249645144d
have pv_entries. This is intended for very special circumstances, eg: a certain database that has a 1GB shm segment mapped into 300 processes. That would consume 2GB of kvm just to hold the pv_entries alone. This would not be used on systems unless the physical ram was available, as it's not pageable. This is a work-in-progress, but is a useful and functional checkpoint. Matt has got some more fixes for it that will be committed soon. Reviewed by: dillon
1163 lines
26 KiB
C
1163 lines
26 KiB
C
/*
|
|
* Copyright (c) 1988 University of Utah.
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* the Systems Programming Group of the University of Utah Computer
|
|
* Science Department.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$
|
|
*
|
|
* @(#)vm_mmap.c 8.4 (Berkeley) 1/12/94
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* Mapped file (mmap) interface to VM
|
|
*/
|
|
|
|
#include "opt_compat.h"
|
|
#include "opt_rlimit.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/sysproto.h>
|
|
#include <sys/filedesc.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/file.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/vmmeter.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_param.h>
|
|
#include <sys/lock.h>
|
|
#include <vm/pmap.h>
|
|
#include <vm/vm_map.h>
|
|
#include <vm/vm_object.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/vm_pager.h>
|
|
#include <vm/vm_pageout.h>
|
|
#include <vm/vm_extern.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/vm_kern.h>
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct sbrk_args {
|
|
int incr;
|
|
};
|
|
#endif
|
|
|
|
static int max_proc_mmap;
|
|
SYSCTL_INT(_vm, OID_AUTO, max_proc_mmap, CTLFLAG_RW, &max_proc_mmap, 0, "");
|
|
|
|
/*
|
|
* Set the maximum number of vm_map_entry structures per process. Roughly
|
|
* speaking vm_map_entry structures are tiny, so allowing them to eat 1/100
|
|
* of our KVM malloc space still results in generous limits. We want a
|
|
* default that is good enough to prevent the kernel running out of resources
|
|
* if attacked from compromised user account but generous enough such that
|
|
* multi-threaded processes are not unduly inconvenienced.
|
|
*/
|
|
|
|
static void vmmapentry_rsrc_init __P((void *));
|
|
SYSINIT(vmmersrc, SI_SUB_KVM_RSRC, SI_ORDER_FIRST, vmmapentry_rsrc_init, NULL)
|
|
|
|
static void
|
|
vmmapentry_rsrc_init(dummy)
|
|
void *dummy;
|
|
{
|
|
max_proc_mmap = vm_kmem_size / sizeof(struct vm_map_entry);
|
|
max_proc_mmap /= 100;
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
sbrk(p, uap)
|
|
struct proc *p;
|
|
struct sbrk_args *uap;
|
|
{
|
|
|
|
/* Not yet implemented */
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct sstk_args {
|
|
int incr;
|
|
};
|
|
#endif
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
sstk(p, uap)
|
|
struct proc *p;
|
|
struct sstk_args *uap;
|
|
{
|
|
|
|
/* Not yet implemented */
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct getpagesize_args {
|
|
int dummy;
|
|
};
|
|
#endif
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
ogetpagesize(p, uap)
|
|
struct proc *p;
|
|
struct getpagesize_args *uap;
|
|
{
|
|
|
|
p->p_retval[0] = PAGE_SIZE;
|
|
return (0);
|
|
}
|
|
#endif /* COMPAT_43 || COMPAT_SUNOS */
|
|
|
|
|
|
/*
|
|
* Memory Map (mmap) system call. Note that the file offset
|
|
* and address are allowed to be NOT page aligned, though if
|
|
* the MAP_FIXED flag it set, both must have the same remainder
|
|
* modulo the PAGE_SIZE (POSIX 1003.1b). If the address is not
|
|
* page-aligned, the actual mapping starts at trunc_page(addr)
|
|
* and the return value is adjusted up by the page offset.
|
|
*
|
|
* Generally speaking, only character devices which are themselves
|
|
* memory-based, such as a video framebuffer, can be mmap'd. Otherwise
|
|
* there would be no cache coherency between a descriptor and a VM mapping
|
|
* both to the same character device.
|
|
*
|
|
* Block devices can be mmap'd no matter what they represent. Cache coherency
|
|
* is maintained as long as you do not write directly to the underlying
|
|
* character device.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct mmap_args {
|
|
void *addr;
|
|
size_t len;
|
|
int prot;
|
|
int flags;
|
|
int fd;
|
|
long pad;
|
|
off_t pos;
|
|
};
|
|
#endif
|
|
|
|
int
|
|
mmap(p, uap)
|
|
struct proc *p;
|
|
register struct mmap_args *uap;
|
|
{
|
|
register struct filedesc *fdp = p->p_fd;
|
|
register struct file *fp;
|
|
struct vnode *vp;
|
|
vm_offset_t addr;
|
|
vm_size_t size, pageoff;
|
|
vm_prot_t prot, maxprot;
|
|
void *handle;
|
|
int flags, error;
|
|
int disablexworkaround;
|
|
off_t pos;
|
|
struct vmspace *vms = p->p_vmspace;
|
|
|
|
addr = (vm_offset_t) uap->addr;
|
|
size = uap->len;
|
|
prot = uap->prot & VM_PROT_ALL;
|
|
flags = uap->flags;
|
|
pos = uap->pos;
|
|
|
|
/* make sure mapping fits into numeric range etc */
|
|
if ((ssize_t) uap->len < 0 ||
|
|
((flags & MAP_ANON) && uap->fd != -1))
|
|
return (EINVAL);
|
|
|
|
if (flags & MAP_STACK) {
|
|
if ((uap->fd != -1) ||
|
|
((prot & (PROT_READ | PROT_WRITE)) != (PROT_READ | PROT_WRITE)))
|
|
return (EINVAL);
|
|
flags |= MAP_ANON;
|
|
pos = 0;
|
|
}
|
|
|
|
/*
|
|
* Align the file position to a page boundary,
|
|
* and save its page offset component.
|
|
*/
|
|
pageoff = (pos & PAGE_MASK);
|
|
pos -= pageoff;
|
|
|
|
/* Adjust size for rounding (on both ends). */
|
|
size += pageoff; /* low end... */
|
|
size = (vm_size_t) round_page(size); /* hi end */
|
|
|
|
/*
|
|
* Check for illegal addresses. Watch out for address wrap... Note
|
|
* that VM_*_ADDRESS are not constants due to casts (argh).
|
|
*/
|
|
if (flags & MAP_FIXED) {
|
|
/*
|
|
* The specified address must have the same remainder
|
|
* as the file offset taken modulo PAGE_SIZE, so it
|
|
* should be aligned after adjustment by pageoff.
|
|
*/
|
|
addr -= pageoff;
|
|
if (addr & PAGE_MASK)
|
|
return (EINVAL);
|
|
/* Address range must be all in user VM space. */
|
|
if (VM_MAXUSER_ADDRESS > 0 && addr + size > VM_MAXUSER_ADDRESS)
|
|
return (EINVAL);
|
|
#ifndef i386
|
|
if (VM_MIN_ADDRESS > 0 && addr < VM_MIN_ADDRESS)
|
|
return (EINVAL);
|
|
#endif
|
|
if (addr + size < addr)
|
|
return (EINVAL);
|
|
}
|
|
/*
|
|
* XXX for non-fixed mappings where no hint is provided or
|
|
* the hint would fall in the potential heap space,
|
|
* place it after the end of the largest possible heap.
|
|
*
|
|
* There should really be a pmap call to determine a reasonable
|
|
* location.
|
|
*/
|
|
else if (addr == 0 ||
|
|
(addr >= round_page((vm_offset_t)vms->vm_taddr) &&
|
|
addr < round_page((vm_offset_t)vms->vm_daddr + MAXDSIZ)))
|
|
addr = round_page((vm_offset_t)vms->vm_daddr + MAXDSIZ);
|
|
|
|
if (flags & MAP_ANON) {
|
|
/*
|
|
* Mapping blank space is trivial.
|
|
*/
|
|
handle = NULL;
|
|
maxprot = VM_PROT_ALL;
|
|
pos = 0;
|
|
} else {
|
|
/*
|
|
* Mapping file, get fp for validation. Obtain vnode and make
|
|
* sure it is of appropriate type.
|
|
*/
|
|
if (((unsigned) uap->fd) >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[uap->fd]) == NULL)
|
|
return (EBADF);
|
|
if (fp->f_type != DTYPE_VNODE)
|
|
return (EINVAL);
|
|
/*
|
|
* POSIX shared-memory objects are defined to have
|
|
* kernel persistence, and are not defined to support
|
|
* read(2)/write(2) -- or even open(2). Thus, we can
|
|
* use MAP_ASYNC to trade on-disk coherence for speed.
|
|
* The shm_open(3) library routine turns on the FPOSIXSHM
|
|
* flag to request this behavior.
|
|
*/
|
|
if (fp->f_flag & FPOSIXSHM)
|
|
flags |= MAP_NOSYNC;
|
|
vp = (struct vnode *) fp->f_data;
|
|
if (vp->v_type != VREG && vp->v_type != VCHR)
|
|
return (EINVAL);
|
|
/*
|
|
* XXX hack to handle use of /dev/zero to map anon memory (ala
|
|
* SunOS).
|
|
*/
|
|
if (vp->v_type == VCHR && iszerodev(vp->v_rdev)) {
|
|
handle = NULL;
|
|
maxprot = VM_PROT_ALL;
|
|
flags |= MAP_ANON;
|
|
pos = 0;
|
|
} else {
|
|
/*
|
|
* cdevs does not provide private mappings of any kind.
|
|
*/
|
|
/*
|
|
* However, for XIG X server to continue to work,
|
|
* we should allow the superuser to do it anyway.
|
|
* We only allow it at securelevel < 1.
|
|
* (Because the XIG X server writes directly to video
|
|
* memory via /dev/mem, it should never work at any
|
|
* other securelevel.
|
|
* XXX this will have to go
|
|
*/
|
|
if (securelevel >= 1)
|
|
disablexworkaround = 1;
|
|
else
|
|
disablexworkaround = suser(p);
|
|
if (vp->v_type == VCHR && disablexworkaround &&
|
|
(flags & (MAP_PRIVATE|MAP_COPY)))
|
|
return (EINVAL);
|
|
/*
|
|
* Ensure that file and memory protections are
|
|
* compatible. Note that we only worry about
|
|
* writability if mapping is shared; in this case,
|
|
* current and max prot are dictated by the open file.
|
|
* XXX use the vnode instead? Problem is: what
|
|
* credentials do we use for determination? What if
|
|
* proc does a setuid?
|
|
*/
|
|
maxprot = VM_PROT_EXECUTE; /* ??? */
|
|
if (fp->f_flag & FREAD)
|
|
maxprot |= VM_PROT_READ;
|
|
else if (prot & PROT_READ)
|
|
return (EACCES);
|
|
/*
|
|
* If we are sharing potential changes (either via
|
|
* MAP_SHARED or via the implicit sharing of character
|
|
* device mappings), and we are trying to get write
|
|
* permission although we opened it without asking
|
|
* for it, bail out. Check for superuser, only if
|
|
* we're at securelevel < 1, to allow the XIG X server
|
|
* to continue to work.
|
|
*/
|
|
|
|
if ((flags & MAP_SHARED) != 0 ||
|
|
(vp->v_type == VCHR && disablexworkaround)) {
|
|
if ((fp->f_flag & FWRITE) != 0) {
|
|
struct vattr va;
|
|
if ((error =
|
|
VOP_GETATTR(vp, &va,
|
|
p->p_ucred, p)))
|
|
return (error);
|
|
if ((va.va_flags &
|
|
(IMMUTABLE|APPEND)) == 0)
|
|
maxprot |= VM_PROT_WRITE;
|
|
else if (prot & PROT_WRITE)
|
|
return (EPERM);
|
|
} else if ((prot & PROT_WRITE) != 0)
|
|
return (EACCES);
|
|
} else
|
|
maxprot |= VM_PROT_WRITE;
|
|
|
|
handle = (void *)vp;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Do not allow more then a certain number of vm_map_entry structures
|
|
* per process. Scale with the number of rforks sharing the map
|
|
* to make the limit reasonable for threads.
|
|
*/
|
|
if (max_proc_mmap &&
|
|
vms->vm_map.nentries >= max_proc_mmap * vms->vm_refcnt) {
|
|
return (ENOMEM);
|
|
}
|
|
|
|
error = vm_mmap(&vms->vm_map, &addr, size, prot, maxprot,
|
|
flags, handle, pos);
|
|
if (error == 0)
|
|
p->p_retval[0] = (register_t) (addr + pageoff);
|
|
return (error);
|
|
}
|
|
|
|
#ifdef COMPAT_43
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct ommap_args {
|
|
caddr_t addr;
|
|
int len;
|
|
int prot;
|
|
int flags;
|
|
int fd;
|
|
long pos;
|
|
};
|
|
#endif
|
|
int
|
|
ommap(p, uap)
|
|
struct proc *p;
|
|
register struct ommap_args *uap;
|
|
{
|
|
struct mmap_args nargs;
|
|
static const char cvtbsdprot[8] = {
|
|
0,
|
|
PROT_EXEC,
|
|
PROT_WRITE,
|
|
PROT_EXEC | PROT_WRITE,
|
|
PROT_READ,
|
|
PROT_EXEC | PROT_READ,
|
|
PROT_WRITE | PROT_READ,
|
|
PROT_EXEC | PROT_WRITE | PROT_READ,
|
|
};
|
|
|
|
#define OMAP_ANON 0x0002
|
|
#define OMAP_COPY 0x0020
|
|
#define OMAP_SHARED 0x0010
|
|
#define OMAP_FIXED 0x0100
|
|
#define OMAP_INHERIT 0x0800
|
|
|
|
nargs.addr = uap->addr;
|
|
nargs.len = uap->len;
|
|
nargs.prot = cvtbsdprot[uap->prot & 0x7];
|
|
nargs.flags = 0;
|
|
if (uap->flags & OMAP_ANON)
|
|
nargs.flags |= MAP_ANON;
|
|
if (uap->flags & OMAP_COPY)
|
|
nargs.flags |= MAP_COPY;
|
|
if (uap->flags & OMAP_SHARED)
|
|
nargs.flags |= MAP_SHARED;
|
|
else
|
|
nargs.flags |= MAP_PRIVATE;
|
|
if (uap->flags & OMAP_FIXED)
|
|
nargs.flags |= MAP_FIXED;
|
|
if (uap->flags & OMAP_INHERIT)
|
|
nargs.flags |= MAP_INHERIT;
|
|
nargs.fd = uap->fd;
|
|
nargs.pos = uap->pos;
|
|
return (mmap(p, &nargs));
|
|
}
|
|
#endif /* COMPAT_43 */
|
|
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct msync_args {
|
|
void *addr;
|
|
int len;
|
|
int flags;
|
|
};
|
|
#endif
|
|
int
|
|
msync(p, uap)
|
|
struct proc *p;
|
|
struct msync_args *uap;
|
|
{
|
|
vm_offset_t addr;
|
|
vm_size_t size, pageoff;
|
|
int flags;
|
|
vm_map_t map;
|
|
int rv;
|
|
|
|
addr = (vm_offset_t) uap->addr;
|
|
size = uap->len;
|
|
flags = uap->flags;
|
|
|
|
pageoff = (addr & PAGE_MASK);
|
|
addr -= pageoff;
|
|
size += pageoff;
|
|
size = (vm_size_t) round_page(size);
|
|
if (addr + size < addr)
|
|
return(EINVAL);
|
|
|
|
if ((flags & (MS_ASYNC|MS_INVALIDATE)) == (MS_ASYNC|MS_INVALIDATE))
|
|
return (EINVAL);
|
|
|
|
map = &p->p_vmspace->vm_map;
|
|
|
|
/*
|
|
* XXX Gak! If size is zero we are supposed to sync "all modified
|
|
* pages with the region containing addr". Unfortunately, we don't
|
|
* really keep track of individual mmaps so we approximate by flushing
|
|
* the range of the map entry containing addr. This can be incorrect
|
|
* if the region splits or is coalesced with a neighbor.
|
|
*/
|
|
if (size == 0) {
|
|
vm_map_entry_t entry;
|
|
|
|
vm_map_lock_read(map);
|
|
rv = vm_map_lookup_entry(map, addr, &entry);
|
|
vm_map_unlock_read(map);
|
|
if (rv == FALSE)
|
|
return (EINVAL);
|
|
addr = entry->start;
|
|
size = entry->end - entry->start;
|
|
}
|
|
|
|
/*
|
|
* Clean the pages and interpret the return value.
|
|
*/
|
|
rv = vm_map_clean(map, addr, addr + size, (flags & MS_ASYNC) == 0,
|
|
(flags & MS_INVALIDATE) != 0);
|
|
|
|
switch (rv) {
|
|
case KERN_SUCCESS:
|
|
break;
|
|
case KERN_INVALID_ADDRESS:
|
|
return (EINVAL); /* Sun returns ENOMEM? */
|
|
case KERN_FAILURE:
|
|
return (EIO);
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct munmap_args {
|
|
void *addr;
|
|
size_t len;
|
|
};
|
|
#endif
|
|
int
|
|
munmap(p, uap)
|
|
register struct proc *p;
|
|
register struct munmap_args *uap;
|
|
{
|
|
vm_offset_t addr;
|
|
vm_size_t size, pageoff;
|
|
vm_map_t map;
|
|
|
|
addr = (vm_offset_t) uap->addr;
|
|
size = uap->len;
|
|
|
|
pageoff = (addr & PAGE_MASK);
|
|
addr -= pageoff;
|
|
size += pageoff;
|
|
size = (vm_size_t) round_page(size);
|
|
if (addr + size < addr)
|
|
return(EINVAL);
|
|
|
|
if (size == 0)
|
|
return (0);
|
|
|
|
/*
|
|
* Check for illegal addresses. Watch out for address wrap... Note
|
|
* that VM_*_ADDRESS are not constants due to casts (argh).
|
|
*/
|
|
if (VM_MAXUSER_ADDRESS > 0 && addr + size > VM_MAXUSER_ADDRESS)
|
|
return (EINVAL);
|
|
#ifndef i386
|
|
if (VM_MIN_ADDRESS > 0 && addr < VM_MIN_ADDRESS)
|
|
return (EINVAL);
|
|
#endif
|
|
map = &p->p_vmspace->vm_map;
|
|
/*
|
|
* Make sure entire range is allocated.
|
|
*/
|
|
if (!vm_map_check_protection(map, addr, addr + size, VM_PROT_NONE))
|
|
return (EINVAL);
|
|
/* returns nothing but KERN_SUCCESS anyway */
|
|
(void) vm_map_remove(map, addr, addr + size);
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
munmapfd(p, fd)
|
|
struct proc *p;
|
|
int fd;
|
|
{
|
|
/*
|
|
* XXX should unmap any regions mapped to this file
|
|
*/
|
|
p->p_fd->fd_ofileflags[fd] &= ~UF_MAPPED;
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct mprotect_args {
|
|
const void *addr;
|
|
size_t len;
|
|
int prot;
|
|
};
|
|
#endif
|
|
int
|
|
mprotect(p, uap)
|
|
struct proc *p;
|
|
struct mprotect_args *uap;
|
|
{
|
|
vm_offset_t addr;
|
|
vm_size_t size, pageoff;
|
|
register vm_prot_t prot;
|
|
|
|
addr = (vm_offset_t) uap->addr;
|
|
size = uap->len;
|
|
prot = uap->prot & VM_PROT_ALL;
|
|
#if defined(VM_PROT_READ_IS_EXEC)
|
|
if (prot & VM_PROT_READ)
|
|
prot |= VM_PROT_EXECUTE;
|
|
#endif
|
|
|
|
pageoff = (addr & PAGE_MASK);
|
|
addr -= pageoff;
|
|
size += pageoff;
|
|
size = (vm_size_t) round_page(size);
|
|
if (addr + size < addr)
|
|
return(EINVAL);
|
|
|
|
switch (vm_map_protect(&p->p_vmspace->vm_map, addr, addr + size, prot,
|
|
FALSE)) {
|
|
case KERN_SUCCESS:
|
|
return (0);
|
|
case KERN_PROTECTION_FAILURE:
|
|
return (EACCES);
|
|
}
|
|
return (EINVAL);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct minherit_args {
|
|
void *addr;
|
|
size_t len;
|
|
int inherit;
|
|
};
|
|
#endif
|
|
int
|
|
minherit(p, uap)
|
|
struct proc *p;
|
|
struct minherit_args *uap;
|
|
{
|
|
vm_offset_t addr;
|
|
vm_size_t size, pageoff;
|
|
register vm_inherit_t inherit;
|
|
|
|
addr = (vm_offset_t)uap->addr;
|
|
size = uap->len;
|
|
inherit = uap->inherit;
|
|
|
|
pageoff = (addr & PAGE_MASK);
|
|
addr -= pageoff;
|
|
size += pageoff;
|
|
size = (vm_size_t) round_page(size);
|
|
if (addr + size < addr)
|
|
return(EINVAL);
|
|
|
|
switch (vm_map_inherit(&p->p_vmspace->vm_map, addr, addr+size,
|
|
inherit)) {
|
|
case KERN_SUCCESS:
|
|
return (0);
|
|
case KERN_PROTECTION_FAILURE:
|
|
return (EACCES);
|
|
}
|
|
return (EINVAL);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct madvise_args {
|
|
void *addr;
|
|
size_t len;
|
|
int behav;
|
|
};
|
|
#endif
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
madvise(p, uap)
|
|
struct proc *p;
|
|
struct madvise_args *uap;
|
|
{
|
|
vm_offset_t start, end;
|
|
|
|
/*
|
|
* Check for illegal behavior
|
|
*/
|
|
if (uap->behav < 0 || uap->behav > MADV_CORE)
|
|
return (EINVAL);
|
|
/*
|
|
* Check for illegal addresses. Watch out for address wrap... Note
|
|
* that VM_*_ADDRESS are not constants due to casts (argh).
|
|
*/
|
|
if (VM_MAXUSER_ADDRESS > 0 &&
|
|
((vm_offset_t) uap->addr + uap->len) > VM_MAXUSER_ADDRESS)
|
|
return (EINVAL);
|
|
#ifndef i386
|
|
if (VM_MIN_ADDRESS > 0 && uap->addr < VM_MIN_ADDRESS)
|
|
return (EINVAL);
|
|
#endif
|
|
if (((vm_offset_t) uap->addr + uap->len) < (vm_offset_t) uap->addr)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* Since this routine is only advisory, we default to conservative
|
|
* behavior.
|
|
*/
|
|
start = trunc_page((vm_offset_t) uap->addr);
|
|
end = round_page((vm_offset_t) uap->addr + uap->len);
|
|
|
|
if (vm_map_madvise(&p->p_vmspace->vm_map, start, end, uap->behav))
|
|
return (EINVAL);
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct mincore_args {
|
|
const void *addr;
|
|
size_t len;
|
|
char *vec;
|
|
};
|
|
#endif
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
mincore(p, uap)
|
|
struct proc *p;
|
|
struct mincore_args *uap;
|
|
{
|
|
vm_offset_t addr, first_addr;
|
|
vm_offset_t end, cend;
|
|
pmap_t pmap;
|
|
vm_map_t map;
|
|
char *vec;
|
|
int error;
|
|
int vecindex, lastvecindex;
|
|
register vm_map_entry_t current;
|
|
vm_map_entry_t entry;
|
|
int mincoreinfo;
|
|
unsigned int timestamp;
|
|
|
|
/*
|
|
* Make sure that the addresses presented are valid for user
|
|
* mode.
|
|
*/
|
|
first_addr = addr = trunc_page((vm_offset_t) uap->addr);
|
|
end = addr + (vm_size_t)round_page(uap->len);
|
|
if (VM_MAXUSER_ADDRESS > 0 && end > VM_MAXUSER_ADDRESS)
|
|
return (EINVAL);
|
|
if (end < addr)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* Address of byte vector
|
|
*/
|
|
vec = uap->vec;
|
|
|
|
map = &p->p_vmspace->vm_map;
|
|
pmap = vmspace_pmap(p->p_vmspace);
|
|
|
|
vm_map_lock_read(map);
|
|
RestartScan:
|
|
timestamp = map->timestamp;
|
|
|
|
if (!vm_map_lookup_entry(map, addr, &entry))
|
|
entry = entry->next;
|
|
|
|
/*
|
|
* Do this on a map entry basis so that if the pages are not
|
|
* in the current processes address space, we can easily look
|
|
* up the pages elsewhere.
|
|
*/
|
|
lastvecindex = -1;
|
|
for(current = entry;
|
|
(current != &map->header) && (current->start < end);
|
|
current = current->next) {
|
|
|
|
/*
|
|
* ignore submaps (for now) or null objects
|
|
*/
|
|
if ((current->eflags & MAP_ENTRY_IS_SUB_MAP) ||
|
|
current->object.vm_object == NULL)
|
|
continue;
|
|
|
|
/*
|
|
* limit this scan to the current map entry and the
|
|
* limits for the mincore call
|
|
*/
|
|
if (addr < current->start)
|
|
addr = current->start;
|
|
cend = current->end;
|
|
if (cend > end)
|
|
cend = end;
|
|
|
|
/*
|
|
* scan this entry one page at a time
|
|
*/
|
|
while(addr < cend) {
|
|
/*
|
|
* Check pmap first, it is likely faster, also
|
|
* it can provide info as to whether we are the
|
|
* one referencing or modifying the page.
|
|
*/
|
|
mincoreinfo = pmap_mincore(pmap, addr);
|
|
if (!mincoreinfo) {
|
|
vm_pindex_t pindex;
|
|
vm_ooffset_t offset;
|
|
vm_page_t m;
|
|
/*
|
|
* calculate the page index into the object
|
|
*/
|
|
offset = current->offset + (addr - current->start);
|
|
pindex = OFF_TO_IDX(offset);
|
|
m = vm_page_lookup(current->object.vm_object,
|
|
pindex);
|
|
/*
|
|
* if the page is resident, then gather information about
|
|
* it.
|
|
*/
|
|
if (m) {
|
|
mincoreinfo = MINCORE_INCORE;
|
|
if (m->dirty ||
|
|
pmap_is_modified(m))
|
|
mincoreinfo |= MINCORE_MODIFIED_OTHER;
|
|
if ((m->flags & PG_REFERENCED) ||
|
|
pmap_ts_referenced(m)) {
|
|
vm_page_flag_set(m, PG_REFERENCED);
|
|
mincoreinfo |= MINCORE_REFERENCED_OTHER;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* subyte may page fault. In case it needs to modify
|
|
* the map, we release the lock.
|
|
*/
|
|
vm_map_unlock_read(map);
|
|
|
|
/*
|
|
* calculate index into user supplied byte vector
|
|
*/
|
|
vecindex = OFF_TO_IDX(addr - first_addr);
|
|
|
|
/*
|
|
* If we have skipped map entries, we need to make sure that
|
|
* the byte vector is zeroed for those skipped entries.
|
|
*/
|
|
while((lastvecindex + 1) < vecindex) {
|
|
error = subyte( vec + lastvecindex, 0);
|
|
if (error) {
|
|
return (EFAULT);
|
|
}
|
|
++lastvecindex;
|
|
}
|
|
|
|
/*
|
|
* Pass the page information to the user
|
|
*/
|
|
error = subyte( vec + vecindex, mincoreinfo);
|
|
if (error) {
|
|
return (EFAULT);
|
|
}
|
|
|
|
/*
|
|
* If the map has changed, due to the subyte, the previous
|
|
* output may be invalid.
|
|
*/
|
|
vm_map_lock_read(map);
|
|
if (timestamp != map->timestamp)
|
|
goto RestartScan;
|
|
|
|
lastvecindex = vecindex;
|
|
addr += PAGE_SIZE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* subyte may page fault. In case it needs to modify
|
|
* the map, we release the lock.
|
|
*/
|
|
vm_map_unlock_read(map);
|
|
|
|
/*
|
|
* Zero the last entries in the byte vector.
|
|
*/
|
|
vecindex = OFF_TO_IDX(end - first_addr);
|
|
while((lastvecindex + 1) < vecindex) {
|
|
error = subyte( vec + lastvecindex, 0);
|
|
if (error) {
|
|
return (EFAULT);
|
|
}
|
|
++lastvecindex;
|
|
}
|
|
|
|
/*
|
|
* If the map has changed, due to the subyte, the previous
|
|
* output may be invalid.
|
|
*/
|
|
vm_map_lock_read(map);
|
|
if (timestamp != map->timestamp)
|
|
goto RestartScan;
|
|
vm_map_unlock_read(map);
|
|
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct mlock_args {
|
|
const void *addr;
|
|
size_t len;
|
|
};
|
|
#endif
|
|
int
|
|
mlock(p, uap)
|
|
struct proc *p;
|
|
struct mlock_args *uap;
|
|
{
|
|
vm_offset_t addr;
|
|
vm_size_t size, pageoff;
|
|
int error;
|
|
|
|
addr = (vm_offset_t) uap->addr;
|
|
size = uap->len;
|
|
|
|
pageoff = (addr & PAGE_MASK);
|
|
addr -= pageoff;
|
|
size += pageoff;
|
|
size = (vm_size_t) round_page(size);
|
|
|
|
/* disable wrap around */
|
|
if (addr + size < addr)
|
|
return (EINVAL);
|
|
|
|
if (atop(size) + cnt.v_wire_count > vm_page_max_wired)
|
|
return (EAGAIN);
|
|
|
|
#ifdef pmap_wired_count
|
|
if (size + ptoa(pmap_wired_count(vm_map_pmap(&p->p_vmspace->vm_map))) >
|
|
p->p_rlimit[RLIMIT_MEMLOCK].rlim_cur)
|
|
return (ENOMEM);
|
|
#else
|
|
error = suser(p);
|
|
if (error)
|
|
return (error);
|
|
#endif
|
|
|
|
error = vm_map_user_pageable(&p->p_vmspace->vm_map, addr, addr + size, FALSE);
|
|
return (error == KERN_SUCCESS ? 0 : ENOMEM);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct mlockall_args {
|
|
int how;
|
|
};
|
|
#endif
|
|
|
|
int
|
|
mlockall(p, uap)
|
|
struct proc *p;
|
|
struct mlockall_args *uap;
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct mlockall_args {
|
|
int how;
|
|
};
|
|
#endif
|
|
|
|
int
|
|
munlockall(p, uap)
|
|
struct proc *p;
|
|
struct munlockall_args *uap;
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct munlock_args {
|
|
const void *addr;
|
|
size_t len;
|
|
};
|
|
#endif
|
|
int
|
|
munlock(p, uap)
|
|
struct proc *p;
|
|
struct munlock_args *uap;
|
|
{
|
|
vm_offset_t addr;
|
|
vm_size_t size, pageoff;
|
|
int error;
|
|
|
|
addr = (vm_offset_t) uap->addr;
|
|
size = uap->len;
|
|
|
|
pageoff = (addr & PAGE_MASK);
|
|
addr -= pageoff;
|
|
size += pageoff;
|
|
size = (vm_size_t) round_page(size);
|
|
|
|
/* disable wrap around */
|
|
if (addr + size < addr)
|
|
return (EINVAL);
|
|
|
|
#ifndef pmap_wired_count
|
|
error = suser(p);
|
|
if (error)
|
|
return (error);
|
|
#endif
|
|
|
|
error = vm_map_user_pageable(&p->p_vmspace->vm_map, addr, addr + size, TRUE);
|
|
return (error == KERN_SUCCESS ? 0 : ENOMEM);
|
|
}
|
|
|
|
/*
|
|
* Internal version of mmap.
|
|
* Currently used by mmap, exec, and sys5 shared memory.
|
|
* Handle is either a vnode pointer or NULL for MAP_ANON.
|
|
*/
|
|
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,
|
|
void *handle,
|
|
vm_ooffset_t foff)
|
|
{
|
|
boolean_t fitit;
|
|
vm_object_t object;
|
|
struct vnode *vp = NULL;
|
|
objtype_t type;
|
|
int rv = KERN_SUCCESS;
|
|
vm_ooffset_t objsize;
|
|
int docow;
|
|
struct proc *p = curproc;
|
|
|
|
if (size == 0)
|
|
return (0);
|
|
|
|
objsize = size = round_page(size);
|
|
|
|
/*
|
|
* We currently can only deal with page aligned file offsets.
|
|
* The check is here rather than in the syscall because the
|
|
* kernel calls this function internally for other mmaping
|
|
* operations (such as in exec) and non-aligned offsets will
|
|
* cause pmap inconsistencies...so we want to be sure to
|
|
* disallow this in all cases.
|
|
*/
|
|
if (foff & PAGE_MASK)
|
|
return (EINVAL);
|
|
|
|
if ((flags & MAP_FIXED) == 0) {
|
|
fitit = TRUE;
|
|
*addr = round_page(*addr);
|
|
} else {
|
|
if (*addr != trunc_page(*addr))
|
|
return (EINVAL);
|
|
fitit = FALSE;
|
|
(void) vm_map_remove(map, *addr, *addr + size);
|
|
}
|
|
|
|
/*
|
|
* Lookup/allocate object.
|
|
*/
|
|
if (flags & MAP_ANON) {
|
|
type = OBJT_DEFAULT;
|
|
/*
|
|
* Unnamed anonymous regions always start at 0.
|
|
*/
|
|
if (handle == 0)
|
|
foff = 0;
|
|
} else {
|
|
vp = (struct vnode *) handle;
|
|
if (vp->v_type == VCHR) {
|
|
type = OBJT_DEVICE;
|
|
handle = (void *)(intptr_t)vp->v_rdev;
|
|
} else {
|
|
struct vattr vat;
|
|
int error;
|
|
|
|
error = VOP_GETATTR(vp, &vat, p->p_ucred, p);
|
|
if (error)
|
|
return (error);
|
|
objsize = round_page(vat.va_size);
|
|
type = OBJT_VNODE;
|
|
/*
|
|
* if it is a regular file without any references
|
|
* we do not need to sync it.
|
|
*/
|
|
if (vp->v_type == VREG && vat.va_nlink == 0) {
|
|
flags |= MAP_NOSYNC;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (handle == NULL) {
|
|
object = NULL;
|
|
docow = 0;
|
|
} else {
|
|
object = vm_pager_allocate(type,
|
|
handle, objsize, prot, foff);
|
|
if (object == NULL)
|
|
return (type == OBJT_DEVICE ? EINVAL : ENOMEM);
|
|
docow = MAP_PREFAULT_PARTIAL;
|
|
}
|
|
|
|
/*
|
|
* Force device mappings to be shared.
|
|
*/
|
|
if (type == OBJT_DEVICE || type == OBJT_PHYS) {
|
|
flags &= ~(MAP_PRIVATE|MAP_COPY);
|
|
flags |= MAP_SHARED;
|
|
}
|
|
|
|
if ((flags & (MAP_ANON|MAP_SHARED)) == 0)
|
|
docow |= MAP_COPY_ON_WRITE;
|
|
if (flags & MAP_NOSYNC)
|
|
docow |= MAP_DISABLE_SYNCER;
|
|
if (flags & MAP_NOCORE)
|
|
docow |= MAP_DISABLE_COREDUMP;
|
|
|
|
#if defined(VM_PROT_READ_IS_EXEC)
|
|
if (prot & VM_PROT_READ)
|
|
prot |= VM_PROT_EXECUTE;
|
|
|
|
if (maxprot & VM_PROT_READ)
|
|
maxprot |= VM_PROT_EXECUTE;
|
|
#endif
|
|
|
|
if (fitit) {
|
|
*addr = pmap_addr_hint(object, *addr, size);
|
|
}
|
|
|
|
if (flags & MAP_STACK)
|
|
rv = vm_map_stack (map, *addr, size, prot,
|
|
maxprot, docow);
|
|
else
|
|
rv = vm_map_find(map, object, foff, addr, size, fitit,
|
|
prot, maxprot, docow);
|
|
|
|
if (rv != KERN_SUCCESS) {
|
|
/*
|
|
* Lose the object reference. Will destroy the
|
|
* object if it's an unnamed anonymous mapping
|
|
* or named anonymous without other references.
|
|
*/
|
|
vm_object_deallocate(object);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Shared memory is also shared with children.
|
|
*/
|
|
if (flags & (MAP_SHARED|MAP_INHERIT)) {
|
|
rv = vm_map_inherit(map, *addr, *addr + size, VM_INHERIT_SHARE);
|
|
if (rv != KERN_SUCCESS) {
|
|
(void) vm_map_remove(map, *addr, *addr + size);
|
|
goto out;
|
|
}
|
|
}
|
|
out:
|
|
switch (rv) {
|
|
case KERN_SUCCESS:
|
|
return (0);
|
|
case KERN_INVALID_ADDRESS:
|
|
case KERN_NO_SPACE:
|
|
return (ENOMEM);
|
|
case KERN_PROTECTION_FAILURE:
|
|
return (EACCES);
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
}
|