$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.
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 n sys/param.h n sys/proc.h n vm/vm.h n vm/vm_extern.h .Ft int .Fn kernacc "void *addr" "int len" "int rw" .Ft int .Fn useracc "void *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 .
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.
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 n sys/param.h n sys/proc.h n vm/vm.h n vm/vm_extern.h .Ft int .Fn kernacc "void *addr" "int len" "int rw" .Ft int .Fn useracc "void *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 .