1 /*- 2 * Copyright (c) 1988 University of Utah. 3 * Copyright (c) 1991, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * the Systems Programming Group of the University of Utah Computer 8 * Science Department. 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 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$ 35 * 36 * @(#)vm_mmap.c 8.4 (Berkeley) 1/12/94 37 */ 38 39 /* 40 * Mapped file (mmap) interface to VM 41 */ 42 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 #include "opt_compat.h" 47 #include "opt_hwpmc_hooks.h" 48 #include "opt_vm.h" 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/capsicum.h> 53 #include <sys/kernel.h> 54 #include <sys/lock.h> 55 #include <sys/mutex.h> 56 #include <sys/sysproto.h> 57 #include <sys/filedesc.h> 58 #include <sys/priv.h> 59 #include <sys/proc.h> 60 #include <sys/procctl.h> 61 #include <sys/racct.h> 62 #include <sys/resource.h> 63 #include <sys/resourcevar.h> 64 #include <sys/rwlock.h> 65 #include <sys/sysctl.h> 66 #include <sys/vnode.h> 67 #include <sys/fcntl.h> 68 #include <sys/file.h> 69 #include <sys/mman.h> 70 #include <sys/mount.h> 71 #include <sys/conf.h> 72 #include <sys/stat.h> 73 #include <sys/syscallsubr.h> 74 #include <sys/sysent.h> 75 #include <sys/vmmeter.h> 76 77 #include <security/audit/audit.h> 78 #include <security/mac/mac_framework.h> 79 80 #include <vm/vm.h> 81 #include <vm/vm_param.h> 82 #include <vm/pmap.h> 83 #include <vm/vm_map.h> 84 #include <vm/vm_object.h> 85 #include <vm/vm_page.h> 86 #include <vm/vm_pager.h> 87 #include <vm/vm_pageout.h> 88 #include <vm/vm_extern.h> 89 #include <vm/vm_page.h> 90 #include <vm/vnode_pager.h> 91 92 #ifdef HWPMC_HOOKS 93 #include <sys/pmckern.h> 94 #endif 95 96 int old_mlock = 0; 97 SYSCTL_INT(_vm, OID_AUTO, old_mlock, CTLFLAG_RWTUN, &old_mlock, 0, 98 "Do not apply RLIMIT_MEMLOCK on mlockall"); 99 100 #ifdef MAP_32BIT 101 #define MAP_32BIT_MAX_ADDR ((vm_offset_t)1 << 31) 102 #endif 103 104 #ifndef _SYS_SYSPROTO_H_ 105 struct sbrk_args { 106 int incr; 107 }; 108 #endif 109 110 int 111 sys_sbrk(struct thread *td, struct sbrk_args *uap) 112 { 113 /* Not yet implemented */ 114 return (EOPNOTSUPP); 115 } 116 117 #ifndef _SYS_SYSPROTO_H_ 118 struct sstk_args { 119 int incr; 120 }; 121 #endif 122 123 int 124 sys_sstk(struct thread *td, struct sstk_args *uap) 125 { 126 /* Not yet implemented */ 127 return (EOPNOTSUPP); 128 } 129 130 #if defined(COMPAT_43) 131 #ifndef _SYS_SYSPROTO_H_ 132 struct getpagesize_args { 133 int dummy; 134 }; 135 #endif 136 137 int 138 ogetpagesize(struct thread *td, struct getpagesize_args *uap) 139 { 140 141 td->td_retval[0] = PAGE_SIZE; 142 return (0); 143 } 144 #endif /* COMPAT_43 */ 145 146 147 /* 148 * Memory Map (mmap) system call. Note that the file offset 149 * and address are allowed to be NOT page aligned, though if 150 * the MAP_FIXED flag it set, both must have the same remainder 151 * modulo the PAGE_SIZE (POSIX 1003.1b). If the address is not 152 * page-aligned, the actual mapping starts at trunc_page(addr) 153 * and the return value is adjusted up by the page offset. 154 * 155 * Generally speaking, only character devices which are themselves 156 * memory-based, such as a video framebuffer, can be mmap'd. Otherwise 157 * there would be no cache coherency between a descriptor and a VM mapping 158 * both to the same character device. 159 */ 160 #ifndef _SYS_SYSPROTO_H_ 161 struct mmap_args { 162 void *addr; 163 size_t len; 164 int prot; 165 int flags; 166 int fd; 167 long pad; 168 off_t pos; 169 }; 170 #endif 171 172 int 173 sys_mmap(struct thread *td, struct mmap_args *uap) 174 { 175 176 return (kern_mmap(td, (uintptr_t)uap->addr, uap->len, uap->prot, 177 uap->flags, uap->fd, uap->pos)); 178 } 179 180 int 181 kern_mmap(struct thread *td, uintptr_t addr0, size_t size, int prot, int flags, 182 int fd, off_t pos) 183 { 184 struct vmspace *vms; 185 struct file *fp; 186 vm_offset_t addr; 187 vm_size_t pageoff; 188 vm_prot_t cap_maxprot; 189 int align, error; 190 cap_rights_t rights; 191 192 vms = td->td_proc->p_vmspace; 193 fp = NULL; 194 AUDIT_ARG_FD(fd); 195 addr = addr0; 196 197 /* 198 * Ignore old flags that used to be defined but did not do anything. 199 */ 200 flags &= ~(MAP_RESERVED0020 | MAP_RESERVED0040); 201 202 /* 203 * Enforce the constraints. 204 * Mapping of length 0 is only allowed for old binaries. 205 * Anonymous mapping shall specify -1 as filedescriptor and 206 * zero position for new code. Be nice to ancient a.out 207 * binaries and correct pos for anonymous mapping, since old 208 * ld.so sometimes issues anonymous map requests with non-zero 209 * pos. 210 */ 211 if (!SV_CURPROC_FLAG(SV_AOUT)) { 212 if ((size == 0 && curproc->p_osrel >= P_OSREL_MAP_ANON) || 213 ((flags & MAP_ANON) != 0 && (fd != -1 || pos != 0))) 214 return (EINVAL); 215 } else { 216 if ((flags & MAP_ANON) != 0) 217 pos = 0; 218 } 219 220 if (flags & MAP_STACK) { 221 if ((fd != -1) || 222 ((prot & (PROT_READ | PROT_WRITE)) != (PROT_READ | PROT_WRITE))) 223 return (EINVAL); 224 flags |= MAP_ANON; 225 pos = 0; 226 } 227 if ((flags & ~(MAP_SHARED | MAP_PRIVATE | MAP_FIXED | MAP_HASSEMAPHORE | 228 MAP_STACK | MAP_NOSYNC | MAP_ANON | MAP_EXCL | MAP_NOCORE | 229 MAP_PREFAULT_READ | 230 #ifdef MAP_32BIT 231 MAP_32BIT | 232 #endif 233 MAP_ALIGNMENT_MASK)) != 0) 234 return (EINVAL); 235 if ((flags & (MAP_EXCL | MAP_FIXED)) == MAP_EXCL) 236 return (EINVAL); 237 if ((flags & (MAP_SHARED | MAP_PRIVATE)) == (MAP_SHARED | MAP_PRIVATE)) 238 return (EINVAL); 239 if (prot != PROT_NONE && 240 (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) != 0) 241 return (EINVAL); 242 243 /* 244 * Align the file position to a page boundary, 245 * and save its page offset component. 246 */ 247 pageoff = (pos & PAGE_MASK); 248 pos -= pageoff; 249 250 /* Adjust size for rounding (on both ends). */ 251 size += pageoff; /* low end... */ 252 size = (vm_size_t) round_page(size); /* hi end */ 253 254 /* Ensure alignment is at least a page and fits in a pointer. */ 255 align = flags & MAP_ALIGNMENT_MASK; 256 if (align != 0 && align != MAP_ALIGNED_SUPER && 257 (align >> MAP_ALIGNMENT_SHIFT >= sizeof(void *) * NBBY || 258 align >> MAP_ALIGNMENT_SHIFT < PAGE_SHIFT)) 259 return (EINVAL); 260 261 /* 262 * Check for illegal addresses. Watch out for address wrap... Note 263 * that VM_*_ADDRESS are not constants due to casts (argh). 264 */ 265 if (flags & MAP_FIXED) { 266 /* 267 * The specified address must have the same remainder 268 * as the file offset taken modulo PAGE_SIZE, so it 269 * should be aligned after adjustment by pageoff. 270 */ 271 addr -= pageoff; 272 if (addr & PAGE_MASK) 273 return (EINVAL); 274 275 /* Address range must be all in user VM space. */ 276 if (addr < vm_map_min(&vms->vm_map) || 277 addr + size > vm_map_max(&vms->vm_map)) 278 return (EINVAL); 279 if (addr + size < addr) 280 return (EINVAL); 281 #ifdef MAP_32BIT 282 if (flags & MAP_32BIT && addr + size > MAP_32BIT_MAX_ADDR) 283 return (EINVAL); 284 } else if (flags & MAP_32BIT) { 285 /* 286 * For MAP_32BIT, override the hint if it is too high and 287 * do not bother moving the mapping past the heap (since 288 * the heap is usually above 2GB). 289 */ 290 if (addr + size > MAP_32BIT_MAX_ADDR) 291 addr = 0; 292 #endif 293 } else { 294 /* 295 * XXX for non-fixed mappings where no hint is provided or 296 * the hint would fall in the potential heap space, 297 * place it after the end of the largest possible heap. 298 * 299 * There should really be a pmap call to determine a reasonable 300 * location. 301 */ 302 if (addr == 0 || 303 (addr >= round_page((vm_offset_t)vms->vm_taddr) && 304 addr < round_page((vm_offset_t)vms->vm_daddr + 305 lim_max(td, RLIMIT_DATA)))) 306 addr = round_page((vm_offset_t)vms->vm_daddr + 307 lim_max(td, RLIMIT_DATA)); 308 } 309 if (size == 0) { 310 /* 311 * Return success without mapping anything for old 312 * binaries that request a page-aligned mapping of 313 * length 0. For modern binaries, this function 314 * returns an error earlier. 315 */ 316 error = 0; 317 } else if (flags & MAP_ANON) { 318 /* 319 * Mapping blank space is trivial. 320 * 321 * This relies on VM_PROT_* matching PROT_*. 322 */ 323 error = vm_mmap_object(&vms->vm_map, &addr, size, prot, 324 VM_PROT_ALL, flags, NULL, pos, FALSE, td); 325 } else { 326 /* 327 * Mapping file, get fp for validation and don't let the 328 * descriptor disappear on us if we block. Check capability 329 * rights, but also return the maximum rights to be combined 330 * with maxprot later. 331 */ 332 cap_rights_init(&rights, CAP_MMAP); 333 if (prot & PROT_READ) 334 cap_rights_set(&rights, CAP_MMAP_R); 335 if ((flags & MAP_SHARED) != 0) { 336 if (prot & PROT_WRITE) 337 cap_rights_set(&rights, CAP_MMAP_W); 338 } 339 if (prot & PROT_EXEC) 340 cap_rights_set(&rights, CAP_MMAP_X); 341 error = fget_mmap(td, fd, &rights, &cap_maxprot, &fp); 342 if (error != 0) 343 goto done; 344 if ((flags & (MAP_SHARED | MAP_PRIVATE)) == 0 && 345 td->td_proc->p_osrel >= P_OSREL_MAP_FSTRICT) { 346 error = EINVAL; 347 goto done; 348 } 349 350 /* This relies on VM_PROT_* matching PROT_*. */ 351 error = fo_mmap(fp, &vms->vm_map, &addr, size, prot, 352 cap_maxprot, flags, pos, td); 353 } 354 355 if (error == 0) 356 td->td_retval[0] = (register_t) (addr + pageoff); 357 done: 358 if (fp) 359 fdrop(fp, td); 360 361 return (error); 362 } 363 364 #if defined(COMPAT_FREEBSD6) 365 int 366 freebsd6_mmap(struct thread *td, struct freebsd6_mmap_args *uap) 367 { 368 369 return (kern_mmap(td, (uintptr_t)uap->addr, uap->len, uap->prot, 370 uap->flags, uap->fd, uap->pos)); 371 } 372 #endif 373 374 #ifdef COMPAT_43 375 #ifndef _SYS_SYSPROTO_H_ 376 struct ommap_args { 377 caddr_t addr; 378 int len; 379 int prot; 380 int flags; 381 int fd; 382 long pos; 383 }; 384 #endif 385 int 386 ommap(struct thread *td, struct ommap_args *uap) 387 { 388 static const char cvtbsdprot[8] = { 389 0, 390 PROT_EXEC, 391 PROT_WRITE, 392 PROT_EXEC | PROT_WRITE, 393 PROT_READ, 394 PROT_EXEC | PROT_READ, 395 PROT_WRITE | PROT_READ, 396 PROT_EXEC | PROT_WRITE | PROT_READ, 397 }; 398 int flags, prot; 399 400 #define OMAP_ANON 0x0002 401 #define OMAP_COPY 0x0020 402 #define OMAP_SHARED 0x0010 403 #define OMAP_FIXED 0x0100 404 405 prot = cvtbsdprot[uap->prot & 0x7]; 406 #ifdef COMPAT_FREEBSD32 407 #if defined(__amd64__) 408 if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32) && 409 prot != 0) 410 prot |= PROT_EXEC; 411 #endif 412 #endif 413 flags = 0; 414 if (uap->flags & OMAP_ANON) 415 flags |= MAP_ANON; 416 if (uap->flags & OMAP_COPY) 417 flags |= MAP_COPY; 418 if (uap->flags & OMAP_SHARED) 419 flags |= MAP_SHARED; 420 else 421 flags |= MAP_PRIVATE; 422 if (uap->flags & OMAP_FIXED) 423 flags |= MAP_FIXED; 424 return (kern_mmap(td, (uintptr_t)uap->addr, uap->len, prot, flags, 425 uap->fd, uap->pos)); 426 } 427 #endif /* COMPAT_43 */ 428 429 430 #ifndef _SYS_SYSPROTO_H_ 431 struct msync_args { 432 void *addr; 433 size_t len; 434 int flags; 435 }; 436 #endif 437 int 438 sys_msync(struct thread *td, struct msync_args *uap) 439 { 440 441 return (kern_msync(td, (uintptr_t)uap->addr, uap->len, uap->flags)); 442 } 443 444 int 445 kern_msync(struct thread *td, uintptr_t addr0, size_t size, int flags) 446 { 447 vm_offset_t addr; 448 vm_size_t pageoff; 449 vm_map_t map; 450 int rv; 451 452 addr = addr0; 453 pageoff = (addr & PAGE_MASK); 454 addr -= pageoff; 455 size += pageoff; 456 size = (vm_size_t) round_page(size); 457 if (addr + size < addr) 458 return (EINVAL); 459 460 if ((flags & (MS_ASYNC|MS_INVALIDATE)) == (MS_ASYNC|MS_INVALIDATE)) 461 return (EINVAL); 462 463 map = &td->td_proc->p_vmspace->vm_map; 464 465 /* 466 * Clean the pages and interpret the return value. 467 */ 468 rv = vm_map_sync(map, addr, addr + size, (flags & MS_ASYNC) == 0, 469 (flags & MS_INVALIDATE) != 0); 470 switch (rv) { 471 case KERN_SUCCESS: 472 return (0); 473 case KERN_INVALID_ADDRESS: 474 return (ENOMEM); 475 case KERN_INVALID_ARGUMENT: 476 return (EBUSY); 477 case KERN_FAILURE: 478 return (EIO); 479 default: 480 return (EINVAL); 481 } 482 } 483 484 #ifndef _SYS_SYSPROTO_H_ 485 struct munmap_args { 486 void *addr; 487 size_t len; 488 }; 489 #endif 490 int 491 sys_munmap(struct thread *td, struct munmap_args *uap) 492 { 493 494 return (kern_munmap(td, (uintptr_t)uap->addr, uap->len)); 495 } 496 497 int 498 kern_munmap(struct thread *td, uintptr_t addr0, size_t size) 499 { 500 #ifdef HWPMC_HOOKS 501 struct pmckern_map_out pkm; 502 vm_map_entry_t entry; 503 bool pmc_handled; 504 #endif 505 vm_offset_t addr; 506 vm_size_t pageoff; 507 vm_map_t map; 508 509 if (size == 0) 510 return (EINVAL); 511 512 addr = addr0; 513 pageoff = (addr & PAGE_MASK); 514 addr -= pageoff; 515 size += pageoff; 516 size = (vm_size_t) round_page(size); 517 if (addr + size < addr) 518 return (EINVAL); 519 520 /* 521 * Check for illegal addresses. Watch out for address wrap... 522 */ 523 map = &td->td_proc->p_vmspace->vm_map; 524 if (addr < vm_map_min(map) || addr + size > vm_map_max(map)) 525 return (EINVAL); 526 vm_map_lock(map); 527 #ifdef HWPMC_HOOKS 528 pmc_handled = false; 529 if (PMC_HOOK_INSTALLED(PMC_FN_MUNMAP)) { 530 pmc_handled = true; 531 /* 532 * Inform hwpmc if the address range being unmapped contains 533 * an executable region. 534 */ 535 pkm.pm_address = (uintptr_t) NULL; 536 if (vm_map_lookup_entry(map, addr, &entry)) { 537 for (; 538 entry != &map->header && entry->start < addr + size; 539 entry = entry->next) { 540 if (vm_map_check_protection(map, entry->start, 541 entry->end, VM_PROT_EXECUTE) == TRUE) { 542 pkm.pm_address = (uintptr_t) addr; 543 pkm.pm_size = (size_t) size; 544 break; 545 } 546 } 547 } 548 } 549 #endif 550 vm_map_delete(map, addr, addr + size); 551 552 #ifdef HWPMC_HOOKS 553 if (__predict_false(pmc_handled)) { 554 /* downgrade the lock to prevent a LOR with the pmc-sx lock */ 555 vm_map_lock_downgrade(map); 556 if (pkm.pm_address != (uintptr_t) NULL) 557 PMC_CALL_HOOK(td, PMC_FN_MUNMAP, (void *) &pkm); 558 vm_map_unlock_read(map); 559 } else 560 #endif 561 vm_map_unlock(map); 562 563 /* vm_map_delete returns nothing but KERN_SUCCESS anyway */ 564 return (0); 565 } 566 567 #ifndef _SYS_SYSPROTO_H_ 568 struct mprotect_args { 569 const void *addr; 570 size_t len; 571 int prot; 572 }; 573 #endif 574 int 575 sys_mprotect(struct thread *td, struct mprotect_args *uap) 576 { 577 578 return (kern_mprotect(td, (uintptr_t)uap->addr, uap->len, uap->prot)); 579 } 580 581 int 582 kern_mprotect(struct thread *td, uintptr_t addr0, size_t size, int prot) 583 { 584 vm_offset_t addr; 585 vm_size_t pageoff; 586 587 addr = addr0; 588 prot = (prot & VM_PROT_ALL); 589 pageoff = (addr & PAGE_MASK); 590 addr -= pageoff; 591 size += pageoff; 592 size = (vm_size_t) round_page(size); 593 if (addr + size < addr) 594 return (EINVAL); 595 596 switch (vm_map_protect(&td->td_proc->p_vmspace->vm_map, addr, 597 addr + size, prot, FALSE)) { 598 case KERN_SUCCESS: 599 return (0); 600 case KERN_PROTECTION_FAILURE: 601 return (EACCES); 602 case KERN_RESOURCE_SHORTAGE: 603 return (ENOMEM); 604 } 605 return (EINVAL); 606 } 607 608 #ifndef _SYS_SYSPROTO_H_ 609 struct minherit_args { 610 void *addr; 611 size_t len; 612 int inherit; 613 }; 614 #endif 615 int 616 sys_minherit(struct thread *td, struct minherit_args *uap) 617 { 618 vm_offset_t addr; 619 vm_size_t size, pageoff; 620 vm_inherit_t inherit; 621 622 addr = (vm_offset_t)uap->addr; 623 size = uap->len; 624 inherit = uap->inherit; 625 626 pageoff = (addr & PAGE_MASK); 627 addr -= pageoff; 628 size += pageoff; 629 size = (vm_size_t) round_page(size); 630 if (addr + size < addr) 631 return (EINVAL); 632 633 switch (vm_map_inherit(&td->td_proc->p_vmspace->vm_map, addr, 634 addr + size, inherit)) { 635 case KERN_SUCCESS: 636 return (0); 637 case KERN_PROTECTION_FAILURE: 638 return (EACCES); 639 } 640 return (EINVAL); 641 } 642 643 #ifndef _SYS_SYSPROTO_H_ 644 struct madvise_args { 645 void *addr; 646 size_t len; 647 int behav; 648 }; 649 #endif 650 651 int 652 sys_madvise(struct thread *td, struct madvise_args *uap) 653 { 654 655 return (kern_madvise(td, (uintptr_t)uap->addr, uap->len, uap->behav)); 656 } 657 658 int 659 kern_madvise(struct thread *td, uintptr_t addr0, size_t len, int behav) 660 { 661 vm_map_t map; 662 vm_offset_t addr, end, start; 663 int flags; 664 665 /* 666 * Check for our special case, advising the swap pager we are 667 * "immortal." 668 */ 669 if (behav == MADV_PROTECT) { 670 flags = PPROT_SET; 671 return (kern_procctl(td, P_PID, td->td_proc->p_pid, 672 PROC_SPROTECT, &flags)); 673 } 674 675 /* 676 * Check for illegal behavior 677 */ 678 if (behav < 0 || behav > MADV_CORE) 679 return (EINVAL); 680 /* 681 * Check for illegal addresses. Watch out for address wrap... Note 682 * that VM_*_ADDRESS are not constants due to casts (argh). 683 */ 684 map = &td->td_proc->p_vmspace->vm_map; 685 addr = addr0; 686 if (addr < vm_map_min(map) || addr + len > vm_map_max(map)) 687 return (EINVAL); 688 if ((addr + len) < addr) 689 return (EINVAL); 690 691 /* 692 * Since this routine is only advisory, we default to conservative 693 * behavior. 694 */ 695 start = trunc_page(addr); 696 end = round_page(addr + len); 697 698 if (vm_map_madvise(map, start, end, behav)) 699 return (EINVAL); 700 return (0); 701 } 702 703 #ifndef _SYS_SYSPROTO_H_ 704 struct mincore_args { 705 const void *addr; 706 size_t len; 707 char *vec; 708 }; 709 #endif 710 711 int 712 sys_mincore(struct thread *td, struct mincore_args *uap) 713 { 714 vm_offset_t addr, first_addr; 715 vm_offset_t end, cend; 716 pmap_t pmap; 717 vm_map_t map; 718 char *vec; 719 int error = 0; 720 int vecindex, lastvecindex; 721 vm_map_entry_t current; 722 vm_map_entry_t entry; 723 vm_object_t object; 724 vm_paddr_t locked_pa; 725 vm_page_t m; 726 vm_pindex_t pindex; 727 int mincoreinfo; 728 unsigned int timestamp; 729 boolean_t locked; 730 731 /* 732 * Make sure that the addresses presented are valid for user 733 * mode. 734 */ 735 first_addr = addr = trunc_page((vm_offset_t) uap->addr); 736 end = addr + (vm_size_t)round_page(uap->len); 737 map = &td->td_proc->p_vmspace->vm_map; 738 if (end > vm_map_max(map) || end < addr) 739 return (ENOMEM); 740 741 /* 742 * Address of byte vector 743 */ 744 vec = uap->vec; 745 746 pmap = vmspace_pmap(td->td_proc->p_vmspace); 747 748 vm_map_lock_read(map); 749 RestartScan: 750 timestamp = map->timestamp; 751 752 if (!vm_map_lookup_entry(map, addr, &entry)) { 753 vm_map_unlock_read(map); 754 return (ENOMEM); 755 } 756 757 /* 758 * Do this on a map entry basis so that if the pages are not 759 * in the current processes address space, we can easily look 760 * up the pages elsewhere. 761 */ 762 lastvecindex = -1; 763 for (current = entry; 764 (current != &map->header) && (current->start < end); 765 current = current->next) { 766 767 /* 768 * check for contiguity 769 */ 770 if (current->end < end && 771 (entry->next == &map->header || 772 current->next->start > current->end)) { 773 vm_map_unlock_read(map); 774 return (ENOMEM); 775 } 776 777 /* 778 * ignore submaps (for now) or null objects 779 */ 780 if ((current->eflags & MAP_ENTRY_IS_SUB_MAP) || 781 current->object.vm_object == NULL) 782 continue; 783 784 /* 785 * limit this scan to the current map entry and the 786 * limits for the mincore call 787 */ 788 if (addr < current->start) 789 addr = current->start; 790 cend = current->end; 791 if (cend > end) 792 cend = end; 793 794 /* 795 * scan this entry one page at a time 796 */ 797 while (addr < cend) { 798 /* 799 * Check pmap first, it is likely faster, also 800 * it can provide info as to whether we are the 801 * one referencing or modifying the page. 802 */ 803 object = NULL; 804 locked_pa = 0; 805 retry: 806 m = NULL; 807 mincoreinfo = pmap_mincore(pmap, addr, &locked_pa); 808 if (locked_pa != 0) { 809 /* 810 * The page is mapped by this process but not 811 * both accessed and modified. It is also 812 * managed. Acquire the object lock so that 813 * other mappings might be examined. 814 */ 815 m = PHYS_TO_VM_PAGE(locked_pa); 816 if (m->object != object) { 817 if (object != NULL) 818 VM_OBJECT_WUNLOCK(object); 819 object = m->object; 820 locked = VM_OBJECT_TRYWLOCK(object); 821 vm_page_unlock(m); 822 if (!locked) { 823 VM_OBJECT_WLOCK(object); 824 vm_page_lock(m); 825 goto retry; 826 } 827 } else 828 vm_page_unlock(m); 829 KASSERT(m->valid == VM_PAGE_BITS_ALL, 830 ("mincore: page %p is mapped but invalid", 831 m)); 832 } else if (mincoreinfo == 0) { 833 /* 834 * The page is not mapped by this process. If 835 * the object implements managed pages, then 836 * determine if the page is resident so that 837 * the mappings might be examined. 838 */ 839 if (current->object.vm_object != object) { 840 if (object != NULL) 841 VM_OBJECT_WUNLOCK(object); 842 object = current->object.vm_object; 843 VM_OBJECT_WLOCK(object); 844 } 845 if (object->type == OBJT_DEFAULT || 846 object->type == OBJT_SWAP || 847 object->type == OBJT_VNODE) { 848 pindex = OFF_TO_IDX(current->offset + 849 (addr - current->start)); 850 m = vm_page_lookup(object, pindex); 851 if (m != NULL && m->valid == 0) 852 m = NULL; 853 if (m != NULL) 854 mincoreinfo = MINCORE_INCORE; 855 } 856 } 857 if (m != NULL) { 858 /* Examine other mappings to the page. */ 859 if (m->dirty == 0 && pmap_is_modified(m)) 860 vm_page_dirty(m); 861 if (m->dirty != 0) 862 mincoreinfo |= MINCORE_MODIFIED_OTHER; 863 /* 864 * The first test for PGA_REFERENCED is an 865 * optimization. The second test is 866 * required because a concurrent pmap 867 * operation could clear the last reference 868 * and set PGA_REFERENCED before the call to 869 * pmap_is_referenced(). 870 */ 871 if ((m->aflags & PGA_REFERENCED) != 0 || 872 pmap_is_referenced(m) || 873 (m->aflags & PGA_REFERENCED) != 0) 874 mincoreinfo |= MINCORE_REFERENCED_OTHER; 875 } 876 if (object != NULL) 877 VM_OBJECT_WUNLOCK(object); 878 879 /* 880 * subyte may page fault. In case it needs to modify 881 * the map, we release the lock. 882 */ 883 vm_map_unlock_read(map); 884 885 /* 886 * calculate index into user supplied byte vector 887 */ 888 vecindex = OFF_TO_IDX(addr - first_addr); 889 890 /* 891 * If we have skipped map entries, we need to make sure that 892 * the byte vector is zeroed for those skipped entries. 893 */ 894 while ((lastvecindex + 1) < vecindex) { 895 ++lastvecindex; 896 error = subyte(vec + lastvecindex, 0); 897 if (error) { 898 error = EFAULT; 899 goto done2; 900 } 901 } 902 903 /* 904 * Pass the page information to the user 905 */ 906 error = subyte(vec + vecindex, mincoreinfo); 907 if (error) { 908 error = EFAULT; 909 goto done2; 910 } 911 912 /* 913 * If the map has changed, due to the subyte, the previous 914 * output may be invalid. 915 */ 916 vm_map_lock_read(map); 917 if (timestamp != map->timestamp) 918 goto RestartScan; 919 920 lastvecindex = vecindex; 921 addr += PAGE_SIZE; 922 } 923 } 924 925 /* 926 * subyte may page fault. In case it needs to modify 927 * the map, we release the lock. 928 */ 929 vm_map_unlock_read(map); 930 931 /* 932 * Zero the last entries in the byte vector. 933 */ 934 vecindex = OFF_TO_IDX(end - first_addr); 935 while ((lastvecindex + 1) < vecindex) { 936 ++lastvecindex; 937 error = subyte(vec + lastvecindex, 0); 938 if (error) { 939 error = EFAULT; 940 goto done2; 941 } 942 } 943 944 /* 945 * If the map has changed, due to the subyte, the previous 946 * output may be invalid. 947 */ 948 vm_map_lock_read(map); 949 if (timestamp != map->timestamp) 950 goto RestartScan; 951 vm_map_unlock_read(map); 952 done2: 953 return (error); 954 } 955 956 #ifndef _SYS_SYSPROTO_H_ 957 struct mlock_args { 958 const void *addr; 959 size_t len; 960 }; 961 #endif 962 int 963 sys_mlock(struct thread *td, struct mlock_args *uap) 964 { 965 966 return (kern_mlock(td->td_proc, td->td_ucred, 967 __DECONST(uintptr_t, uap->addr), uap->len)); 968 } 969 970 int 971 kern_mlock(struct proc *proc, struct ucred *cred, uintptr_t addr0, size_t len) 972 { 973 vm_offset_t addr, end, last, start; 974 vm_size_t npages, size; 975 vm_map_t map; 976 unsigned long nsize; 977 int error; 978 979 error = priv_check_cred(cred, PRIV_VM_MLOCK, 0); 980 if (error) 981 return (error); 982 addr = addr0; 983 size = len; 984 last = addr + size; 985 start = trunc_page(addr); 986 end = round_page(last); 987 if (last < addr || end < addr) 988 return (EINVAL); 989 npages = atop(end - start); 990 if (npages > vm_page_max_wired) 991 return (ENOMEM); 992 map = &proc->p_vmspace->vm_map; 993 PROC_LOCK(proc); 994 nsize = ptoa(npages + pmap_wired_count(map->pmap)); 995 if (nsize > lim_cur_proc(proc, RLIMIT_MEMLOCK)) { 996 PROC_UNLOCK(proc); 997 return (ENOMEM); 998 } 999 PROC_UNLOCK(proc); 1000 if (npages + vm_cnt.v_wire_count > vm_page_max_wired) 1001 return (EAGAIN); 1002 #ifdef RACCT 1003 if (racct_enable) { 1004 PROC_LOCK(proc); 1005 error = racct_set(proc, RACCT_MEMLOCK, nsize); 1006 PROC_UNLOCK(proc); 1007 if (error != 0) 1008 return (ENOMEM); 1009 } 1010 #endif 1011 error = vm_map_wire(map, start, end, 1012 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES); 1013 #ifdef RACCT 1014 if (racct_enable && error != KERN_SUCCESS) { 1015 PROC_LOCK(proc); 1016 racct_set(proc, RACCT_MEMLOCK, 1017 ptoa(pmap_wired_count(map->pmap))); 1018 PROC_UNLOCK(proc); 1019 } 1020 #endif 1021 return (error == KERN_SUCCESS ? 0 : ENOMEM); 1022 } 1023 1024 #ifndef _SYS_SYSPROTO_H_ 1025 struct mlockall_args { 1026 int how; 1027 }; 1028 #endif 1029 1030 int 1031 sys_mlockall(struct thread *td, struct mlockall_args *uap) 1032 { 1033 vm_map_t map; 1034 int error; 1035 1036 map = &td->td_proc->p_vmspace->vm_map; 1037 error = priv_check(td, PRIV_VM_MLOCK); 1038 if (error) 1039 return (error); 1040 1041 if ((uap->how == 0) || ((uap->how & ~(MCL_CURRENT|MCL_FUTURE)) != 0)) 1042 return (EINVAL); 1043 1044 /* 1045 * If wiring all pages in the process would cause it to exceed 1046 * a hard resource limit, return ENOMEM. 1047 */ 1048 if (!old_mlock && uap->how & MCL_CURRENT) { 1049 PROC_LOCK(td->td_proc); 1050 if (map->size > lim_cur(td, RLIMIT_MEMLOCK)) { 1051 PROC_UNLOCK(td->td_proc); 1052 return (ENOMEM); 1053 } 1054 PROC_UNLOCK(td->td_proc); 1055 } 1056 #ifdef RACCT 1057 if (racct_enable) { 1058 PROC_LOCK(td->td_proc); 1059 error = racct_set(td->td_proc, RACCT_MEMLOCK, map->size); 1060 PROC_UNLOCK(td->td_proc); 1061 if (error != 0) 1062 return (ENOMEM); 1063 } 1064 #endif 1065 1066 if (uap->how & MCL_FUTURE) { 1067 vm_map_lock(map); 1068 vm_map_modflags(map, MAP_WIREFUTURE, 0); 1069 vm_map_unlock(map); 1070 error = 0; 1071 } 1072 1073 if (uap->how & MCL_CURRENT) { 1074 /* 1075 * P1003.1-2001 mandates that all currently mapped pages 1076 * will be memory resident and locked (wired) upon return 1077 * from mlockall(). vm_map_wire() will wire pages, by 1078 * calling vm_fault_wire() for each page in the region. 1079 */ 1080 error = vm_map_wire(map, vm_map_min(map), vm_map_max(map), 1081 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK); 1082 error = (error == KERN_SUCCESS ? 0 : EAGAIN); 1083 } 1084 #ifdef RACCT 1085 if (racct_enable && error != KERN_SUCCESS) { 1086 PROC_LOCK(td->td_proc); 1087 racct_set(td->td_proc, RACCT_MEMLOCK, 1088 ptoa(pmap_wired_count(map->pmap))); 1089 PROC_UNLOCK(td->td_proc); 1090 } 1091 #endif 1092 1093 return (error); 1094 } 1095 1096 #ifndef _SYS_SYSPROTO_H_ 1097 struct munlockall_args { 1098 register_t dummy; 1099 }; 1100 #endif 1101 1102 int 1103 sys_munlockall(struct thread *td, struct munlockall_args *uap) 1104 { 1105 vm_map_t map; 1106 int error; 1107 1108 map = &td->td_proc->p_vmspace->vm_map; 1109 error = priv_check(td, PRIV_VM_MUNLOCK); 1110 if (error) 1111 return (error); 1112 1113 /* Clear the MAP_WIREFUTURE flag from this vm_map. */ 1114 vm_map_lock(map); 1115 vm_map_modflags(map, 0, MAP_WIREFUTURE); 1116 vm_map_unlock(map); 1117 1118 /* Forcibly unwire all pages. */ 1119 error = vm_map_unwire(map, vm_map_min(map), vm_map_max(map), 1120 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK); 1121 #ifdef RACCT 1122 if (racct_enable && error == KERN_SUCCESS) { 1123 PROC_LOCK(td->td_proc); 1124 racct_set(td->td_proc, RACCT_MEMLOCK, 0); 1125 PROC_UNLOCK(td->td_proc); 1126 } 1127 #endif 1128 1129 return (error); 1130 } 1131 1132 #ifndef _SYS_SYSPROTO_H_ 1133 struct munlock_args { 1134 const void *addr; 1135 size_t len; 1136 }; 1137 #endif 1138 int 1139 sys_munlock(struct thread *td, struct munlock_args *uap) 1140 { 1141 1142 return (kern_munlock(td, (uintptr_t)uap->addr, uap->len)); 1143 } 1144 1145 int 1146 kern_munlock(struct thread *td, uintptr_t addr0, size_t size) 1147 { 1148 vm_offset_t addr, end, last, start; 1149 #ifdef RACCT 1150 vm_map_t map; 1151 #endif 1152 int error; 1153 1154 error = priv_check(td, PRIV_VM_MUNLOCK); 1155 if (error) 1156 return (error); 1157 addr = addr0; 1158 last = addr + size; 1159 start = trunc_page(addr); 1160 end = round_page(last); 1161 if (last < addr || end < addr) 1162 return (EINVAL); 1163 error = vm_map_unwire(&td->td_proc->p_vmspace->vm_map, start, end, 1164 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES); 1165 #ifdef RACCT 1166 if (racct_enable && error == KERN_SUCCESS) { 1167 PROC_LOCK(td->td_proc); 1168 map = &td->td_proc->p_vmspace->vm_map; 1169 racct_set(td->td_proc, RACCT_MEMLOCK, 1170 ptoa(pmap_wired_count(map->pmap))); 1171 PROC_UNLOCK(td->td_proc); 1172 } 1173 #endif 1174 return (error == KERN_SUCCESS ? 0 : ENOMEM); 1175 } 1176 1177 /* 1178 * vm_mmap_vnode() 1179 * 1180 * Helper function for vm_mmap. Perform sanity check specific for mmap 1181 * operations on vnodes. 1182 */ 1183 int 1184 vm_mmap_vnode(struct thread *td, vm_size_t objsize, 1185 vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp, 1186 struct vnode *vp, vm_ooffset_t *foffp, vm_object_t *objp, 1187 boolean_t *writecounted) 1188 { 1189 struct vattr va; 1190 vm_object_t obj; 1191 vm_offset_t foff; 1192 struct ucred *cred; 1193 int error, flags, locktype; 1194 1195 cred = td->td_ucred; 1196 if ((*maxprotp & VM_PROT_WRITE) && (*flagsp & MAP_SHARED)) 1197 locktype = LK_EXCLUSIVE; 1198 else 1199 locktype = LK_SHARED; 1200 if ((error = vget(vp, locktype, td)) != 0) 1201 return (error); 1202 AUDIT_ARG_VNODE1(vp); 1203 foff = *foffp; 1204 flags = *flagsp; 1205 obj = vp->v_object; 1206 if (vp->v_type == VREG) { 1207 /* 1208 * Get the proper underlying object 1209 */ 1210 if (obj == NULL) { 1211 error = EINVAL; 1212 goto done; 1213 } 1214 if (obj->type == OBJT_VNODE && obj->handle != vp) { 1215 vput(vp); 1216 vp = (struct vnode *)obj->handle; 1217 /* 1218 * Bypass filesystems obey the mpsafety of the 1219 * underlying fs. Tmpfs never bypasses. 1220 */ 1221 error = vget(vp, locktype, td); 1222 if (error != 0) 1223 return (error); 1224 } 1225 if (locktype == LK_EXCLUSIVE) { 1226 *writecounted = TRUE; 1227 vnode_pager_update_writecount(obj, 0, objsize); 1228 } 1229 } else { 1230 error = EINVAL; 1231 goto done; 1232 } 1233 if ((error = VOP_GETATTR(vp, &va, cred))) 1234 goto done; 1235 #ifdef MAC 1236 /* This relies on VM_PROT_* matching PROT_*. */ 1237 error = mac_vnode_check_mmap(cred, vp, (int)prot, flags); 1238 if (error != 0) 1239 goto done; 1240 #endif 1241 if ((flags & MAP_SHARED) != 0) { 1242 if ((va.va_flags & (SF_SNAPSHOT|IMMUTABLE|APPEND)) != 0) { 1243 if (prot & VM_PROT_WRITE) { 1244 error = EPERM; 1245 goto done; 1246 } 1247 *maxprotp &= ~VM_PROT_WRITE; 1248 } 1249 } 1250 /* 1251 * If it is a regular file without any references 1252 * we do not need to sync it. 1253 * Adjust object size to be the size of actual file. 1254 */ 1255 objsize = round_page(va.va_size); 1256 if (va.va_nlink == 0) 1257 flags |= MAP_NOSYNC; 1258 if (obj->type == OBJT_VNODE) { 1259 obj = vm_pager_allocate(OBJT_VNODE, vp, objsize, prot, foff, 1260 cred); 1261 if (obj == NULL) { 1262 error = ENOMEM; 1263 goto done; 1264 } 1265 } else { 1266 KASSERT(obj->type == OBJT_DEFAULT || obj->type == OBJT_SWAP, 1267 ("wrong object type")); 1268 VM_OBJECT_WLOCK(obj); 1269 vm_object_reference_locked(obj); 1270 #if VM_NRESERVLEVEL > 0 1271 vm_object_color(obj, 0); 1272 #endif 1273 VM_OBJECT_WUNLOCK(obj); 1274 } 1275 *objp = obj; 1276 *flagsp = flags; 1277 1278 vfs_mark_atime(vp, cred); 1279 1280 done: 1281 if (error != 0 && *writecounted) { 1282 *writecounted = FALSE; 1283 vnode_pager_update_writecount(obj, objsize, 0); 1284 } 1285 vput(vp); 1286 return (error); 1287 } 1288 1289 /* 1290 * vm_mmap_cdev() 1291 * 1292 * Helper function for vm_mmap. Perform sanity check specific for mmap 1293 * operations on cdevs. 1294 */ 1295 int 1296 vm_mmap_cdev(struct thread *td, vm_size_t objsize, vm_prot_t prot, 1297 vm_prot_t *maxprotp, int *flagsp, struct cdev *cdev, struct cdevsw *dsw, 1298 vm_ooffset_t *foff, vm_object_t *objp) 1299 { 1300 vm_object_t obj; 1301 int error, flags; 1302 1303 flags = *flagsp; 1304 1305 if (dsw->d_flags & D_MMAP_ANON) { 1306 *objp = NULL; 1307 *foff = 0; 1308 *maxprotp = VM_PROT_ALL; 1309 *flagsp |= MAP_ANON; 1310 return (0); 1311 } 1312 /* 1313 * cdevs do not provide private mappings of any kind. 1314 */ 1315 if ((*maxprotp & VM_PROT_WRITE) == 0 && 1316 (prot & VM_PROT_WRITE) != 0) 1317 return (EACCES); 1318 if (flags & (MAP_PRIVATE|MAP_COPY)) 1319 return (EINVAL); 1320 /* 1321 * Force device mappings to be shared. 1322 */ 1323 flags |= MAP_SHARED; 1324 #ifdef MAC_XXX 1325 error = mac_cdev_check_mmap(td->td_ucred, cdev, (int)prot); 1326 if (error != 0) 1327 return (error); 1328 #endif 1329 /* 1330 * First, try d_mmap_single(). If that is not implemented 1331 * (returns ENODEV), fall back to using the device pager. 1332 * Note that d_mmap_single() must return a reference to the 1333 * object (it needs to bump the reference count of the object 1334 * it returns somehow). 1335 * 1336 * XXX assumes VM_PROT_* == PROT_* 1337 */ 1338 error = dsw->d_mmap_single(cdev, foff, objsize, objp, (int)prot); 1339 if (error != ENODEV) 1340 return (error); 1341 obj = vm_pager_allocate(OBJT_DEVICE, cdev, objsize, prot, *foff, 1342 td->td_ucred); 1343 if (obj == NULL) 1344 return (EINVAL); 1345 *objp = obj; 1346 *flagsp = flags; 1347 return (0); 1348 } 1349 1350 /* 1351 * vm_mmap() 1352 * 1353 * Internal version of mmap used by exec, sys5 shared memory, and 1354 * various device drivers. Handle is either a vnode pointer, a 1355 * character device, or NULL for MAP_ANON. 1356 */ 1357 int 1358 vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot, 1359 vm_prot_t maxprot, int flags, 1360 objtype_t handle_type, void *handle, 1361 vm_ooffset_t foff) 1362 { 1363 vm_object_t object; 1364 struct thread *td = curthread; 1365 int error; 1366 boolean_t writecounted; 1367 1368 if (size == 0) 1369 return (EINVAL); 1370 1371 size = round_page(size); 1372 object = NULL; 1373 writecounted = FALSE; 1374 1375 /* 1376 * Lookup/allocate object. 1377 */ 1378 switch (handle_type) { 1379 case OBJT_DEVICE: { 1380 struct cdevsw *dsw; 1381 struct cdev *cdev; 1382 int ref; 1383 1384 cdev = handle; 1385 dsw = dev_refthread(cdev, &ref); 1386 if (dsw == NULL) 1387 return (ENXIO); 1388 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, cdev, 1389 dsw, &foff, &object); 1390 dev_relthread(cdev, ref); 1391 break; 1392 } 1393 case OBJT_VNODE: 1394 error = vm_mmap_vnode(td, size, prot, &maxprot, &flags, 1395 handle, &foff, &object, &writecounted); 1396 break; 1397 case OBJT_DEFAULT: 1398 if (handle == NULL) { 1399 error = 0; 1400 break; 1401 } 1402 /* FALLTHROUGH */ 1403 default: 1404 error = EINVAL; 1405 break; 1406 } 1407 if (error) 1408 return (error); 1409 1410 error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object, 1411 foff, writecounted, td); 1412 if (error != 0 && object != NULL) { 1413 /* 1414 * If this mapping was accounted for in the vnode's 1415 * writecount, then undo that now. 1416 */ 1417 if (writecounted) 1418 vnode_pager_release_writecount(object, 0, size); 1419 vm_object_deallocate(object); 1420 } 1421 return (error); 1422 } 1423 1424 /* 1425 * Internal version of mmap that maps a specific VM object into an 1426 * map. Called by mmap for MAP_ANON, vm_mmap, shm_mmap, and vn_mmap. 1427 */ 1428 int 1429 vm_mmap_object(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot, 1430 vm_prot_t maxprot, int flags, vm_object_t object, vm_ooffset_t foff, 1431 boolean_t writecounted, struct thread *td) 1432 { 1433 boolean_t fitit; 1434 int docow, error, findspace, rv; 1435 1436 if (map == &td->td_proc->p_vmspace->vm_map) { 1437 PROC_LOCK(td->td_proc); 1438 if (map->size + size > lim_cur_proc(td->td_proc, RLIMIT_VMEM)) { 1439 PROC_UNLOCK(td->td_proc); 1440 return (ENOMEM); 1441 } 1442 if (racct_set(td->td_proc, RACCT_VMEM, map->size + size)) { 1443 PROC_UNLOCK(td->td_proc); 1444 return (ENOMEM); 1445 } 1446 if (!old_mlock && map->flags & MAP_WIREFUTURE) { 1447 if (ptoa(pmap_wired_count(map->pmap)) + size > 1448 lim_cur_proc(td->td_proc, RLIMIT_MEMLOCK)) { 1449 racct_set_force(td->td_proc, RACCT_VMEM, 1450 map->size); 1451 PROC_UNLOCK(td->td_proc); 1452 return (ENOMEM); 1453 } 1454 error = racct_set(td->td_proc, RACCT_MEMLOCK, 1455 ptoa(pmap_wired_count(map->pmap)) + size); 1456 if (error != 0) { 1457 racct_set_force(td->td_proc, RACCT_VMEM, 1458 map->size); 1459 PROC_UNLOCK(td->td_proc); 1460 return (error); 1461 } 1462 } 1463 PROC_UNLOCK(td->td_proc); 1464 } 1465 1466 /* 1467 * We currently can only deal with page aligned file offsets. 1468 * The mmap() system call already enforces this by subtracting 1469 * the page offset from the file offset, but checking here 1470 * catches errors in device drivers (e.g. d_single_mmap() 1471 * callbacks) and other internal mapping requests (such as in 1472 * exec). 1473 */ 1474 if (foff & PAGE_MASK) 1475 return (EINVAL); 1476 1477 if ((flags & MAP_FIXED) == 0) { 1478 fitit = TRUE; 1479 *addr = round_page(*addr); 1480 } else { 1481 if (*addr != trunc_page(*addr)) 1482 return (EINVAL); 1483 fitit = FALSE; 1484 } 1485 1486 if (flags & MAP_ANON) { 1487 if (object != NULL || foff != 0) 1488 return (EINVAL); 1489 docow = 0; 1490 } else if (flags & MAP_PREFAULT_READ) 1491 docow = MAP_PREFAULT; 1492 else 1493 docow = MAP_PREFAULT_PARTIAL; 1494 1495 if ((flags & (MAP_ANON|MAP_SHARED)) == 0) 1496 docow |= MAP_COPY_ON_WRITE; 1497 if (flags & MAP_NOSYNC) 1498 docow |= MAP_DISABLE_SYNCER; 1499 if (flags & MAP_NOCORE) 1500 docow |= MAP_DISABLE_COREDUMP; 1501 /* Shared memory is also shared with children. */ 1502 if (flags & MAP_SHARED) 1503 docow |= MAP_INHERIT_SHARE; 1504 if (writecounted) 1505 docow |= MAP_VN_WRITECOUNT; 1506 if (flags & MAP_STACK) { 1507 if (object != NULL) 1508 return (EINVAL); 1509 docow |= MAP_STACK_GROWS_DOWN; 1510 } 1511 if ((flags & MAP_EXCL) != 0) 1512 docow |= MAP_CHECK_EXCL; 1513 1514 if (fitit) { 1515 if ((flags & MAP_ALIGNMENT_MASK) == MAP_ALIGNED_SUPER) 1516 findspace = VMFS_SUPER_SPACE; 1517 else if ((flags & MAP_ALIGNMENT_MASK) != 0) 1518 findspace = VMFS_ALIGNED_SPACE(flags >> 1519 MAP_ALIGNMENT_SHIFT); 1520 else 1521 findspace = VMFS_OPTIMAL_SPACE; 1522 rv = vm_map_find(map, object, foff, addr, size, 1523 #ifdef MAP_32BIT 1524 flags & MAP_32BIT ? MAP_32BIT_MAX_ADDR : 1525 #endif 1526 0, findspace, prot, maxprot, docow); 1527 } else { 1528 rv = vm_map_fixed(map, object, foff, *addr, size, 1529 prot, maxprot, docow); 1530 } 1531 1532 if (rv == KERN_SUCCESS) { 1533 /* 1534 * If the process has requested that all future mappings 1535 * be wired, then heed this. 1536 */ 1537 if (map->flags & MAP_WIREFUTURE) { 1538 vm_map_wire(map, *addr, *addr + size, 1539 VM_MAP_WIRE_USER | ((flags & MAP_STACK) ? 1540 VM_MAP_WIRE_HOLESOK : VM_MAP_WIRE_NOHOLES)); 1541 } 1542 } 1543 return (vm_mmap_to_errno(rv)); 1544 } 1545 1546 /* 1547 * Translate a Mach VM return code to zero on success or the appropriate errno 1548 * on failure. 1549 */ 1550 int 1551 vm_mmap_to_errno(int rv) 1552 { 1553 1554 switch (rv) { 1555 case KERN_SUCCESS: 1556 return (0); 1557 case KERN_INVALID_ADDRESS: 1558 case KERN_NO_SPACE: 1559 return (ENOMEM); 1560 case KERN_PROTECTION_FAILURE: 1561 return (EACCES); 1562 default: 1563 return (EINVAL); 1564 } 1565 } 1566