1 /* $NetBSD: kern_sig_13.c,v 1.22 2021/09/07 11:43:02 riastradh Exp $ */
2
3 /*-
4 * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Charles M. Hannum.
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 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: kern_sig_13.c,v 1.22 2021/09/07 11:43:02 riastradh Exp $");
34
35 #if defined(_KERNEL_OPT)
36 #include "opt_compat_netbsd.h"
37 #endif
38
39 #include <sys/param.h>
40 #include <sys/proc.h>
41 #include <sys/signal.h>
42 #include <sys/signalvar.h>
43 #include <sys/systm.h>
44
45 #include <sys/syscall.h>
46 #include <sys/syscallvar.h>
47 #include <sys/syscallargs.h>
48
49 #include <machine/limits.h>
50
51 #include <compat/sys/signal.h>
52 #include <compat/sys/signalvar.h>
53 #include <compat/common/compat_util.h>
54 #include <compat/common/compat_sigaltstack.h>
55 #include <compat/common/compat_mod.h>
56
57 static const struct syscall_package kern_sig_13_syscalls[] = {
58 { SYS_compat_13_sigaction13, 0, (sy_call_t *)compat_13_sys_sigaction },
59 { SYS_compat_13_sigaltstack13, 0,
60 (sy_call_t *)compat_13_sys_sigaltstack },
61 { SYS_compat_13_sigpending13, 0,
62 (sy_call_t *)compat_13_sys_sigpending },
63 { SYS_compat_13_sigprocmask13, 0,
64 (sy_call_t *)compat_13_sys_sigprocmask },
65 { SYS_compat_13_sigsuspend13, 0,
66 (sy_call_t *)compat_13_sys_sigsuspend },
67 /* compat_13_sigreturn13 is in MD code! */
68 { SYS_compat_13_sigreturn13, 0, (sy_call_t *)compat_13_sys_sigreturn },
69 { 0, 0, NULL }
70 };
71
72 void
native_sigset13_to_sigset(const sigset13_t * oss,sigset_t * ss)73 native_sigset13_to_sigset(const sigset13_t *oss, sigset_t *ss)
74 {
75
76 memset(ss, 0, sizeof(*ss));
77 ss->__bits[0] = *oss;
78 ss->__bits[1] = 0;
79 ss->__bits[2] = 0;
80 ss->__bits[3] = 0;
81 }
82
83 void
native_sigset_to_sigset13(const sigset_t * ss,sigset13_t * oss)84 native_sigset_to_sigset13(const sigset_t *ss, sigset13_t *oss)
85 {
86
87 *oss = ss->__bits[0];
88 }
89
90 void
native_sigaction13_to_sigaction(const struct sigaction13 * osa,struct sigaction * sa)91 native_sigaction13_to_sigaction(const struct sigaction13 *osa, struct sigaction *sa)
92 {
93
94 memset(sa, 0, sizeof(*sa));
95 sa->sa_handler = osa->osa_handler;
96 native_sigset13_to_sigset(&osa->osa_mask, &sa->sa_mask);
97 sa->sa_flags = osa->osa_flags;
98 }
99
100 void
native_sigaction_to_sigaction13(const struct sigaction * sa,struct sigaction13 * osa)101 native_sigaction_to_sigaction13(const struct sigaction *sa, struct sigaction13 *osa)
102 {
103
104 memset(osa, 0, sizeof(*osa));
105 osa->osa_handler = sa->sa_handler;
106 native_sigset_to_sigset13(&sa->sa_mask, &osa->osa_mask);
107 osa->osa_flags = sa->sa_flags;
108 }
109
110 int
compat_13_sys_sigaltstack(struct lwp * l,const struct compat_13_sys_sigaltstack_args * uap,register_t * retval)111 compat_13_sys_sigaltstack(struct lwp *l, const struct compat_13_sys_sigaltstack_args *uap, register_t *retval)
112 {
113 /* {
114 syscallarg(const struct sigaltstack13 *) nss;
115 syscallarg(struct sigaltstack13 *) oss;
116 } */
117 compat_sigaltstack(uap, sigaltstack13, SS_ONSTACK, SS_DISABLE);
118 }
119
120 int
compat_13_sys_sigaction(struct lwp * l,const struct compat_13_sys_sigaction_args * uap,register_t * retval)121 compat_13_sys_sigaction(struct lwp *l, const struct compat_13_sys_sigaction_args *uap, register_t *retval)
122 {
123 /* {
124 syscallarg(int) signum;
125 syscallarg(const struct sigaction13 *) nsa;
126 syscallarg(struct sigaction13 *) osa;
127 } */
128 struct sigaction13 nesa, oesa;
129 struct sigaction nbsa, obsa;
130 int error;
131
132 if (SCARG(uap, nsa)) {
133 error = copyin(SCARG(uap, nsa), &nesa, sizeof(nesa));
134 if (error)
135 return (error);
136 native_sigaction13_to_sigaction(&nesa, &nbsa);
137 }
138 error = sigaction1(l, SCARG(uap, signum),
139 SCARG(uap, nsa) ? &nbsa : 0, SCARG(uap, osa) ? &obsa : 0,
140 NULL, 0);
141 if (error)
142 return (error);
143 if (SCARG(uap, osa)) {
144 native_sigaction_to_sigaction13(&obsa, &oesa);
145 error = copyout(&oesa, SCARG(uap, osa), sizeof(oesa));
146 if (error)
147 return (error);
148 }
149 return (0);
150 }
151
152 int
compat_13_sys_sigprocmask(struct lwp * l,const struct compat_13_sys_sigprocmask_args * uap,register_t * retval)153 compat_13_sys_sigprocmask(struct lwp *l, const struct compat_13_sys_sigprocmask_args *uap, register_t *retval)
154 {
155 /* {
156 syscallarg(int) how;
157 syscallarg(int) mask;
158 } */
159 struct proc *p = l->l_proc;
160 sigset13_t ness, oess;
161 sigset_t nbss, obss;
162 int error;
163
164 ness = SCARG(uap, mask);
165 native_sigset13_to_sigset(&ness, &nbss);
166 mutex_enter(p->p_lock);
167 error = sigprocmask1(l, SCARG(uap, how), &nbss, &obss);
168 mutex_exit(p->p_lock);
169 if (error)
170 return (error);
171 native_sigset_to_sigset13(&obss, &oess);
172 *retval = oess;
173 return (0);
174 }
175
176 int
compat_13_sys_sigpending(struct lwp * l,const void * v,register_t * retval)177 compat_13_sys_sigpending(struct lwp *l, const void *v, register_t *retval)
178 {
179 sigset13_t ess;
180 sigset_t bss;
181
182 sigpending1(l, &bss);
183 native_sigset_to_sigset13(&bss, &ess);
184 *retval = ess;
185 return (0);
186 }
187
188 int
compat_13_sys_sigsuspend(struct lwp * l,const struct compat_13_sys_sigsuspend_args * uap,register_t * retval)189 compat_13_sys_sigsuspend(struct lwp *l, const struct compat_13_sys_sigsuspend_args *uap, register_t *retval)
190 {
191 /* {
192 syscallarg(sigset13_t) mask;
193 } */
194 sigset13_t ess;
195 sigset_t bss;
196
197 ess = SCARG(uap, mask);
198 native_sigset13_to_sigset(&ess, &bss);
199 return (sigsuspend1(l, &bss));
200 }
201
202 int
kern_sig_13_init(void)203 kern_sig_13_init(void)
204 {
205
206 return syscall_establish(NULL, kern_sig_13_syscalls);
207 }
208
209 int
kern_sig_13_fini(void)210 kern_sig_13_fini(void)
211 {
212
213 return syscall_disestablish(NULL, kern_sig_13_syscalls);
214 }
215