1 // SPDX-License-Identifier: GPL-2.0
3 * User Events FTrace Test Program
5 * Copyright (c) 2021 Beau Belgrave <beaub@linux.microsoft.com>
9 #include <linux/user_events.h>
13 #include <sys/ioctl.h>
18 #include "../kselftest_harness.h"
19 #include "user_events_selftests.h"
21 const char *data_file = "/sys/kernel/tracing/user_events_data";
22 const char *status_file = "/sys/kernel/tracing/user_events_status";
23 const char *enable_file = "/sys/kernel/tracing/events/user_events/__test_event/enable";
24 const char *trace_file = "/sys/kernel/tracing/trace";
25 const char *fmt_file = "/sys/kernel/tracing/events/user_events/__test_event/format";
27 static int trace_bytes(void)
29 int fd = open(trace_file, O_RDONLY);
37 got = read(fd, buf, sizeof(buf));
53 static int skip_until_empty_line(FILE *fp)
63 if (last == '\n' && c == '\n')
72 static int get_print_fmt(char *buffer, int len)
74 FILE *fp = fopen(fmt_file, "r");
80 /* Read until empty line (Skip Common) */
81 if (skip_until_empty_line(fp) < 0)
84 /* Read until empty line (Skip Properties) */
85 if (skip_until_empty_line(fp) < 0)
88 /* Read in print_fmt: */
89 if (fgets(buffer, len, fp) == NULL)
92 newline = strchr(buffer, '\n');
106 static bool wait_for_delete(void)
110 for (i = 0; i < 1000; ++i) {
111 int fd = open(enable_file, O_RDONLY);
123 static int clear(int *check)
125 struct user_unreg unreg = {0};
128 unreg.size = sizeof(unreg);
129 unreg.disable_bit = 31;
130 unreg.disable_addr = (__u64)check;
132 fd = open(data_file, O_RDWR);
137 if (ioctl(fd, DIAG_IOCSUNREG, &unreg) == -1)
141 if (ioctl(fd, DIAG_IOCSDEL, "__test_event") == -1) {
142 if (errno == EBUSY) {
143 if (!wait_for_delete())
145 } else if (errno != ENOENT)
158 static int check_print_fmt(const char *event, const char *expected, int *check)
160 struct user_reg reg = {0};
171 fd = open(data_file, O_RDWR);
176 reg.size = sizeof(reg);
177 reg.name_args = (__u64)event;
179 reg.enable_addr = (__u64)check;
180 reg.enable_size = sizeof(*check);
182 /* Register should work */
183 ret = ioctl(fd, DIAG_IOCSREG, ®);
187 printf("Reg failed in fmt\n");
191 /* Ensure correct print_fmt */
192 ret = get_print_fmt(print_fmt, sizeof(print_fmt));
199 return strcmp(print_fmt, expected);
210 FIXTURE_SETUP(user) {
211 USER_EVENT_FIXTURE_SETUP(return, self->umount);
213 self->status_fd = open(status_file, O_RDONLY);
214 ASSERT_NE(-1, self->status_fd);
216 self->data_fd = open(data_file, O_RDWR);
217 ASSERT_NE(-1, self->data_fd);
219 self->enable_fd = -1;
222 FIXTURE_TEARDOWN(user) {
223 USER_EVENT_FIXTURE_TEARDOWN(self->umount);
225 close(self->status_fd);
226 close(self->data_fd);
228 if (self->enable_fd != -1) {
229 write(self->enable_fd, "0", sizeof("0"));
230 close(self->enable_fd);
233 if (clear(&self->check) != 0)
234 printf("WARNING: Clear didn't work!\n");
237 TEST_F(user, register_events) {
238 struct user_reg reg = {0};
239 struct user_unreg unreg = {0};
241 reg.size = sizeof(reg);
242 reg.name_args = (__u64)"__test_event u32 field1; u32 field2";
244 reg.enable_addr = (__u64)&self->check;
245 reg.enable_size = sizeof(self->check);
247 unreg.size = sizeof(unreg);
248 unreg.disable_bit = 31;
249 unreg.disable_addr = (__u64)&self->check;
251 /* Register should work */
252 ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, ®));
253 ASSERT_EQ(0, reg.write_index);
255 /* Multiple registers to the same addr + bit should fail */
256 ASSERT_EQ(-1, ioctl(self->data_fd, DIAG_IOCSREG, ®));
257 ASSERT_EQ(EADDRINUSE, errno);
259 /* Multiple registers to same name should result in same index */
261 ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, ®));
262 ASSERT_EQ(0, reg.write_index);
264 /* Multiple registers to same name but different args should fail */
266 reg.name_args = (__u64)"__test_event u32 field1;";
267 ASSERT_EQ(-1, ioctl(self->data_fd, DIAG_IOCSREG, ®));
268 ASSERT_EQ(EADDRINUSE, errno);
270 /* Ensure disabled */
271 self->enable_fd = open(enable_file, O_RDWR);
272 ASSERT_NE(-1, self->enable_fd);
273 ASSERT_NE(-1, write(self->enable_fd, "0", sizeof("0")))
275 /* Enable event and ensure bits updated in status */
276 ASSERT_NE(-1, write(self->enable_fd, "1", sizeof("1")))
277 ASSERT_EQ(1 << reg.enable_bit, self->check);
279 /* Disable event and ensure bits updated in status */
280 ASSERT_NE(-1, write(self->enable_fd, "0", sizeof("0")))
281 ASSERT_EQ(0, self->check);
283 /* File still open should return -EBUSY for delete */
284 ASSERT_EQ(-1, ioctl(self->data_fd, DIAG_IOCSDEL, "__test_event"));
285 ASSERT_EQ(EBUSY, errno);
288 ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSUNREG, &unreg));
289 unreg.disable_bit = 30;
290 ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSUNREG, &unreg));
292 /* Delete should have been auto-done after close and unregister */
293 close(self->data_fd);
295 ASSERT_EQ(true, wait_for_delete());
298 TEST_F(user, write_events) {
299 struct user_reg reg = {0};
301 __u32 field1, field2;
302 int before = 0, after = 0;
304 reg.size = sizeof(reg);
305 reg.name_args = (__u64)"__test_event u32 field1; u32 field2";
307 reg.enable_addr = (__u64)&self->check;
308 reg.enable_size = sizeof(self->check);
313 io[0].iov_base = ®.write_index;
314 io[0].iov_len = sizeof(reg.write_index);
315 io[1].iov_base = &field1;
316 io[1].iov_len = sizeof(field1);
317 io[2].iov_base = &field2;
318 io[2].iov_len = sizeof(field2);
320 /* Register should work */
321 ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, ®));
322 ASSERT_EQ(0, reg.write_index);
323 ASSERT_EQ(0, self->check);
325 /* Write should fail on invalid slot with ENOENT */
326 io[0].iov_base = &field2;
327 io[0].iov_len = sizeof(field2);
328 ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
329 ASSERT_EQ(ENOENT, errno);
330 io[0].iov_base = ®.write_index;
331 io[0].iov_len = sizeof(reg.write_index);
333 /* Write should return -EBADF when event is not enabled */
334 ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
335 ASSERT_EQ(EBADF, errno);
338 self->enable_fd = open(enable_file, O_RDWR);
339 ASSERT_NE(-1, write(self->enable_fd, "1", sizeof("1")))
341 /* Event should now be enabled */
342 ASSERT_NE(1 << reg.enable_bit, self->check);
344 /* Write should make it out to ftrace buffers */
345 before = trace_bytes();
346 ASSERT_NE(-1, writev(self->data_fd, (const struct iovec *)io, 3));
347 after = trace_bytes();
348 ASSERT_GT(after, before);
350 /* Negative index should fail with EINVAL */
351 reg.write_index = -1;
352 ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
353 ASSERT_EQ(EINVAL, errno);
356 TEST_F(user, write_empty_events) {
357 struct user_reg reg = {0};
359 int before = 0, after = 0;
361 reg.size = sizeof(reg);
362 reg.name_args = (__u64)"__test_event";
364 reg.enable_addr = (__u64)&self->check;
365 reg.enable_size = sizeof(self->check);
367 io[0].iov_base = ®.write_index;
368 io[0].iov_len = sizeof(reg.write_index);
370 /* Register should work */
371 ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, ®));
372 ASSERT_EQ(0, reg.write_index);
373 ASSERT_EQ(0, self->check);
376 self->enable_fd = open(enable_file, O_RDWR);
377 ASSERT_NE(-1, write(self->enable_fd, "1", sizeof("1")))
379 /* Event should now be enabled */
380 ASSERT_EQ(1 << reg.enable_bit, self->check);
382 /* Write should make it out to ftrace buffers */
383 before = trace_bytes();
384 ASSERT_NE(-1, writev(self->data_fd, (const struct iovec *)io, 1));
385 after = trace_bytes();
386 ASSERT_GT(after, before);
389 TEST_F(user, write_fault) {
390 struct user_reg reg = {0};
392 int l = sizeof(__u64);
395 reg.size = sizeof(reg);
396 reg.name_args = (__u64)"__test_event u64 anon";
398 reg.enable_addr = (__u64)&self->check;
399 reg.enable_size = sizeof(self->check);
401 anon = mmap(NULL, l, PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
402 ASSERT_NE(MAP_FAILED, anon);
404 io[0].iov_base = ®.write_index;
405 io[0].iov_len = sizeof(reg.write_index);
406 io[1].iov_base = anon;
409 /* Register should work */
410 ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, ®));
411 ASSERT_EQ(0, reg.write_index);
414 self->enable_fd = open(enable_file, O_RDWR);
415 ASSERT_NE(-1, write(self->enable_fd, "1", sizeof("1")))
417 /* Write should work normally */
418 ASSERT_NE(-1, writev(self->data_fd, (const struct iovec *)io, 2));
420 /* Faulted data should zero fill and work */
421 ASSERT_EQ(0, madvise(anon, l, MADV_DONTNEED));
422 ASSERT_NE(-1, writev(self->data_fd, (const struct iovec *)io, 2));
423 ASSERT_EQ(0, munmap(anon, l));
426 TEST_F(user, write_validator) {
427 struct user_reg reg = {0};
431 int before = 0, after = 0;
433 reg.size = sizeof(reg);
434 reg.name_args = (__u64)"__test_event __rel_loc char[] data";
436 reg.enable_addr = (__u64)&self->check;
437 reg.enable_size = sizeof(self->check);
439 /* Register should work */
440 ASSERT_EQ(0, ioctl(self->data_fd, DIAG_IOCSREG, ®));
441 ASSERT_EQ(0, reg.write_index);
442 ASSERT_EQ(0, self->check);
444 io[0].iov_base = ®.write_index;
445 io[0].iov_len = sizeof(reg.write_index);
446 io[1].iov_base = &loc;
447 io[1].iov_len = sizeof(loc);
448 io[2].iov_base = data;
449 bytes = snprintf(data, sizeof(data), "Test") + 1;
450 io[2].iov_len = bytes;
452 /* Undersized write should fail */
453 ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 1));
454 ASSERT_EQ(EINVAL, errno);
457 self->enable_fd = open(enable_file, O_RDWR);
458 ASSERT_NE(-1, write(self->enable_fd, "1", sizeof("1")))
460 /* Event should now be enabled */
461 ASSERT_EQ(1 << reg.enable_bit, self->check);
463 /* Full in-bounds write should work */
464 before = trace_bytes();
465 loc = DYN_LOC(0, bytes);
466 ASSERT_NE(-1, writev(self->data_fd, (const struct iovec *)io, 3));
467 after = trace_bytes();
468 ASSERT_GT(after, before);
470 /* Out of bounds write should fault (offset way out) */
471 loc = DYN_LOC(1024, bytes);
472 ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
473 ASSERT_EQ(EFAULT, errno);
475 /* Out of bounds write should fault (offset 1 byte out) */
476 loc = DYN_LOC(1, bytes);
477 ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
478 ASSERT_EQ(EFAULT, errno);
480 /* Out of bounds write should fault (size way out) */
481 loc = DYN_LOC(0, bytes + 1024);
482 ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
483 ASSERT_EQ(EFAULT, errno);
485 /* Out of bounds write should fault (size 1 byte out) */
486 loc = DYN_LOC(0, bytes + 1);
487 ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
488 ASSERT_EQ(EFAULT, errno);
490 /* Non-Null should fault */
491 memset(data, 'A', sizeof(data));
492 loc = DYN_LOC(0, bytes);
493 ASSERT_EQ(-1, writev(self->data_fd, (const struct iovec *)io, 3));
494 ASSERT_EQ(EFAULT, errno);
497 TEST_F(user, print_fmt) {
500 ret = check_print_fmt("__test_event __rel_loc char[] data",
501 "print fmt: \"data=%s\", __get_rel_str(data)",
505 ret = check_print_fmt("__test_event __data_loc char[] data",
506 "print fmt: \"data=%s\", __get_str(data)",
510 ret = check_print_fmt("__test_event s64 data",
511 "print fmt: \"data=%lld\", REC->data",
515 ret = check_print_fmt("__test_event u64 data",
516 "print fmt: \"data=%llu\", REC->data",
520 ret = check_print_fmt("__test_event s32 data",
521 "print fmt: \"data=%d\", REC->data",
525 ret = check_print_fmt("__test_event u32 data",
526 "print fmt: \"data=%u\", REC->data",
530 ret = check_print_fmt("__test_event int data",
531 "print fmt: \"data=%d\", REC->data",
535 ret = check_print_fmt("__test_event unsigned int data",
536 "print fmt: \"data=%u\", REC->data",
540 ret = check_print_fmt("__test_event s16 data",
541 "print fmt: \"data=%d\", REC->data",
545 ret = check_print_fmt("__test_event u16 data",
546 "print fmt: \"data=%u\", REC->data",
550 ret = check_print_fmt("__test_event short data",
551 "print fmt: \"data=%d\", REC->data",
555 ret = check_print_fmt("__test_event unsigned short data",
556 "print fmt: \"data=%u\", REC->data",
560 ret = check_print_fmt("__test_event s8 data",
561 "print fmt: \"data=%d\", REC->data",
565 ret = check_print_fmt("__test_event u8 data",
566 "print fmt: \"data=%u\", REC->data",
570 ret = check_print_fmt("__test_event char data",
571 "print fmt: \"data=%d\", REC->data",
575 ret = check_print_fmt("__test_event unsigned char data",
576 "print fmt: \"data=%u\", REC->data",
580 ret = check_print_fmt("__test_event char[4] data",
581 "print fmt: \"data=%s\", REC->data",
586 int main(int argc, char **argv)
588 return test_harness_run(argc, argv);