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sys/vm/vm_mmap.c
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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 * 4. 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: releng/8.4/sys/vm/vm_mmap.c 239592 2012-08-22 20:34:23Z kib $"); 45 46 #include "opt_compat.h" 47 #include "opt_hwpmc_hooks.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/lock.h> 52 #include <sys/mutex.h> 53 #include <sys/sysproto.h> 54 #include <sys/filedesc.h> 55 #include <sys/priv.h> 56 #include <sys/proc.h> 57 #include <sys/resource.h> 58 #include <sys/resourcevar.h> 59 #include <sys/vnode.h> 60 #include <sys/fcntl.h> 61 #include <sys/file.h> 62 #include <sys/mman.h> 63 #include <sys/mount.h> 64 #include <sys/conf.h> 65 #include <sys/stat.h> 66 #include <sys/sysent.h> 67 #include <sys/vmmeter.h> 68 69 #include <security/mac/mac_framework.h> 70 71 #include <vm/vm.h> 72 #include <vm/vm_param.h> 73 #include <vm/pmap.h> 74 #include <vm/vm_map.h> 75 #include <vm/vm_object.h> 76 #include <vm/vm_page.h> 77 #include <vm/vm_pager.h> 78 #include <vm/vm_pageout.h> 79 #include <vm/vm_extern.h> 80 #include <vm/vm_page.h> 81 82 #ifdef HWPMC_HOOKS 83 #include <sys/pmckern.h> 84 #endif 85 86 #ifndef _SYS_SYSPROTO_H_ 87 struct sbrk_args { 88 int incr; 89 }; 90 #endif 91 92 static int vm_mmap_vnode(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *, 93 int *, struct vnode *, vm_ooffset_t *, vm_object_t *); 94 static int vm_mmap_cdev(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *, 95 int *, struct cdev *, vm_ooffset_t *, vm_object_t *); 96 static int vm_mmap_shm(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *, 97 int *, struct shmfd *, vm_ooffset_t, vm_object_t *); 98 99 /* 100 * MPSAFE 101 */ 102 /* ARGSUSED */ 103 int 104 sbrk(td, uap) 105 struct thread *td; 106 struct sbrk_args *uap; 107 { 108 /* Not yet implemented */ 109 return (EOPNOTSUPP); 110 } 111 112 #ifndef _SYS_SYSPROTO_H_ 113 struct sstk_args { 114 int incr; 115 }; 116 #endif 117 118 /* 119 * MPSAFE 120 */ 121 /* ARGSUSED */ 122 int 123 sstk(td, uap) 124 struct thread *td; 125 struct sstk_args *uap; 126 { 127 /* Not yet implemented */ 128 return (EOPNOTSUPP); 129 } 130 131 #if defined(COMPAT_43) 132 #ifndef _SYS_SYSPROTO_H_ 133 struct getpagesize_args { 134 int dummy; 135 }; 136 #endif 137 138 /* ARGSUSED */ 139 int 140 ogetpagesize(td, uap) 141 struct thread *td; 142 struct getpagesize_args *uap; 143 { 144 /* MP SAFE */ 145 td->td_retval[0] = PAGE_SIZE; 146 return (0); 147 } 148 #endif /* COMPAT_43 */ 149 150 151 /* 152 * Memory Map (mmap) system call. Note that the file offset 153 * and address are allowed to be NOT page aligned, though if 154 * the MAP_FIXED flag it set, both must have the same remainder 155 * modulo the PAGE_SIZE (POSIX 1003.1b). If the address is not 156 * page-aligned, the actual mapping starts at trunc_page(addr) 157 * and the return value is adjusted up by the page offset. 158 * 159 * Generally speaking, only character devices which are themselves 160 * memory-based, such as a video framebuffer, can be mmap'd. Otherwise 161 * there would be no cache coherency between a descriptor and a VM mapping 162 * both to the same character device. 163 */ 164 #ifndef _SYS_SYSPROTO_H_ 165 struct mmap_args { 166 void *addr; 167 size_t len; 168 int prot; 169 int flags; 170 int fd; 171 long pad; 172 off_t pos; 173 }; 174 #endif 175 176 /* 177 * MPSAFE 178 */ 179 int 180 mmap(td, uap) 181 struct thread *td; 182 struct mmap_args *uap; 183 { 184 #ifdef HWPMC_HOOKS 185 struct pmckern_map_in pkm; 186 #endif 187 struct file *fp; 188 struct vnode *vp; 189 vm_offset_t addr; 190 vm_size_t size, pageoff; 191 vm_prot_t prot, maxprot; 192 void *handle; 193 objtype_t handle_type; 194 int flags, error; 195 off_t pos; 196 struct vmspace *vms = td->td_proc->p_vmspace; 197 198 addr = (vm_offset_t) uap->addr; 199 size = uap->len; 200 prot = uap->prot & VM_PROT_ALL; 201 flags = uap->flags; 202 pos = uap->pos; 203 204 fp = NULL; 205 206 /* 207 * Enforce the constraints. 208 * Mapping of length 0 is only allowed for old binaries. 209 * Anonymous mapping shall specify -1 as filedescriptor and 210 * zero position for new code. Be nice to ancient a.out 211 * binaries and correct pos for anonymous mapping, since old 212 * ld.so sometimes issues anonymous map requests with non-zero 213 * pos. 214 */ 215 if (!SV_CURPROC_FLAG(SV_AOUT)) { 216 if ((uap->len == 0 && curproc->p_osrel >= P_OSREL_MAP_ANON) || 217 ((flags & MAP_ANON) != 0 && (uap->fd != -1 || pos != 0))) 218 return (EINVAL); 219 } else { 220 if ((flags & MAP_ANON) != 0) 221 pos = 0; 222 } 223 224 if (flags & MAP_STACK) { 225 if ((uap->fd != -1) || 226 ((prot & (PROT_READ | PROT_WRITE)) != (PROT_READ | PROT_WRITE))) 227 return (EINVAL); 228 flags |= MAP_ANON; 229 pos = 0; 230 } 231 232 /* 233 * Align the file position to a page boundary, 234 * and save its page offset component. 235 */ 236 pageoff = (pos & PAGE_MASK); 237 pos -= pageoff; 238 239 /* Adjust size for rounding (on both ends). */ 240 size += pageoff; /* low end... */ 241 size = (vm_size_t) round_page(size); /* hi end */ 242 243 /* 244 * Check for illegal addresses. Watch out for address wrap... Note 245 * that VM_*_ADDRESS are not constants due to casts (argh). 246 */ 247 if (flags & MAP_FIXED) { 248 /* 249 * The specified address must have the same remainder 250 * as the file offset taken modulo PAGE_SIZE, so it 251 * should be aligned after adjustment by pageoff. 252 */ 253 addr -= pageoff; 254 if (addr & PAGE_MASK) 255 return (EINVAL); 256 /* Address range must be all in user VM space. */ 257 if (addr < vm_map_min(&vms->vm_map) || 258 addr + size > vm_map_max(&vms->vm_map)) 259 return (EINVAL); 260 if (addr + size < addr) 261 return (EINVAL); 262 } else { 263 /* 264 * XXX for non-fixed mappings where no hint is provided or 265 * the hint would fall in the potential heap space, 266 * place it after the end of the largest possible heap. 267 * 268 * There should really be a pmap call to determine a reasonable 269 * location. 270 */ 271 PROC_LOCK(td->td_proc); 272 if (addr == 0 || 273 (addr >= round_page((vm_offset_t)vms->vm_taddr) && 274 addr < round_page((vm_offset_t)vms->vm_daddr + 275 lim_max(td->td_proc, RLIMIT_DATA)))) 276 addr = round_page((vm_offset_t)vms->vm_daddr + 277 lim_max(td->td_proc, RLIMIT_DATA)); 278 PROC_UNLOCK(td->td_proc); 279 } 280 if (flags & MAP_ANON) { 281 /* 282 * Mapping blank space is trivial. 283 */ 284 handle = NULL; 285 handle_type = OBJT_DEFAULT; 286 maxprot = VM_PROT_ALL; 287 } else { 288 /* 289 * Mapping file, get fp for validation and 290 * don't let the descriptor disappear on us if we block. 291 */ 292 if ((error = fget(td, uap->fd, &fp)) != 0) 293 goto done; 294 if (fp->f_type == DTYPE_SHM) { 295 handle = fp->f_data; 296 handle_type = OBJT_SWAP; 297 maxprot = VM_PROT_NONE; 298 299 /* FREAD should always be set. */ 300 if (fp->f_flag & FREAD) 301 maxprot |= VM_PROT_EXECUTE | VM_PROT_READ; 302 if (fp->f_flag & FWRITE) 303 maxprot |= VM_PROT_WRITE; 304 goto map; 305 } 306 if (fp->f_type != DTYPE_VNODE) { 307 error = ENODEV; 308 goto done; 309 } 310 #if defined(COMPAT_FREEBSD7) || defined(COMPAT_FREEBSD6) || \ 311 defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) 312 /* 313 * POSIX shared-memory objects are defined to have 314 * kernel persistence, and are not defined to support 315 * read(2)/write(2) -- or even open(2). Thus, we can 316 * use MAP_ASYNC to trade on-disk coherence for speed. 317 * The shm_open(3) library routine turns on the FPOSIXSHM 318 * flag to request this behavior. 319 */ 320 if (fp->f_flag & FPOSIXSHM) 321 flags |= MAP_NOSYNC; 322 #endif 323 vp = fp->f_vnode; 324 /* 325 * Ensure that file and memory protections are 326 * compatible. Note that we only worry about 327 * writability if mapping is shared; in this case, 328 * current and max prot are dictated by the open file. 329 * XXX use the vnode instead? Problem is: what 330 * credentials do we use for determination? What if 331 * proc does a setuid? 332 */ 333 if (vp->v_mount != NULL && vp->v_mount->mnt_flag & MNT_NOEXEC) 334 maxprot = VM_PROT_NONE; 335 else 336 maxprot = VM_PROT_EXECUTE; 337 if (fp->f_flag & FREAD) { 338 maxprot |= VM_PROT_READ; 339 } else if (prot & PROT_READ) { 340 error = EACCES; 341 goto done; 342 } 343 /* 344 * If we are sharing potential changes (either via 345 * MAP_SHARED or via the implicit sharing of character 346 * device mappings), and we are trying to get write 347 * permission although we opened it without asking 348 * for it, bail out. 349 */ 350 if ((flags & MAP_SHARED) != 0) { 351 if ((fp->f_flag & FWRITE) != 0) { 352 maxprot |= VM_PROT_WRITE; 353 } else if ((prot & PROT_WRITE) != 0) { 354 error = EACCES; 355 goto done; 356 } 357 } else if (vp->v_type != VCHR || (fp->f_flag & FWRITE) != 0) { 358 maxprot |= VM_PROT_WRITE; 359 } 360 handle = (void *)vp; 361 handle_type = OBJT_VNODE; 362 } 363 map: 364 td->td_fpop = fp; 365 error = vm_mmap(&vms->vm_map, &addr, size, prot, maxprot, 366 flags, handle_type, handle, pos); 367 td->td_fpop = NULL; 368 #ifdef HWPMC_HOOKS 369 /* inform hwpmc(4) if an executable is being mapped */ 370 if (error == 0 && handle_type == OBJT_VNODE && 371 (prot & PROT_EXEC)) { 372 pkm.pm_file = handle; 373 pkm.pm_address = (uintptr_t) addr; 374 PMC_CALL_HOOK(td, PMC_FN_MMAP, (void *) &pkm); 375 } 376 #endif 377 if (error == 0) 378 td->td_retval[0] = (register_t) (addr + pageoff); 379 done: 380 if (fp) 381 fdrop(fp, td); 382 383 return (error); 384 } 385 386 int 387 freebsd6_mmap(struct thread *td, struct freebsd6_mmap_args *uap) 388 { 389 struct mmap_args oargs; 390 391 oargs.addr = uap->addr; 392 oargs.len = uap->len; 393 oargs.prot = uap->prot; 394 oargs.flags = uap->flags; 395 oargs.fd = uap->fd; 396 oargs.pos = uap->pos; 397 return (mmap(td, &oargs)); 398 } 399 400 #ifdef COMPAT_43 401 #ifndef _SYS_SYSPROTO_H_ 402 struct ommap_args { 403 caddr_t addr; 404 int len; 405 int prot; 406 int flags; 407 int fd; 408 long pos; 409 }; 410 #endif 411 int 412 ommap(td, uap) 413 struct thread *td; 414 struct ommap_args *uap; 415 { 416 struct mmap_args nargs; 417 static const char cvtbsdprot[8] = { 418 0, 419 PROT_EXEC, 420 PROT_WRITE, 421 PROT_EXEC | PROT_WRITE, 422 PROT_READ, 423 PROT_EXEC | PROT_READ, 424 PROT_WRITE | PROT_READ, 425 PROT_EXEC | PROT_WRITE | PROT_READ, 426 }; 427 428 #define OMAP_ANON 0x0002 429 #define OMAP_COPY 0x0020 430 #define OMAP_SHARED 0x0010 431 #define OMAP_FIXED 0x0100 432 433 nargs.addr = uap->addr; 434 nargs.len = uap->len; 435 nargs.prot = cvtbsdprot[uap->prot & 0x7]; 436 nargs.flags = 0; 437 if (uap->flags & OMAP_ANON) 438 nargs.flags |= MAP_ANON; 439 if (uap->flags & OMAP_COPY) 440 nargs.flags |= MAP_COPY; 441 if (uap->flags & OMAP_SHARED) 442 nargs.flags |= MAP_SHARED; 443 else 444 nargs.flags |= MAP_PRIVATE; 445 if (uap->flags & OMAP_FIXED) 446 nargs.flags |= MAP_FIXED; 447 nargs.fd = uap->fd; 448 nargs.pos = uap->pos; 449 return (mmap(td, &nargs)); 450 } 451 #endif /* COMPAT_43 */ 452 453 454 #ifndef _SYS_SYSPROTO_H_ 455 struct msync_args { 456 void *addr; 457 size_t len; 458 int flags; 459 }; 460 #endif 461 /* 462 * MPSAFE 463 */ 464 int 465 msync(td, uap) 466 struct thread *td; 467 struct msync_args *uap; 468 { 469 vm_offset_t addr; 470 vm_size_t size, pageoff; 471 int flags; 472 vm_map_t map; 473 int rv; 474 475 addr = (vm_offset_t) uap->addr; 476 size = uap->len; 477 flags = uap->flags; 478 479 pageoff = (addr & PAGE_MASK); 480 addr -= pageoff; 481 size += pageoff; 482 size = (vm_size_t) round_page(size); 483 if (addr + size < addr) 484 return (EINVAL); 485 486 if ((flags & (MS_ASYNC|MS_INVALIDATE)) == (MS_ASYNC|MS_INVALIDATE)) 487 return (EINVAL); 488 489 map = &td->td_proc->p_vmspace->vm_map; 490 491 /* 492 * Clean the pages and interpret the return value. 493 */ 494 rv = vm_map_sync(map, addr, addr + size, (flags & MS_ASYNC) == 0, 495 (flags & MS_INVALIDATE) != 0); 496 switch (rv) { 497 case KERN_SUCCESS: 498 return (0); 499 case KERN_INVALID_ADDRESS: 500 return (EINVAL); /* Sun returns ENOMEM? */ 501 case KERN_INVALID_ARGUMENT: 502 return (EBUSY); 503 case KERN_FAILURE: 504 return (EIO); 505 default: 506 return (EINVAL); 507 } 508 } 509 510 #ifndef _SYS_SYSPROTO_H_ 511 struct munmap_args { 512 void *addr; 513 size_t len; 514 }; 515 #endif 516 /* 517 * MPSAFE 518 */ 519 int 520 munmap(td, uap) 521 struct thread *td; 522 struct munmap_args *uap; 523 { 524 #ifdef HWPMC_HOOKS 525 struct pmckern_map_out pkm; 526 vm_map_entry_t entry; 527 #endif 528 vm_offset_t addr; 529 vm_size_t size, pageoff; 530 vm_map_t map; 531 532 addr = (vm_offset_t) uap->addr; 533 size = uap->len; 534 if (size == 0) 535 return (EINVAL); 536 537 pageoff = (addr & PAGE_MASK); 538 addr -= pageoff; 539 size += pageoff; 540 size = (vm_size_t) round_page(size); 541 if (addr + size < addr) 542 return (EINVAL); 543 544 /* 545 * Check for illegal addresses. Watch out for address wrap... 546 */ 547 map = &td->td_proc->p_vmspace->vm_map; 548 if (addr < vm_map_min(map) || addr + size > vm_map_max(map)) 549 return (EINVAL); 550 vm_map_lock(map); 551 #ifdef HWPMC_HOOKS 552 /* 553 * Inform hwpmc if the address range being unmapped contains 554 * an executable region. 555 */ 556 pkm.pm_address = (uintptr_t) NULL; 557 if (vm_map_lookup_entry(map, addr, &entry)) { 558 for (; 559 entry != &map->header && entry->start < addr + size; 560 entry = entry->next) { 561 if (vm_map_check_protection(map, entry->start, 562 entry->end, VM_PROT_EXECUTE) == TRUE) { 563 pkm.pm_address = (uintptr_t) addr; 564 pkm.pm_size = (size_t) size; 565 break; 566 } 567 } 568 } 569 #endif 570 vm_map_delete(map, addr, addr + size); 571 572 #ifdef HWPMC_HOOKS 573 /* downgrade the lock to prevent a LOR with the pmc-sx lock */ 574 vm_map_lock_downgrade(map); 575 if (pkm.pm_address != (uintptr_t) NULL) 576 PMC_CALL_HOOK(td, PMC_FN_MUNMAP, (void *) &pkm); 577 vm_map_unlock_read(map); 578 #else 579 vm_map_unlock(map); 580 #endif 581 /* vm_map_delete returns nothing but KERN_SUCCESS anyway */ 582 return (0); 583 } 584 585 #ifndef _SYS_SYSPROTO_H_ 586 struct mprotect_args { 587 const void *addr; 588 size_t len; 589 int prot; 590 }; 591 #endif 592 /* 593 * MPSAFE 594 */ 595 int 596 mprotect(td, uap) 597 struct thread *td; 598 struct mprotect_args *uap; 599 { 600 vm_offset_t addr; 601 vm_size_t size, pageoff; 602 vm_prot_t prot; 603 604 addr = (vm_offset_t) uap->addr; 605 size = uap->len; 606 prot = uap->prot & VM_PROT_ALL; 607 608 pageoff = (addr & PAGE_MASK); 609 addr -= pageoff; 610 size += pageoff; 611 size = (vm_size_t) round_page(size); 612 if (addr + size < addr) 613 return (EINVAL); 614 615 switch (vm_map_protect(&td->td_proc->p_vmspace->vm_map, addr, 616 addr + size, prot, FALSE)) { 617 case KERN_SUCCESS: 618 return (0); 619 case KERN_PROTECTION_FAILURE: 620 return (EACCES); 621 case KERN_RESOURCE_SHORTAGE: 622 return (ENOMEM); 623 } 624 return (EINVAL); 625 } 626 627 #ifndef _SYS_SYSPROTO_H_ 628 struct minherit_args { 629 void *addr; 630 size_t len; 631 int inherit; 632 }; 633 #endif 634 /* 635 * MPSAFE 636 */ 637 int 638 minherit(td, uap) 639 struct thread *td; 640 struct minherit_args *uap; 641 { 642 vm_offset_t addr; 643 vm_size_t size, pageoff; 644 vm_inherit_t inherit; 645 646 addr = (vm_offset_t)uap->addr; 647 size = uap->len; 648 inherit = uap->inherit; 649 650 pageoff = (addr & PAGE_MASK); 651 addr -= pageoff; 652 size += pageoff; 653 size = (vm_size_t) round_page(size); 654 if (addr + size < addr) 655 return (EINVAL); 656 657 switch (vm_map_inherit(&td->td_proc->p_vmspace->vm_map, addr, 658 addr + size, inherit)) { 659 case KERN_SUCCESS: 660 return (0); 661 case KERN_PROTECTION_FAILURE: 662 return (EACCES); 663 } 664 return (EINVAL); 665 } 666 667 #ifndef _SYS_SYSPROTO_H_ 668 struct madvise_args { 669 void *addr; 670 size_t len; 671 int behav; 672 }; 673 #endif 674 675 /* 676 * MPSAFE 677 */ 678 /* ARGSUSED */ 679 int 680 madvise(td, uap) 681 struct thread *td; 682 struct madvise_args *uap; 683 { 684 vm_offset_t start, end; 685 vm_map_t map; 686 struct proc *p; 687 int error; 688 689 /* 690 * Check for our special case, advising the swap pager we are 691 * "immortal." 692 */ 693 if (uap->behav == MADV_PROTECT) { 694 error = priv_check(td, PRIV_VM_MADV_PROTECT); 695 if (error == 0) { 696 p = td->td_proc; 697 PROC_LOCK(p); 698 p->p_flag |= P_PROTECTED; 699 PROC_UNLOCK(p); 700 } 701 return (error); 702 } 703 /* 704 * Check for illegal behavior 705 */ 706 if (uap->behav < 0 || uap->behav > MADV_CORE) 707 return (EINVAL); 708 /* 709 * Check for illegal addresses. Watch out for address wrap... Note 710 * that VM_*_ADDRESS are not constants due to casts (argh). 711 */ 712 map = &td->td_proc->p_vmspace->vm_map; 713 if ((vm_offset_t)uap->addr < vm_map_min(map) || 714 (vm_offset_t)uap->addr + uap->len > vm_map_max(map)) 715 return (EINVAL); 716 if (((vm_offset_t) uap->addr + uap->len) < (vm_offset_t) uap->addr) 717 return (EINVAL); 718 719 /* 720 * Since this routine is only advisory, we default to conservative 721 * behavior. 722 */ 723 start = trunc_page((vm_offset_t) uap->addr); 724 end = round_page((vm_offset_t) uap->addr + uap->len); 725 726 if (vm_map_madvise(map, start, end, uap->behav)) 727 return (EINVAL); 728 return (0); 729 } 730 731 #ifndef _SYS_SYSPROTO_H_ 732 struct mincore_args { 733 const void *addr; 734 size_t len; 735 char *vec; 736 }; 737 #endif 738 739 /* 740 * MPSAFE 741 */ 742 /* ARGSUSED */ 743 int 744 mincore(td, uap) 745 struct thread *td; 746 struct mincore_args *uap; 747 { 748 vm_offset_t addr, first_addr; 749 vm_offset_t end, cend; 750 pmap_t pmap; 751 vm_map_t map; 752 char *vec; 753 int error = 0; 754 int vecindex, lastvecindex; 755 vm_map_entry_t current; 756 vm_map_entry_t entry; 757 int mincoreinfo; 758 unsigned int timestamp; 759 760 /* 761 * Make sure that the addresses presented are valid for user 762 * mode. 763 */ 764 first_addr = addr = trunc_page((vm_offset_t) uap->addr); 765 end = addr + (vm_size_t)round_page(uap->len); 766 map = &td->td_proc->p_vmspace->vm_map; 767 if (end > vm_map_max(map) || end < addr) 768 return (ENOMEM); 769 770 /* 771 * Address of byte vector 772 */ 773 vec = uap->vec; 774 775 pmap = vmspace_pmap(td->td_proc->p_vmspace); 776 777 vm_map_lock_read(map); 778 RestartScan: 779 timestamp = map->timestamp; 780 781 if (!vm_map_lookup_entry(map, addr, &entry)) { 782 vm_map_unlock_read(map); 783 return (ENOMEM); 784 } 785 786 /* 787 * Do this on a map entry basis so that if the pages are not 788 * in the current processes address space, we can easily look 789 * up the pages elsewhere. 790 */ 791 lastvecindex = -1; 792 for (current = entry; 793 (current != &map->header) && (current->start < end); 794 current = current->next) { 795 796 /* 797 * check for contiguity 798 */ 799 if (current->end < end && 800 (entry->next == &map->header || 801 current->next->start > current->end)) { 802 vm_map_unlock_read(map); 803 return (ENOMEM); 804 } 805 806 /* 807 * ignore submaps (for now) or null objects 808 */ 809 if ((current->eflags & MAP_ENTRY_IS_SUB_MAP) || 810 current->object.vm_object == NULL) 811 continue; 812 813 /* 814 * limit this scan to the current map entry and the 815 * limits for the mincore call 816 */ 817 if (addr < current->start) 818 addr = current->start; 819 cend = current->end; 820 if (cend > end) 821 cend = end; 822 823 /* 824 * scan this entry one page at a time 825 */ 826 while (addr < cend) { 827 /* 828 * Check pmap first, it is likely faster, also 829 * it can provide info as to whether we are the 830 * one referencing or modifying the page. 831 */ 832 mincoreinfo = pmap_mincore(pmap, addr); 833 if (!mincoreinfo) { 834 vm_pindex_t pindex; 835 vm_ooffset_t offset; 836 vm_page_t m; 837 /* 838 * calculate the page index into the object 839 */ 840 offset = current->offset + (addr - current->start); 841 pindex = OFF_TO_IDX(offset); 842 VM_OBJECT_LOCK(current->object.vm_object); 843 m = vm_page_lookup(current->object.vm_object, 844 pindex); 845 /* 846 * if the page is resident, then gather information about 847 * it. 848 */ 849 if (m != NULL && m->valid != 0) { 850 mincoreinfo = MINCORE_INCORE; 851 vm_page_lock_queues(); 852 if (m->dirty || 853 pmap_is_modified(m)) 854 mincoreinfo |= MINCORE_MODIFIED_OTHER; 855 if ((m->flags & PG_REFERENCED) || 856 pmap_ts_referenced(m)) { 857 vm_page_flag_set(m, PG_REFERENCED); 858 mincoreinfo |= MINCORE_REFERENCED_OTHER; 859 } 860 vm_page_unlock_queues(); 861 } 862 VM_OBJECT_UNLOCK(current->object.vm_object); 863 } 864 865 /* 866 * subyte may page fault. In case it needs to modify 867 * the map, we release the lock. 868 */ 869 vm_map_unlock_read(map); 870 871 /* 872 * calculate index into user supplied byte vector 873 */ 874 vecindex = OFF_TO_IDX(addr - first_addr); 875 876 /* 877 * If we have skipped map entries, we need to make sure that 878 * the byte vector is zeroed for those skipped entries. 879 */ 880 while ((lastvecindex + 1) < vecindex) { 881 error = subyte(vec + lastvecindex, 0); 882 if (error) { 883 error = EFAULT; 884 goto done2; 885 } 886 ++lastvecindex; 887 } 888 889 /* 890 * Pass the page information to the user 891 */ 892 error = subyte(vec + vecindex, mincoreinfo); 893 if (error) { 894 error = EFAULT; 895 goto done2; 896 } 897 898 /* 899 * If the map has changed, due to the subyte, the previous 900 * output may be invalid. 901 */ 902 vm_map_lock_read(map); 903 if (timestamp != map->timestamp) 904 goto RestartScan; 905 906 lastvecindex = vecindex; 907 addr += PAGE_SIZE; 908 } 909 } 910 911 /* 912 * subyte may page fault. In case it needs to modify 913 * the map, we release the lock. 914 */ 915 vm_map_unlock_read(map); 916 917 /* 918 * Zero the last entries in the byte vector. 919 */ 920 vecindex = OFF_TO_IDX(end - first_addr); 921 while ((lastvecindex + 1) < vecindex) { 922 error = subyte(vec + lastvecindex, 0); 923 if (error) { 924 error = EFAULT; 925 goto done2; 926 } 927 ++lastvecindex; 928 } 929 930 /* 931 * If the map has changed, due to the subyte, the previous 932 * output may be invalid. 933 */ 934 vm_map_lock_read(map); 935 if (timestamp != map->timestamp) 936 goto RestartScan; 937 vm_map_unlock_read(map); 938 done2: 939 return (error); 940 } 941 942 #ifndef _SYS_SYSPROTO_H_ 943 struct mlock_args { 944 const void *addr; 945 size_t len; 946 }; 947 #endif 948 /* 949 * MPSAFE 950 */ 951 int 952 mlock(td, uap) 953 struct thread *td; 954 struct mlock_args *uap; 955 { 956 struct proc *proc; 957 vm_offset_t addr, end, last, start; 958 vm_size_t npages, size; 959 int error; 960 961 error = priv_check(td, PRIV_VM_MLOCK); 962 if (error) 963 return (error); 964 addr = (vm_offset_t)uap->addr; 965 size = uap->len; 966 last = addr + size; 967 start = trunc_page(addr); 968 end = round_page(last); 969 if (last < addr || end < addr) 970 return (EINVAL); 971 npages = atop(end - start); 972 if (npages > vm_page_max_wired) 973 return (ENOMEM); 974 proc = td->td_proc; 975 PROC_LOCK(proc); 976 if (ptoa(npages + 977 pmap_wired_count(vm_map_pmap(&proc->p_vmspace->vm_map))) > 978 lim_cur(proc, RLIMIT_MEMLOCK)) { 979 PROC_UNLOCK(proc); 980 return (ENOMEM); 981 } 982 PROC_UNLOCK(proc); 983 if (npages + cnt.v_wire_count > vm_page_max_wired) 984 return (EAGAIN); 985 error = vm_map_wire(&proc->p_vmspace->vm_map, start, end, 986 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES); 987 return (error == KERN_SUCCESS ? 0 : ENOMEM); 988 } 989 990 #ifndef _SYS_SYSPROTO_H_ 991 struct mlockall_args { 992 int how; 993 }; 994 #endif 995 996 /* 997 * MPSAFE 998 */ 999 int 1000 mlockall(td, uap) 1001 struct thread *td; 1002 struct mlockall_args *uap; 1003 { 1004 vm_map_t map; 1005 int error; 1006 1007 map = &td->td_proc->p_vmspace->vm_map; 1008 error = 0; 1009 1010 if ((uap->how == 0) || ((uap->how & ~(MCL_CURRENT|MCL_FUTURE)) != 0)) 1011 return (EINVAL); 1012 1013 #if 0 1014 /* 1015 * If wiring all pages in the process would cause it to exceed 1016 * a hard resource limit, return ENOMEM. 1017 */ 1018 PROC_LOCK(td->td_proc); 1019 if (map->size - ptoa(pmap_wired_count(vm_map_pmap(map)) > 1020 lim_cur(td->td_proc, RLIMIT_MEMLOCK))) { 1021 PROC_UNLOCK(td->td_proc); 1022 return (ENOMEM); 1023 } 1024 PROC_UNLOCK(td->td_proc); 1025 #else 1026 error = priv_check(td, PRIV_VM_MLOCK); 1027 if (error) 1028 return (error); 1029 #endif 1030 1031 if (uap->how & MCL_FUTURE) { 1032 vm_map_lock(map); 1033 vm_map_modflags(map, MAP_WIREFUTURE, 0); 1034 vm_map_unlock(map); 1035 error = 0; 1036 } 1037 1038 if (uap->how & MCL_CURRENT) { 1039 /* 1040 * P1003.1-2001 mandates that all currently mapped pages 1041 * will be memory resident and locked (wired) upon return 1042 * from mlockall(). vm_map_wire() will wire pages, by 1043 * calling vm_fault_wire() for each page in the region. 1044 */ 1045 error = vm_map_wire(map, vm_map_min(map), vm_map_max(map), 1046 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK); 1047 error = (error == KERN_SUCCESS ? 0 : EAGAIN); 1048 } 1049 1050 return (error); 1051 } 1052 1053 #ifndef _SYS_SYSPROTO_H_ 1054 struct munlockall_args { 1055 register_t dummy; 1056 }; 1057 #endif 1058 1059 /* 1060 * MPSAFE 1061 */ 1062 int 1063 munlockall(td, uap) 1064 struct thread *td; 1065 struct munlockall_args *uap; 1066 { 1067 vm_map_t map; 1068 int error; 1069 1070 map = &td->td_proc->p_vmspace->vm_map; 1071 error = priv_check(td, PRIV_VM_MUNLOCK); 1072 if (error) 1073 return (error); 1074 1075 /* Clear the MAP_WIREFUTURE flag from this vm_map. */ 1076 vm_map_lock(map); 1077 vm_map_modflags(map, 0, MAP_WIREFUTURE); 1078 vm_map_unlock(map); 1079 1080 /* Forcibly unwire all pages. */ 1081 error = vm_map_unwire(map, vm_map_min(map), vm_map_max(map), 1082 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK); 1083 1084 return (error); 1085 } 1086 1087 #ifndef _SYS_SYSPROTO_H_ 1088 struct munlock_args { 1089 const void *addr; 1090 size_t len; 1091 }; 1092 #endif 1093 /* 1094 * MPSAFE 1095 */ 1096 int 1097 munlock(td, uap) 1098 struct thread *td; 1099 struct munlock_args *uap; 1100 { 1101 vm_offset_t addr, end, last, start; 1102 vm_size_t size; 1103 int error; 1104 1105 error = priv_check(td, PRIV_VM_MUNLOCK); 1106 if (error) 1107 return (error); 1108 addr = (vm_offset_t)uap->addr; 1109 size = uap->len; 1110 last = addr + size; 1111 start = trunc_page(addr); 1112 end = round_page(last); 1113 if (last < addr || end < addr) 1114 return (EINVAL); 1115 error = vm_map_unwire(&td->td_proc->p_vmspace->vm_map, start, end, 1116 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES); 1117 return (error == KERN_SUCCESS ? 0 : ENOMEM); 1118 } 1119 1120 /* 1121 * vm_mmap_vnode() 1122 * 1123 * MPSAFE 1124 * 1125 * Helper function for vm_mmap. Perform sanity check specific for mmap 1126 * operations on vnodes. 1127 */ 1128 int 1129 vm_mmap_vnode(struct thread *td, vm_size_t objsize, 1130 vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp, 1131 struct vnode *vp, vm_ooffset_t *foffp, vm_object_t *objp) 1132 { 1133 struct vattr va; 1134 vm_object_t obj; 1135 vm_offset_t foff; 1136 struct mount *mp; 1137 struct ucred *cred; 1138 int error, flags; 1139 int vfslocked; 1140 1141 mp = vp->v_mount; 1142 cred = td->td_ucred; 1143 vfslocked = VFS_LOCK_GIANT(mp); 1144 if ((error = vget(vp, LK_SHARED, td)) != 0) { 1145 VFS_UNLOCK_GIANT(vfslocked); 1146 return (error); 1147 } 1148 foff = *foffp; 1149 flags = *flagsp; 1150 obj = vp->v_object; 1151 if (vp->v_type == VREG) { 1152 /* 1153 * Get the proper underlying object 1154 */ 1155 if (obj == NULL) { 1156 error = EINVAL; 1157 goto done; 1158 } 1159 if (obj->handle != vp) { 1160 vput(vp); 1161 vp = (struct vnode*)obj->handle; 1162 vget(vp, LK_SHARED, td); 1163 } 1164 } else if (vp->v_type == VCHR) { 1165 error = vm_mmap_cdev(td, objsize, prot, maxprotp, flagsp, 1166 vp->v_rdev, foffp, objp); 1167 if (error == 0) 1168 goto mark_atime; 1169 goto done; 1170 } else { 1171 error = EINVAL; 1172 goto done; 1173 } 1174 if ((error = VOP_GETATTR(vp, &va, cred))) 1175 goto done; 1176 #ifdef MAC 1177 error = mac_vnode_check_mmap(cred, vp, prot, flags); 1178 if (error != 0) 1179 goto done; 1180 #endif 1181 if ((flags & MAP_SHARED) != 0) { 1182 if ((va.va_flags & (SF_SNAPSHOT|IMMUTABLE|APPEND)) != 0) { 1183 if (prot & PROT_WRITE) { 1184 error = EPERM; 1185 goto done; 1186 } 1187 *maxprotp &= ~VM_PROT_WRITE; 1188 } 1189 } 1190 /* 1191 * If it is a regular file without any references 1192 * we do not need to sync it. 1193 * Adjust object size to be the size of actual file. 1194 */ 1195 objsize = round_page(va.va_size); 1196 if (va.va_nlink == 0) 1197 flags |= MAP_NOSYNC; 1198 obj = vm_pager_allocate(OBJT_VNODE, vp, objsize, prot, foff, td->td_ucred); 1199 if (obj == NULL) { 1200 error = ENOMEM; 1201 goto done; 1202 } 1203 *objp = obj; 1204 *flagsp = flags; 1205 1206 mark_atime: 1207 vfs_mark_atime(vp, cred); 1208 1209 done: 1210 vput(vp); 1211 VFS_UNLOCK_GIANT(vfslocked); 1212 return (error); 1213 } 1214 1215 /* 1216 * vm_mmap_cdev() 1217 * 1218 * MPSAFE 1219 * 1220 * Helper function for vm_mmap. Perform sanity check specific for mmap 1221 * operations on cdevs. 1222 */ 1223 int 1224 vm_mmap_cdev(struct thread *td, vm_size_t objsize, 1225 vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp, 1226 struct cdev *cdev, vm_ooffset_t *foff, vm_object_t *objp) 1227 { 1228 vm_object_t obj; 1229 struct cdevsw *dsw; 1230 int error, flags, ref; 1231 1232 flags = *flagsp; 1233 1234 dsw = dev_refthread(cdev, &ref); 1235 if (dsw == NULL) 1236 return (ENXIO); 1237 if (dsw->d_flags & D_MMAP_ANON) { 1238 dev_relthread(cdev, ref); 1239 *maxprotp = VM_PROT_ALL; 1240 *flagsp |= MAP_ANON; 1241 return (0); 1242 } 1243 /* 1244 * cdevs do not provide private mappings of any kind. 1245 */ 1246 if ((*maxprotp & VM_PROT_WRITE) == 0 && 1247 (prot & PROT_WRITE) != 0) { 1248 dev_relthread(cdev, ref); 1249 return (EACCES); 1250 } 1251 if (flags & (MAP_PRIVATE|MAP_COPY)) { 1252 dev_relthread(cdev, ref); 1253 return (EINVAL); 1254 } 1255 /* 1256 * Force device mappings to be shared. 1257 */ 1258 flags |= MAP_SHARED; 1259 #ifdef MAC_XXX 1260 error = mac_cdev_check_mmap(td->td_ucred, cdev, prot); 1261 if (error != 0) { 1262 dev_relthread(cdev, ref); 1263 return (error); 1264 } 1265 #endif 1266 /* 1267 * First, try d_mmap_single(). If that is not implemented 1268 * (returns ENODEV), fall back to using the device pager. 1269 * Note that d_mmap_single() must return a reference to the 1270 * object (it needs to bump the reference count of the object 1271 * it returns somehow). 1272 * 1273 * XXX assumes VM_PROT_* == PROT_* 1274 */ 1275 error = dsw->d_mmap_single(cdev, foff, objsize, objp, (int)prot); 1276 dev_relthread(cdev, ref); 1277 if (error != ENODEV) 1278 return (error); 1279 obj = vm_pager_allocate(OBJT_DEVICE, cdev, objsize, prot, *foff, 1280 td->td_ucred); 1281 if (obj == NULL) 1282 return (EINVAL); 1283 *objp = obj; 1284 *flagsp = flags; 1285 return (0); 1286 } 1287 1288 /* 1289 * vm_mmap_shm() 1290 * 1291 * MPSAFE 1292 * 1293 * Helper function for vm_mmap. Perform sanity check specific for mmap 1294 * operations on shm file descriptors. 1295 */ 1296 int 1297 vm_mmap_shm(struct thread *td, vm_size_t objsize, 1298 vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp, 1299 struct shmfd *shmfd, vm_ooffset_t foff, vm_object_t *objp) 1300 { 1301 int error; 1302 1303 if ((*flagsp & MAP_SHARED) != 0 && 1304 (*maxprotp & VM_PROT_WRITE) == 0 && 1305 (prot & PROT_WRITE) != 0) 1306 return (EACCES); 1307 #ifdef MAC 1308 error = mac_posixshm_check_mmap(td->td_ucred, shmfd, prot, *flagsp); 1309 if (error != 0) 1310 return (error); 1311 #endif 1312 error = shm_mmap(shmfd, objsize, foff, objp); 1313 if (error) 1314 return (error); 1315 return (0); 1316 } 1317 1318 /* 1319 * vm_mmap() 1320 * 1321 * MPSAFE 1322 * 1323 * Internal version of mmap. Currently used by mmap, exec, and sys5 1324 * shared memory. Handle is either a vnode pointer or NULL for MAP_ANON. 1325 */ 1326 int 1327 vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot, 1328 vm_prot_t maxprot, int flags, 1329 objtype_t handle_type, void *handle, 1330 vm_ooffset_t foff) 1331 { 1332 boolean_t fitit; 1333 vm_object_t object = NULL; 1334 int rv = KERN_SUCCESS; 1335 int docow, error; 1336 struct thread *td = curthread; 1337 1338 if (size == 0) 1339 return (0); 1340 1341 size = round_page(size); 1342 1343 PROC_LOCK(td->td_proc); 1344 if (td->td_proc->p_vmspace->vm_map.size + size > 1345 lim_cur(td->td_proc, RLIMIT_VMEM)) { 1346 PROC_UNLOCK(td->td_proc); 1347 return (ENOMEM); 1348 } 1349 PROC_UNLOCK(td->td_proc); 1350 1351 /* 1352 * We currently can only deal with page aligned file offsets. 1353 * The check is here rather than in the syscall because the 1354 * kernel calls this function internally for other mmaping 1355 * operations (such as in exec) and non-aligned offsets will 1356 * cause pmap inconsistencies...so we want to be sure to 1357 * disallow this in all cases. 1358 */ 1359 if (foff & PAGE_MASK) 1360 return (EINVAL); 1361 1362 if ((flags & MAP_FIXED) == 0) { 1363 fitit = TRUE; 1364 *addr = round_page(*addr); 1365 } else { 1366 if (*addr != trunc_page(*addr)) 1367 return (EINVAL); 1368 fitit = FALSE; 1369 } 1370 /* 1371 * Lookup/allocate object. 1372 */ 1373 switch (handle_type) { 1374 case OBJT_DEVICE: 1375 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, 1376 handle, &foff, &object); 1377 break; 1378 case OBJT_VNODE: 1379 error = vm_mmap_vnode(td, size, prot, &maxprot, &flags, 1380 handle, &foff, &object); 1381 break; 1382 case OBJT_SWAP: 1383 error = vm_mmap_shm(td, size, prot, &maxprot, &flags, 1384 handle, foff, &object); 1385 break; 1386 case OBJT_DEFAULT: 1387 if (handle == NULL) { 1388 error = 0; 1389 break; 1390 } 1391 /* FALLTHROUGH */ 1392 default: 1393 error = EINVAL; 1394 break; 1395 } 1396 if (error) 1397 return (error); 1398 if (flags & MAP_ANON) { 1399 object = NULL; 1400 docow = 0; 1401 /* 1402 * Unnamed anonymous regions always start at 0. 1403 */ 1404 if (handle == 0) 1405 foff = 0; 1406 } else if (flags & MAP_PREFAULT_READ) 1407 docow = MAP_PREFAULT; 1408 else 1409 docow = MAP_PREFAULT_PARTIAL; 1410 1411 if ((flags & (MAP_ANON|MAP_SHARED)) == 0) 1412 docow |= MAP_COPY_ON_WRITE; 1413 if (flags & MAP_NOSYNC) 1414 docow |= MAP_DISABLE_SYNCER; 1415 if (flags & MAP_NOCORE) 1416 docow |= MAP_DISABLE_COREDUMP; 1417 1418 if (flags & MAP_STACK) 1419 rv = vm_map_stack(map, *addr, size, prot, maxprot, 1420 docow | MAP_STACK_GROWS_DOWN); 1421 else if (fitit) 1422 rv = vm_map_find(map, object, foff, addr, size, 1423 object != NULL && object->type == OBJT_DEVICE ? 1424 VMFS_ALIGNED_SPACE : VMFS_ANY_SPACE, prot, maxprot, docow); 1425 else 1426 rv = vm_map_fixed(map, object, foff, *addr, size, 1427 prot, maxprot, docow); 1428 1429 if (rv != KERN_SUCCESS) { 1430 /* 1431 * Lose the object reference. Will destroy the 1432 * object if it's an unnamed anonymous mapping 1433 * or named anonymous without other references. 1434 */ 1435 vm_object_deallocate(object); 1436 } else if (flags & MAP_SHARED) { 1437 /* 1438 * Shared memory is also shared with children. 1439 */ 1440 rv = vm_map_inherit(map, *addr, *addr + size, VM_INHERIT_SHARE); 1441 if (rv != KERN_SUCCESS) 1442 (void) vm_map_remove(map, *addr, *addr + size); 1443 } 1444 1445 /* 1446 * If the process has requested that all future mappings 1447 * be wired, then heed this. 1448 */ 1449 if ((rv == KERN_SUCCESS) && (map->flags & MAP_WIREFUTURE)) 1450 vm_map_wire(map, *addr, *addr + size, 1451 VM_MAP_WIRE_USER | ((flags & MAP_STACK) ? 1452 VM_MAP_WIRE_HOLESOK : VM_MAP_WIRE_NOHOLES)); 1453 1454 return (vm_mmap_to_errno(rv)); 1455 } 1456 1457 int 1458 vm_mmap_to_errno(int rv) 1459 { 1460 1461 switch (rv) { 1462 case KERN_SUCCESS: 1463 return (0); 1464 case KERN_INVALID_ADDRESS: 1465 case KERN_NO_SPACE: 1466 return (ENOMEM); 1467 case KERN_PROTECTION_FAILURE: 1468 return (EACCES); 1469 default: 1470 return (EINVAL); 1471 } 1472 }
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