FreeBSD virtual memory subsystem code
vm_mmap.c
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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 * @(#)vm_mmap.c 8.4 (Berkeley) 1/12/94
39 */
40
41/*
42 * Mapped file (mmap) interface to VM
43 */
44
45#include <sys/cdefs.h>
46__FBSDID("$FreeBSD$");
47
48#include "opt_hwpmc_hooks.h"
49#include "opt_vm.h"
50
51#include <sys/param.h>
52#include <sys/systm.h>
53#include <sys/capsicum.h>
54#include <sys/kernel.h>
55#include <sys/lock.h>
56#include <sys/mutex.h>
57#include <sys/sysproto.h>
58#include <sys/elf.h>
59#include <sys/filedesc.h>
60#include <sys/priv.h>
61#include <sys/proc.h>
62#include <sys/procctl.h>
63#include <sys/racct.h>
64#include <sys/resource.h>
65#include <sys/resourcevar.h>
66#include <sys/rwlock.h>
67#include <sys/sysctl.h>
68#include <sys/vnode.h>
69#include <sys/fcntl.h>
70#include <sys/file.h>
71#include <sys/mman.h>
72#include <sys/mount.h>
73#include <sys/conf.h>
74#include <sys/stat.h>
75#include <sys/syscallsubr.h>
76#include <sys/sysent.h>
77#include <sys/vmmeter.h>
78#if defined(__amd64__) || defined(__i386__) /* for i386_read_exec */
79#include <machine/md_var.h>
80#endif
81
82#include <security/audit/audit.h>
83#include <security/mac/mac_framework.h>
84
85#include <vm/vm.h>
86#include <vm/vm_param.h>
87#include <vm/pmap.h>
88#include <vm/vm_map.h>
89#include <vm/vm_object.h>
90#include <vm/vm_page.h>
91#include <vm/vm_pager.h>
92#include <vm/vm_pageout.h>
93#include <vm/vm_extern.h>
94#include <vm/vm_page.h>
95#include <vm/vnode_pager.h>
96
97#ifdef HWPMC_HOOKS
98#include <sys/pmckern.h>
99#endif
100
101int old_mlock = 0;
102SYSCTL_INT(_vm, OID_AUTO, old_mlock, CTLFLAG_RWTUN, &old_mlock, 0,
103 "Do not apply RLIMIT_MEMLOCK on mlockall");
104static int mincore_mapped = 1;
105SYSCTL_INT(_vm, OID_AUTO, mincore_mapped, CTLFLAG_RWTUN, &mincore_mapped, 0,
106 "mincore reports mappings, not residency");
107static int imply_prot_max = 0;
108SYSCTL_INT(_vm, OID_AUTO, imply_prot_max, CTLFLAG_RWTUN, &imply_prot_max, 0,
109 "Imply maximum page protections in mmap() when none are specified");
110
111#ifdef MAP_32BIT
112#define MAP_32BIT_MAX_ADDR ((vm_offset_t)1 << 31)
113#endif
114
115_Static_assert(MAXPAGESIZES <= 4, "MINCORE_SUPER too narrow");
116
117#ifndef _SYS_SYSPROTO_H_
118struct sbrk_args {
119 int incr;
120};
121#endif
122
123int
124sys_sbrk(struct thread *td, struct sbrk_args *uap)
125{
126 /* Not yet implemented */
127 return (EOPNOTSUPP);
128}
129
130#ifndef _SYS_SYSPROTO_H_
131struct sstk_args {
132 int incr;
133};
134#endif
135
136int
137sys_sstk(struct thread *td, struct sstk_args *uap)
138{
139 /* Not yet implemented */
140 return (EOPNOTSUPP);
141}
142
143#if defined(COMPAT_43)
144int
145ogetpagesize(struct thread *td, struct ogetpagesize_args *uap)
146{
147
148 td->td_retval[0] = PAGE_SIZE;
149 return (0);
150}
151#endif /* COMPAT_43 */
152
153/*
154 * Memory Map (mmap) system call. Note that the file offset
155 * and address are allowed to be NOT page aligned, though if
156 * the MAP_FIXED flag it set, both must have the same remainder
157 * modulo the PAGE_SIZE (POSIX 1003.1b). If the address is not
158 * page-aligned, the actual mapping starts at trunc_page(addr)
159 * and the return value is adjusted up by the page offset.
160 *
161 * Generally speaking, only character devices which are themselves
162 * memory-based, such as a video framebuffer, can be mmap'd. Otherwise
163 * there would be no cache coherency between a descriptor and a VM mapping
164 * both to the same character device.
165 */
166#ifndef _SYS_SYSPROTO_H_
167struct mmap_args {
168 void *addr;
169 size_t len;
170 int prot;
171 int flags;
172 int fd;
173 long pad;
174 off_t pos;
175};
176#endif
177
178int
179sys_mmap(struct thread *td, struct mmap_args *uap)
180{
181
182 return (kern_mmap(td, &(struct mmap_req){
183 .mr_hint = (uintptr_t)uap->addr,
184 .mr_len = uap->len,
185 .mr_prot = uap->prot,
186 .mr_flags = uap->flags,
187 .mr_fd = uap->fd,
188 .mr_pos = uap->pos,
189 }));
190}
191
192int
193kern_mmap_maxprot(struct proc *p, int prot)
194{
195
196 if ((p->p_flag2 & P2_PROTMAX_DISABLE) != 0 ||
197 (p->p_fctl0 & NT_FREEBSD_FCTL_PROTMAX_DISABLE) != 0)
198 return (_PROT_ALL);
199 if (((p->p_flag2 & P2_PROTMAX_ENABLE) != 0 || imply_prot_max) &&
200 prot != PROT_NONE)
201 return (prot);
202 return (_PROT_ALL);
203}
204
205int
206kern_mmap(struct thread *td, const struct mmap_req *mrp)
207{
208 struct vmspace *vms;
209 struct file *fp;
210 struct proc *p;
211 off_t pos;
212 vm_offset_t addr, orig_addr;
213 vm_size_t len, pageoff, size;
214 vm_prot_t cap_maxprot;
215 int align, error, fd, flags, max_prot, prot;
216 cap_rights_t rights;
217 mmap_check_fp_fn check_fp_fn;
218
219 orig_addr = addr = mrp->mr_hint;
220 len = mrp->mr_len;
221 prot = mrp->mr_prot;
222 flags = mrp->mr_flags;
223 fd = mrp->mr_fd;
224 pos = mrp->mr_pos;
225 check_fp_fn = mrp->mr_check_fp_fn;
226
227 if ((prot & ~(_PROT_ALL | PROT_MAX(_PROT_ALL))) != 0)
228 return (EINVAL);
229 max_prot = PROT_MAX_EXTRACT(prot);
230 prot = PROT_EXTRACT(prot);
231 if (max_prot != 0 && (max_prot & prot) != prot)
232 return (ENOTSUP);
233
234 p = td->td_proc;
235
236 /*
237 * Always honor PROT_MAX if set. If not, default to all
238 * permissions unless we're implying maximum permissions.
239 */
240 if (max_prot == 0)
241 max_prot = kern_mmap_maxprot(p, prot);
242
243 vms = p->p_vmspace;
244 fp = NULL;
245 AUDIT_ARG_FD(fd);
246
247 /*
248 * Ignore old flags that used to be defined but did not do anything.
249 */
250 flags &= ~(MAP_RESERVED0020 | MAP_RESERVED0040);
251
252 /*
253 * Enforce the constraints.
254 * Mapping of length 0 is only allowed for old binaries.
255 * Anonymous mapping shall specify -1 as filedescriptor and
256 * zero position for new code. Be nice to ancient a.out
257 * binaries and correct pos for anonymous mapping, since old
258 * ld.so sometimes issues anonymous map requests with non-zero
259 * pos.
260 */
261 if (!SV_CURPROC_FLAG(SV_AOUT)) {
262 if ((len == 0 && p->p_osrel >= P_OSREL_MAP_ANON) ||
263 ((flags & MAP_ANON) != 0 && (fd != -1 || pos != 0)))
264 return (EINVAL);
265 } else {
266 if ((flags & MAP_ANON) != 0)
267 pos = 0;
268 }
269
270 if (flags & MAP_STACK) {
271 if ((fd != -1) ||
272 ((prot & (PROT_READ | PROT_WRITE)) != (PROT_READ | PROT_WRITE)))
273 return (EINVAL);
274 flags |= MAP_ANON;
275 pos = 0;
276 }
277 if ((flags & ~(MAP_SHARED | MAP_PRIVATE | MAP_FIXED | MAP_HASSEMAPHORE |
278 MAP_STACK | MAP_NOSYNC | MAP_ANON | MAP_EXCL | MAP_NOCORE |
279 MAP_PREFAULT_READ | MAP_GUARD |
280#ifdef MAP_32BIT
281 MAP_32BIT |
282#endif
283 MAP_ALIGNMENT_MASK)) != 0)
284 return (EINVAL);
285 if ((flags & (MAP_EXCL | MAP_FIXED)) == MAP_EXCL)
286 return (EINVAL);
287 if ((flags & (MAP_SHARED | MAP_PRIVATE)) == (MAP_SHARED | MAP_PRIVATE))
288 return (EINVAL);
289 if (prot != PROT_NONE &&
290 (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) != 0)
291 return (EINVAL);
292 if ((flags & MAP_GUARD) != 0 && (prot != PROT_NONE || fd != -1 ||
293 pos != 0 || (flags & ~(MAP_FIXED | MAP_GUARD | MAP_EXCL |
294#ifdef MAP_32BIT
295 MAP_32BIT |
296#endif
297 MAP_ALIGNMENT_MASK)) != 0))
298 return (EINVAL);
299
300 /*
301 * Align the file position to a page boundary,
302 * and save its page offset component.
303 */
304 pageoff = (pos & PAGE_MASK);
305 pos -= pageoff;
306
307 /* Compute size from len by rounding (on both ends). */
308 size = len + pageoff; /* low end... */
309 size = round_page(size); /* hi end */
310 /* Check for rounding up to zero. */
311 if (len > size)
312 return (ENOMEM);
313
314 /* Ensure alignment is at least a page and fits in a pointer. */
315 align = flags & MAP_ALIGNMENT_MASK;
316 if (align != 0 && align != MAP_ALIGNED_SUPER &&
317 (align >> MAP_ALIGNMENT_SHIFT >= sizeof(void *) * NBBY ||
318 align >> MAP_ALIGNMENT_SHIFT < PAGE_SHIFT))
319 return (EINVAL);
320
321 /*
322 * Check for illegal addresses. Watch out for address wrap... Note
323 * that VM_*_ADDRESS are not constants due to casts (argh).
324 */
325 if (flags & MAP_FIXED) {
326 /*
327 * The specified address must have the same remainder
328 * as the file offset taken modulo PAGE_SIZE, so it
329 * should be aligned after adjustment by pageoff.
330 */
331 addr -= pageoff;
332 if (addr & PAGE_MASK)
333 return (EINVAL);
334
335 /* Address range must be all in user VM space. */
336 if (!vm_map_range_valid(&vms->vm_map, addr, addr + size))
337 return (EINVAL);
338#ifdef MAP_32BIT
339 if (flags & MAP_32BIT && addr + size > MAP_32BIT_MAX_ADDR)
340 return (EINVAL);
341 } else if (flags & MAP_32BIT) {
342 /*
343 * For MAP_32BIT, override the hint if it is too high and
344 * do not bother moving the mapping past the heap (since
345 * the heap is usually above 2GB).
346 */
347 if (addr + size > MAP_32BIT_MAX_ADDR)
348 addr = 0;
349#endif
350 } else {
351 /*
352 * XXX for non-fixed mappings where no hint is provided or
353 * the hint would fall in the potential heap space,
354 * place it after the end of the largest possible heap.
355 *
356 * There should really be a pmap call to determine a reasonable
357 * location.
358 */
359 if (addr == 0 ||
360 (addr >= round_page((vm_offset_t)vms->vm_taddr) &&
361 addr < round_page((vm_offset_t)vms->vm_daddr +
362 lim_max(td, RLIMIT_DATA))))
363 addr = round_page((vm_offset_t)vms->vm_daddr +
364 lim_max(td, RLIMIT_DATA));
365 }
366 if (len == 0) {
367 /*
368 * Return success without mapping anything for old
369 * binaries that request a page-aligned mapping of
370 * length 0. For modern binaries, this function
371 * returns an error earlier.
372 */
373 error = 0;
374 } else if ((flags & MAP_GUARD) != 0) {
375 error = vm_mmap_object(&vms->vm_map, &addr, size, VM_PROT_NONE,
376 VM_PROT_NONE, flags, NULL, pos, FALSE, td);
377 } else if ((flags & MAP_ANON) != 0) {
378 /*
379 * Mapping blank space is trivial.
380 *
381 * This relies on VM_PROT_* matching PROT_*.
382 */
383 error = vm_mmap_object(&vms->vm_map, &addr, size, prot,
384 max_prot, flags, NULL, pos, FALSE, td);
385 } else {
386 /*
387 * Mapping file, get fp for validation and don't let the
388 * descriptor disappear on us if we block. Check capability
389 * rights, but also return the maximum rights to be combined
390 * with maxprot later.
391 */
392 cap_rights_init_one(&rights, CAP_MMAP);
393 if (prot & PROT_READ)
394 cap_rights_set_one(&rights, CAP_MMAP_R);
395 if ((flags & MAP_SHARED) != 0) {
396 if (prot & PROT_WRITE)
397 cap_rights_set_one(&rights, CAP_MMAP_W);
398 }
399 if (prot & PROT_EXEC)
400 cap_rights_set_one(&rights, CAP_MMAP_X);
401 error = fget_mmap(td, fd, &rights, &cap_maxprot, &fp);
402 if (error != 0)
403 goto done;
404 if ((flags & (MAP_SHARED | MAP_PRIVATE)) == 0 &&
405 p->p_osrel >= P_OSREL_MAP_FSTRICT) {
406 error = EINVAL;
407 goto done;
408 }
409 if (check_fp_fn != NULL) {
410 error = check_fp_fn(fp, prot, max_prot & cap_maxprot,
411 flags);
412 if (error != 0)
413 goto done;
414 }
415 if (fp->f_ops == &shm_ops && shm_largepage(fp->f_data))
416 addr = orig_addr;
417 /* This relies on VM_PROT_* matching PROT_*. */
418 error = fo_mmap(fp, &vms->vm_map, &addr, size, prot,
419 max_prot & cap_maxprot, flags, pos, td);
420 }
421
422 if (error == 0)
423 td->td_retval[0] = (register_t) (addr + pageoff);
424done:
425 if (fp)
426 fdrop(fp, td);
427
428 return (error);
429}
430
431#if defined(COMPAT_FREEBSD6)
432int
433freebsd6_mmap(struct thread *td, struct freebsd6_mmap_args *uap)
434{
435 return (kern_mmap(td, &(struct mmap_req){
436 .mr_hint = (uintptr_t)uap->addr,
437 .mr_len = uap->len,
438 .mr_prot = uap->prot,
439 .mr_flags = uap->flags,
440 .mr_fd = uap->fd,
441 .mr_pos = uap->pos,
442 }));
443}
444#endif
445
446#ifdef COMPAT_43
447#ifndef _SYS_SYSPROTO_H_
448struct ommap_args {
449 caddr_t addr;
450 int len;
451 int prot;
452 int flags;
453 int fd;
454 long pos;
455};
456#endif
457int
458ommap(struct thread *td, struct ommap_args *uap)
459{
460 return (kern_ommap(td, (uintptr_t)uap->addr, uap->len, uap->prot,
461 uap->flags, uap->fd, uap->pos));
462}
463
464int
465kern_ommap(struct thread *td, uintptr_t hint, int len, int oprot,
466 int oflags, int fd, long pos)
467{
468 static const char cvtbsdprot[8] = {
469 0,
470 PROT_EXEC,
471 PROT_WRITE,
472 PROT_EXEC | PROT_WRITE,
473 PROT_READ,
474 PROT_EXEC | PROT_READ,
475 PROT_WRITE | PROT_READ,
476 PROT_EXEC | PROT_WRITE | PROT_READ,
477 };
478 int flags, prot;
479
480 if (len < 0)
481 return (EINVAL);
482
483#define OMAP_ANON 0x0002
484#define OMAP_COPY 0x0020
485#define OMAP_SHARED 0x0010
486#define OMAP_FIXED 0x0100
487
488 prot = cvtbsdprot[oprot & 0x7];
489#if (defined(COMPAT_FREEBSD32) && defined(__amd64__)) || defined(__i386__)
490 if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32) &&
491 prot != 0)
492 prot |= PROT_EXEC;
493#endif
494 flags = 0;
495 if (oflags & OMAP_ANON)
496 flags |= MAP_ANON;
497 if (oflags & OMAP_COPY)
498 flags |= MAP_COPY;
499 if (oflags & OMAP_SHARED)
500 flags |= MAP_SHARED;
501 else
502 flags |= MAP_PRIVATE;
503 if (oflags & OMAP_FIXED)
504 flags |= MAP_FIXED;
505 return (kern_mmap(td, &(struct mmap_req){
506 .mr_hint = hint,
507 .mr_len = len,
508 .mr_prot = prot,
509 .mr_flags = flags,
510 .mr_fd = fd,
511 .mr_pos = pos,
512 }));
513}
514#endif /* COMPAT_43 */
515
516#ifndef _SYS_SYSPROTO_H_
518 void *addr;
519 size_t len;
520 int flags;
521};
522#endif
523int
524sys_msync(struct thread *td, struct msync_args *uap)
525{
526
527 return (kern_msync(td, (uintptr_t)uap->addr, uap->len, uap->flags));
528}
529
530int
531kern_msync(struct thread *td, uintptr_t addr0, size_t size, int flags)
532{
533 vm_offset_t addr;
534 vm_size_t pageoff;
535 vm_map_t map;
536 int rv;
537
538 addr = addr0;
539 pageoff = (addr & PAGE_MASK);
540 addr -= pageoff;
541 size += pageoff;
542 size = (vm_size_t) round_page(size);
543 if (addr + size < addr)
544 return (EINVAL);
545
546 if ((flags & (MS_ASYNC|MS_INVALIDATE)) == (MS_ASYNC|MS_INVALIDATE))
547 return (EINVAL);
548
549 map = &td->td_proc->p_vmspace->vm_map;
550
551 /*
552 * Clean the pages and interpret the return value.
553 */
554 rv = vm_map_sync(map, addr, addr + size, (flags & MS_ASYNC) == 0,
555 (flags & MS_INVALIDATE) != 0);
556 switch (rv) {
557 case KERN_SUCCESS:
558 return (0);
560 return (ENOMEM);
562 return (EBUSY);
563 case KERN_FAILURE:
564 return (EIO);
565 default:
566 return (EINVAL);
567 }
568}
569
570#ifndef _SYS_SYSPROTO_H_
572 void *addr;
573 size_t len;
574};
575#endif
576int
577sys_munmap(struct thread *td, struct munmap_args *uap)
578{
579
580 return (kern_munmap(td, (uintptr_t)uap->addr, uap->len));
581}
582
583int
584kern_munmap(struct thread *td, uintptr_t addr0, size_t size)
585{
586#ifdef HWPMC_HOOKS
587 struct pmckern_map_out pkm;
588 vm_map_entry_t entry;
589 bool pmc_handled;
590#endif
591 vm_offset_t addr, end;
592 vm_size_t pageoff;
593 vm_map_t map;
594 int rv;
595
596 if (size == 0)
597 return (EINVAL);
598
599 addr = addr0;
600 pageoff = (addr & PAGE_MASK);
601 addr -= pageoff;
602 size += pageoff;
603 size = (vm_size_t) round_page(size);
604 end = addr + size;
605 map = &td->td_proc->p_vmspace->vm_map;
606 if (!vm_map_range_valid(map, addr, end))
607 return (EINVAL);
608
609 vm_map_lock(map);
610#ifdef HWPMC_HOOKS
611 pmc_handled = false;
612 if (PMC_HOOK_INSTALLED(PMC_FN_MUNMAP)) {
613 pmc_handled = true;
614 /*
615 * Inform hwpmc if the address range being unmapped contains
616 * an executable region.
617 */
618 pkm.pm_address = (uintptr_t) NULL;
619 if (vm_map_lookup_entry(map, addr, &entry)) {
620 for (; entry->start < end;
621 entry = vm_map_entry_succ(entry)) {
622 if (vm_map_check_protection(map, entry->start,
623 entry->end, VM_PROT_EXECUTE) == TRUE) {
624 pkm.pm_address = (uintptr_t) addr;
625 pkm.pm_size = (size_t) size;
626 break;
627 }
628 }
629 }
630 }
631#endif
632 rv = vm_map_delete(map, addr, end);
633
634#ifdef HWPMC_HOOKS
635 if (rv == KERN_SUCCESS && __predict_false(pmc_handled)) {
636 /* downgrade the lock to prevent a LOR with the pmc-sx lock */
638 if (pkm.pm_address != (uintptr_t) NULL)
639 PMC_CALL_HOOK(td, PMC_FN_MUNMAP, (void *) &pkm);
641 } else
642#endif
643 vm_map_unlock(map);
644
645 return (vm_mmap_to_errno(rv));
646}
647
648#ifndef _SYS_SYSPROTO_H_
650 const void *addr;
651 size_t len;
652 int prot;
653};
654#endif
655int
656sys_mprotect(struct thread *td, struct mprotect_args *uap)
657{
658
659 return (kern_mprotect(td, (uintptr_t)uap->addr, uap->len, uap->prot));
660}
661
662int
663kern_mprotect(struct thread *td, uintptr_t addr0, size_t size, int prot)
664{
665 vm_offset_t addr;
666 vm_size_t pageoff;
667 int vm_error, max_prot;
668 int flags;
669
670 addr = addr0;
671 if ((prot & ~(_PROT_ALL | PROT_MAX(_PROT_ALL))) != 0)
672 return (EINVAL);
673 max_prot = PROT_MAX_EXTRACT(prot);
674 prot = PROT_EXTRACT(prot);
675 pageoff = (addr & PAGE_MASK);
676 addr -= pageoff;
677 size += pageoff;
678 size = (vm_size_t) round_page(size);
679#ifdef COMPAT_FREEBSD32
680 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
681 if (((addr + size) & 0xffffffff) < addr)
682 return (EINVAL);
683 } else
684#endif
685 if (addr + size < addr)
686 return (EINVAL);
687
689 if (max_prot != 0)
691 vm_error = vm_map_protect(&td->td_proc->p_vmspace->vm_map,
692 addr, addr + size, prot, max_prot, flags);
693
694 switch (vm_error) {
695 case KERN_SUCCESS:
696 return (0);
698 return (EACCES);
700 return (ENOMEM);
702 return (ENOTSUP);
703 }
704 return (EINVAL);
705}
706
707#ifndef _SYS_SYSPROTO_H_
709 void *addr;
710 size_t len;
712};
713#endif
714int
715sys_minherit(struct thread *td, struct minherit_args *uap)
716{
717
718 return (kern_minherit(td, (uintptr_t)uap->addr, uap->len,
719 uap->inherit));
720}
721
722int
723kern_minherit(struct thread *td, uintptr_t addr0, size_t len, int inherit0)
724{
725 vm_offset_t addr;
726 vm_size_t size, pageoff;
727 vm_inherit_t inherit;
728
729 addr = (vm_offset_t)addr0;
730 size = len;
731 inherit = inherit0;
732
733 pageoff = (addr & PAGE_MASK);
734 addr -= pageoff;
735 size += pageoff;
736 size = (vm_size_t) round_page(size);
737 if (addr + size < addr)
738 return (EINVAL);
739
740 switch (vm_map_inherit(&td->td_proc->p_vmspace->vm_map, addr,
741 addr + size, inherit)) {
742 case KERN_SUCCESS:
743 return (0);
745 return (EACCES);
746 }
747 return (EINVAL);
748}
749
750#ifndef _SYS_SYSPROTO_H_
752 void *addr;
753 size_t len;
754 int behav;
755};
756#endif
757
758int
759sys_madvise(struct thread *td, struct madvise_args *uap)
760{
761
762 return (kern_madvise(td, (uintptr_t)uap->addr, uap->len, uap->behav));
763}
764
765int
766kern_madvise(struct thread *td, uintptr_t addr0, size_t len, int behav)
767{
768 vm_map_t map;
769 vm_offset_t addr, end, start;
770 int flags;
771
772 /*
773 * Check for our special case, advising the swap pager we are
774 * "immortal."
775 */
776 if (behav == MADV_PROTECT) {
777 flags = PPROT_SET;
778 return (kern_procctl(td, P_PID, td->td_proc->p_pid,
779 PROC_SPROTECT, &flags));
780 }
781
782 /*
783 * Check for illegal addresses. Watch out for address wrap... Note
784 * that VM_*_ADDRESS are not constants due to casts (argh).
785 */
786 map = &td->td_proc->p_vmspace->vm_map;
787 addr = addr0;
788 if (!vm_map_range_valid(map, addr, addr + len))
789 return (EINVAL);
790
791 /*
792 * Since this routine is only advisory, we default to conservative
793 * behavior.
794 */
795 start = trunc_page(addr);
796 end = round_page(addr + len);
797
798 /*
799 * vm_map_madvise() checks for illegal values of behav.
800 */
801 return (vm_map_madvise(map, start, end, behav));
802}
803
804#ifndef _SYS_SYSPROTO_H_
806 const void *addr;
807 size_t len;
808 char *vec;
809};
810#endif
811
812int
813sys_mincore(struct thread *td, struct mincore_args *uap)
814{
815
816 return (kern_mincore(td, (uintptr_t)uap->addr, uap->len, uap->vec));
817}
818
819int
820kern_mincore(struct thread *td, uintptr_t addr0, size_t len, char *vec)
821{
822 pmap_t pmap;
823 vm_map_t map;
824 vm_map_entry_t current, entry;
825 vm_object_t object;
826 vm_offset_t addr, cend, end, first_addr;
827 vm_paddr_t pa;
828 vm_page_t m;
829 vm_pindex_t pindex;
830 int error, lastvecindex, mincoreinfo, vecindex;
831 unsigned int timestamp;
832
833 /*
834 * Make sure that the addresses presented are valid for user
835 * mode.
836 */
837 first_addr = addr = trunc_page(addr0);
838 end = round_page(addr0 + len);
839 map = &td->td_proc->p_vmspace->vm_map;
840 if (end > vm_map_max(map) || end < addr)
841 return (ENOMEM);
842
843 pmap = vmspace_pmap(td->td_proc->p_vmspace);
844
845 vm_map_lock_read(map);
846RestartScan:
847 timestamp = map->timestamp;
848
849 if (!vm_map_lookup_entry(map, addr, &entry)) {
851 return (ENOMEM);
852 }
853
854 /*
855 * Do this on a map entry basis so that if the pages are not
856 * in the current processes address space, we can easily look
857 * up the pages elsewhere.
858 */
859 lastvecindex = -1;
860 while (entry->start < end) {
861 /*
862 * check for contiguity
863 */
864 current = entry;
865 entry = vm_map_entry_succ(current);
866 if (current->end < end &&
867 entry->start > current->end) {
869 return (ENOMEM);
870 }
871
872 /*
873 * ignore submaps (for now) or null objects
874 */
875 if ((current->eflags & MAP_ENTRY_IS_SUB_MAP) ||
876 current->object.vm_object == NULL)
877 continue;
878
879 /*
880 * limit this scan to the current map entry and the
881 * limits for the mincore call
882 */
883 if (addr < current->start)
884 addr = current->start;
885 cend = current->end;
886 if (cend > end)
887 cend = end;
888
889 for (; addr < cend; addr += PAGE_SIZE) {
890 /*
891 * Check pmap first, it is likely faster, also
892 * it can provide info as to whether we are the
893 * one referencing or modifying the page.
894 */
895 m = NULL;
896 object = NULL;
897retry:
898 pa = 0;
899 mincoreinfo = pmap_mincore(pmap, addr, &pa);
900 if (mincore_mapped) {
901 /*
902 * We only care about this pmap's
903 * mapping of the page, if any.
904 */
905 ;
906 } else if (pa != 0) {
907 /*
908 * The page is mapped by this process but not
909 * both accessed and modified. It is also
910 * managed. Acquire the object lock so that
911 * other mappings might be examined. The page's
912 * identity may change at any point before its
913 * object lock is acquired, so re-validate if
914 * necessary.
915 */
916 m = PHYS_TO_VM_PAGE(pa);
917 while (object == NULL || m->object != object) {
918 if (object != NULL)
919 VM_OBJECT_WUNLOCK(object);
920 object = atomic_load_ptr(&m->object);
921 if (object == NULL)
922 goto retry;
923 VM_OBJECT_WLOCK(object);
924 }
925 if (pa != pmap_extract(pmap, addr))
926 goto retry;
927 KASSERT(vm_page_all_valid(m),
928 ("mincore: page %p is mapped but invalid",
929 m));
930 } else if (mincoreinfo == 0) {
931 /*
932 * The page is not mapped by this process. If
933 * the object implements managed pages, then
934 * determine if the page is resident so that
935 * the mappings might be examined.
936 */
937 if (current->object.vm_object != object) {
938 if (object != NULL)
939 VM_OBJECT_WUNLOCK(object);
940 object = current->object.vm_object;
941 VM_OBJECT_WLOCK(object);
942 }
943 if (object->type == OBJT_DEFAULT ||
944 (object->flags & OBJ_SWAP) != 0 ||
945 object->type == OBJT_VNODE) {
946 pindex = OFF_TO_IDX(current->offset +
947 (addr - current->start));
948 m = vm_page_lookup(object, pindex);
949 if (m != NULL && vm_page_none_valid(m))
950 m = NULL;
951 if (m != NULL)
952 mincoreinfo = MINCORE_INCORE;
953 }
954 }
955 if (m != NULL) {
956 VM_OBJECT_ASSERT_WLOCKED(m->object);
957
958 /* Examine other mappings of the page. */
959 if (m->dirty == 0 && pmap_is_modified(m))
960 vm_page_dirty(m);
961 if (m->dirty != 0)
962 mincoreinfo |= MINCORE_MODIFIED_OTHER;
963
964 /*
965 * The first test for PGA_REFERENCED is an
966 * optimization. The second test is
967 * required because a concurrent pmap
968 * operation could clear the last reference
969 * and set PGA_REFERENCED before the call to
970 * pmap_is_referenced().
971 */
972 if ((m->a.flags & PGA_REFERENCED) != 0 ||
974 (m->a.flags & PGA_REFERENCED) != 0)
975 mincoreinfo |= MINCORE_REFERENCED_OTHER;
976 }
977 if (object != NULL)
978 VM_OBJECT_WUNLOCK(object);
979
980 /*
981 * subyte may page fault. In case it needs to modify
982 * the map, we release the lock.
983 */
985
986 /*
987 * calculate index into user supplied byte vector
988 */
989 vecindex = atop(addr - first_addr);
990
991 /*
992 * If we have skipped map entries, we need to make sure that
993 * the byte vector is zeroed for those skipped entries.
994 */
995 while ((lastvecindex + 1) < vecindex) {
996 ++lastvecindex;
997 error = subyte(vec + lastvecindex, 0);
998 if (error) {
999 error = EFAULT;
1000 goto done2;
1001 }
1002 }
1003
1004 /*
1005 * Pass the page information to the user
1006 */
1007 error = subyte(vec + vecindex, mincoreinfo);
1008 if (error) {
1009 error = EFAULT;
1010 goto done2;
1011 }
1012
1013 /*
1014 * If the map has changed, due to the subyte, the previous
1015 * output may be invalid.
1016 */
1017 vm_map_lock_read(map);
1018 if (timestamp != map->timestamp)
1019 goto RestartScan;
1020
1021 lastvecindex = vecindex;
1022 }
1023 }
1024
1025 /*
1026 * subyte may page fault. In case it needs to modify
1027 * the map, we release the lock.
1028 */
1029 vm_map_unlock_read(map);
1030
1031 /*
1032 * Zero the last entries in the byte vector.
1033 */
1034 vecindex = atop(end - first_addr);
1035 while ((lastvecindex + 1) < vecindex) {
1036 ++lastvecindex;
1037 error = subyte(vec + lastvecindex, 0);
1038 if (error) {
1039 error = EFAULT;
1040 goto done2;
1041 }
1042 }
1043
1044 /*
1045 * If the map has changed, due to the subyte, the previous
1046 * output may be invalid.
1047 */
1048 vm_map_lock_read(map);
1049 if (timestamp != map->timestamp)
1050 goto RestartScan;
1051 vm_map_unlock_read(map);
1052done2:
1053 return (error);
1054}
1055
1056#ifndef _SYS_SYSPROTO_H_
1058 const void *addr;
1059 size_t len;
1060};
1061#endif
1062int
1063sys_mlock(struct thread *td, struct mlock_args *uap)
1064{
1065
1066 return (kern_mlock(td->td_proc, td->td_ucred,
1067 __DECONST(uintptr_t, uap->addr), uap->len));
1068}
1069
1070int
1071kern_mlock(struct proc *proc, struct ucred *cred, uintptr_t addr0, size_t len)
1072{
1073 vm_offset_t addr, end, last, start;
1074 vm_size_t npages, size;
1075 vm_map_t map;
1076 unsigned long nsize;
1077 int error;
1078
1079 error = priv_check_cred(cred, PRIV_VM_MLOCK);
1080 if (error)
1081 return (error);
1082 addr = addr0;
1083 size = len;
1084 last = addr + size;
1085 start = trunc_page(addr);
1086 end = round_page(last);
1087 if (last < addr || end < addr)
1088 return (EINVAL);
1089 npages = atop(end - start);
1090 if (npages > vm_page_max_user_wired)
1091 return (ENOMEM);
1092 map = &proc->p_vmspace->vm_map;
1093 PROC_LOCK(proc);
1094 nsize = ptoa(npages + pmap_wired_count(map->pmap));
1095 if (nsize > lim_cur_proc(proc, RLIMIT_MEMLOCK)) {
1096 PROC_UNLOCK(proc);
1097 return (ENOMEM);
1098 }
1099 PROC_UNLOCK(proc);
1100#ifdef RACCT
1101 if (racct_enable) {
1102 PROC_LOCK(proc);
1103 error = racct_set(proc, RACCT_MEMLOCK, nsize);
1104 PROC_UNLOCK(proc);
1105 if (error != 0)
1106 return (ENOMEM);
1107 }
1108#endif
1109 error = vm_map_wire(map, start, end,
1111#ifdef RACCT
1112 if (racct_enable && error != KERN_SUCCESS) {
1113 PROC_LOCK(proc);
1114 racct_set(proc, RACCT_MEMLOCK,
1115 ptoa(pmap_wired_count(map->pmap)));
1116 PROC_UNLOCK(proc);
1117 }
1118#endif
1119 switch (error) {
1120 case KERN_SUCCESS:
1121 return (0);
1123 return (EINVAL);
1124 default:
1125 return (ENOMEM);
1126 }
1127}
1128
1129#ifndef _SYS_SYSPROTO_H_
1131 int how;
1132};
1133#endif
1134
1135int
1136sys_mlockall(struct thread *td, struct mlockall_args *uap)
1137{
1138 vm_map_t map;
1139 int error;
1140
1141 map = &td->td_proc->p_vmspace->vm_map;
1142 error = priv_check(td, PRIV_VM_MLOCK);
1143 if (error)
1144 return (error);
1145
1146 if ((uap->how == 0) || ((uap->how & ~(MCL_CURRENT|MCL_FUTURE)) != 0))
1147 return (EINVAL);
1148
1149 /*
1150 * If wiring all pages in the process would cause it to exceed
1151 * a hard resource limit, return ENOMEM.
1152 */
1153 if (!old_mlock && uap->how & MCL_CURRENT) {
1154 if (map->size > lim_cur(td, RLIMIT_MEMLOCK))
1155 return (ENOMEM);
1156 }
1157#ifdef RACCT
1158 if (racct_enable) {
1159 PROC_LOCK(td->td_proc);
1160 error = racct_set(td->td_proc, RACCT_MEMLOCK, map->size);
1161 PROC_UNLOCK(td->td_proc);
1162 if (error != 0)
1163 return (ENOMEM);
1164 }
1165#endif
1166
1167 if (uap->how & MCL_FUTURE) {
1168 vm_map_lock(map);
1170 vm_map_unlock(map);
1171 error = 0;
1172 }
1173
1174 if (uap->how & MCL_CURRENT) {
1175 /*
1176 * P1003.1-2001 mandates that all currently mapped pages
1177 * will be memory resident and locked (wired) upon return
1178 * from mlockall(). vm_map_wire() will wire pages, by
1179 * calling vm_fault_wire() for each page in the region.
1180 */
1181 error = vm_map_wire(map, vm_map_min(map), vm_map_max(map),
1183 if (error == KERN_SUCCESS)
1184 error = 0;
1185 else if (error == KERN_RESOURCE_SHORTAGE)
1186 error = ENOMEM;
1187 else
1188 error = EAGAIN;
1189 }
1190#ifdef RACCT
1191 if (racct_enable && error != KERN_SUCCESS) {
1192 PROC_LOCK(td->td_proc);
1193 racct_set(td->td_proc, RACCT_MEMLOCK,
1194 ptoa(pmap_wired_count(map->pmap)));
1195 PROC_UNLOCK(td->td_proc);
1196 }
1197#endif
1198
1199 return (error);
1200}
1201
1202#ifndef _SYS_SYSPROTO_H_
1204 register_t dummy;
1205};
1206#endif
1207
1208int
1209sys_munlockall(struct thread *td, struct munlockall_args *uap)
1210{
1211 vm_map_t map;
1212 int error;
1213
1214 map = &td->td_proc->p_vmspace->vm_map;
1215 error = priv_check(td, PRIV_VM_MUNLOCK);
1216 if (error)
1217 return (error);
1218
1219 /* Clear the MAP_WIREFUTURE flag from this vm_map. */
1220 vm_map_lock(map);
1222 vm_map_unlock(map);
1223
1224 /* Forcibly unwire all pages. */
1225 error = vm_map_unwire(map, vm_map_min(map), vm_map_max(map),
1227#ifdef RACCT
1228 if (racct_enable && error == KERN_SUCCESS) {
1229 PROC_LOCK(td->td_proc);
1230 racct_set(td->td_proc, RACCT_MEMLOCK, 0);
1231 PROC_UNLOCK(td->td_proc);
1232 }
1233#endif
1234
1235 return (error);
1236}
1237
1238#ifndef _SYS_SYSPROTO_H_
1240 const void *addr;
1241 size_t len;
1242};
1243#endif
1244int
1245sys_munlock(struct thread *td, struct munlock_args *uap)
1246{
1247
1248 return (kern_munlock(td, (uintptr_t)uap->addr, uap->len));
1249}
1250
1251int
1252kern_munlock(struct thread *td, uintptr_t addr0, size_t size)
1253{
1254 vm_offset_t addr, end, last, start;
1255#ifdef RACCT
1256 vm_map_t map;
1257#endif
1258 int error;
1259
1260 error = priv_check(td, PRIV_VM_MUNLOCK);
1261 if (error)
1262 return (error);
1263 addr = addr0;
1264 last = addr + size;
1265 start = trunc_page(addr);
1266 end = round_page(last);
1267 if (last < addr || end < addr)
1268 return (EINVAL);
1269 error = vm_map_unwire(&td->td_proc->p_vmspace->vm_map, start, end,
1271#ifdef RACCT
1272 if (racct_enable && error == KERN_SUCCESS) {
1273 PROC_LOCK(td->td_proc);
1274 map = &td->td_proc->p_vmspace->vm_map;
1275 racct_set(td->td_proc, RACCT_MEMLOCK,
1276 ptoa(pmap_wired_count(map->pmap)));
1277 PROC_UNLOCK(td->td_proc);
1278 }
1279#endif
1280 return (error == KERN_SUCCESS ? 0 : ENOMEM);
1281}
1282
1283/*
1284 * vm_mmap_vnode()
1285 *
1286 * Helper function for vm_mmap. Perform sanity check specific for mmap
1287 * operations on vnodes.
1288 */
1289int
1290vm_mmap_vnode(struct thread *td, vm_size_t objsize,
1291 vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp,
1292 struct vnode *vp, vm_ooffset_t *foffp, vm_object_t *objp,
1293 boolean_t *writecounted)
1294{
1295 struct vattr va;
1296 vm_object_t obj;
1297 vm_ooffset_t foff;
1298 struct ucred *cred;
1299 int error, flags;
1300 bool writex;
1301
1302 cred = td->td_ucred;
1303 writex = (*maxprotp & VM_PROT_WRITE) != 0 &&
1304 (*flagsp & MAP_SHARED) != 0;
1305 if ((error = vget(vp, LK_SHARED)) != 0)
1306 return (error);
1307 AUDIT_ARG_VNODE1(vp);
1308 foff = *foffp;
1309 flags = *flagsp;
1310 obj = vp->v_object;
1311 if (vp->v_type == VREG) {
1312 /*
1313 * Get the proper underlying object
1314 */
1315 if (obj == NULL) {
1316 error = EINVAL;
1317 goto done;
1318 }
1319 if (obj->type == OBJT_VNODE && obj->handle != vp) {
1320 vput(vp);
1321 vp = (struct vnode *)obj->handle;
1322 /*
1323 * Bypass filesystems obey the mpsafety of the
1324 * underlying fs. Tmpfs never bypasses.
1325 */
1326 error = vget(vp, LK_SHARED);
1327 if (error != 0)
1328 return (error);
1329 }
1330 if (writex) {
1331 *writecounted = TRUE;
1332 vm_pager_update_writecount(obj, 0, objsize);
1333 }
1334 } else {
1335 error = EINVAL;
1336 goto done;
1337 }
1338 if ((error = VOP_GETATTR(vp, &va, cred)))
1339 goto done;
1340#ifdef MAC
1341 /* This relies on VM_PROT_* matching PROT_*. */
1342 error = mac_vnode_check_mmap(cred, vp, (int)prot, flags);
1343 if (error != 0)
1344 goto done;
1345#endif
1346 if ((flags & MAP_SHARED) != 0) {
1347 if ((va.va_flags & (SF_SNAPSHOT|IMMUTABLE|APPEND)) != 0) {
1348 if (prot & VM_PROT_WRITE) {
1349 error = EPERM;
1350 goto done;
1351 }
1352 *maxprotp &= ~VM_PROT_WRITE;
1353 }
1354 }
1355 /*
1356 * If it is a regular file without any references
1357 * we do not need to sync it.
1358 * Adjust object size to be the size of actual file.
1359 */
1360 objsize = round_page(va.va_size);
1361 if (va.va_nlink == 0)
1362 flags |= MAP_NOSYNC;
1363 if (obj->type == OBJT_VNODE) {
1364 obj = vm_pager_allocate(OBJT_VNODE, vp, objsize, prot, foff,
1365 cred);
1366 if (obj == NULL) {
1367 error = ENOMEM;
1368 goto done;
1369 }
1370 } else {
1371 KASSERT(obj->type == OBJT_DEFAULT ||
1372 (obj->flags & OBJ_SWAP) != 0,
1373 ("wrong object type"));
1375#if VM_NRESERVLEVEL > 0
1376 if ((obj->flags & OBJ_COLORED) == 0) {
1377 VM_OBJECT_WLOCK(obj);
1378 vm_object_color(obj, 0);
1379 VM_OBJECT_WUNLOCK(obj);
1380 }
1381#endif
1382 }
1383 *objp = obj;
1384 *flagsp = flags;
1385
1386 VOP_MMAPPED(vp);
1387
1388done:
1389 if (error != 0 && *writecounted) {
1390 *writecounted = FALSE;
1391 vm_pager_update_writecount(obj, objsize, 0);
1392 }
1393 vput(vp);
1394 return (error);
1395}
1396
1397/*
1398 * vm_mmap_cdev()
1399 *
1400 * Helper function for vm_mmap. Perform sanity check specific for mmap
1401 * operations on cdevs.
1402 */
1403int
1404vm_mmap_cdev(struct thread *td, vm_size_t objsize, vm_prot_t prot,
1405 vm_prot_t *maxprotp, int *flagsp, struct cdev *cdev, struct cdevsw *dsw,
1406 vm_ooffset_t *foff, vm_object_t *objp)
1407{
1408 vm_object_t obj;
1409 int error, flags;
1410
1411 flags = *flagsp;
1412
1413 if (dsw->d_flags & D_MMAP_ANON) {
1414 *objp = NULL;
1415 *foff = 0;
1416 *maxprotp = VM_PROT_ALL;
1417 *flagsp |= MAP_ANON;
1418 return (0);
1419 }
1420 /*
1421 * cdevs do not provide private mappings of any kind.
1422 */
1423 if ((*maxprotp & VM_PROT_WRITE) == 0 &&
1424 (prot & VM_PROT_WRITE) != 0)
1425 return (EACCES);
1426 if (flags & (MAP_PRIVATE|MAP_COPY))
1427 return (EINVAL);
1428 /*
1429 * Force device mappings to be shared.
1430 */
1431 flags |= MAP_SHARED;
1432#ifdef MAC_XXX
1433 error = mac_cdev_check_mmap(td->td_ucred, cdev, (int)prot);
1434 if (error != 0)
1435 return (error);
1436#endif
1437 /*
1438 * First, try d_mmap_single(). If that is not implemented
1439 * (returns ENODEV), fall back to using the device pager.
1440 * Note that d_mmap_single() must return a reference to the
1441 * object (it needs to bump the reference count of the object
1442 * it returns somehow).
1443 *
1444 * XXX assumes VM_PROT_* == PROT_*
1445 */
1446 error = dsw->d_mmap_single(cdev, foff, objsize, objp, (int)prot);
1447 if (error != ENODEV)
1448 return (error);
1449 obj = vm_pager_allocate(OBJT_DEVICE, cdev, objsize, prot, *foff,
1450 td->td_ucred);
1451 if (obj == NULL)
1452 return (EINVAL);
1453 *objp = obj;
1454 *flagsp = flags;
1455 return (0);
1456}
1457
1458/*
1459 * vm_mmap()
1460 *
1461 * Internal version of mmap used by exec, sys5 shared memory, and
1462 * various device drivers. Handle is either a vnode pointer, a
1463 * character device, or NULL for MAP_ANON.
1464 */
1465int
1466vm_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 (EINVAL);
1478
1479 size = round_page(size);
1480 object = NULL;
1481 writecounted = FALSE;
1482
1483 /*
1484 * Lookup/allocate object.
1485 */
1486 switch (handle_type) {
1487 case OBJT_DEVICE: {
1488 struct cdevsw *dsw;
1489 struct cdev *cdev;
1490 int ref;
1491
1492 cdev = handle;
1493 dsw = dev_refthread(cdev, &ref);
1494 if (dsw == NULL)
1495 return (ENXIO);
1496 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, cdev,
1497 dsw, &foff, &object);
1498 dev_relthread(cdev, ref);
1499 break;
1500 }
1501 case OBJT_VNODE:
1502 error = vm_mmap_vnode(td, size, prot, &maxprot, &flags,
1503 handle, &foff, &object, &writecounted);
1504 break;
1505 case OBJT_DEFAULT:
1506 if (handle == NULL) {
1507 error = 0;
1508 break;
1509 }
1510 /* FALLTHROUGH */
1511 default:
1512 error = EINVAL;
1513 break;
1514 }
1515 if (error)
1516 return (error);
1517
1518 error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object,
1519 foff, writecounted, td);
1520 if (error != 0 && object != NULL) {
1521 /*
1522 * If this mapping was accounted for in the vnode's
1523 * writecount, then undo that now.
1524 */
1525 if (writecounted)
1526 vm_pager_release_writecount(object, 0, size);
1527 vm_object_deallocate(object);
1528 }
1529 return (error);
1530}
1531
1532int
1533kern_mmap_racct_check(struct thread *td, vm_map_t map, vm_size_t size)
1534{
1535 int error;
1536
1537 RACCT_PROC_LOCK(td->td_proc);
1538 if (map->size + size > lim_cur(td, RLIMIT_VMEM)) {
1539 RACCT_PROC_UNLOCK(td->td_proc);
1540 return (ENOMEM);
1541 }
1542 if (racct_set(td->td_proc, RACCT_VMEM, map->size + size)) {
1543 RACCT_PROC_UNLOCK(td->td_proc);
1544 return (ENOMEM);
1545 }
1546 if (!old_mlock && map->flags & MAP_WIREFUTURE) {
1547 if (ptoa(pmap_wired_count(map->pmap)) + size >
1548 lim_cur(td, RLIMIT_MEMLOCK)) {
1549 racct_set_force(td->td_proc, RACCT_VMEM, map->size);
1550 RACCT_PROC_UNLOCK(td->td_proc);
1551 return (ENOMEM);
1552 }
1553 error = racct_set(td->td_proc, RACCT_MEMLOCK,
1554 ptoa(pmap_wired_count(map->pmap)) + size);
1555 if (error != 0) {
1556 racct_set_force(td->td_proc, RACCT_VMEM, map->size);
1557 RACCT_PROC_UNLOCK(td->td_proc);
1558 return (error);
1559 }
1560 }
1561 RACCT_PROC_UNLOCK(td->td_proc);
1562 return (0);
1563}
1564
1565/*
1566 * Internal version of mmap that maps a specific VM object into an
1567 * map. Called by mmap for MAP_ANON, vm_mmap, shm_mmap, and vn_mmap.
1568 */
1569int
1570vm_mmap_object(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
1571 vm_prot_t maxprot, int flags, vm_object_t object, vm_ooffset_t foff,
1572 boolean_t writecounted, struct thread *td)
1573{
1574 vm_offset_t max_addr;
1575 int docow, error, findspace, rv;
1576 bool curmap, fitit;
1577
1578 curmap = map == &td->td_proc->p_vmspace->vm_map;
1579 if (curmap) {
1580 error = kern_mmap_racct_check(td, map, size);
1581 if (error != 0)
1582 return (error);
1583 }
1584
1585 /*
1586 * We currently can only deal with page aligned file offsets.
1587 * The mmap() system call already enforces this by subtracting
1588 * the page offset from the file offset, but checking here
1589 * catches errors in device drivers (e.g. d_single_mmap()
1590 * callbacks) and other internal mapping requests (such as in
1591 * exec).
1592 */
1593 if (foff & PAGE_MASK)
1594 return (EINVAL);
1595
1596 if ((flags & MAP_FIXED) == 0) {
1597 fitit = TRUE;
1598 *addr = round_page(*addr);
1599 } else {
1600 if (*addr != trunc_page(*addr))
1601 return (EINVAL);
1602 fitit = FALSE;
1603 }
1604
1605 if (flags & MAP_ANON) {
1606 if (object != NULL || foff != 0)
1607 return (EINVAL);
1608 docow = 0;
1609 } else if (flags & MAP_PREFAULT_READ)
1610 docow = MAP_PREFAULT;
1611 else
1612 docow = MAP_PREFAULT_PARTIAL;
1613
1614 if ((flags & (MAP_ANON|MAP_SHARED)) == 0)
1615 docow |= MAP_COPY_ON_WRITE;
1616 if (flags & MAP_NOSYNC)
1617 docow |= MAP_DISABLE_SYNCER;
1618 if (flags & MAP_NOCORE)
1619 docow |= MAP_DISABLE_COREDUMP;
1620 /* Shared memory is also shared with children. */
1621 if (flags & MAP_SHARED)
1622 docow |= MAP_INHERIT_SHARE;
1623 if (writecounted)
1624 docow |= MAP_WRITECOUNT;
1625 if (flags & MAP_STACK) {
1626 if (object != NULL)
1627 return (EINVAL);
1628 docow |= MAP_STACK_GROWS_DOWN;
1629 }
1630 if ((flags & MAP_EXCL) != 0)
1631 docow |= MAP_CHECK_EXCL;
1632 if ((flags & MAP_GUARD) != 0)
1633 docow |= MAP_CREATE_GUARD;
1634
1635 if (fitit) {
1636 if ((flags & MAP_ALIGNMENT_MASK) == MAP_ALIGNED_SUPER)
1637 findspace = VMFS_SUPER_SPACE;
1638 else if ((flags & MAP_ALIGNMENT_MASK) != 0)
1639 findspace = VMFS_ALIGNED_SPACE(flags >>
1640 MAP_ALIGNMENT_SHIFT);
1641 else
1642 findspace = VMFS_OPTIMAL_SPACE;
1643 max_addr = 0;
1644#ifdef MAP_32BIT
1645 if ((flags & MAP_32BIT) != 0)
1646 max_addr = MAP_32BIT_MAX_ADDR;
1647#endif
1648 if (curmap) {
1649 rv = vm_map_find_min(map, object, foff, addr, size,
1650 round_page((vm_offset_t)td->td_proc->p_vmspace->
1651 vm_daddr + lim_max(td, RLIMIT_DATA)), max_addr,
1652 findspace, prot, maxprot, docow);
1653 } else {
1654 rv = vm_map_find(map, object, foff, addr, size,
1655 max_addr, findspace, prot, maxprot, docow);
1656 }
1657 } else {
1658 rv = vm_map_fixed(map, object, foff, *addr, size,
1659 prot, maxprot, docow);
1660 }
1661
1662 if (rv == KERN_SUCCESS) {
1663 /*
1664 * If the process has requested that all future mappings
1665 * be wired, then heed this.
1666 */
1667 if ((map->flags & MAP_WIREFUTURE) != 0) {
1668 vm_map_lock(map);
1669 if ((map->flags & MAP_WIREFUTURE) != 0)
1670 (void)vm_map_wire_locked(map, *addr,
1671 *addr + size, VM_MAP_WIRE_USER |
1672 ((flags & MAP_STACK) ? VM_MAP_WIRE_HOLESOK :
1674 vm_map_unlock(map);
1675 }
1676 }
1677 return (vm_mmap_to_errno(rv));
1678}
1679
1680/*
1681 * Translate a Mach VM return code to zero on success or the appropriate errno
1682 * on failure.
1683 */
1684int
1686{
1687
1688 switch (rv) {
1689 case KERN_SUCCESS:
1690 return (0);
1692 case KERN_NO_SPACE:
1693 return (ENOMEM);
1695 return (EACCES);
1696 default:
1697 return (EINVAL);
1698 }
1699}
boolean_t pmap_is_referenced(vm_page_t m)
#define pmap_wired_count(pm)
Definition: pmap.h:173
int pmap_mincore(pmap_t pmap, vm_offset_t addr, vm_paddr_t *pap)
boolean_t pmap_is_modified(vm_page_t m)
vm_paddr_t pmap_extract(pmap_t pmap, vm_offset_t va)
size_t len
Definition: vm_mmap.c:753
void * addr
Definition: vm_mmap.c:752
const void * addr
Definition: vm_mmap.c:806
char * vec
Definition: vm_mmap.c:808
size_t len
Definition: vm_mmap.c:807
void * addr
Definition: vm_mmap.c:709
size_t len
Definition: vm_mmap.c:710
size_t len
Definition: vm_mmap.c:1059
const void * addr
Definition: vm_mmap.c:1058
int flags
Definition: vm_mmap.c:171
size_t len
Definition: vm_mmap.c:169
long pad
Definition: vm_mmap.c:173
off_t pos
Definition: vm_mmap.c:174
void * addr
Definition: vm_mmap.c:168
int fd
Definition: vm_mmap.c:172
int prot
Definition: vm_mmap.c:170
size_t len
Definition: vm_mmap.c:651
const void * addr
Definition: vm_mmap.c:650
void * addr
Definition: vm_mmap.c:518
int flags
Definition: vm_mmap.c:520
size_t len
Definition: vm_mmap.c:519
const void * addr
Definition: vm_mmap.c:1240
size_t len
Definition: vm_mmap.c:1241
register_t dummy
Definition: vm_mmap.c:1204
size_t len
Definition: vm_mmap.c:573
void * addr
Definition: vm_mmap.c:572
int incr
Definition: vm_mmap.c:119
int incr
Definition: vm_mmap.c:132
Definition: vm_map.h:101
vm_eflags_t eflags
Definition: vm_map.h:110
union vm_map_object object
Definition: vm_map.h:108
vm_ooffset_t offset
Definition: vm_map.h:109
vm_offset_t start
Definition: vm_map.h:104
vm_offset_t end
Definition: vm_map.h:105
Definition: vm_map.h:197
vm_size_t size
Definition: vm_map.h:202
u_int timestamp
Definition: vm_map.h:203
pmap_t pmap
Definition: vm_map.h:208
vm_flags_t flags
Definition: vm_map.h:206
objtype_t type
Definition: vm_object.h:114
u_short flags
Definition: vm_object.h:115
caddr_t vm_taddr
Definition: vm_map.h:288
struct vm_map vm_map
Definition: vm_map.h:282
caddr_t vm_daddr
Definition: vm_map.h:289
struct vm_object * vm_object
Definition: vm_map.h:91
#define VM_PROT_WRITE
Definition: vm.h:80
u_char objtype_t
Definition: vm.h:102
char vm_inherit_t
Definition: vm.h:68
u_char vm_prot_t
Definition: vm.h:76
#define VM_PROT_NONE
Definition: vm.h:78
@ OBJT_DEFAULT
Definition: vm.h:92
@ OBJT_VNODE
Definition: vm.h:94
@ OBJT_DEVICE
Definition: vm.h:95
#define VM_PROT_EXECUTE
Definition: vm.h:81
#define VM_PROT_ALL
Definition: vm.h:87
int vm_map_find_min(vm_map_t map, vm_object_t object, vm_ooffset_t offset, vm_offset_t *addr, vm_size_t length, vm_offset_t min_addr, vm_offset_t max_addr, int find_space, vm_prot_t prot, vm_prot_t max, int cow)
Definition: vm_map.c:2241
int vm_map_protect(vm_map_t map, vm_offset_t start, vm_offset_t end, vm_prot_t new_prot, vm_prot_t new_maxprot, int flags)
Definition: vm_map.c:2699
int vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end, int flags)
Definition: vm_map.c:3408
int vm_map_madvise(vm_map_t map, vm_offset_t start, vm_offset_t end, int behav)
Definition: vm_map.c:2910
int vm_map_inherit(vm_map_t map, vm_offset_t start, vm_offset_t end, vm_inherit_t new_inheritance)
Definition: vm_map.c:3108
int vm_map_wire_locked(vm_map_t map, vm_offset_t start, vm_offset_t end, int flags)
Definition: vm_map.c:3425
int vm_map_sync(vm_map_t map, vm_offset_t start, vm_offset_t end, boolean_t syncio, boolean_t invalidate)
Definition: vm_map.c:3675
boolean_t vm_map_lookup_entry(vm_map_t map, vm_offset_t address, vm_map_entry_t *entry)
Definition: vm_map.c:1522
int vm_map_find(vm_map_t map, vm_object_t object, vm_ooffset_t offset, vm_offset_t *addr, vm_size_t length, vm_offset_t max_addr, int find_space, vm_prot_t prot, vm_prot_t max, int cow)
Definition: vm_map.c:2083
boolean_t vm_map_check_protection(vm_map_t map, vm_offset_t start, vm_offset_t end, vm_prot_t protection)
Definition: vm_map.c:4012
int vm_map_fixed(vm_map_t map, vm_object_t object, vm_ooffset_t offset, vm_offset_t start, vm_size_t length, vm_prot_t prot, vm_prot_t max, int cow)
Definition: vm_map.c:1937
int vm_map_delete(vm_map_t map, vm_offset_t start, vm_offset_t end)
Definition: vm_map.c:3893
int vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end, int flags)
Definition: vm_map.c:3215
static __inline void vm_map_modflags(vm_map_t map, vm_flags_t set, vm_flags_t clear)
Definition: vm_map.h:257
#define VM_MAP_WIRE_USER
Definition: vm_map.h:414
#define MAP_CHECK_EXCL
Definition: vm_map.h:365
#define MAP_STACK_GROWS_DOWN
Definition: vm_map.h:371
#define vm_map_unlock_read(map)
Definition: vm_map.h:344
#define VMFS_OPTIMAL_SPACE
Definition: vm_map.h:406
#define VMFS_ALIGNED_SPACE(x)
Definition: vm_map.h:408
#define VM_MAP_WIRE_HOLESOK
Definition: vm_map.h:417
static __inline vm_offset_t vm_map_max(const struct vm_map *map)
Definition: vm_map.h:237
#define MAP_ENTRY_IS_SUB_MAP
Definition: vm_map.h:121
static bool vm_map_range_valid(vm_map_t map, vm_offset_t start, vm_offset_t end)
Definition: vm_map.h:263
#define vm_map_lock_read(map)
Definition: vm_map.h:343
#define MAP_WIREFUTURE
Definition: vm_map.h:219
#define MAP_WRITECOUNT
Definition: vm_map.h:369
#define MAP_INHERIT_SHARE
Definition: vm_map.h:359
#define MAP_DISABLE_SYNCER
Definition: vm_map.h:364
#define MAP_COPY_ON_WRITE
Definition: vm_map.h:360
#define VM_MAP_PROTECT_SET_PROT
Definition: vm_map.h:510
#define vm_map_lock_downgrade(map)
Definition: vm_map.h:350
#define MAP_CREATE_GUARD
Definition: vm_map.h:366
#define vm_map_lock(map)
Definition: vm_map.h:339
#define VMFS_SUPER_SPACE
Definition: vm_map.h:407
static __inline pmap_t vmspace_pmap(struct vmspace *vmspace)
Definition: vm_map.h:303
#define MAP_PREFAULT_PARTIAL
Definition: vm_map.h:363
#define MAP_PREFAULT
Definition: vm_map.h:362
#define VM_MAP_WIRE_NOHOLES
Definition: vm_map.h:416
static __inline vm_offset_t vm_map_min(const struct vm_map *map)
Definition: vm_map.h:244
static vm_map_entry_t vm_map_entry_succ(vm_map_entry_t entry)
Definition: vm_map.h:492
#define vm_map_unlock(map)
Definition: vm_map.h:340
#define VM_MAP_PROTECT_SET_MAXPROT
Definition: vm_map.h:511
#define MAP_DISABLE_COREDUMP
Definition: vm_map.h:367
int kern_mmap(struct thread *td, const struct mmap_req *mrp)
Definition: vm_mmap.c:206
int old_mlock
Definition: vm_mmap.c:101
int kern_mmap_racct_check(struct thread *td, vm_map_t map, vm_size_t size)
Definition: vm_mmap.c:1533
int kern_madvise(struct thread *td, uintptr_t addr0, size_t len, int behav)
Definition: vm_mmap.c:766
int sys_munlockall(struct thread *td, struct munlockall_args *uap)
Definition: vm_mmap.c:1209
int sys_mlockall(struct thread *td, struct mlockall_args *uap)
Definition: vm_mmap.c:1136
int kern_mincore(struct thread *td, uintptr_t addr0, size_t len, char *vec)
Definition: vm_mmap.c:820
static int mincore_mapped
Definition: vm_mmap.c:104
_Static_assert(MAXPAGESIZES<=4, "MINCORE_SUPER too narrow")
int sys_sbrk(struct thread *td, struct sbrk_args *uap)
Definition: vm_mmap.c:124
static int imply_prot_max
Definition: vm_mmap.c:107
int sys_mlock(struct thread *td, struct mlock_args *uap)
Definition: vm_mmap.c:1063
int sys_sstk(struct thread *td, struct sstk_args *uap)
Definition: vm_mmap.c:137
int vm_mmap_cdev(struct thread *td, vm_size_t objsize, vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp, struct cdev *cdev, struct cdevsw *dsw, vm_ooffset_t *foff, vm_object_t *objp)
Definition: vm_mmap.c:1404
int vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot, vm_prot_t maxprot, int flags, objtype_t handle_type, void *handle, vm_ooffset_t foff)
Definition: vm_mmap.c:1466
SYSCTL_INT(_vm, OID_AUTO, old_mlock, CTLFLAG_RWTUN, &old_mlock, 0, "Do not apply RLIMIT_MEMLOCK on mlockall")
int vm_mmap_to_errno(int rv)
Definition: vm_mmap.c:1685
int kern_msync(struct thread *td, uintptr_t addr0, size_t size, int flags)
Definition: vm_mmap.c:531
int kern_munlock(struct thread *td, uintptr_t addr0, size_t size)
Definition: vm_mmap.c:1252
int sys_mincore(struct thread *td, struct mincore_args *uap)
Definition: vm_mmap.c:813
int sys_minherit(struct thread *td, struct minherit_args *uap)
Definition: vm_mmap.c:715
int kern_mlock(struct proc *proc, struct ucred *cred, uintptr_t addr0, size_t len)
Definition: vm_mmap.c:1071
__FBSDID("$FreeBSD$")
int sys_mmap(struct thread *td, struct mmap_args *uap)
Definition: vm_mmap.c:179
int kern_minherit(struct thread *td, uintptr_t addr0, size_t len, int inherit0)
Definition: vm_mmap.c:723
int sys_madvise(struct thread *td, struct madvise_args *uap)
Definition: vm_mmap.c:759
int sys_mprotect(struct thread *td, struct mprotect_args *uap)
Definition: vm_mmap.c:656
int vm_mmap_object(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot, vm_prot_t maxprot, int flags, vm_object_t object, vm_ooffset_t foff, boolean_t writecounted, struct thread *td)
Definition: vm_mmap.c:1570
int kern_mprotect(struct thread *td, uintptr_t addr0, size_t size, int prot)
Definition: vm_mmap.c:663
int kern_mmap_maxprot(struct proc *p, int prot)
Definition: vm_mmap.c:193
int sys_munmap(struct thread *td, struct munmap_args *uap)
Definition: vm_mmap.c:577
int kern_munmap(struct thread *td, uintptr_t addr0, size_t size)
Definition: vm_mmap.c:584
int sys_munlock(struct thread *td, struct munlock_args *uap)
Definition: vm_mmap.c:1245
int vm_mmap_vnode(struct thread *td, vm_size_t objsize, vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp, struct vnode *vp, vm_ooffset_t *foffp, vm_object_t *objp, boolean_t *writecounted)
Definition: vm_mmap.c:1290
int sys_msync(struct thread *td, struct msync_args *uap)
Definition: vm_mmap.c:524
void vm_object_reference(vm_object_t object)
Definition: vm_object.c:504
void vm_object_deallocate(vm_object_t object)
Definition: vm_object.c:625
#define OBJ_COLORED
Definition: vm_object.h:208
static __inline void vm_object_color(vm_object_t object, u_short color)
Definition: vm_object.h:315
#define VM_OBJECT_WLOCK(object)
Definition: vm_object.h:270
#define OBJ_SWAP
Definition: vm_object.h:205
#define OFF_TO_IDX(off)
Definition: vm_object.h:221
#define VM_OBJECT_WUNLOCK(object)
Definition: vm_object.h:274
#define VM_OBJECT_ASSERT_WLOCKED(object)
Definition: vm_object.h:252
vm_page_t PHYS_TO_VM_PAGE(vm_paddr_t pa)
Definition: vm_page.c:1221
vm_page_t vm_page_lookup(vm_object_t object, vm_pindex_t pindex)
Definition: vm_page.c:1627
static bool vm_page_all_valid(vm_page_t m)
Definition: vm_page.h:990
#define PGA_REFERENCED
Definition: vm_page.h:438
static bool vm_page_none_valid(vm_page_t m)
Definition: vm_page.h:997
static __inline void vm_page_dirty(vm_page_t m)
Definition: vm_page.h:885
u_long vm_page_max_user_wired
Definition: vm_pageout.c:204
vm_object_t vm_pager_allocate(objtype_t type, void *handle, vm_ooffset_t size, vm_prot_t prot, vm_ooffset_t off, struct ucred *cred)
Definition: vm_pager.c:259
static __inline void vm_pager_update_writecount(vm_object_t object, vm_offset_t start, vm_offset_t end)
Definition: vm_pager.h:207
static __inline void vm_pager_release_writecount(vm_object_t object, vm_offset_t start, vm_offset_t end)
Definition: vm_pager.h:218
#define KERN_RESOURCE_SHORTAGE
Definition: vm_param.h:113
#define KERN_SUCCESS
Definition: vm_param.h:107
#define KERN_PROTECTION_FAILURE
Definition: vm_param.h:109
#define KERN_FAILURE
Definition: vm_param.h:112
#define KERN_OUT_OF_BOUNDS
Definition: vm_param.h:116
#define KERN_NO_SPACE
Definition: vm_param.h:110
#define KERN_INVALID_ADDRESS
Definition: vm_param.h:108
#define KERN_INVALID_ARGUMENT
Definition: vm_param.h:111