1/* $NetBSD: sys_ptrace.c,v 1.2 2016/11/03 03:57:05 pgoyette Exp $ */
2
3/*-
4 * Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Andrew Doran.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*-
33 * Copyright (c) 1982, 1986, 1989, 1993
34 * The Regents of the University of California. All rights reserved.
35 * (c) UNIX System Laboratories, Inc.
36 * All or some portions of this file are derived from material licensed
37 * to the University of California by American Telephone and Telegraph
38 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
39 * the permission of UNIX System Laboratories, Inc.
40 *
41 * This code is derived from software contributed to Berkeley by
42 * Jan-Simon Pendry.
43 *
44 * Redistribution and use in source and binary forms, with or without
45 * modification, are permitted provided that the following conditions
46 * are met:
47 * 1. Redistributions of source code must retain the above copyright
48 * notice, this list of conditions and the following disclaimer.
49 * 2. Redistributions in binary form must reproduce the above copyright
50 * notice, this list of conditions and the following disclaimer in the
51 * documentation and/or other materials provided with the distribution.
52 * 3. Neither the name of the University nor the names of its contributors
53 * may be used to endorse or promote products derived from this software
54 * without specific prior written permission.
55 *
56 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
59 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
66 * SUCH DAMAGE.
67 *
68 * from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93
69 */
70
71/*-
72 * Copyright (c) 1993 Jan-Simon Pendry.
73 * Copyright (c) 1994 Christopher G. Demetriou. All rights reserved.
74 *
75 * This code is derived from software contributed to Berkeley by
76 * Jan-Simon Pendry.
77 *
78 * Redistribution and use in source and binary forms, with or without
79 * modification, are permitted provided that the following conditions
80 * are met:
81 * 1. Redistributions of source code must retain the above copyright
82 * notice, this list of conditions and the following disclaimer.
83 * 2. Redistributions in binary form must reproduce the above copyright
84 * notice, this list of conditions and the following disclaimer in the
85 * documentation and/or other materials provided with the distribution.
86 * 3. All advertising materials mentioning features or use of this software
87 * must display the following acknowledgement:
88 * This product includes software developed by the University of
89 * California, Berkeley and its contributors.
90 * 4. Neither the name of the University nor the names of its contributors
91 * may be used to endorse or promote products derived from this software
92 * without specific prior written permission.
93 *
94 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
95 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
96 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
97 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
98 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
99 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
100 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
101 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
102 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
103 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
104 * SUCH DAMAGE.
105 *
106 * from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93
107 */
108
109/*
110 * References:
111 * (1) Bach's "The Design of the UNIX Operating System",
112 * (2) sys/miscfs/procfs from UCB's 4.4BSD-Lite distribution,
113 * (3) the "4.4BSD Programmer's Reference Manual" published
114 * by USENIX and O'Reilly & Associates.
115 * The 4.4BSD PRM does a reasonably good job of documenting what the various
116 * ptrace() requests should actually do, and its text is quoted several times
117 * in this file.
118 */
119
120#include <sys/cdefs.h>
121__KERNEL_RCSID(0, "$NetBSD: sys_ptrace.c,v 1.2 2016/11/03 03:57:05 pgoyette Exp $");
122
123#ifdef _KERNEL_OPT
124#include "opt_ptrace.h"
125#endif
126
127#include <sys/param.h>
128#include <sys/systm.h>
129#include <sys/proc.h>
130#include <sys/errno.h>
131#include <sys/exec.h>
132#include <sys/pax.h>
133#include <sys/ptrace.h>
134#include <sys/uio.h>
135#include <sys/ras.h>
136#include <sys/kmem.h>
137#include <sys/kauth.h>
138#include <sys/mount.h>
139#include <sys/syscallargs.h>
140#include <sys/syscallvar.h>
141#include <sys/syscall.h>
142#include <sys/module.h>
143
144#include <uvm/uvm_extern.h>
145
146#include <machine/reg.h>
147
148/*
149 * PTRACE methods
150 */
151
152static int ptrace_copyinpiod(struct ptrace_io_desc *, const void *);
153static void ptrace_copyoutpiod(const struct ptrace_io_desc *, void *);
154
155static int
156ptrace_copyinpiod(struct ptrace_io_desc *piod, const void *addr)
157{
158 return copyin(addr, piod, sizeof(*piod));
159}
160
161static void
162ptrace_copyoutpiod(const struct ptrace_io_desc *piod, void *addr)
163{
164 (void) copyout(piod, addr, sizeof(*piod));
165}
166
167static struct ptrace_methods native_ptm = {
168 .ptm_copyinpiod = ptrace_copyinpiod,
169 .ptm_copyoutpiod = ptrace_copyoutpiod,
170 .ptm_doregs = process_doregs,
171 .ptm_dofpregs = process_dofpregs,
172};
173
174static const struct syscall_package ptrace_syscalls[] = {
175 { SYS_ptrace, 0, (sy_call_t *)sys_ptrace },
176 { 0, 0, NULL },
177};
178
179/*
180 * Process debugging system call.
181 */
182int
183sys_ptrace(struct lwp *l, const struct sys_ptrace_args *uap, register_t *retval)
184{
185 /* {
186 syscallarg(int) req;
187 syscallarg(pid_t) pid;
188 syscallarg(void *) addr;
189 syscallarg(int) data;
190 } */
191
192 return do_ptrace(&native_ptm, l, SCARG(uap, req), SCARG(uap, pid),
193 SCARG(uap, addr), SCARG(uap, data), retval);
194}
195
196#define DEPS "ptrace_common"
197
198MODULE(MODULE_CLASS_EXEC, ptrace, DEPS);
199
200static int
201ptrace_modcmd(modcmd_t cmd, void *arg)
202{
203 int error;
204
205 switch (cmd) {
206 case MODULE_CMD_INIT:
207 error = syscall_establish(&emul_netbsd, ptrace_syscalls);
208 break;
209 case MODULE_CMD_FINI:
210 error = syscall_disestablish(&emul_netbsd, ptrace_syscalls);
211 break;
212 default:
213 error = ENOTTY;
214 break;
215 }
216 return error;
217}
218