t_mmap.c revision 314817
1/* $NetBSD: t_mmap.c,v 1.12 2017/01/16 16:31:05 christos Exp $ */ 2 3/*- 4 * Copyright (c) 2011 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jukka Ruohonen. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32/*- 33 * Copyright (c)2004 YAMAMOTO Takashi, 34 * All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 55 * SUCH DAMAGE. 56 */ 57#include <sys/cdefs.h> 58__RCSID("$NetBSD: t_mmap.c,v 1.12 2017/01/16 16:31:05 christos Exp $"); 59 60#include <sys/param.h> 61#include <sys/disklabel.h> 62#include <sys/mman.h> 63#include <sys/stat.h> 64#include <sys/socket.h> 65#include <sys/sysctl.h> 66#include <sys/wait.h> 67 68#include <atf-c.h> 69#include <errno.h> 70#include <fcntl.h> 71#include <signal.h> 72#include <stdio.h> 73#include <stdlib.h> 74#include <string.h> 75#include <unistd.h> 76#include <paths.h> 77#ifdef __FreeBSD__ 78#include <stdint.h> 79#endif 80 81static long page = 0; 82static char path[] = "mmap"; 83static void map_check(void *, int); 84static void map_sighandler(int); 85static void testloan(void *, void *, char, int); 86 87#define BUFSIZE (32 * 1024) /* enough size to trigger sosend_loan */ 88 89static void 90map_check(void *map, int flag) 91{ 92 93 if (flag != 0) { 94 ATF_REQUIRE(map == MAP_FAILED); 95 return; 96 } 97 98 ATF_REQUIRE(map != MAP_FAILED); 99 ATF_REQUIRE(munmap(map, page) == 0); 100} 101 102void 103testloan(void *vp, void *vp2, char pat, int docheck) 104{ 105 char buf[BUFSIZE]; 106 char backup[BUFSIZE]; 107 ssize_t nwritten; 108 ssize_t nread; 109 int fds[2]; 110 int val; 111 112 val = BUFSIZE; 113 114 if (docheck != 0) 115 (void)memcpy(backup, vp, BUFSIZE); 116 117 if (socketpair(AF_LOCAL, SOCK_STREAM, PF_UNSPEC, fds) != 0) 118 atf_tc_fail("socketpair() failed"); 119 120 val = BUFSIZE; 121 122 if (setsockopt(fds[1], SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)) != 0) 123 atf_tc_fail("setsockopt() failed, SO_RCVBUF"); 124 125 val = BUFSIZE; 126 127 if (setsockopt(fds[0], SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)) != 0) 128 atf_tc_fail("setsockopt() failed, SO_SNDBUF"); 129 130 if (fcntl(fds[0], F_SETFL, O_NONBLOCK) != 0) 131 atf_tc_fail("fcntl() failed"); 132 133 nwritten = write(fds[0], (char *)vp + page, BUFSIZE - page); 134 135 if (nwritten == -1) 136 atf_tc_fail("write() failed"); 137 138 /* Break loan. */ 139 (void)memset(vp2, pat, BUFSIZE); 140 141 nread = read(fds[1], buf + page, BUFSIZE - page); 142 143 if (nread == -1) 144 atf_tc_fail("read() failed"); 145 146 if (nread != nwritten) 147 atf_tc_fail("too short read"); 148 149 if (docheck != 0 && memcmp(backup, buf + page, nread) != 0) 150 atf_tc_fail("data mismatch"); 151 152 ATF_REQUIRE(close(fds[0]) == 0); 153 ATF_REQUIRE(close(fds[1]) == 0); 154} 155 156static void 157map_sighandler(int signo) 158{ 159 _exit(signo); 160} 161 162#ifdef __NetBSD__ 163ATF_TC(mmap_block); 164ATF_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 170ATF_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 (PR kern/38889, kern/46592)"); 179 180 ATF_REQUIRE(sysctl(mib, miblen, NULL, &len, NULL, 0) == 0); 181 drives = malloc(len); 182 ATF_REQUIRE(drives != NULL); 183 ATF_REQUIRE(sysctl(mib, miblen, drives, &len, NULL, 0) == 0); 184 for (dk = strtok(drives, " "); dk != NULL; dk = strtok(NULL, " ")) { 185 sprintf(dev, _PATH_DEV "%s%c", dk, 'a'+RAW_PART); 186 fprintf(stderr, "trying: %s\n", dev); 187 188 if ((fd = open(dev, O_RDONLY)) >= 0) { 189 (void)fprintf(stderr, "using %s\n", dev); 190 break; 191 } 192 } 193 free(drives); 194 195 if (fd < 0) 196 atf_tc_skip("failed to find suitable block device"); 197 198 map = mmap(NULL, 4096, PROT_READ, MAP_FILE, fd, 0); 199 ATF_REQUIRE(map != MAP_FAILED); 200 201 (void)fprintf(stderr, "first byte %x\n", *map); 202 ATF_REQUIRE(close(fd) == 0); 203 (void)fprintf(stderr, "first byte %x\n", *map); 204 205 ATF_REQUIRE(munmap(map, 4096) == 0); 206} 207#endif 208 209ATF_TC(mmap_err); 210ATF_TC_HEAD(mmap_err, tc) 211{ 212 atf_tc_set_md_var(tc, "descr", "Test error conditions of mmap(2)"); 213} 214 215ATF_TC_BODY(mmap_err, tc) 216{ 217 size_t addr = SIZE_MAX; 218 void *map; 219 220 errno = 0; 221 map = mmap(NULL, 3, PROT_READ, MAP_FILE|MAP_PRIVATE, -1, 0); 222 223 ATF_REQUIRE(map == MAP_FAILED); 224 ATF_REQUIRE(errno == EBADF); 225 226 errno = 0; 227 map = mmap(&addr, page, PROT_READ, MAP_FIXED|MAP_PRIVATE, -1, 0); 228 229 ATF_REQUIRE(map == MAP_FAILED); 230 ATF_REQUIRE(errno == EINVAL); 231 232 errno = 0; 233 map = mmap(NULL, page, PROT_READ, MAP_ANON|MAP_PRIVATE, INT_MAX, 0); 234 235 ATF_REQUIRE(map == MAP_FAILED); 236 ATF_REQUIRE(errno == EINVAL); 237} 238 239ATF_TC_WITH_CLEANUP(mmap_loan); 240ATF_TC_HEAD(mmap_loan, tc) 241{ 242 atf_tc_set_md_var(tc, "descr", "Test uvm page loanout with mmap(2)"); 243} 244 245ATF_TC_BODY(mmap_loan, tc) 246{ 247 char buf[BUFSIZE]; 248 char *vp, *vp2; 249 int fd; 250 251 fd = open(path, O_RDWR | O_CREAT, 0600); 252 ATF_REQUIRE(fd >= 0); 253 254 (void)memset(buf, 'x', sizeof(buf)); 255 (void)write(fd, buf, sizeof(buf)); 256 257 vp = mmap(NULL, BUFSIZE, PROT_READ | PROT_WRITE, 258 MAP_FILE | MAP_PRIVATE, fd, 0); 259 260 ATF_REQUIRE(vp != MAP_FAILED); 261 262 vp2 = vp; 263 264 testloan(vp, vp2, 'A', 0); 265 testloan(vp, vp2, 'B', 1); 266 267 ATF_REQUIRE(munmap(vp, BUFSIZE) == 0); 268 269 vp = mmap(NULL, BUFSIZE, PROT_READ | PROT_WRITE, 270 MAP_FILE | MAP_SHARED, fd, 0); 271 272 vp2 = mmap(NULL, BUFSIZE, PROT_READ | PROT_WRITE, 273 MAP_FILE | MAP_SHARED, fd, 0); 274 275 ATF_REQUIRE(vp != MAP_FAILED); 276 ATF_REQUIRE(vp2 != MAP_FAILED); 277 278 testloan(vp, vp2, 'E', 1); 279 280 ATF_REQUIRE(munmap(vp, BUFSIZE) == 0); 281 ATF_REQUIRE(munmap(vp2, BUFSIZE) == 0); 282} 283 284ATF_TC_CLEANUP(mmap_loan, tc) 285{ 286 (void)unlink(path); 287} 288 289ATF_TC_WITH_CLEANUP(mmap_prot_1); 290ATF_TC_HEAD(mmap_prot_1, tc) 291{ 292 atf_tc_set_md_var(tc, "descr", "Test mmap(2) protections, #1"); 293} 294 295ATF_TC_BODY(mmap_prot_1, tc) 296{ 297 void *map; 298 int fd; 299 300 /* 301 * Open a file write-only and try to 302 * map it read-only. This should fail. 303 */ 304 fd = open(path, O_WRONLY | O_CREAT, 0700); 305 306 if (fd < 0) 307 return; 308 309 ATF_REQUIRE(write(fd, "XXX", 3) == 3); 310 311 map = mmap(NULL, 3, PROT_READ, MAP_FILE|MAP_PRIVATE, fd, 0); 312 map_check(map, 1); 313 314 map = mmap(NULL, 3, PROT_WRITE, MAP_FILE|MAP_PRIVATE, fd, 0); 315 map_check(map, 0); 316 317 ATF_REQUIRE(close(fd) == 0); 318} 319 320ATF_TC_CLEANUP(mmap_prot_1, tc) 321{ 322 (void)unlink(path); 323} 324 325ATF_TC(mmap_prot_2); 326ATF_TC_HEAD(mmap_prot_2, tc) 327{ 328 atf_tc_set_md_var(tc, "descr", "Test mmap(2) protections, #2"); 329} 330 331ATF_TC_BODY(mmap_prot_2, tc) 332{ 333 char buf[2]; 334 void *map; 335 pid_t pid; 336 int sta; 337 338 /* 339 * Make a PROT_NONE mapping and try to access it. 340 * If we catch a SIGSEGV, all works as expected. 341 */ 342 map = mmap(NULL, page, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0); 343 ATF_REQUIRE(map != MAP_FAILED); 344 345 pid = fork(); 346 ATF_REQUIRE(pid >= 0); 347 348 if (pid == 0) { 349 ATF_REQUIRE(signal(SIGSEGV, map_sighandler) != SIG_ERR); 350 ATF_REQUIRE(strlcpy(buf, map, sizeof(buf)) != 0); 351 } 352 353 (void)wait(&sta); 354 355 ATF_REQUIRE(WIFEXITED(sta) != 0); 356 ATF_REQUIRE(WEXITSTATUS(sta) == SIGSEGV); 357 ATF_REQUIRE(munmap(map, page) == 0); 358} 359 360ATF_TC_WITH_CLEANUP(mmap_prot_3); 361ATF_TC_HEAD(mmap_prot_3, tc) 362{ 363 atf_tc_set_md_var(tc, "descr", "Test mmap(2) protections, #3"); 364} 365 366ATF_TC_BODY(mmap_prot_3, tc) 367{ 368 char buf[2]; 369 int fd, sta; 370 void *map; 371 pid_t pid; 372 373 /* 374 * Open a file, change the permissions 375 * to read-only, and try to map it as 376 * PROT_NONE. This should succeed, but 377 * the access should generate SIGSEGV. 378 */ 379 fd = open(path, O_RDWR | O_CREAT, 0700); 380 381 if (fd < 0) 382#ifdef __FreeBSD__ 383 atf_tc_skip("opening %s failed; skipping testcase: %s", 384 path, strerror(errno)); 385#else 386 return; 387#endif 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#ifdef __FreeBSD__ 414 (void)close(fd); 415#endif 416} 417 418ATF_TC_CLEANUP(mmap_prot_3, tc) 419{ 420 (void)unlink(path); 421} 422 423ATF_TC_WITH_CLEANUP(mmap_truncate); 424ATF_TC_HEAD(mmap_truncate, tc) 425{ 426 atf_tc_set_md_var(tc, "descr", "Test mmap(2) and ftruncate(2)"); 427} 428 429ATF_TC_BODY(mmap_truncate, tc) 430{ 431 char *map; 432 long i; 433 int fd; 434 435 fd = open(path, O_RDWR | O_CREAT, 0700); 436 437 if (fd < 0) 438 return; 439 440 /* 441 * See that ftruncate(2) works 442 * while the file is mapped. 443 */ 444 ATF_REQUIRE(ftruncate(fd, page) == 0); 445 446 map = mmap(NULL, page, PROT_READ | PROT_WRITE, MAP_FILE|MAP_PRIVATE, 447 fd, 0); 448 ATF_REQUIRE(map != MAP_FAILED); 449 450 for (i = 0; i < page; i++) 451 map[i] = 'x'; 452 453 ATF_REQUIRE(ftruncate(fd, 0) == 0); 454 ATF_REQUIRE(ftruncate(fd, page / 8) == 0); 455 ATF_REQUIRE(ftruncate(fd, page / 4) == 0); 456 ATF_REQUIRE(ftruncate(fd, page / 2) == 0); 457 ATF_REQUIRE(ftruncate(fd, page / 12) == 0); 458 ATF_REQUIRE(ftruncate(fd, page / 64) == 0); 459 460 (void)munmap(map, page); 461 ATF_REQUIRE(close(fd) == 0); 462} 463 464ATF_TC_CLEANUP(mmap_truncate, tc) 465{ 466 (void)unlink(path); 467} 468 469ATF_TC_WITH_CLEANUP(mmap_truncate_signal); 470ATF_TC_HEAD(mmap_truncate_signal, tc) 471{ 472 atf_tc_set_md_var(tc, "descr", 473 "Test mmap(2) ftruncate(2) causing signal"); 474} 475 476ATF_TC_BODY(mmap_truncate_signal, tc) 477{ 478 char *map; 479 long i; 480 int fd, sta; 481 pid_t pid; 482 483#ifdef __FreeBSD__ 484 atf_tc_expect_fail("testcase fails with SIGSEGV on FreeBSD; bug # 211924"); 485#endif 486 487 fd = open(path, O_RDWR | O_CREAT, 0700); 488 489 if (fd < 0) 490 return; 491 492 ATF_REQUIRE(write(fd, "foo\n", 5) == 5); 493 494 map = mmap(NULL, page, PROT_READ, MAP_FILE|MAP_PRIVATE, fd, 0); 495 ATF_REQUIRE(map != MAP_FAILED); 496 497 sta = 0; 498 for (i = 0; i < 5; i++) 499 sta += map[i]; 500 ATF_REQUIRE(sta == 334); 501 502 ATF_REQUIRE(ftruncate(fd, 0) == 0); 503 pid = fork(); 504 ATF_REQUIRE(pid >= 0); 505 506 if (pid == 0) { 507 ATF_REQUIRE(signal(SIGBUS, map_sighandler) != SIG_ERR); 508 ATF_REQUIRE(signal(SIGSEGV, map_sighandler) != SIG_ERR); 509 sta = 0; 510 for (i = 0; i < page; i++) 511 sta += map[i]; 512 /* child never will get this far, but the compiler will 513 not know, so better use the values calculated to 514 prevent the access to be optimized out */ 515 ATF_REQUIRE(i == 0); 516 ATF_REQUIRE(sta == 0); 517 (void)munmap(map, page); 518 (void)close(fd); 519 return; 520 } 521 522 (void)wait(&sta); 523 524 ATF_REQUIRE(WIFEXITED(sta) != 0); 525 if (WEXITSTATUS(sta) == SIGSEGV) 526 atf_tc_fail("child process got SIGSEGV instead of SIGBUS"); 527 ATF_REQUIRE(WEXITSTATUS(sta) == SIGBUS); 528 ATF_REQUIRE(munmap(map, page) == 0); 529 ATF_REQUIRE(close(fd) == 0); 530} 531 532ATF_TC_CLEANUP(mmap_truncate_signal, tc) 533{ 534 (void)unlink(path); 535} 536 537ATF_TC(mmap_va0); 538ATF_TC_HEAD(mmap_va0, tc) 539{ 540 atf_tc_set_md_var(tc, "descr", "Test mmap(2) and vm.user_va0_disable"); 541} 542 543ATF_TC_BODY(mmap_va0, tc) 544{ 545 int flags = MAP_ANON | MAP_FIXED | MAP_PRIVATE; 546 size_t len = sizeof(int); 547 void *map; 548 int val; 549 550 /* 551 * Make an anonymous fixed mapping at zero address. If the address 552 * is restricted as noted in security(7), the syscall should fail. 553 */ 554#ifdef __FreeBSD__ 555 if (sysctlbyname("security.bsd.map_at_zero", &val, &len, NULL, 0) != 0) 556 atf_tc_fail("failed to read security.bsd.map_at_zero"); 557 val = !val; /* 1 == enable map at zero */ 558#endif 559#ifdef __NetBSD__ 560 if (sysctlbyname("vm.user_va0_disable", &val, &len, NULL, 0) != 0) 561 atf_tc_fail("failed to read vm.user_va0_disable"); 562#endif 563 564 map = mmap(NULL, page, PROT_EXEC, flags, -1, 0); 565 map_check(map, val); 566 567 map = mmap(NULL, page, PROT_READ, flags, -1, 0); 568 map_check(map, val); 569 570 map = mmap(NULL, page, PROT_WRITE, flags, -1, 0); 571 map_check(map, val); 572 573 map = mmap(NULL, page, PROT_READ|PROT_WRITE, flags, -1, 0); 574 map_check(map, val); 575 576 map = mmap(NULL, page, PROT_EXEC|PROT_READ|PROT_WRITE, flags, -1, 0); 577 map_check(map, val); 578} 579 580ATF_TP_ADD_TCS(tp) 581{ 582 page = sysconf(_SC_PAGESIZE); 583 ATF_REQUIRE(page >= 0); 584 585#ifdef __NetBSD__ 586 ATF_TP_ADD_TC(tp, mmap_block); 587#endif 588 ATF_TP_ADD_TC(tp, mmap_err); 589 ATF_TP_ADD_TC(tp, mmap_loan); 590 ATF_TP_ADD_TC(tp, mmap_prot_1); 591 ATF_TP_ADD_TC(tp, mmap_prot_2); 592 ATF_TP_ADD_TC(tp, mmap_prot_3); 593 ATF_TP_ADD_TC(tp, mmap_truncate); 594 ATF_TP_ADD_TC(tp, mmap_truncate_signal); 595 ATF_TP_ADD_TC(tp, mmap_va0); 596 597 return atf_no_error(); 598} 599