90 lines
3.0 KiB
Groff
90 lines
3.0 KiB
Groff
.\" $NetBSD: access.9,v 1.1 1996/06/16 10:38:35 pk Exp $
|
|
.\"
|
|
.\" Copyright (c) 1996 The NetBSD Foundation, Inc.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to The NetBSD Foundation
|
|
.\" by Paul Kranenburg.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the NetBSD
|
|
.\" Foundation, Inc. and its contributors.
|
|
.\" 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
.\" contributors may be used to endorse or promote products derived
|
|
.\" from this software without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
|
|
.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
.\" POSSIBILITY OF SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd June 16, 1996
|
|
.Dt KERNACC 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm kernacc ,
|
|
.Nm useracc
|
|
.Nd check memory regions for accessibility
|
|
.Sh SYNOPSIS
|
|
.In sys/types.h
|
|
.In vm/vm.h
|
|
.In vm/vm_extern.h
|
|
.Ft int
|
|
.Fn kernacc "caddr_t addr" "int len" "int rw"
|
|
.Ft int
|
|
.Fn useracc "caddr_t addr" "int len" "int rw"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn kernacc
|
|
and
|
|
.Fn useracc
|
|
functions check whether operations of the type specified in
|
|
.Fa rw
|
|
are permitted in the range of virtual addresses given by
|
|
.Fa addr
|
|
and
|
|
.Fa len .
|
|
The possible values of
|
|
.Fa rw
|
|
are any bitwise combination of
|
|
.Dv VM_PROT_READ ,
|
|
.Dv VM_PROT_WRITE
|
|
and
|
|
.Dv VM_PROT_EXECUTE .
|
|
.Fn kernacc
|
|
checks addresses in the kernel address space, while
|
|
.Fn useracc
|
|
considers
|
|
.Fa addr
|
|
to represent an user space address.
|
|
The process context to use for this
|
|
operation is taken from the global variable
|
|
.Va curproc .
|
|
.Sh RETURN VALUES
|
|
Both functions return boolean true if the type of access specified
|
|
by
|
|
.Fa rw
|
|
is permitted.
|
|
Otherwise boolean false is returned.
|
|
.Sh BUGS
|
|
The process pointer should be passed in as an argument to
|
|
.Fn useracc .
|