2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1991, 1993
6 * The Regents of the University of California. All rights reserved.
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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.
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
36 * from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$
38 * @(#)vm_mmap.c 8.4 (Berkeley) 1/12/94
42 * Mapped file (mmap) interface to VM
45 #include <sys/cdefs.h>
46 __FBSDID("$FreeBSD$");
48 #include "opt_hwpmc_hooks.h"
51 #include <sys/param.h>
52 #include <sys/systm.h>
53 #include <sys/capsicum.h>
54 #include <sys/kernel.h>
56 #include <sys/mutex.h>
57 #include <sys/sysproto.h>
58 #include <sys/filedesc.h>
61 #include <sys/procctl.h>
62 #include <sys/racct.h>
63 #include <sys/resource.h>
64 #include <sys/resourcevar.h>
65 #include <sys/rwlock.h>
66 #include <sys/sysctl.h>
67 #include <sys/vnode.h>
68 #include <sys/fcntl.h>
71 #include <sys/mount.h>
74 #include <sys/syscallsubr.h>
75 #include <sys/sysent.h>
76 #include <sys/vmmeter.h>
77 #if defined(__amd64__) || defined(__i386__) /* for i386_read_exec */
78 #include <machine/md_var.h>
81 #include <security/audit/audit.h>
82 #include <security/mac/mac_framework.h>
85 #include <vm/vm_param.h>
87 #include <vm/vm_map.h>
88 #include <vm/vm_object.h>
89 #include <vm/vm_page.h>
90 #include <vm/vm_pager.h>
91 #include <vm/vm_pageout.h>
92 #include <vm/vm_extern.h>
93 #include <vm/vm_page.h>
94 #include <vm/vnode_pager.h>
97 #include <sys/pmckern.h>
101 SYSCTL_INT(_vm, OID_AUTO, old_mlock, CTLFLAG_RWTUN, &old_mlock, 0,
102 "Do not apply RLIMIT_MEMLOCK on mlockall");
103 static int mincore_mapped = 1;
104 SYSCTL_INT(_vm, OID_AUTO, mincore_mapped, CTLFLAG_RWTUN, &mincore_mapped, 0,
105 "mincore reports mappings, not residency");
108 #define MAP_32BIT_MAX_ADDR ((vm_offset_t)1 << 31)
111 #ifndef _SYS_SYSPROTO_H_
118 sys_sbrk(struct thread *td, struct sbrk_args *uap)
120 /* Not yet implemented */
124 #ifndef _SYS_SYSPROTO_H_
131 sys_sstk(struct thread *td, struct sstk_args *uap)
133 /* Not yet implemented */
137 #if defined(COMPAT_43)
139 ogetpagesize(struct thread *td, struct ogetpagesize_args *uap)
142 td->td_retval[0] = PAGE_SIZE;
145 #endif /* COMPAT_43 */
149 * Memory Map (mmap) system call. Note that the file offset
150 * and address are allowed to be NOT page aligned, though if
151 * the MAP_FIXED flag it set, both must have the same remainder
152 * modulo the PAGE_SIZE (POSIX 1003.1b). If the address is not
153 * page-aligned, the actual mapping starts at trunc_page(addr)
154 * and the return value is adjusted up by the page offset.
156 * Generally speaking, only character devices which are themselves
157 * memory-based, such as a video framebuffer, can be mmap'd. Otherwise
158 * there would be no cache coherency between a descriptor and a VM mapping
159 * both to the same character device.
161 #ifndef _SYS_SYSPROTO_H_
174 sys_mmap(struct thread *td, struct mmap_args *uap)
177 return (kern_mmap(td, (uintptr_t)uap->addr, uap->len, uap->prot,
178 uap->flags, uap->fd, uap->pos));
182 kern_mmap(struct thread *td, uintptr_t addr0, size_t size, int prot, int flags,
189 vm_prot_t cap_maxprot;
193 vms = td->td_proc->p_vmspace;
199 * Ignore old flags that used to be defined but did not do anything.
201 flags &= ~(MAP_RESERVED0020 | MAP_RESERVED0040);
204 * Enforce the constraints.
205 * Mapping of length 0 is only allowed for old binaries.
206 * Anonymous mapping shall specify -1 as filedescriptor and
207 * zero position for new code. Be nice to ancient a.out
208 * binaries and correct pos for anonymous mapping, since old
209 * ld.so sometimes issues anonymous map requests with non-zero
212 if (!SV_CURPROC_FLAG(SV_AOUT)) {
213 if ((size == 0 && curproc->p_osrel >= P_OSREL_MAP_ANON) ||
214 ((flags & MAP_ANON) != 0 && (fd != -1 || pos != 0)))
217 if ((flags & MAP_ANON) != 0)
221 if (flags & MAP_STACK) {
223 ((prot & (PROT_READ | PROT_WRITE)) != (PROT_READ | PROT_WRITE)))
228 if ((flags & ~(MAP_SHARED | MAP_PRIVATE | MAP_FIXED | MAP_HASSEMAPHORE |
229 MAP_STACK | MAP_NOSYNC | MAP_ANON | MAP_EXCL | MAP_NOCORE |
230 MAP_PREFAULT_READ | MAP_GUARD |
234 MAP_ALIGNMENT_MASK)) != 0)
236 if ((flags & (MAP_EXCL | MAP_FIXED)) == MAP_EXCL)
238 if ((flags & (MAP_SHARED | MAP_PRIVATE)) == (MAP_SHARED | MAP_PRIVATE))
240 if (prot != PROT_NONE &&
241 (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) != 0)
243 if ((flags & MAP_GUARD) != 0 && (prot != PROT_NONE || fd != -1 ||
244 pos != 0 || (flags & ~(MAP_FIXED | MAP_GUARD | MAP_EXCL |
248 MAP_ALIGNMENT_MASK)) != 0))
252 * Align the file position to a page boundary,
253 * and save its page offset component.
255 pageoff = (pos & PAGE_MASK);
258 /* Adjust size for rounding (on both ends). */
259 size += pageoff; /* low end... */
260 size = (vm_size_t) round_page(size); /* hi end */
262 /* Ensure alignment is at least a page and fits in a pointer. */
263 align = flags & MAP_ALIGNMENT_MASK;
264 if (align != 0 && align != MAP_ALIGNED_SUPER &&
265 (align >> MAP_ALIGNMENT_SHIFT >= sizeof(void *) * NBBY ||
266 align >> MAP_ALIGNMENT_SHIFT < PAGE_SHIFT))
270 * Check for illegal addresses. Watch out for address wrap... Note
271 * that VM_*_ADDRESS are not constants due to casts (argh).
273 if (flags & MAP_FIXED) {
275 * The specified address must have the same remainder
276 * as the file offset taken modulo PAGE_SIZE, so it
277 * should be aligned after adjustment by pageoff.
280 if (addr & PAGE_MASK)
283 /* Address range must be all in user VM space. */
284 if (addr < vm_map_min(&vms->vm_map) ||
285 addr + size > vm_map_max(&vms->vm_map))
287 if (addr + size < addr)
290 if (flags & MAP_32BIT && addr + size > MAP_32BIT_MAX_ADDR)
292 } else if (flags & MAP_32BIT) {
294 * For MAP_32BIT, override the hint if it is too high and
295 * do not bother moving the mapping past the heap (since
296 * the heap is usually above 2GB).
298 if (addr + size > MAP_32BIT_MAX_ADDR)
303 * XXX for non-fixed mappings where no hint is provided or
304 * the hint would fall in the potential heap space,
305 * place it after the end of the largest possible heap.
307 * There should really be a pmap call to determine a reasonable
311 (addr >= round_page((vm_offset_t)vms->vm_taddr) &&
312 addr < round_page((vm_offset_t)vms->vm_daddr +
313 lim_max(td, RLIMIT_DATA))))
314 addr = round_page((vm_offset_t)vms->vm_daddr +
315 lim_max(td, RLIMIT_DATA));
319 * Return success without mapping anything for old
320 * binaries that request a page-aligned mapping of
321 * length 0. For modern binaries, this function
322 * returns an error earlier.
325 } else if ((flags & MAP_GUARD) != 0) {
326 error = vm_mmap_object(&vms->vm_map, &addr, size, VM_PROT_NONE,
327 VM_PROT_NONE, flags, NULL, pos, FALSE, td);
328 } else if ((flags & MAP_ANON) != 0) {
330 * Mapping blank space is trivial.
332 * This relies on VM_PROT_* matching PROT_*.
334 error = vm_mmap_object(&vms->vm_map, &addr, size, prot,
335 VM_PROT_ALL, flags, NULL, pos, FALSE, td);
338 * Mapping file, get fp for validation and don't let the
339 * descriptor disappear on us if we block. Check capability
340 * rights, but also return the maximum rights to be combined
341 * with maxprot later.
343 cap_rights_init(&rights, CAP_MMAP);
344 if (prot & PROT_READ)
345 cap_rights_set(&rights, CAP_MMAP_R);
346 if ((flags & MAP_SHARED) != 0) {
347 if (prot & PROT_WRITE)
348 cap_rights_set(&rights, CAP_MMAP_W);
350 if (prot & PROT_EXEC)
351 cap_rights_set(&rights, CAP_MMAP_X);
352 error = fget_mmap(td, fd, &rights, &cap_maxprot, &fp);
355 if ((flags & (MAP_SHARED | MAP_PRIVATE)) == 0 &&
356 td->td_proc->p_osrel >= P_OSREL_MAP_FSTRICT) {
361 /* This relies on VM_PROT_* matching PROT_*. */
362 error = fo_mmap(fp, &vms->vm_map, &addr, size, prot,
363 cap_maxprot, flags, pos, td);
367 td->td_retval[0] = (register_t) (addr + pageoff);
375 #if defined(COMPAT_FREEBSD6)
377 freebsd6_mmap(struct thread *td, struct freebsd6_mmap_args *uap)
380 return (kern_mmap(td, (uintptr_t)uap->addr, uap->len, uap->prot,
381 uap->flags, uap->fd, uap->pos));
386 #ifndef _SYS_SYSPROTO_H_
397 ommap(struct thread *td, struct ommap_args *uap)
399 static const char cvtbsdprot[8] = {
403 PROT_EXEC | PROT_WRITE,
405 PROT_EXEC | PROT_READ,
406 PROT_WRITE | PROT_READ,
407 PROT_EXEC | PROT_WRITE | PROT_READ,
411 #define OMAP_ANON 0x0002
412 #define OMAP_COPY 0x0020
413 #define OMAP_SHARED 0x0010
414 #define OMAP_FIXED 0x0100
416 prot = cvtbsdprot[uap->prot & 0x7];
417 #ifdef COMPAT_FREEBSD32
418 #if defined(__amd64__)
419 if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32) &&
425 if (uap->flags & OMAP_ANON)
427 if (uap->flags & OMAP_COPY)
429 if (uap->flags & OMAP_SHARED)
432 flags |= MAP_PRIVATE;
433 if (uap->flags & OMAP_FIXED)
435 return (kern_mmap(td, (uintptr_t)uap->addr, uap->len, prot, flags,
438 #endif /* COMPAT_43 */
441 #ifndef _SYS_SYSPROTO_H_
449 sys_msync(struct thread *td, struct msync_args *uap)
452 return (kern_msync(td, (uintptr_t)uap->addr, uap->len, uap->flags));
456 kern_msync(struct thread *td, uintptr_t addr0, size_t size, int flags)
464 pageoff = (addr & PAGE_MASK);
467 size = (vm_size_t) round_page(size);
468 if (addr + size < addr)
471 if ((flags & (MS_ASYNC|MS_INVALIDATE)) == (MS_ASYNC|MS_INVALIDATE))
474 map = &td->td_proc->p_vmspace->vm_map;
477 * Clean the pages and interpret the return value.
479 rv = vm_map_sync(map, addr, addr + size, (flags & MS_ASYNC) == 0,
480 (flags & MS_INVALIDATE) != 0);
484 case KERN_INVALID_ADDRESS:
486 case KERN_INVALID_ARGUMENT:
495 #ifndef _SYS_SYSPROTO_H_
502 sys_munmap(struct thread *td, struct munmap_args *uap)
505 return (kern_munmap(td, (uintptr_t)uap->addr, uap->len));
509 kern_munmap(struct thread *td, uintptr_t addr0, size_t size)
512 struct pmckern_map_out pkm;
513 vm_map_entry_t entry;
524 pageoff = (addr & PAGE_MASK);
527 size = (vm_size_t) round_page(size);
528 if (addr + size < addr)
532 * Check for illegal addresses. Watch out for address wrap...
534 map = &td->td_proc->p_vmspace->vm_map;
535 if (addr < vm_map_min(map) || addr + size > vm_map_max(map))
540 if (PMC_HOOK_INSTALLED(PMC_FN_MUNMAP)) {
543 * Inform hwpmc if the address range being unmapped contains
544 * an executable region.
546 pkm.pm_address = (uintptr_t) NULL;
547 if (vm_map_lookup_entry(map, addr, &entry)) {
548 for (; entry->start < addr + size;
549 entry = entry->next) {
550 if (vm_map_check_protection(map, entry->start,
551 entry->end, VM_PROT_EXECUTE) == TRUE) {
552 pkm.pm_address = (uintptr_t) addr;
553 pkm.pm_size = (size_t) size;
560 vm_map_delete(map, addr, addr + size);
563 if (__predict_false(pmc_handled)) {
564 /* downgrade the lock to prevent a LOR with the pmc-sx lock */
565 vm_map_lock_downgrade(map);
566 if (pkm.pm_address != (uintptr_t) NULL)
567 PMC_CALL_HOOK(td, PMC_FN_MUNMAP, (void *) &pkm);
568 vm_map_unlock_read(map);
573 /* vm_map_delete returns nothing but KERN_SUCCESS anyway */
577 #ifndef _SYS_SYSPROTO_H_
578 struct mprotect_args {
585 sys_mprotect(struct thread *td, struct mprotect_args *uap)
588 return (kern_mprotect(td, (uintptr_t)uap->addr, uap->len, uap->prot));
592 kern_mprotect(struct thread *td, uintptr_t addr0, size_t size, int prot)
598 prot = (prot & VM_PROT_ALL);
599 pageoff = (addr & PAGE_MASK);
602 size = (vm_size_t) round_page(size);
603 #ifdef COMPAT_FREEBSD32
604 if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
605 if (((addr + size) & 0xffffffff) < addr)
609 if (addr + size < addr)
612 switch (vm_map_protect(&td->td_proc->p_vmspace->vm_map, addr,
613 addr + size, prot, FALSE)) {
616 case KERN_PROTECTION_FAILURE:
618 case KERN_RESOURCE_SHORTAGE:
624 #ifndef _SYS_SYSPROTO_H_
625 struct minherit_args {
632 sys_minherit(struct thread *td, struct minherit_args *uap)
635 vm_size_t size, pageoff;
636 vm_inherit_t inherit;
638 addr = (vm_offset_t)uap->addr;
640 inherit = uap->inherit;
642 pageoff = (addr & PAGE_MASK);
645 size = (vm_size_t) round_page(size);
646 if (addr + size < addr)
649 switch (vm_map_inherit(&td->td_proc->p_vmspace->vm_map, addr,
650 addr + size, inherit)) {
653 case KERN_PROTECTION_FAILURE:
659 #ifndef _SYS_SYSPROTO_H_
660 struct madvise_args {
668 sys_madvise(struct thread *td, struct madvise_args *uap)
671 return (kern_madvise(td, (uintptr_t)uap->addr, uap->len, uap->behav));
675 kern_madvise(struct thread *td, uintptr_t addr0, size_t len, int behav)
678 vm_offset_t addr, end, start;
682 * Check for our special case, advising the swap pager we are
685 if (behav == MADV_PROTECT) {
687 return (kern_procctl(td, P_PID, td->td_proc->p_pid,
688 PROC_SPROTECT, &flags));
692 * Check for illegal addresses. Watch out for address wrap... Note
693 * that VM_*_ADDRESS are not constants due to casts (argh).
695 map = &td->td_proc->p_vmspace->vm_map;
697 if (addr < vm_map_min(map) || addr + len > vm_map_max(map))
699 if ((addr + len) < addr)
703 * Since this routine is only advisory, we default to conservative
706 start = trunc_page(addr);
707 end = round_page(addr + len);
710 * vm_map_madvise() checks for illegal values of behav.
712 return (vm_map_madvise(map, start, end, behav));
715 #ifndef _SYS_SYSPROTO_H_
716 struct mincore_args {
724 sys_mincore(struct thread *td, struct mincore_args *uap)
727 return (kern_mincore(td, (uintptr_t)uap->addr, uap->len, uap->vec));
731 kern_mincore(struct thread *td, uintptr_t addr0, size_t len, char *vec)
733 vm_offset_t addr, first_addr;
734 vm_offset_t end, cend;
738 int vecindex, lastvecindex;
739 vm_map_entry_t current;
740 vm_map_entry_t entry;
742 vm_paddr_t locked_pa;
746 unsigned int timestamp;
750 * Make sure that the addresses presented are valid for user
753 first_addr = addr = trunc_page(addr0);
754 end = addr + (vm_size_t)round_page(len);
755 map = &td->td_proc->p_vmspace->vm_map;
756 if (end > vm_map_max(map) || end < addr)
759 pmap = vmspace_pmap(td->td_proc->p_vmspace);
761 vm_map_lock_read(map);
763 timestamp = map->timestamp;
765 if (!vm_map_lookup_entry(map, addr, &entry)) {
766 vm_map_unlock_read(map);
771 * Do this on a map entry basis so that if the pages are not
772 * in the current processes address space, we can easily look
773 * up the pages elsewhere.
776 for (current = entry; current->start < end; current = current->next) {
779 * check for contiguity
781 if (current->end < end && current->next->start > current->end) {
782 vm_map_unlock_read(map);
787 * ignore submaps (for now) or null objects
789 if ((current->eflags & MAP_ENTRY_IS_SUB_MAP) ||
790 current->object.vm_object == NULL)
794 * limit this scan to the current map entry and the
795 * limits for the mincore call
797 if (addr < current->start)
798 addr = current->start;
804 * scan this entry one page at a time
806 while (addr < cend) {
808 * Check pmap first, it is likely faster, also
809 * it can provide info as to whether we are the
810 * one referencing or modifying the page.
816 mincoreinfo = pmap_mincore(pmap, addr, &locked_pa);
817 if (mincore_mapped) {
819 * We only care about this pmap's
820 * mapping of the page, if any.
822 if (locked_pa != 0) {
823 vm_page_unlock(PHYS_TO_VM_PAGE(
826 } else if (locked_pa != 0) {
828 * The page is mapped by this process but not
829 * both accessed and modified. It is also
830 * managed. Acquire the object lock so that
831 * other mappings might be examined.
833 m = PHYS_TO_VM_PAGE(locked_pa);
834 if (m->object != object) {
836 VM_OBJECT_WUNLOCK(object);
838 locked = VM_OBJECT_TRYWLOCK(object);
841 VM_OBJECT_WLOCK(object);
847 KASSERT(m->valid == VM_PAGE_BITS_ALL,
848 ("mincore: page %p is mapped but invalid",
850 } else if (mincoreinfo == 0) {
852 * The page is not mapped by this process. If
853 * the object implements managed pages, then
854 * determine if the page is resident so that
855 * the mappings might be examined.
857 if (current->object.vm_object != object) {
859 VM_OBJECT_WUNLOCK(object);
860 object = current->object.vm_object;
861 VM_OBJECT_WLOCK(object);
863 if (object->type == OBJT_DEFAULT ||
864 object->type == OBJT_SWAP ||
865 object->type == OBJT_VNODE) {
866 pindex = OFF_TO_IDX(current->offset +
867 (addr - current->start));
868 m = vm_page_lookup(object, pindex);
869 if (m != NULL && m->valid == 0)
872 mincoreinfo = MINCORE_INCORE;
876 /* Examine other mappings to the page. */
877 if (m->dirty == 0 && pmap_is_modified(m))
880 mincoreinfo |= MINCORE_MODIFIED_OTHER;
882 * The first test for PGA_REFERENCED is an
883 * optimization. The second test is
884 * required because a concurrent pmap
885 * operation could clear the last reference
886 * and set PGA_REFERENCED before the call to
887 * pmap_is_referenced().
889 if ((m->aflags & PGA_REFERENCED) != 0 ||
890 pmap_is_referenced(m) ||
891 (m->aflags & PGA_REFERENCED) != 0)
892 mincoreinfo |= MINCORE_REFERENCED_OTHER;
895 VM_OBJECT_WUNLOCK(object);
898 * subyte may page fault. In case it needs to modify
899 * the map, we release the lock.
901 vm_map_unlock_read(map);
904 * calculate index into user supplied byte vector
906 vecindex = atop(addr - first_addr);
909 * If we have skipped map entries, we need to make sure that
910 * the byte vector is zeroed for those skipped entries.
912 while ((lastvecindex + 1) < vecindex) {
914 error = subyte(vec + lastvecindex, 0);
922 * Pass the page information to the user
924 error = subyte(vec + vecindex, mincoreinfo);
931 * If the map has changed, due to the subyte, the previous
932 * output may be invalid.
934 vm_map_lock_read(map);
935 if (timestamp != map->timestamp)
938 lastvecindex = vecindex;
944 * subyte may page fault. In case it needs to modify
945 * the map, we release the lock.
947 vm_map_unlock_read(map);
950 * Zero the last entries in the byte vector.
952 vecindex = atop(end - first_addr);
953 while ((lastvecindex + 1) < vecindex) {
955 error = subyte(vec + lastvecindex, 0);
963 * If the map has changed, due to the subyte, the previous
964 * output may be invalid.
966 vm_map_lock_read(map);
967 if (timestamp != map->timestamp)
969 vm_map_unlock_read(map);
974 #ifndef _SYS_SYSPROTO_H_
981 sys_mlock(struct thread *td, struct mlock_args *uap)
984 return (kern_mlock(td->td_proc, td->td_ucred,
985 __DECONST(uintptr_t, uap->addr), uap->len));
989 kern_mlock(struct proc *proc, struct ucred *cred, uintptr_t addr0, size_t len)
991 vm_offset_t addr, end, last, start;
992 vm_size_t npages, size;
997 error = priv_check_cred(cred, PRIV_VM_MLOCK);
1003 start = trunc_page(addr);
1004 end = round_page(last);
1005 if (last < addr || end < addr)
1007 npages = atop(end - start);
1008 if (npages > vm_page_max_wired)
1010 map = &proc->p_vmspace->vm_map;
1012 nsize = ptoa(npages + pmap_wired_count(map->pmap));
1013 if (nsize > lim_cur_proc(proc, RLIMIT_MEMLOCK)) {
1018 if (npages + vm_wire_count() > vm_page_max_wired)
1023 error = racct_set(proc, RACCT_MEMLOCK, nsize);
1029 error = vm_map_wire(map, start, end,
1030 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
1032 if (racct_enable && error != KERN_SUCCESS) {
1034 racct_set(proc, RACCT_MEMLOCK,
1035 ptoa(pmap_wired_count(map->pmap)));
1039 return (error == KERN_SUCCESS ? 0 : ENOMEM);
1042 #ifndef _SYS_SYSPROTO_H_
1043 struct mlockall_args {
1049 sys_mlockall(struct thread *td, struct mlockall_args *uap)
1054 map = &td->td_proc->p_vmspace->vm_map;
1055 error = priv_check(td, PRIV_VM_MLOCK);
1059 if ((uap->how == 0) || ((uap->how & ~(MCL_CURRENT|MCL_FUTURE)) != 0))
1063 * If wiring all pages in the process would cause it to exceed
1064 * a hard resource limit, return ENOMEM.
1066 if (!old_mlock && uap->how & MCL_CURRENT) {
1067 if (map->size > lim_cur(td, RLIMIT_MEMLOCK))
1072 PROC_LOCK(td->td_proc);
1073 error = racct_set(td->td_proc, RACCT_MEMLOCK, map->size);
1074 PROC_UNLOCK(td->td_proc);
1080 if (uap->how & MCL_FUTURE) {
1082 vm_map_modflags(map, MAP_WIREFUTURE, 0);
1087 if (uap->how & MCL_CURRENT) {
1089 * P1003.1-2001 mandates that all currently mapped pages
1090 * will be memory resident and locked (wired) upon return
1091 * from mlockall(). vm_map_wire() will wire pages, by
1092 * calling vm_fault_wire() for each page in the region.
1094 error = vm_map_wire(map, vm_map_min(map), vm_map_max(map),
1095 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK);
1096 error = (error == KERN_SUCCESS ? 0 : EAGAIN);
1099 if (racct_enable && error != KERN_SUCCESS) {
1100 PROC_LOCK(td->td_proc);
1101 racct_set(td->td_proc, RACCT_MEMLOCK,
1102 ptoa(pmap_wired_count(map->pmap)));
1103 PROC_UNLOCK(td->td_proc);
1110 #ifndef _SYS_SYSPROTO_H_
1111 struct munlockall_args {
1117 sys_munlockall(struct thread *td, struct munlockall_args *uap)
1122 map = &td->td_proc->p_vmspace->vm_map;
1123 error = priv_check(td, PRIV_VM_MUNLOCK);
1127 /* Clear the MAP_WIREFUTURE flag from this vm_map. */
1129 vm_map_modflags(map, 0, MAP_WIREFUTURE);
1132 /* Forcibly unwire all pages. */
1133 error = vm_map_unwire(map, vm_map_min(map), vm_map_max(map),
1134 VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK);
1136 if (racct_enable && error == KERN_SUCCESS) {
1137 PROC_LOCK(td->td_proc);
1138 racct_set(td->td_proc, RACCT_MEMLOCK, 0);
1139 PROC_UNLOCK(td->td_proc);
1146 #ifndef _SYS_SYSPROTO_H_
1147 struct munlock_args {
1153 sys_munlock(struct thread *td, struct munlock_args *uap)
1156 return (kern_munlock(td, (uintptr_t)uap->addr, uap->len));
1160 kern_munlock(struct thread *td, uintptr_t addr0, size_t size)
1162 vm_offset_t addr, end, last, start;
1168 error = priv_check(td, PRIV_VM_MUNLOCK);
1173 start = trunc_page(addr);
1174 end = round_page(last);
1175 if (last < addr || end < addr)
1177 error = vm_map_unwire(&td->td_proc->p_vmspace->vm_map, start, end,
1178 VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
1180 if (racct_enable && error == KERN_SUCCESS) {
1181 PROC_LOCK(td->td_proc);
1182 map = &td->td_proc->p_vmspace->vm_map;
1183 racct_set(td->td_proc, RACCT_MEMLOCK,
1184 ptoa(pmap_wired_count(map->pmap)));
1185 PROC_UNLOCK(td->td_proc);
1188 return (error == KERN_SUCCESS ? 0 : ENOMEM);
1194 * Helper function for vm_mmap. Perform sanity check specific for mmap
1195 * operations on vnodes.
1198 vm_mmap_vnode(struct thread *td, vm_size_t objsize,
1199 vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp,
1200 struct vnode *vp, vm_ooffset_t *foffp, vm_object_t *objp,
1201 boolean_t *writecounted)
1207 int error, flags, locktype;
1209 cred = td->td_ucred;
1210 if ((*maxprotp & VM_PROT_WRITE) && (*flagsp & MAP_SHARED))
1211 locktype = LK_EXCLUSIVE;
1213 locktype = LK_SHARED;
1214 if ((error = vget(vp, locktype, td)) != 0)
1216 AUDIT_ARG_VNODE1(vp);
1220 if (vp->v_type == VREG) {
1222 * Get the proper underlying object
1228 if (obj->type == OBJT_VNODE && obj->handle != vp) {
1230 vp = (struct vnode *)obj->handle;
1232 * Bypass filesystems obey the mpsafety of the
1233 * underlying fs. Tmpfs never bypasses.
1235 error = vget(vp, locktype, td);
1239 if (locktype == LK_EXCLUSIVE) {
1240 *writecounted = TRUE;
1241 vnode_pager_update_writecount(obj, 0, objsize);
1247 if ((error = VOP_GETATTR(vp, &va, cred)))
1250 /* This relies on VM_PROT_* matching PROT_*. */
1251 error = mac_vnode_check_mmap(cred, vp, (int)prot, flags);
1255 if ((flags & MAP_SHARED) != 0) {
1256 if ((va.va_flags & (SF_SNAPSHOT|IMMUTABLE|APPEND)) != 0) {
1257 if (prot & VM_PROT_WRITE) {
1261 *maxprotp &= ~VM_PROT_WRITE;
1265 * If it is a regular file without any references
1266 * we do not need to sync it.
1267 * Adjust object size to be the size of actual file.
1269 objsize = round_page(va.va_size);
1270 if (va.va_nlink == 0)
1271 flags |= MAP_NOSYNC;
1272 if (obj->type == OBJT_VNODE) {
1273 obj = vm_pager_allocate(OBJT_VNODE, vp, objsize, prot, foff,
1280 KASSERT(obj->type == OBJT_DEFAULT || obj->type == OBJT_SWAP,
1281 ("wrong object type"));
1282 VM_OBJECT_WLOCK(obj);
1283 vm_object_reference_locked(obj);
1284 #if VM_NRESERVLEVEL > 0
1285 vm_object_color(obj, 0);
1287 VM_OBJECT_WUNLOCK(obj);
1292 vfs_mark_atime(vp, cred);
1295 if (error != 0 && *writecounted) {
1296 *writecounted = FALSE;
1297 vnode_pager_update_writecount(obj, objsize, 0);
1306 * Helper function for vm_mmap. Perform sanity check specific for mmap
1307 * operations on cdevs.
1310 vm_mmap_cdev(struct thread *td, vm_size_t objsize, vm_prot_t prot,
1311 vm_prot_t *maxprotp, int *flagsp, struct cdev *cdev, struct cdevsw *dsw,
1312 vm_ooffset_t *foff, vm_object_t *objp)
1319 if (dsw->d_flags & D_MMAP_ANON) {
1322 *maxprotp = VM_PROT_ALL;
1323 *flagsp |= MAP_ANON;
1327 * cdevs do not provide private mappings of any kind.
1329 if ((*maxprotp & VM_PROT_WRITE) == 0 &&
1330 (prot & VM_PROT_WRITE) != 0)
1332 if (flags & (MAP_PRIVATE|MAP_COPY))
1335 * Force device mappings to be shared.
1337 flags |= MAP_SHARED;
1339 error = mac_cdev_check_mmap(td->td_ucred, cdev, (int)prot);
1344 * First, try d_mmap_single(). If that is not implemented
1345 * (returns ENODEV), fall back to using the device pager.
1346 * Note that d_mmap_single() must return a reference to the
1347 * object (it needs to bump the reference count of the object
1348 * it returns somehow).
1350 * XXX assumes VM_PROT_* == PROT_*
1352 error = dsw->d_mmap_single(cdev, foff, objsize, objp, (int)prot);
1353 if (error != ENODEV)
1355 obj = vm_pager_allocate(OBJT_DEVICE, cdev, objsize, prot, *foff,
1367 * Internal version of mmap used by exec, sys5 shared memory, and
1368 * various device drivers. Handle is either a vnode pointer, a
1369 * character device, or NULL for MAP_ANON.
1372 vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
1373 vm_prot_t maxprot, int flags,
1374 objtype_t handle_type, void *handle,
1378 struct thread *td = curthread;
1380 boolean_t writecounted;
1385 size = round_page(size);
1387 writecounted = FALSE;
1390 * Lookup/allocate object.
1392 switch (handle_type) {
1399 dsw = dev_refthread(cdev, &ref);
1402 error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, cdev,
1403 dsw, &foff, &object);
1404 dev_relthread(cdev, ref);
1408 error = vm_mmap_vnode(td, size, prot, &maxprot, &flags,
1409 handle, &foff, &object, &writecounted);
1412 if (handle == NULL) {
1424 error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object,
1425 foff, writecounted, td);
1426 if (error != 0 && object != NULL) {
1428 * If this mapping was accounted for in the vnode's
1429 * writecount, then undo that now.
1432 vnode_pager_release_writecount(object, 0, size);
1433 vm_object_deallocate(object);
1439 * Internal version of mmap that maps a specific VM object into an
1440 * map. Called by mmap for MAP_ANON, vm_mmap, shm_mmap, and vn_mmap.
1443 vm_mmap_object(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
1444 vm_prot_t maxprot, int flags, vm_object_t object, vm_ooffset_t foff,
1445 boolean_t writecounted, struct thread *td)
1447 boolean_t curmap, fitit;
1448 vm_offset_t max_addr;
1449 int docow, error, findspace, rv;
1451 curmap = map == &td->td_proc->p_vmspace->vm_map;
1453 RACCT_PROC_LOCK(td->td_proc);
1454 if (map->size + size > lim_cur(td, RLIMIT_VMEM)) {
1455 RACCT_PROC_UNLOCK(td->td_proc);
1458 if (racct_set(td->td_proc, RACCT_VMEM, map->size + size)) {
1459 RACCT_PROC_UNLOCK(td->td_proc);
1462 if (!old_mlock && map->flags & MAP_WIREFUTURE) {
1463 if (ptoa(pmap_wired_count(map->pmap)) + size >
1464 lim_cur(td, RLIMIT_MEMLOCK)) {
1465 racct_set_force(td->td_proc, RACCT_VMEM,
1467 RACCT_PROC_UNLOCK(td->td_proc);
1470 error = racct_set(td->td_proc, RACCT_MEMLOCK,
1471 ptoa(pmap_wired_count(map->pmap)) + size);
1473 racct_set_force(td->td_proc, RACCT_VMEM,
1475 RACCT_PROC_UNLOCK(td->td_proc);
1479 RACCT_PROC_UNLOCK(td->td_proc);
1483 * We currently can only deal with page aligned file offsets.
1484 * The mmap() system call already enforces this by subtracting
1485 * the page offset from the file offset, but checking here
1486 * catches errors in device drivers (e.g. d_single_mmap()
1487 * callbacks) and other internal mapping requests (such as in
1490 if (foff & PAGE_MASK)
1493 if ((flags & MAP_FIXED) == 0) {
1495 *addr = round_page(*addr);
1497 if (*addr != trunc_page(*addr))
1502 if (flags & MAP_ANON) {
1503 if (object != NULL || foff != 0)
1506 } else if (flags & MAP_PREFAULT_READ)
1507 docow = MAP_PREFAULT;
1509 docow = MAP_PREFAULT_PARTIAL;
1511 if ((flags & (MAP_ANON|MAP_SHARED)) == 0)
1512 docow |= MAP_COPY_ON_WRITE;
1513 if (flags & MAP_NOSYNC)
1514 docow |= MAP_DISABLE_SYNCER;
1515 if (flags & MAP_NOCORE)
1516 docow |= MAP_DISABLE_COREDUMP;
1517 /* Shared memory is also shared with children. */
1518 if (flags & MAP_SHARED)
1519 docow |= MAP_INHERIT_SHARE;
1521 docow |= MAP_VN_WRITECOUNT;
1522 if (flags & MAP_STACK) {
1525 docow |= MAP_STACK_GROWS_DOWN;
1527 if ((flags & MAP_EXCL) != 0)
1528 docow |= MAP_CHECK_EXCL;
1529 if ((flags & MAP_GUARD) != 0)
1530 docow |= MAP_CREATE_GUARD;
1533 if ((flags & MAP_ALIGNMENT_MASK) == MAP_ALIGNED_SUPER)
1534 findspace = VMFS_SUPER_SPACE;
1535 else if ((flags & MAP_ALIGNMENT_MASK) != 0)
1536 findspace = VMFS_ALIGNED_SPACE(flags >>
1537 MAP_ALIGNMENT_SHIFT);
1539 findspace = VMFS_OPTIMAL_SPACE;
1542 if ((flags & MAP_32BIT) != 0)
1543 max_addr = MAP_32BIT_MAX_ADDR;
1546 rv = vm_map_find_min(map, object, foff, addr, size,
1547 round_page((vm_offset_t)td->td_proc->p_vmspace->
1548 vm_daddr + lim_max(td, RLIMIT_DATA)), max_addr,
1549 findspace, prot, maxprot, docow);
1551 rv = vm_map_find(map, object, foff, addr, size,
1552 max_addr, findspace, prot, maxprot, docow);
1555 rv = vm_map_fixed(map, object, foff, *addr, size,
1556 prot, maxprot, docow);
1559 if (rv == KERN_SUCCESS) {
1561 * If the process has requested that all future mappings
1562 * be wired, then heed this.
1564 if (map->flags & MAP_WIREFUTURE) {
1565 vm_map_wire(map, *addr, *addr + size,
1566 VM_MAP_WIRE_USER | ((flags & MAP_STACK) ?
1567 VM_MAP_WIRE_HOLESOK : VM_MAP_WIRE_NOHOLES));
1570 return (vm_mmap_to_errno(rv));
1574 * Translate a Mach VM return code to zero on success or the appropriate errno
1578 vm_mmap_to_errno(int rv)
1584 case KERN_INVALID_ADDRESS:
1587 case KERN_PROTECTION_FAILURE: