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 __FBSDID("$FreeBSD$"); 70 71 #include "namespace.h" 72 #include <sys/types.h> 73 #include <sys/mman.h> 74 #include <sys/param.h> 75 #include <sys/select.h> 76 #include <sys/signalvar.h> 77 #include <sys/socket.h> 78 #include <sys/stat.h> 79 #include <sys/time.h> 80 #include <sys/uio.h> 81 #include <sys/wait.h> 82 #include <aio.h> 83 #include <dirent.h> 84 #include <errno.h> 85 #include <fcntl.h> 86 #include <poll.h> 87 #include <signal.h> 88 #include <stdarg.h> 89 #include <stdio.h> 90 #include <stdlib.h> 91 #include <string.h> 92 #include <termios.h> 93 #include <unistd.h> 94 #include <pthread.h> 95 #include "un-namespace.h" 96 97 #include "libc_private.h" 98 #include "thr_private.h" 99 100 static int 101 __thr_accept(int s, struct sockaddr *addr, socklen_t *addrlen) 102 { 103 struct pthread *curthread; 104 int ret; 105 106 curthread = _get_curthread(); 107 _thr_cancel_enter(curthread); 108 ret = __sys_accept(s, addr, addrlen); 109 _thr_cancel_leave(curthread, ret == -1); 110 111 return (ret); 112 } 113 114 /* 115 * Cancellation behavior: 116 * If thread is canceled, no socket is created. 117 */ 118 static int 119 __thr_accept4(int s, struct sockaddr *addr, socklen_t *addrlen, int flags) 120 { 121 struct pthread *curthread; 122 int ret; 123 124 curthread = _get_curthread(); 125 _thr_cancel_enter(curthread); 126 ret = __sys_accept4(s, addr, addrlen, flags); 127 _thr_cancel_leave(curthread, ret == -1); 128 129 return (ret); 130 } 131 132 static int 133 __thr_aio_suspend(const struct aiocb * const iocbs[], int niocb, const struct 134 timespec *timeout) 135 { 136 struct pthread *curthread; 137 int ret; 138 139 curthread = _get_curthread(); 140 _thr_cancel_enter(curthread); 141 ret = __sys_aio_suspend(iocbs, niocb, timeout); 142 _thr_cancel_leave(curthread, 1); 143 144 return (ret); 145 } 146 147 /* 148 * Cancellation behavior: 149 * According to manual of close(), the file descriptor is always deleted. 150 * Here, thread is only canceled after the system call, so the file 151 * descriptor is always deleted despite whether the thread is canceled 152 * or not. 153 */ 154 static int 155 __thr_close(int fd) 156 { 157 struct pthread *curthread; 158 int ret; 159 160 curthread = _get_curthread(); 161 _thr_cancel_enter2(curthread, 0); 162 ret = __sys_close(fd); 163 _thr_cancel_leave(curthread, 1); 164 165 return (ret); 166 } 167 168 /* 169 * Cancellation behavior: 170 * If the thread is canceled, connection is not made. 171 */ 172 static int 173 __thr_connect(int fd, const struct sockaddr *name, socklen_t namelen) 174 { 175 struct pthread *curthread; 176 int ret; 177 178 curthread = _get_curthread(); 179 _thr_cancel_enter(curthread); 180 ret = __sys_connect(fd, name, namelen); 181 _thr_cancel_leave(curthread, ret == -1); 182 183 return (ret); 184 } 185 186 /* 187 * Cancellation behavior: 188 * According to specification, only F_SETLKW is a cancellation point. 189 * Thread is only canceled at start, or canceled if the system call 190 * is failure, this means the function does not generate side effect 191 * if it is canceled. 192 */ 193 static int 194 __thr_fcntl(int fd, int cmd, ...) 195 { 196 struct pthread *curthread; 197 int ret; 198 va_list ap; 199 200 curthread = _get_curthread(); 201 va_start(ap, cmd); 202 if (cmd == F_OSETLKW || cmd == F_SETLKW) { 203 _thr_cancel_enter(curthread); 204 ret = __sys_fcntl(fd, cmd, va_arg(ap, void *)); 205 _thr_cancel_leave(curthread, ret == -1); 206 } else { 207 ret = __sys_fcntl(fd, cmd, va_arg(ap, void *)); 208 } 209 va_end(ap); 210 211 return (ret); 212 } 213 214 /* 215 * Cancellation behavior: 216 * Thread may be canceled after system call. 217 */ 218 static int 219 __thr_fsync(int fd) 220 { 221 struct pthread *curthread; 222 int ret; 223 224 curthread = _get_curthread(); 225 _thr_cancel_enter2(curthread, 0); 226 ret = __sys_fsync(fd); 227 _thr_cancel_leave(curthread, 1); 228 229 return (ret); 230 } 231 232 static int 233 __thr_fdatasync(int fd) 234 { 235 struct pthread *curthread; 236 int ret; 237 238 curthread = _get_curthread(); 239 _thr_cancel_enter2(curthread, 0); 240 ret = __sys_fdatasync(fd); 241 _thr_cancel_leave(curthread, 1); 242 243 return (ret); 244 } 245 246 /* 247 * Cancellation behavior: 248 * Thread may be canceled after system call. 249 */ 250 static int 251 __thr_msync(void *addr, size_t len, int flags) 252 { 253 struct pthread *curthread; 254 int ret; 255 256 curthread = _get_curthread(); 257 _thr_cancel_enter2(curthread, 0); 258 ret = __sys_msync(addr, len, flags); 259 _thr_cancel_leave(curthread, 1); 260 261 return (ret); 262 } 263 264 static int 265 __thr_clock_nanosleep(clockid_t clock_id, int flags, 266 const struct timespec *time_to_sleep, struct timespec *time_remaining) 267 { 268 struct pthread *curthread; 269 int ret; 270 271 curthread = _get_curthread(); 272 _thr_cancel_enter(curthread); 273 ret = __sys_clock_nanosleep(clock_id, flags, time_to_sleep, 274 time_remaining); 275 _thr_cancel_leave(curthread, 1); 276 277 return (ret); 278 } 279 280 static int 281 __thr_nanosleep(const struct timespec *time_to_sleep, 282 struct timespec *time_remaining) 283 { 284 struct pthread *curthread; 285 int ret; 286 287 curthread = _get_curthread(); 288 _thr_cancel_enter(curthread); 289 ret = __sys_nanosleep(time_to_sleep, time_remaining); 290 _thr_cancel_leave(curthread, 1); 291 292 return (ret); 293 } 294 295 /* 296 * Cancellation behavior: 297 * If the thread is canceled, file is not opened. 298 */ 299 static int 300 __thr_openat(int fd, const char *path, int flags, ...) 301 { 302 struct pthread *curthread; 303 int mode, ret; 304 va_list ap; 305 306 307 /* Check if the file is being created: */ 308 if ((flags & O_CREAT) != 0) { 309 /* Get the creation mode: */ 310 va_start(ap, flags); 311 mode = va_arg(ap, int); 312 va_end(ap); 313 } else { 314 mode = 0; 315 } 316 317 curthread = _get_curthread(); 318 _thr_cancel_enter(curthread); 319 ret = __sys_openat(fd, path, flags, mode); 320 _thr_cancel_leave(curthread, ret == -1); 321 322 return (ret); 323 } 324 325 /* 326 * Cancellation behavior: 327 * Thread may be canceled at start, but if the system call returns something, 328 * the thread is not canceled. 329 */ 330 static int 331 __thr_poll(struct pollfd *fds, unsigned int nfds, int timeout) 332 { 333 struct pthread *curthread; 334 int ret; 335 336 curthread = _get_curthread(); 337 _thr_cancel_enter(curthread); 338 ret = __sys_poll(fds, nfds, timeout); 339 _thr_cancel_leave(curthread, ret == -1); 340 341 return (ret); 342 } 343 344 /* 345 * Cancellation behavior: 346 * Thread may be canceled at start, but if the system call returns something, 347 * the thread is not canceled. 348 */ 349 static int 350 __thr_ppoll(struct pollfd pfd[], nfds_t nfds, const struct timespec * 351 timeout, const sigset_t *newsigmask) 352 { 353 struct pthread *curthread; 354 int ret; 355 356 curthread = _get_curthread(); 357 _thr_cancel_enter(curthread); 358 ret = __sys_ppoll(pfd, nfds, timeout, newsigmask); 359 _thr_cancel_leave(curthread, ret == -1); 360 361 return (ret); 362 } 363 364 /* 365 * Cancellation behavior: 366 * Thread may be canceled at start, but if the system call returns something, 367 * the thread is not canceled. 368 */ 369 static int 370 __thr_pselect(int count, fd_set *rfds, fd_set *wfds, fd_set *efds, 371 const struct timespec *timo, const sigset_t *mask) 372 { 373 struct pthread *curthread; 374 int ret; 375 376 curthread = _get_curthread(); 377 _thr_cancel_enter(curthread); 378 ret = __sys_pselect(count, rfds, wfds, efds, timo, mask); 379 _thr_cancel_leave(curthread, ret == -1); 380 381 return (ret); 382 } 383 384 static int 385 __thr_kevent(int kq, const struct kevent *changelist, int nchanges, 386 struct kevent *eventlist, int nevents, const struct timespec *timeout) 387 { 388 struct pthread *curthread; 389 int ret; 390 391 if (nevents == 0) { 392 /* 393 * No blocking, do not make the call cancellable. 394 */ 395 return (__sys_kevent(kq, changelist, nchanges, eventlist, 396 nevents, timeout)); 397 } 398 curthread = _get_curthread(); 399 _thr_cancel_enter(curthread); 400 ret = __sys_kevent(kq, changelist, nchanges, eventlist, nevents, 401 timeout); 402 _thr_cancel_leave(curthread, ret == -1 && nchanges == 0); 403 404 return (ret); 405 } 406 407 /* 408 * Cancellation behavior: 409 * Thread may be canceled at start, but if the system call got some data, 410 * the thread is not canceled. 411 */ 412 static ssize_t 413 __thr_read(int fd, void *buf, size_t nbytes) 414 { 415 struct pthread *curthread; 416 ssize_t ret; 417 418 curthread = _get_curthread(); 419 _thr_cancel_enter(curthread); 420 ret = __sys_read(fd, buf, nbytes); 421 _thr_cancel_leave(curthread, ret == -1); 422 423 return (ret); 424 } 425 426 /* 427 * Cancellation behavior: 428 * Thread may be canceled at start, but if the system call got some data, 429 * the thread is not canceled. 430 */ 431 static ssize_t 432 __thr_readv(int fd, const struct iovec *iov, int iovcnt) 433 { 434 struct pthread *curthread; 435 ssize_t ret; 436 437 curthread = _get_curthread(); 438 _thr_cancel_enter(curthread); 439 ret = __sys_readv(fd, iov, iovcnt); 440 _thr_cancel_leave(curthread, ret == -1); 441 return (ret); 442 } 443 444 /* 445 * Cancellation behavior: 446 * Thread may be canceled at start, but if the system call got some data, 447 * the thread is not canceled. 448 */ 449 static ssize_t 450 __thr_recvfrom(int s, void *b, size_t l, int f, struct sockaddr *from, 451 socklen_t *fl) 452 { 453 struct pthread *curthread; 454 ssize_t ret; 455 456 curthread = _get_curthread(); 457 _thr_cancel_enter(curthread); 458 ret = __sys_recvfrom(s, b, l, f, from, fl); 459 _thr_cancel_leave(curthread, ret == -1); 460 return (ret); 461 } 462 463 /* 464 * Cancellation behavior: 465 * Thread may be canceled at start, but if the system call got some data, 466 * the thread is not canceled. 467 */ 468 static ssize_t 469 __thr_recvmsg(int s, struct msghdr *m, int f) 470 { 471 struct pthread *curthread; 472 ssize_t ret; 473 474 curthread = _get_curthread(); 475 _thr_cancel_enter(curthread); 476 ret = __sys_recvmsg(s, m, f); 477 _thr_cancel_leave(curthread, ret == -1); 478 return (ret); 479 } 480 481 /* 482 * Cancellation behavior: 483 * Thread may be canceled at start, but if the system call returns something, 484 * the thread is not canceled. 485 */ 486 static int 487 __thr_select(int numfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, 488 struct timeval *timeout) 489 { 490 struct pthread *curthread; 491 int ret; 492 493 curthread = _get_curthread(); 494 _thr_cancel_enter(curthread); 495 ret = __sys_select(numfds, readfds, writefds, exceptfds, timeout); 496 _thr_cancel_leave(curthread, ret == -1); 497 return (ret); 498 } 499 500 /* 501 * Cancellation behavior: 502 * Thread may be canceled at start, but if the system call sent 503 * data, the thread is not canceled. 504 */ 505 static ssize_t 506 __thr_sendmsg(int s, const struct msghdr *m, int f) 507 { 508 struct pthread *curthread; 509 ssize_t ret; 510 511 curthread = _get_curthread(); 512 _thr_cancel_enter(curthread); 513 ret = __sys_sendmsg(s, m, f); 514 _thr_cancel_leave(curthread, ret <= 0); 515 return (ret); 516 } 517 518 /* 519 * Cancellation behavior: 520 * Thread may be canceled at start, but if the system call sent some 521 * data, the thread is not canceled. 522 */ 523 static ssize_t 524 __thr_sendto(int s, const void *m, size_t l, int f, const struct sockaddr *t, 525 socklen_t tl) 526 { 527 struct pthread *curthread; 528 ssize_t ret; 529 530 curthread = _get_curthread(); 531 _thr_cancel_enter(curthread); 532 ret = __sys_sendto(s, m, l, f, t, tl); 533 _thr_cancel_leave(curthread, ret <= 0); 534 return (ret); 535 } 536 537 static int 538 __thr_system(const char *string) 539 { 540 struct pthread *curthread; 541 int ret; 542 543 curthread = _get_curthread(); 544 _thr_cancel_enter(curthread); 545 ret = __libc_system(string); 546 _thr_cancel_leave(curthread, 1); 547 return (ret); 548 } 549 550 /* 551 * Cancellation behavior: 552 * If thread is canceled, the system call is not completed, 553 * this means not all bytes were drained. 554 */ 555 static int 556 __thr_tcdrain(int fd) 557 { 558 struct pthread *curthread; 559 int ret; 560 561 curthread = _get_curthread(); 562 _thr_cancel_enter(curthread); 563 ret = __libc_tcdrain(fd); 564 _thr_cancel_leave(curthread, ret == -1); 565 return (ret); 566 } 567 568 /* 569 * Cancellation behavior: 570 * Thread may be canceled at start, but if the system call returns 571 * a child pid, the thread is not canceled. 572 */ 573 static pid_t 574 __thr_wait4(pid_t pid, int *status, int options, struct rusage *rusage) 575 { 576 struct pthread *curthread; 577 pid_t ret; 578 579 curthread = _get_curthread(); 580 _thr_cancel_enter(curthread); 581 ret = __sys_wait4(pid, status, options, rusage); 582 _thr_cancel_leave(curthread, ret <= 0); 583 return (ret); 584 } 585 586 /* 587 * Cancellation behavior: 588 * Thread may be canceled at start, but if the system call returns 589 * a child pid, the thread is not canceled. 590 */ 591 static pid_t 592 __thr_wait6(idtype_t idtype, id_t id, int *status, int options, 593 struct __wrusage *ru, siginfo_t *infop) 594 { 595 struct pthread *curthread; 596 pid_t ret; 597 598 curthread = _get_curthread(); 599 _thr_cancel_enter(curthread); 600 ret = __sys_wait6(idtype, id, status, options, ru, infop); 601 _thr_cancel_leave(curthread, ret <= 0); 602 return (ret); 603 } 604 605 /* 606 * Cancellation behavior: 607 * Thread may be canceled at start, but if the thread wrote some data, 608 * it is not canceled. 609 */ 610 static ssize_t 611 __thr_write(int fd, const void *buf, size_t nbytes) 612 { 613 struct pthread *curthread; 614 ssize_t ret; 615 616 curthread = _get_curthread(); 617 _thr_cancel_enter(curthread); 618 ret = __sys_write(fd, buf, nbytes); 619 _thr_cancel_leave(curthread, (ret <= 0)); 620 return (ret); 621 } 622 623 /* 624 * Cancellation behavior: 625 * Thread may be canceled at start, but if the thread wrote some data, 626 * it is not canceled. 627 */ 628 static ssize_t 629 __thr_writev(int fd, const struct iovec *iov, int iovcnt) 630 { 631 struct pthread *curthread; 632 ssize_t ret; 633 634 curthread = _get_curthread(); 635 _thr_cancel_enter(curthread); 636 ret = __sys_writev(fd, iov, iovcnt); 637 _thr_cancel_leave(curthread, (ret <= 0)); 638 return (ret); 639 } 640 641 void 642 __thr_interpose_libc(void) 643 { 644 645 __set_error_selector(__error_threaded); 646 #define SLOT(name) \ 647 *(__libc_interposing_slot(INTERPOS_##name)) = \ 648 (interpos_func_t)__thr_##name; 649 SLOT(accept); 650 SLOT(accept4); 651 SLOT(aio_suspend); 652 SLOT(close); 653 SLOT(connect); 654 SLOT(fcntl); 655 SLOT(fsync); 656 SLOT(fork); 657 SLOT(msync); 658 SLOT(nanosleep); 659 SLOT(openat); 660 SLOT(poll); 661 SLOT(pselect); 662 SLOT(read); 663 SLOT(readv); 664 SLOT(recvfrom); 665 SLOT(recvmsg); 666 SLOT(select); 667 SLOT(sendmsg); 668 SLOT(sendto); 669 SLOT(setcontext); 670 SLOT(sigaction); 671 SLOT(sigprocmask); 672 SLOT(sigsuspend); 673 SLOT(sigwait); 674 SLOT(sigtimedwait); 675 SLOT(sigwaitinfo); 676 SLOT(swapcontext); 677 SLOT(system); 678 SLOT(tcdrain); 679 SLOT(wait4); 680 SLOT(write); 681 SLOT(writev); 682 SLOT(spinlock); 683 SLOT(spinunlock); 684 SLOT(kevent); 685 SLOT(wait6); 686 SLOT(ppoll); 687 SLOT(map_stacks_exec); 688 SLOT(fdatasync); 689 SLOT(clock_nanosleep); 690 SLOT(pdfork); 691 #undef SLOT 692 *(__libc_interposing_slot( 693 INTERPOS__pthread_mutex_init_calloc_cb)) = 694 (interpos_func_t)_pthread_mutex_init_calloc_cb; 695 } 696