1 /* $NetBSD: kern_sig_16.c,v 1.10 2024/12/10 10:52:05 mlelstv Exp $ */
2
3 /*-
4 * Copyright (c) 2006, 2007, 2008 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, 1991, 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 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
43 * are met:
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
49 * 3. Neither the name of the University nor the names of its contributors
50 * may be used to endorse or promote products derived from this software
51 * without specific prior written permission.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63 * SUCH DAMAGE.
64 *
65 * @(#)kern_sig.c 8.14 (Berkeley) 5/14/95
66 */
67
68 #include <sys/cdefs.h>
69 __KERNEL_RCSID(0, "$NetBSD: kern_sig_16.c,v 1.10 2024/12/10 10:52:05 mlelstv Exp $");
70
71 #if defined(_KERNEL_OPT)
72 #include "opt_compat_netbsd.h"
73 #endif
74
75 #include <sys/param.h>
76 #include <sys/exec.h>
77 #include <sys/kernel.h>
78 #include <sys/rwlock.h>
79 #include <sys/signalvar.h>
80 #include <sys/proc.h>
81 #include <sys/pool.h>
82 #include <sys/syscall.h>
83 #include <sys/syscallvar.h>
84 #include <sys/syscallargs.h>
85 #include <sys/kauth.h>
86 #include <sys/wait.h>
87 #include <sys/kmem.h>
88 #include <sys/compat_stub.h>
89
90 #include <uvm/uvm_object.h>
91 #include <uvm/uvm_prot.h>
92 #include <uvm/uvm_pager.h>
93
94 #include <compat/common/compat_mod.h>
95
96 #ifdef COMPAT_NETBSD32
97 # ifndef __aarch64__
98 # define COMPAT_SIGCONTEXT
99 # endif
100 #else /* COMPAT_NETBSD32 */
101 # if !defined(__amd64__) && !defined(__aarch64__)
102 # define COMPAT_SIGCONTEXT
103 # endif
104 #endif /* COMPAT_NETBSD32 */
105
106 #ifdef COMPAT_SIGCONTEXT
107 extern char sigcode[], esigcode[];
108 struct uvm_object *emul_netbsd_object;
109 #endif
110
111 static const struct syscall_package kern_sig_16_syscalls[] = {
112 #ifdef COMPAT_SIGCONTEXT
113 { SYS_compat_16___sigaction14, 0,
114 (sy_call_t *)compat_16_sys___sigaction14 },
115 /* compat_16_sigreturn14 is in MD code! */
116 { SYS_compat_16___sigreturn14, 0,
117 (sy_call_t *)compat_16_sys___sigreturn14 },
118 #endif
119 { 0, 0, NULL }
120 };
121
122 int
compat_16_sys___sigaction14(struct lwp * l,const struct compat_16_sys___sigaction14_args * uap,register_t * retval)123 compat_16_sys___sigaction14(struct lwp *l,
124 const struct compat_16_sys___sigaction14_args *uap, register_t *retval)
125 {
126 /* {
127 syscallarg(int) signum;
128 syscallarg(const struct sigaction *) nsa;
129 syscallarg(struct sigaction *) osa;
130 } */
131 struct sigaction nsa, osa;
132 int error;
133
134 if (SCARG(uap, nsa)) {
135 error = copyin(SCARG(uap, nsa), &nsa, sizeof(nsa));
136 if (error)
137 return (error);
138 }
139 error = sigaction1(l, SCARG(uap, signum),
140 SCARG(uap, nsa) ? &nsa : 0, SCARG(uap, osa) ? &osa : 0,
141 NULL, 0);
142 if (error)
143 return (error);
144 if (SCARG(uap, osa)) {
145 error = copyout(&osa, SCARG(uap, osa), sizeof(osa));
146 if (error)
147 return (error);
148 }
149 return (0);
150 }
151
152 int
kern_sig_16_init(void)153 kern_sig_16_init(void)
154 {
155 int error;
156
157 error = syscall_establish(NULL, kern_sig_16_syscalls);
158 if (error)
159 return error;
160 #if defined(COMPAT_SIGCONTEXT)
161 KASSERT(emul_netbsd.e_sigobject == NULL);
162 rw_enter(&exec_lock, RW_WRITER);
163 emul_netbsd.e_sigcode = sigcode;
164 emul_netbsd.e_esigcode = esigcode;
165 emul_netbsd.e_sigobject = &emul_netbsd_object;
166 error = exec_sigcode_alloc(&emul_netbsd);
167 if (error) {
168 emul_netbsd.e_sigcode = NULL;
169 emul_netbsd.e_esigcode = NULL;
170 emul_netbsd.e_sigobject = NULL;
171 }
172 rw_exit(&exec_lock);
173 if (error)
174 return error;
175 MODULE_HOOK_SET(sendsig_sigcontext_16_hook, sendsig_sigcontext);
176 #endif
177
178 return 0;
179 }
180
181 int
kern_sig_16_fini(void)182 kern_sig_16_fini(void)
183 {
184 proc_t *p;
185 int error;
186
187 error = syscall_disestablish(NULL, kern_sig_16_syscalls);
188 if (error)
189 return error;
190 /*
191 * Ensure sendsig_sigcontext() is not being used.
192 * module_lock prevents the flag being set on any
193 * further processes while we are here. See
194 * sigaction1() for the opposing half.
195 */
196 mutex_enter(&proc_lock);
197 PROCLIST_FOREACH(p, &allproc) {
198 if ((p->p_lflag & PL_SIGCOMPAT) != 0) {
199 break;
200 }
201 }
202 mutex_exit(&proc_lock);
203 if (p != NULL) {
204 syscall_establish(NULL, kern_sig_16_syscalls);
205 return EBUSY;
206 }
207
208 #if defined(COMPAT_SIGCONTEXT)
209 /*
210 * The sigobject may persist if still in use, but
211 * is reference counted so will die eventually.
212 */
213 rw_enter(&exec_lock, RW_WRITER);
214 exec_sigcode_free(&emul_netbsd);
215 emul_netbsd_object = NULL;
216 emul_netbsd.e_sigcode = NULL;
217 emul_netbsd.e_esigcode = NULL;
218 emul_netbsd.e_sigobject = NULL;
219 rw_exit(&exec_lock);
220
221 MODULE_HOOK_UNSET(sendsig_sigcontext_16_hook);
222 #endif
223 return 0;
224 }
225
226