1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1988 University of Utah. 5 * Copyright (c) 1991, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * the Systems Programming Group of the University of Utah Computer 10 * Science Department. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$ 37 */ 38 39 /* 40 * Mapped file (mmap) interface to VM 41 */ 42 43 #include "opt_hwpmc_hooks.h" 44 #include "opt_hwt_hooks.h" 45 #include "opt_vm.h" 46 47 #define EXTERR_CATEGORY EXTERR_CAT_MMAP 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/capsicum.h> 51 #include <sys/exterrvar.h> 52 #include <sys/kernel.h> 53 #include <sys/lock.h> 54 #include <sys/mutex.h> 55 #include <sys/sysproto.h> 56 #include <sys/elf.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 #if defined(__amd64__) || defined(__i386__) /* for i386_read_exec */ 77 #include <machine/md_var.h> 78 #endif 79 80 #include <security/audit/audit.h> 81 #include <security/mac/mac_framework.h> 82 83 #include <vm/vm.h> 84 #include <vm/vm_param.h> 85 #include <vm/pmap.h> 86 #include <vm/vm_map.h> 87 #include <vm/vm_object.h> 88 #include <vm/vm_page.h> 89 #include <vm/vm_pager.h> 90 #include <vm/vm_pageout.h> 91 #include <vm/vm_extern.h> 92 #include <vm/vm_page.h> 93 #include <vm/vnode_pager.h> 94 95 #ifdef HWPMC_HOOKS 96 #include <sys/pmckern.h> 97 #endif 98 99 #ifdef HWT_HOOKS 100 #include <dev/hwt/hwt_hook.h> 101 #endif 102 103 int old_mlock = 0; 104 SYSCTL_INT(_vm, OID_AUTO, old_mlock, CTLFLAG_RWTUN, &old_mlock, 0, 105 "Do not apply RLIMIT_MEMLOCK on mlockall"); 106 static int mincore_mapped = 1; 107 SYSCTL_INT(_vm, OID_AUTO, mincore_mapped, CTLFLAG_RWTUN, &mincore_mapped, 0, 108 "mincore reports mappings, not residency"); 109 static int imply_prot_max = 0; 110 SYSCTL_INT(_vm, OID_AUTO, imply_prot_max, CTLFLAG_RWTUN, &imply_prot_max, 0, 111 "Imply maximum page protections in mmap() when none are specified"); 112 113 _Static_assert(MAXPAGESIZES <= 4, "MINCORE_SUPER too narrow"); 114 115 #if defined(COMPAT_43) 116 int 117 ogetpagesize(struct thread *td, struct ogetpagesize_args *uap) 118 { 119 120 td->td_retval[0] = PAGE_SIZE; 121 return (0); 122 } 123 #endif /* COMPAT_43 */ 124 125 /* 126 * Memory Map (mmap) system call. Note that the file offset 127 * and address are allowed to be NOT page aligned, though if 128 * the MAP_FIXED flag it set, both must have the same remainder 129 * modulo the PAGE_SIZE (POSIX 1003.1b). If the address is not 130 * page-aligned, the actual mapping starts at trunc_page(addr) 131 * and the return value is adjusted up by the page offset. 132 * 133 * Generally speaking, only character devices which are themselves 134 * memory-based, such as a video framebuffer, can be mmap'd. Otherwise 135 * there would be no cache coherency between a descriptor and a VM mapping 136 * both to the same character device. 137 */ 138 #ifndef _SYS_SYSPROTO_H_ 139 struct mmap_args { 140 void *addr; 141 size_t len; 142 int prot; 143 int flags; 144 int fd; 145 long pad; 146 off_t pos; 147 }; 148 #endif 149 150 int 151 sys_mmap(struct thread *td, struct mmap_args *uap) 152 { 153 154 return (kern_mmap(td, &(struct mmap_req){ 155 .mr_hint = (uintptr_t)uap->addr, 156 .mr_len = uap->len, 157 .mr_prot = uap->prot, 158 .mr_flags = uap->flags, 159 .mr_fd = uap->fd, 160 .mr_pos = uap->pos, 161 })); 162 } 163 164 int 165 kern_mmap_maxprot(struct proc *p, int prot) 166 { 167 168 if ((p->p_flag2 & P2_PROTMAX_DISABLE) != 0 || 169 (p->p_fctl0 & NT_FREEBSD_FCTL_PROTMAX_DISABLE) != 0) 170 return (_PROT_ALL); 171 if (((p->p_flag2 & P2_PROTMAX_ENABLE) != 0 || imply_prot_max) && 172 prot != PROT_NONE) 173 return (prot); 174 return (_PROT_ALL); 175 } 176 177 int 178 kern_mmap(struct thread *td, const struct mmap_req *mrp) 179 { 180 struct vmspace *vms; 181 struct file *fp; 182 struct proc *p; 183 off_t pos; 184 vm_offset_t addr, orig_addr; 185 vm_size_t len, pageoff, size; 186 vm_prot_t cap_maxprot; 187 int align, error, fd, flags, max_prot, prot; 188 cap_rights_t rights; 189 mmap_check_fp_fn check_fp_fn; 190 191 orig_addr = addr = mrp->mr_hint; 192 len = mrp->mr_len; 193 prot = mrp->mr_prot; 194 flags = mrp->mr_flags; 195 fd = mrp->mr_fd; 196 pos = mrp->mr_pos; 197 check_fp_fn = mrp->mr_check_fp_fn; 198 199 if ((prot & ~(_PROT_ALL | PROT_MAX(_PROT_ALL))) != 0) { 200 return (EXTERROR(EINVAL, "unknown PROT bits %#jx", prot)); 201 } 202 max_prot = PROT_MAX_EXTRACT(prot); 203 prot = PROT_EXTRACT(prot); 204 if (max_prot != 0 && (max_prot & prot) != prot) { 205 return (EXTERROR(ENOTSUP, 206 "prot %#jx is not subset of max_prot %#jx", 207 prot, max_prot)); 208 } 209 210 p = td->td_proc; 211 212 /* 213 * Always honor PROT_MAX if set. If not, default to all 214 * permissions unless we're implying maximum permissions. 215 */ 216 if (max_prot == 0) 217 max_prot = kern_mmap_maxprot(p, prot); 218 219 vms = p->p_vmspace; 220 fp = NULL; 221 AUDIT_ARG_FD(fd); 222 223 /* 224 * Ignore old flags that used to be defined but did not do anything. 225 */ 226 flags &= ~(MAP_RESERVED0020 | MAP_RESERVED0040); 227 228 /* 229 * Enforce the constraints. 230 * Mapping of length 0 is only allowed for old binaries. 231 * Anonymous mapping shall specify -1 as filedescriptor and 232 * zero position for new code. Be nice to ancient a.out 233 * binaries and correct pos for anonymous mapping, since old 234 * ld.so sometimes issues anonymous map requests with non-zero 235 * pos. 236 */ 237 if (!SV_CURPROC_FLAG(SV_AOUT)) { 238 if ((len == 0 && p->p_osrel >= P_OSREL_MAP_ANON) || 239 ((flags & MAP_ANON) != 0 && (fd != -1 || pos != 0))) { 240 return (EXTERROR(EINVAL, 241 "offset %#jd not zero/fd %#jd not -1 for MAP_ANON", 242 fd, pos)); 243 } 244 } else { 245 if ((flags & MAP_ANON) != 0) 246 pos = 0; 247 } 248 249 if (flags & MAP_STACK) { 250 if ((fd != -1) || ((prot & (PROT_READ | PROT_WRITE)) != 251 (PROT_READ | PROT_WRITE))) { 252 return (EXTERROR(EINVAL, 253 "MAP_STACK with prot %#jx < rw", prot)); 254 } 255 flags |= MAP_ANON; 256 pos = 0; 257 } 258 if ((flags & ~(MAP_SHARED | MAP_PRIVATE | MAP_FIXED | MAP_HASSEMAPHORE | 259 MAP_STACK | MAP_NOSYNC | MAP_ANON | MAP_EXCL | MAP_NOCORE | 260 MAP_PREFAULT_READ | MAP_GUARD | MAP_32BIT | 261 MAP_ALIGNMENT_MASK)) != 0) { 262 return (EXTERROR(EINVAL, "reserved flag set (flags %#jx)", 263 flags)); 264 } 265 if ((flags & (MAP_EXCL | MAP_FIXED)) == MAP_EXCL) { 266 return (EXTERROR(EINVAL, "EXCL without FIXED (flags %#jx)", 267 flags)); 268 } 269 if ((flags & (MAP_SHARED | MAP_PRIVATE)) == (MAP_SHARED | 270 MAP_PRIVATE)) { 271 return (EXTERROR(EINVAL, 272 "both SHARED and PRIVATE set (flags %#jx)", flags)); 273 } 274 if (prot != PROT_NONE && 275 (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) != 0) { 276 return (EXTERROR(EINVAL, "invalid prot %#jx", prot)); 277 } 278 if ((flags & MAP_GUARD) != 0 && (prot != PROT_NONE || fd != -1 || 279 pos != 0 || (flags & ~(MAP_FIXED | MAP_GUARD | MAP_EXCL | 280 MAP_32BIT | MAP_ALIGNMENT_MASK)) != 0)) { 281 return (EXTERROR(EINVAL, "GUARD with wrong parameters")); 282 } 283 284 /* 285 * Align the file position to a page boundary, 286 * and save its page offset component. 287 */ 288 pageoff = (pos & PAGE_MASK); 289 pos -= pageoff; 290 291 /* Compute size from len by rounding (on both ends). */ 292 size = len + pageoff; /* low end... */ 293 size = round_page(size); /* hi end */ 294 /* Check for rounding up to zero. */ 295 if (len > size) 296 return (ENOMEM); 297 298 /* Ensure alignment is at least a page and fits in a pointer. */ 299 align = flags & MAP_ALIGNMENT_MASK; 300 if (align != 0 && align != MAP_ALIGNED_SUPER && 301 (align >> MAP_ALIGNMENT_SHIFT >= sizeof(void *) * NBBY || 302 align >> MAP_ALIGNMENT_SHIFT < PAGE_SHIFT)) { 303 return (EXTERROR(EINVAL, "bad alignment %#jx", align)); 304 } 305 306 /* 307 * Check for illegal addresses. Watch out for address wrap... Note 308 * that VM_*_ADDRESS are not constants due to casts (argh). 309 */ 310 if (flags & MAP_FIXED) { 311 /* 312 * The specified address must have the same remainder 313 * as the file offset taken modulo PAGE_SIZE, so it 314 * should be aligned after adjustment by pageoff. 315 */ 316 addr -= pageoff; 317 if ((addr & PAGE_MASK) != 0) { 318 return (EXTERROR(EINVAL, 319 "fixed mapping at %#jx not aligned", addr)); 320 } 321 322 /* Address range must be all in user VM space. */ 323 if (!vm_map_range_valid(&vms->vm_map, addr, addr + size)) { 324 EXTERROR(EINVAL, "mapping outside vm_map"); 325 return (EINVAL); 326 } 327 if (flags & MAP_32BIT && addr + size > MAP_32BIT_MAX_ADDR) { 328 return (EXTERROR(EINVAL, 329 "fixed 32bit mapping of [%#jx %#jx] does not fit into 4G", 330 addr, addr + size)); 331 } 332 } else if (flags & MAP_32BIT) { 333 /* 334 * For MAP_32BIT, override the hint if it is too high and 335 * do not bother moving the mapping past the heap (since 336 * the heap is usually above 2GB). 337 */ 338 if (addr + size > MAP_32BIT_MAX_ADDR) 339 addr = 0; 340 } else { 341 /* 342 * XXX for non-fixed mappings where no hint is provided or 343 * the hint would fall in the potential heap space, 344 * place it after the end of the largest possible heap. 345 * 346 * For anonymous mappings within the address space of the 347 * calling process, the absence of a hint is handled at a 348 * lower level in order to implement different clustering 349 * strategies for ASLR. 350 */ 351 if (((flags & MAP_ANON) == 0 && addr == 0) || 352 (addr >= round_page((vm_offset_t)vms->vm_taddr) && 353 addr < round_page((vm_offset_t)vms->vm_daddr + 354 lim_max(td, RLIMIT_DATA)))) 355 addr = round_page((vm_offset_t)vms->vm_daddr + 356 lim_max(td, RLIMIT_DATA)); 357 } 358 if (len == 0) { 359 /* 360 * Return success without mapping anything for old 361 * binaries that request a page-aligned mapping of 362 * length 0. For modern binaries, this function 363 * returns an error earlier. 364 */ 365 error = 0; 366 } else if ((flags & MAP_GUARD) != 0) { 367 error = vm_mmap_object(&vms->vm_map, &addr, size, VM_PROT_NONE, 368 VM_PROT_NONE, flags, NULL, pos, FALSE, td); 369 } else if ((flags & MAP_ANON) != 0) { 370 /* 371 * Mapping blank space is trivial. 372 * 373 * This relies on VM_PROT_* matching PROT_*. 374 */ 375 error = vm_mmap_object(&vms->vm_map, &addr, size, prot, 376 max_prot, flags, NULL, pos, FALSE, td); 377 } else { 378 /* 379 * Mapping file, get fp for validation and don't let the 380 * descriptor disappear on us if we block. Check capability 381 * rights, but also return the maximum rights to be combined 382 * with maxprot later. 383 */ 384 cap_rights_init_one(&rights, CAP_MMAP); 385 if (prot & PROT_READ) 386 cap_rights_set_one(&rights, CAP_MMAP_R); 387 if ((flags & MAP_SHARED) != 0) { 388 if (prot & PROT_WRITE) 389 cap_rights_set_one(&rights, CAP_MMAP_W); 390 } 391 if (prot & PROT_EXEC) 392 cap_rights_set_one(&rights, CAP_MMAP_X); 393 error = fget_mmap(td, fd, &rights, &cap_maxprot, &fp); 394 if (error != 0) 395 goto done; 396 if ((flags & (MAP_SHARED | MAP_PRIVATE)) == 0 && 397 p->p_osrel >= P_OSREL_MAP_FSTRICT) { 398 EXTERROR(EINVAL, "neither SHARED nor PRIVATE req"); 399 error = EINVAL; 400 goto done; 401 } 402 if (check_fp_fn != NULL) { 403 error = check_fp_fn(fp, prot, max_prot & cap_maxprot, 404 flags); 405 if (error != 0) 406 goto done; 407 } 408 if (fp->f_ops == &shm_ops && shm_largepage(fp->f_data)) 409 addr = orig_addr; 410 /* This relies on VM_PROT_* matching PROT_*. */ 411 error = fo_mmap(fp, &vms->vm_map, &addr, size, prot, 412 max_prot & cap_maxprot, flags, pos, td); 413 } 414 415 if (error == 0) 416 td->td_retval[0] = addr + pageoff; 417 done: 418 if (fp) 419 fdrop(fp, td); 420 421 return (error); 422 } 423 424 #if defined(COMPAT_FREEBSD6) 425 int 426 freebsd6_mmap(struct thread *td, struct freebsd6_mmap_args *uap) 427 { 428 return (kern_mmap(td, &(struct mmap_req){ 429 .mr_hint = (uintptr_t)uap->addr, 430 .mr_len = uap->len, 431 .mr_prot = uap->prot, 432 .mr_flags = uap->flags, 433 .mr_fd = uap->fd, 434 .mr_pos = uap->pos, 435 })); 436 } 437 #endif 438 439 #ifdef COMPAT_43 440 #ifndef _SYS_SYSPROTO_H_ 441 struct ommap_args { 442 caddr_t addr; 443 int len; 444 int prot; 445 int flags; 446 int fd; 447 long pos; 448 }; 449 #endif 450 int 451 ommap(struct thread *td, struct ommap_args *uap) 452 { 453 return (kern_ommap(td, (uintptr_t)uap->addr, uap->len, uap->prot, 454 uap->flags, uap->fd, uap->pos)); 455 } 456 457 int 458 kern_ommap(struct thread *td, uintptr_t hint, int len, int oprot, 459 int oflags, int fd, long pos) 460 { 461 static const char cvtbsdprot[8] = { 462 0, 463 PROT_EXEC, 464 PROT_WRITE, 465 PROT_EXEC | PROT_WRITE, 466 PROT_READ, 467 PROT_EXEC | PROT_READ, 468 PROT_WRITE | PROT_READ, 469 PROT_EXEC | PROT_WRITE | PROT_READ, 470 }; 471 int flags, prot; 472 473 if (len < 0) 474 return (EINVAL); 475 476 #define OMAP_ANON 0x0002 477 #define OMAP_COPY 0x0020 478 #define OMAP_SHARED 0x0010 479 #define OMAP_FIXED 0x0100 480 481 prot = cvtbsdprot[oprot & 0x7]; 482 #if (defined(COMPAT_FREEBSD32) && defined(__amd64__)) || defined(__i386__) 483 if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32) && 484 prot != 0) 485 prot |= PROT_EXEC; 486 #endif 487 flags = 0; 488 if (oflags & OMAP_ANON) 489 flags |= MAP_ANON; 490 if (oflags & OMAP_COPY) 491 flags |= MAP_COPY; 492 if (oflags & OMAP_SHARED) 493 flags |= MAP_SHARED; 494 else 495 flags |= MAP_PRIVATE; 496 if (oflags & OMAP_FIXED) 497 flags |= MAP_FIXED; 498 return (kern_mmap(td, &(struct mmap_req){ 499 .mr_hint = hint, 500 .mr_len = len, 501 .mr_prot = prot, 502 .mr_flags = flags, 503 .mr_fd = fd, 504 .mr_pos = pos, 505 })); 506 } 507 #endif /* COMPAT_43 */ 508 509 #ifndef _SYS_SYSPROTO_H_ 510 struct msync_args { 511 void *addr; 512 size_t len; 513 int flags; 514 }; 515 #endif 516 int 517 sys_msync(struct thread *td, struct msync_args *uap) 518 { 519 520 return (kern_msync(td, (uintptr_t)uap->addr, uap->len, uap->flags)); 521 } 522 523 int 524 kern_msync(struct thread *td, uintptr_t addr0, size_t size, int flags) 525 { 526 vm_offset_t addr; 527 vm_size_t pageoff; 528 vm_map_t map; 529 int rv; 530 531 addr = addr0; 532 pageoff = (addr & PAGE_MASK); 533 addr -= pageoff; 534 size += pageoff; 535 size = (vm_size_t) round_page(size); 536 if (addr + size < addr) 537 return (EINVAL); 538 539 if ((flags & (MS_ASYNC|MS_INVALIDATE)) == (MS_ASYNC|MS_INVALIDATE)) 540 return (EINVAL); 541 542 map = &td->td_proc->p_vmspace->vm_map; 543 544 /* 545 * Clean the pages and interpret the return value. 546 */ 547 rv = vm_map_sync(map, addr, addr + size, (flags & MS_ASYNC) == 0, 548 (flags & MS_INVALIDATE) != 0); 549 switch (rv) { 550 case KERN_SUCCESS: 551 return (0); 552 case KERN_INVALID_ADDRESS: 553 return (ENOMEM); 554 case KERN_INVALID_ARGUMENT: 555 return (EBUSY); 556 case KERN_FAILURE: 557 return (EIO); 558 default: 559 return (EINVAL); 560 } 561 } 562 563 #ifndef _SYS_SYSPROTO_H_ 564 struct munmap_args { 565 void *addr; 566 size_t len; 567 }; 568 #endif 569 int 570 sys_munmap(struct thread *td, struct munmap_args *uap) 571 { 572 573 return (kern_munmap(td, (uintptr_t)uap->addr, uap->len)); 574 } 575 576 int 577 kern_munmap(struct thread *td, uintptr_t addr0, size_t size) 578 { 579 #ifdef HWPMC_HOOKS 580 struct pmckern_map_out pkm; 581 vm_map_entry_t entry; 582 bool pmc_handled; 583 #endif 584 vm_offset_t addr, end; 585 vm_size_t pageoff; 586 vm_map_t map; 587 int rv; 588 589 if (size == 0) 590 return (EINVAL); 591 592 addr = addr0; 593 pageoff = (addr & PAGE_MASK); 594 addr -= pageoff; 595 size += pageoff; 596 size = (vm_size_t) round_page(size); 597 end = addr + size; 598 map = &td->td_proc->p_vmspace->vm_map; 599 if (!vm_map_range_valid(map, addr, end)) 600 return (EINVAL); 601 602 vm_map_lock(map); 603 #ifdef HWPMC_HOOKS 604 pmc_handled = false; 605 if (PMC_HOOK_INSTALLED(PMC_FN_MUNMAP)) { 606 pmc_handled = true; 607 /* 608 * Inform hwpmc if the address range being unmapped contains 609 * an executable region. 610 */ 611 pkm.pm_address = (uintptr_t) NULL; 612 if (vm_map_lookup_entry(map, addr, &entry)) { 613 for (; entry->start < end; 614 entry = vm_map_entry_succ(entry)) { 615 if (vm_map_check_protection(map, entry->start, 616 entry->end, VM_PROT_EXECUTE) == TRUE) { 617 pkm.pm_address = (uintptr_t) addr; 618 pkm.pm_size = (size_t) size; 619 break; 620 } 621 } 622 } 623 } 624 #endif 625 rv = vm_map_delete(map, addr, end); 626 627 #ifdef HWT_HOOKS 628 if (HWT_HOOK_INSTALLED && rv == KERN_SUCCESS) { 629 struct hwt_record_entry ent; 630 631 ent.addr = (uintptr_t) addr; 632 ent.fullpath = NULL; 633 ent.record_type = HWT_RECORD_MUNMAP; 634 HWT_CALL_HOOK(td, HWT_RECORD, &ent); 635 } 636 #endif 637 638 #ifdef HWPMC_HOOKS 639 if (rv == KERN_SUCCESS && __predict_false(pmc_handled)) { 640 /* downgrade the lock to prevent a LOR with the pmc-sx lock */ 641 vm_map_lock_downgrade(map); 642 if (pkm.pm_address != (uintptr_t) NULL) 643 PMC_CALL_HOOK(td, PMC_FN_MUNMAP, (void *) &pkm); 644 vm_map_unlock_read(map); 645 } else 646 #endif 647 vm_map_unlock(map); 648 649 return (vm_mmap_to_errno(rv)); 650 } 651 652 #ifndef _SYS_SYSPROTO_H_ 653 struct mprotect_args { 654 const void *addr; 655 size_t len; 656 int prot; 657 }; 658 #endif 659 int 660 sys_mprotect(struct thread *td, struct mprotect_args *uap) 661 { 662 663 return (kern_mprotect(td, (uintptr_t)uap->addr, uap->len, 664 uap->prot, 0)); 665 } 666 667 int 668 kern_mprotect(struct thread *td, uintptr_t addr0, size_t size, int prot, 669 int flags) 670 { 671 vm_offset_t addr; 672 vm_size_t pageoff; 673 int vm_error, max_prot; 674 675 addr = addr0; 676 if ((prot & ~(_PROT_ALL | PROT_MAX(_PROT_ALL))) != 0) 677 return (EINVAL); 678 max_prot = PROT_MAX_EXTRACT(prot); 679 prot = PROT_EXTRACT(prot); 680 pageoff = (addr & PAGE_MASK); 681 addr -= pageoff; 682 size += pageoff; 683 size = (vm_size_t) round_page(size); 684 #ifdef COMPAT_FREEBSD32 685 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 686 if (((addr + size) & 0xffffffff) < addr) 687 return (EINVAL); 688 } else 689 #endif 690 if (addr + size < addr) 691 return (EINVAL); 692 693 flags |= VM_MAP_PROTECT_SET_PROT; 694 if (max_prot != 0) 695 flags |= VM_MAP_PROTECT_SET_MAXPROT; 696 vm_error = vm_map_protect(&td->td_proc->p_vmspace->vm_map, 697 addr, addr + size, prot, max_prot, flags); 698 699 switch (vm_error) { 700 case KERN_SUCCESS: 701 return (0); 702 case KERN_PROTECTION_FAILURE: 703 return (EACCES); 704 case KERN_RESOURCE_SHORTAGE: 705 return (ENOMEM); 706 case KERN_OUT_OF_BOUNDS: 707 return (ENOTSUP); 708 } 709 return (EINVAL); 710 } 711 712 #ifndef _SYS_SYSPROTO_H_ 713 struct minherit_args { 714 void *addr; 715 size_t len; 716 int inherit; 717 }; 718 #endif 719 int 720 sys_minherit(struct thread *td, struct minherit_args *uap) 721 { 722 723 return (kern_minherit(td, (uintptr_t)uap->addr, uap->len, 724 uap->inherit)); 725 } 726 727 int 728 kern_minherit(struct thread *td, uintptr_t addr0, size_t len, int inherit0) 729 { 730 vm_offset_t addr; 731 vm_size_t size, pageoff; 732 vm_inherit_t inherit; 733 734 addr = (vm_offset_t)addr0; 735 size = len; 736 inherit = inherit0; 737 738 pageoff = (addr & PAGE_MASK); 739 addr -= pageoff; 740 size += pageoff; 741 size = (vm_size_t) round_page(size); 742 if (addr + size < addr) 743 return (EINVAL); 744 745 switch (vm_map_inherit(&td->td_proc->p_vmspace->vm_map, addr, 746 addr + size, inherit)) { 747 case KERN_SUCCESS: 748 return (0); 749 case KERN_PROTECTION_FAILURE: 750 return (EACCES); 751 } 752 return (EINVAL); 753 } 754 755 #ifndef _SYS_SYSPROTO_H_ 756 struct madvise_args { 757 void *addr; 758 size_t len; 759 int behav; 760 }; 761 #endif 762 763 int 764 sys_madvise(struct thread *td, struct madvise_args *uap) 765 { 766 767 return (kern_madvise(td, (uintptr_t)uap->addr, uap->len, uap->behav)); 768 } 769 770 int 771 kern_madvise(struct thread *td, uintptr_t addr0, size_t len, int behav) 772 { 773 vm_map_t map; 774 vm_offset_t addr, end, start; 775 int flags; 776 777 /* 778 * Check for our special case, advising the swap pager we are 779 * "immortal." 780 */ 781 if (behav == MADV_PROTECT) { 782 flags = PPROT_SET; 783 return (kern_procctl(td, P_PID, td->td_proc->p_pid, 784 PROC_SPROTECT, &flags)); 785 } 786 787 /* 788 * Check for illegal addresses. Watch out for address wrap... Note 789 * that VM_*_ADDRESS are not constants due to casts (argh). 790 */ 791 map = &td->td_proc->p_vmspace->vm_map; 792 addr = addr0; 793 if (!vm_map_range_valid(map, addr, addr + len)) 794 return (EINVAL); 795 796 /* 797 * Since this routine is only advisory, we default to conservative 798 * behavior. 799 */ 800 start = trunc_page(addr); 801 end = round_page(addr + len); 802 803 /* 804 * vm_map_madvise() checks for illegal values of behav. 805 */ 806 return (vm_map_madvise(map, start, end, behav)); 807 } 808 809 #ifndef _SYS_SYSPROTO_H_ 810 struct mincore_args { 811 const void *addr; 812 size_t len; 813 char *vec; 814 }; 815 #endif 816 817 int 818 sys_mincore(struct thread *td, struct mincore_args *uap) 819 { 820 821 return (kern_mincore(td, (uintptr_t)uap->addr, uap->len, uap->vec)); 822 } 823 824 int 825 kern_mincore(struct thread *td, uintptr_t addr0, size_t len, char *vec) 826 { 827 pmap_t pmap; 828 vm_map_t map; 829 vm_map_entry_t current, entry; 830 vm_object_t object; 831 vm_offset_t addr, cend, end, first_addr; 832 vm_paddr_t pa; 833 vm_page_t m; 834 vm_pindex_t pindex; 835 int error, lastvecindex, mincoreinfo, vecindex; 836 unsigned int timestamp; 837 838 /* 839 * Make sure that the addresses presented are valid for user 840 * mode. 841 */ 842 first_addr = addr = trunc_page(addr0); 843 end = round_page(addr0 + len); 844 map = &td->td_proc->p_vmspace->vm_map; 845 if (end > vm_map_max(map) || end < addr) 846 return (ENOMEM); 847 848 pmap = vmspace_pmap(td->td_proc->p_vmspace); 849 850 vm_map_lock_read(map); 851 RestartScan: 852 timestamp = map->timestamp; 853 854 if (!vm_map_lookup_entry(map, addr, &entry)) { 855 vm_map_unlock_read(map); 856 return (ENOMEM); 857 } 858 859 /* 860 * Do this on a map entry basis so that if the pages are not 861 * in the current processes address space, we can easily look 862 * up the pages elsewhere. 863 */ 864 lastvecindex = -1; 865 while (entry->start < end) { 866 /* 867 * check for contiguity 868 */ 869 current = entry; 870 entry = vm_map_entry_succ(current); 871 if (current->end < end && 872 entry->start > current->end) { 873 vm_map_unlock_read(map); 874 return (ENOMEM); 875 } 876 877 /* 878 * ignore submaps (for now) or null objects 879 */ 880 if ((current->eflags & MAP_ENTRY_IS_SUB_MAP) || 881 current->object.vm_object == NULL) 882 continue; 883 884 /* 885 * limit this scan to the current map entry and the 886 * limits for the mincore call 887 */ 888 if (addr < current->start) 889 addr = current->start; 890 cend = current->end; 891 if (cend > end) 892 cend = end; 893 894 for (; addr < cend; addr += PAGE_SIZE) { 895 /* 896 * Check pmap first, it is likely faster, also 897 * it can provide info as to whether we are the 898 * one referencing or modifying the page. 899 */ 900 m = NULL; 901 object = NULL; 902 retry: 903 pa = 0; 904 mincoreinfo = pmap_mincore(pmap, addr, &pa); 905 if (mincore_mapped) { 906 /* 907 * We only care about this pmap's 908 * mapping of the page, if any. 909 */ 910 ; 911 } else if (pa != 0) { 912 /* 913 * The page is mapped by this process but not 914 * both accessed and modified. It is also 915 * managed. Acquire the object lock so that 916 * other mappings might be examined. The page's 917 * identity may change at any point before its 918 * object lock is acquired, so re-validate if 919 * necessary. 920 */ 921 m = PHYS_TO_VM_PAGE(pa); 922 while (object == NULL || m->object != object) { 923 if (object != NULL) 924 VM_OBJECT_WUNLOCK(object); 925 object = atomic_load_ptr(&m->object); 926 if (object == NULL) 927 goto retry; 928 VM_OBJECT_WLOCK(object); 929 } 930 if (pa != pmap_extract(pmap, addr)) 931 goto retry; 932 KASSERT(vm_page_all_valid(m), 933 ("mincore: page %p is mapped but invalid", 934 m)); 935 } else if (mincoreinfo == 0) { 936 /* 937 * The page is not mapped by this process. If 938 * the object implements managed pages, then 939 * determine if the page is resident so that 940 * the mappings might be examined. 941 */ 942 if (current->object.vm_object != object) { 943 if (object != NULL) 944 VM_OBJECT_WUNLOCK(object); 945 object = current->object.vm_object; 946 VM_OBJECT_WLOCK(object); 947 } 948 if ((object->flags & OBJ_SWAP) != 0 || 949 object->type == OBJT_VNODE) { 950 pindex = OFF_TO_IDX(current->offset + 951 (addr - current->start)); 952 m = vm_page_lookup(object, pindex); 953 if (m != NULL && vm_page_none_valid(m)) 954 m = NULL; 955 if (m != NULL) 956 mincoreinfo = MINCORE_INCORE; 957 } 958 } 959 if (m != NULL) { 960 VM_OBJECT_ASSERT_WLOCKED(m->object); 961 962 /* Examine other mappings of the page. */ 963 if (m->dirty == 0 && pmap_is_modified(m)) 964 vm_page_dirty(m); 965 if (m->dirty != 0) 966 mincoreinfo |= MINCORE_MODIFIED_OTHER; 967 968 /* 969 * The first test for PGA_REFERENCED is an 970 * optimization. The second test is 971 * required because a concurrent pmap 972 * operation could clear the last reference 973 * and set PGA_REFERENCED before the call to 974 * pmap_is_referenced(). 975 */ 976 if ((m->a.flags & PGA_REFERENCED) != 0 || 977 pmap_is_referenced(m) || 978 (m->a.flags & PGA_REFERENCED) != 0) 979 mincoreinfo |= MINCORE_REFERENCED_OTHER; 980 } 981 if (object != NULL) 982 VM_OBJECT_WUNLOCK(object); 983 984 /* 985 * subyte may page fault. In case it needs to modify 986 * the map, we release the lock. 987 */ 988 vm_map_unlock_read(map); 989 990 /* 991 * calculate index into user supplied byte vector 992 */ 993 vecindex = atop(addr - first_addr); 994 995 /* 996 * If we have skipped map entries, we need to make sure that 997 * the byte vector is zeroed for those skipped entries. 998 */ 999 while ((lastvecindex + 1) < vecindex) { 1000 ++lastvecindex; 1001 error = subyte(vec + lastvecindex, 0); 1002 if (error) { 1003 error = EFAULT; 1004 goto done2; 1005 } 1006 } 1007 1008 /* 1009 * Pass the page information to the user 1010 */ 1011 error = subyte(vec + vecindex, mincoreinfo); 1012 if (error) { 1013 error = EFAULT; 1014 goto done2; 1015 } 1016 1017 /* 1018 * If the map has changed, due to the subyte, the previous 1019 * output may be invalid. 1020 */ 1021 vm_map_lock_read(map); 1022 if (timestamp != map->timestamp) 1023 goto RestartScan; 1024 1025 lastvecindex = vecindex; 1026 } 1027 } 1028 1029 /* 1030 * subyte may page fault. In case it needs to modify 1031 * the map, we release the lock. 1032 */ 1033 vm_map_unlock_read(map); 1034 1035 /* 1036 * Zero the last entries in the byte vector. 1037 */ 1038 vecindex = atop(end - first_addr); 1039 while ((lastvecindex + 1) < vecindex) { 1040 ++lastvecindex; 1041 error = subyte(vec + lastvecindex, 0); 1042 if (error) { 1043 error = EFAULT; 1044 goto done2; 1045 } 1046 } 1047 1048 /* 1049 * If the map has changed, due to the subyte, the previous 1050 * output may be invalid. 1051 */ 1052 vm_map_lock_read(map); 1053 if (timestamp != map->timestamp) 1054 goto RestartScan; 1055 vm_map_unlock_read(map); 1056 done2: 1057 return (error); 1058 } 1059 1060 #ifndef _SYS_SYSPROTO_H_ 1061 struct mlock_args { 1062 const void *addr; 1063 size_t len; 1064 }; 1065 #endif 1066 int 1067 sys_mlock(struct thread *td, struct mlock_args *uap) 1068 { 1069 1070 return (kern_mlock(td->td_proc, td->td_ucred, 1071 __DECONST(uintptr_t, uap->addr), uap->len)); 1072 } 1073 1074 int 1075 kern_mlock(struct proc *proc, struct ucred *cred, uintptr_t addr0, size_t len) 1076 { 1077 vm_offset_t addr, end, last, start; 1078 vm_size_t npages, size; 1079 vm_map_t map; 1080 unsigned long nsize; 1081 int error; 1082 1083 error = priv_check_cred(cred, PRIV_VM_MLOCK); 1084 if (error) 1085 return (error); 1086 addr = addr0; 1087 size = len; 1088 last = addr + size; 1089 start = trunc_page(addr); 1090 end = round_page(last); 1091 if (last < addr || end < addr) 1092 return (EINVAL); 1093 npages = atop(end - start); 1094 if (npages > vm_page_max_user_wired) 1095 return (ENOMEM); 1096 map = &proc->p_vmspace->vm_map; 1097 PROC_LOCK(proc); 1098 nsize = ptoa(npages + pmap_wired_count(map->pmap)); 1099 if (nsize > lim_cur_proc(proc, RLIMIT_MEMLOCK)) { 1100 PROC_UNLOCK(proc); 1101 return (ENOMEM); 1102 } 1103 PROC_UNLOCK(proc); 1104 #ifdef RACCT 1105 if (racct_enable) { 1106 PROC_LOCK(proc); 1107 error = racct_set(proc, RACCT_MEMLOCK, nsize); 1108 PROC_UNLOCK(proc); 1109 if (error != 0) 1110 return (ENOMEM); 1111 } 1112 #endif 1113 error = vm_map_wire(map, start, end, 1114 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES); 1115 #ifdef RACCT 1116 if (racct_enable && error != KERN_SUCCESS) { 1117 PROC_LOCK(proc); 1118 racct_set(proc, RACCT_MEMLOCK, 1119 ptoa(pmap_wired_count(map->pmap))); 1120 PROC_UNLOCK(proc); 1121 } 1122 #endif 1123 switch (error) { 1124 case KERN_SUCCESS: 1125 return (0); 1126 case KERN_INVALID_ARGUMENT: 1127 return (EINVAL); 1128 default: 1129 return (ENOMEM); 1130 } 1131 } 1132 1133 #ifndef _SYS_SYSPROTO_H_ 1134 struct mlockall_args { 1135 int how; 1136 }; 1137 #endif 1138 1139 int 1140 sys_mlockall(struct thread *td, struct mlockall_args *uap) 1141 { 1142 vm_map_t map; 1143 int error; 1144 1145 map = &td->td_proc->p_vmspace->vm_map; 1146 error = priv_check(td, PRIV_VM_MLOCK); 1147 if (error) 1148 return (error); 1149 1150 if ((uap->how == 0) || ((uap->how & ~(MCL_CURRENT|MCL_FUTURE)) != 0)) 1151 return (EINVAL); 1152 1153 /* 1154 * If wiring all pages in the process would cause it to exceed 1155 * a hard resource limit, return ENOMEM. 1156 */ 1157 if (!old_mlock && uap->how & MCL_CURRENT) { 1158 if (map->size > lim_cur(td, RLIMIT_MEMLOCK)) 1159 return (ENOMEM); 1160 } 1161 #ifdef RACCT 1162 if (racct_enable) { 1163 PROC_LOCK(td->td_proc); 1164 error = racct_set(td->td_proc, RACCT_MEMLOCK, map->size); 1165 PROC_UNLOCK(td->td_proc); 1166 if (error != 0) 1167 return (ENOMEM); 1168 } 1169 #endif 1170 1171 if (uap->how & MCL_FUTURE) { 1172 vm_map_lock(map); 1173 vm_map_modflags(map, MAP_WIREFUTURE, 0); 1174 vm_map_unlock(map); 1175 error = 0; 1176 } 1177 1178 if (uap->how & MCL_CURRENT) { 1179 /* 1180 * P1003.1-2001 mandates that all currently mapped pages 1181 * will be memory resident and locked (wired) upon return 1182 * from mlockall(). vm_map_wire() will wire pages, by 1183 * calling vm_fault_wire() for each page in the region. 1184 */ 1185 error = vm_map_wire(map, vm_map_min(map), vm_map_max(map), 1186 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK); 1187 if (error == KERN_SUCCESS) 1188 error = 0; 1189 else if (error == KERN_RESOURCE_SHORTAGE) 1190 error = ENOMEM; 1191 else 1192 error = EAGAIN; 1193 } 1194 #ifdef RACCT 1195 if (racct_enable && error != KERN_SUCCESS) { 1196 PROC_LOCK(td->td_proc); 1197 racct_set(td->td_proc, RACCT_MEMLOCK, 1198 ptoa(pmap_wired_count(map->pmap))); 1199 PROC_UNLOCK(td->td_proc); 1200 } 1201 #endif 1202 1203 return (error); 1204 } 1205 1206 #ifndef _SYS_SYSPROTO_H_ 1207 struct munlockall_args { 1208 register_t dummy; 1209 }; 1210 #endif 1211 1212 int 1213 sys_munlockall(struct thread *td, struct munlockall_args *uap) 1214 { 1215 vm_map_t map; 1216 int error; 1217 1218 map = &td->td_proc->p_vmspace->vm_map; 1219 error = priv_check(td, PRIV_VM_MUNLOCK); 1220 if (error) 1221 return (error); 1222 1223 /* Clear the MAP_WIREFUTURE flag from this vm_map. */ 1224 vm_map_lock(map); 1225 vm_map_modflags(map, 0, MAP_WIREFUTURE); 1226 vm_map_unlock(map); 1227 1228 /* Forcibly unwire all pages. */ 1229 error = vm_map_unwire(map, vm_map_min(map), vm_map_max(map), 1230 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK); 1231 #ifdef RACCT 1232 if (racct_enable && error == KERN_SUCCESS) { 1233 PROC_LOCK(td->td_proc); 1234 racct_set(td->td_proc, RACCT_MEMLOCK, 0); 1235 PROC_UNLOCK(td->td_proc); 1236 } 1237 #endif 1238 1239 return (error); 1240 } 1241 1242 #ifndef _SYS_SYSPROTO_H_ 1243 struct munlock_args { 1244 const void *addr; 1245 size_t len; 1246 }; 1247 #endif 1248 int 1249 sys_munlock(struct thread *td, struct munlock_args *uap) 1250 { 1251 1252 return (kern_munlock(td, (uintptr_t)uap->addr, uap->len)); 1253 } 1254 1255 int 1256 kern_munlock(struct thread *td, uintptr_t addr0, size_t size) 1257 { 1258 vm_offset_t addr, end, last, start; 1259 #ifdef RACCT 1260 vm_map_t map; 1261 #endif 1262 int error; 1263 1264 error = priv_check(td, PRIV_VM_MUNLOCK); 1265 if (error) 1266 return (error); 1267 addr = addr0; 1268 last = addr + size; 1269 start = trunc_page(addr); 1270 end = round_page(last); 1271 if (last < addr || end < addr) 1272 return (EINVAL); 1273 error = vm_map_unwire(&td->td_proc->p_vmspace->vm_map, start, end, 1274 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES); 1275 #ifdef RACCT 1276 if (racct_enable && error == KERN_SUCCESS) { 1277 PROC_LOCK(td->td_proc); 1278 map = &td->td_proc->p_vmspace->vm_map; 1279 racct_set(td->td_proc, RACCT_MEMLOCK, 1280 ptoa(pmap_wired_count(map->pmap))); 1281 PROC_UNLOCK(td->td_proc); 1282 } 1283 #endif 1284 return (error == KERN_SUCCESS ? 0 : ENOMEM); 1285 } 1286 1287 /* 1288 * vm_mmap_vnode() 1289 * 1290 * Helper function for vm_mmap. Perform sanity check specific for mmap 1291 * operations on vnodes. 1292 */ 1293 int 1294 vm_mmap_vnode(struct thread *td, vm_size_t objsize, 1295 vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp, 1296 struct vnode *vp, vm_ooffset_t *foffp, vm_object_t *objp, 1297 boolean_t *writecounted) 1298 { 1299 struct vattr va; 1300 vm_object_t obj; 1301 vm_ooffset_t foff; 1302 struct ucred *cred; 1303 int error, flags; 1304 bool writex; 1305 1306 cred = td->td_ucred; 1307 writex = (*maxprotp & VM_PROT_WRITE) != 0 && 1308 (*flagsp & MAP_SHARED) != 0; 1309 if ((error = vget(vp, LK_SHARED)) != 0) 1310 return (error); 1311 AUDIT_ARG_VNODE1(vp); 1312 foff = *foffp; 1313 flags = *flagsp; 1314 obj = vp->v_object; 1315 if (vp->v_type == VREG) { 1316 /* 1317 * Get the proper underlying object 1318 */ 1319 if (obj == NULL) { 1320 error = EINVAL; 1321 goto done; 1322 } 1323 if (obj->type == OBJT_VNODE && obj->handle != vp) { 1324 vput(vp); 1325 vp = (struct vnode *)obj->handle; 1326 /* 1327 * Bypass filesystems obey the mpsafety of the 1328 * underlying fs. Tmpfs never bypasses. 1329 */ 1330 error = vget(vp, LK_SHARED); 1331 if (error != 0) 1332 return (error); 1333 } 1334 if (writex) { 1335 *writecounted = TRUE; 1336 vm_pager_update_writecount(obj, 0, objsize); 1337 } 1338 } else { 1339 error = EXTERROR(EINVAL, "non-reg file"); 1340 goto done; 1341 } 1342 if ((error = VOP_GETATTR(vp, &va, cred))) 1343 goto done; 1344 #ifdef MAC 1345 /* This relies on VM_PROT_* matching PROT_*. */ 1346 error = mac_vnode_check_mmap(cred, vp, (int)prot, flags); 1347 if (error != 0) 1348 goto done; 1349 #endif 1350 if ((flags & MAP_SHARED) != 0) { 1351 if ((va.va_flags & (SF_SNAPSHOT|IMMUTABLE|APPEND)) != 0) { 1352 if (prot & VM_PROT_WRITE) { 1353 error = EPERM; 1354 goto done; 1355 } 1356 *maxprotp &= ~VM_PROT_WRITE; 1357 } 1358 } 1359 /* 1360 * If it is a regular file without any references 1361 * we do not need to sync it. 1362 * Adjust object size to be the size of actual file. 1363 */ 1364 objsize = round_page(va.va_size); 1365 if (va.va_nlink == 0) 1366 flags |= MAP_NOSYNC; 1367 if (obj->type == OBJT_VNODE) { 1368 obj = vm_pager_allocate(OBJT_VNODE, vp, objsize, prot, foff, 1369 cred); 1370 if (obj == NULL) { 1371 error = ENOMEM; 1372 goto done; 1373 } 1374 } else { 1375 KASSERT((obj->flags & OBJ_SWAP) != 0, ("wrong object type")); 1376 vm_object_reference(obj); 1377 #if VM_NRESERVLEVEL > 0 1378 if ((obj->flags & OBJ_COLORED) == 0) { 1379 VM_OBJECT_WLOCK(obj); 1380 vm_object_color(obj, 0); 1381 VM_OBJECT_WUNLOCK(obj); 1382 } 1383 #endif 1384 } 1385 *objp = obj; 1386 *flagsp = flags; 1387 1388 VOP_MMAPPED(vp); 1389 1390 done: 1391 if (error != 0 && *writecounted) { 1392 *writecounted = FALSE; 1393 vm_pager_update_writecount(obj, objsize, 0); 1394 } 1395 vput(vp); 1396 return (error); 1397 } 1398 1399 /* 1400 * vm_mmap_cdev() 1401 * 1402 * Helper function for vm_mmap. Perform sanity check specific for mmap 1403 * operations on cdevs. 1404 */ 1405 int 1406 vm_mmap_cdev(struct thread *td, vm_size_t objsize, vm_prot_t prot, 1407 vm_prot_t *maxprotp, int *flagsp, struct cdev *cdev, struct cdevsw *dsw, 1408 vm_ooffset_t *foff, vm_object_t *objp) 1409 { 1410 vm_object_t obj; 1411 int error, flags; 1412 1413 flags = *flagsp; 1414 1415 if (dsw->d_flags & D_MMAP_ANON) { 1416 *objp = NULL; 1417 *foff = 0; 1418 *maxprotp = VM_PROT_ALL; 1419 *flagsp |= MAP_ANON; 1420 return (0); 1421 } 1422 1423 /* 1424 * cdevs do not provide private mappings of any kind. 1425 */ 1426 if ((*maxprotp & VM_PROT_WRITE) == 0 && 1427 (prot & VM_PROT_WRITE) != 0) 1428 return (EACCES); 1429 if ((flags & (MAP_PRIVATE | MAP_COPY)) != 0) { 1430 return (EXTERROR(EINVAL, "cdev mapping must be shared")); 1431 } 1432 1433 /* 1434 * Force device mappings to be shared. 1435 */ 1436 flags |= MAP_SHARED; 1437 #ifdef MAC_XXX 1438 error = mac_cdev_check_mmap(td->td_ucred, cdev, (int)prot); 1439 if (error != 0) 1440 return (error); 1441 #endif 1442 /* 1443 * First, try d_mmap_single(). If that is not implemented 1444 * (returns ENODEV), fall back to using the device pager. 1445 * Note that d_mmap_single() must return a reference to the 1446 * object (it needs to bump the reference count of the object 1447 * it returns somehow). 1448 * 1449 * XXX assumes VM_PROT_* == PROT_* 1450 */ 1451 error = dsw->d_mmap_single(cdev, foff, objsize, objp, (int)prot); 1452 if (error != ENODEV) 1453 return (error); 1454 obj = vm_pager_allocate(OBJT_DEVICE, cdev, objsize, prot, *foff, 1455 td->td_ucred); 1456 if (obj == NULL) { 1457 return (EXTERROR(EINVAL, 1458 "cdev driver does not support mmap")); 1459 } 1460 *objp = obj; 1461 *flagsp = flags; 1462 return (0); 1463 } 1464 1465 int 1466 vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot, 1467 vm_prot_t maxprot, int flags, 1468 objtype_t handle_type, void *handle, 1469 vm_ooffset_t foff) 1470 { 1471 vm_object_t object; 1472 struct thread *td = curthread; 1473 int error; 1474 boolean_t writecounted; 1475 1476 if (size == 0) { 1477 return (EXTERROR(EINVAL, "zero-sized req")); 1478 } 1479 1480 size = round_page(size); 1481 object = NULL; 1482 writecounted = FALSE; 1483 1484 switch (handle_type) { 1485 case OBJT_DEVICE: { 1486 struct cdevsw *dsw; 1487 struct cdev *cdev; 1488 int ref; 1489 1490 cdev = handle; 1491 dsw = dev_refthread(cdev, &ref); 1492 if (dsw == NULL) 1493 return (ENXIO); 1494 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, cdev, 1495 dsw, &foff, &object); 1496 dev_relthread(cdev, ref); 1497 break; 1498 } 1499 case OBJT_VNODE: 1500 error = vm_mmap_vnode(td, size, prot, &maxprot, &flags, 1501 handle, &foff, &object, &writecounted); 1502 break; 1503 default: 1504 error = EXTERROR(EINVAL, "unsupported backing obj type %jd", 1505 handle_type); 1506 break; 1507 } 1508 if (error) 1509 return (error); 1510 1511 error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object, 1512 foff, writecounted, td); 1513 if (error != 0 && object != NULL) { 1514 /* 1515 * If this mapping was accounted for in the vnode's 1516 * writecount, then undo that now. 1517 */ 1518 if (writecounted) 1519 vm_pager_release_writecount(object, 0, size); 1520 vm_object_deallocate(object); 1521 } 1522 return (error); 1523 } 1524 1525 int 1526 kern_mmap_racct_check(struct thread *td, vm_map_t map, vm_size_t size) 1527 { 1528 int error; 1529 1530 RACCT_PROC_LOCK(td->td_proc); 1531 if (map->size + size > lim_cur(td, RLIMIT_VMEM)) { 1532 RACCT_PROC_UNLOCK(td->td_proc); 1533 return (ENOMEM); 1534 } 1535 if (racct_set(td->td_proc, RACCT_VMEM, map->size + size)) { 1536 RACCT_PROC_UNLOCK(td->td_proc); 1537 return (ENOMEM); 1538 } 1539 if (!old_mlock && map->flags & MAP_WIREFUTURE) { 1540 if (ptoa(pmap_wired_count(map->pmap)) + size > 1541 lim_cur(td, RLIMIT_MEMLOCK)) { 1542 racct_set_force(td->td_proc, RACCT_VMEM, map->size); 1543 RACCT_PROC_UNLOCK(td->td_proc); 1544 return (ENOMEM); 1545 } 1546 error = racct_set(td->td_proc, RACCT_MEMLOCK, 1547 ptoa(pmap_wired_count(map->pmap)) + size); 1548 if (error != 0) { 1549 racct_set_force(td->td_proc, RACCT_VMEM, map->size); 1550 RACCT_PROC_UNLOCK(td->td_proc); 1551 return (error); 1552 } 1553 } 1554 RACCT_PROC_UNLOCK(td->td_proc); 1555 return (0); 1556 } 1557 1558 /* 1559 * Internal version of mmap that maps a specific VM object into an 1560 * map. Called by mmap for MAP_ANON, vm_mmap, shm_mmap, and vn_mmap. 1561 */ 1562 int 1563 vm_mmap_object(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot, 1564 vm_prot_t maxprot, int flags, vm_object_t object, vm_ooffset_t foff, 1565 boolean_t writecounted, struct thread *td) 1566 { 1567 vm_offset_t default_addr, max_addr; 1568 int docow, error, findspace, rv; 1569 bool curmap, fitit; 1570 1571 curmap = map == &td->td_proc->p_vmspace->vm_map; 1572 if (curmap) { 1573 error = kern_mmap_racct_check(td, map, size); 1574 if (error != 0) 1575 return (error); 1576 } 1577 1578 /* 1579 * We currently can only deal with page aligned file offsets. 1580 * The mmap() system call already enforces this by subtracting 1581 * the page offset from the file offset, but checking here 1582 * catches errors in device drivers (e.g. d_single_mmap() 1583 * callbacks) and other internal mapping requests (such as in 1584 * exec). 1585 */ 1586 if ((foff & PAGE_MASK) != 0) { 1587 return (EXTERROR(EINVAL, "offset %#jx not page-aligned", foff)); 1588 } 1589 1590 if ((flags & MAP_FIXED) == 0) { 1591 fitit = true; 1592 *addr = round_page(*addr); 1593 } else { 1594 if (*addr != trunc_page(*addr)) { 1595 return (EXTERROR(EINVAL, 1596 "non-fixed mapping address %#jx not aligned", 1597 *addr)); 1598 } 1599 fitit = false; 1600 } 1601 1602 if (flags & MAP_ANON) { 1603 if (object != NULL) { 1604 return (EXTERROR(EINVAL, 1605 "anon mapping backed by an object")); 1606 } 1607 if (foff != 0) { 1608 return (EXTERROR(EINVAL, 1609 "anon mapping with non-zero offset %#jx", foff)); 1610 } 1611 docow = 0; 1612 } else if (flags & MAP_PREFAULT_READ) 1613 docow = MAP_PREFAULT; 1614 else 1615 docow = MAP_PREFAULT_PARTIAL; 1616 1617 if ((flags & (MAP_ANON|MAP_SHARED)) == 0) 1618 docow |= MAP_COPY_ON_WRITE; 1619 if (flags & MAP_NOSYNC) 1620 docow |= MAP_DISABLE_SYNCER; 1621 if (flags & MAP_NOCORE) 1622 docow |= MAP_DISABLE_COREDUMP; 1623 /* Shared memory is also shared with children. */ 1624 if (flags & MAP_SHARED) 1625 docow |= MAP_INHERIT_SHARE; 1626 if (writecounted) 1627 docow |= MAP_WRITECOUNT; 1628 if (flags & MAP_STACK) { 1629 if (object != NULL) { 1630 return (EXTERROR(EINVAL, 1631 "stack mapping backed by an object")); 1632 } 1633 docow |= MAP_STACK_AREA; 1634 } 1635 if ((flags & MAP_EXCL) != 0) 1636 docow |= MAP_CHECK_EXCL; 1637 if ((flags & MAP_GUARD) != 0) 1638 docow |= MAP_CREATE_GUARD; 1639 1640 if (fitit) { 1641 if ((flags & MAP_ALIGNMENT_MASK) == MAP_ALIGNED_SUPER) 1642 findspace = VMFS_SUPER_SPACE; 1643 else if ((flags & MAP_ALIGNMENT_MASK) != 0) 1644 findspace = VMFS_ALIGNED_SPACE(flags >> 1645 MAP_ALIGNMENT_SHIFT); 1646 else 1647 findspace = VMFS_OPTIMAL_SPACE; 1648 max_addr = 0; 1649 if ((flags & MAP_32BIT) != 0) 1650 max_addr = MAP_32BIT_MAX_ADDR; 1651 if (curmap) { 1652 default_addr = 1653 round_page((vm_offset_t)td->td_proc->p_vmspace-> 1654 vm_daddr + lim_max(td, RLIMIT_DATA)); 1655 if ((flags & MAP_32BIT) != 0) 1656 default_addr = 0; 1657 rv = vm_map_find_min(map, object, foff, addr, size, 1658 default_addr, max_addr, findspace, prot, maxprot, 1659 docow); 1660 } else { 1661 rv = vm_map_find(map, object, foff, addr, size, 1662 max_addr, findspace, prot, maxprot, docow); 1663 } 1664 } else { 1665 rv = vm_map_fixed(map, object, foff, *addr, size, 1666 prot, maxprot, docow); 1667 } 1668 1669 if (rv == KERN_SUCCESS) { 1670 /* 1671 * If the process has requested that all future mappings 1672 * be wired, then heed this. 1673 */ 1674 if ((map->flags & MAP_WIREFUTURE) != 0) { 1675 vm_map_lock(map); 1676 if ((map->flags & MAP_WIREFUTURE) != 0) 1677 (void)vm_map_wire_locked(map, *addr, 1678 *addr + size, VM_MAP_WIRE_USER | 1679 ((flags & MAP_STACK) ? VM_MAP_WIRE_HOLESOK : 1680 VM_MAP_WIRE_NOHOLES)); 1681 vm_map_unlock(map); 1682 } 1683 } 1684 return (vm_mmap_to_errno(rv)); 1685 } 1686 1687 /* 1688 * Translate a Mach VM return code to zero on success or the appropriate errno 1689 * on failure. 1690 */ 1691 int 1692 vm_mmap_to_errno(int rv) 1693 { 1694 int error; 1695 1696 switch (rv) { 1697 case KERN_SUCCESS: 1698 return (0); 1699 case KERN_INVALID_ADDRESS: 1700 case KERN_NO_SPACE: 1701 error = ENOMEM; 1702 break; 1703 case KERN_PROTECTION_FAILURE: 1704 error = EACCES; 1705 break; 1706 default: 1707 error = EINVAL; 1708 break; 1709 } 1710 if ((curthread->td_pflags2 & (TDP2_UEXTERR | TDP2_EXTERR)) == 1711 TDP2_UEXTERR) 1712 EXTERROR(error, "mach error %jd", rv); 1713 return (error); 1714 } 1715