1 /* $OpenBSD: t_mmap.c,v 1.2 2020/11/09 23:18:51 bluhm Exp $ */ 2 /* $NetBSD: t_mmap.c,v 1.14 2020/06/26 07:50:11 jruoho Exp $ */ 3 4 /*- 5 * Copyright (c) 2011 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Jukka Ruohonen. 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, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /*- 34 * Copyright (c)2004 YAMAMOTO Takashi, 35 * All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 46 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 47 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 48 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 49 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 50 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 51 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 52 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 54 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 55 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 56 * SUCH DAMAGE. 57 */ 58 59 #include "macros.h" 60 61 #include <sys/cdefs.h> 62 __RCSID("$NetBSD: t_mmap.c,v 1.14 2020/06/26 07:50:11 jruoho Exp $"); 63 64 #include <sys/param.h> 65 #include <sys/disklabel.h> 66 #include <sys/mman.h> 67 #include <sys/stat.h> 68 #include <sys/socket.h> 69 #include <sys/sysctl.h> 70 #include <sys/wait.h> 71 72 #include "atf-c.h" 73 #include <errno.h> 74 #include <fcntl.h> 75 #include <signal.h> 76 #include <stdio.h> 77 #include <stdlib.h> 78 #include <string.h> 79 #include <unistd.h> 80 #include <paths.h> 81 82 static long page = 0; 83 static char path[] = "mmap"; 84 static void map_check(void *, int); 85 static void map_sighandler(int); 86 static void testloan(void *, void *, char, int); 87 88 #define BUFSIZE (32 * 1024) /* enough size to trigger sosend_loan */ 89 90 static void 91 map_check(void *map, int flag) 92 { 93 94 if (flag != 0) { 95 ATF_REQUIRE(map == MAP_FAILED); 96 return; 97 } 98 99 ATF_REQUIRE(map != MAP_FAILED); 100 ATF_REQUIRE(munmap(map, page) == 0); 101 } 102 103 void 104 testloan(void *vp, void *vp2, char pat, int docheck) 105 { 106 char buf[BUFSIZE]; 107 char backup[BUFSIZE]; 108 ssize_t nwritten; 109 ssize_t nread; 110 int fds[2]; 111 int val; 112 113 val = BUFSIZE; 114 115 if (docheck != 0) 116 (void)memcpy(backup, vp, BUFSIZE); 117 118 if (socketpair(AF_LOCAL, SOCK_STREAM, PF_UNSPEC, fds) != 0) 119 atf_tc_fail("socketpair() failed"); 120 121 val = BUFSIZE; 122 123 if (setsockopt(fds[1], SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)) != 0) 124 atf_tc_fail("setsockopt() failed, SO_RCVBUF"); 125 126 val = BUFSIZE; 127 128 if (setsockopt(fds[0], SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)) != 0) 129 atf_tc_fail("setsockopt() failed, SO_SNDBUF"); 130 131 if (fcntl(fds[0], F_SETFL, O_NONBLOCK) != 0) 132 atf_tc_fail("fcntl() failed"); 133 134 nwritten = write(fds[0], (char *)vp + page, BUFSIZE - page); 135 136 if (nwritten == -1) 137 atf_tc_fail("write() failed"); 138 139 /* Break loan. */ 140 (void)memset(vp2, pat, BUFSIZE); 141 142 nread = read(fds[1], buf + page, BUFSIZE - page); 143 144 if (nread == -1) 145 atf_tc_fail("read() failed"); 146 147 if (nread != nwritten) 148 atf_tc_fail("too short read"); 149 150 if (docheck != 0 && memcmp(backup, buf + page, nread) != 0) 151 atf_tc_fail("data mismatch"); 152 153 ATF_REQUIRE(close(fds[0]) == 0); 154 ATF_REQUIRE(close(fds[1]) == 0); 155 } 156 157 static void 158 map_sighandler(int signo) 159 { 160 _exit(signo); 161 } 162 163 ATF_TC(mmap_block); 164 ATF_TC_HEAD(mmap_block, tc) 165 { 166 atf_tc_set_md_var(tc, "descr", "Test mmap(2) with a block device"); 167 atf_tc_set_md_var(tc, "require.user", "root"); 168 } 169 170 ATF_TC_BODY(mmap_block, tc) 171 { 172 static const int mib[] = { CTL_HW, HW_DISKNAMES }; 173 static const unsigned int miblen = __arraycount(mib); 174 char *map, *dk, *drives, dev[PATH_MAX]; 175 size_t len; 176 int fd = -1; 177 178 atf_tc_skip("The test case causes a panic " \ 179 "(PR kern/38889, PR kern/46592)"); 180 181 ATF_REQUIRE(sysctl(mib, miblen, NULL, &len, NULL, 0) == 0); 182 drives = malloc(len); 183 ATF_REQUIRE(drives != NULL); 184 ATF_REQUIRE(sysctl(mib, miblen, drives, &len, NULL, 0) == 0); 185 for (dk = strtok(drives, " "); dk != NULL; dk = strtok(NULL, " ")) { 186 if (strncmp(dk, "dk", 2) == 0) 187 snprintf(dev, sizeof(dev), _PATH_DEV "%s", dk); 188 else 189 snprintf(dev, sizeof(dev), _PATH_DEV "%s%c", dk, 190 'a' + RAW_PART); 191 fprintf(stderr, "trying: %s\n", dev); 192 193 if ((fd = open(dev, O_RDONLY)) >= 0) { 194 (void)fprintf(stderr, "using %s\n", dev); 195 break; 196 } else 197 (void)fprintf(stderr, "%s: %s\n", dev, strerror(errno)); 198 } 199 free(drives); 200 201 if (fd < 0) 202 atf_tc_skip("failed to find suitable block device"); 203 204 map = mmap(NULL, 4096, PROT_READ, MAP_FILE, fd, 0); 205 ATF_REQUIRE_MSG(map != MAP_FAILED, "mmap: %s", strerror(errno)); 206 207 (void)fprintf(stderr, "first byte %x\n", *map); 208 ATF_REQUIRE(close(fd) == 0); 209 (void)fprintf(stderr, "first byte %x\n", *map); 210 211 ATF_REQUIRE(munmap(map, 4096) == 0); 212 } 213 214 ATF_TC(mmap_err); 215 ATF_TC_HEAD(mmap_err, tc) 216 { 217 atf_tc_set_md_var(tc, "descr", "Test error conditions of mmap(2)"); 218 } 219 220 ATF_TC_BODY(mmap_err, tc) 221 { 222 size_t addr = SIZE_MAX; 223 void *map; 224 225 errno = 0; 226 map = mmap(NULL, 3, PROT_READ, MAP_FILE|MAP_PRIVATE, -1, 0); 227 228 ATF_REQUIRE(map == MAP_FAILED); 229 ATF_REQUIRE(errno == EBADF); 230 231 errno = 0; 232 map = mmap(&addr, page, PROT_READ, MAP_FIXED|MAP_PRIVATE, -1, 0); 233 234 ATF_REQUIRE(map == MAP_FAILED); 235 ATF_REQUIRE(errno == EINVAL); 236 237 errno = 0; 238 map = mmap(NULL, page, PROT_READ, MAP_ANON|MAP_PRIVATE, INT_MAX, 0); 239 240 ATF_REQUIRE(map == MAP_FAILED); 241 ATF_REQUIRE(errno == EINVAL); 242 } 243 244 ATF_TC_WITH_CLEANUP(mmap_loan); 245 ATF_TC_HEAD(mmap_loan, tc) 246 { 247 atf_tc_set_md_var(tc, "descr", "Test uvm page loanout with mmap(2)"); 248 } 249 250 ATF_TC_BODY(mmap_loan, tc) 251 { 252 char buf[BUFSIZE]; 253 char *vp, *vp2; 254 int fd; 255 256 fd = open(path, O_RDWR | O_CREAT, 0600); 257 ATF_REQUIRE(fd >= 0); 258 259 (void)memset(buf, 'x', sizeof(buf)); 260 (void)write(fd, buf, sizeof(buf)); 261 262 vp = mmap(NULL, BUFSIZE, PROT_READ | PROT_WRITE, 263 MAP_FILE | MAP_PRIVATE, fd, 0); 264 265 ATF_REQUIRE(vp != MAP_FAILED); 266 267 vp2 = vp; 268 269 testloan(vp, vp2, 'A', 0); 270 testloan(vp, vp2, 'B', 1); 271 272 ATF_REQUIRE(munmap(vp, BUFSIZE) == 0); 273 274 vp = mmap(NULL, BUFSIZE, PROT_READ | PROT_WRITE, 275 MAP_FILE | MAP_SHARED, fd, 0); 276 277 vp2 = mmap(NULL, BUFSIZE, PROT_READ | PROT_WRITE, 278 MAP_FILE | MAP_SHARED, fd, 0); 279 280 ATF_REQUIRE(vp != MAP_FAILED); 281 ATF_REQUIRE(vp2 != MAP_FAILED); 282 283 testloan(vp, vp2, 'E', 1); 284 285 ATF_REQUIRE(munmap(vp, BUFSIZE) == 0); 286 ATF_REQUIRE(munmap(vp2, BUFSIZE) == 0); 287 } 288 289 ATF_TC_CLEANUP(mmap_loan, tc) 290 { 291 (void)unlink(path); 292 } 293 294 ATF_TC_WITH_CLEANUP(mmap_prot_1); 295 ATF_TC_HEAD(mmap_prot_1, tc) 296 { 297 atf_tc_set_md_var(tc, "descr", "Test mmap(2) protections, #1"); 298 } 299 300 ATF_TC_BODY(mmap_prot_1, tc) 301 { 302 void *map; 303 int fd; 304 305 /* 306 * Open a file write-only and try to 307 * map it read-only. This should fail. 308 */ 309 fd = open(path, O_WRONLY | O_CREAT, 0700); 310 311 if (fd < 0) 312 return; 313 314 ATF_REQUIRE(write(fd, "XXX", 3) == 3); 315 316 map = mmap(NULL, 3, PROT_READ, MAP_FILE|MAP_PRIVATE, fd, 0); 317 map_check(map, 1); 318 319 map = mmap(NULL, 3, PROT_WRITE, MAP_FILE|MAP_PRIVATE, fd, 0); 320 map_check(map, 0); 321 322 ATF_REQUIRE(close(fd) == 0); 323 } 324 325 ATF_TC_CLEANUP(mmap_prot_1, tc) 326 { 327 (void)unlink(path); 328 } 329 330 ATF_TC(mmap_prot_2); 331 ATF_TC_HEAD(mmap_prot_2, tc) 332 { 333 atf_tc_set_md_var(tc, "descr", "Test mmap(2) protections, #2"); 334 } 335 336 ATF_TC_BODY(mmap_prot_2, tc) 337 { 338 char buf[2]; 339 void *map; 340 pid_t pid; 341 int sta; 342 343 /* 344 * Make a PROT_NONE mapping and try to access it. 345 * If we catch a SIGSEGV, all works as expected. 346 */ 347 map = mmap(NULL, page, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0); 348 ATF_REQUIRE(map != MAP_FAILED); 349 350 pid = fork(); 351 ATF_REQUIRE(pid >= 0); 352 353 if (pid == 0) { 354 ATF_REQUIRE(signal(SIGSEGV, map_sighandler) != SIG_ERR); 355 ATF_REQUIRE(strlcpy(buf, map, sizeof(buf)) != 0); 356 } 357 358 (void)wait(&sta); 359 360 ATF_REQUIRE(WIFEXITED(sta) != 0); 361 ATF_REQUIRE(WEXITSTATUS(sta) == SIGSEGV); 362 ATF_REQUIRE(munmap(map, page) == 0); 363 } 364 365 ATF_TC_WITH_CLEANUP(mmap_prot_3); 366 ATF_TC_HEAD(mmap_prot_3, tc) 367 { 368 atf_tc_set_md_var(tc, "descr", "Test mmap(2) protections, #3"); 369 } 370 371 ATF_TC_BODY(mmap_prot_3, tc) 372 { 373 char buf[2]; 374 int fd, sta; 375 void *map; 376 pid_t pid; 377 378 /* 379 * Open a file, change the permissions 380 * to read-only, and try to map it as 381 * PROT_NONE. This should succeed, but 382 * the access should generate SIGSEGV. 383 */ 384 fd = open(path, O_RDWR | O_CREAT, 0700); 385 386 if (fd < 0) 387 return; 388 389 ATF_REQUIRE(write(fd, "XXX", 3) == 3); 390 ATF_REQUIRE(close(fd) == 0); 391 ATF_REQUIRE(chmod(path, 0444) == 0); 392 393 fd = open(path, O_RDONLY); 394 ATF_REQUIRE(fd != -1); 395 396 map = mmap(NULL, 3, PROT_NONE, MAP_FILE | MAP_SHARED, fd, 0); 397 ATF_REQUIRE(map != MAP_FAILED); 398 399 pid = fork(); 400 401 ATF_REQUIRE(pid >= 0); 402 403 if (pid == 0) { 404 ATF_REQUIRE(signal(SIGSEGV, map_sighandler) != SIG_ERR); 405 ATF_REQUIRE(strlcpy(buf, map, sizeof(buf)) != 0); 406 } 407 408 (void)wait(&sta); 409 410 ATF_REQUIRE(WIFEXITED(sta) != 0); 411 ATF_REQUIRE(WEXITSTATUS(sta) == SIGSEGV); 412 ATF_REQUIRE(munmap(map, 3) == 0); 413 } 414 415 ATF_TC_CLEANUP(mmap_prot_3, tc) 416 { 417 (void)unlink(path); 418 } 419 420 ATF_TC_WITH_CLEANUP(mmap_truncate); 421 ATF_TC_HEAD(mmap_truncate, tc) 422 { 423 atf_tc_set_md_var(tc, "descr", "Test mmap(2) and ftruncate(2)"); 424 } 425 426 ATF_TC_BODY(mmap_truncate, tc) 427 { 428 char *map; 429 long i; 430 int fd; 431 432 fd = open(path, O_RDWR | O_CREAT, 0700); 433 434 if (fd < 0) 435 return; 436 437 /* 438 * See that ftruncate(2) works 439 * while the file is mapped. 440 */ 441 ATF_REQUIRE(ftruncate(fd, page) == 0); 442 443 map = mmap(NULL, page, PROT_READ | PROT_WRITE, MAP_FILE|MAP_PRIVATE, 444 fd, 0); 445 ATF_REQUIRE(map != MAP_FAILED); 446 447 for (i = 0; i < page; i++) 448 map[i] = 'x'; 449 450 ATF_REQUIRE(ftruncate(fd, 0) == 0); 451 ATF_REQUIRE(ftruncate(fd, page / 8) == 0); 452 ATF_REQUIRE(ftruncate(fd, page / 4) == 0); 453 ATF_REQUIRE(ftruncate(fd, page / 2) == 0); 454 ATF_REQUIRE(ftruncate(fd, page / 12) == 0); 455 ATF_REQUIRE(ftruncate(fd, page / 64) == 0); 456 457 (void)munmap(map, page); 458 ATF_REQUIRE(close(fd) == 0); 459 } 460 461 ATF_TC_CLEANUP(mmap_truncate, tc) 462 { 463 (void)unlink(path); 464 } 465 466 ATF_TC_WITH_CLEANUP(mmap_truncate_signal); 467 ATF_TC_HEAD(mmap_truncate_signal, tc) 468 { 469 atf_tc_set_md_var(tc, "descr", 470 "Test mmap(2) ftruncate(2) causing signal"); 471 } 472 473 ATF_TC_BODY(mmap_truncate_signal, tc) 474 { 475 char *map; 476 long i; 477 int fd, sta; 478 pid_t pid; 479 480 fd = open(path, O_RDWR | O_CREAT, 0700); 481 482 if (fd < 0) 483 return; 484 485 ATF_REQUIRE(write(fd, "foo\n", 5) == 5); 486 487 map = mmap(NULL, page, PROT_READ, MAP_FILE|MAP_PRIVATE, fd, 0); 488 ATF_REQUIRE(map != MAP_FAILED); 489 490 sta = 0; 491 for (i = 0; i < 5; i++) 492 sta += map[i]; 493 ATF_REQUIRE(sta == 334); 494 495 ATF_REQUIRE(ftruncate(fd, 0) == 0); 496 pid = fork(); 497 ATF_REQUIRE(pid >= 0); 498 499 if (pid == 0) { 500 ATF_REQUIRE(signal(SIGBUS, map_sighandler) != SIG_ERR); 501 ATF_REQUIRE(signal(SIGSEGV, map_sighandler) != SIG_ERR); 502 sta = 0; 503 for (i = 0; i < page; i++) 504 sta += map[i]; 505 /* child never will get this far, but the compiler will 506 not know, so better use the values calculated to 507 prevent the access to be optimized out */ 508 ATF_REQUIRE(i == 0); 509 ATF_REQUIRE(sta == 0); 510 (void)munmap(map, page); 511 (void)close(fd); 512 return; 513 } 514 515 (void)wait(&sta); 516 517 ATF_REQUIRE(WIFEXITED(sta) != 0); 518 if (WEXITSTATUS(sta) == SIGSEGV) 519 atf_tc_fail("child process got SIGSEGV instead of SIGBUS"); 520 ATF_REQUIRE(WEXITSTATUS(sta) == SIGBUS); 521 ATF_REQUIRE(munmap(map, page) == 0); 522 ATF_REQUIRE(close(fd) == 0); 523 } 524 525 ATF_TC_CLEANUP(mmap_truncate_signal, tc) 526 { 527 (void)unlink(path); 528 } 529 530 ATF_TC(mmap_va0); 531 ATF_TC_HEAD(mmap_va0, tc) 532 { 533 atf_tc_set_md_var(tc, "descr", "Test mmap(2) and vm.user_va0_disable"); 534 } 535 536 ATF_TC_BODY(mmap_va0, tc) 537 { 538 int flags = MAP_ANON | MAP_FIXED | MAP_PRIVATE; 539 size_t len = sizeof(int); 540 void *map; 541 int val; 542 543 /* 544 * Make an anonymous fixed mapping at zero address. If the address 545 * is restricted as noted in security(7), the syscall should fail. 546 */ 547 if (sysctlbyname("vm.user_va0_disable", &val, &len, NULL, 0) != 0) 548 atf_tc_fail("failed to read vm.user_va0_disable"); 549 550 map = mmap(NULL, page, PROT_EXEC, flags, -1, 0); 551 map_check(map, val); 552 553 map = mmap(NULL, page, PROT_READ, flags, -1, 0); 554 map_check(map, val); 555 556 map = mmap(NULL, page, PROT_WRITE, flags, -1, 0); 557 map_check(map, val); 558 559 map = mmap(NULL, page, PROT_READ|PROT_WRITE, flags, -1, 0); 560 map_check(map, val); 561 562 map = mmap(NULL, page, PROT_EXEC|PROT_READ|PROT_WRITE, flags, -1, 0); 563 map_check(map, val); 564 } 565 566 ATF_TP_ADD_TCS(tp) 567 { 568 page = sysconf(_SC_PAGESIZE); 569 ATF_REQUIRE(page >= 0); 570 571 ATF_TP_ADD_TC(tp, mmap_block); 572 ATF_TP_ADD_TC(tp, mmap_err); 573 ATF_TP_ADD_TC(tp, mmap_loan); 574 ATF_TP_ADD_TC(tp, mmap_prot_1); 575 ATF_TP_ADD_TC(tp, mmap_prot_2); 576 ATF_TP_ADD_TC(tp, mmap_prot_3); 577 ATF_TP_ADD_TC(tp, mmap_truncate); 578 ATF_TP_ADD_TC(tp, mmap_truncate_signal); 579 #ifndef __OpenBSD__ 580 /* sysctl vm.user_va0_disable not available */ 581 ATF_TP_ADD_TC(tp, mmap_va0); 582 #endif 583 584 return atf_no_error(); 585 } 586