592 lines
17 KiB
C
592 lines
17 KiB
C
/*-
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* Copyright (c) 2001 Networks Associates Technologies, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by NAI Labs, the
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* Security Research Division of Network Associates, Inc. under
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* DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
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* CHATS research program.
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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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* 3. Neither the name of the the above entities nor the names of any
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* contributors of those entities may be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* $Id$
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*/
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/*
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.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/proc.h>
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#include <sys/vnode.h>
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#include <sys/file.h>
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#include <sys/fcntl.h>
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#include <sys/conf.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.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 "kernel_interface.h"
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#include "kernel_mediate.h"
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#include "kernel_monitor.h"
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#include "kernel_util.h"
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#include "lomacfs.h"
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extern int max_proc_mmap;
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int lomac_mmap(struct proc *, struct mmap_args *);
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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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* Block devices can be mmap'd no matter what they represent. Cache coherency
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* is maintained as long as you do not write directly to the underlying
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* 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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int
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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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struct proc *p = td->td_proc;
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struct filedesc *fdp = p->p_fd;
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struct file *fp = NULL;
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struct vnode *vp, *origvp;
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vm_offset_t addr;
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vm_size_t size, pageoff;
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vm_prot_t prot, maxprot;
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void *handle;
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int flags, error;
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int disablexworkaround;
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off_t pos;
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struct vmspace *vms = p->p_vmspace;
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vm_object_t obj;
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lomac_object_t lobj;
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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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origvp = NULL;
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/* make sure mapping fits into numeric range etc */
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if ((ssize_t) uap->len < 0 ||
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((flags & MAP_ANON) && uap->fd != -1))
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return (EINVAL);
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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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/*
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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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/*
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* The specified address must have the same remainder
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* 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 (VM_MAXUSER_ADDRESS > 0 && addr + size > VM_MAXUSER_ADDRESS)
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return (EINVAL);
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#ifndef i386
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if (VM_MIN_ADDRESS > 0 && addr < VM_MIN_ADDRESS)
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return (EINVAL);
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#endif
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if (addr + size < addr)
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return (EINVAL);
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}
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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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*/
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else 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 + MAXDSIZ)))
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addr = round_page((vm_offset_t)vms->vm_daddr + MAXDSIZ);
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mtx_lock(&Giant); /* syscall marked mp-safe but isn't */
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if (flags & MAP_ANON) {
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/*
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* Mapping blank space is trivial.
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*/
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handle = NULL;
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maxprot = VM_PROT_ALL;
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pos = 0;
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} else {
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/*
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* Mapping file, get fp for validation. Obtain vnode and make
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* sure it is of appropriate type.
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*/
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if (((unsigned) uap->fd) >= fdp->fd_nfiles ||
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(fp = fdp->fd_ofiles[uap->fd]) == NULL) {
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mtx_unlock(&Giant);
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return (EBADF);
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}
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if (fp->f_type != DTYPE_VNODE) {
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mtx_unlock(&Giant);
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return (EINVAL);
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}
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/*
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* don't let the descriptor disappear on us if we block
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*/
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fhold(fp);
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/*
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* POSIX shared-memory objects are defined to have
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* kernel persistence, and are not defined to support
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* read(2)/write(2) -- or even open(2). Thus, we can
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* use MAP_ASYNC to trade on-disk coherence for speed.
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* The shm_open(3) library routine turns on the FPOSIXSHM
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* flag to request this behavior.
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*/
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if (fp->f_flag & FPOSIXSHM)
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flags |= MAP_NOSYNC;
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vp = (struct vnode *) fp->f_data;
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if (vp->v_type != VREG && vp->v_type != VCHR) {
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error = EINVAL;
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goto done;
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}
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if (vp->v_type == VREG) {
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/*
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* Get the proper underlying object
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*/
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if (VOP_GETVOBJECT(vp, &obj) != 0) {
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error = EINVAL;
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goto done;
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}
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origvp = vp;
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vp = (struct vnode*)obj->handle;
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}
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/*
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* XXX hack to handle use of /dev/zero to map anon memory (ala
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* SunOS).
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*/
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if ((vp->v_type == VCHR) &&
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(vp->v_rdev->si_devsw->d_flags & D_MMAP_ANON)) {
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handle = NULL;
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maxprot = VM_PROT_ALL;
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flags |= MAP_ANON;
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pos = 0;
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} else {
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/*
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* cdevs does not provide private mappings of any kind.
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*/
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/*
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* However, for XIG X server to continue to work,
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* we should allow the superuser to do it anyway.
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* We only allow it at securelevel < 1.
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* (Because the XIG X server writes directly to video
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* memory via /dev/mem, it should never work at any
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* other securelevel.
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* XXX this will have to go
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*/
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if (securelevel >= 1)
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disablexworkaround = 1;
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else
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disablexworkaround = suser(p);
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if (vp->v_type == VCHR && disablexworkaround &&
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(flags & (MAP_PRIVATE|MAP_COPY))) {
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error = EINVAL;
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goto done;
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}
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/*
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* Ensure that file and memory protections are
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* compatible. Note that we only worry about
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* writability if mapping is shared; in this case,
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* current and max prot are dictated by the open file.
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* XXX use the vnode instead? Problem is: what
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* credentials do we use for determination? What if
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* proc does a setuid?
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*/
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maxprot = VM_PROT_EXECUTE; /* ??? */
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if (fp->f_flag & FREAD) {
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maxprot |= VM_PROT_READ;
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} else if (prot & PROT_READ) {
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error = EACCES;
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goto done;
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}
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/*
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* If we are sharing potential changes (either via
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* MAP_SHARED or via the implicit sharing of character
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* device mappings), and we are trying to get write
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* permission although we opened it without asking
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* for it, bail out. Check for superuser, only if
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* we're at securelevel < 1, to allow the XIG X server
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* to continue to work.
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*/
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if ((flags & MAP_SHARED) != 0 ||
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(vp->v_type == VCHR && disablexworkaround)) {
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if ((fp->f_flag & FWRITE) != 0) {
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struct vattr va;
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if ((error =
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VOP_GETATTR(vp, &va,
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p->p_ucred, td))) {
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goto done;
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}
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if ((va.va_flags &
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(SF_SNAPSHOT|IMMUTABLE|APPEND)) == 0) {
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maxprot |= VM_PROT_WRITE;
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} else if (prot & PROT_WRITE) {
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error = EPERM;
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goto done;
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}
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} else if ((prot & PROT_WRITE) != 0) {
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error = EACCES;
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goto done;
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}
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} else {
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maxprot |= VM_PROT_WRITE;
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}
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handle = (void *)vp;
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origvp = vp;
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}
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}
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/*
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* Do not allow more then a certain number of vm_map_entry structures
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* per process. Scale with the number of rforks sharing the map
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* to make the limit reasonable for threads.
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*/
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if (max_proc_mmap &&
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vms->vm_map.nentries >= max_proc_mmap * vms->vm_refcnt) {
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error = ENOMEM;
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goto done;
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}
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mtx_unlock(&Giant);
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error = 0;
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if (handle != NULL && VISLOMAC(origvp)) {
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lobj.lo_type = LO_TYPE_LVNODE;
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lobj.lo_object.vnode = origvp;
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if (flags & MAP_SHARED && maxprot & VM_PROT_WRITE &&
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!mediate_subject_object("mmap", p, &lobj))
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error = EPERM;
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if (error == 0 && maxprot & VM_PROT_READ)
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error = monitor_read_object(p, &lobj);
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}
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if (error == 0)
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error = vm_mmap(&vms->vm_map, &addr, size, prot, maxprot,
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flags, handle, pos);
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if (error == 0)
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td->td_retval[0] = (register_t) (addr + pageoff);
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mtx_lock(&Giant);
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done:
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if (fp)
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fdrop(fp, td);
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mtx_unlock(&Giant);
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return (error);
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}
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static void
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vm_drop_perms_recurse(struct thread *td, struct vm_map *map, lattr_t *lattr) {
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struct vm_map_entry *vme;
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for (vme = map->header.next; vme != &map->header; vme = vme->next) {
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if (vme->eflags & MAP_ENTRY_IS_SUB_MAP) {
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vm_map_lock_read(vme->object.sub_map);
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vm_drop_perms_recurse(td, vme->object.sub_map,
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lattr);
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vm_map_unlock_read(vme->object.sub_map);
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continue;
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}
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if ((vme->eflags & (MAP_ENTRY_COW | MAP_ENTRY_NOSYNC)) == 0 &&
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vme->max_protection & VM_PROT_WRITE) {
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vm_object_t object;
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vm_ooffset_t offset;
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lomac_object_t lobj;
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struct vnode *vp;
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lattr_t olattr;
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offset = vme->offset;
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object = vme->object.vm_object;
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if (object == NULL)
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continue;
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while (object->backing_object) {
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object = object->backing_object;
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offset += object->backing_object_offset;
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}
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/*
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* Regular objects (swap, etc.) inherit from
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* their creator. Vnodes inherit from their
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* underlying on-disk object.
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*/
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if (object->type == OBJT_DEVICE)
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continue;
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if (object->type == OBJT_VNODE) {
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vp = lobj.lo_object.vnode = object->handle;
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/*
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* For the foreseeable future, an OBJT_VNODE
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* is always !VISLOMAC().
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*/
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lobj.lo_type = VISLOMAC(vp) ?
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LO_TYPE_LVNODE : LO_TYPE_UVNODE;
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} else {
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vp = NULL;
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lobj.lo_object.vm_object = object;
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lobj.lo_type = LO_TYPE_VM_OBJECT;
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}
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get_object_lattr(&lobj, &olattr);
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/*
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* Revoke write access only to files with a higher
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* level than the process or which have a possibly-
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* undeterminable level (interpreted as "lowest").
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*/
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if (lomac_must_deny(lattr, &olattr))
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continue;
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vm_map_lock_upgrade(map);
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/*
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* If it's a private, non-file-backed mapping and
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* not mapped anywhere else, we can just take it
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* down with us.
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*/
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if (vp == NULL && object->flags & OBJ_ONEMAPPING) {
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olattr.level = lattr->level;
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set_object_lattr(&lobj, olattr);
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goto downgrade;
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}
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if ((vme->protection & VM_PROT_WRITE) == 0)
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vme->max_protection &= ~VM_PROT_WRITE;
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else {
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vm_object_reference(object);
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if (vp != NULL)
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY,
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td);
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vm_object_page_clean(object,
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OFF_TO_IDX(offset),
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OFF_TO_IDX(offset + vme->end - vme->start +
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PAGE_MASK),
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OBJPC_SYNC);
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if (vp != NULL)
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VOP_UNLOCK(vp, 0, td);
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vm_object_deallocate(object);
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vme->eflags |= MAP_ENTRY_COW |
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MAP_ENTRY_NEEDS_COPY;
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pmap_protect(map->pmap, vme->start, vme->end,
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vme->protection & ~VM_PROT_WRITE);
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vm_map_simplify_entry(map, vme);
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}
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downgrade:
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vm_map_lock_downgrade(map);
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}
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}
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}
|
|
|
|
void
|
|
kernel_vm_drop_perms(struct thread *td, lattr_t *newlattr) {
|
|
struct vm_map *map = &td->td_proc->p_vmspace->vm_map;
|
|
|
|
mtx_lock(&Giant);
|
|
vm_map_lock_read(map);
|
|
vm_drop_perms_recurse(td, map, newlattr);
|
|
vm_map_unlock_read(map);
|
|
mtx_unlock(&Giant);
|
|
}
|
|
|
|
/*
|
|
* Take the level of new vm_objects from the parent subject's level.
|
|
*/
|
|
static void
|
|
vm_object_init_lattr(vm_object_t object) {
|
|
lomac_object_t lobj;
|
|
lattr_t lattr;
|
|
|
|
get_subject_lattr(curthread->td_proc, &lattr);
|
|
lattr.flags = 0;
|
|
lobj.lo_type = LO_TYPE_VM_OBJECT;
|
|
lobj.lo_object.vm_object = object;
|
|
set_object_lattr(&lobj, lattr);
|
|
}
|
|
|
|
|
|
#define PGO_ALLOC_REPLACEMENT(n) \
|
|
static vm_object_t (*old_pgo_alloc_##n)(void *, vm_ooffset_t, \
|
|
vm_prot_t, vm_ooffset_t); \
|
|
\
|
|
static vm_object_t \
|
|
pgo_alloc_##n(void *handle, vm_ooffset_t size, vm_prot_t prot, \
|
|
vm_ooffset_t off) { \
|
|
vm_object_t newobj = NULL; \
|
|
\
|
|
newobj = old_pgo_alloc_##n(handle, size, prot, off); \
|
|
if (newobj != NULL) \
|
|
vm_object_init_lattr(newobj); \
|
|
return (newobj); \
|
|
}
|
|
|
|
#define PGO_ALLOC_REPLACE(n) \
|
|
do { \
|
|
old_pgo_alloc_##n = pagertab[n]->pgo_alloc; \
|
|
if (pagertab[n]->pgo_alloc != NULL) \
|
|
pagertab[n]->pgo_alloc = pgo_alloc_##n; \
|
|
} while (0)
|
|
|
|
#define PGO_ALLOC_UNREPLACE(n) \
|
|
do { \
|
|
pagertab[n]->pgo_alloc = old_pgo_alloc_##n; \
|
|
} while (0)
|
|
|
|
PGO_ALLOC_REPLACEMENT(0);
|
|
PGO_ALLOC_REPLACEMENT(1);
|
|
PGO_ALLOC_REPLACEMENT(2);
|
|
PGO_ALLOC_REPLACEMENT(3);
|
|
PGO_ALLOC_REPLACEMENT(4);
|
|
PGO_ALLOC_REPLACEMENT(5);
|
|
|
|
extern int npagers;
|
|
|
|
int
|
|
lomac_initialize_vm(void) {
|
|
GIANT_REQUIRED;
|
|
|
|
if (npagers != 6) {
|
|
printf("LOMAC: number of pagers %d not expected 6!\n", npagers);
|
|
return (EDOM);
|
|
}
|
|
PGO_ALLOC_REPLACE(0);
|
|
PGO_ALLOC_REPLACE(1);
|
|
PGO_ALLOC_REPLACE(2);
|
|
PGO_ALLOC_REPLACE(3);
|
|
PGO_ALLOC_REPLACE(4);
|
|
PGO_ALLOC_REPLACE(5);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
lomac_uninitialize_vm(void) {
|
|
GIANT_REQUIRED;
|
|
|
|
PGO_ALLOC_UNREPLACE(0);
|
|
PGO_ALLOC_UNREPLACE(1);
|
|
PGO_ALLOC_UNREPLACE(2);
|
|
PGO_ALLOC_UNREPLACE(3);
|
|
PGO_ALLOC_UNREPLACE(4);
|
|
PGO_ALLOC_UNREPLACE(5);
|
|
return (0);
|
|
}
|