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, __intptr_t arg) 192 { 193 struct pthread *curthread; 194 int ret; 195 196 curthread = _get_curthread(); 197 if (cmd == F_OSETLKW || cmd == F_SETLKW) { 198 _thr_cancel_enter(curthread); 199 ret = __sys_fcntl(fd, cmd, arg); 200 _thr_cancel_leave(curthread, ret == -1); 201 } else { 202 ret = __sys_fcntl(fd, cmd, arg); 203 } 204 205 return (ret); 206 } 207 208 /* 209 * Cancellation behavior: 210 * Thread may be canceled after system call. 211 */ 212 static int 213 __thr_fsync(int fd) 214 { 215 struct pthread *curthread; 216 int ret; 217 218 curthread = _get_curthread(); 219 _thr_cancel_enter2(curthread, 0); 220 ret = __sys_fsync(fd); 221 _thr_cancel_leave(curthread, 1); 222 223 return (ret); 224 } 225 226 static int 227 __thr_fdatasync(int fd) 228 { 229 struct pthread *curthread; 230 int ret; 231 232 curthread = _get_curthread(); 233 _thr_cancel_enter2(curthread, 0); 234 ret = __sys_fdatasync(fd); 235 _thr_cancel_leave(curthread, 1); 236 237 return (ret); 238 } 239 240 /* 241 * Cancellation behavior: 242 * Thread may be canceled after system call. 243 */ 244 static int 245 __thr_msync(void *addr, size_t len, int flags) 246 { 247 struct pthread *curthread; 248 int ret; 249 250 curthread = _get_curthread(); 251 _thr_cancel_enter2(curthread, 0); 252 ret = __sys_msync(addr, len, flags); 253 _thr_cancel_leave(curthread, 1); 254 255 return (ret); 256 } 257 258 static int 259 __thr_clock_nanosleep(clockid_t clock_id, int flags, 260 const struct timespec *time_to_sleep, struct timespec *time_remaining) 261 { 262 struct pthread *curthread; 263 int ret; 264 265 curthread = _get_curthread(); 266 _thr_cancel_enter(curthread); 267 ret = __sys_clock_nanosleep(clock_id, flags, time_to_sleep, 268 time_remaining); 269 _thr_cancel_leave(curthread, 1); 270 271 return (ret); 272 } 273 274 static int 275 __thr_nanosleep(const struct timespec *time_to_sleep, 276 struct timespec *time_remaining) 277 { 278 struct pthread *curthread; 279 int ret; 280 281 curthread = _get_curthread(); 282 _thr_cancel_enter(curthread); 283 ret = __sys_nanosleep(time_to_sleep, time_remaining); 284 _thr_cancel_leave(curthread, 1); 285 286 return (ret); 287 } 288 289 /* 290 * Cancellation behavior: 291 * If the thread is canceled, file is not opened. 292 */ 293 static int 294 __thr_openat(int fd, const char *path, int flags, int mode) 295 { 296 struct pthread *curthread; 297 int ret; 298 299 curthread = _get_curthread(); 300 _thr_cancel_enter(curthread); 301 ret = __sys_openat(fd, path, flags, mode); 302 _thr_cancel_leave(curthread, ret == -1); 303 304 return (ret); 305 } 306 307 /* 308 * Cancellation behavior: 309 * Thread may be canceled at start, but if the system call returns something, 310 * the thread is not canceled. 311 */ 312 static int 313 __thr_poll(struct pollfd *fds, unsigned int nfds, int timeout) 314 { 315 struct pthread *curthread; 316 int ret; 317 318 curthread = _get_curthread(); 319 _thr_cancel_enter(curthread); 320 ret = __sys_poll(fds, nfds, timeout); 321 _thr_cancel_leave(curthread, ret == -1); 322 323 return (ret); 324 } 325 326 /* 327 * Cancellation behavior: 328 * Thread may be canceled at start, but if the system call returns something, 329 * the thread is not canceled. 330 */ 331 static int 332 __thr_ppoll(struct pollfd pfd[], nfds_t nfds, const struct timespec * 333 timeout, const sigset_t *newsigmask) 334 { 335 struct pthread *curthread; 336 int ret; 337 338 curthread = _get_curthread(); 339 _thr_cancel_enter(curthread); 340 ret = __sys_ppoll(pfd, nfds, timeout, newsigmask); 341 _thr_cancel_leave(curthread, ret == -1); 342 343 return (ret); 344 } 345 346 /* 347 * Cancellation behavior: 348 * Thread may be canceled at start, but if the system call returns something, 349 * the thread is not canceled. 350 */ 351 static int 352 __thr_pselect(int count, fd_set *rfds, fd_set *wfds, fd_set *efds, 353 const struct timespec *timo, const sigset_t *mask) 354 { 355 struct pthread *curthread; 356 int ret; 357 358 curthread = _get_curthread(); 359 _thr_cancel_enter(curthread); 360 ret = __sys_pselect(count, rfds, wfds, efds, timo, mask); 361 _thr_cancel_leave(curthread, ret == -1); 362 363 return (ret); 364 } 365 366 static int 367 __thr_kevent(int kq, const struct kevent *changelist, int nchanges, 368 struct kevent *eventlist, int nevents, const struct timespec *timeout) 369 { 370 struct pthread *curthread; 371 int ret; 372 373 if (nevents == 0) { 374 /* 375 * No blocking, do not make the call cancellable. 376 */ 377 return (__sys_kevent(kq, changelist, nchanges, eventlist, 378 nevents, timeout)); 379 } 380 curthread = _get_curthread(); 381 _thr_cancel_enter(curthread); 382 ret = __sys_kevent(kq, changelist, nchanges, eventlist, nevents, 383 timeout); 384 _thr_cancel_leave(curthread, ret == -1 && nchanges == 0); 385 386 return (ret); 387 } 388 389 /* 390 * Cancellation behavior: 391 * Thread may be canceled at start, but if the system call got some data, 392 * the thread is not canceled. 393 */ 394 static ssize_t 395 __thr_read(int fd, void *buf, size_t nbytes) 396 { 397 struct pthread *curthread; 398 ssize_t ret; 399 400 curthread = _get_curthread(); 401 _thr_cancel_enter(curthread); 402 ret = __sys_read(fd, buf, nbytes); 403 _thr_cancel_leave(curthread, ret == -1); 404 405 return (ret); 406 } 407 408 /* 409 * Cancellation behavior: 410 * Thread may be canceled at start, but if the system call got some data, 411 * the thread is not canceled. 412 */ 413 static ssize_t 414 __thr_readv(int fd, const struct iovec *iov, int iovcnt) 415 { 416 struct pthread *curthread; 417 ssize_t ret; 418 419 curthread = _get_curthread(); 420 _thr_cancel_enter(curthread); 421 ret = __sys_readv(fd, iov, iovcnt); 422 _thr_cancel_leave(curthread, ret == -1); 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_recvfrom(int s, void *b, size_t l, int f, struct sockaddr *from, 433 socklen_t *fl) 434 { 435 struct pthread *curthread; 436 ssize_t ret; 437 438 curthread = _get_curthread(); 439 _thr_cancel_enter(curthread); 440 ret = __sys_recvfrom(s, b, l, f, from, fl); 441 _thr_cancel_leave(curthread, ret == -1); 442 return (ret); 443 } 444 445 /* 446 * Cancellation behavior: 447 * Thread may be canceled at start, but if the system call got some data, 448 * the thread is not canceled. 449 */ 450 static ssize_t 451 __thr_recvmsg(int s, struct msghdr *m, int f) 452 { 453 struct pthread *curthread; 454 ssize_t ret; 455 456 curthread = _get_curthread(); 457 _thr_cancel_enter(curthread); 458 ret = __sys_recvmsg(s, m, f); 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 returns something, 466 * the thread is not canceled. 467 */ 468 static int 469 __thr_select(int numfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, 470 struct timeval *timeout) 471 { 472 struct pthread *curthread; 473 int ret; 474 475 curthread = _get_curthread(); 476 _thr_cancel_enter(curthread); 477 ret = __sys_select(numfds, readfds, writefds, exceptfds, timeout); 478 _thr_cancel_leave(curthread, ret == -1); 479 return (ret); 480 } 481 482 /* 483 * Cancellation behavior: 484 * Thread may be canceled at start, but if the system call sent 485 * data, the thread is not canceled. 486 */ 487 static ssize_t 488 __thr_sendmsg(int s, const struct msghdr *m, int f) 489 { 490 struct pthread *curthread; 491 ssize_t ret; 492 493 curthread = _get_curthread(); 494 _thr_cancel_enter(curthread); 495 ret = __sys_sendmsg(s, m, f); 496 _thr_cancel_leave(curthread, ret <= 0); 497 return (ret); 498 } 499 500 /* 501 * Cancellation behavior: 502 * Thread may be canceled at start, but if the system call sent some 503 * data, the thread is not canceled. 504 */ 505 static ssize_t 506 __thr_sendto(int s, const void *m, size_t l, int f, const struct sockaddr *t, 507 socklen_t tl) 508 { 509 struct pthread *curthread; 510 ssize_t ret; 511 512 curthread = _get_curthread(); 513 _thr_cancel_enter(curthread); 514 ret = __sys_sendto(s, m, l, f, t, tl); 515 _thr_cancel_leave(curthread, ret <= 0); 516 return (ret); 517 } 518 519 static int 520 __thr_system(const char *string) 521 { 522 struct pthread *curthread; 523 int ret; 524 525 curthread = _get_curthread(); 526 _thr_cancel_enter(curthread); 527 ret = __libc_system(string); 528 _thr_cancel_leave(curthread, 1); 529 return (ret); 530 } 531 532 /* 533 * Cancellation behavior: 534 * If thread is canceled, the system call is not completed, 535 * this means not all bytes were drained. 536 */ 537 static int 538 __thr_tcdrain(int fd) 539 { 540 struct pthread *curthread; 541 int ret; 542 543 curthread = _get_curthread(); 544 _thr_cancel_enter(curthread); 545 ret = __libc_tcdrain(fd); 546 _thr_cancel_leave(curthread, ret == -1); 547 return (ret); 548 } 549 550 /* 551 * Cancellation behavior: 552 * Thread may be canceled at start, but if the system call returns 553 * a child pid, the thread is not canceled. 554 */ 555 static pid_t 556 __thr_wait4(pid_t pid, int *status, int options, struct rusage *rusage) 557 { 558 struct pthread *curthread; 559 pid_t ret; 560 561 curthread = _get_curthread(); 562 _thr_cancel_enter(curthread); 563 ret = __sys_wait4(pid, status, options, rusage); 564 _thr_cancel_leave(curthread, ret <= 0); 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_wait6(idtype_t idtype, id_t id, int *status, int options, 575 struct __wrusage *ru, siginfo_t *infop) 576 { 577 struct pthread *curthread; 578 pid_t ret; 579 580 curthread = _get_curthread(); 581 _thr_cancel_enter(curthread); 582 ret = __sys_wait6(idtype, id, status, options, ru, infop); 583 _thr_cancel_leave(curthread, ret <= 0); 584 return (ret); 585 } 586 587 /* 588 * Cancellation behavior: 589 * Thread may be canceled at start, but if the thread wrote some data, 590 * it is not canceled. 591 */ 592 static ssize_t 593 __thr_write(int fd, const void *buf, size_t nbytes) 594 { 595 struct pthread *curthread; 596 ssize_t ret; 597 598 curthread = _get_curthread(); 599 _thr_cancel_enter(curthread); 600 ret = __sys_write(fd, buf, nbytes); 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_writev(int fd, const struct iovec *iov, int iovcnt) 612 { 613 struct pthread *curthread; 614 ssize_t ret; 615 616 curthread = _get_curthread(); 617 _thr_cancel_enter(curthread); 618 ret = __sys_writev(fd, iov, iovcnt); 619 _thr_cancel_leave(curthread, (ret <= 0)); 620 return (ret); 621 } 622 623 void 624 __thr_interpose_libc(void) 625 { 626 627 __set_error_selector(__error_threaded); 628 #define SLOT(name) \ 629 *(__libc_interposing_slot(INTERPOS_##name)) = \ 630 (interpos_func_t)__thr_##name; 631 SLOT(system); 632 SLOT(tcdrain); 633 SLOT(spinlock); 634 SLOT(spinunlock); 635 SLOT(map_stacks_exec); 636 #undef SLOT 637 638 #define SLOT(name) \ 639 *(__libc_interposing_slot(INTERPOS_##name)) = \ 640 (interpos_func_t)__thr_##name; 641 SLOT(accept); 642 SLOT(accept4); 643 SLOT(aio_suspend); 644 SLOT(close); 645 SLOT(connect); 646 SLOT(fcntl); 647 SLOT(fsync); 648 SLOT(fork); 649 SLOT(msync); 650 SLOT(nanosleep); 651 SLOT(openat); 652 SLOT(poll); 653 SLOT(pselect); 654 SLOT(read); 655 SLOT(readv); 656 SLOT(recvfrom); 657 SLOT(recvmsg); 658 SLOT(select); 659 SLOT(sendmsg); 660 SLOT(sendto); 661 SLOT(setcontext); 662 SLOT(sigaction); 663 SLOT(sigprocmask); 664 SLOT(sigsuspend); 665 SLOT(sigwait); 666 SLOT(sigtimedwait); 667 SLOT(sigwaitinfo); 668 SLOT(swapcontext); 669 SLOT(wait4); 670 SLOT(write); 671 SLOT(writev); 672 SLOT(kevent); 673 SLOT(wait6); 674 SLOT(ppoll); 675 SLOT(fdatasync); 676 SLOT(clock_nanosleep); 677 SLOT(pdfork); 678 #undef SLOT 679 *(__libc_interposing_slot( 680 INTERPOS__pthread_mutex_init_calloc_cb)) = 681 (interpos_func_t)_pthread_mutex_init_calloc_cb; 682 } 683