kern_sig_16.c revision 1.2.38.1 1 1.2.38.1 pgoyette /* $NetBSD: kern_sig_16.c,v 1.2.38.1 2018/03/30 05:35:47 pgoyette Exp $ */
2 1.1 ad
3 1.1 ad /*-
4 1.1 ad * Copyright (c) 2006, 2007, 2008 The NetBSD Foundation, Inc.
5 1.1 ad * All rights reserved.
6 1.1 ad *
7 1.1 ad * This code is derived from software contributed to The NetBSD Foundation
8 1.1 ad * by Andrew Doran.
9 1.1 ad *
10 1.1 ad * Redistribution and use in source and binary forms, with or without
11 1.1 ad * modification, are permitted provided that the following conditions
12 1.1 ad * are met:
13 1.1 ad * 1. Redistributions of source code must retain the above copyright
14 1.1 ad * notice, this list of conditions and the following disclaimer.
15 1.1 ad * 2. Redistributions in binary form must reproduce the above copyright
16 1.1 ad * notice, this list of conditions and the following disclaimer in the
17 1.1 ad * documentation and/or other materials provided with the distribution.
18 1.1 ad *
19 1.1 ad * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 1.1 ad * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 1.1 ad * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 1.1 ad * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 1.1 ad * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 1.1 ad * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 1.1 ad * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 1.1 ad * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 1.1 ad * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 1.1 ad * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 1.1 ad * POSSIBILITY OF SUCH DAMAGE.
30 1.1 ad */
31 1.1 ad
32 1.1 ad /*
33 1.1 ad * Copyright (c) 1982, 1986, 1989, 1991, 1993
34 1.1 ad * The Regents of the University of California. All rights reserved.
35 1.1 ad * (c) UNIX System Laboratories, Inc.
36 1.1 ad * All or some portions of this file are derived from material licensed
37 1.1 ad * to the University of California by American Telephone and Telegraph
38 1.1 ad * Co. or Unix System Laboratories, Inc. and are reproduced herein with
39 1.1 ad * the permission of UNIX System Laboratories, Inc.
40 1.1 ad *
41 1.1 ad * Redistribution and use in source and binary forms, with or without
42 1.1 ad * modification, are permitted provided that the following conditions
43 1.1 ad * are met:
44 1.1 ad * 1. Redistributions of source code must retain the above copyright
45 1.1 ad * notice, this list of conditions and the following disclaimer.
46 1.1 ad * 2. Redistributions in binary form must reproduce the above copyright
47 1.1 ad * notice, this list of conditions and the following disclaimer in the
48 1.1 ad * documentation and/or other materials provided with the distribution.
49 1.1 ad * 3. Neither the name of the University nor the names of its contributors
50 1.1 ad * may be used to endorse or promote products derived from this software
51 1.1 ad * without specific prior written permission.
52 1.1 ad *
53 1.1 ad * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 1.1 ad * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 1.1 ad * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 1.1 ad * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 1.1 ad * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 1.1 ad * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 1.1 ad * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 1.1 ad * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 1.1 ad * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 1.1 ad * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63 1.1 ad * SUCH DAMAGE.
64 1.1 ad *
65 1.1 ad * @(#)kern_sig.c 8.14 (Berkeley) 5/14/95
66 1.1 ad */
67 1.1 ad
68 1.1 ad #include <sys/cdefs.h>
69 1.2.38.1 pgoyette __KERNEL_RCSID(0, "$NetBSD: kern_sig_16.c,v 1.2.38.1 2018/03/30 05:35:47 pgoyette Exp $");
70 1.1 ad
71 1.1 ad #include <sys/param.h>
72 1.1 ad #include <sys/kernel.h>
73 1.2.38.1 pgoyette #include <sys/rwlock.h>
74 1.1 ad #include <sys/signalvar.h>
75 1.1 ad #include <sys/proc.h>
76 1.1 ad #include <sys/pool.h>
77 1.2.38.1 pgoyette #include <sys/syscall.h>
78 1.2.38.1 pgoyette #include <sys/syscallvar.h>
79 1.1 ad #include <sys/syscallargs.h>
80 1.1 ad #include <sys/kauth.h>
81 1.1 ad #include <sys/wait.h>
82 1.1 ad #include <sys/kmem.h>
83 1.1 ad
84 1.2.38.1 pgoyette #include <compat/common/compat_mod.h>
85 1.2.38.1 pgoyette
86 1.2.38.1 pgoyette extern krwlock_t exec_lock;
87 1.2.38.1 pgoyette
88 1.2.38.1 pgoyette #if !defined(__amd64__) || defined(COMPAT_NETBSD32)
89 1.2.38.1 pgoyette #define COMPAT_SIGCONTEXT
90 1.2.38.1 pgoyette extern char sigcode[], esigcode[];
91 1.2.38.1 pgoyette struct uvm_object *emul_netbsd_object;
92 1.2.38.1 pgoyette #endif
93 1.2.38.1 pgoyette
94 1.2.38.1 pgoyette static const struct syscall_package kern_sig_16_syscalls[] = {
95 1.2.38.1 pgoyette #ifdef COMPAT_SIGCONTEXT
96 1.2.38.1 pgoyette { SYS_compat_16___sigaction14, 0,
97 1.2.38.1 pgoyette (sy_call_t *)compat_16_sys___sigaction14 },
98 1.2.38.1 pgoyette { SYS_compat_16___sigreturn14, 0,
99 1.2.38.1 pgoyette (sy_call_t *)compat_16_sys___sigreturn14 },
100 1.2.38.1 pgoyette #endif
101 1.2.38.1 pgoyette { 0, 0, NULL }
102 1.2.38.1 pgoyette };
103 1.2.38.1 pgoyette
104 1.1 ad int
105 1.2 rmind compat_16_sys___sigaction14(struct lwp *l,
106 1.2 rmind const struct compat_16_sys___sigaction14_args *uap, register_t *retval)
107 1.1 ad {
108 1.1 ad /* {
109 1.1 ad syscallarg(int) signum;
110 1.1 ad syscallarg(const struct sigaction *) nsa;
111 1.1 ad syscallarg(struct sigaction *) osa;
112 1.1 ad } */
113 1.1 ad struct sigaction nsa, osa;
114 1.1 ad int error;
115 1.1 ad
116 1.1 ad if (SCARG(uap, nsa)) {
117 1.1 ad error = copyin(SCARG(uap, nsa), &nsa, sizeof(nsa));
118 1.1 ad if (error)
119 1.1 ad return (error);
120 1.1 ad }
121 1.1 ad error = sigaction1(l, SCARG(uap, signum),
122 1.1 ad SCARG(uap, nsa) ? &nsa : 0, SCARG(uap, osa) ? &osa : 0,
123 1.1 ad NULL, 0);
124 1.1 ad if (error)
125 1.1 ad return (error);
126 1.1 ad if (SCARG(uap, osa)) {
127 1.1 ad error = copyout(&osa, SCARG(uap, osa), sizeof(osa));
128 1.1 ad if (error)
129 1.1 ad return (error);
130 1.1 ad }
131 1.1 ad return (0);
132 1.1 ad }
133 1.2.38.1 pgoyette
134 1.2.38.1 pgoyette int
135 1.2.38.1 pgoyette kern_sig_16_init(void)
136 1.2.38.1 pgoyette {
137 1.2.38.1 pgoyette int error;
138 1.2.38.1 pgoyette
139 1.2.38.1 pgoyette error = syscall_establish(NULL, kern_sig_16_syscalls);
140 1.2.38.1 pgoyette if (error)
141 1.2.38.1 pgoyette return error;
142 1.2.38.1 pgoyette #if defined(COMPAT_SIGCONTEXT)
143 1.2.38.1 pgoyette KASSERT(emul_netbsd.e_sigobject == NULL);
144 1.2.38.1 pgoyette rw_enter(&exec_lock, RW_WRITER);
145 1.2.38.1 pgoyette emul_netbsd.e_sigcode = sigcode;
146 1.2.38.1 pgoyette emul_netbsd.e_esigcode = esigcode;
147 1.2.38.1 pgoyette emul_netbsd.e_sigobject = &emul_netbsd_object;
148 1.2.38.1 pgoyette rw_exit(&exec_lock);
149 1.2.38.1 pgoyette KASSERT(sendsig_sigcontext_vec == NULL);
150 1.2.38.1 pgoyette sendsig_sigcontext_vec = sendsig_sigcontext;
151 1.2.38.1 pgoyette #endif
152 1.2.38.1 pgoyette
153 1.2.38.1 pgoyette return 0;
154 1.2.38.1 pgoyette }
155 1.2.38.1 pgoyette
156 1.2.38.1 pgoyette int
157 1.2.38.1 pgoyette kern_sig_16_fini(void)
158 1.2.38.1 pgoyette {
159 1.2.38.1 pgoyette proc_t *p;
160 1.2.38.1 pgoyette int error;
161 1.2.38.1 pgoyette
162 1.2.38.1 pgoyette error = syscall_disestablish(NULL, kern_sig_16_syscalls);
163 1.2.38.1 pgoyette if (error)
164 1.2.38.1 pgoyette return error;
165 1.2.38.1 pgoyette /*
166 1.2.38.1 pgoyette * Ensure sendsig_sigcontext() is not being used.
167 1.2.38.1 pgoyette * module_lock prevents the flag being set on any
168 1.2.38.1 pgoyette * further processes while we are here. See
169 1.2.38.1 pgoyette * sigaction1() for the opposing half.
170 1.2.38.1 pgoyette */
171 1.2.38.1 pgoyette mutex_enter(proc_lock);
172 1.2.38.1 pgoyette PROCLIST_FOREACH(p, &allproc) {
173 1.2.38.1 pgoyette if ((p->p_lflag & PL_SIGCOMPAT) != 0) {
174 1.2.38.1 pgoyette break;
175 1.2.38.1 pgoyette }
176 1.2.38.1 pgoyette }
177 1.2.38.1 pgoyette mutex_exit(proc_lock);
178 1.2.38.1 pgoyette if (p != NULL) {
179 1.2.38.1 pgoyette syscall_establish(NULL, kern_sig_16_syscalls);
180 1.2.38.1 pgoyette return EBUSY;
181 1.2.38.1 pgoyette }
182 1.2.38.1 pgoyette sendsig_sigcontext_vec = NULL;
183 1.2.38.1 pgoyette
184 1.2.38.1 pgoyette #if defined(COMPAT_SIGCONTEXT)
185 1.2.38.1 pgoyette /*
186 1.2.38.1 pgoyette * The sigobject may persist if still in use, but
187 1.2.38.1 pgoyette * is reference counted so will die eventually.
188 1.2.38.1 pgoyette */
189 1.2.38.1 pgoyette rw_enter(&exec_lock, RW_WRITER);
190 1.2.38.1 pgoyette if (emul_netbsd_object != NULL) {
191 1.2.38.1 pgoyette (*emul_netbsd_object->pgops->pgo_detach)(emul_netbsd_object);
192 1.2.38.1 pgoyette }
193 1.2.38.1 pgoyette emul_netbsd_object = NULL;
194 1.2.38.1 pgoyette emul_netbsd.e_sigcode = NULL;
195 1.2.38.1 pgoyette emul_netbsd.e_esigcode = NULL;
196 1.2.38.1 pgoyette emul_netbsd.e_sigobject = NULL;
197 1.2.38.1 pgoyette rw_exit(&exec_lock);
198 1.2.38.1 pgoyette #endif
199 1.2.38.1 pgoyette return 0;
200 1.2.38.1 pgoyette }
201 1.2.38.1 pgoyette
202