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 { 714 715 return (kern_mincore(td, (uintptr_t)uap->addr, uap->len, uap->vec)); 716 } 717 718 int 719 kern_mincore(struct thread *td, uintptr_t addr0, size_t len, char *vec) 720 { 721 vm_offset_t addr, first_addr; 722 vm_offset_t end, cend; 723 pmap_t pmap; 724 vm_map_t map; 725 int error = 0; 726 int vecindex, lastvecindex; 727 vm_map_entry_t current; 728 vm_map_entry_t entry; 729 vm_object_t object; 730 vm_paddr_t locked_pa; 731 vm_page_t m; 732 vm_pindex_t pindex; 733 int mincoreinfo; 734 unsigned int timestamp; 735 boolean_t locked; 736 737 /* 738 * Make sure that the addresses presented are valid for user 739 * mode. 740 */ 741 first_addr = addr = trunc_page(addr0); 742 end = addr + (vm_size_t)round_page(len); 743 map = &td->td_proc->p_vmspace->vm_map; 744 if (end > vm_map_max(map) || end < addr) 745 return (ENOMEM); 746 747 pmap = vmspace_pmap(td->td_proc->p_vmspace); 748 749 vm_map_lock_read(map); 750 RestartScan: 751 timestamp = map->timestamp; 752 753 if (!vm_map_lookup_entry(map, addr, &entry)) { 754 vm_map_unlock_read(map); 755 return (ENOMEM); 756 } 757 758 /* 759 * Do this on a map entry basis so that if the pages are not 760 * in the current processes address space, we can easily look 761 * up the pages elsewhere. 762 */ 763 lastvecindex = -1; 764 for (current = entry; 765 (current != &map->header) && (current->start < end); 766 current = current->next) { 767 768 /* 769 * check for contiguity 770 */ 771 if (current->end < end && 772 (entry->next == &map->header || 773 current->next->start > current->end)) { 774 vm_map_unlock_read(map); 775 return (ENOMEM); 776 } 777 778 /* 779 * ignore submaps (for now) or null objects 780 */ 781 if ((current->eflags & MAP_ENTRY_IS_SUB_MAP) || 782 current->object.vm_object == NULL) 783 continue; 784 785 /* 786 * limit this scan to the current map entry and the 787 * limits for the mincore call 788 */ 789 if (addr < current->start) 790 addr = current->start; 791 cend = current->end; 792 if (cend > end) 793 cend = end; 794 795 /* 796 * scan this entry one page at a time 797 */ 798 while (addr < cend) { 799 /* 800 * Check pmap first, it is likely faster, also 801 * it can provide info as to whether we are the 802 * one referencing or modifying the page. 803 */ 804 object = NULL; 805 locked_pa = 0; 806 retry: 807 m = NULL; 808 mincoreinfo = pmap_mincore(pmap, addr, &locked_pa); 809 if (locked_pa != 0) { 810 /* 811 * The page is mapped by this process but not 812 * both accessed and modified. It is also 813 * managed. Acquire the object lock so that 814 * other mappings might be examined. 815 */ 816 m = PHYS_TO_VM_PAGE(locked_pa); 817 if (m->object != object) { 818 if (object != NULL) 819 VM_OBJECT_WUNLOCK(object); 820 object = m->object; 821 locked = VM_OBJECT_TRYWLOCK(object); 822 vm_page_unlock(m); 823 if (!locked) { 824 VM_OBJECT_WLOCK(object); 825 vm_page_lock(m); 826 goto retry; 827 } 828 } else 829 vm_page_unlock(m); 830 KASSERT(m->valid == VM_PAGE_BITS_ALL, 831 ("mincore: page %p is mapped but invalid", 832 m)); 833 } else if (mincoreinfo == 0) { 834 /* 835 * The page is not mapped by this process. If 836 * the object implements managed pages, then 837 * determine if the page is resident so that 838 * the mappings might be examined. 839 */ 840 if (current->object.vm_object != object) { 841 if (object != NULL) 842 VM_OBJECT_WUNLOCK(object); 843 object = current->object.vm_object; 844 VM_OBJECT_WLOCK(object); 845 } 846 if (object->type == OBJT_DEFAULT || 847 object->type == OBJT_SWAP || 848 object->type == OBJT_VNODE) { 849 pindex = OFF_TO_IDX(current->offset + 850 (addr - current->start)); 851 m = vm_page_lookup(object, pindex); 852 if (m != NULL && m->valid == 0) 853 m = NULL; 854 if (m != NULL) 855 mincoreinfo = MINCORE_INCORE; 856 } 857 } 858 if (m != NULL) { 859 /* Examine other mappings to the page. */ 860 if (m->dirty == 0 && pmap_is_modified(m)) 861 vm_page_dirty(m); 862 if (m->dirty != 0) 863 mincoreinfo |= MINCORE_MODIFIED_OTHER; 864 /* 865 * The first test for PGA_REFERENCED is an 866 * optimization. The second test is 867 * required because a concurrent pmap 868 * operation could clear the last reference 869 * and set PGA_REFERENCED before the call to 870 * pmap_is_referenced(). 871 */ 872 if ((m->aflags & PGA_REFERENCED) != 0 || 873 pmap_is_referenced(m) || 874 (m->aflags & PGA_REFERENCED) != 0) 875 mincoreinfo |= MINCORE_REFERENCED_OTHER; 876 } 877 if (object != NULL) 878 VM_OBJECT_WUNLOCK(object); 879 880 /* 881 * subyte may page fault. In case it needs to modify 882 * the map, we release the lock. 883 */ 884 vm_map_unlock_read(map); 885 886 /* 887 * calculate index into user supplied byte vector 888 */ 889 vecindex = atop(addr - first_addr); 890 891 /* 892 * If we have skipped map entries, we need to make sure that 893 * the byte vector is zeroed for those skipped entries. 894 */ 895 while ((lastvecindex + 1) < vecindex) { 896 ++lastvecindex; 897 error = subyte(vec + lastvecindex, 0); 898 if (error) { 899 error = EFAULT; 900 goto done2; 901 } 902 } 903 904 /* 905 * Pass the page information to the user 906 */ 907 error = subyte(vec + vecindex, mincoreinfo); 908 if (error) { 909 error = EFAULT; 910 goto done2; 911 } 912 913 /* 914 * If the map has changed, due to the subyte, the previous 915 * output may be invalid. 916 */ 917 vm_map_lock_read(map); 918 if (timestamp != map->timestamp) 919 goto RestartScan; 920 921 lastvecindex = vecindex; 922 addr += PAGE_SIZE; 923 } 924 } 925 926 /* 927 * subyte may page fault. In case it needs to modify 928 * the map, we release the lock. 929 */ 930 vm_map_unlock_read(map); 931 932 /* 933 * Zero the last entries in the byte vector. 934 */ 935 vecindex = atop(end - first_addr); 936 while ((lastvecindex + 1) < vecindex) { 937 ++lastvecindex; 938 error = subyte(vec + lastvecindex, 0); 939 if (error) { 940 error = EFAULT; 941 goto done2; 942 } 943 } 944 945 /* 946 * If the map has changed, due to the subyte, the previous 947 * output may be invalid. 948 */ 949 vm_map_lock_read(map); 950 if (timestamp != map->timestamp) 951 goto RestartScan; 952 vm_map_unlock_read(map); 953 done2: 954 return (error); 955 } 956 957 #ifndef _SYS_SYSPROTO_H_ 958 struct mlock_args { 959 const void *addr; 960 size_t len; 961 }; 962 #endif 963 int 964 sys_mlock(struct thread *td, struct mlock_args *uap) 965 { 966 967 return (kern_mlock(td->td_proc, td->td_ucred, 968 __DECONST(uintptr_t, uap->addr), uap->len)); 969 } 970 971 int 972 kern_mlock(struct proc *proc, struct ucred *cred, uintptr_t addr0, size_t len) 973 { 974 vm_offset_t addr, end, last, start; 975 vm_size_t npages, size; 976 vm_map_t map; 977 unsigned long nsize; 978 int error; 979 980 error = priv_check_cred(cred, PRIV_VM_MLOCK, 0); 981 if (error) 982 return (error); 983 addr = addr0; 984 size = len; 985 last = addr + size; 986 start = trunc_page(addr); 987 end = round_page(last); 988 if (last < addr || end < addr) 989 return (EINVAL); 990 npages = atop(end - start); 991 if (npages > vm_page_max_wired) 992 return (ENOMEM); 993 map = &proc->p_vmspace->vm_map; 994 PROC_LOCK(proc); 995 nsize = ptoa(npages + pmap_wired_count(map->pmap)); 996 if (nsize > lim_cur_proc(proc, RLIMIT_MEMLOCK)) { 997 PROC_UNLOCK(proc); 998 return (ENOMEM); 999 } 1000 PROC_UNLOCK(proc); 1001 if (npages + vm_cnt.v_wire_count > vm_page_max_wired) 1002 return (EAGAIN); 1003 #ifdef RACCT 1004 if (racct_enable) { 1005 PROC_LOCK(proc); 1006 error = racct_set(proc, RACCT_MEMLOCK, nsize); 1007 PROC_UNLOCK(proc); 1008 if (error != 0) 1009 return (ENOMEM); 1010 } 1011 #endif 1012 error = vm_map_wire(map, start, end, 1013 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES); 1014 #ifdef RACCT 1015 if (racct_enable && error != KERN_SUCCESS) { 1016 PROC_LOCK(proc); 1017 racct_set(proc, RACCT_MEMLOCK, 1018 ptoa(pmap_wired_count(map->pmap))); 1019 PROC_UNLOCK(proc); 1020 } 1021 #endif 1022 return (error == KERN_SUCCESS ? 0 : ENOMEM); 1023 } 1024 1025 #ifndef _SYS_SYSPROTO_H_ 1026 struct mlockall_args { 1027 int how; 1028 }; 1029 #endif 1030 1031 int 1032 sys_mlockall(struct thread *td, struct mlockall_args *uap) 1033 { 1034 vm_map_t map; 1035 int error; 1036 1037 map = &td->td_proc->p_vmspace->vm_map; 1038 error = priv_check(td, PRIV_VM_MLOCK); 1039 if (error) 1040 return (error); 1041 1042 if ((uap->how == 0) || ((uap->how & ~(MCL_CURRENT|MCL_FUTURE)) != 0)) 1043 return (EINVAL); 1044 1045 /* 1046 * If wiring all pages in the process would cause it to exceed 1047 * a hard resource limit, return ENOMEM. 1048 */ 1049 if (!old_mlock && uap->how & MCL_CURRENT) { 1050 PROC_LOCK(td->td_proc); 1051 if (map->size > lim_cur(td, RLIMIT_MEMLOCK)) { 1052 PROC_UNLOCK(td->td_proc); 1053 return (ENOMEM); 1054 } 1055 PROC_UNLOCK(td->td_proc); 1056 } 1057 #ifdef RACCT 1058 if (racct_enable) { 1059 PROC_LOCK(td->td_proc); 1060 error = racct_set(td->td_proc, RACCT_MEMLOCK, map->size); 1061 PROC_UNLOCK(td->td_proc); 1062 if (error != 0) 1063 return (ENOMEM); 1064 } 1065 #endif 1066 1067 if (uap->how & MCL_FUTURE) { 1068 vm_map_lock(map); 1069 vm_map_modflags(map, MAP_WIREFUTURE, 0); 1070 vm_map_unlock(map); 1071 error = 0; 1072 } 1073 1074 if (uap->how & MCL_CURRENT) { 1075 /* 1076 * P1003.1-2001 mandates that all currently mapped pages 1077 * will be memory resident and locked (wired) upon return 1078 * from mlockall(). vm_map_wire() will wire pages, by 1079 * calling vm_fault_wire() for each page in the region. 1080 */ 1081 error = vm_map_wire(map, vm_map_min(map), vm_map_max(map), 1082 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK); 1083 error = (error == KERN_SUCCESS ? 0 : EAGAIN); 1084 } 1085 #ifdef RACCT 1086 if (racct_enable && error != KERN_SUCCESS) { 1087 PROC_LOCK(td->td_proc); 1088 racct_set(td->td_proc, RACCT_MEMLOCK, 1089 ptoa(pmap_wired_count(map->pmap))); 1090 PROC_UNLOCK(td->td_proc); 1091 } 1092 #endif 1093 1094 return (error); 1095 } 1096 1097 #ifndef _SYS_SYSPROTO_H_ 1098 struct munlockall_args { 1099 register_t dummy; 1100 }; 1101 #endif 1102 1103 int 1104 sys_munlockall(struct thread *td, struct munlockall_args *uap) 1105 { 1106 vm_map_t map; 1107 int error; 1108 1109 map = &td->td_proc->p_vmspace->vm_map; 1110 error = priv_check(td, PRIV_VM_MUNLOCK); 1111 if (error) 1112 return (error); 1113 1114 /* Clear the MAP_WIREFUTURE flag from this vm_map. */ 1115 vm_map_lock(map); 1116 vm_map_modflags(map, 0, MAP_WIREFUTURE); 1117 vm_map_unlock(map); 1118 1119 /* Forcibly unwire all pages. */ 1120 error = vm_map_unwire(map, vm_map_min(map), vm_map_max(map), 1121 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK); 1122 #ifdef RACCT 1123 if (racct_enable && error == KERN_SUCCESS) { 1124 PROC_LOCK(td->td_proc); 1125 racct_set(td->td_proc, RACCT_MEMLOCK, 0); 1126 PROC_UNLOCK(td->td_proc); 1127 } 1128 #endif 1129 1130 return (error); 1131 } 1132 1133 #ifndef _SYS_SYSPROTO_H_ 1134 struct munlock_args { 1135 const void *addr; 1136 size_t len; 1137 }; 1138 #endif 1139 int 1140 sys_munlock(struct thread *td, struct munlock_args *uap) 1141 { 1142 1143 return (kern_munlock(td, (uintptr_t)uap->addr, uap->len)); 1144 } 1145 1146 int 1147 kern_munlock(struct thread *td, uintptr_t addr0, size_t size) 1148 { 1149 vm_offset_t addr, end, last, start; 1150 #ifdef RACCT 1151 vm_map_t map; 1152 #endif 1153 int error; 1154 1155 error = priv_check(td, PRIV_VM_MUNLOCK); 1156 if (error) 1157 return (error); 1158 addr = addr0; 1159 last = addr + size; 1160 start = trunc_page(addr); 1161 end = round_page(last); 1162 if (last < addr || end < addr) 1163 return (EINVAL); 1164 error = vm_map_unwire(&td->td_proc->p_vmspace->vm_map, start, end, 1165 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES); 1166 #ifdef RACCT 1167 if (racct_enable && error == KERN_SUCCESS) { 1168 PROC_LOCK(td->td_proc); 1169 map = &td->td_proc->p_vmspace->vm_map; 1170 racct_set(td->td_proc, RACCT_MEMLOCK, 1171 ptoa(pmap_wired_count(map->pmap))); 1172 PROC_UNLOCK(td->td_proc); 1173 } 1174 #endif 1175 return (error == KERN_SUCCESS ? 0 : ENOMEM); 1176 } 1177 1178 /* 1179 * vm_mmap_vnode() 1180 * 1181 * Helper function for vm_mmap. Perform sanity check specific for mmap 1182 * operations on vnodes. 1183 */ 1184 int 1185 vm_mmap_vnode(struct thread *td, vm_size_t objsize, 1186 vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp, 1187 struct vnode *vp, vm_ooffset_t *foffp, vm_object_t *objp, 1188 boolean_t *writecounted) 1189 { 1190 struct vattr va; 1191 vm_object_t obj; 1192 vm_offset_t foff; 1193 struct ucred *cred; 1194 int error, flags, locktype; 1195 1196 cred = td->td_ucred; 1197 if ((*maxprotp & VM_PROT_WRITE) && (*flagsp & MAP_SHARED)) 1198 locktype = LK_EXCLUSIVE; 1199 else 1200 locktype = LK_SHARED; 1201 if ((error = vget(vp, locktype, td)) != 0) 1202 return (error); 1203 AUDIT_ARG_VNODE1(vp); 1204 foff = *foffp; 1205 flags = *flagsp; 1206 obj = vp->v_object; 1207 if (vp->v_type == VREG) { 1208 /* 1209 * Get the proper underlying object 1210 */ 1211 if (obj == NULL) { 1212 error = EINVAL; 1213 goto done; 1214 } 1215 if (obj->type == OBJT_VNODE && obj->handle != vp) { 1216 vput(vp); 1217 vp = (struct vnode *)obj->handle; 1218 /* 1219 * Bypass filesystems obey the mpsafety of the 1220 * underlying fs. Tmpfs never bypasses. 1221 */ 1222 error = vget(vp, locktype, td); 1223 if (error != 0) 1224 return (error); 1225 } 1226 if (locktype == LK_EXCLUSIVE) { 1227 *writecounted = TRUE; 1228 vnode_pager_update_writecount(obj, 0, objsize); 1229 } 1230 } else { 1231 error = EINVAL; 1232 goto done; 1233 } 1234 if ((error = VOP_GETATTR(vp, &va, cred))) 1235 goto done; 1236 #ifdef MAC 1237 /* This relies on VM_PROT_* matching PROT_*. */ 1238 error = mac_vnode_check_mmap(cred, vp, (int)prot, flags); 1239 if (error != 0) 1240 goto done; 1241 #endif 1242 if ((flags & MAP_SHARED) != 0) { 1243 if ((va.va_flags & (SF_SNAPSHOT|IMMUTABLE|APPEND)) != 0) { 1244 if (prot & VM_PROT_WRITE) { 1245 error = EPERM; 1246 goto done; 1247 } 1248 *maxprotp &= ~VM_PROT_WRITE; 1249 } 1250 } 1251 /* 1252 * If it is a regular file without any references 1253 * we do not need to sync it. 1254 * Adjust object size to be the size of actual file. 1255 */ 1256 objsize = round_page(va.va_size); 1257 if (va.va_nlink == 0) 1258 flags |= MAP_NOSYNC; 1259 if (obj->type == OBJT_VNODE) { 1260 obj = vm_pager_allocate(OBJT_VNODE, vp, objsize, prot, foff, 1261 cred); 1262 if (obj == NULL) { 1263 error = ENOMEM; 1264 goto done; 1265 } 1266 } else { 1267 KASSERT(obj->type == OBJT_DEFAULT || obj->type == OBJT_SWAP, 1268 ("wrong object type")); 1269 VM_OBJECT_WLOCK(obj); 1270 vm_object_reference_locked(obj); 1271 #if VM_NRESERVLEVEL > 0 1272 vm_object_color(obj, 0); 1273 #endif 1274 VM_OBJECT_WUNLOCK(obj); 1275 } 1276 *objp = obj; 1277 *flagsp = flags; 1278 1279 vfs_mark_atime(vp, cred); 1280 1281 done: 1282 if (error != 0 && *writecounted) { 1283 *writecounted = FALSE; 1284 vnode_pager_update_writecount(obj, objsize, 0); 1285 } 1286 vput(vp); 1287 return (error); 1288 } 1289 1290 /* 1291 * vm_mmap_cdev() 1292 * 1293 * Helper function for vm_mmap. Perform sanity check specific for mmap 1294 * operations on cdevs. 1295 */ 1296 int 1297 vm_mmap_cdev(struct thread *td, vm_size_t objsize, vm_prot_t prot, 1298 vm_prot_t *maxprotp, int *flagsp, struct cdev *cdev, struct cdevsw *dsw, 1299 vm_ooffset_t *foff, vm_object_t *objp) 1300 { 1301 vm_object_t obj; 1302 int error, flags; 1303 1304 flags = *flagsp; 1305 1306 if (dsw->d_flags & D_MMAP_ANON) { 1307 *objp = NULL; 1308 *foff = 0; 1309 *maxprotp = VM_PROT_ALL; 1310 *flagsp |= MAP_ANON; 1311 return (0); 1312 } 1313 /* 1314 * cdevs do not provide private mappings of any kind. 1315 */ 1316 if ((*maxprotp & VM_PROT_WRITE) == 0 && 1317 (prot & VM_PROT_WRITE) != 0) 1318 return (EACCES); 1319 if (flags & (MAP_PRIVATE|MAP_COPY)) 1320 return (EINVAL); 1321 /* 1322 * Force device mappings to be shared. 1323 */ 1324 flags |= MAP_SHARED; 1325 #ifdef MAC_XXX 1326 error = mac_cdev_check_mmap(td->td_ucred, cdev, (int)prot); 1327 if (error != 0) 1328 return (error); 1329 #endif 1330 /* 1331 * First, try d_mmap_single(). If that is not implemented 1332 * (returns ENODEV), fall back to using the device pager. 1333 * Note that d_mmap_single() must return a reference to the 1334 * object (it needs to bump the reference count of the object 1335 * it returns somehow). 1336 * 1337 * XXX assumes VM_PROT_* == PROT_* 1338 */ 1339 error = dsw->d_mmap_single(cdev, foff, objsize, objp, (int)prot); 1340 if (error != ENODEV) 1341 return (error); 1342 obj = vm_pager_allocate(OBJT_DEVICE, cdev, objsize, prot, *foff, 1343 td->td_ucred); 1344 if (obj == NULL) 1345 return (EINVAL); 1346 *objp = obj; 1347 *flagsp = flags; 1348 return (0); 1349 } 1350 1351 /* 1352 * vm_mmap() 1353 * 1354 * Internal version of mmap used by exec, sys5 shared memory, and 1355 * various device drivers. Handle is either a vnode pointer, a 1356 * character device, or NULL for MAP_ANON. 1357 */ 1358 int 1359 vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot, 1360 vm_prot_t maxprot, int flags, 1361 objtype_t handle_type, void *handle, 1362 vm_ooffset_t foff) 1363 { 1364 vm_object_t object; 1365 struct thread *td = curthread; 1366 int error; 1367 boolean_t writecounted; 1368 1369 if (size == 0) 1370 return (EINVAL); 1371 1372 size = round_page(size); 1373 object = NULL; 1374 writecounted = FALSE; 1375 1376 /* 1377 * Lookup/allocate object. 1378 */ 1379 switch (handle_type) { 1380 case OBJT_DEVICE: { 1381 struct cdevsw *dsw; 1382 struct cdev *cdev; 1383 int ref; 1384 1385 cdev = handle; 1386 dsw = dev_refthread(cdev, &ref); 1387 if (dsw == NULL) 1388 return (ENXIO); 1389 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, cdev, 1390 dsw, &foff, &object); 1391 dev_relthread(cdev, ref); 1392 break; 1393 } 1394 case OBJT_VNODE: 1395 error = vm_mmap_vnode(td, size, prot, &maxprot, &flags, 1396 handle, &foff, &object, &writecounted); 1397 break; 1398 case OBJT_DEFAULT: 1399 if (handle == NULL) { 1400 error = 0; 1401 break; 1402 } 1403 /* FALLTHROUGH */ 1404 default: 1405 error = EINVAL; 1406 break; 1407 } 1408 if (error) 1409 return (error); 1410 1411 error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object, 1412 foff, writecounted, td); 1413 if (error != 0 && object != NULL) { 1414 /* 1415 * If this mapping was accounted for in the vnode's 1416 * writecount, then undo that now. 1417 */ 1418 if (writecounted) 1419 vnode_pager_release_writecount(object, 0, size); 1420 vm_object_deallocate(object); 1421 } 1422 return (error); 1423 } 1424 1425 /* 1426 * Internal version of mmap that maps a specific VM object into an 1427 * map. Called by mmap for MAP_ANON, vm_mmap, shm_mmap, and vn_mmap. 1428 */ 1429 int 1430 vm_mmap_object(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot, 1431 vm_prot_t maxprot, int flags, vm_object_t object, vm_ooffset_t foff, 1432 boolean_t writecounted, struct thread *td) 1433 { 1434 boolean_t fitit; 1435 int docow, error, findspace, rv; 1436 1437 if (map == &td->td_proc->p_vmspace->vm_map) { 1438 PROC_LOCK(td->td_proc); 1439 if (map->size + size > lim_cur_proc(td->td_proc, RLIMIT_VMEM)) { 1440 PROC_UNLOCK(td->td_proc); 1441 return (ENOMEM); 1442 } 1443 if (racct_set(td->td_proc, RACCT_VMEM, map->size + size)) { 1444 PROC_UNLOCK(td->td_proc); 1445 return (ENOMEM); 1446 } 1447 if (!old_mlock && map->flags & MAP_WIREFUTURE) { 1448 if (ptoa(pmap_wired_count(map->pmap)) + size > 1449 lim_cur_proc(td->td_proc, RLIMIT_MEMLOCK)) { 1450 racct_set_force(td->td_proc, RACCT_VMEM, 1451 map->size); 1452 PROC_UNLOCK(td->td_proc); 1453 return (ENOMEM); 1454 } 1455 error = racct_set(td->td_proc, RACCT_MEMLOCK, 1456 ptoa(pmap_wired_count(map->pmap)) + size); 1457 if (error != 0) { 1458 racct_set_force(td->td_proc, RACCT_VMEM, 1459 map->size); 1460 PROC_UNLOCK(td->td_proc); 1461 return (error); 1462 } 1463 } 1464 PROC_UNLOCK(td->td_proc); 1465 } 1466 1467 /* 1468 * We currently can only deal with page aligned file offsets. 1469 * The mmap() system call already enforces this by subtracting 1470 * the page offset from the file offset, but checking here 1471 * catches errors in device drivers (e.g. d_single_mmap() 1472 * callbacks) and other internal mapping requests (such as in 1473 * exec). 1474 */ 1475 if (foff & PAGE_MASK) 1476 return (EINVAL); 1477 1478 if ((flags & MAP_FIXED) == 0) { 1479 fitit = TRUE; 1480 *addr = round_page(*addr); 1481 } else { 1482 if (*addr != trunc_page(*addr)) 1483 return (EINVAL); 1484 fitit = FALSE; 1485 } 1486 1487 if (flags & MAP_ANON) { 1488 if (object != NULL || foff != 0) 1489 return (EINVAL); 1490 docow = 0; 1491 } else if (flags & MAP_PREFAULT_READ) 1492 docow = MAP_PREFAULT; 1493 else 1494 docow = MAP_PREFAULT_PARTIAL; 1495 1496 if ((flags & (MAP_ANON|MAP_SHARED)) == 0) 1497 docow |= MAP_COPY_ON_WRITE; 1498 if (flags & MAP_NOSYNC) 1499 docow |= MAP_DISABLE_SYNCER; 1500 if (flags & MAP_NOCORE) 1501 docow |= MAP_DISABLE_COREDUMP; 1502 /* Shared memory is also shared with children. */ 1503 if (flags & MAP_SHARED) 1504 docow |= MAP_INHERIT_SHARE; 1505 if (writecounted) 1506 docow |= MAP_VN_WRITECOUNT; 1507 if (flags & MAP_STACK) { 1508 if (object != NULL) 1509 return (EINVAL); 1510 docow |= MAP_STACK_GROWS_DOWN; 1511 } 1512 if ((flags & MAP_EXCL) != 0) 1513 docow |= MAP_CHECK_EXCL; 1514 1515 if (fitit) { 1516 if ((flags & MAP_ALIGNMENT_MASK) == MAP_ALIGNED_SUPER) 1517 findspace = VMFS_SUPER_SPACE; 1518 else if ((flags & MAP_ALIGNMENT_MASK) != 0) 1519 findspace = VMFS_ALIGNED_SPACE(flags >> 1520 MAP_ALIGNMENT_SHIFT); 1521 else 1522 findspace = VMFS_OPTIMAL_SPACE; 1523 rv = vm_map_find(map, object, foff, addr, size, 1524 #ifdef MAP_32BIT 1525 flags & MAP_32BIT ? MAP_32BIT_MAX_ADDR : 1526 #endif 1527 0, findspace, prot, maxprot, docow); 1528 } else { 1529 rv = vm_map_fixed(map, object, foff, *addr, size, 1530 prot, maxprot, docow); 1531 } 1532 1533 if (rv == KERN_SUCCESS) { 1534 /* 1535 * If the process has requested that all future mappings 1536 * be wired, then heed this. 1537 */ 1538 if (map->flags & MAP_WIREFUTURE) { 1539 vm_map_wire(map, *addr, *addr + size, 1540 VM_MAP_WIRE_USER | ((flags & MAP_STACK) ? 1541 VM_MAP_WIRE_HOLESOK : VM_MAP_WIRE_NOHOLES)); 1542 } 1543 } 1544 return (vm_mmap_to_errno(rv)); 1545 } 1546 1547 /* 1548 * Translate a Mach VM return code to zero on success or the appropriate errno 1549 * on failure. 1550 */ 1551 int 1552 vm_mmap_to_errno(int rv) 1553 { 1554 1555 switch (rv) { 1556 case KERN_SUCCESS: 1557 return (0); 1558 case KERN_INVALID_ADDRESS: 1559 case KERN_NO_SPACE: 1560 return (ENOMEM); 1561 case KERN_PROTECTION_FAILURE: 1562 return (EACCES); 1563 default: 1564 return (EINVAL); 1565 } 1566 } 1567