1 /* 2 * Copyright (c) 2014 The FreeBSD Foundation. 3 * Copyright (C) 2005 David Xu <davidxu@freebsd.org>. 4 * Copyright (c) 2003 Daniel Eischen <deischen@freebsd.org>. 5 * Copyright (C) 2000 Jason Evans <jasone@freebsd.org>. 6 * All rights reserved. 7 * 8 * Portions of this software were developed by Konstantin Belousov 9 * under sponsorship from the FreeBSD Foundation. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice(s), this list of conditions and the following disclaimer as 16 * the first lines of this file unmodified other than the possible 17 * addition of one or more copyright notices. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice(s), this list of conditions and the following disclaimer in 20 * the documentation and/or other materials provided with the 21 * distribution. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY 24 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE 27 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 32 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 33 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /*- 37 * SPDX-License-Identifier: BSD-3-Clause 38 * 39 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au> 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. Neither the name of the author nor the names of any co-contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 */ 67 68 #include <sys/cdefs.h> 69 #include "namespace.h" 70 #include <sys/types.h> 71 #include <sys/mman.h> 72 #include <sys/param.h> 73 #include <sys/select.h> 74 #include <sys/signalvar.h> 75 #include <sys/socket.h> 76 #include <sys/stat.h> 77 #include <sys/time.h> 78 #include <sys/uio.h> 79 #include <sys/wait.h> 80 #include <aio.h> 81 #include <dirent.h> 82 #include <errno.h> 83 #include <fcntl.h> 84 #include <poll.h> 85 #include <signal.h> 86 #include <stdarg.h> 87 #include <stdio.h> 88 #include <stdlib.h> 89 #include <string.h> 90 #include <termios.h> 91 #include <unistd.h> 92 #include <pthread.h> 93 #include "un-namespace.h" 94 95 #include "libc_private.h" 96 #include "thr_private.h" 97 98 static int 99 __thr_accept(int s, struct sockaddr *addr, socklen_t *addrlen) 100 { 101 struct pthread *curthread; 102 int ret; 103 104 curthread = _get_curthread(); 105 _thr_cancel_enter(curthread); 106 ret = __sys_accept(s, addr, addrlen); 107 _thr_cancel_leave(curthread, ret == -1); 108 109 return (ret); 110 } 111 112 /* 113 * Cancellation behavior: 114 * If thread is canceled, no socket is created. 115 */ 116 static int 117 __thr_accept4(int s, struct sockaddr *addr, socklen_t *addrlen, int flags) 118 { 119 struct pthread *curthread; 120 int ret; 121 122 curthread = _get_curthread(); 123 _thr_cancel_enter(curthread); 124 ret = __sys_accept4(s, addr, addrlen, flags); 125 _thr_cancel_leave(curthread, ret == -1); 126 127 return (ret); 128 } 129 130 static int 131 __thr_aio_suspend(const struct aiocb * const iocbs[], int niocb, const struct 132 timespec *timeout) 133 { 134 struct pthread *curthread; 135 int ret; 136 137 curthread = _get_curthread(); 138 _thr_cancel_enter(curthread); 139 ret = __sys_aio_suspend(iocbs, niocb, timeout); 140 _thr_cancel_leave(curthread, 1); 141 142 return (ret); 143 } 144 145 /* 146 * Cancellation behavior: 147 * According to manual of close(), the file descriptor is always deleted. 148 * Here, thread is only canceled after the system call, so the file 149 * descriptor is always deleted despite whether the thread is canceled 150 * or not. 151 */ 152 static int 153 __thr_close(int fd) 154 { 155 struct pthread *curthread; 156 int ret; 157 158 curthread = _get_curthread(); 159 _thr_cancel_enter2(curthread, 0); 160 ret = __sys_close(fd); 161 _thr_cancel_leave(curthread, 1); 162 163 return (ret); 164 } 165 166 /* 167 * Cancellation behavior: 168 * If the thread is canceled, connection is not made. 169 */ 170 static int 171 __thr_connect(int fd, const struct sockaddr *name, socklen_t namelen) 172 { 173 struct pthread *curthread; 174 int ret; 175 176 curthread = _get_curthread(); 177 _thr_cancel_enter(curthread); 178 ret = __sys_connect(fd, name, namelen); 179 _thr_cancel_leave(curthread, ret == -1); 180 181 return (ret); 182 } 183 184 /* 185 * Cancellation behavior: 186 * According to specification, only F_SETLKW is a cancellation point. 187 * Thread is only canceled at start, or canceled if the system call 188 * is failure, this means the function does not generate side effect 189 * if it is canceled. 190 */ 191 static int 192 __thr_fcntl(int fd, int cmd, ...) 193 { 194 struct pthread *curthread; 195 int ret; 196 va_list ap; 197 198 curthread = _get_curthread(); 199 va_start(ap, cmd); 200 if (cmd == F_OSETLKW || cmd == F_SETLKW) { 201 _thr_cancel_enter(curthread); 202 ret = __sys_fcntl(fd, cmd, va_arg(ap, void *)); 203 _thr_cancel_leave(curthread, ret == -1); 204 } else { 205 ret = __sys_fcntl(fd, cmd, va_arg(ap, void *)); 206 } 207 va_end(ap); 208 209 return (ret); 210 } 211 212 /* 213 * Cancellation behavior: 214 * Thread may be canceled after system call. 215 */ 216 static int 217 __thr_fsync(int fd) 218 { 219 struct pthread *curthread; 220 int ret; 221 222 curthread = _get_curthread(); 223 _thr_cancel_enter2(curthread, 0); 224 ret = __sys_fsync(fd); 225 _thr_cancel_leave(curthread, 1); 226 227 return (ret); 228 } 229 230 static int 231 __thr_fdatasync(int fd) 232 { 233 struct pthread *curthread; 234 int ret; 235 236 curthread = _get_curthread(); 237 _thr_cancel_enter2(curthread, 0); 238 ret = __sys_fdatasync(fd); 239 _thr_cancel_leave(curthread, 1); 240 241 return (ret); 242 } 243 244 /* 245 * Cancellation behavior: 246 * Thread may be canceled after system call. 247 */ 248 static int 249 __thr_msync(void *addr, size_t len, int flags) 250 { 251 struct pthread *curthread; 252 int ret; 253 254 curthread = _get_curthread(); 255 _thr_cancel_enter2(curthread, 0); 256 ret = __sys_msync(addr, len, flags); 257 _thr_cancel_leave(curthread, 1); 258 259 return (ret); 260 } 261 262 static int 263 __thr_clock_nanosleep(clockid_t clock_id, int flags, 264 const struct timespec *time_to_sleep, struct timespec *time_remaining) 265 { 266 struct pthread *curthread; 267 int ret; 268 269 curthread = _get_curthread(); 270 _thr_cancel_enter(curthread); 271 ret = __sys_clock_nanosleep(clock_id, flags, time_to_sleep, 272 time_remaining); 273 _thr_cancel_leave(curthread, 1); 274 275 return (ret); 276 } 277 278 static int 279 __thr_nanosleep(const struct timespec *time_to_sleep, 280 struct timespec *time_remaining) 281 { 282 struct pthread *curthread; 283 int ret; 284 285 curthread = _get_curthread(); 286 _thr_cancel_enter(curthread); 287 ret = __sys_nanosleep(time_to_sleep, time_remaining); 288 _thr_cancel_leave(curthread, 1); 289 290 return (ret); 291 } 292 293 /* 294 * Cancellation behavior: 295 * If the thread is canceled, file is not opened. 296 */ 297 static int 298 __thr_openat(int fd, const char *path, int flags, ...) 299 { 300 struct pthread *curthread; 301 int mode, ret; 302 va_list ap; 303 304 305 /* Check if the file is being created: */ 306 if ((flags & O_CREAT) != 0) { 307 /* Get the creation mode: */ 308 va_start(ap, flags); 309 mode = va_arg(ap, int); 310 va_end(ap); 311 } else { 312 mode = 0; 313 } 314 315 curthread = _get_curthread(); 316 _thr_cancel_enter(curthread); 317 ret = __sys_openat(fd, path, flags, mode); 318 _thr_cancel_leave(curthread, ret == -1); 319 320 return (ret); 321 } 322 323 /* 324 * Cancellation behavior: 325 * Thread may be canceled at start, but if the system call returns something, 326 * the thread is not canceled. 327 */ 328 static int 329 __thr_poll(struct pollfd *fds, unsigned int nfds, int timeout) 330 { 331 struct pthread *curthread; 332 int ret; 333 334 curthread = _get_curthread(); 335 _thr_cancel_enter(curthread); 336 ret = __sys_poll(fds, nfds, timeout); 337 _thr_cancel_leave(curthread, ret == -1); 338 339 return (ret); 340 } 341 342 /* 343 * Cancellation behavior: 344 * Thread may be canceled at start, but if the system call returns something, 345 * the thread is not canceled. 346 */ 347 static int 348 __thr_ppoll(struct pollfd pfd[], nfds_t nfds, const struct timespec * 349 timeout, const sigset_t *newsigmask) 350 { 351 struct pthread *curthread; 352 int ret; 353 354 curthread = _get_curthread(); 355 _thr_cancel_enter(curthread); 356 ret = __sys_ppoll(pfd, nfds, timeout, newsigmask); 357 _thr_cancel_leave(curthread, ret == -1); 358 359 return (ret); 360 } 361 362 /* 363 * Cancellation behavior: 364 * Thread may be canceled at start, but if the system call returns something, 365 * the thread is not canceled. 366 */ 367 static int 368 __thr_pselect(int count, fd_set *rfds, fd_set *wfds, fd_set *efds, 369 const struct timespec *timo, const sigset_t *mask) 370 { 371 struct pthread *curthread; 372 int ret; 373 374 curthread = _get_curthread(); 375 _thr_cancel_enter(curthread); 376 ret = __sys_pselect(count, rfds, wfds, efds, timo, mask); 377 _thr_cancel_leave(curthread, ret == -1); 378 379 return (ret); 380 } 381 382 static int 383 __thr_kevent(int kq, const struct kevent *changelist, int nchanges, 384 struct kevent *eventlist, int nevents, const struct timespec *timeout) 385 { 386 struct pthread *curthread; 387 int ret; 388 389 if (nevents == 0) { 390 /* 391 * No blocking, do not make the call cancellable. 392 */ 393 return (__sys_kevent(kq, changelist, nchanges, eventlist, 394 nevents, timeout)); 395 } 396 curthread = _get_curthread(); 397 _thr_cancel_enter(curthread); 398 ret = __sys_kevent(kq, changelist, nchanges, eventlist, nevents, 399 timeout); 400 _thr_cancel_leave(curthread, ret == -1 && nchanges == 0); 401 402 return (ret); 403 } 404 405 /* 406 * Cancellation behavior: 407 * Thread may be canceled at start, but if the system call got some data, 408 * the thread is not canceled. 409 */ 410 static ssize_t 411 __thr_read(int fd, void *buf, size_t nbytes) 412 { 413 struct pthread *curthread; 414 ssize_t ret; 415 416 curthread = _get_curthread(); 417 _thr_cancel_enter(curthread); 418 ret = __sys_read(fd, buf, nbytes); 419 _thr_cancel_leave(curthread, ret == -1); 420 421 return (ret); 422 } 423 424 /* 425 * Cancellation behavior: 426 * Thread may be canceled at start, but if the system call got some data, 427 * the thread is not canceled. 428 */ 429 static ssize_t 430 __thr_readv(int fd, const struct iovec *iov, int iovcnt) 431 { 432 struct pthread *curthread; 433 ssize_t ret; 434 435 curthread = _get_curthread(); 436 _thr_cancel_enter(curthread); 437 ret = __sys_readv(fd, iov, iovcnt); 438 _thr_cancel_leave(curthread, ret == -1); 439 return (ret); 440 } 441 442 /* 443 * Cancellation behavior: 444 * Thread may be canceled at start, but if the system call got some data, 445 * the thread is not canceled. 446 */ 447 static ssize_t 448 __thr_recvfrom(int s, void *b, size_t l, int f, struct sockaddr *from, 449 socklen_t *fl) 450 { 451 struct pthread *curthread; 452 ssize_t ret; 453 454 curthread = _get_curthread(); 455 _thr_cancel_enter(curthread); 456 ret = __sys_recvfrom(s, b, l, f, from, fl); 457 _thr_cancel_leave(curthread, ret == -1); 458 return (ret); 459 } 460 461 /* 462 * Cancellation behavior: 463 * Thread may be canceled at start, but if the system call got some data, 464 * the thread is not canceled. 465 */ 466 static ssize_t 467 __thr_recvmsg(int s, struct msghdr *m, int f) 468 { 469 struct pthread *curthread; 470 ssize_t ret; 471 472 curthread = _get_curthread(); 473 _thr_cancel_enter(curthread); 474 ret = __sys_recvmsg(s, m, f); 475 _thr_cancel_leave(curthread, ret == -1); 476 return (ret); 477 } 478 479 /* 480 * Cancellation behavior: 481 * Thread may be canceled at start, but if the system call returns something, 482 * the thread is not canceled. 483 */ 484 static int 485 __thr_select(int numfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, 486 struct timeval *timeout) 487 { 488 struct pthread *curthread; 489 int ret; 490 491 curthread = _get_curthread(); 492 _thr_cancel_enter(curthread); 493 ret = __sys_select(numfds, readfds, writefds, exceptfds, timeout); 494 _thr_cancel_leave(curthread, ret == -1); 495 return (ret); 496 } 497 498 /* 499 * Cancellation behavior: 500 * Thread may be canceled at start, but if the system call sent 501 * data, the thread is not canceled. 502 */ 503 static ssize_t 504 __thr_sendmsg(int s, const struct msghdr *m, int f) 505 { 506 struct pthread *curthread; 507 ssize_t ret; 508 509 curthread = _get_curthread(); 510 _thr_cancel_enter(curthread); 511 ret = __sys_sendmsg(s, m, f); 512 _thr_cancel_leave(curthread, ret <= 0); 513 return (ret); 514 } 515 516 /* 517 * Cancellation behavior: 518 * Thread may be canceled at start, but if the system call sent some 519 * data, the thread is not canceled. 520 */ 521 static ssize_t 522 __thr_sendto(int s, const void *m, size_t l, int f, const struct sockaddr *t, 523 socklen_t tl) 524 { 525 struct pthread *curthread; 526 ssize_t ret; 527 528 curthread = _get_curthread(); 529 _thr_cancel_enter(curthread); 530 ret = __sys_sendto(s, m, l, f, t, tl); 531 _thr_cancel_leave(curthread, ret <= 0); 532 return (ret); 533 } 534 535 static int 536 __thr_system(const char *string) 537 { 538 struct pthread *curthread; 539 int ret; 540 541 curthread = _get_curthread(); 542 _thr_cancel_enter(curthread); 543 ret = __libc_system(string); 544 _thr_cancel_leave(curthread, 1); 545 return (ret); 546 } 547 548 /* 549 * Cancellation behavior: 550 * If thread is canceled, the system call is not completed, 551 * this means not all bytes were drained. 552 */ 553 static int 554 __thr_tcdrain(int fd) 555 { 556 struct pthread *curthread; 557 int ret; 558 559 curthread = _get_curthread(); 560 _thr_cancel_enter(curthread); 561 ret = __libc_tcdrain(fd); 562 _thr_cancel_leave(curthread, ret == -1); 563 return (ret); 564 } 565 566 /* 567 * Cancellation behavior: 568 * Thread may be canceled at start, but if the system call returns 569 * a child pid, the thread is not canceled. 570 */ 571 static pid_t 572 __thr_wait4(pid_t pid, int *status, int options, struct rusage *rusage) 573 { 574 struct pthread *curthread; 575 pid_t ret; 576 577 curthread = _get_curthread(); 578 _thr_cancel_enter(curthread); 579 ret = __sys_wait4(pid, status, options, rusage); 580 _thr_cancel_leave(curthread, ret <= 0); 581 return (ret); 582 } 583 584 /* 585 * Cancellation behavior: 586 * Thread may be canceled at start, but if the system call returns 587 * a child pid, the thread is not canceled. 588 */ 589 static pid_t 590 __thr_wait6(idtype_t idtype, id_t id, int *status, int options, 591 struct __wrusage *ru, siginfo_t *infop) 592 { 593 struct pthread *curthread; 594 pid_t ret; 595 596 curthread = _get_curthread(); 597 _thr_cancel_enter(curthread); 598 ret = __sys_wait6(idtype, id, status, options, ru, infop); 599 _thr_cancel_leave(curthread, ret <= 0); 600 return (ret); 601 } 602 603 /* 604 * Cancellation behavior: 605 * Thread may be canceled at start, but if the thread wrote some data, 606 * it is not canceled. 607 */ 608 static ssize_t 609 __thr_write(int fd, const void *buf, size_t nbytes) 610 { 611 struct pthread *curthread; 612 ssize_t ret; 613 614 curthread = _get_curthread(); 615 _thr_cancel_enter(curthread); 616 ret = __sys_write(fd, buf, nbytes); 617 _thr_cancel_leave(curthread, (ret <= 0)); 618 return (ret); 619 } 620 621 /* 622 * Cancellation behavior: 623 * Thread may be canceled at start, but if the thread wrote some data, 624 * it is not canceled. 625 */ 626 static ssize_t 627 __thr_writev(int fd, const struct iovec *iov, int iovcnt) 628 { 629 struct pthread *curthread; 630 ssize_t ret; 631 632 curthread = _get_curthread(); 633 _thr_cancel_enter(curthread); 634 ret = __sys_writev(fd, iov, iovcnt); 635 _thr_cancel_leave(curthread, (ret <= 0)); 636 return (ret); 637 } 638 639 void 640 __thr_interpose_libc(void) 641 { 642 643 __set_error_selector(__error_threaded); 644 #define SLOT(name) \ 645 *(__libc_interposing_slot(INTERPOS_##name)) = \ 646 (interpos_func_t)__thr_##name; 647 SLOT(accept); 648 SLOT(accept4); 649 SLOT(aio_suspend); 650 SLOT(close); 651 SLOT(connect); 652 SLOT(fcntl); 653 SLOT(fsync); 654 SLOT(fork); 655 SLOT(msync); 656 SLOT(nanosleep); 657 SLOT(openat); 658 SLOT(poll); 659 SLOT(pselect); 660 SLOT(read); 661 SLOT(readv); 662 SLOT(recvfrom); 663 SLOT(recvmsg); 664 SLOT(select); 665 SLOT(sendmsg); 666 SLOT(sendto); 667 SLOT(setcontext); 668 SLOT(sigaction); 669 SLOT(sigprocmask); 670 SLOT(sigsuspend); 671 SLOT(sigwait); 672 SLOT(sigtimedwait); 673 SLOT(sigwaitinfo); 674 SLOT(swapcontext); 675 SLOT(system); 676 SLOT(tcdrain); 677 SLOT(wait4); 678 SLOT(write); 679 SLOT(writev); 680 SLOT(spinlock); 681 SLOT(spinunlock); 682 SLOT(kevent); 683 SLOT(wait6); 684 SLOT(ppoll); 685 SLOT(map_stacks_exec); 686 SLOT(fdatasync); 687 SLOT(clock_nanosleep); 688 SLOT(pdfork); 689 #undef SLOT 690 *(__libc_interposing_slot( 691 INTERPOS__pthread_mutex_init_calloc_cb)) = 692 (interpos_func_t)_pthread_mutex_init_calloc_cb; 693 } 694