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 "namespace.h" 69 #include <sys/types.h> 70 #include <sys/mman.h> 71 #include <sys/param.h> 72 #include <sys/select.h> 73 #include <sys/signalvar.h> 74 #include <sys/socket.h> 75 #include <sys/stat.h> 76 #include <sys/time.h> 77 #include <sys/uio.h> 78 #include <sys/wait.h> 79 #include <aio.h> 80 #include <dirent.h> 81 #include <errno.h> 82 #include <fcntl.h> 83 #include <poll.h> 84 #include <signal.h> 85 #include <stdarg.h> 86 #include <stdio.h> 87 #include <stdlib.h> 88 #include <string.h> 89 #include <termios.h> 90 #include <unistd.h> 91 #include <pthread.h> 92 #include "un-namespace.h" 93 94 #include "libc_private.h" 95 #include "thr_private.h" 96 97 static int 98 __thr_accept(int s, struct sockaddr *addr, socklen_t *addrlen) 99 { 100 struct pthread *curthread; 101 int ret; 102 103 curthread = _get_curthread(); 104 _thr_cancel_enter(curthread); 105 ret = __sys_accept(s, addr, addrlen); 106 _thr_cancel_leave(curthread, ret == -1); 107 108 return (ret); 109 } 110 111 /* 112 * Cancellation behavior: 113 * If thread is canceled, no socket is created. 114 */ 115 static int 116 __thr_accept4(int s, struct sockaddr *addr, socklen_t *addrlen, int flags) 117 { 118 struct pthread *curthread; 119 int ret; 120 121 curthread = _get_curthread(); 122 _thr_cancel_enter(curthread); 123 ret = __sys_accept4(s, addr, addrlen, flags); 124 _thr_cancel_leave(curthread, ret == -1); 125 126 return (ret); 127 } 128 129 static int 130 __thr_aio_suspend(const struct aiocb * const iocbs[], int niocb, const struct 131 timespec *timeout) 132 { 133 struct pthread *curthread; 134 int ret; 135 136 curthread = _get_curthread(); 137 _thr_cancel_enter(curthread); 138 ret = __sys_aio_suspend(iocbs, niocb, timeout); 139 _thr_cancel_leave(curthread, 1); 140 141 return (ret); 142 } 143 144 /* 145 * Cancellation behavior: 146 * According to manual of close(), the file descriptor is always deleted. 147 * Here, thread is only canceled after the system call, so the file 148 * descriptor is always deleted despite whether the thread is canceled 149 * or not. 150 */ 151 static int 152 __thr_close(int fd) 153 { 154 struct pthread *curthread; 155 int ret; 156 157 curthread = _get_curthread(); 158 _thr_cancel_enter2(curthread, 0); 159 ret = __sys_close(fd); 160 _thr_cancel_leave(curthread, 1); 161 162 return (ret); 163 } 164 165 /* 166 * Cancellation behavior: 167 * If the thread is canceled, connection is not made. 168 */ 169 static int 170 __thr_connect(int fd, const struct sockaddr *name, socklen_t namelen) 171 { 172 struct pthread *curthread; 173 int ret; 174 175 curthread = _get_curthread(); 176 _thr_cancel_enter(curthread); 177 ret = __sys_connect(fd, name, namelen); 178 _thr_cancel_leave(curthread, ret == -1); 179 180 return (ret); 181 } 182 183 /* 184 * Cancellation behavior: 185 * According to specification, only F_SETLKW is a cancellation point. 186 * Thread is only canceled at start, or canceled if the system call 187 * is failure, this means the function does not generate side effect 188 * if it is canceled. 189 */ 190 static int 191 __thr_fcntl(int fd, int cmd, ...) 192 { 193 struct pthread *curthread; 194 int ret; 195 va_list ap; 196 197 curthread = _get_curthread(); 198 va_start(ap, cmd); 199 if (cmd == F_OSETLKW || cmd == F_SETLKW) { 200 _thr_cancel_enter(curthread); 201 ret = __sys_fcntl(fd, cmd, (intptr_t)va_arg(ap, void *)); 202 _thr_cancel_leave(curthread, ret == -1); 203 } else { 204 ret = __sys_fcntl(fd, cmd, (intptr_t)va_arg(ap, void *)); 205 } 206 va_end(ap); 207 208 return (ret); 209 } 210 211 /* 212 * Cancellation behavior: 213 * Thread may be canceled after system call. 214 */ 215 static int 216 __thr_fsync(int fd) 217 { 218 struct pthread *curthread; 219 int ret; 220 221 curthread = _get_curthread(); 222 _thr_cancel_enter2(curthread, 0); 223 ret = __sys_fsync(fd); 224 _thr_cancel_leave(curthread, 1); 225 226 return (ret); 227 } 228 229 static int 230 __thr_fdatasync(int fd) 231 { 232 struct pthread *curthread; 233 int ret; 234 235 curthread = _get_curthread(); 236 _thr_cancel_enter2(curthread, 0); 237 ret = __sys_fdatasync(fd); 238 _thr_cancel_leave(curthread, 1); 239 240 return (ret); 241 } 242 243 /* 244 * Cancellation behavior: 245 * Thread may be canceled after system call. 246 */ 247 static int 248 __thr_msync(void *addr, size_t len, int flags) 249 { 250 struct pthread *curthread; 251 int ret; 252 253 curthread = _get_curthread(); 254 _thr_cancel_enter2(curthread, 0); 255 ret = __sys_msync(addr, len, flags); 256 _thr_cancel_leave(curthread, 1); 257 258 return (ret); 259 } 260 261 static int 262 __thr_clock_nanosleep(clockid_t clock_id, int flags, 263 const struct timespec *time_to_sleep, struct timespec *time_remaining) 264 { 265 struct pthread *curthread; 266 int ret; 267 268 curthread = _get_curthread(); 269 _thr_cancel_enter(curthread); 270 ret = __sys_clock_nanosleep(clock_id, flags, time_to_sleep, 271 time_remaining); 272 _thr_cancel_leave(curthread, 1); 273 274 return (ret); 275 } 276 277 static int 278 __thr_nanosleep(const struct timespec *time_to_sleep, 279 struct timespec *time_remaining) 280 { 281 struct pthread *curthread; 282 int ret; 283 284 curthread = _get_curthread(); 285 _thr_cancel_enter(curthread); 286 ret = __sys_nanosleep(time_to_sleep, time_remaining); 287 _thr_cancel_leave(curthread, 1); 288 289 return (ret); 290 } 291 292 /* 293 * Cancellation behavior: 294 * If the thread is canceled, file is not opened. 295 */ 296 static int 297 __thr_openat(int fd, const char *path, int flags, ...) 298 { 299 struct pthread *curthread; 300 int mode, ret; 301 va_list ap; 302 303 304 /* Check if the file is being created: */ 305 if ((flags & O_CREAT) != 0) { 306 /* Get the creation mode: */ 307 va_start(ap, flags); 308 mode = va_arg(ap, int); 309 va_end(ap); 310 } else { 311 mode = 0; 312 } 313 314 curthread = _get_curthread(); 315 _thr_cancel_enter(curthread); 316 ret = __sys_openat(fd, path, flags, mode); 317 _thr_cancel_leave(curthread, ret == -1); 318 319 return (ret); 320 } 321 322 /* 323 * Cancellation behavior: 324 * Thread may be canceled at start, but if the system call returns something, 325 * the thread is not canceled. 326 */ 327 static int 328 __thr_poll(struct pollfd *fds, unsigned int nfds, int timeout) 329 { 330 struct pthread *curthread; 331 int ret; 332 333 curthread = _get_curthread(); 334 _thr_cancel_enter(curthread); 335 ret = __sys_poll(fds, nfds, timeout); 336 _thr_cancel_leave(curthread, ret == -1); 337 338 return (ret); 339 } 340 341 /* 342 * Cancellation behavior: 343 * Thread may be canceled at start, but if the system call returns something, 344 * the thread is not canceled. 345 */ 346 static int 347 __thr_ppoll(struct pollfd pfd[], nfds_t nfds, const struct timespec * 348 timeout, const sigset_t *newsigmask) 349 { 350 struct pthread *curthread; 351 int ret; 352 353 curthread = _get_curthread(); 354 _thr_cancel_enter(curthread); 355 ret = __sys_ppoll(pfd, nfds, timeout, newsigmask); 356 _thr_cancel_leave(curthread, ret == -1); 357 358 return (ret); 359 } 360 361 /* 362 * Cancellation behavior: 363 * Thread may be canceled at start, but if the system call returns something, 364 * the thread is not canceled. 365 */ 366 static int 367 __thr_pselect(int count, fd_set *rfds, fd_set *wfds, fd_set *efds, 368 const struct timespec *timo, const sigset_t *mask) 369 { 370 struct pthread *curthread; 371 int ret; 372 373 curthread = _get_curthread(); 374 _thr_cancel_enter(curthread); 375 ret = __sys_pselect(count, rfds, wfds, efds, timo, mask); 376 _thr_cancel_leave(curthread, ret == -1); 377 378 return (ret); 379 } 380 381 static int 382 __thr_kevent(int kq, const struct kevent *changelist, int nchanges, 383 struct kevent *eventlist, int nevents, const struct timespec *timeout) 384 { 385 struct pthread *curthread; 386 int ret; 387 388 if (nevents == 0) { 389 /* 390 * No blocking, do not make the call cancellable. 391 */ 392 return (__sys_kevent(kq, changelist, nchanges, eventlist, 393 nevents, timeout)); 394 } 395 curthread = _get_curthread(); 396 _thr_cancel_enter(curthread); 397 ret = __sys_kevent(kq, changelist, nchanges, eventlist, nevents, 398 timeout); 399 _thr_cancel_leave(curthread, ret == -1 && nchanges == 0); 400 401 return (ret); 402 } 403 404 /* 405 * Cancellation behavior: 406 * Thread may be canceled at start, but if the system call got some data, 407 * the thread is not canceled. 408 */ 409 static ssize_t 410 __thr_read(int fd, void *buf, size_t nbytes) 411 { 412 struct pthread *curthread; 413 ssize_t ret; 414 415 curthread = _get_curthread(); 416 _thr_cancel_enter(curthread); 417 ret = __sys_read(fd, buf, nbytes); 418 _thr_cancel_leave(curthread, ret == -1); 419 420 return (ret); 421 } 422 423 /* 424 * Cancellation behavior: 425 * Thread may be canceled at start, but if the system call got some data, 426 * the thread is not canceled. 427 */ 428 static ssize_t 429 __thr_readv(int fd, const struct iovec *iov, int iovcnt) 430 { 431 struct pthread *curthread; 432 ssize_t ret; 433 434 curthread = _get_curthread(); 435 _thr_cancel_enter(curthread); 436 ret = __sys_readv(fd, iov, iovcnt); 437 _thr_cancel_leave(curthread, ret == -1); 438 return (ret); 439 } 440 441 /* 442 * Cancellation behavior: 443 * Thread may be canceled at start, but if the system call got some data, 444 * the thread is not canceled. 445 */ 446 static ssize_t 447 __thr_recvfrom(int s, void *b, size_t l, int f, struct sockaddr *from, 448 socklen_t *fl) 449 { 450 struct pthread *curthread; 451 ssize_t ret; 452 453 curthread = _get_curthread(); 454 _thr_cancel_enter(curthread); 455 ret = __sys_recvfrom(s, b, l, f, from, fl); 456 _thr_cancel_leave(curthread, ret == -1); 457 return (ret); 458 } 459 460 /* 461 * Cancellation behavior: 462 * Thread may be canceled at start, but if the system call got some data, 463 * the thread is not canceled. 464 */ 465 static ssize_t 466 __thr_recvmsg(int s, struct msghdr *m, int f) 467 { 468 struct pthread *curthread; 469 ssize_t ret; 470 471 curthread = _get_curthread(); 472 _thr_cancel_enter(curthread); 473 ret = __sys_recvmsg(s, m, f); 474 _thr_cancel_leave(curthread, ret == -1); 475 return (ret); 476 } 477 478 /* 479 * Cancellation behavior: 480 * Thread may be canceled at start, but if the system call returns something, 481 * the thread is not canceled. 482 */ 483 static int 484 __thr_select(int numfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, 485 struct timeval *timeout) 486 { 487 struct pthread *curthread; 488 int ret; 489 490 curthread = _get_curthread(); 491 _thr_cancel_enter(curthread); 492 ret = __sys_select(numfds, readfds, writefds, exceptfds, timeout); 493 _thr_cancel_leave(curthread, ret == -1); 494 return (ret); 495 } 496 497 /* 498 * Cancellation behavior: 499 * Thread may be canceled at start, but if the system call sent 500 * data, the thread is not canceled. 501 */ 502 static ssize_t 503 __thr_sendmsg(int s, const struct msghdr *m, int f) 504 { 505 struct pthread *curthread; 506 ssize_t ret; 507 508 curthread = _get_curthread(); 509 _thr_cancel_enter(curthread); 510 ret = __sys_sendmsg(s, m, f); 511 _thr_cancel_leave(curthread, ret <= 0); 512 return (ret); 513 } 514 515 /* 516 * Cancellation behavior: 517 * Thread may be canceled at start, but if the system call sent some 518 * data, the thread is not canceled. 519 */ 520 static ssize_t 521 __thr_sendto(int s, const void *m, size_t l, int f, const struct sockaddr *t, 522 socklen_t tl) 523 { 524 struct pthread *curthread; 525 ssize_t ret; 526 527 curthread = _get_curthread(); 528 _thr_cancel_enter(curthread); 529 ret = __sys_sendto(s, m, l, f, t, tl); 530 _thr_cancel_leave(curthread, ret <= 0); 531 return (ret); 532 } 533 534 static int 535 __thr_system(const char *string) 536 { 537 struct pthread *curthread; 538 int ret; 539 540 curthread = _get_curthread(); 541 _thr_cancel_enter(curthread); 542 ret = __libc_system(string); 543 _thr_cancel_leave(curthread, 1); 544 return (ret); 545 } 546 547 /* 548 * Cancellation behavior: 549 * If thread is canceled, the system call is not completed, 550 * this means not all bytes were drained. 551 */ 552 static int 553 __thr_tcdrain(int fd) 554 { 555 struct pthread *curthread; 556 int ret; 557 558 curthread = _get_curthread(); 559 _thr_cancel_enter(curthread); 560 ret = __libc_tcdrain(fd); 561 _thr_cancel_leave(curthread, ret == -1); 562 return (ret); 563 } 564 565 /* 566 * Cancellation behavior: 567 * Thread may be canceled at start, but if the system call returns 568 * a child pid, the thread is not canceled. 569 */ 570 static pid_t 571 __thr_wait4(pid_t pid, int *status, int options, struct rusage *rusage) 572 { 573 struct pthread *curthread; 574 pid_t ret; 575 576 curthread = _get_curthread(); 577 _thr_cancel_enter(curthread); 578 ret = __sys_wait4(pid, status, options, rusage); 579 _thr_cancel_leave(curthread, ret <= 0); 580 return (ret); 581 } 582 583 /* 584 * Cancellation behavior: 585 * Thread may be canceled at start, but if the system call returns 586 * a child pid, the thread is not canceled. 587 */ 588 static pid_t 589 __thr_wait6(idtype_t idtype, id_t id, int *status, int options, 590 struct __wrusage *ru, siginfo_t *infop) 591 { 592 struct pthread *curthread; 593 pid_t ret; 594 595 curthread = _get_curthread(); 596 _thr_cancel_enter(curthread); 597 ret = __sys_wait6(idtype, id, status, options, ru, infop); 598 _thr_cancel_leave(curthread, ret <= 0); 599 return (ret); 600 } 601 602 /* 603 * Cancellation behavior: 604 * Thread may be canceled at start, but if the thread wrote some data, 605 * it is not canceled. 606 */ 607 static ssize_t 608 __thr_write(int fd, const void *buf, size_t nbytes) 609 { 610 struct pthread *curthread; 611 ssize_t ret; 612 613 curthread = _get_curthread(); 614 _thr_cancel_enter(curthread); 615 ret = __sys_write(fd, buf, nbytes); 616 _thr_cancel_leave(curthread, (ret <= 0)); 617 return (ret); 618 } 619 620 /* 621 * Cancellation behavior: 622 * Thread may be canceled at start, but if the thread wrote some data, 623 * it is not canceled. 624 */ 625 static ssize_t 626 __thr_writev(int fd, const struct iovec *iov, int iovcnt) 627 { 628 struct pthread *curthread; 629 ssize_t ret; 630 631 curthread = _get_curthread(); 632 _thr_cancel_enter(curthread); 633 ret = __sys_writev(fd, iov, iovcnt); 634 _thr_cancel_leave(curthread, (ret <= 0)); 635 return (ret); 636 } 637 638 void 639 __thr_interpose_libc(void) 640 { 641 642 __set_error_selector(__error_threaded); 643 #define SLOT(name) \ 644 *(__libc_interposing_slot(INTERPOS_##name)) = \ 645 (interpos_func_t)__thr_##name; 646 SLOT(system); 647 SLOT(tcdrain); 648 SLOT(spinlock); 649 SLOT(spinunlock); 650 SLOT(map_stacks_exec); 651 #undef SLOT 652 653 #define SLOT(name) \ 654 *(__libc_interposing_slot(INTERPOS_##name)) = \ 655 (interpos_func_t)__thr_##name; 656 SLOT(accept); 657 SLOT(accept4); 658 SLOT(aio_suspend); 659 SLOT(close); 660 SLOT(connect); 661 SLOT(fcntl); 662 SLOT(fsync); 663 SLOT(fork); 664 SLOT(msync); 665 SLOT(nanosleep); 666 SLOT(openat); 667 SLOT(poll); 668 SLOT(pselect); 669 SLOT(read); 670 SLOT(readv); 671 SLOT(recvfrom); 672 SLOT(recvmsg); 673 SLOT(select); 674 SLOT(sendmsg); 675 SLOT(sendto); 676 SLOT(setcontext); 677 SLOT(sigaction); 678 SLOT(sigprocmask); 679 SLOT(sigsuspend); 680 SLOT(sigwait); 681 SLOT(sigtimedwait); 682 SLOT(sigwaitinfo); 683 SLOT(swapcontext); 684 SLOT(wait4); 685 SLOT(write); 686 SLOT(writev); 687 SLOT(kevent); 688 SLOT(wait6); 689 SLOT(ppoll); 690 SLOT(fdatasync); 691 SLOT(clock_nanosleep); 692 SLOT(pdfork); 693 #undef SLOT 694 *(__libc_interposing_slot( 695 INTERPOS__pthread_mutex_init_calloc_cb)) = 696 (interpos_func_t)_pthread_mutex_init_calloc_cb; 697 } 698