19ea743456
mprotect settings so that debuggers can write to the text segment of traced processes so that they can insert breakpoints. Turned off by default. Ok: chuq (for now)
325 lines
8.9 KiB
C
325 lines
8.9 KiB
C
/* $NetBSD: subr_copy.c,v 1.7 2016/05/25 17:43:58 christos Exp $ */
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/*-
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* Copyright (c) 1997, 1998, 1999, 2002, 2007, 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* 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, Lawrence Berkeley Laboratory.
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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 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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* @(#)kern_subr.c 8.4 (Berkeley) 2/14/95
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: subr_copy.c,v 1.7 2016/05/25 17:43:58 christos Exp $");
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#include <sys/param.h>
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#include <sys/fcntl.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <uvm/uvm_extern.h>
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void
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uio_setup_sysspace(struct uio *uio)
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{
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uio->uio_vmspace = vmspace_kernel();
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}
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int
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uiomove(void *buf, size_t n, struct uio *uio)
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{
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struct vmspace *vm = uio->uio_vmspace;
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struct iovec *iov;
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size_t cnt;
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int error = 0;
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char *cp = buf;
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ASSERT_SLEEPABLE();
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KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE);
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while (n > 0 && uio->uio_resid) {
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iov = uio->uio_iov;
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cnt = iov->iov_len;
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if (cnt == 0) {
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KASSERT(uio->uio_iovcnt > 0);
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uio->uio_iov++;
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uio->uio_iovcnt--;
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continue;
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}
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if (cnt > n)
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cnt = n;
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if (!VMSPACE_IS_KERNEL_P(vm)) {
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if (curcpu()->ci_schedstate.spc_flags &
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SPCF_SHOULDYIELD)
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preempt();
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}
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if (uio->uio_rw == UIO_READ) {
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error = copyout_vmspace(vm, cp, iov->iov_base,
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cnt);
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} else {
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error = copyin_vmspace(vm, iov->iov_base, cp,
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cnt);
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}
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if (error) {
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break;
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}
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iov->iov_base = (char *)iov->iov_base + cnt;
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iov->iov_len -= cnt;
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uio->uio_resid -= cnt;
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uio->uio_offset += cnt;
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cp += cnt;
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KDASSERT(cnt <= n);
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n -= cnt;
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}
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return (error);
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}
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/*
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* Wrapper for uiomove() that validates the arguments against a known-good
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* kernel buffer.
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*/
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int
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uiomove_frombuf(void *buf, size_t buflen, struct uio *uio)
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{
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size_t offset;
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if (uio->uio_offset < 0 || /* uio->uio_resid < 0 || */
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(offset = uio->uio_offset) != uio->uio_offset)
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return (EINVAL);
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if (offset >= buflen)
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return (0);
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return (uiomove((char *)buf + offset, buflen - offset, uio));
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}
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/*
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* Give next character to user as result of read.
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*/
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int
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ureadc(int c, struct uio *uio)
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{
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struct iovec *iov;
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if (uio->uio_resid <= 0)
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panic("ureadc: non-positive resid");
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again:
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if (uio->uio_iovcnt <= 0)
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panic("ureadc: non-positive iovcnt");
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iov = uio->uio_iov;
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if (iov->iov_len <= 0) {
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uio->uio_iovcnt--;
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uio->uio_iov++;
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goto again;
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}
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if (!VMSPACE_IS_KERNEL_P(uio->uio_vmspace)) {
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if (subyte(iov->iov_base, c) < 0)
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return (EFAULT);
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} else {
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*(char *)iov->iov_base = c;
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}
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iov->iov_base = (char *)iov->iov_base + 1;
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iov->iov_len--;
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uio->uio_resid--;
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uio->uio_offset++;
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return (0);
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}
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/*
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* Like copyin(), but operates on an arbitrary vmspace.
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*/
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int
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copyin_vmspace(struct vmspace *vm, const void *uaddr, void *kaddr, size_t len)
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{
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struct iovec iov;
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struct uio uio;
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int error;
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if (len == 0)
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return (0);
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if (VMSPACE_IS_KERNEL_P(vm)) {
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return kcopy(uaddr, kaddr, len);
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}
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if (__predict_true(vm == curproc->p_vmspace)) {
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return copyin(uaddr, kaddr, len);
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}
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iov.iov_base = kaddr;
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iov.iov_len = len;
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uio.uio_iov = &iov;
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uio.uio_iovcnt = 1;
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uio.uio_offset = (off_t)(uintptr_t)uaddr;
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uio.uio_resid = len;
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uio.uio_rw = UIO_READ;
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UIO_SETUP_SYSSPACE(&uio);
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error = uvm_io(&vm->vm_map, &uio, 0);
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return (error);
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}
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/*
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* Like copyout(), but operates on an arbitrary vmspace.
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*/
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int
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copyout_vmspace(struct vmspace *vm, const void *kaddr, void *uaddr, size_t len)
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{
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struct iovec iov;
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struct uio uio;
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int error;
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if (len == 0)
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return (0);
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if (VMSPACE_IS_KERNEL_P(vm)) {
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return kcopy(kaddr, uaddr, len);
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}
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if (__predict_true(vm == curproc->p_vmspace)) {
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return copyout(kaddr, uaddr, len);
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}
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iov.iov_base = __UNCONST(kaddr); /* XXXUNCONST cast away const */
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iov.iov_len = len;
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uio.uio_iov = &iov;
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uio.uio_iovcnt = 1;
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uio.uio_offset = (off_t)(uintptr_t)uaddr;
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uio.uio_resid = len;
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uio.uio_rw = UIO_WRITE;
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UIO_SETUP_SYSSPACE(&uio);
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error = uvm_io(&vm->vm_map, &uio, 0);
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return (error);
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}
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/*
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* Like copyin(), but operates on an arbitrary process.
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*/
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int
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copyin_proc(struct proc *p, const void *uaddr, void *kaddr, size_t len)
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{
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struct vmspace *vm;
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int error;
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error = proc_vmspace_getref(p, &vm);
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if (error) {
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return error;
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}
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error = copyin_vmspace(vm, uaddr, kaddr, len);
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uvmspace_free(vm);
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return error;
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}
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/*
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* Like copyout(), but operates on an arbitrary process.
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*/
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int
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copyout_proc(struct proc *p, const void *kaddr, void *uaddr, size_t len)
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{
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struct vmspace *vm;
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int error;
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error = proc_vmspace_getref(p, &vm);
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if (error) {
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return error;
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}
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error = copyout_vmspace(vm, kaddr, uaddr, len);
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uvmspace_free(vm);
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return error;
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}
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/*
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* Like copyin(), except it operates on kernel addresses when the FKIOCTL
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* flag is passed in `ioctlflags' from the ioctl call.
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*/
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int
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ioctl_copyin(int ioctlflags, const void *src, void *dst, size_t len)
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{
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if (ioctlflags & FKIOCTL)
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return kcopy(src, dst, len);
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return copyin(src, dst, len);
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}
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/*
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* Like copyout(), except it operates on kernel addresses when the FKIOCTL
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* flag is passed in `ioctlflags' from the ioctl call.
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*/
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int
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ioctl_copyout(int ioctlflags, const void *src, void *dst, size_t len)
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{
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if (ioctlflags & FKIOCTL)
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return kcopy(src, dst, len);
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return copyout(src, dst, len);
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}
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