1 /* $NetBSD: kern_sig_43.c,v 1.38 2021/11/01 05:07:16 thorpej 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_43.c,v 1.38 2021/11/01 05:07:16 thorpej Exp $");
34
35 #if defined(_KERNEL_OPT)
36 #include "opt_compat_netbsd.h"
37 #endif
38
39 #include <sys/param.h>
40 #include <sys/signalvar.h>
41 #include <sys/resourcevar.h>
42 #include <sys/namei.h>
43 #include <sys/vnode.h>
44 #include <sys/proc.h>
45 #include <sys/systm.h>
46 #include <sys/timeb.h>
47 #include <sys/times.h>
48 #include <sys/buf.h>
49 #include <sys/acct.h>
50 #include <sys/file.h>
51 #include <sys/kernel.h>
52 #include <sys/wait.h>
53 #include <sys/ktrace.h>
54 #include <sys/syslog.h>
55 #include <sys/stat.h>
56 #include <sys/core.h>
57 #include <sys/kauth.h>
58
59 #include <sys/syscall.h>
60 #include <sys/syscallvar.h>
61 #include <sys/syscallargs.h>
62 #include <sys/compat_stub.h>
63
64 #include <sys/cpu.h>
65
66 #include <compat/sys/signal.h>
67 #include <compat/common/compat_mod.h>
68
69 void compat_43_sigmask_to_sigset(const int *, sigset_t *);
70 void compat_43_sigset_to_sigmask(const sigset_t *, int *);
71 void compat_43_sigvec_to_sigaction(const struct sigvec *, struct sigaction *);
72 void compat_43_sigaction_to_sigvec(const struct sigaction *, struct sigvec *);
73 void compat_43_sigstack_to_sigaltstack(const struct sigstack *, stack_t *);
74 void compat_43_sigaltstack_to_sigstack(const stack_t *, struct sigstack *);
75
76 static struct syscall_package kern_sig_43_syscalls[] = {
77 { SYS_compat_43_osigblock, 0, (sy_call_t *)compat_43_sys_sigblock },
78 { SYS_compat_43_osigsetmask, 0, (sy_call_t *)compat_43_sys_sigsetmask },
79 { SYS_compat_43_osigstack, 0, (sy_call_t *)compat_43_sys_sigstack },
80 { SYS_compat_43_osigvec, 0, (sy_call_t *)compat_43_sys_sigvec },
81 { SYS_compat_43_okillpg, 0, (sy_call_t *)compat_43_sys_killpg },
82 { 0, 0, NULL }
83 };
84
85 void
compat_43_sigmask_to_sigset(const int * sm,sigset_t * ss)86 compat_43_sigmask_to_sigset(const int *sm, sigset_t *ss)
87 {
88
89 memset(ss, 0, sizeof(*ss));
90 ss->__bits[0] = *sm;
91 ss->__bits[1] = 0;
92 ss->__bits[2] = 0;
93 ss->__bits[3] = 0;
94 }
95
96 void
compat_43_sigset_to_sigmask(const sigset_t * ss,int * sm)97 compat_43_sigset_to_sigmask(const sigset_t *ss, int *sm)
98 {
99
100 *sm = ss->__bits[0];
101 }
102
103 void
compat_43_sigvec_to_sigaction(const struct sigvec * sv,struct sigaction * sa)104 compat_43_sigvec_to_sigaction(const struct sigvec *sv, struct sigaction *sa)
105 {
106
107 memset(sa, 0, sizeof(*sa));
108 sa->sa_handler = sv->sv_handler;
109 compat_43_sigmask_to_sigset(&sv->sv_mask, &sa->sa_mask);
110 sa->sa_flags = sv->sv_flags ^ SA_RESTART;
111 }
112
113 void
compat_43_sigaction_to_sigvec(const struct sigaction * sa,struct sigvec * sv)114 compat_43_sigaction_to_sigvec(const struct sigaction *sa, struct sigvec *sv)
115 {
116
117 memset(sv, 0, sizeof(*sv));
118 sv->sv_handler = sa->sa_handler;
119 compat_43_sigset_to_sigmask(&sa->sa_mask, &sv->sv_mask);
120 sv->sv_flags = sa->sa_flags ^ SA_RESTART;
121 }
122
123 void
compat_43_sigstack_to_sigaltstack(const struct sigstack * ss,stack_t * sa)124 compat_43_sigstack_to_sigaltstack(const struct sigstack *ss, stack_t *sa)
125 {
126 memset(sa, 0, sizeof(*sa));
127 sa->ss_sp = ss->ss_sp;
128 sa->ss_size = SIGSTKSZ; /* Use the recommended size */
129 sa->ss_flags = 0;
130 if (ss->ss_onstack)
131 sa->ss_flags |= SS_ONSTACK;
132 }
133
134 void
compat_43_sigaltstack_to_sigstack(const stack_t * sa,struct sigstack * ss)135 compat_43_sigaltstack_to_sigstack(const stack_t *sa, struct sigstack *ss)
136 {
137 memset(ss, 0, sizeof(*ss));
138 ss->ss_sp = sa->ss_sp;
139 if (sa->ss_flags & SS_ONSTACK)
140 ss->ss_onstack = 1;
141 else
142 ss->ss_onstack = 0;
143 }
144
145 int
compat_43_sys_sigblock(struct lwp * l,const struct compat_43_sys_sigblock_args * uap,register_t * retval)146 compat_43_sys_sigblock(struct lwp *l, const struct compat_43_sys_sigblock_args *uap, register_t *retval)
147 {
148 /* {
149 syscallarg(int) mask;
150 } */
151 struct proc *p = l->l_proc;
152 int nsm, osm;
153 sigset_t nss, oss;
154 int error;
155
156 nsm = SCARG(uap, mask);
157 compat_43_sigmask_to_sigset(&nsm, &nss);
158 mutex_enter(p->p_lock);
159 error = sigprocmask1(l, SIG_BLOCK, &nss, &oss);
160 mutex_exit(p->p_lock);
161 if (error)
162 return (error);
163 compat_43_sigset_to_sigmask(&oss, &osm);
164 *retval = osm;
165 return (0);
166 }
167
168 int
compat_43_sys_sigsetmask(struct lwp * l,const struct compat_43_sys_sigsetmask_args * uap,register_t * retval)169 compat_43_sys_sigsetmask(struct lwp *l, const struct compat_43_sys_sigsetmask_args *uap, register_t *retval)
170 {
171 /* {
172 syscallarg(int) mask;
173 } */
174 struct proc *p = l->l_proc;
175 int nsm, osm;
176 sigset_t nss, oss;
177 int error;
178
179 nsm = SCARG(uap, mask);
180 compat_43_sigmask_to_sigset(&nsm, &nss);
181 mutex_enter(p->p_lock);
182 error = sigprocmask1(l, SIG_SETMASK, &nss, &oss);
183 mutex_exit(p->p_lock);
184 if (error)
185 return (error);
186 compat_43_sigset_to_sigmask(&oss, &osm);
187 *retval = osm;
188 return (0);
189 }
190
191 /* ARGSUSED */
192 int
compat_43_sys_sigstack(struct lwp * l,const struct compat_43_sys_sigstack_args * uap,register_t * retval)193 compat_43_sys_sigstack(struct lwp *l, const struct compat_43_sys_sigstack_args *uap, register_t *retval)
194 {
195 /* {
196 syscallarg(struct sigstack *) nss;
197 syscallarg(struct sigstack *) oss;
198 } */
199 struct sigstack nss, oss;
200 stack_t nsa, osa;
201 int error;
202
203 if (SCARG(uap, nss)) {
204 error = copyin(SCARG(uap, nss), &nss, sizeof(nss));
205 if (error)
206 return (error);
207 compat_43_sigstack_to_sigaltstack(&nss, &nsa);
208 }
209 error = sigaltstack1(l,
210 SCARG(uap, nss) ? &nsa : 0, SCARG(uap, oss) ? &osa : 0);
211 if (error)
212 return (error);
213 if (SCARG(uap, oss)) {
214 compat_43_sigaltstack_to_sigstack(&osa, &oss);
215 error = copyout(&oss, SCARG(uap, oss), sizeof(oss));
216 if (error)
217 return (error);
218 }
219 return (0);
220 }
221
222 /*
223 * Generalized interface signal handler, 4.3-compatible.
224 */
225 /* ARGSUSED */
226 int
compat_43_sys_sigvec(struct lwp * l,const struct compat_43_sys_sigvec_args * uap,register_t * retval)227 compat_43_sys_sigvec(struct lwp *l, const struct compat_43_sys_sigvec_args *uap, register_t *retval)
228 {
229 /* {
230 syscallarg(int) signum;
231 syscallarg(const struct sigvec *) nsv;
232 syscallarg(struct sigvec *) osv;
233 } */
234 struct sigvec nsv, osv;
235 struct sigaction nsa, osa;
236 int error;
237
238 if (SCARG(uap, nsv)) {
239 error = copyin(SCARG(uap, nsv), &nsv, sizeof(nsv));
240 if (error)
241 return (error);
242 compat_43_sigvec_to_sigaction(&nsv, &nsa);
243 }
244 error = sigaction1(l, SCARG(uap, signum),
245 SCARG(uap, nsv) ? &nsa : 0, SCARG(uap, osv) ? &osa : 0,
246 NULL, 0);
247 if (error)
248 return (error);
249 if (SCARG(uap, osv)) {
250 compat_43_sigaction_to_sigvec(&osa, &osv);
251 error = copyout(&osv, SCARG(uap, osv), sizeof(osv));
252 if (error)
253 return (error);
254 }
255 return (0);
256 }
257
258
259 /* ARGSUSED */
260 int
compat_43_sys_killpg(struct lwp * l,const struct compat_43_sys_killpg_args * uap,register_t * retval)261 compat_43_sys_killpg(struct lwp *l, const struct compat_43_sys_killpg_args *uap, register_t *retval)
262 {
263 /* {
264 syscallarg(int) pgid;
265 syscallarg(int) signum;
266 } */
267 ksiginfo_t ksi;
268 int pgid = SCARG(uap, pgid);
269
270 pgid &= kern_sig_43_pgid_mask;
271
272 if ((u_int)SCARG(uap, signum) >= NSIG)
273 return (EINVAL);
274 memset(&ksi, 0, sizeof(ksi));
275 ksi.ksi_signo = SCARG(uap, signum);
276 ksi.ksi_code = SI_USER;
277 ksi.ksi_pid = l->l_proc->p_pid;
278 ksi.ksi_uid = kauth_cred_geteuid(l->l_cred);
279 return killpg1(l, &ksi, pgid, 0);
280 }
281
282 int
kern_sig_43_init(void)283 kern_sig_43_init(void)
284 {
285
286 return syscall_establish(NULL, kern_sig_43_syscalls);
287 }
288
289 int
kern_sig_43_fini(void)290 kern_sig_43_fini(void)
291 {
292
293 return syscall_disestablish(NULL, kern_sig_43_syscalls);
294 }
295