further refinement is required as some device drivers intended to be portable over FreeBSD versions rely on __FreeBSD_version to decide whether to include capability.h. MFC after: 3 weeks
1692 lines
39 KiB
C
1692 lines
39 KiB
C
/*-
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$
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*
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* @(#)vm_mmap.c 8.4 (Berkeley) 1/12/94
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*/
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/*
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* Mapped file (mmap) interface to VM
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_compat.h"
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#include "opt_hwpmc_hooks.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/capsicum.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sysproto.h>
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#include <sys/filedesc.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/procctl.h>
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#include <sys/racct.h>
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#include <sys/resource.h>
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#include <sys/resourcevar.h>
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#include <sys/rwlock.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/mman.h>
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#include <sys/mount.h>
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#include <sys/conf.h>
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#include <sys/stat.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysent.h>
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#include <sys/vmmeter.h>
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#include <security/mac/mac_framework.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pager.h>
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#include <vm/vm_pageout.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_page.h>
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#include <vm/vnode_pager.h>
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|
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|
#ifdef HWPMC_HOOKS
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#include <sys/pmckern.h>
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#endif
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|
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int old_mlock = 0;
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SYSCTL_INT(_vm, OID_AUTO, old_mlock, CTLFLAG_RW | CTLFLAG_TUN, &old_mlock, 0,
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"Do not apply RLIMIT_MEMLOCK on mlockall");
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TUNABLE_INT("vm.old_mlock", &old_mlock);
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|
|
|
#ifdef MAP_32BIT
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#define MAP_32BIT_MAX_ADDR ((vm_offset_t)1 << 31)
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#endif
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|
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|
static int vm_mmap_vnode(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *,
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int *, struct vnode *, vm_ooffset_t *, vm_object_t *, boolean_t *);
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static int vm_mmap_cdev(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *,
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int *, struct cdev *, vm_ooffset_t *, vm_object_t *);
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static int vm_mmap_shm(struct thread *, vm_size_t, vm_prot_t, vm_prot_t *,
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int *, struct shmfd *, vm_ooffset_t, vm_object_t *);
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|
#ifndef _SYS_SYSPROTO_H_
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struct sbrk_args {
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int incr;
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};
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#endif
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|
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/*
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* MPSAFE
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*/
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/* ARGSUSED */
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int
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sys_sbrk(td, uap)
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struct thread *td;
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struct sbrk_args *uap;
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{
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/* Not yet implemented */
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return (EOPNOTSUPP);
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}
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|
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|
#ifndef _SYS_SYSPROTO_H_
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struct sstk_args {
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int incr;
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};
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#endif
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|
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|
/*
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* MPSAFE
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*/
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/* ARGSUSED */
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int
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sys_sstk(td, uap)
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struct thread *td;
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|
struct sstk_args *uap;
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{
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/* Not yet implemented */
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return (EOPNOTSUPP);
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}
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|
#if defined(COMPAT_43)
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#ifndef _SYS_SYSPROTO_H_
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struct getpagesize_args {
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int dummy;
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};
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#endif
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|
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|
int
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ogetpagesize(td, uap)
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struct thread *td;
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struct getpagesize_args *uap;
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{
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/* MP SAFE */
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td->td_retval[0] = PAGE_SIZE;
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return (0);
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}
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#endif /* COMPAT_43 */
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|
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/*
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* Memory Map (mmap) system call. Note that the file offset
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* and address are allowed to be NOT page aligned, though if
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* the MAP_FIXED flag it set, both must have the same remainder
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* modulo the PAGE_SIZE (POSIX 1003.1b). If the address is not
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* page-aligned, the actual mapping starts at trunc_page(addr)
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* and the return value is adjusted up by the page offset.
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*
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* Generally speaking, only character devices which are themselves
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* memory-based, such as a video framebuffer, can be mmap'd. Otherwise
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* there would be no cache coherency between a descriptor and a VM mapping
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* both to the same character device.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct mmap_args {
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void *addr;
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size_t len;
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int prot;
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int flags;
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int fd;
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long pad;
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off_t pos;
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};
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#endif
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|
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|
/*
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* MPSAFE
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*/
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int
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sys_mmap(td, uap)
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struct thread *td;
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struct mmap_args *uap;
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{
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#ifdef HWPMC_HOOKS
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struct pmckern_map_in pkm;
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#endif
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struct file *fp;
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struct vnode *vp;
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vm_offset_t addr;
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vm_size_t size, pageoff;
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vm_prot_t cap_maxprot, prot, maxprot;
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void *handle;
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objtype_t handle_type;
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int align, error, flags;
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off_t pos;
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struct vmspace *vms = td->td_proc->p_vmspace;
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cap_rights_t rights;
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addr = (vm_offset_t) uap->addr;
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size = uap->len;
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prot = uap->prot & VM_PROT_ALL;
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flags = uap->flags;
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pos = uap->pos;
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fp = NULL;
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/*
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* Enforce the constraints.
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* Mapping of length 0 is only allowed for old binaries.
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* Anonymous mapping shall specify -1 as filedescriptor and
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* zero position for new code. Be nice to ancient a.out
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* binaries and correct pos for anonymous mapping, since old
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* ld.so sometimes issues anonymous map requests with non-zero
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* pos.
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*/
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if (!SV_CURPROC_FLAG(SV_AOUT)) {
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if ((uap->len == 0 && curproc->p_osrel >= P_OSREL_MAP_ANON) ||
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((flags & MAP_ANON) != 0 && (uap->fd != -1 || pos != 0)))
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return (EINVAL);
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} else {
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if ((flags & MAP_ANON) != 0)
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pos = 0;
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}
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if (flags & MAP_STACK) {
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if ((uap->fd != -1) ||
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((prot & (PROT_READ | PROT_WRITE)) != (PROT_READ | PROT_WRITE)))
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return (EINVAL);
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flags |= MAP_ANON;
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pos = 0;
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}
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/*
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* Align the file position to a page boundary,
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* and save its page offset component.
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*/
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pageoff = (pos & PAGE_MASK);
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pos -= pageoff;
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/* Adjust size for rounding (on both ends). */
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size += pageoff; /* low end... */
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size = (vm_size_t) round_page(size); /* hi end */
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/* Ensure alignment is at least a page and fits in a pointer. */
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align = flags & MAP_ALIGNMENT_MASK;
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if (align != 0 && align != MAP_ALIGNED_SUPER &&
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(align >> MAP_ALIGNMENT_SHIFT >= sizeof(void *) * NBBY ||
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align >> MAP_ALIGNMENT_SHIFT < PAGE_SHIFT))
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return (EINVAL);
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/*
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* Check for illegal addresses. Watch out for address wrap... Note
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* that VM_*_ADDRESS are not constants due to casts (argh).
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*/
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if (flags & MAP_FIXED) {
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/*
|
|
* The specified address must have the same remainder
|
|
* as the file offset taken modulo PAGE_SIZE, so it
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* should be aligned after adjustment by pageoff.
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|
*/
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addr -= pageoff;
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if (addr & PAGE_MASK)
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return (EINVAL);
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|
|
/* Address range must be all in user VM space. */
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if (addr < vm_map_min(&vms->vm_map) ||
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addr + size > vm_map_max(&vms->vm_map))
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return (EINVAL);
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if (addr + size < addr)
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return (EINVAL);
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#ifdef MAP_32BIT
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if (flags & MAP_32BIT && addr + size > MAP_32BIT_MAX_ADDR)
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return (EINVAL);
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} else if (flags & MAP_32BIT) {
|
|
/*
|
|
* For MAP_32BIT, override the hint if it is too high and
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* do not bother moving the mapping past the heap (since
|
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* the heap is usually above 2GB).
|
|
*/
|
|
if (addr + size > MAP_32BIT_MAX_ADDR)
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addr = 0;
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#endif
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} else {
|
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/*
|
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* XXX for non-fixed mappings where no hint is provided or
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* the hint would fall in the potential heap space,
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* place it after the end of the largest possible heap.
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*
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* There should really be a pmap call to determine a reasonable
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* location.
|
|
*/
|
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PROC_LOCK(td->td_proc);
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if (addr == 0 ||
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(addr >= round_page((vm_offset_t)vms->vm_taddr) &&
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addr < round_page((vm_offset_t)vms->vm_daddr +
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lim_max(td->td_proc, RLIMIT_DATA))))
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addr = round_page((vm_offset_t)vms->vm_daddr +
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lim_max(td->td_proc, RLIMIT_DATA));
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PROC_UNLOCK(td->td_proc);
|
|
}
|
|
if (flags & MAP_ANON) {
|
|
/*
|
|
* Mapping blank space is trivial.
|
|
*/
|
|
handle = NULL;
|
|
handle_type = OBJT_DEFAULT;
|
|
maxprot = VM_PROT_ALL;
|
|
cap_maxprot = VM_PROT_ALL;
|
|
} else {
|
|
/*
|
|
* Mapping file, get fp for validation and don't let the
|
|
* descriptor disappear on us if we block. Check capability
|
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* rights, but also return the maximum rights to be combined
|
|
* with maxprot later.
|
|
*/
|
|
cap_rights_init(&rights, CAP_MMAP);
|
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if (prot & PROT_READ)
|
|
cap_rights_set(&rights, CAP_MMAP_R);
|
|
if ((flags & MAP_SHARED) != 0) {
|
|
if (prot & PROT_WRITE)
|
|
cap_rights_set(&rights, CAP_MMAP_W);
|
|
}
|
|
if (prot & PROT_EXEC)
|
|
cap_rights_set(&rights, CAP_MMAP_X);
|
|
error = fget_mmap(td, uap->fd, &rights, &cap_maxprot, &fp);
|
|
if (error != 0)
|
|
goto done;
|
|
if (fp->f_type == DTYPE_SHM) {
|
|
handle = fp->f_data;
|
|
handle_type = OBJT_SWAP;
|
|
maxprot = VM_PROT_NONE;
|
|
|
|
/* FREAD should always be set. */
|
|
if (fp->f_flag & FREAD)
|
|
maxprot |= VM_PROT_EXECUTE | VM_PROT_READ;
|
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if (fp->f_flag & FWRITE)
|
|
maxprot |= VM_PROT_WRITE;
|
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goto map;
|
|
}
|
|
if (fp->f_type != DTYPE_VNODE) {
|
|
error = ENODEV;
|
|
goto done;
|
|
}
|
|
#if defined(COMPAT_FREEBSD7) || defined(COMPAT_FREEBSD6) || \
|
|
defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4)
|
|
/*
|
|
* 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)
|
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flags |= MAP_NOSYNC;
|
|
#endif
|
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vp = fp->f_vnode;
|
|
/*
|
|
* 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?
|
|
*/
|
|
if (vp->v_mount != NULL && vp->v_mount->mnt_flag & MNT_NOEXEC)
|
|
maxprot = VM_PROT_NONE;
|
|
else
|
|
maxprot = VM_PROT_EXECUTE;
|
|
if (fp->f_flag & FREAD) {
|
|
maxprot |= VM_PROT_READ;
|
|
} else if (prot & PROT_READ) {
|
|
error = EACCES;
|
|
goto done;
|
|
}
|
|
/*
|
|
* 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.
|
|
*/
|
|
if ((flags & MAP_SHARED) != 0) {
|
|
if ((fp->f_flag & FWRITE) != 0) {
|
|
maxprot |= VM_PROT_WRITE;
|
|
} else if ((prot & PROT_WRITE) != 0) {
|
|
error = EACCES;
|
|
goto done;
|
|
}
|
|
} else if (vp->v_type != VCHR || (fp->f_flag & FWRITE) != 0) {
|
|
maxprot |= VM_PROT_WRITE;
|
|
cap_maxprot |= VM_PROT_WRITE;
|
|
}
|
|
handle = (void *)vp;
|
|
handle_type = OBJT_VNODE;
|
|
}
|
|
map:
|
|
td->td_fpop = fp;
|
|
maxprot &= cap_maxprot;
|
|
error = vm_mmap(&vms->vm_map, &addr, size, prot, maxprot,
|
|
flags, handle_type, handle, pos);
|
|
td->td_fpop = NULL;
|
|
#ifdef HWPMC_HOOKS
|
|
/* inform hwpmc(4) if an executable is being mapped */
|
|
if (error == 0 && handle_type == OBJT_VNODE &&
|
|
(prot & PROT_EXEC)) {
|
|
pkm.pm_file = handle;
|
|
pkm.pm_address = (uintptr_t) addr;
|
|
PMC_CALL_HOOK(td, PMC_FN_MMAP, (void *) &pkm);
|
|
}
|
|
#endif
|
|
if (error == 0)
|
|
td->td_retval[0] = (register_t) (addr + pageoff);
|
|
done:
|
|
if (fp)
|
|
fdrop(fp, td);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
freebsd6_mmap(struct thread *td, struct freebsd6_mmap_args *uap)
|
|
{
|
|
struct mmap_args oargs;
|
|
|
|
oargs.addr = uap->addr;
|
|
oargs.len = uap->len;
|
|
oargs.prot = uap->prot;
|
|
oargs.flags = uap->flags;
|
|
oargs.fd = uap->fd;
|
|
oargs.pos = uap->pos;
|
|
return (sys_mmap(td, &oargs));
|
|
}
|
|
|
|
#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(td, uap)
|
|
struct thread *td;
|
|
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
|
|
|
|
nargs.addr = uap->addr;
|
|
nargs.len = uap->len;
|
|
nargs.prot = cvtbsdprot[uap->prot & 0x7];
|
|
#ifdef COMPAT_FREEBSD32
|
|
#if defined(__amd64__) || defined(__ia64__)
|
|
if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32) &&
|
|
nargs.prot != 0)
|
|
nargs.prot |= PROT_EXEC;
|
|
#endif
|
|
#endif
|
|
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;
|
|
nargs.fd = uap->fd;
|
|
nargs.pos = uap->pos;
|
|
return (sys_mmap(td, &nargs));
|
|
}
|
|
#endif /* COMPAT_43 */
|
|
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct msync_args {
|
|
void *addr;
|
|
size_t len;
|
|
int flags;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
sys_msync(td, uap)
|
|
struct thread *td;
|
|
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 = &td->td_proc->p_vmspace->vm_map;
|
|
|
|
/*
|
|
* Clean the pages and interpret the return value.
|
|
*/
|
|
rv = vm_map_sync(map, addr, addr + size, (flags & MS_ASYNC) == 0,
|
|
(flags & MS_INVALIDATE) != 0);
|
|
switch (rv) {
|
|
case KERN_SUCCESS:
|
|
return (0);
|
|
case KERN_INVALID_ADDRESS:
|
|
return (EINVAL); /* Sun returns ENOMEM? */
|
|
case KERN_INVALID_ARGUMENT:
|
|
return (EBUSY);
|
|
case KERN_FAILURE:
|
|
return (EIO);
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct munmap_args {
|
|
void *addr;
|
|
size_t len;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
sys_munmap(td, uap)
|
|
struct thread *td;
|
|
struct munmap_args *uap;
|
|
{
|
|
#ifdef HWPMC_HOOKS
|
|
struct pmckern_map_out pkm;
|
|
vm_map_entry_t entry;
|
|
#endif
|
|
vm_offset_t addr;
|
|
vm_size_t size, pageoff;
|
|
vm_map_t map;
|
|
|
|
addr = (vm_offset_t) uap->addr;
|
|
size = uap->len;
|
|
if (size == 0)
|
|
return (EINVAL);
|
|
|
|
pageoff = (addr & PAGE_MASK);
|
|
addr -= pageoff;
|
|
size += pageoff;
|
|
size = (vm_size_t) round_page(size);
|
|
if (addr + size < addr)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* Check for illegal addresses. Watch out for address wrap...
|
|
*/
|
|
map = &td->td_proc->p_vmspace->vm_map;
|
|
if (addr < vm_map_min(map) || addr + size > vm_map_max(map))
|
|
return (EINVAL);
|
|
vm_map_lock(map);
|
|
#ifdef HWPMC_HOOKS
|
|
/*
|
|
* Inform hwpmc if the address range being unmapped contains
|
|
* an executable region.
|
|
*/
|
|
pkm.pm_address = (uintptr_t) NULL;
|
|
if (vm_map_lookup_entry(map, addr, &entry)) {
|
|
for (;
|
|
entry != &map->header && entry->start < addr + size;
|
|
entry = entry->next) {
|
|
if (vm_map_check_protection(map, entry->start,
|
|
entry->end, VM_PROT_EXECUTE) == TRUE) {
|
|
pkm.pm_address = (uintptr_t) addr;
|
|
pkm.pm_size = (size_t) size;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
vm_map_delete(map, addr, addr + size);
|
|
|
|
#ifdef HWPMC_HOOKS
|
|
/* downgrade the lock to prevent a LOR with the pmc-sx lock */
|
|
vm_map_lock_downgrade(map);
|
|
if (pkm.pm_address != (uintptr_t) NULL)
|
|
PMC_CALL_HOOK(td, PMC_FN_MUNMAP, (void *) &pkm);
|
|
vm_map_unlock_read(map);
|
|
#else
|
|
vm_map_unlock(map);
|
|
#endif
|
|
/* vm_map_delete returns nothing but KERN_SUCCESS anyway */
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct mprotect_args {
|
|
const void *addr;
|
|
size_t len;
|
|
int prot;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
sys_mprotect(td, uap)
|
|
struct thread *td;
|
|
struct mprotect_args *uap;
|
|
{
|
|
vm_offset_t addr;
|
|
vm_size_t size, pageoff;
|
|
vm_prot_t prot;
|
|
|
|
addr = (vm_offset_t) uap->addr;
|
|
size = uap->len;
|
|
prot = uap->prot & VM_PROT_ALL;
|
|
|
|
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(&td->td_proc->p_vmspace->vm_map, addr,
|
|
addr + size, prot, FALSE)) {
|
|
case KERN_SUCCESS:
|
|
return (0);
|
|
case KERN_PROTECTION_FAILURE:
|
|
return (EACCES);
|
|
case KERN_RESOURCE_SHORTAGE:
|
|
return (ENOMEM);
|
|
}
|
|
return (EINVAL);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct minherit_args {
|
|
void *addr;
|
|
size_t len;
|
|
int inherit;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
sys_minherit(td, uap)
|
|
struct thread *td;
|
|
struct minherit_args *uap;
|
|
{
|
|
vm_offset_t addr;
|
|
vm_size_t size, pageoff;
|
|
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(&td->td_proc->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
|
|
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
sys_madvise(td, uap)
|
|
struct thread *td;
|
|
struct madvise_args *uap;
|
|
{
|
|
vm_offset_t start, end;
|
|
vm_map_t map;
|
|
int flags;
|
|
|
|
/*
|
|
* Check for our special case, advising the swap pager we are
|
|
* "immortal."
|
|
*/
|
|
if (uap->behav == MADV_PROTECT) {
|
|
flags = PPROT_SET;
|
|
return (kern_procctl(td, P_PID, td->td_proc->p_pid,
|
|
PROC_SPROTECT, &flags));
|
|
}
|
|
|
|
/*
|
|
* 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).
|
|
*/
|
|
map = &td->td_proc->p_vmspace->vm_map;
|
|
if ((vm_offset_t)uap->addr < vm_map_min(map) ||
|
|
(vm_offset_t)uap->addr + uap->len > vm_map_max(map))
|
|
return (EINVAL);
|
|
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(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
|
|
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
sys_mincore(td, uap)
|
|
struct thread *td;
|
|
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 = 0;
|
|
int vecindex, lastvecindex;
|
|
vm_map_entry_t current;
|
|
vm_map_entry_t entry;
|
|
vm_object_t object;
|
|
vm_paddr_t locked_pa;
|
|
vm_page_t m;
|
|
vm_pindex_t pindex;
|
|
int mincoreinfo;
|
|
unsigned int timestamp;
|
|
boolean_t locked;
|
|
|
|
/*
|
|
* 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);
|
|
map = &td->td_proc->p_vmspace->vm_map;
|
|
if (end > vm_map_max(map) || end < addr)
|
|
return (ENOMEM);
|
|
|
|
/*
|
|
* Address of byte vector
|
|
*/
|
|
vec = uap->vec;
|
|
|
|
pmap = vmspace_pmap(td->td_proc->p_vmspace);
|
|
|
|
vm_map_lock_read(map);
|
|
RestartScan:
|
|
timestamp = map->timestamp;
|
|
|
|
if (!vm_map_lookup_entry(map, addr, &entry)) {
|
|
vm_map_unlock_read(map);
|
|
return (ENOMEM);
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
|
|
/*
|
|
* check for contiguity
|
|
*/
|
|
if (current->end < end &&
|
|
(entry->next == &map->header ||
|
|
current->next->start > current->end)) {
|
|
vm_map_unlock_read(map);
|
|
return (ENOMEM);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
object = NULL;
|
|
locked_pa = 0;
|
|
retry:
|
|
m = NULL;
|
|
mincoreinfo = pmap_mincore(pmap, addr, &locked_pa);
|
|
if (locked_pa != 0) {
|
|
/*
|
|
* The page is mapped by this process but not
|
|
* both accessed and modified. It is also
|
|
* managed. Acquire the object lock so that
|
|
* other mappings might be examined.
|
|
*/
|
|
m = PHYS_TO_VM_PAGE(locked_pa);
|
|
if (m->object != object) {
|
|
if (object != NULL)
|
|
VM_OBJECT_WUNLOCK(object);
|
|
object = m->object;
|
|
locked = VM_OBJECT_TRYWLOCK(object);
|
|
vm_page_unlock(m);
|
|
if (!locked) {
|
|
VM_OBJECT_WLOCK(object);
|
|
vm_page_lock(m);
|
|
goto retry;
|
|
}
|
|
} else
|
|
vm_page_unlock(m);
|
|
KASSERT(m->valid == VM_PAGE_BITS_ALL,
|
|
("mincore: page %p is mapped but invalid",
|
|
m));
|
|
} else if (mincoreinfo == 0) {
|
|
/*
|
|
* The page is not mapped by this process. If
|
|
* the object implements managed pages, then
|
|
* determine if the page is resident so that
|
|
* the mappings might be examined.
|
|
*/
|
|
if (current->object.vm_object != object) {
|
|
if (object != NULL)
|
|
VM_OBJECT_WUNLOCK(object);
|
|
object = current->object.vm_object;
|
|
VM_OBJECT_WLOCK(object);
|
|
}
|
|
if (object->type == OBJT_DEFAULT ||
|
|
object->type == OBJT_SWAP ||
|
|
object->type == OBJT_VNODE) {
|
|
pindex = OFF_TO_IDX(current->offset +
|
|
(addr - current->start));
|
|
m = vm_page_lookup(object, pindex);
|
|
if (m == NULL &&
|
|
vm_page_is_cached(object, pindex))
|
|
mincoreinfo = MINCORE_INCORE;
|
|
if (m != NULL && m->valid == 0)
|
|
m = NULL;
|
|
if (m != NULL)
|
|
mincoreinfo = MINCORE_INCORE;
|
|
}
|
|
}
|
|
if (m != NULL) {
|
|
/* Examine other mappings to the page. */
|
|
if (m->dirty == 0 && pmap_is_modified(m))
|
|
vm_page_dirty(m);
|
|
if (m->dirty != 0)
|
|
mincoreinfo |= MINCORE_MODIFIED_OTHER;
|
|
/*
|
|
* The first test for PGA_REFERENCED is an
|
|
* optimization. The second test is
|
|
* required because a concurrent pmap
|
|
* operation could clear the last reference
|
|
* and set PGA_REFERENCED before the call to
|
|
* pmap_is_referenced().
|
|
*/
|
|
if ((m->aflags & PGA_REFERENCED) != 0 ||
|
|
pmap_is_referenced(m) ||
|
|
(m->aflags & PGA_REFERENCED) != 0)
|
|
mincoreinfo |= MINCORE_REFERENCED_OTHER;
|
|
}
|
|
if (object != NULL)
|
|
VM_OBJECT_WUNLOCK(object);
|
|
|
|
/*
|
|
* 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) {
|
|
++lastvecindex;
|
|
error = subyte(vec + lastvecindex, 0);
|
|
if (error) {
|
|
error = EFAULT;
|
|
goto done2;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Pass the page information to the user
|
|
*/
|
|
error = subyte(vec + vecindex, mincoreinfo);
|
|
if (error) {
|
|
error = EFAULT;
|
|
goto done2;
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
++lastvecindex;
|
|
error = subyte(vec + lastvecindex, 0);
|
|
if (error) {
|
|
error = EFAULT;
|
|
goto done2;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
done2:
|
|
return (error);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct mlock_args {
|
|
const void *addr;
|
|
size_t len;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
sys_mlock(td, uap)
|
|
struct thread *td;
|
|
struct mlock_args *uap;
|
|
{
|
|
|
|
return (vm_mlock(td->td_proc, td->td_ucred, uap->addr, uap->len));
|
|
}
|
|
|
|
int
|
|
vm_mlock(struct proc *proc, struct ucred *cred, const void *addr0, size_t len)
|
|
{
|
|
vm_offset_t addr, end, last, start;
|
|
vm_size_t npages, size;
|
|
vm_map_t map;
|
|
unsigned long nsize;
|
|
int error;
|
|
|
|
error = priv_check_cred(cred, PRIV_VM_MLOCK, 0);
|
|
if (error)
|
|
return (error);
|
|
addr = (vm_offset_t)addr0;
|
|
size = len;
|
|
last = addr + size;
|
|
start = trunc_page(addr);
|
|
end = round_page(last);
|
|
if (last < addr || end < addr)
|
|
return (EINVAL);
|
|
npages = atop(end - start);
|
|
if (npages > vm_page_max_wired)
|
|
return (ENOMEM);
|
|
map = &proc->p_vmspace->vm_map;
|
|
PROC_LOCK(proc);
|
|
nsize = ptoa(npages + pmap_wired_count(map->pmap));
|
|
if (nsize > lim_cur(proc, RLIMIT_MEMLOCK)) {
|
|
PROC_UNLOCK(proc);
|
|
return (ENOMEM);
|
|
}
|
|
PROC_UNLOCK(proc);
|
|
if (npages + cnt.v_wire_count > vm_page_max_wired)
|
|
return (EAGAIN);
|
|
#ifdef RACCT
|
|
PROC_LOCK(proc);
|
|
error = racct_set(proc, RACCT_MEMLOCK, nsize);
|
|
PROC_UNLOCK(proc);
|
|
if (error != 0)
|
|
return (ENOMEM);
|
|
#endif
|
|
error = vm_map_wire(map, start, end,
|
|
VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
|
|
#ifdef RACCT
|
|
if (error != KERN_SUCCESS) {
|
|
PROC_LOCK(proc);
|
|
racct_set(proc, RACCT_MEMLOCK,
|
|
ptoa(pmap_wired_count(map->pmap)));
|
|
PROC_UNLOCK(proc);
|
|
}
|
|
#endif
|
|
return (error == KERN_SUCCESS ? 0 : ENOMEM);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct mlockall_args {
|
|
int how;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
sys_mlockall(td, uap)
|
|
struct thread *td;
|
|
struct mlockall_args *uap;
|
|
{
|
|
vm_map_t map;
|
|
int error;
|
|
|
|
map = &td->td_proc->p_vmspace->vm_map;
|
|
error = priv_check(td, PRIV_VM_MLOCK);
|
|
if (error)
|
|
return (error);
|
|
|
|
if ((uap->how == 0) || ((uap->how & ~(MCL_CURRENT|MCL_FUTURE)) != 0))
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* If wiring all pages in the process would cause it to exceed
|
|
* a hard resource limit, return ENOMEM.
|
|
*/
|
|
if (!old_mlock && uap->how & MCL_CURRENT) {
|
|
PROC_LOCK(td->td_proc);
|
|
if (map->size > lim_cur(td->td_proc, RLIMIT_MEMLOCK)) {
|
|
PROC_UNLOCK(td->td_proc);
|
|
return (ENOMEM);
|
|
}
|
|
PROC_UNLOCK(td->td_proc);
|
|
}
|
|
#ifdef RACCT
|
|
PROC_LOCK(td->td_proc);
|
|
error = racct_set(td->td_proc, RACCT_MEMLOCK, map->size);
|
|
PROC_UNLOCK(td->td_proc);
|
|
if (error != 0)
|
|
return (ENOMEM);
|
|
#endif
|
|
|
|
if (uap->how & MCL_FUTURE) {
|
|
vm_map_lock(map);
|
|
vm_map_modflags(map, MAP_WIREFUTURE, 0);
|
|
vm_map_unlock(map);
|
|
error = 0;
|
|
}
|
|
|
|
if (uap->how & MCL_CURRENT) {
|
|
/*
|
|
* P1003.1-2001 mandates that all currently mapped pages
|
|
* will be memory resident and locked (wired) upon return
|
|
* from mlockall(). vm_map_wire() will wire pages, by
|
|
* calling vm_fault_wire() for each page in the region.
|
|
*/
|
|
error = vm_map_wire(map, vm_map_min(map), vm_map_max(map),
|
|
VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK);
|
|
error = (error == KERN_SUCCESS ? 0 : EAGAIN);
|
|
}
|
|
#ifdef RACCT
|
|
if (error != KERN_SUCCESS) {
|
|
PROC_LOCK(td->td_proc);
|
|
racct_set(td->td_proc, RACCT_MEMLOCK,
|
|
ptoa(pmap_wired_count(map->pmap)));
|
|
PROC_UNLOCK(td->td_proc);
|
|
}
|
|
#endif
|
|
|
|
return (error);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct munlockall_args {
|
|
register_t dummy;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
sys_munlockall(td, uap)
|
|
struct thread *td;
|
|
struct munlockall_args *uap;
|
|
{
|
|
vm_map_t map;
|
|
int error;
|
|
|
|
map = &td->td_proc->p_vmspace->vm_map;
|
|
error = priv_check(td, PRIV_VM_MUNLOCK);
|
|
if (error)
|
|
return (error);
|
|
|
|
/* Clear the MAP_WIREFUTURE flag from this vm_map. */
|
|
vm_map_lock(map);
|
|
vm_map_modflags(map, 0, MAP_WIREFUTURE);
|
|
vm_map_unlock(map);
|
|
|
|
/* Forcibly unwire all pages. */
|
|
error = vm_map_unwire(map, vm_map_min(map), vm_map_max(map),
|
|
VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK);
|
|
#ifdef RACCT
|
|
if (error == KERN_SUCCESS) {
|
|
PROC_LOCK(td->td_proc);
|
|
racct_set(td->td_proc, RACCT_MEMLOCK, 0);
|
|
PROC_UNLOCK(td->td_proc);
|
|
}
|
|
#endif
|
|
|
|
return (error);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct munlock_args {
|
|
const void *addr;
|
|
size_t len;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
sys_munlock(td, uap)
|
|
struct thread *td;
|
|
struct munlock_args *uap;
|
|
{
|
|
vm_offset_t addr, end, last, start;
|
|
vm_size_t size;
|
|
#ifdef RACCT
|
|
vm_map_t map;
|
|
#endif
|
|
int error;
|
|
|
|
error = priv_check(td, PRIV_VM_MUNLOCK);
|
|
if (error)
|
|
return (error);
|
|
addr = (vm_offset_t)uap->addr;
|
|
size = uap->len;
|
|
last = addr + size;
|
|
start = trunc_page(addr);
|
|
end = round_page(last);
|
|
if (last < addr || end < addr)
|
|
return (EINVAL);
|
|
error = vm_map_unwire(&td->td_proc->p_vmspace->vm_map, start, end,
|
|
VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
|
|
#ifdef RACCT
|
|
if (error == KERN_SUCCESS) {
|
|
PROC_LOCK(td->td_proc);
|
|
map = &td->td_proc->p_vmspace->vm_map;
|
|
racct_set(td->td_proc, RACCT_MEMLOCK,
|
|
ptoa(pmap_wired_count(map->pmap)));
|
|
PROC_UNLOCK(td->td_proc);
|
|
}
|
|
#endif
|
|
return (error == KERN_SUCCESS ? 0 : ENOMEM);
|
|
}
|
|
|
|
/*
|
|
* vm_mmap_vnode()
|
|
*
|
|
* Helper function for vm_mmap. Perform sanity check specific for mmap
|
|
* operations on vnodes.
|
|
*
|
|
* For VCHR vnodes, the vnode lock is held over the call to
|
|
* vm_mmap_cdev() to keep vp->v_rdev valid.
|
|
*/
|
|
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)
|
|
{
|
|
struct vattr va;
|
|
vm_object_t obj;
|
|
vm_offset_t foff;
|
|
struct mount *mp;
|
|
struct ucred *cred;
|
|
int error, flags, locktype;
|
|
|
|
mp = vp->v_mount;
|
|
cred = td->td_ucred;
|
|
if ((*maxprotp & VM_PROT_WRITE) && (*flagsp & MAP_SHARED))
|
|
locktype = LK_EXCLUSIVE;
|
|
else
|
|
locktype = LK_SHARED;
|
|
if ((error = vget(vp, locktype, td)) != 0)
|
|
return (error);
|
|
foff = *foffp;
|
|
flags = *flagsp;
|
|
obj = vp->v_object;
|
|
if (vp->v_type == VREG) {
|
|
/*
|
|
* Get the proper underlying object
|
|
*/
|
|
if (obj == NULL) {
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
if (obj->type == OBJT_VNODE && obj->handle != vp) {
|
|
vput(vp);
|
|
vp = (struct vnode *)obj->handle;
|
|
/*
|
|
* Bypass filesystems obey the mpsafety of the
|
|
* underlying fs. Tmpfs never bypasses.
|
|
*/
|
|
error = vget(vp, locktype, td);
|
|
if (error != 0)
|
|
return (error);
|
|
}
|
|
if (locktype == LK_EXCLUSIVE) {
|
|
*writecounted = TRUE;
|
|
vnode_pager_update_writecount(obj, 0, objsize);
|
|
}
|
|
} else if (vp->v_type == VCHR) {
|
|
error = vm_mmap_cdev(td, objsize, prot, maxprotp, flagsp,
|
|
vp->v_rdev, foffp, objp);
|
|
if (error == 0)
|
|
goto mark_atime;
|
|
goto done;
|
|
} else {
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
if ((error = VOP_GETATTR(vp, &va, cred)))
|
|
goto done;
|
|
#ifdef MAC
|
|
error = mac_vnode_check_mmap(cred, vp, prot, flags);
|
|
if (error != 0)
|
|
goto done;
|
|
#endif
|
|
if ((flags & MAP_SHARED) != 0) {
|
|
if ((va.va_flags & (SF_SNAPSHOT|IMMUTABLE|APPEND)) != 0) {
|
|
if (prot & PROT_WRITE) {
|
|
error = EPERM;
|
|
goto done;
|
|
}
|
|
*maxprotp &= ~VM_PROT_WRITE;
|
|
}
|
|
}
|
|
/*
|
|
* If it is a regular file without any references
|
|
* we do not need to sync it.
|
|
* Adjust object size to be the size of actual file.
|
|
*/
|
|
objsize = round_page(va.va_size);
|
|
if (va.va_nlink == 0)
|
|
flags |= MAP_NOSYNC;
|
|
if (obj->type == OBJT_VNODE)
|
|
obj = vm_pager_allocate(OBJT_VNODE, vp, objsize, prot, foff,
|
|
cred);
|
|
else {
|
|
KASSERT(obj->type == OBJT_DEFAULT || obj->type == OBJT_SWAP,
|
|
("wrong object type"));
|
|
vm_object_reference(obj);
|
|
}
|
|
if (obj == NULL) {
|
|
error = ENOMEM;
|
|
goto done;
|
|
}
|
|
*objp = obj;
|
|
*flagsp = flags;
|
|
|
|
mark_atime:
|
|
vfs_mark_atime(vp, cred);
|
|
|
|
done:
|
|
if (error != 0 && *writecounted) {
|
|
*writecounted = FALSE;
|
|
vnode_pager_update_writecount(obj, objsize, 0);
|
|
}
|
|
vput(vp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* vm_mmap_cdev()
|
|
*
|
|
* MPSAFE
|
|
*
|
|
* Helper function for vm_mmap. Perform sanity check specific for mmap
|
|
* operations on cdevs.
|
|
*/
|
|
int
|
|
vm_mmap_cdev(struct thread *td, vm_size_t objsize,
|
|
vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp,
|
|
struct cdev *cdev, vm_ooffset_t *foff, vm_object_t *objp)
|
|
{
|
|
vm_object_t obj;
|
|
struct cdevsw *dsw;
|
|
int error, flags, ref;
|
|
|
|
flags = *flagsp;
|
|
|
|
dsw = dev_refthread(cdev, &ref);
|
|
if (dsw == NULL)
|
|
return (ENXIO);
|
|
if (dsw->d_flags & D_MMAP_ANON) {
|
|
dev_relthread(cdev, ref);
|
|
*maxprotp = VM_PROT_ALL;
|
|
*flagsp |= MAP_ANON;
|
|
return (0);
|
|
}
|
|
/*
|
|
* cdevs do not provide private mappings of any kind.
|
|
*/
|
|
if ((*maxprotp & VM_PROT_WRITE) == 0 &&
|
|
(prot & PROT_WRITE) != 0) {
|
|
dev_relthread(cdev, ref);
|
|
return (EACCES);
|
|
}
|
|
if (flags & (MAP_PRIVATE|MAP_COPY)) {
|
|
dev_relthread(cdev, ref);
|
|
return (EINVAL);
|
|
}
|
|
/*
|
|
* Force device mappings to be shared.
|
|
*/
|
|
flags |= MAP_SHARED;
|
|
#ifdef MAC_XXX
|
|
error = mac_cdev_check_mmap(td->td_ucred, cdev, prot);
|
|
if (error != 0) {
|
|
dev_relthread(cdev, ref);
|
|
return (error);
|
|
}
|
|
#endif
|
|
/*
|
|
* First, try d_mmap_single(). If that is not implemented
|
|
* (returns ENODEV), fall back to using the device pager.
|
|
* Note that d_mmap_single() must return a reference to the
|
|
* object (it needs to bump the reference count of the object
|
|
* it returns somehow).
|
|
*
|
|
* XXX assumes VM_PROT_* == PROT_*
|
|
*/
|
|
error = dsw->d_mmap_single(cdev, foff, objsize, objp, (int)prot);
|
|
dev_relthread(cdev, ref);
|
|
if (error != ENODEV)
|
|
return (error);
|
|
obj = vm_pager_allocate(OBJT_DEVICE, cdev, objsize, prot, *foff,
|
|
td->td_ucred);
|
|
if (obj == NULL)
|
|
return (EINVAL);
|
|
*objp = obj;
|
|
*flagsp = flags;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* vm_mmap_shm()
|
|
*
|
|
* MPSAFE
|
|
*
|
|
* Helper function for vm_mmap. Perform sanity check specific for mmap
|
|
* operations on shm file descriptors.
|
|
*/
|
|
int
|
|
vm_mmap_shm(struct thread *td, vm_size_t objsize,
|
|
vm_prot_t prot, vm_prot_t *maxprotp, int *flagsp,
|
|
struct shmfd *shmfd, vm_ooffset_t foff, vm_object_t *objp)
|
|
{
|
|
int error;
|
|
|
|
if ((*flagsp & MAP_SHARED) != 0 &&
|
|
(*maxprotp & VM_PROT_WRITE) == 0 &&
|
|
(prot & PROT_WRITE) != 0)
|
|
return (EACCES);
|
|
#ifdef MAC
|
|
error = mac_posixshm_check_mmap(td->td_ucred, shmfd, prot, *flagsp);
|
|
if (error != 0)
|
|
return (error);
|
|
#endif
|
|
error = shm_mmap(shmfd, objsize, foff, objp);
|
|
if (error)
|
|
return (error);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* vm_mmap()
|
|
*
|
|
* MPSAFE
|
|
*
|
|
* 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,
|
|
objtype_t handle_type, void *handle,
|
|
vm_ooffset_t foff)
|
|
{
|
|
boolean_t fitit;
|
|
vm_object_t object = NULL;
|
|
struct thread *td = curthread;
|
|
int docow, error, findspace, rv;
|
|
boolean_t writecounted;
|
|
|
|
if (size == 0)
|
|
return (0);
|
|
|
|
size = round_page(size);
|
|
|
|
if (map == &td->td_proc->p_vmspace->vm_map) {
|
|
PROC_LOCK(td->td_proc);
|
|
if (map->size + size > lim_cur(td->td_proc, RLIMIT_VMEM)) {
|
|
PROC_UNLOCK(td->td_proc);
|
|
return (ENOMEM);
|
|
}
|
|
if (racct_set(td->td_proc, RACCT_VMEM, map->size + size)) {
|
|
PROC_UNLOCK(td->td_proc);
|
|
return (ENOMEM);
|
|
}
|
|
if (!old_mlock && map->flags & MAP_WIREFUTURE) {
|
|
if (ptoa(pmap_wired_count(map->pmap)) + size >
|
|
lim_cur(td->td_proc, RLIMIT_MEMLOCK)) {
|
|
racct_set_force(td->td_proc, RACCT_VMEM,
|
|
map->size);
|
|
PROC_UNLOCK(td->td_proc);
|
|
return (ENOMEM);
|
|
}
|
|
error = racct_set(td->td_proc, RACCT_MEMLOCK,
|
|
ptoa(pmap_wired_count(map->pmap)) + size);
|
|
if (error != 0) {
|
|
racct_set_force(td->td_proc, RACCT_VMEM,
|
|
map->size);
|
|
PROC_UNLOCK(td->td_proc);
|
|
return (error);
|
|
}
|
|
}
|
|
PROC_UNLOCK(td->td_proc);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
writecounted = FALSE;
|
|
|
|
/*
|
|
* Lookup/allocate object.
|
|
*/
|
|
switch (handle_type) {
|
|
case OBJT_DEVICE:
|
|
error = vm_mmap_cdev(td, size, prot, &maxprot, &flags,
|
|
handle, &foff, &object);
|
|
break;
|
|
case OBJT_VNODE:
|
|
error = vm_mmap_vnode(td, size, prot, &maxprot, &flags,
|
|
handle, &foff, &object, &writecounted);
|
|
break;
|
|
case OBJT_SWAP:
|
|
error = vm_mmap_shm(td, size, prot, &maxprot, &flags,
|
|
handle, foff, &object);
|
|
break;
|
|
case OBJT_DEFAULT:
|
|
if (handle == NULL) {
|
|
error = 0;
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
if (error)
|
|
return (error);
|
|
if (flags & MAP_ANON) {
|
|
object = NULL;
|
|
docow = 0;
|
|
/*
|
|
* Unnamed anonymous regions always start at 0.
|
|
*/
|
|
if (handle == 0)
|
|
foff = 0;
|
|
} else if (flags & MAP_PREFAULT_READ)
|
|
docow = MAP_PREFAULT;
|
|
else
|
|
docow = MAP_PREFAULT_PARTIAL;
|
|
|
|
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;
|
|
/* Shared memory is also shared with children. */
|
|
if (flags & MAP_SHARED)
|
|
docow |= MAP_INHERIT_SHARE;
|
|
if (writecounted)
|
|
docow |= MAP_VN_WRITECOUNT;
|
|
|
|
if (flags & MAP_STACK)
|
|
rv = vm_map_stack(map, *addr, size, prot, maxprot,
|
|
docow | MAP_STACK_GROWS_DOWN);
|
|
else if (fitit) {
|
|
if ((flags & MAP_ALIGNMENT_MASK) == MAP_ALIGNED_SUPER)
|
|
findspace = VMFS_SUPER_SPACE;
|
|
else if ((flags & MAP_ALIGNMENT_MASK) != 0)
|
|
findspace = VMFS_ALIGNED_SPACE(flags >>
|
|
MAP_ALIGNMENT_SHIFT);
|
|
else
|
|
findspace = VMFS_OPTIMAL_SPACE;
|
|
rv = vm_map_find(map, object, foff, addr, size,
|
|
#ifdef MAP_32BIT
|
|
flags & MAP_32BIT ? MAP_32BIT_MAX_ADDR :
|
|
#endif
|
|
0, findspace, prot, maxprot, docow);
|
|
} else
|
|
rv = vm_map_fixed(map, object, foff, *addr, size,
|
|
prot, maxprot, docow);
|
|
|
|
if (rv == KERN_SUCCESS) {
|
|
/*
|
|
* If the process has requested that all future mappings
|
|
* be wired, then heed this.
|
|
*/
|
|
if (map->flags & MAP_WIREFUTURE) {
|
|
vm_map_wire(map, *addr, *addr + size,
|
|
VM_MAP_WIRE_USER | ((flags & MAP_STACK) ?
|
|
VM_MAP_WIRE_HOLESOK : VM_MAP_WIRE_NOHOLES));
|
|
}
|
|
} else {
|
|
/*
|
|
* If this mapping was accounted for in the vnode's
|
|
* writecount, then undo that now.
|
|
*/
|
|
if (writecounted)
|
|
vnode_pager_release_writecount(object, 0, size);
|
|
/*
|
|
* 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);
|
|
}
|
|
return (vm_mmap_to_errno(rv));
|
|
}
|
|
|
|
/*
|
|
* Translate a Mach VM return code to zero on success or the appropriate errno
|
|
* on failure.
|
|
*/
|
|
int
|
|
vm_mmap_to_errno(int rv)
|
|
{
|
|
|
|
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);
|
|
}
|
|
}
|