procfs_mem.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1993 Jan-Simon Pendry
5 * Copyright (c) 1993 Sean Eric Fagan
6 * Copyright (c) 1993
7 *	The Regents of the University of California.  All rights reserved.
8 *
9 * This code is derived from software contributed to Berkeley by
10 * Jan-Simon Pendry and Sean Eric Fagan.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 *	@(#)procfs_mem.c	8.5 (Berkeley) 6/15/94
37 *
38 * $FreeBSD: stable/11/sys/fs/procfs/procfs_mem.c 330897 2018-03-14 03:19:51Z eadler $
39 */
40
41#include <sys/param.h>
42#include <sys/lock.h>
43#include <sys/mutex.h>
44#include <sys/proc.h>
45#include <sys/ptrace.h>
46#include <sys/systm.h>
47#include <sys/uio.h>
48
49#include <fs/pseudofs/pseudofs.h>
50#include <fs/procfs/procfs.h>
51
52/*
53 * Copy data in and out of the target process.
54 * We do this by mapping the process's page into
55 * the kernel and then doing a uiomove direct
56 * from the kernel address space.
57 */
58int
59procfs_doprocmem(PFS_FILL_ARGS)
60{
61	int error;
62
63	if (uio->uio_resid == 0)
64		return (0);
65
66	PROC_LOCK(p);
67	error = p_candebug(td, p);
68	PROC_UNLOCK(p);
69	if (error == 0)
70		error = proc_rwmem(p, uio);
71
72	return (error);
73}
74