EQ(EINVAL, errno);
}

TEST_F(user, write_empty_events) {
	struct user_reg reg = {0};
	struct iovec io[1];
	int before = 0, after = 0;

	reg.size = sizeof(reg);
	reg.name_args = (__u64)"__test_event";
	reg.enable_bit = 31;
	reg.enable_addr = (__u64)&self->check;
	reg.enable_size = sizeof(self->check);

	io[0].iov_base = &reg.write_index;
	io[0].iov_len = sizeof(reg.write_index);

	/* Register should work */
	ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, &reg));
	ASSERT_EQ(0, reg.write_index);
	ASSERT_EQ(0, self->check);

	/* Enable event */
	self->enable_fd = open(enable_file, O_RDWR);
	ASSERT_NE(-1, write(self->enable_fd, "1", sizeof("1")))

	/* Event should now be enabled */
	ASSERT_EQ(1 << reg.enable_bit, self->check);

	/* Write should make it out to ftrace buffers */
	before = trace_bytes();
	ASSERT_NE(-1, writev(self->data_fd, (const struct iovec *)io, 1));
	after = trace_bytes();
	ASSERT_GT(after, before);
}

TEST_F(user, write_fault) {
	struct user_reg reg = {0};
	struct iovec io[2];
	int l = sizeof(__u64);
	void *anon;

	reg.size = sizeof(reg);
	reg.name_args = (__u64)"__test_event u64 anon";
	reg.enable_bit = 31;
	reg.enable_addr = (__u64)&self->check;
	reg.enable_size = sizeof(self->check);

	anon = mmap(NULL, l, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
	ASSERT_NE(MAP_FAILED, anon);

	io[0].iov_base = &reg.write_index;
	io[0].iov_len = sizeof(reg.write_index);
	io[1].iov_base = anon;
	io[1].iov_len = l;

	/* Register should work */
	ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, &reg));
	ASSERT_EQ(0, reg.write_index);

	/* Write should work normally */
	ASSERT_NE(-1, writev(self->data_fd, (const struct iovec *)io, 2));

	/* Faulted data should zero fill and work */
	ASSERT_EQ(0, madvise(anon, l, MADV_DONTNEED));
	ASSERT_NE(-1, writev(self->data_fd, (const struct iovec *)io, 2));
	ASSERT_EQ(0, munmap(anon, l));
}

TEST_F(user, write_validator) {
	struct user_reg reg = {0};
	struct iovec io[3];
	int loc, bytes;
	char data[8];
	int before = 0, after = 0;

	reg.size = sizeof(reg);
	reg.name_args = (__u64)"__test_event __rel_loc char[] data";
	reg.enable_bit = 31;
	reg.enable_addr = (__u64)&self->check;
	reg.enable_size = sizeof(self->check);

	/* Register should work */
	ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, &reg));
	ASSERT_EQ(0, reg.write_index);
	ASSERT_EQ(0, self->check);

	io[0].iov_base = &reg.write_index;
	io[0].iov_len = sizeof(reg.write_index);
	io[1].iov_base = &loc;
	io[1].iov_len = sizeof(loc);
	io[2].iov_base = data;
	bytes = snprintf(data, sizeof(data), "Test") + 1;
	io[2].iov_len = bytes;

	/* Undersized write should fail */
	ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 1));
	ASSERT_EQ(EINVAL, errno);

	/* Enable event */
	self->enable_fd = open(enable_file, O_RDWR);
	ASSERT_NE(-1, write(self->enable_fd, "1", sizeof("1")))

	/* Event should now be enabled */
	ASSERT_EQ(1 << reg.enable_bit, self->check);

	/* Full in-bounds write should work */
	before = trace_bytes();
	loc = DYN_LOC(0, bytes);
	ASSERT_NE(-1, writev(self->data_fd, (const struct iovec *)io, 3));
	after = trace_bytes();
	ASSERT_GT(after, before);

	/* Out of bounds write should fault (offset way out) */
	loc = DYN_LOC(1024, bytes);
	ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
	ASSERT_EQ(EFAULT, errno);

	/* Out of bounds write should fault (offset 1 byte out) */
	loc = DYN_LOC(1, bytes);
	ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
	ASSERT_EQ(EFAULT, errno);

	/* Out of bounds write should fault (size way out) */
	loc = DYN_LOC(0, bytes + 1024);
	ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
	ASSERT_EQ(EFAULT, errno);

	/* Out of bounds write should fault (size 1 byte out) */
	loc = DYN_LOC(0, bytes + 1);
	ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
	ASSERT_EQ(EFAULT, errno);

	/* Non-Null should fault */
	memset(data, 'A', sizeof(data));
	loc = DYN_LOC(0, bytes);
	ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
	ASSERT_EQ(EFAULT, errno);
}

TEST_F(user, print_fmt) {
	int ret;

	ret = check_print_fmt("__test_event __rel_loc char[] data",
			      "print fmt: \"data=%s\", __get_rel_str(data)",
			      &self->check);
	ASSERT_EQ(0, ret);

	ret = check_print_fmt("__test_event __data_loc char[] data",
			      "print fmt: \"data=%s\", __get_str(data)",
			      &self->check);
	ASSERT_EQ(0, ret);

	ret = check_print_fmt("__test_event s64 data",
			      "print fmt: \"data=%lld\", REC->data",
			      &self->check);
	ASSERT_EQ(0, ret);

	ret = check_print_fmt("__test_event u64 data",
			      "print fmt: \"data=%llu\", REC->data",
			      &self->check);
	ASSERT_EQ(0, ret);

	ret = check_print_fmt("__test_event s32 data",
			      "print fmt: \"data=%d\", REC->data",
			      &self->check);
	ASSERT_EQ(0, ret);

	ret = check_print_fmt("__test_event u32 data",
			      "print fmt: \"data=%u\", REC->data",
			      &self->check);
	ASSERT_EQ(0, ret);

	ret = check_print_fmt("__test_event int data",
			      "print fmt: \"data=%d\", REC->data",
			      &self->check);
	ASSERT_EQ(0, ret);

	ret = check_print_fmt("__test_event unsigned int data",
			      "print fmt: \"data=%u\", REC->data",
			      &self->check);
	ASSERT_EQ(0, ret);

	ret = check_print_fmt("__test_event s16 data",
			      "print fmt: \"data=%d\", REC->data",
			      &self->check);
	ASSERT_EQ(0, ret);

	ret = check_print_fmt("__test_event u16 data",
			      "print fmt: \"data=%u\", REC->data",
			      &self->check);
	ASSERT_EQ(0, ret);

	ret = check_print_fmt("__test_event short data",
			      "print fmt: \"data=%d\", REC->data",
			      &self->check);
	ASSERT_EQ(0, ret);

	ret = check_print_fmt("__test_event unsigned short data",
			      "print fmt: \"data=%u\", REC->data",
			      &self->check);
	ASSERT_EQ(0, ret);

	ret = check_print_fmt("__test_event s8 data",
			      "print fmt: \"data=%d\", REC->data",
			      &self->check);
	ASSERT_EQ(0, ret);

	ret = check_print_fmt("__test_event u8 data",
			      "print fmt: \"data=%u\", REC->data",
			      &self->check);
	ASSERT_EQ(0, ret);

	ret = check_print_fmt("__test_event char data",
			      "print fmt: \"data=%d\", REC->data",
			      &self->check);
	ASSERT_EQ(0, ret);

	ret = check_print_fmt("__test_event unsigned char data",
			      "print fmt: \"data=%u\", REC->data",
			      &self->check);
	ASSERT_EQ(0, ret);

	ret = check_print_fmt("__test_event char[4] data",
			      "print fmt: \"data=%s\", REC->data",
			      &self->check);
	ASSERT_EQ(0, ret);
}

int main(int argc, char **argv)
{
	return test_harness_run(argc, argv);
}