1 /* $NetBSD: sys_ptrace.c,v 1.12 2022/07/10 14:07:55 riastradh 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 #include <sys/cdefs.h>
72 __KERNEL_RCSID(0, "$NetBSD: sys_ptrace.c,v 1.12 2022/07/10 14:07:55 riastradh Exp $");
73
74 #ifdef _KERNEL_OPT
75 #include "opt_ptrace.h"
76 #endif
77
78 #include <sys/param.h>
79 #include <sys/systm.h>
80 #include <sys/proc.h>
81 #include <sys/errno.h>
82 #include <sys/exec.h>
83 #include <sys/pax.h>
84 #include <sys/ptrace.h>
85 #include <sys/uio.h>
86 #include <sys/ras.h>
87 #include <sys/kmem.h>
88 #include <sys/kauth.h>
89 #include <sys/mount.h>
90 #include <sys/syscallargs.h>
91 #include <sys/syscallvar.h>
92 #include <sys/syscall.h>
93 #include <sys/module.h>
94
95 #include <uvm/uvm_extern.h>
96
97 #include <machine/reg.h>
98
99 /*
100 * PTRACE methods
101 */
102
103 static int
ptrace_copyin_piod(struct ptrace_io_desc * piod,const void * addr,size_t len)104 ptrace_copyin_piod(struct ptrace_io_desc *piod, const void *addr, size_t len)
105 {
106 if (len != 0 && sizeof(*piod) != len)
107 return EINVAL;
108
109 return copyin(addr, piod, sizeof(*piod));
110 }
111
112 static int
ptrace_copyout_piod(const struct ptrace_io_desc * piod,void * addr,size_t len)113 ptrace_copyout_piod(const struct ptrace_io_desc *piod, void *addr, size_t len)
114 {
115 if (len != 0 && sizeof(*piod) != len)
116 return EINVAL;
117
118 return copyout(piod, addr, sizeof(*piod));
119 }
120
121 static int
ptrace_copyin_siginfo(struct ptrace_siginfo * psi,const void * addr,size_t len)122 ptrace_copyin_siginfo(struct ptrace_siginfo *psi, const void *addr, size_t len)
123 {
124 if (sizeof(*psi) != len)
125 return EINVAL;
126
127 return copyin(addr, psi, sizeof(*psi));
128 }
129
130 static int
ptrace_copyout_siginfo(const struct ptrace_siginfo * psi,void * addr,size_t len)131 ptrace_copyout_siginfo(const struct ptrace_siginfo *psi, void *addr, size_t len)
132 {
133 if (sizeof(*psi) != len)
134 return EINVAL;
135
136 return copyout(psi, addr, sizeof(*psi));
137 }
138
139 static int
ptrace_copyout_lwpstatus(const struct ptrace_lwpstatus * pls,void * addr,size_t len)140 ptrace_copyout_lwpstatus(const struct ptrace_lwpstatus *pls, void *addr,
141 size_t len)
142 {
143
144 return copyout(pls, addr, len);
145 }
146
147 static struct ptrace_methods native_ptm = {
148 .ptm_copyin_piod = ptrace_copyin_piod,
149 .ptm_copyout_piod = ptrace_copyout_piod,
150 .ptm_copyin_siginfo = ptrace_copyin_siginfo,
151 .ptm_copyout_siginfo = ptrace_copyout_siginfo,
152 .ptm_copyout_lwpstatus = ptrace_copyout_lwpstatus,
153 .ptm_doregs = process_doregs,
154 .ptm_dofpregs = process_dofpregs,
155 .ptm_dodbregs = process_dodbregs,
156 };
157
158 static const struct syscall_package ptrace_syscalls[] = {
159 { SYS_ptrace, 0, (sy_call_t *)sys_ptrace },
160 { 0, 0, NULL },
161 };
162
163 /*
164 * Process debugging system call.
165 */
166 int
sys_ptrace(struct lwp * l,const struct sys_ptrace_args * uap,register_t * retval)167 sys_ptrace(struct lwp *l, const struct sys_ptrace_args *uap, register_t *retval)
168 {
169 /* {
170 syscallarg(int) req;
171 syscallarg(pid_t) pid;
172 syscallarg(void *) addr;
173 syscallarg(int) data;
174 } */
175
176 return do_ptrace(&native_ptm, l, SCARG(uap, req), SCARG(uap, pid),
177 SCARG(uap, addr), SCARG(uap, data), retval);
178 }
179
180 #define DEPS "ptrace_common"
181
182 MODULE(MODULE_CLASS_EXEC, ptrace, DEPS);
183
184 static int
ptrace_init(void)185 ptrace_init(void)
186 {
187 int error;
188
189 error = syscall_establish(&emul_netbsd, ptrace_syscalls);
190 return error;
191 }
192
193 static int
ptrace_fini(void)194 ptrace_fini(void)
195 {
196 int error;
197
198 error = syscall_disestablish(&emul_netbsd, ptrace_syscalls);
199 return error;
200 }
201
202
203 static int
ptrace_modcmd(modcmd_t cmd,void * arg)204 ptrace_modcmd(modcmd_t cmd, void *arg)
205 {
206 int error;
207
208 switch (cmd) {
209 case MODULE_CMD_INIT:
210 error = ptrace_init();
211 break;
212 case MODULE_CMD_FINI:
213 error = ptrace_fini();
214 break;
215 default:
216 error = ENOTTY;
217 break;
218 }
219 return error;
220 }
221