xref: /netbsd-src/sys/compat/netbsd32/netbsd32_signal.c (revision e89934bbf778a6d6d6894877c4da59d0c7835b0f) 
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 
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 KTRACE
230 static void
231 netbsd32_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 
272 void
273 netbsd32_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 
315 void
316 getucontext32(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 
349 int
350 netbsd32_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 
367 int
368 setucontext32(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 */
404 int
405 netbsd32_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 
428 static int
429 netbsd32_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 
439 static int
440 netbsd32_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 
454 static int
455 netbsd32_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 
465 int
466 netbsd32_____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 
486 int
487 netbsd32_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 
508 struct 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
517 void
518 netbsd32_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