xref: /netbsd-src/sys/compat/netbsd32/netbsd32_signal.c (revision deb6f0161a9109e7de9b519dc8dfb9478668dcdd) 
1 /*	$NetBSD: netbsd32_signal.c,v 1.45 2017/12/17 20:59:27 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 1.45 2017/12/17 20:59:27 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 
59 int
60 netbsd32_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 
100 int
101 netbsd32___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 */
111 int
112 netbsd32___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 */
149 int
150 netbsd32___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 
188 void
189 netbsd32_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 notyet
230 #ifdef KTRACE
231 static void
232 netbsd32_ksi_to_ksi32(struct __ksiginfo32 *si32, const struct _ksiginfo *si)
233 {
234 	memset(si32, 0, sizeof (*si32));
235 	si32->_signo = si->_signo;
236 	si32->_code = si->_code;
237 	si32->_errno = si->_errno;
238 
239 	switch (si->_signo) {
240 	case SIGILL:
241 	case SIGBUS:
242 	case SIGSEGV:
243 	case SIGFPE:
244 	case SIGTRAP:
245 		si32->_reason._fault._addr =
246 		    NETBSD32PTR32I(si->_reason._fault._addr);
247 		si32->_reason._fault._trap = si->_reason._fault._trap;
248 		break;
249 	case SIGALRM:
250 	case SIGVTALRM:
251 	case SIGPROF:
252 	default:	/* see sigqueue() and kill1() */
253 		si32->_reason._rt._pid = si->_reason._rt._pid;
254 		si32->_reason._rt._uid = si->_reason._rt._uid;
255 		si32->_reason._rt._value.sival_int =
256 		    si->_reason._rt._value.sival_int;
257 		break;
258 	case SIGCHLD:
259 		si32->_reason._child._pid = si->_reason._child._pid;
260 		si32->_reason._child._uid = si->_reason._child._uid;
261 		si32->_reason._child._utime = si->_reason._child._utime;
262 		si32->_reason._child._stime = si->_reason._child._stime;
263 		break;
264 	case SIGURG:
265 	case SIGIO:
266 		si32->_reason._poll._band = si->_reason._poll._band;
267 		si32->_reason._poll._fd = si->_reason._poll._fd;
268 		break;
269 	}
270 }
271 #endif
272 #endif
273 
274 void
275 netbsd32_si_to_si32(siginfo32_t *si32, const siginfo_t *si)
276 {
277 	memset(si32, 0, sizeof (*si32));
278 	si32->si_signo = si->si_signo;
279 	si32->si_code = si->si_code;
280 	si32->si_errno = si->si_errno;
281 
282 	switch (si32->si_signo) {
283 	case 0:	/* SA */
284 		si32->si_value.sival_int = si->si_value.sival_int;
285 		break;
286 	case SIGILL:
287 	case SIGBUS:
288 	case SIGSEGV:
289 	case SIGFPE:
290 	case SIGTRAP:
291 		si32->si_addr = (uint32_t)(uintptr_t)si->si_addr;
292 		si32->si_trap = si->si_trap;
293 		break;
294 	case SIGALRM:
295 	case SIGVTALRM:
296 	case SIGPROF:
297 	default:
298 		si32->si_pid = si->si_pid;
299 		si32->si_uid = si->si_uid;
300 		si32->si_value.sival_int = si->si_value.sival_int;
301 		break;
302 	case SIGCHLD:
303 		si32->si_pid = si->si_pid;
304 		si32->si_uid = si->si_uid;
305 		si32->si_status = si->si_status;
306 		si32->si_utime = si->si_utime;
307 		si32->si_stime = si->si_stime;
308 		break;
309 	case SIGURG:
310 	case SIGIO:
311 		si32->si_band = si->si_band;
312 		si32->si_fd = si->si_fd;
313 		break;
314 	}
315 }
316 
317 void
318 netbsd32_si32_to_si(siginfo_t *si, const siginfo32_t *si32)
319 {
320 	memset(si, 0, sizeof (*si));
321 	si->si_signo = si32->si_signo;
322 	si->si_code = si32->si_code;
323 	si->si_errno = si32->si_errno;
324 
325 	switch (si->si_signo) {
326 	case 0:	/* SA */
327 		si->si_value.sival_int = si32->si_value.sival_int;
328 		break;
329 	case SIGILL:
330 	case SIGBUS:
331 	case SIGSEGV:
332 	case SIGFPE:
333 	case SIGTRAP:
334 		si->si_addr = (void *)(uintptr_t)si32->si_addr;
335 		si->si_trap = si32->si_trap;
336 		break;
337 	case SIGALRM:
338 	case SIGVTALRM:
339 	case SIGPROF:
340 	default:
341 		si->si_pid = si32->si_pid;
342 		si->si_uid = si32->si_uid;
343 		si->si_value.sival_int = si32->si_value.sival_int;
344 		break;
345 	case SIGCHLD:
346 		si->si_pid = si32->si_pid;
347 		si->si_uid = si32->si_uid;
348 		si->si_status = si32->si_status;
349 		si->si_utime = si32->si_utime;
350 		si->si_stime = si32->si_stime;
351 		break;
352 	case SIGURG:
353 	case SIGIO:
354 		si->si_band = si32->si_band;
355 		si->si_fd = si32->si_fd;
356 		break;
357 	}
358 }
359 
360 void
361 getucontext32(struct lwp *l, ucontext32_t *ucp)
362 {
363 	struct proc *p = l->l_proc;
364 
365 	KASSERT(mutex_owned(p->p_lock));
366 
367 	ucp->uc_flags = 0;
368 	ucp->uc_link = (uint32_t)(intptr_t)l->l_ctxlink;
369 	ucp->uc_sigmask = l->l_sigmask;
370 	ucp->uc_flags |= _UC_SIGMASK;
371 
372 	/*
373 	 * The (unsupplied) definition of the `current execution stack'
374 	 * in the System V Interface Definition appears to allow returning
375 	 * the main context stack.
376 	 */
377 	if ((l->l_sigstk.ss_flags & SS_ONSTACK) == 0) {
378 		ucp->uc_stack.ss_sp = USRSTACK32;
379 		ucp->uc_stack.ss_size = ctob(p->p_vmspace->vm_ssize);
380 		ucp->uc_stack.ss_flags = 0;	/* XXX, def. is Very Fishy */
381 	} else {
382 		/* Simply copy alternate signal execution stack. */
383 		ucp->uc_stack.ss_sp =
384 		    (uint32_t)(intptr_t)l->l_sigstk.ss_sp;
385 		ucp->uc_stack.ss_size = l->l_sigstk.ss_size;
386 		ucp->uc_stack.ss_flags = l->l_sigstk.ss_flags;
387 	}
388 	ucp->uc_flags |= _UC_STACK;
389 	mutex_exit(p->p_lock);
390 	cpu_getmcontext32(l, &ucp->uc_mcontext, &ucp->uc_flags);
391 	mutex_enter(p->p_lock);
392 }
393 
394 int
395 netbsd32_getcontext(struct lwp *l, const struct netbsd32_getcontext_args *uap, register_t *retval)
396 {
397 	/* {
398 		syscallarg(netbsd32_ucontextp) ucp;
399 	} */
400 	struct proc *p = l->l_proc;
401 	ucontext32_t uc;
402 
403 	memset(&uc, 0, sizeof(uc));
404 
405 	mutex_enter(p->p_lock);
406 	getucontext32(l, &uc);
407 	mutex_exit(p->p_lock);
408 
409 	return copyout(&uc, SCARG_P32(uap, ucp), sizeof (ucontext32_t));
410 }
411 
412 int
413 setucontext32(struct lwp *l, const ucontext32_t *ucp)
414 {
415 	struct proc *p = l->l_proc;
416 	int error;
417 
418 	KASSERT(mutex_owned(p->p_lock));
419 
420 	if ((ucp->uc_flags & _UC_SIGMASK) != 0) {
421 		error = sigprocmask1(l, SIG_SETMASK, &ucp->uc_sigmask, NULL);
422 		if (error != 0)
423 			return error;
424 	}
425 
426 	mutex_exit(p->p_lock);
427 	error = cpu_setmcontext32(l, &ucp->uc_mcontext, ucp->uc_flags);
428 	mutex_enter(p->p_lock);
429 	if (error != 0)
430 		return (error);
431 
432 	l->l_ctxlink = (void *)(intptr_t)ucp->uc_link;
433 
434 	/*
435 	 * If there was stack information, update whether or not we are
436 	 * still running on an alternate signal stack.
437 	 */
438 	if ((ucp->uc_flags & _UC_STACK) != 0) {
439 		if (ucp->uc_stack.ss_flags & SS_ONSTACK)
440 			l->l_sigstk.ss_flags |= SS_ONSTACK;
441 		else
442 			l->l_sigstk.ss_flags &= ~SS_ONSTACK;
443 	}
444 
445 	return 0;
446 }
447 
448 /* ARGSUSED */
449 int
450 netbsd32_setcontext(struct lwp *l, const struct netbsd32_setcontext_args *uap, register_t *retval)
451 {
452 	/* {
453 		syscallarg(netbsd32_ucontextp) ucp;
454 	} */
455 	ucontext32_t uc;
456 	int error;
457 	struct proc *p = l->l_proc;
458 
459 	error = copyin(SCARG_P32(uap, ucp), &uc, sizeof (uc));
460 	if (error)
461 		return (error);
462 	if (!(uc.uc_flags & _UC_CPU))
463 		return (EINVAL);
464 	mutex_enter(p->p_lock);
465 	error = setucontext32(l, &uc);
466 	mutex_exit(p->p_lock);
467 	if (error)
468 		return (error);
469 
470 	return (EJUSTRETURN);
471 }
472 
473 static int
474 netbsd32_sigtimedwait_put_info(const void *src, void *dst, size_t size)
475 {
476 	const siginfo_t *info = src;
477 	siginfo32_t info32;
478 
479 	netbsd32_si_to_si32(&info32, info);
480 
481 	return copyout(&info32, dst, sizeof(info32));
482 }
483 
484 static int
485 netbsd32_sigtimedwait_fetch_timeout(const void *src, void *dst, size_t size)
486 {
487 	struct timespec *ts = dst;
488 	struct netbsd32_timespec ts32;
489 	int error;
490 
491 	error = copyin(src, &ts32, sizeof(ts32));
492 	if (error)
493 		return error;
494 
495 	netbsd32_to_timespec(&ts32, ts);
496 	return 0;
497 }
498 
499 static int
500 netbsd32_sigtimedwait_put_timeout(const void *src, void *dst, size_t size)
501 {
502 	const struct timespec *ts = src;
503 	struct netbsd32_timespec ts32;
504 
505 	netbsd32_from_timespec(ts, &ts32);
506 
507 	return copyout(&ts32, dst, sizeof(ts32));
508 }
509 
510 int
511 netbsd32_____sigtimedwait50(struct lwp *l, const struct netbsd32_____sigtimedwait50_args *uap, register_t *retval)
512 {
513 	/* {
514 		syscallarg(netbsd32_sigsetp_t) set;
515 		syscallarg(netbsd32_siginfop_t) info;
516 		syscallarg(netbsd32_timespec50p_t) timeout;
517 	} */
518 	struct sys_____sigtimedwait50_args ua;
519 
520 	NETBSD32TOP_UAP(set, const sigset_t);
521 	NETBSD32TOP_UAP(info, siginfo_t);
522 	NETBSD32TOP_UAP(timeout, struct timespec);
523 
524 	return sigtimedwait1(l, &ua, retval,
525 	    copyin,
526 	    netbsd32_sigtimedwait_put_info,
527 	    netbsd32_sigtimedwait_fetch_timeout,
528 	    netbsd32_sigtimedwait_put_timeout);
529 }
530 
531 int
532 netbsd32_sigqueueinfo(struct lwp *l,
533     const struct netbsd32_sigqueueinfo_args *uap, register_t *retval)
534 {
535 	/* {
536 		syscallarg(pid_t) pid;
537 		syscallarg(const netbsd32_siginfop_t) info;
538 	} */
539 	struct __ksiginfo32 ksi32;
540 	ksiginfo_t ksi;
541 	int error;
542 
543 	if ((error = copyin(SCARG_P32(uap, info), &ksi32,
544 	    sizeof(ksi32))) != 0)
545 		return error;
546 
547 	KSI_INIT(&ksi);
548 	netbsd32_ksi32_to_ksi(&ksi.ksi_info, &ksi32);
549 
550 	return kill1(l, SCARG(uap, pid), &ksi, retval);
551 }
552 
553 struct netbsd32_ktr_psig {
554 	int			signo;
555 	netbsd32_pointer_t	action;
556 	sigset_t		mask;
557 	int			code;
558 	/* and optional siginfo_t */
559 };
560 
561 #ifdef notyet
562 #ifdef KTRACE
563 void
564 netbsd32_ktrpsig(int sig, sig_t action, const sigset_t *mask,
565 	 const ksiginfo_t *ksi)
566 {
567 	struct ktrace_entry *kte;
568 	lwp_t *l = curlwp;
569 	struct {
570 		struct netbsd32_ktr_psig	kp;
571 		siginfo32_t			si;
572 	} *kbuf;
573 
574 	if (!KTRPOINT(l->l_proc, KTR_PSIG))
575 		return;
576 
577 	if (ktealloc(&kte, (void *)&kbuf, l, KTR_PSIG, sizeof(*kbuf)))
578 		return;
579 
580 	kbuf->kp.signo = (char)sig;
581 	NETBSD32PTR32(kbuf->kp.action, action);
582 	kbuf->kp.mask = *mask;
583 
584 	if (ksi) {
585 		kbuf->kp.code = KSI_TRAPCODE(ksi);
586 		(void)memset(&kbuf->si, 0, sizeof(kbuf->si));
587 		netbsd32_ksi_to_ksi32(&kbuf->si._info, &ksi->ksi_info);
588 		ktesethdrlen(kte, sizeof(*kbuf));
589 	} else {
590 		kbuf->kp.code = 0;
591 		ktesethdrlen(kte, sizeof(struct netbsd32_ktr_psig));
592 	}
593 
594 	ktraddentry(l, kte, KTA_WAITOK);
595 }
596 #endif
597 #endif
598