1/* $NetBSD: netbsd32_signal.c,v 1.43 2016/09/18 05:16:21 christos Exp $ */
2
3/*
4 * Copyright (c) 1998, 2001 Matthew R. Green
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: netbsd32_signal.c,v 1.43 2016/09/18 05:16:21 christos Exp $");
31
32#if defined(_KERNEL_OPT)
33#include "opt_ktrace.h"
34#endif
35
36#include <sys/param.h>
37#include <sys/systm.h>
38#include <sys/mount.h>
39#include <sys/stat.h>
40#include <sys/time.h>
41#include <sys/signalvar.h>
42#include <sys/ktrace.h>
43#include <sys/proc.h>
44#include <sys/wait.h>
45#include <sys/dirent.h>
46
47#include <uvm/uvm_extern.h>
48
49#include <compat/netbsd32/netbsd32.h>
50#include <compat/netbsd32/netbsd32_conv.h>
51#include <compat/netbsd32/netbsd32_syscallargs.h>
52
53#include <compat/sys/signal.h>
54#include <compat/sys/signalvar.h>
55#include <compat/sys/siginfo.h>
56#include <compat/sys/ucontext.h>
57#include <compat/common/compat_sigaltstack.h>
58
59int
60netbsd32_sigaction(struct lwp *l, const struct netbsd32_sigaction_args *uap, register_t *retval)
61{
62 /* {
63 syscallarg(int) signum;
64 syscallarg(const netbsd32_sigactionp_t) nsa;
65 syscallarg(netbsd32_sigactionp_t) osa;
66 } */
67 struct sigaction nsa, osa;
68 struct netbsd32_sigaction13 *sa32p, sa32;
69 int error;
70
71 if (SCARG_P32(uap, nsa)) {
72 sa32p = SCARG_P32(uap, nsa);
73 if (copyin(sa32p, &sa32, sizeof(sa32)))
74 return EFAULT;
75 nsa.sa_handler = (void *)NETBSD32PTR64(sa32.netbsd32_sa_handler);
76 memset(&nsa.sa_mask, 0, sizeof(nsa.sa_mask));
77 nsa.sa_mask.__bits[0] = sa32.netbsd32_sa_mask;
78 nsa.sa_flags = sa32.netbsd32_sa_flags;
79 }
80 error = sigaction1(l, SCARG(uap, signum),
81 SCARG_P32(uap, nsa) ? &nsa : 0,
82 SCARG_P32(uap, osa) ? &osa : 0,
83 NULL, 0);
84
85 if (error)
86 return (error);
87
88 if (SCARG_P32(uap, osa)) {
89 NETBSD32PTR32(sa32.netbsd32_sa_handler, osa.sa_handler);
90 sa32.netbsd32_sa_mask = osa.sa_mask.__bits[0];
91 sa32.netbsd32_sa_flags = osa.sa_flags;
92 sa32p = SCARG_P32(uap, osa);
93 if (copyout(&sa32, sa32p, sizeof(sa32)))
94 return EFAULT;
95 }
96
97 return (0);
98}
99
100int
101netbsd32___sigaltstack14(struct lwp *l, const struct netbsd32___sigaltstack14_args *uap, register_t *retval)
102{
103 /* {
104 syscallarg(const netbsd32_sigaltstackp_t) nss;
105 syscallarg(netbsd32_sigaltstackp_t) oss;
106 } */
107 compat_sigaltstack(uap, netbsd32_sigaltstack, SS_ONSTACK, SS_DISABLE);
108}
109
110/* ARGSUSED */
111int
112netbsd32___sigaction14(struct lwp *l, const struct netbsd32___sigaction14_args *uap, register_t *retval)
113{
114 /* {
115 syscallarg(int) signum;
116 syscallarg(const struct sigaction *) nsa;
117 syscallarg(struct sigaction *) osa;
118 } */
119 struct netbsd32_sigaction sa32;
120 struct sigaction nsa, osa;
121 int error;
122
123 if (SCARG_P32(uap, nsa)) {
124 error = copyin(SCARG_P32(uap, nsa), &sa32, sizeof(sa32));
125 if (error)
126 return (error);
127 nsa.sa_handler = NETBSD32PTR64(sa32.netbsd32_sa_handler);
128 nsa.sa_mask = sa32.netbsd32_sa_mask;
129 nsa.sa_flags = sa32.netbsd32_sa_flags;
130 }
131 error = sigaction1(l, SCARG(uap, signum),
132 SCARG_P32(uap, nsa) ? &nsa : 0,
133 SCARG_P32(uap, osa) ? &osa : 0,
134 NULL, 0);
135 if (error)
136 return (error);
137 if (SCARG_P32(uap, osa)) {
138 NETBSD32PTR32(sa32.netbsd32_sa_handler, osa.sa_handler);
139 sa32.netbsd32_sa_mask = osa.sa_mask;
140 sa32.netbsd32_sa_flags = osa.sa_flags;
141 error = copyout(&sa32, SCARG_P32(uap, osa), sizeof(sa32));
142 if (error)
143 return (error);
144 }
145 return (0);
146}
147
148/* ARGSUSED */
149int
150netbsd32___sigaction_sigtramp(struct lwp *l, const struct netbsd32___sigaction_sigtramp_args *uap, register_t *retval)
151{
152 /* {
153 syscallarg(int) signum;
154 syscallarg(const netbsd32_sigactionp_t) nsa;
155 syscallarg(netbsd32_sigactionp_t) osa;
156 syscallarg(netbsd32_voidp) tramp;
157 syscallarg(int) vers;
158 } */
159 struct netbsd32_sigaction sa32;
160 struct sigaction nsa, osa;
161 int error;
162
163 if (SCARG_P32(uap, nsa)) {
164 error = copyin(SCARG_P32(uap, nsa), &sa32, sizeof(sa32));
165 if (error)
166 return (error);
167 nsa.sa_handler = NETBSD32PTR64(sa32.netbsd32_sa_handler);
168 nsa.sa_mask = sa32.netbsd32_sa_mask;
169 nsa.sa_flags = sa32.netbsd32_sa_flags;
170 }
171 error = sigaction1(l, SCARG(uap, signum),
172 SCARG_P32(uap, nsa) ? &nsa : 0,
173 SCARG_P32(uap, osa) ? &osa : 0,
174 SCARG_P32(uap, tramp), SCARG(uap, vers));
175 if (error)
176 return (error);
177 if (SCARG_P32(uap, osa)) {
178 NETBSD32PTR32(sa32.netbsd32_sa_handler, osa.sa_handler);
179 sa32.netbsd32_sa_mask = osa.sa_mask;
180 sa32.netbsd32_sa_flags = osa.sa_flags;
181 error = copyout(&sa32, SCARG_P32(uap, osa), sizeof(sa32));
182 if (error)
183 return (error);
184 }
185 return (0);
186}
187
188void
189netbsd32_ksi32_to_ksi(struct _ksiginfo *si, const struct __ksiginfo32 *si32)
190{
191 memset(si, 0, sizeof (*si));
192 si->_signo = si32->_signo;
193 si->_code = si32->_code;
194 si->_errno = si32->_errno;
195
196 switch (si32->_signo) {
197 case SIGILL:
198 case SIGBUS:
199 case SIGSEGV:
200 case SIGFPE:
201 case SIGTRAP:
202 si->_reason._fault._addr =
203 NETBSD32IPTR64(si32->_reason._fault._addr);
204 si->_reason._fault._trap = si32->_reason._fault._trap;
205 break;
206 case SIGALRM:
207 case SIGVTALRM:
208 case SIGPROF:
209 default: /* see sigqueue() and kill1() */
210 si->_reason._rt._pid = si32->_reason._rt._pid;
211 si->_reason._rt._uid = si32->_reason._rt._uid;
212 si->_reason._rt._value.sival_int =
213 si32->_reason._rt._value.sival_int;
214 break;
215 case SIGCHLD:
216 si->_reason._child._pid = si32->_reason._child._pid;
217 si->_reason._child._uid = si32->_reason._child._uid;
218 si->_reason._child._utime = si32->_reason._child._utime;
219 si->_reason._child._stime = si32->_reason._child._stime;
220 break;
221 case SIGURG:
222 case SIGIO:
223 si->_reason._poll._band = si32->_reason._poll._band;
224 si->_reason._poll._fd = si32->_reason._poll._fd;
225 break;
226 }
227}
228
229#ifdef KTRACE
230static void
231netbsd32_ksi_to_ksi32(struct __ksiginfo32 *si32, const struct _ksiginfo *si)
232{
233 memset(si32, 0, sizeof (*si32));
234 si32->_signo = si->_signo;
235 si32->_code = si->_code;
236 si32->_errno = si->_errno;
237
238 switch (si->_signo) {
239 case SIGILL:
240 case SIGBUS:
241 case SIGSEGV:
242 case SIGFPE:
243 case SIGTRAP:
244 si32->_reason._fault._addr =
245 NETBSD32PTR32I(si->_reason._fault._addr);
246 si32->_reason._fault._trap = si->_reason._fault._trap;
247 break;
248 case SIGALRM:
249 case SIGVTALRM:
250 case SIGPROF:
251 default: /* see sigqueue() and kill1() */
252 si32->_reason._rt._pid = si->_reason._rt._pid;
253 si32->_reason._rt._uid = si->_reason._rt._uid;
254 si32->_reason._rt._value.sival_int =
255 si->_reason._rt._value.sival_int;
256 break;
257 case SIGCHLD:
258 si32->_reason._child._pid = si->_reason._child._pid;
259 si32->_reason._child._uid = si->_reason._child._uid;
260 si32->_reason._child._utime = si->_reason._child._utime;
261 si32->_reason._child._stime = si->_reason._child._stime;
262 break;
263 case SIGURG:
264 case SIGIO:
265 si32->_reason._poll._band = si->_reason._poll._band;
266 si32->_reason._poll._fd = si->_reason._poll._fd;
267 break;
268 }
269}
270#endif
271
272void
273netbsd32_si_to_si32(siginfo32_t *si32, const siginfo_t *si)
274{
275 memset(si32, 0, sizeof (*si32));
276 si32->si_signo = si->si_signo;
277 si32->si_code = si->si_code;
278 si32->si_errno = si->si_errno;
279
280 switch (si32->si_signo) {
281 case 0: /* SA */
282 si32->si_value.sival_int = si->si_value.sival_int;
283 break;
284 case SIGILL:
285 case SIGBUS:
286 case SIGSEGV:
287 case SIGFPE:
288 case SIGTRAP:
289 si32->si_addr = (uint32_t)(uintptr_t)si->si_addr;
290 si32->si_trap = si->si_trap;
291 break;
292 case SIGALRM:
293 case SIGVTALRM:
294 case SIGPROF:
295 default:
296 si32->si_pid = si->si_pid;
297 si32->si_uid = si->si_uid;
298 si32->si_value.sival_int = si->si_value.sival_int;
299 break;
300 case SIGCHLD:
301 si32->si_pid = si->si_pid;
302 si32->si_uid = si->si_uid;
303 si32->si_status = si->si_status;
304 si32->si_utime = si->si_utime;
305 si32->si_stime = si->si_stime;
306 break;
307 case SIGURG:
308 case SIGIO:
309 si32->si_band = si->si_band;
310 si32->si_fd = si->si_fd;
311 break;
312 }
313}
314
315void
316getucontext32(struct lwp *l, ucontext32_t *ucp)
317{
318 struct proc *p = l->l_proc;
319
320 KASSERT(mutex_owned(p->p_lock));
321
322 ucp->uc_flags = 0;
323 ucp->uc_link = (uint32_t)(intptr_t)l->l_ctxlink;
324 ucp->uc_sigmask = l->l_sigmask;
325 ucp->uc_flags |= _UC_SIGMASK;
326
327 /*
328 * The (unsupplied) definition of the `current execution stack'
329 * in the System V Interface Definition appears to allow returning
330 * the main context stack.
331 */
332 if ((l->l_sigstk.ss_flags & SS_ONSTACK) == 0) {
333 ucp->uc_stack.ss_sp = USRSTACK32;
334 ucp->uc_stack.ss_size = ctob(p->p_vmspace->vm_ssize);
335 ucp->uc_stack.ss_flags = 0; /* XXX, def. is Very Fishy */
336 } else {
337 /* Simply copy alternate signal execution stack. */
338 ucp->uc_stack.ss_sp =
339 (uint32_t)(intptr_t)l->l_sigstk.ss_sp;
340 ucp->uc_stack.ss_size = l->l_sigstk.ss_size;
341 ucp->uc_stack.ss_flags = l->l_sigstk.ss_flags;
342 }
343 ucp->uc_flags |= _UC_STACK;
344 mutex_exit(p->p_lock);
345 cpu_getmcontext32(l, &ucp->uc_mcontext, &ucp->uc_flags);
346 mutex_enter(p->p_lock);
347}
348
349int
350netbsd32_getcontext(struct lwp *l, const struct netbsd32_getcontext_args *uap, register_t *retval)
351{
352 /* {
353 syscallarg(netbsd32_ucontextp) ucp;
354 } */
355 struct proc *p = l->l_proc;
356 ucontext32_t uc;
357
358 memset(&uc, 0, sizeof(uc));
359
360 mutex_enter(p->p_lock);
361 getucontext32(l, &uc);
362 mutex_exit(p->p_lock);
363
364 return copyout(&uc, SCARG_P32(uap, ucp), sizeof (ucontext32_t));
365}
366
367int
368setucontext32(struct lwp *l, const ucontext32_t *ucp)
369{
370 struct proc *p = l->l_proc;
371 int error;
372
373 KASSERT(mutex_owned(p->p_lock));
374
375 if ((ucp->uc_flags & _UC_SIGMASK) != 0) {
376 error = sigprocmask1(l, SIG_SETMASK, &ucp->uc_sigmask, NULL);
377 if (error != 0)
378 return error;
379 }
380
381 mutex_exit(p->p_lock);
382 error = cpu_setmcontext32(l, &ucp->uc_mcontext, ucp->uc_flags);
383 mutex_enter(p->p_lock);
384 if (error != 0)
385 return (error);
386
387 l->l_ctxlink = (void *)(intptr_t)ucp->uc_link;
388
389 /*
390 * If there was stack information, update whether or not we are
391 * still running on an alternate signal stack.
392 */
393 if ((ucp->uc_flags & _UC_STACK) != 0) {
394 if (ucp->uc_stack.ss_flags & SS_ONSTACK)
395 l->l_sigstk.ss_flags |= SS_ONSTACK;
396 else
397 l->l_sigstk.ss_flags &= ~SS_ONSTACK;
398 }
399
400 return 0;
401}
402
403/* ARGSUSED */
404int
405netbsd32_setcontext(struct lwp *l, const struct netbsd32_setcontext_args *uap, register_t *retval)
406{
407 /* {
408 syscallarg(netbsd32_ucontextp) ucp;
409 } */
410 ucontext32_t uc;
411 int error;
412 struct proc *p = l->l_proc;
413
414 error = copyin(SCARG_P32(uap, ucp), &uc, sizeof (uc));
415 if (error)
416 return (error);
417 if (!(uc.uc_flags & _UC_CPU))
418 return (EINVAL);
419 mutex_enter(p->p_lock);
420 error = setucontext32(l, &uc);
421 mutex_exit(p->p_lock);
422 if (error)
423 return (error);
424
425 return (EJUSTRETURN);
426}
427
428static int
429netbsd32_sigtimedwait_put_info(const void *src, void *dst, size_t size)
430{
431 const siginfo_t *info = src;
432 siginfo32_t info32;
433
434 netbsd32_si_to_si32(&info32, info);
435
436 return copyout(&info32, dst, sizeof(info32));
437}
438
439static int
440netbsd32_sigtimedwait_fetch_timeout(const void *src, void *dst, size_t size)
441{
442 struct timespec *ts = dst;
443 struct netbsd32_timespec ts32;
444 int error;
445
446 error = copyin(src, &ts32, sizeof(ts32));
447 if (error)
448 return error;
449
450 netbsd32_to_timespec(&ts32, ts);
451 return 0;
452}
453
454static int
455netbsd32_sigtimedwait_put_timeout(const void *src, void *dst, size_t size)
456{
457 const struct timespec *ts = src;
458 struct netbsd32_timespec ts32;
459
460 netbsd32_from_timespec(ts, &ts32);
461
462 return copyout(&ts32, dst, sizeof(ts32));
463}
464
465int
466netbsd32_____sigtimedwait50(struct lwp *l, const struct netbsd32_____sigtimedwait50_args *uap, register_t *retval)
467{
468 /* {
469 syscallarg(netbsd32_sigsetp_t) set;
470 syscallarg(netbsd32_siginfop_t) info;
471 syscallarg(netbsd32_timespec50p_t) timeout;
472 } */
473 struct sys_____sigtimedwait50_args ua;
474
475 NETBSD32TOP_UAP(set, const sigset_t);
476 NETBSD32TOP_UAP(info, siginfo_t);
477 NETBSD32TOP_UAP(timeout, struct timespec);
478
479 return sigtimedwait1(l, &ua, retval,
480 copyin,
481 netbsd32_sigtimedwait_put_info,
482 netbsd32_sigtimedwait_fetch_timeout,
483 netbsd32_sigtimedwait_put_timeout);
484}
485
486int
487netbsd32_sigqueueinfo(struct lwp *l,
488 const struct netbsd32_sigqueueinfo_args *uap, register_t *retval)
489{
490 /* {
491 syscallarg(pid_t) pid;
492 syscallarg(const netbsd32_siginfop_t) info;
493 } */
494 struct __ksiginfo32 ksi32;
495 ksiginfo_t ksi;
496 int error;
497
498 if ((error = copyin(SCARG_P32(uap, info), &ksi32,
499 sizeof(ksi32))) != 0)
500 return error;
501
502 KSI_INIT(&ksi);
503 netbsd32_ksi32_to_ksi(&ksi.ksi_info, &ksi32);
504
505 return kill1(l, SCARG(uap, pid), &ksi, retval);
506}
507
508struct netbsd32_ktr_psig {
509 int signo;
510 netbsd32_pointer_t action;
511 sigset_t mask;
512 int code;
513 /* and optional siginfo_t */
514};
515
516#ifdef KTRACE
517void
518netbsd32_ktrpsig(int sig, sig_t action, const sigset_t *mask,
519 const ksiginfo_t *ksi)
520{
521 struct ktrace_entry *kte;
522 lwp_t *l = curlwp;
523 struct {
524 struct netbsd32_ktr_psig kp;
525 siginfo32_t si;
526 } *kbuf;
527
528 if (!KTRPOINT(l->l_proc, KTR_PSIG))
529 return;
530
531 if (ktealloc(&kte, (void *)&kbuf, l, KTR_PSIG, sizeof(*kbuf)))
532 return;
533
534 kbuf->kp.signo = (char)sig;
535 NETBSD32PTR32(kbuf->kp.action, action);
536 kbuf->kp.mask = *mask;
537
538 if (ksi) {
539 kbuf->kp.code = KSI_TRAPCODE(ksi);
540 (void)memset(&kbuf->si, 0, sizeof(kbuf->si));
541 netbsd32_ksi_to_ksi32(&kbuf->si._info, &ksi->ksi_info);
542 ktesethdrlen(kte, sizeof(*kbuf));
543 } else {
544 kbuf->kp.code = 0;
545 ktesethdrlen(kte, sizeof(struct netbsd32_ktr_psig));
546 }
547
548 ktraddentry(l, kte, KTA_WAITOK);
549}
550#endif
551
552
553