| 1 | /* |
| 2 | * Copyright (C) 2016 Julien Desfossez <jdesfossez@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include <stdio.h> |
| 9 | #include <poll.h> |
| 10 | #include <signal.h> |
| 11 | #include <unistd.h> |
| 12 | #include <sys/syscall.h> |
| 13 | #include <sys/types.h> |
| 14 | #include <sys/stat.h> |
| 15 | #include <fcntl.h> |
| 16 | #include <stdlib.h> |
| 17 | #include <string.h> |
| 18 | #include <stddef.h> |
| 19 | #include <sys/select.h> |
| 20 | #include <sys/epoll.h> |
| 21 | #include <popt.h> |
| 22 | #include <sys/time.h> |
| 23 | #include <sys/resource.h> |
| 24 | #include <limits.h> |
| 25 | #include <pthread.h> |
| 26 | #include <sys/mman.h> |
| 27 | #include <common/compat/time.h> |
| 28 | #include <common/error.h> |
| 29 | |
| 30 | #define BUF_SIZE 256 |
| 31 | #define NB_FD 1 |
| 32 | #define MAX_FDS 2047 |
| 33 | #define NR_ITER 1000 /* for stress-tests */ |
| 34 | |
| 35 | #define MIN_NR_FDS 5 /* the minimum number of open FDs required for the test to run */ |
| 36 | #define BIG_SELECT_FD 1022 |
| 37 | |
| 38 | #define MSEC_PER_USEC 1000 |
| 39 | #define MSEC_PER_NSEC (MSEC_PER_USEC * 1000) |
| 40 | |
| 41 | static int timeout; /* seconds, -1 to disable */ |
| 42 | static volatile int stop_thread; |
| 43 | static int wait_fd; |
| 44 | |
| 45 | /* Used by logging utils. */ |
| 46 | int lttng_opt_quiet, lttng_opt_verbose, lttng_opt_mi; |
| 47 | |
| 48 | static void run_working_cases(FILE *validation_output_file); |
| 49 | static void pselect_invalid_fd(FILE *validation_output_file); |
| 50 | static void test_ppoll_big(FILE *validation_output_file); |
| 51 | static void ppoll_fds_buffer_overflow(FILE *validation_output_file); |
| 52 | static void pselect_invalid_pointer(FILE *validation_output_file); |
| 53 | static void ppoll_fds_ulong_max(FILE *validation_output_file); |
| 54 | static void epoll_pwait_invalid_pointer(FILE *validation_output_file); |
| 55 | static void epoll_pwait_int_max(FILE *validation_output_file); |
| 56 | static void ppoll_concurrent_write(FILE *validation_output_file); |
| 57 | static void epoll_pwait_concurrent_munmap(FILE *validation_output_file); |
| 58 | |
| 59 | typedef void (*test_case_cb)(FILE *output_file); |
| 60 | |
| 61 | static const struct test_case { |
| 62 | test_case_cb run; |
| 63 | bool produces_validation_info; |
| 64 | int timeout; |
| 65 | } test_cases [] = |
| 66 | { |
| 67 | { .run = run_working_cases, .produces_validation_info = true, .timeout = -1 }, |
| 68 | { .run = run_working_cases, .produces_validation_info = true, .timeout = 1 }, |
| 69 | { .run = pselect_invalid_fd, .produces_validation_info = false }, |
| 70 | { .run = test_ppoll_big, .produces_validation_info = false }, |
| 71 | { .run = ppoll_fds_buffer_overflow, .produces_validation_info = false }, |
| 72 | { .run = pselect_invalid_pointer, .produces_validation_info = false }, |
| 73 | { .run = ppoll_fds_ulong_max, .produces_validation_info = false }, |
| 74 | { .run = epoll_pwait_invalid_pointer, .produces_validation_info = true }, |
| 75 | { .run = epoll_pwait_int_max, .produces_validation_info = true }, |
| 76 | { .run = ppoll_concurrent_write, .produces_validation_info = false }, |
| 77 | { .run = epoll_pwait_concurrent_munmap, .produces_validation_info = true }, |
| 78 | }; |
| 79 | |
| 80 | struct ppoll_thread_data { |
| 81 | struct pollfd *ufds; |
| 82 | int value; |
| 83 | }; |
| 84 | |
| 85 | static |
| 86 | void test_select_big(void) |
| 87 | { |
| 88 | fd_set rfds, wfds, exfds; |
| 89 | struct timeval tv; |
| 90 | int ret; |
| 91 | int fd2; |
| 92 | char buf[BUF_SIZE]; |
| 93 | |
| 94 | FD_ZERO(&rfds); |
| 95 | FD_ZERO(&wfds); |
| 96 | FD_ZERO(&exfds); |
| 97 | |
| 98 | fd2 = dup2(wait_fd, BIG_SELECT_FD); |
| 99 | if (fd2 < 0) { |
| 100 | PERROR("dup2"); |
| 101 | goto end; |
| 102 | } |
| 103 | FD_SET(fd2, &rfds); |
| 104 | |
| 105 | tv.tv_sec = 0; |
| 106 | tv.tv_usec = timeout * MSEC_PER_USEC; |
| 107 | |
| 108 | if (timeout > 0) { |
| 109 | ret = select(fd2 + 1, &rfds, &wfds, &exfds, &tv); |
| 110 | } else { |
| 111 | ret = select(fd2 + 1, &rfds, &wfds, &exfds, NULL); |
| 112 | } |
| 113 | |
| 114 | if (ret == -1) { |
| 115 | PERROR("select()"); |
| 116 | } else if (ret) { |
| 117 | ret = read(wait_fd, buf, BUF_SIZE); |
| 118 | if (ret < 0) { |
| 119 | PERROR("[select] read"); |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | ret = close(BIG_SELECT_FD); |
| 124 | if (ret) { |
| 125 | PERROR("close"); |
| 126 | } |
| 127 | |
| 128 | end: |
| 129 | return; |
| 130 | } |
| 131 | |
| 132 | static |
| 133 | void test_pselect(void) |
| 134 | { |
| 135 | fd_set rfds; |
| 136 | struct timespec tv; |
| 137 | int ret; |
| 138 | char buf[BUF_SIZE]; |
| 139 | |
| 140 | FD_ZERO(&rfds); |
| 141 | FD_SET(wait_fd, &rfds); |
| 142 | |
| 143 | tv.tv_sec = 0; |
| 144 | tv.tv_nsec = timeout * MSEC_PER_NSEC; |
| 145 | |
| 146 | if (timeout > 0) { |
| 147 | ret = pselect(1, &rfds, NULL, NULL, &tv, NULL); |
| 148 | } else { |
| 149 | ret = pselect(1, &rfds, NULL, NULL, NULL, NULL); |
| 150 | } |
| 151 | |
| 152 | if (ret == -1) { |
| 153 | PERROR("pselect()"); |
| 154 | } else if (ret) { |
| 155 | ret = read(wait_fd, buf, BUF_SIZE); |
| 156 | if (ret < 0) { |
| 157 | PERROR("[pselect] read"); |
| 158 | } |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | static |
| 163 | void test_select(void) |
| 164 | { |
| 165 | fd_set rfds; |
| 166 | struct timeval tv; |
| 167 | int ret; |
| 168 | char buf[BUF_SIZE]; |
| 169 | |
| 170 | FD_ZERO(&rfds); |
| 171 | FD_SET(wait_fd, &rfds); |
| 172 | |
| 173 | tv.tv_sec = 0; |
| 174 | tv.tv_usec = timeout * MSEC_PER_USEC; |
| 175 | |
| 176 | if (timeout > 0) { |
| 177 | ret = select(1, &rfds, NULL, NULL, &tv); |
| 178 | } else { |
| 179 | ret = select(1, &rfds, NULL, NULL, NULL); |
| 180 | } |
| 181 | |
| 182 | if (ret == -1) { |
| 183 | PERROR("select()"); |
| 184 | } else if (ret) { |
| 185 | ret = read(wait_fd, buf, BUF_SIZE); |
| 186 | if (ret < 0) { |
| 187 | PERROR("[select] read"); |
| 188 | } |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | static |
| 193 | void test_poll(void) |
| 194 | { |
| 195 | struct pollfd ufds[NB_FD]; |
| 196 | char buf[BUF_SIZE]; |
| 197 | int ret; |
| 198 | |
| 199 | ufds[0].fd = wait_fd; |
| 200 | ufds[0].events = POLLIN|POLLPRI; |
| 201 | |
| 202 | ret = poll(ufds, 1, timeout); |
| 203 | |
| 204 | if (ret < 0) { |
| 205 | PERROR("poll"); |
| 206 | } else if (ret > 0) { |
| 207 | ret = read(wait_fd, buf, BUF_SIZE); |
| 208 | if (ret < 0) { |
| 209 | PERROR("[poll] read"); |
| 210 | } |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | static |
| 215 | void test_ppoll(void) |
| 216 | { |
| 217 | struct pollfd ufds[NB_FD]; |
| 218 | char buf[BUF_SIZE]; |
| 219 | int ret; |
| 220 | struct timespec ts; |
| 221 | |
| 222 | ufds[0].fd = wait_fd; |
| 223 | ufds[0].events = POLLIN|POLLPRI; |
| 224 | |
| 225 | if (timeout > 0) { |
| 226 | ts.tv_sec = 0; |
| 227 | ts.tv_nsec = timeout * MSEC_PER_NSEC; |
| 228 | ret = ppoll(ufds, 1, &ts, NULL); |
| 229 | } else { |
| 230 | ret = ppoll(ufds, 1, NULL, NULL); |
| 231 | } |
| 232 | |
| 233 | |
| 234 | if (ret < 0) { |
| 235 | PERROR("ppoll"); |
| 236 | } else if (ret > 0) { |
| 237 | ret = read(wait_fd, buf, BUF_SIZE); |
| 238 | if (ret < 0) { |
| 239 | PERROR("[ppoll] read"); |
| 240 | } |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | static |
| 245 | void test_ppoll_big(FILE *validation_output_file) |
| 246 | { |
| 247 | struct pollfd ufds[MAX_FDS]; |
| 248 | char buf[BUF_SIZE]; |
| 249 | int ret, i, fds[MAX_FDS]; |
| 250 | |
| 251 | for (i = 0; i < MAX_FDS; i++) { |
| 252 | fds[i] = dup(wait_fd); |
| 253 | if (fds[i] < 0) { |
| 254 | PERROR("dup"); |
| 255 | } |
| 256 | ufds[i].fd = fds[i]; |
| 257 | ufds[i].events = POLLIN|POLLPRI; |
| 258 | } |
| 259 | |
| 260 | ret = ppoll(ufds, MAX_FDS, NULL, NULL); |
| 261 | |
| 262 | if (ret < 0) { |
| 263 | PERROR("ppoll"); |
| 264 | } else if (ret > 0) { |
| 265 | ret = read(wait_fd, buf, BUF_SIZE); |
| 266 | if (ret < 0) { |
| 267 | PERROR("[ppoll] read"); |
| 268 | } |
| 269 | } |
| 270 | |
| 271 | for (i = 0; i < MAX_FDS; i++) { |
| 272 | ret = close(fds[i]); |
| 273 | if (ret != 0) { |
| 274 | PERROR("close"); |
| 275 | } |
| 276 | } |
| 277 | |
| 278 | return; |
| 279 | } |
| 280 | |
| 281 | static |
| 282 | void test_epoll(FILE *validation_output_file) |
| 283 | { |
| 284 | int ret, epollfd; |
| 285 | char buf[BUF_SIZE]; |
| 286 | struct epoll_event epoll_event; |
| 287 | |
| 288 | epollfd = epoll_create(NB_FD); |
| 289 | if (epollfd < 0) { |
| 290 | PERROR("[epoll] create"); |
| 291 | goto end; |
| 292 | } |
| 293 | |
| 294 | ret = fprintf(validation_output_file, |
| 295 | ", \"epoll_wait_fd\": %i", epollfd); |
| 296 | if (ret < 0) { |
| 297 | PERROR("[epoll] Failed to write test validation output"); |
| 298 | goto error; |
| 299 | } |
| 300 | |
| 301 | epoll_event.events = EPOLLIN | EPOLLPRI | EPOLLET; |
| 302 | epoll_event.data.fd = wait_fd; |
| 303 | ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, wait_fd, &epoll_event); |
| 304 | if (ret < 0) { |
| 305 | PERROR("[epoll] add"); |
| 306 | goto error; |
| 307 | } |
| 308 | |
| 309 | if (timeout > 0) { |
| 310 | ret = epoll_wait(epollfd, &epoll_event, 1, timeout); |
| 311 | } else { |
| 312 | ret = epoll_wait(epollfd, &epoll_event, 1, -1); |
| 313 | } |
| 314 | |
| 315 | if (ret == 1) { |
| 316 | ret = read(wait_fd, buf, BUF_SIZE); |
| 317 | if (ret < 0) { |
| 318 | PERROR("[epoll] read"); |
| 319 | } |
| 320 | } else if (ret != 0) { |
| 321 | PERROR("epoll_wait"); |
| 322 | } |
| 323 | |
| 324 | error: |
| 325 | ret = close(epollfd); |
| 326 | if (ret) { |
| 327 | PERROR("close"); |
| 328 | } |
| 329 | end: |
| 330 | return; |
| 331 | } |
| 332 | |
| 333 | static |
| 334 | void test_epoll_pwait(FILE *validation_output_file) |
| 335 | { |
| 336 | int ret, epollfd; |
| 337 | char buf[BUF_SIZE]; |
| 338 | struct epoll_event epoll_event; |
| 339 | |
| 340 | epollfd = epoll_create(NB_FD); |
| 341 | if (epollfd < 0) { |
| 342 | PERROR("[epoll_pwait] create"); |
| 343 | goto end; |
| 344 | } |
| 345 | |
| 346 | ret = fprintf(validation_output_file, |
| 347 | ", \"epoll_pwait_fd\": %i", epollfd); |
| 348 | if (ret < 0) { |
| 349 | PERROR("[epoll_pwait] Failed to write test validation output"); |
| 350 | goto error; |
| 351 | } |
| 352 | |
| 353 | epoll_event.events = EPOLLIN | EPOLLPRI | EPOLLET; |
| 354 | epoll_event.data.fd = wait_fd; |
| 355 | ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, wait_fd, &epoll_event); |
| 356 | if (ret < 0) { |
| 357 | PERROR("[epoll_pwait] add"); |
| 358 | goto error; |
| 359 | } |
| 360 | |
| 361 | if (timeout > 0) { |
| 362 | ret = epoll_pwait(epollfd, &epoll_event, 1, timeout, NULL); |
| 363 | } else { |
| 364 | ret = epoll_pwait(epollfd, &epoll_event, 1, -1, NULL); |
| 365 | } |
| 366 | |
| 367 | if (ret == 1) { |
| 368 | ret = read(wait_fd, buf, BUF_SIZE); |
| 369 | if (ret < 0) { |
| 370 | PERROR("[epoll_pwait] read"); |
| 371 | } |
| 372 | } else if (ret != 0) { |
| 373 | PERROR("epoll_pwait"); |
| 374 | } |
| 375 | |
| 376 | error: |
| 377 | ret = close(epollfd); |
| 378 | if (ret) { |
| 379 | PERROR("close"); |
| 380 | } |
| 381 | end: |
| 382 | return; |
| 383 | } |
| 384 | |
| 385 | static |
| 386 | void run_working_cases(FILE *validation_output_file) |
| 387 | { |
| 388 | int ret; |
| 389 | int pipe_fds[2]; |
| 390 | |
| 391 | if (timeout > 0) { |
| 392 | /* |
| 393 | * We need an input pipe for some cases and stdin might |
| 394 | * have random data, so we create a dummy pipe for this |
| 395 | * test to make sure we are running under clean conditions. |
| 396 | */ |
| 397 | ret = pipe(pipe_fds); |
| 398 | if (ret != 0) { |
| 399 | PERROR("pipe"); |
| 400 | goto end; |
| 401 | } |
| 402 | wait_fd = pipe_fds[0]; |
| 403 | } |
| 404 | test_select(); |
| 405 | test_pselect(); |
| 406 | test_select_big(); |
| 407 | test_poll(); |
| 408 | test_ppoll(); |
| 409 | |
| 410 | ret = fprintf(validation_output_file, "{ \"pid\": %i", getpid()); |
| 411 | if (ret < 0) { |
| 412 | PERROR("Failed to write pid to test validation file"); |
| 413 | goto end; |
| 414 | } |
| 415 | |
| 416 | test_epoll(validation_output_file); |
| 417 | test_epoll_pwait(validation_output_file); |
| 418 | |
| 419 | if (timeout > 0) { |
| 420 | ret = close(pipe_fds[0]); |
| 421 | if (ret) { |
| 422 | PERROR("close"); |
| 423 | } |
| 424 | ret = close(pipe_fds[1]); |
| 425 | if (ret) { |
| 426 | PERROR("close"); |
| 427 | } |
| 428 | } |
| 429 | |
| 430 | ret = fputs(" }", validation_output_file); |
| 431 | if (ret < 0) { |
| 432 | PERROR("Failed to close JSON dictionary in test validation file"); |
| 433 | goto end; |
| 434 | } |
| 435 | |
| 436 | end: |
| 437 | return; |
| 438 | } |
| 439 | |
| 440 | /* |
| 441 | * Ask for 100 FDs in a buffer for allocated for only 1 FD, should |
| 442 | * segfault (eventually with a "*** stack smashing detected ***" message). |
| 443 | * The event should contain an array of 100 FDs filled with garbage. |
| 444 | */ |
| 445 | static |
| 446 | void ppoll_fds_buffer_overflow(FILE *validation_output_file) |
| 447 | { |
| 448 | struct pollfd ufds[NB_FD]; |
| 449 | char buf[BUF_SIZE]; |
| 450 | int ret; |
| 451 | |
| 452 | ufds[0].fd = wait_fd; |
| 453 | ufds[0].events = POLLIN|POLLPRI; |
| 454 | |
| 455 | ret = syscall(SYS_ppoll, ufds, 100, NULL, NULL); |
| 456 | |
| 457 | if (ret < 0) { |
| 458 | PERROR("ppoll"); |
| 459 | } else if (ret > 0) { |
| 460 | ret = read(wait_fd, buf, BUF_SIZE); |
| 461 | if (ret < 0) { |
| 462 | PERROR("[ppoll] read"); |
| 463 | } |
| 464 | } |
| 465 | } |
| 466 | |
| 467 | /* |
| 468 | * Ask for ULONG_MAX FDs in a buffer for allocated for only 1 FD, should |
| 469 | * cleanly fail with a "Invalid argument". |
| 470 | * The event should contain an empty array of FDs and overflow = 1. |
| 471 | */ |
| 472 | static |
| 473 | void ppoll_fds_ulong_max(FILE *validation_output_file) |
| 474 | { |
| 475 | struct pollfd ufds[NB_FD]; |
| 476 | char buf[BUF_SIZE]; |
| 477 | int ret; |
| 478 | |
| 479 | ufds[0].fd = wait_fd; |
| 480 | ufds[0].events = POLLIN|POLLPRI; |
| 481 | |
| 482 | ret = syscall(SYS_ppoll, ufds, ULONG_MAX, NULL, NULL); |
| 483 | if (ret < 0) { |
| 484 | /* Expected error. */ |
| 485 | } else if (ret > 0) { |
| 486 | ret = read(wait_fd, buf, BUF_SIZE); |
| 487 | if (ret < 0) { |
| 488 | PERROR("[ppoll] read"); |
| 489 | } |
| 490 | } |
| 491 | } |
| 492 | |
| 493 | /* |
| 494 | * Pass an invalid file descriptor to pselect6(). The syscall should return |
| 495 | * -EBADF. The recorded event should contain a "ret = -EBADF (-9)". |
| 496 | */ |
| 497 | static |
| 498 | void pselect_invalid_fd(FILE *validation_output_file) |
| 499 | { |
| 500 | fd_set rfds; |
| 501 | int ret; |
| 502 | int fd; |
| 503 | char buf[BUF_SIZE]; |
| 504 | |
| 505 | /* |
| 506 | * Open a file, close it and use the closed FD in the pselect6 call. |
| 507 | */ |
| 508 | fd = open("/dev/null", O_RDONLY); |
| 509 | if (fd == -1) { |
| 510 | PERROR("open"); |
| 511 | goto error; |
| 512 | } |
| 513 | |
| 514 | ret = close(fd); |
| 515 | if (ret == -1) { |
| 516 | PERROR("close"); |
| 517 | goto error; |
| 518 | } |
| 519 | |
| 520 | FD_ZERO(&rfds); |
| 521 | FD_SET(fd, &rfds); |
| 522 | |
| 523 | ret = syscall(SYS_pselect6, fd + 1, &rfds, NULL, NULL, NULL, NULL); |
| 524 | if (ret == -1) { |
| 525 | /* Expected error. */ |
| 526 | } else if (ret) { |
| 527 | ret = read(wait_fd, buf, BUF_SIZE); |
| 528 | if (ret < 0) { |
| 529 | PERROR("[pselect] read"); |
| 530 | } |
| 531 | } |
| 532 | error: |
| 533 | return; |
| 534 | } |
| 535 | |
| 536 | /* |
| 537 | * Invalid pointer as writefds, should output a ppoll event |
| 538 | * with 0 FDs. |
| 539 | */ |
| 540 | static |
| 541 | void pselect_invalid_pointer(FILE *validation_output_file) |
| 542 | { |
| 543 | fd_set rfds; |
| 544 | int ret; |
| 545 | char buf[BUF_SIZE]; |
| 546 | void *invalid = (void *) 0x42; |
| 547 | |
| 548 | FD_ZERO(&rfds); |
| 549 | FD_SET(wait_fd, &rfds); |
| 550 | |
| 551 | ret = syscall(SYS_pselect6, 1, &rfds, (fd_set *) invalid, NULL, NULL, |
| 552 | NULL); |
| 553 | if (ret == -1) { |
| 554 | /* Expected error. */ |
| 555 | } else if (ret) { |
| 556 | ret = read(wait_fd, buf, BUF_SIZE); |
| 557 | if (ret < 0) { |
| 558 | PERROR("[pselect] read"); |
| 559 | } |
| 560 | } |
| 561 | } |
| 562 | |
| 563 | /* |
| 564 | * Pass an invalid pointer to epoll_pwait, should fail with |
| 565 | * "Bad address", the event returns 0 FDs. |
| 566 | */ |
| 567 | static |
| 568 | void epoll_pwait_invalid_pointer(FILE *validation_output_file) |
| 569 | { |
| 570 | int ret, epollfd; |
| 571 | char buf[BUF_SIZE]; |
| 572 | struct epoll_event epoll_event; |
| 573 | void *invalid = (void *) 0x42; |
| 574 | |
| 575 | epollfd = epoll_create(NB_FD); |
| 576 | if (epollfd < 0) { |
| 577 | PERROR("[epoll_pwait] create"); |
| 578 | goto end; |
| 579 | } |
| 580 | |
| 581 | ret = fprintf(validation_output_file, |
| 582 | "{ \"epollfd\": %i, \"pid\": %i }", epollfd, |
| 583 | getpid()); |
| 584 | if (ret < 0) { |
| 585 | PERROR("[epoll_pwait] Failed to write test validation output"); |
| 586 | goto error; |
| 587 | } |
| 588 | |
| 589 | epoll_event.events = EPOLLIN | EPOLLPRI | EPOLLET; |
| 590 | epoll_event.data.fd = wait_fd; |
| 591 | ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, wait_fd, &epoll_event); |
| 592 | if (ret < 0) { |
| 593 | PERROR("[epoll_pwait] add"); |
| 594 | goto error; |
| 595 | } |
| 596 | |
| 597 | ret = syscall(SYS_epoll_pwait, epollfd, |
| 598 | (struct epoll_event *) invalid, 1, -1, NULL); |
| 599 | |
| 600 | if (ret == 1) { |
| 601 | ret = read(wait_fd, buf, BUF_SIZE); |
| 602 | if (ret < 0) { |
| 603 | PERROR("[epoll_pwait] read"); |
| 604 | } |
| 605 | } else if (ret != 0) { |
| 606 | /* Expected error. */ |
| 607 | } |
| 608 | |
| 609 | error: |
| 610 | ret = close(epollfd); |
| 611 | if (ret) { |
| 612 | PERROR("close"); |
| 613 | } |
| 614 | end: |
| 615 | return; |
| 616 | } |
| 617 | |
| 618 | /* |
| 619 | * Set maxevents to INT_MAX, should output "Invalid argument" |
| 620 | * The event should return an empty array. |
| 621 | */ |
| 622 | static |
| 623 | void epoll_pwait_int_max(FILE *validation_output_file) |
| 624 | { |
| 625 | int ret, epollfd; |
| 626 | char buf[BUF_SIZE]; |
| 627 | struct epoll_event epoll_event; |
| 628 | |
| 629 | epollfd = epoll_create(NB_FD); |
| 630 | if (epollfd < 0) { |
| 631 | PERROR("[epoll_pwait] create"); |
| 632 | goto end; |
| 633 | } |
| 634 | |
| 635 | ret = fprintf(validation_output_file, |
| 636 | "{ \"epollfd\": %i, \"pid\": %i }", epollfd, |
| 637 | getpid()); |
| 638 | if (ret < 0) { |
| 639 | PERROR("[epoll_pwait] Failed to write test validation output"); |
| 640 | goto error; |
| 641 | } |
| 642 | |
| 643 | epoll_event.events = EPOLLIN | EPOLLPRI | EPOLLET; |
| 644 | epoll_event.data.fd = wait_fd; |
| 645 | ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, wait_fd, &epoll_event); |
| 646 | if (ret < 0) { |
| 647 | PERROR("[epoll_pwait] add"); |
| 648 | goto error; |
| 649 | } |
| 650 | |
| 651 | ret = syscall(SYS_epoll_pwait, epollfd, &epoll_event, INT_MAX, -1, |
| 652 | NULL); |
| 653 | |
| 654 | if (ret == 1) { |
| 655 | ret = read(wait_fd, buf, BUF_SIZE); |
| 656 | if (ret < 0) { |
| 657 | PERROR("[epoll_pwait] read"); |
| 658 | } |
| 659 | } else if (ret != 0) { |
| 660 | /* Expected error. */ |
| 661 | } |
| 662 | |
| 663 | error: |
| 664 | ret = close(epollfd); |
| 665 | if (ret) { |
| 666 | PERROR("close"); |
| 667 | } |
| 668 | end: |
| 669 | return; |
| 670 | } |
| 671 | |
| 672 | static |
| 673 | void *ppoll_writer(void *arg) |
| 674 | { |
| 675 | struct ppoll_thread_data *data = (struct ppoll_thread_data *) arg; |
| 676 | |
| 677 | while (!stop_thread) { |
| 678 | memset(data->ufds, data->value, |
| 679 | MAX_FDS * sizeof(struct pollfd)); |
| 680 | usleep(100); |
| 681 | } |
| 682 | |
| 683 | return NULL; |
| 684 | } |
| 685 | |
| 686 | static |
| 687 | void do_ppoll(int *fds, struct pollfd *ufds) |
| 688 | { |
| 689 | int i, ret; |
| 690 | struct timespec ts; |
| 691 | char buf[BUF_SIZE]; |
| 692 | |
| 693 | ts.tv_sec = 0; |
| 694 | ts.tv_nsec = 1 * MSEC_PER_NSEC; |
| 695 | |
| 696 | for (i = 0; i < MAX_FDS; i++) { |
| 697 | ufds[i].fd = fds[i]; |
| 698 | ufds[i].events = POLLIN|POLLPRI; |
| 699 | } |
| 700 | |
| 701 | ret = ppoll(ufds, MAX_FDS, &ts, NULL); |
| 702 | |
| 703 | if (ret < 0) { |
| 704 | PERROR("ppoll"); |
| 705 | } else if (ret > 0) { |
| 706 | ret = read(wait_fd, buf, BUF_SIZE); |
| 707 | if (ret < 0) { |
| 708 | PERROR("[ppoll] read"); |
| 709 | } |
| 710 | } |
| 711 | } |
| 712 | |
| 713 | static |
| 714 | void stress_ppoll(int *fds, int value) |
| 715 | { |
| 716 | pthread_t writer; |
| 717 | int iter, ret; |
| 718 | struct ppoll_thread_data thread_data; |
| 719 | struct pollfd ufds[MAX_FDS]; |
| 720 | |
| 721 | thread_data.ufds = ufds; |
| 722 | thread_data.value = value; |
| 723 | |
| 724 | stop_thread = 0; |
| 725 | ret = pthread_create(&writer, NULL, &ppoll_writer, (void *) &thread_data); |
| 726 | if (ret != 0) { |
| 727 | fprintf(stderr, "[error] pthread_create\n"); |
| 728 | goto end; |
| 729 | } |
| 730 | for (iter = 0; iter < NR_ITER; iter++) { |
| 731 | do_ppoll(fds, ufds); |
| 732 | } |
| 733 | stop_thread = 1; |
| 734 | ret = pthread_join(writer, NULL); |
| 735 | if (ret) { |
| 736 | fprintf(stderr, "[error] pthread_join\n"); |
| 737 | goto end; |
| 738 | } |
| 739 | end: |
| 740 | return; |
| 741 | } |
| 742 | |
| 743 | /* |
| 744 | * 3 rounds of NR_ITER iterations with concurrent updates of the pollfd |
| 745 | * structure: |
| 746 | * - memset to 0 |
| 747 | * - memset to 1 |
| 748 | * - memset to INT_MAX |
| 749 | * Waits for input, but also set a timeout in case the input FD is overwritten |
| 750 | * before entering in the syscall. We use MAX_FDS FDs (dup of stdin), so the |
| 751 | * resulting trace is big (20MB). |
| 752 | * |
| 753 | * ppoll should work as expected and the trace should be readable at the end. |
| 754 | */ |
| 755 | static |
| 756 | void ppoll_concurrent_write(FILE *validation_output_file) |
| 757 | { |
| 758 | int i, ret, fds[MAX_FDS]; |
| 759 | |
| 760 | for (i = 0; i < MAX_FDS; i++) { |
| 761 | fds[i] = dup(wait_fd); |
| 762 | if (fds[i] < 0) { |
| 763 | PERROR("dup"); |
| 764 | } |
| 765 | } |
| 766 | |
| 767 | stress_ppoll(fds, 0); |
| 768 | stress_ppoll(fds, 1); |
| 769 | stress_ppoll(fds, INT_MAX); |
| 770 | |
| 771 | for (i = 0; i < MAX_FDS; i++) { |
| 772 | ret = close(fds[i]); |
| 773 | if (ret != 0) { |
| 774 | PERROR("close"); |
| 775 | } |
| 776 | } |
| 777 | |
| 778 | return; |
| 779 | } |
| 780 | |
| 781 | static |
| 782 | void *epoll_pwait_writer(void *addr) |
| 783 | { |
| 784 | srand(time(NULL)); |
| 785 | |
| 786 | while (!stop_thread) { |
| 787 | usleep(rand() % 30); |
| 788 | munmap(addr, MAX_FDS * sizeof(struct epoll_event)); |
| 789 | } |
| 790 | |
| 791 | return NULL; |
| 792 | } |
| 793 | |
| 794 | /* |
| 795 | * epoll_pwait on MAX_FDS fds while a concurrent thread munmaps the |
| 796 | * buffer allocated for the returned data. This should randomly segfault. |
| 797 | * The trace should be readable and no kernel OOPS should occur. |
| 798 | */ |
| 799 | static |
| 800 | void epoll_pwait_concurrent_munmap(FILE *validation_output_file) |
| 801 | { |
| 802 | int ret, epollfd, i, fds[MAX_FDS]; |
| 803 | char buf[BUF_SIZE]; |
| 804 | struct epoll_event *epoll_event; |
| 805 | pthread_t writer; |
| 806 | |
| 807 | for (i = 0; i < MAX_FDS; i++) { |
| 808 | fds[i] = -1; |
| 809 | } |
| 810 | epollfd = epoll_create(MAX_FDS); |
| 811 | if (epollfd < 0) { |
| 812 | PERROR("[epoll_pwait] create"); |
| 813 | goto end; |
| 814 | } |
| 815 | |
| 816 | ret = fprintf(validation_output_file, |
| 817 | "{ \"epollfd\": %i, \"pid\": %i }", epollfd, |
| 818 | getpid()); |
| 819 | if (ret < 0) { |
| 820 | PERROR("[epoll_pwait] Failed to write test validation output"); |
| 821 | goto error; |
| 822 | } |
| 823 | |
| 824 | epoll_event = (struct epoll_event *) mmap(NULL, |
| 825 | MAX_FDS * sizeof(struct epoll_event), |
| 826 | PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, |
| 827 | 0); |
| 828 | if (epoll_event == MAP_FAILED) { |
| 829 | PERROR("mmap"); |
| 830 | goto error; |
| 831 | } |
| 832 | |
| 833 | for (i = 0; i < MAX_FDS; i++) { |
| 834 | fds[i] = dup(wait_fd); |
| 835 | if (fds[i] < 0) { |
| 836 | PERROR("dup"); |
| 837 | } |
| 838 | epoll_event[i].events = EPOLLIN | EPOLLPRI | EPOLLET; |
| 839 | epoll_event[i].data.fd = fds[i]; |
| 840 | ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, fds[i], epoll_event); |
| 841 | if (ret < 0) { |
| 842 | PERROR("[epoll_pwait] add"); |
| 843 | goto error_unmap; |
| 844 | } |
| 845 | } |
| 846 | stop_thread = 0; |
| 847 | ret = pthread_create(&writer, NULL, &epoll_pwait_writer, |
| 848 | (void *) epoll_event); |
| 849 | if (ret != 0) { |
| 850 | fprintf(stderr, "[error] pthread_create\n"); |
| 851 | goto error_unmap; |
| 852 | } |
| 853 | |
| 854 | ret = epoll_pwait(epollfd, epoll_event, 1, 1, NULL); |
| 855 | |
| 856 | if (ret == 1) { |
| 857 | ret = read(wait_fd, buf, BUF_SIZE); |
| 858 | if (ret < 0) { |
| 859 | PERROR("[epoll_pwait] read"); |
| 860 | } |
| 861 | } else if (ret != 0) { |
| 862 | /* Expected error. */ |
| 863 | } |
| 864 | |
| 865 | stop_thread = 1; |
| 866 | ret = pthread_join(writer, NULL); |
| 867 | if (ret) { |
| 868 | fprintf(stderr, "[error] pthread_join\n"); |
| 869 | goto error_unmap; |
| 870 | } |
| 871 | error_unmap: |
| 872 | for (i = 0; i < MAX_FDS; i++) { |
| 873 | ret = close(fds[i]); |
| 874 | if (ret != 0) { |
| 875 | PERROR("close"); |
| 876 | } |
| 877 | } |
| 878 | |
| 879 | ret = munmap(epoll_event, MAX_FDS * sizeof(struct epoll_event)); |
| 880 | if (ret != 0) { |
| 881 | PERROR("munmap"); |
| 882 | } |
| 883 | |
| 884 | error: |
| 885 | ret = close(epollfd); |
| 886 | if (ret) { |
| 887 | PERROR("close"); |
| 888 | } |
| 889 | end: |
| 890 | return; |
| 891 | } |
| 892 | |
| 893 | static |
| 894 | void print_list(void) |
| 895 | { |
| 896 | fprintf(stderr, "Test list (-t X):\n"); |
| 897 | fprintf(stderr, "\t1: Working cases for select, pselect6, poll, ppoll " |
| 898 | "and epoll, waiting for input\n"); |
| 899 | fprintf(stderr, "\t2: Timeout cases (1ms) for select, pselect6, poll, " |
| 900 | "ppoll and epoll\n"); |
| 901 | fprintf(stderr, "\t3: pselect with an invalid fd\n"); |
| 902 | fprintf(stderr, "\t4: ppoll with %d FDs\n", MAX_FDS); |
| 903 | fprintf(stderr, "\t5: ppoll buffer overflow, should segfault, waits " |
| 904 | "for input\n"); |
| 905 | fprintf(stderr, "\t6: pselect with an invalid pointer, waits for " |
| 906 | "input\n"); |
| 907 | fprintf(stderr, "\t7: ppoll with ulong_max fds, waits for input\n"); |
| 908 | fprintf(stderr, "\t8: epoll_pwait with an invalid pointer, waits for " |
| 909 | "input\n"); |
| 910 | fprintf(stderr, "\t9: epoll_pwait with maxevents set to INT_MAX, " |
| 911 | "waits for input\n"); |
| 912 | fprintf(stderr, "\t10: ppoll with concurrent updates of the structure " |
| 913 | "from user-space, stress test (3000 iterations), " |
| 914 | "waits for input + timeout 1ms\n"); |
| 915 | fprintf(stderr, "\t11: epoll_pwait with concurrent munmap of the buffer " |
| 916 | "from user-space, should randomly segfault, run " |
| 917 | "multiple times, waits for input + timeout 1ms\n"); |
| 918 | } |
| 919 | |
| 920 | int main(int argc, const char **argv) |
| 921 | { |
| 922 | int c, ret, test = -1; |
| 923 | poptContext optCon; |
| 924 | struct rlimit open_lim; |
| 925 | FILE *test_validation_output_file = NULL; |
| 926 | const char *test_validation_output_file_path = NULL; |
| 927 | struct poptOption optionsTable[] = { |
| 928 | { "test", 't', POPT_ARG_INT, &test, 0, |
| 929 | "Test to run", NULL }, |
| 930 | { "list", 'l', 0, 0, 'l', |
| 931 | "List of tests (-t X)", NULL }, |
| 932 | { "validation-file", 'o', POPT_ARG_STRING, &test_validation_output_file_path, 0, |
| 933 | "Test case output", NULL }, |
| 934 | POPT_AUTOHELP |
| 935 | { NULL, 0, 0, NULL, 0 } |
| 936 | }; |
| 937 | const struct test_case *test_case; |
| 938 | |
| 939 | optCon = poptGetContext(NULL, argc, argv, optionsTable, 0); |
| 940 | |
| 941 | if (argc < 2) { |
| 942 | poptPrintUsage(optCon, stderr, 0); |
| 943 | ret = -1; |
| 944 | goto end; |
| 945 | } |
| 946 | |
| 947 | ret = 0; |
| 948 | |
| 949 | while ((c = poptGetNextOpt(optCon)) >= 0) { |
| 950 | switch (c) { |
| 951 | case 'l': |
| 952 | print_list(); |
| 953 | goto end; |
| 954 | } |
| 955 | } |
| 956 | |
| 957 | if (!test_validation_output_file_path) { |
| 958 | fprintf(stderr, "A test validation file path is required (--validation-file/-o)\n"); |
| 959 | ret = -1; |
| 960 | goto end; |
| 961 | } |
| 962 | |
| 963 | test_validation_output_file = fopen(test_validation_output_file_path, "w+"); |
| 964 | if (!test_validation_output_file) { |
| 965 | PERROR("Failed to create test validation output file at '%s'", |
| 966 | test_validation_output_file_path); |
| 967 | ret = -1; |
| 968 | goto end; |
| 969 | } |
| 970 | |
| 971 | open_lim.rlim_cur = MAX_FDS + MIN_NR_FDS; |
| 972 | open_lim.rlim_max = MAX_FDS + MIN_NR_FDS; |
| 973 | |
| 974 | ret = setrlimit(RLIMIT_NOFILE, &open_lim); |
| 975 | if (ret < 0) { |
| 976 | PERROR("setrlimit"); |
| 977 | goto end; |
| 978 | } |
| 979 | |
| 980 | /* |
| 981 | * Some tests might segfault, but we need the getpid() to be output |
| 982 | * for the validation, disabling the buffering on the validation file |
| 983 | * works. |
| 984 | */ |
| 985 | setbuf(test_validation_output_file, NULL); |
| 986 | wait_fd = STDIN_FILENO; |
| 987 | |
| 988 | /* Test case id is 1-based. */ |
| 989 | if (test < 1 || test > ARRAY_SIZE(test_cases)) { |
| 990 | poptPrintUsage(optCon, stderr, 0); |
| 991 | ret = -1; |
| 992 | } |
| 993 | |
| 994 | test_case = &test_cases[test - 1]; |
| 995 | |
| 996 | timeout = test_case->timeout; |
| 997 | if (!test_case->produces_validation_info) { |
| 998 | /* |
| 999 | * All test cases need to provide, at minimum, the pid of the |
| 1000 | * test application. |
| 1001 | */ |
| 1002 | ret = fprintf(test_validation_output_file, "{ \"pid\": %i }", getpid()); |
| 1003 | if (ret < 0) { |
| 1004 | PERROR("Failed to write application pid to test validation file"); |
| 1005 | goto end; |
| 1006 | } |
| 1007 | } |
| 1008 | |
| 1009 | test_case->run(test_validation_output_file); |
| 1010 | |
| 1011 | end: |
| 1012 | if (test_validation_output_file) { |
| 1013 | const int close_ret = fclose(test_validation_output_file); |
| 1014 | |
| 1015 | if (close_ret) { |
| 1016 | PERROR("Failed to close test output file"); |
| 1017 | } |
| 1018 | } |
| 1019 | poptFreeContext(optCon); |
| 1020 | return ret; |
| 1021 | } |