1 | /* $NetBSD: sys_process.c,v 1.175 2016/11/02 00:11:59 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_process.c,v 1.175 2016/11/02 00:11:59 pgoyette Exp $" ); |
122 | |
123 | #ifdef _KERNEL_OPT |
124 | #include "opt_ptrace.h" |
125 | #include "opt_ktrace.h" |
126 | #include "opt_pax.h" |
127 | #endif |
128 | |
129 | #include <sys/param.h> |
130 | #include <sys/systm.h> |
131 | #include <sys/proc.h> |
132 | #include <sys/errno.h> |
133 | #include <sys/exec.h> |
134 | #include <sys/pax.h> |
135 | #include <sys/ptrace.h> |
136 | #include <sys/uio.h> |
137 | #include <sys/ras.h> |
138 | #include <sys/kmem.h> |
139 | #include <sys/kauth.h> |
140 | #include <sys/mount.h> |
141 | #include <sys/syscallargs.h> |
142 | |
143 | #include <uvm/uvm_extern.h> |
144 | |
145 | #include <machine/reg.h> |
146 | |
147 | #if defined(KTRACE) || defined(PTRACE_HOOKS) |
148 | int |
149 | process_domem(struct lwp *curl /*tracer*/, |
150 | struct lwp *l /*traced*/, |
151 | struct uio *uio) |
152 | { |
153 | struct proc *p = l->l_proc; /* traced */ |
154 | struct vmspace *vm; |
155 | int error; |
156 | |
157 | size_t len; |
158 | #ifdef PMAP_NEED_PROCWR |
159 | vaddr_t addr; |
160 | #endif |
161 | |
162 | error = 0; |
163 | len = uio->uio_resid; |
164 | |
165 | if (len == 0) |
166 | return 0; |
167 | |
168 | #ifdef PMAP_NEED_PROCWR |
169 | addr = uio->uio_offset; |
170 | #endif |
171 | |
172 | vm = p->p_vmspace; |
173 | |
174 | mutex_enter(&vm->vm_map.misc_lock); |
175 | if ((l->l_flag & LW_WEXIT) || vm->vm_refcnt < 1) |
176 | error = EFAULT; |
177 | if (error == 0) |
178 | p->p_vmspace->vm_refcnt++; /* XXX */ |
179 | mutex_exit(&vm->vm_map.misc_lock); |
180 | if (error != 0) |
181 | return error; |
182 | error = uvm_io(&vm->vm_map, uio, pax_mprotect_prot(l)); |
183 | uvmspace_free(vm); |
184 | |
185 | #ifdef PMAP_NEED_PROCWR |
186 | if (error == 0 && uio->uio_rw == UIO_WRITE) |
187 | pmap_procwr(p, addr, len); |
188 | #endif |
189 | return error; |
190 | } |
191 | |
192 | void |
193 | process_stoptrace(void) |
194 | { |
195 | struct lwp *l = curlwp; |
196 | struct proc *p = l->l_proc, *pp; |
197 | |
198 | mutex_enter(proc_lock); |
199 | mutex_enter(p->p_lock); |
200 | pp = p->p_pptr; |
201 | if (pp->p_pid == 1) { |
202 | CLR(p->p_slflag, PSL_SYSCALL); /* XXXSMP */ |
203 | mutex_exit(p->p_lock); |
204 | mutex_exit(proc_lock); |
205 | return; |
206 | } |
207 | |
208 | p->p_xsig = SIGTRAP; |
209 | proc_stop(p, 1, SIGSTOP); |
210 | mutex_exit(proc_lock); |
211 | |
212 | if (sigispending(l, 0)) { |
213 | lwp_lock(l); |
214 | l->l_flag |= LW_PENDSIG; |
215 | lwp_unlock(l); |
216 | } |
217 | mutex_exit(p->p_lock); |
218 | } |
219 | #endif /* KTRACE || PTRACE_HOOKS */ |
220 | |
221 | /* |
222 | * Dummy routine so that ptrace_common module will fail to load if this |
223 | * routine is not defined. |
224 | */ |
225 | #if defined(PTRACE_HOOKS) |
226 | void |
227 | ptrace_hooks(void) |
228 | { |
229 | |
230 | } |
231 | #endif |
232 | |