xref: /freebsd/sys/compat/linux/linux_signal.c (revision 8c2dd68caa963f1900a8228b0732b04f5d530ffa) 
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 1994-1995 Søren Schmidt
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 AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, 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 __FBSDID("$FreeBSD$");
31 
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/lock.h>
35 #include <sys/mutex.h>
36 #include <sys/sx.h>
37 #include <sys/proc.h>
38 #include <sys/signalvar.h>
39 #include <sys/syscallsubr.h>
40 #include <sys/sysproto.h>
41 
42 #include <security/audit/audit.h>
43 
44 #include "opt_compat.h"
45 
46 #ifdef COMPAT_LINUX32
47 #include <machine/../linux32/linux.h>
48 #include <machine/../linux32/linux32_proto.h>
49 #else
50 #include <machine/../linux/linux.h>
51 #include <machine/../linux/linux_proto.h>
52 #endif
53 #include <compat/linux/linux_mib.h>
54 #include <compat/linux/linux_signal.h>
55 #include <compat/linux/linux_timer.h>
56 #include <compat/linux/linux_util.h>
57 #include <compat/linux/linux_emul.h>
58 #include <compat/linux/linux_misc.h>
59 
60 static int	linux_do_tkill(struct thread *td, struct thread *tdt,
61 		    ksiginfo_t *ksi);
62 static void	sicode_to_lsicode(int si_code, int *lsi_code);
63 static int	linux_common_rt_sigtimedwait(struct thread *,
64 		    l_sigset_t *, struct timespec *, l_siginfo_t *,
65 		    l_size_t);
66 
67 static void
68 linux_to_bsd_sigaction(l_sigaction_t *lsa, struct sigaction *bsa)
69 {
70 	unsigned long flags;
71 
72 	linux_to_bsd_sigset(&lsa->lsa_mask, &bsa->sa_mask);
73 	bsa->sa_handler = PTRIN(lsa->lsa_handler);
74 	bsa->sa_flags = 0;
75 
76 	flags = lsa->lsa_flags;
77 	if (lsa->lsa_flags & LINUX_SA_NOCLDSTOP) {
78 		flags &= ~LINUX_SA_NOCLDSTOP;
79 		bsa->sa_flags |= SA_NOCLDSTOP;
80 	}
81 	if (lsa->lsa_flags & LINUX_SA_NOCLDWAIT) {
82 		flags &= ~LINUX_SA_NOCLDWAIT;
83 		bsa->sa_flags |= SA_NOCLDWAIT;
84 	}
85 	if (lsa->lsa_flags & LINUX_SA_SIGINFO) {
86 		flags &= ~LINUX_SA_SIGINFO;
87 		bsa->sa_flags |= SA_SIGINFO;
88 #ifdef notyet
89 		/*
90 		 * XXX: We seem to be missing code to convert
91 		 *      some of the fields in ucontext_t.
92 		 */
93 		linux_msg(curthread,
94 		    "partially unsupported sigaction flag SA_SIGINFO");
95 #endif
96 	}
97 	if (lsa->lsa_flags & LINUX_SA_RESTORER) {
98 		flags &= ~LINUX_SA_RESTORER;
99 		/* XXX: We might want to handle it; see Linux sigreturn(2). */
100 	}
101 	if (lsa->lsa_flags & LINUX_SA_ONSTACK) {
102 		flags &= ~LINUX_SA_ONSTACK;
103 		bsa->sa_flags |= SA_ONSTACK;
104 	}
105 	if (lsa->lsa_flags & LINUX_SA_RESTART) {
106 		flags &= ~LINUX_SA_RESTART;
107 		bsa->sa_flags |= SA_RESTART;
108 	}
109 	if (lsa->lsa_flags & LINUX_SA_INTERRUPT) {
110 		flags &= ~LINUX_SA_INTERRUPT;
111 		/* Documented to be a "historical no-op". */
112 	}
113 	if (lsa->lsa_flags & LINUX_SA_ONESHOT) {
114 		flags &= ~LINUX_SA_ONESHOT;
115 		bsa->sa_flags |= SA_RESETHAND;
116 	}
117 	if (lsa->lsa_flags & LINUX_SA_NOMASK) {
118 		flags &= ~LINUX_SA_NOMASK;
119 		bsa->sa_flags |= SA_NODEFER;
120 	}
121 
122 	if (flags != 0)
123 		linux_msg(curthread, "unsupported sigaction flag %#lx", flags);
124 }
125 
126 static void
127 bsd_to_linux_sigaction(struct sigaction *bsa, l_sigaction_t *lsa)
128 {
129 
130 	bsd_to_linux_sigset(&bsa->sa_mask, &lsa->lsa_mask);
131 #ifdef COMPAT_LINUX32
132 	lsa->lsa_handler = (uintptr_t)bsa->sa_handler;
133 #else
134 	lsa->lsa_handler = bsa->sa_handler;
135 #endif
136 	lsa->lsa_restorer = 0;		/* unsupported */
137 	lsa->lsa_flags = 0;
138 	if (bsa->sa_flags & SA_NOCLDSTOP)
139 		lsa->lsa_flags |= LINUX_SA_NOCLDSTOP;
140 	if (bsa->sa_flags & SA_NOCLDWAIT)
141 		lsa->lsa_flags |= LINUX_SA_NOCLDWAIT;
142 	if (bsa->sa_flags & SA_SIGINFO)
143 		lsa->lsa_flags |= LINUX_SA_SIGINFO;
144 	if (bsa->sa_flags & SA_ONSTACK)
145 		lsa->lsa_flags |= LINUX_SA_ONSTACK;
146 	if (bsa->sa_flags & SA_RESTART)
147 		lsa->lsa_flags |= LINUX_SA_RESTART;
148 	if (bsa->sa_flags & SA_RESETHAND)
149 		lsa->lsa_flags |= LINUX_SA_ONESHOT;
150 	if (bsa->sa_flags & SA_NODEFER)
151 		lsa->lsa_flags |= LINUX_SA_NOMASK;
152 }
153 
154 int
155 linux_do_sigaction(struct thread *td, int linux_sig, l_sigaction_t *linux_nsa,
156 		   l_sigaction_t *linux_osa)
157 {
158 	struct sigaction act, oact, *nsa, *osa;
159 	int error, sig;
160 
161 	if (!LINUX_SIG_VALID(linux_sig))
162 		return (EINVAL);
163 
164 	osa = (linux_osa != NULL) ? &oact : NULL;
165 	if (linux_nsa != NULL) {
166 		nsa = &act;
167 		linux_to_bsd_sigaction(linux_nsa, nsa);
168 	} else
169 		nsa = NULL;
170 	sig = linux_to_bsd_signal(linux_sig);
171 
172 	error = kern_sigaction(td, sig, nsa, osa, 0);
173 	if (error)
174 		return (error);
175 
176 	if (linux_osa != NULL)
177 		bsd_to_linux_sigaction(osa, linux_osa);
178 
179 	return (0);
180 }
181 
182 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
183 int
184 linux_signal(struct thread *td, struct linux_signal_args *args)
185 {
186 	l_sigaction_t nsa, osa;
187 	int error;
188 
189 	nsa.lsa_handler = args->handler;
190 	nsa.lsa_flags = LINUX_SA_ONESHOT | LINUX_SA_NOMASK;
191 	LINUX_SIGEMPTYSET(nsa.lsa_mask);
192 
193 	error = linux_do_sigaction(td, args->sig, &nsa, &osa);
194 	td->td_retval[0] = (int)(intptr_t)osa.lsa_handler;
195 
196 	return (error);
197 }
198 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
199 
200 int
201 linux_rt_sigaction(struct thread *td, struct linux_rt_sigaction_args *args)
202 {
203 	l_sigaction_t nsa, osa;
204 	int error;
205 
206 	if (args->sigsetsize != sizeof(l_sigset_t))
207 		return (EINVAL);
208 
209 	if (args->act != NULL) {
210 		error = copyin(args->act, &nsa, sizeof(l_sigaction_t));
211 		if (error)
212 			return (error);
213 	}
214 
215 	error = linux_do_sigaction(td, args->sig,
216 				   args->act ? &nsa : NULL,
217 				   args->oact ? &osa : NULL);
218 
219 	if (args->oact != NULL && !error) {
220 		error = copyout(&osa, args->oact, sizeof(l_sigaction_t));
221 	}
222 
223 	return (error);
224 }
225 
226 static int
227 linux_do_sigprocmask(struct thread *td, int how, l_sigset_t *new,
228 		     l_sigset_t *old)
229 {
230 	sigset_t omask, nmask;
231 	sigset_t *nmaskp;
232 	int error;
233 
234 	td->td_retval[0] = 0;
235 
236 	switch (how) {
237 	case LINUX_SIG_BLOCK:
238 		how = SIG_BLOCK;
239 		break;
240 	case LINUX_SIG_UNBLOCK:
241 		how = SIG_UNBLOCK;
242 		break;
243 	case LINUX_SIG_SETMASK:
244 		how = SIG_SETMASK;
245 		break;
246 	default:
247 		return (EINVAL);
248 	}
249 	if (new != NULL) {
250 		linux_to_bsd_sigset(new, &nmask);
251 		nmaskp = &nmask;
252 	} else
253 		nmaskp = NULL;
254 	error = kern_sigprocmask(td, how, nmaskp, &omask, 0);
255 	if (error == 0 && old != NULL)
256 		bsd_to_linux_sigset(&omask, old);
257 
258 	return (error);
259 }
260 
261 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
262 int
263 linux_sigprocmask(struct thread *td, struct linux_sigprocmask_args *args)
264 {
265 	l_osigset_t mask;
266 	l_sigset_t set, oset;
267 	int error;
268 
269 	if (args->mask != NULL) {
270 		error = copyin(args->mask, &mask, sizeof(l_osigset_t));
271 		if (error)
272 			return (error);
273 		LINUX_SIGEMPTYSET(set);
274 		set.__mask = mask;
275 	}
276 
277 	error = linux_do_sigprocmask(td, args->how,
278 				     args->mask ? &set : NULL,
279 				     args->omask ? &oset : NULL);
280 
281 	if (args->omask != NULL && !error) {
282 		mask = oset.__mask;
283 		error = copyout(&mask, args->omask, sizeof(l_osigset_t));
284 	}
285 
286 	return (error);
287 }
288 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
289 
290 int
291 linux_rt_sigprocmask(struct thread *td, struct linux_rt_sigprocmask_args *args)
292 {
293 	l_sigset_t set, oset;
294 	int error;
295 
296 	if (args->sigsetsize != sizeof(l_sigset_t))
297 		return (EINVAL);
298 
299 	if (args->mask != NULL) {
300 		error = copyin(args->mask, &set, sizeof(l_sigset_t));
301 		if (error)
302 			return (error);
303 	}
304 
305 	error = linux_do_sigprocmask(td, args->how,
306 				     args->mask ? &set : NULL,
307 				     args->omask ? &oset : NULL);
308 
309 	if (args->omask != NULL && !error) {
310 		error = copyout(&oset, args->omask, sizeof(l_sigset_t));
311 	}
312 
313 	return (error);
314 }
315 
316 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
317 int
318 linux_sgetmask(struct thread *td, struct linux_sgetmask_args *args)
319 {
320 	struct proc *p = td->td_proc;
321 	l_sigset_t mask;
322 
323 	PROC_LOCK(p);
324 	bsd_to_linux_sigset(&td->td_sigmask, &mask);
325 	PROC_UNLOCK(p);
326 	td->td_retval[0] = mask.__mask;
327 	return (0);
328 }
329 
330 int
331 linux_ssetmask(struct thread *td, struct linux_ssetmask_args *args)
332 {
333 	struct proc *p = td->td_proc;
334 	l_sigset_t lset;
335 	sigset_t bset;
336 
337 	PROC_LOCK(p);
338 	bsd_to_linux_sigset(&td->td_sigmask, &lset);
339 	td->td_retval[0] = lset.__mask;
340 	LINUX_SIGEMPTYSET(lset);
341 	lset.__mask = args->mask;
342 	linux_to_bsd_sigset(&lset, &bset);
343 	td->td_sigmask = bset;
344 	SIG_CANTMASK(td->td_sigmask);
345 	signotify(td);
346 	PROC_UNLOCK(p);
347 	return (0);
348 }
349 
350 int
351 linux_sigpending(struct thread *td, struct linux_sigpending_args *args)
352 {
353 	struct proc *p = td->td_proc;
354 	sigset_t bset;
355 	l_sigset_t lset;
356 	l_osigset_t mask;
357 
358 	PROC_LOCK(p);
359 	bset = p->p_siglist;
360 	SIGSETOR(bset, td->td_siglist);
361 	SIGSETAND(bset, td->td_sigmask);
362 	PROC_UNLOCK(p);
363 	bsd_to_linux_sigset(&bset, &lset);
364 	mask = lset.__mask;
365 	return (copyout(&mask, args->mask, sizeof(mask)));
366 }
367 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
368 
369 /*
370  * MPSAFE
371  */
372 int
373 linux_rt_sigpending(struct thread *td, struct linux_rt_sigpending_args *args)
374 {
375 	struct proc *p = td->td_proc;
376 	sigset_t bset;
377 	l_sigset_t lset;
378 
379 	if (args->sigsetsize > sizeof(lset))
380 		return (EINVAL);
381 		/* NOT REACHED */
382 
383 	PROC_LOCK(p);
384 	bset = p->p_siglist;
385 	SIGSETOR(bset, td->td_siglist);
386 	SIGSETAND(bset, td->td_sigmask);
387 	PROC_UNLOCK(p);
388 	bsd_to_linux_sigset(&bset, &lset);
389 	return (copyout(&lset, args->set, args->sigsetsize));
390 }
391 
392 int
393 linux_rt_sigtimedwait(struct thread *td,
394 	struct linux_rt_sigtimedwait_args *args)
395 {
396 	struct timespec ts, *tsa;
397 	struct l_timespec lts;
398 	int error;
399 
400 	if (args->timeout) {
401 		if ((error = copyin(args->timeout, &lts, sizeof(lts))))
402 			return (error);
403 		error = linux_to_native_timespec(&ts, &lts);
404 		if (error != 0)
405 			return (error);
406 		tsa = &ts;
407 	} else
408 		tsa = NULL;
409 
410 	return (linux_common_rt_sigtimedwait(td, args->mask, tsa,
411 	    args->ptr, args->sigsetsize));
412 }
413 
414 static int
415 linux_common_rt_sigtimedwait(struct thread *td, l_sigset_t *mask,
416     struct timespec *tsa, l_siginfo_t *ptr, l_size_t sigsetsize)
417 {
418 	int error, sig;
419 	l_sigset_t lset;
420 	sigset_t bset;
421 	l_siginfo_t lsi;
422 	ksiginfo_t ksi;
423 
424 	if (sigsetsize != sizeof(l_sigset_t))
425 		return (EINVAL);
426 
427 	if ((error = copyin(mask, &lset, sizeof(lset))))
428 		return (error);
429 	linux_to_bsd_sigset(&lset, &bset);
430 
431 	ksiginfo_init(&ksi);
432 	error = kern_sigtimedwait(td, bset, &ksi, tsa);
433 	if (error)
434 		return (error);
435 
436 	sig = bsd_to_linux_signal(ksi.ksi_signo);
437 
438 	if (ptr) {
439 		memset(&lsi, 0, sizeof(lsi));
440 		siginfo_to_lsiginfo(&ksi.ksi_info, &lsi, sig);
441 		error = copyout(&lsi, ptr, sizeof(lsi));
442 	}
443 	if (error == 0)
444 		td->td_retval[0] = sig;
445 
446 	return (error);
447 }
448 
449 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
450 int
451 linux_rt_sigtimedwait_time64(struct thread *td,
452 	struct linux_rt_sigtimedwait_time64_args *args)
453 {
454 	struct timespec ts, *tsa;
455 	struct l_timespec64 lts;
456 	int error;
457 
458 	if (args->timeout) {
459 		if ((error = copyin(args->timeout, &lts, sizeof(lts))))
460 			return (error);
461 		error = linux_to_native_timespec64(&ts, &lts);
462 		if (error != 0)
463 			return (error);
464 		tsa = &ts;
465 	} else
466 		tsa = NULL;
467 
468 	return (linux_common_rt_sigtimedwait(td, args->mask, tsa,
469 	    args->ptr, args->sigsetsize));
470 }
471 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
472 
473 int
474 linux_kill(struct thread *td, struct linux_kill_args *args)
475 {
476 	int l_signum;
477 
478 	/*
479 	 * Allow signal 0 as a means to check for privileges
480 	 */
481 	if (!LINUX_SIG_VALID(args->signum) && args->signum != 0)
482 		return (EINVAL);
483 
484 	if (args->signum > 0)
485 		l_signum = linux_to_bsd_signal(args->signum);
486 	else
487 		l_signum = 0;
488 
489 	return (kern_kill(td, args->pid, l_signum));
490 }
491 
492 static int
493 linux_do_tkill(struct thread *td, struct thread *tdt, ksiginfo_t *ksi)
494 {
495 	struct proc *p;
496 	int error;
497 
498 	p = tdt->td_proc;
499 	AUDIT_ARG_SIGNUM(ksi->ksi_signo);
500 	AUDIT_ARG_PID(p->p_pid);
501 	AUDIT_ARG_PROCESS(p);
502 
503 	error = p_cansignal(td, p, ksi->ksi_signo);
504 	if (error != 0 || ksi->ksi_signo == 0)
505 		goto out;
506 
507 	tdksignal(tdt, ksi->ksi_signo, ksi);
508 
509 out:
510 	PROC_UNLOCK(p);
511 	return (error);
512 }
513 
514 int
515 linux_tgkill(struct thread *td, struct linux_tgkill_args *args)
516 {
517 	struct thread *tdt;
518 	ksiginfo_t ksi;
519 	int sig;
520 
521 	if (args->pid <= 0 || args->tgid <=0)
522 		return (EINVAL);
523 
524 	/*
525 	 * Allow signal 0 as a means to check for privileges
526 	 */
527 	if (!LINUX_SIG_VALID(args->sig) && args->sig != 0)
528 		return (EINVAL);
529 
530 	if (args->sig > 0)
531 		sig = linux_to_bsd_signal(args->sig);
532 	else
533 		sig = 0;
534 
535 	tdt = linux_tdfind(td, args->pid, args->tgid);
536 	if (tdt == NULL)
537 		return (ESRCH);
538 
539 	ksiginfo_init(&ksi);
540 	ksi.ksi_signo = sig;
541 	ksi.ksi_code = SI_LWP;
542 	ksi.ksi_errno = 0;
543 	ksi.ksi_pid = td->td_proc->p_pid;
544 	ksi.ksi_uid = td->td_proc->p_ucred->cr_ruid;
545 	return (linux_do_tkill(td, tdt, &ksi));
546 }
547 
548 /*
549  * Deprecated since 2.5.75. Replaced by tgkill().
550  */
551 int
552 linux_tkill(struct thread *td, struct linux_tkill_args *args)
553 {
554 	struct thread *tdt;
555 	ksiginfo_t ksi;
556 	int sig;
557 
558 	if (args->tid <= 0)
559 		return (EINVAL);
560 
561 	if (!LINUX_SIG_VALID(args->sig))
562 		return (EINVAL);
563 
564 	sig = linux_to_bsd_signal(args->sig);
565 
566 	tdt = linux_tdfind(td, args->tid, -1);
567 	if (tdt == NULL)
568 		return (ESRCH);
569 
570 	ksiginfo_init(&ksi);
571 	ksi.ksi_signo = sig;
572 	ksi.ksi_code = SI_LWP;
573 	ksi.ksi_errno = 0;
574 	ksi.ksi_pid = td->td_proc->p_pid;
575 	ksi.ksi_uid = td->td_proc->p_ucred->cr_ruid;
576 	return (linux_do_tkill(td, tdt, &ksi));
577 }
578 
579 static void
580 sicode_to_lsicode(int si_code, int *lsi_code)
581 {
582 
583 	switch (si_code) {
584 	case SI_USER:
585 		*lsi_code = LINUX_SI_USER;
586 		break;
587 	case SI_KERNEL:
588 		*lsi_code = LINUX_SI_KERNEL;
589 		break;
590 	case SI_QUEUE:
591 		*lsi_code = LINUX_SI_QUEUE;
592 		break;
593 	case SI_TIMER:
594 		*lsi_code = LINUX_SI_TIMER;
595 		break;
596 	case SI_MESGQ:
597 		*lsi_code = LINUX_SI_MESGQ;
598 		break;
599 	case SI_ASYNCIO:
600 		*lsi_code = LINUX_SI_ASYNCIO;
601 		break;
602 	case SI_LWP:
603 		*lsi_code = LINUX_SI_TKILL;
604 		break;
605 	default:
606 		*lsi_code = si_code;
607 		break;
608 	}
609 }
610 
611 void
612 siginfo_to_lsiginfo(const siginfo_t *si, l_siginfo_t *lsi, l_int sig)
613 {
614 
615 	/* sig alredy converted */
616 	lsi->lsi_signo = sig;
617 	sicode_to_lsicode(si->si_code, &lsi->lsi_code);
618 
619 	switch (si->si_code) {
620 	case SI_LWP:
621 		lsi->lsi_pid = si->si_pid;
622 		lsi->lsi_uid = si->si_uid;
623 		break;
624 
625 	case SI_TIMER:
626 		lsi->lsi_int = si->si_value.sival_int;
627 		lsi->lsi_ptr = PTROUT(si->si_value.sival_ptr);
628 		lsi->lsi_tid = si->si_timerid;
629 		break;
630 
631 	case SI_QUEUE:
632 		lsi->lsi_pid = si->si_pid;
633 		lsi->lsi_uid = si->si_uid;
634 		lsi->lsi_ptr = PTROUT(si->si_value.sival_ptr);
635 		break;
636 
637 	case SI_ASYNCIO:
638 		lsi->lsi_int = si->si_value.sival_int;
639 		lsi->lsi_ptr = PTROUT(si->si_value.sival_ptr);
640 		break;
641 
642 	default:
643 		switch (sig) {
644 		case LINUX_SIGPOLL:
645 			/* XXX si_fd? */
646 			lsi->lsi_band = si->si_band;
647 			break;
648 
649 		case LINUX_SIGCHLD:
650 			lsi->lsi_errno = 0;
651 			lsi->lsi_pid = si->si_pid;
652 			lsi->lsi_uid = si->si_uid;
653 
654 			if (si->si_code == CLD_STOPPED)
655 				lsi->lsi_status = bsd_to_linux_signal(si->si_status);
656 			else if (si->si_code == CLD_CONTINUED)
657 				lsi->lsi_status = bsd_to_linux_signal(SIGCONT);
658 			else
659 				lsi->lsi_status = si->si_status;
660 			break;
661 
662 		case LINUX_SIGBUS:
663 		case LINUX_SIGILL:
664 		case LINUX_SIGFPE:
665 		case LINUX_SIGSEGV:
666 			lsi->lsi_addr = PTROUT(si->si_addr);
667 			break;
668 
669 		default:
670 			lsi->lsi_pid = si->si_pid;
671 			lsi->lsi_uid = si->si_uid;
672 			if (sig >= LINUX_SIGRTMIN) {
673 				lsi->lsi_int = si->si_value.sival_int;
674 				lsi->lsi_ptr = PTROUT(si->si_value.sival_ptr);
675 			}
676 			break;
677 		}
678 		break;
679 	}
680 }
681 
682 int
683 lsiginfo_to_siginfo(struct thread *td, const l_siginfo_t *lsi,
684     siginfo_t *si, int sig)
685 {
686 
687 	switch (lsi->lsi_code) {
688 	case LINUX_SI_TKILL:
689 		if (linux_kernver(td) >= LINUX_KERNVER_2006039) {
690 			linux_msg(td, "SI_TKILL forbidden since 2.6.39");
691 			return (EPERM);
692 		}
693 		si->si_code = SI_LWP;
694 	case LINUX_SI_QUEUE:
695 		si->si_code = SI_QUEUE;
696 		break;
697 	case LINUX_SI_TIMER:
698 		si->si_code = SI_TIMER;
699 		break;
700 	case LINUX_SI_MESGQ:
701 		si->si_code = SI_MESGQ;
702 		break;
703 	case LINUX_SI_ASYNCIO:
704 		si->si_code = SI_ASYNCIO;
705 		break;
706 	default:
707 		si->si_code = lsi->lsi_code;
708 		break;
709 	}
710 
711 	si->si_signo = sig;
712 	si->si_pid = td->td_proc->p_pid;
713 	si->si_uid = td->td_ucred->cr_ruid;
714 	si->si_value.sival_ptr = PTRIN(lsi->lsi_value.sival_ptr);
715 	return (0);
716 }
717 
718 int
719 linux_rt_sigqueueinfo(struct thread *td, struct linux_rt_sigqueueinfo_args *args)
720 {
721 	l_siginfo_t linfo;
722 	struct proc *p;
723 	ksiginfo_t ksi;
724 	int error;
725 	int sig;
726 
727 	if (!LINUX_SIG_VALID(args->sig))
728 		return (EINVAL);
729 
730 	error = copyin(args->info, &linfo, sizeof(linfo));
731 	if (error != 0)
732 		return (error);
733 
734 	if (linfo.lsi_code >= 0)
735 		/* SI_USER, SI_KERNEL */
736 		return (EPERM);
737 
738 	sig = linux_to_bsd_signal(args->sig);
739 	ksiginfo_init(&ksi);
740 	error = lsiginfo_to_siginfo(td, &linfo, &ksi.ksi_info, sig);
741 	if (error != 0)
742 		return (error);
743 
744 	error = ESRCH;
745 	if ((p = pfind_any(args->pid)) != NULL) {
746 		error = p_cansignal(td, p, sig);
747 		if (error != 0) {
748 			PROC_UNLOCK(p);
749 			return (error);
750 		}
751 		error = tdsendsignal(p, NULL, sig, &ksi);
752 		PROC_UNLOCK(p);
753 	}
754 
755 	return (error);
756 }
757 
758 int
759 linux_rt_tgsigqueueinfo(struct thread *td, struct linux_rt_tgsigqueueinfo_args *args)
760 {
761 	l_siginfo_t linfo;
762 	struct thread *tds;
763 	ksiginfo_t ksi;
764 	int error;
765 	int sig;
766 
767 	if (!LINUX_SIG_VALID(args->sig))
768 		return (EINVAL);
769 
770 	error = copyin(args->uinfo, &linfo, sizeof(linfo));
771 	if (error != 0)
772 		return (error);
773 
774 	if (linfo.lsi_code >= 0)
775 		return (EPERM);
776 
777 	sig = linux_to_bsd_signal(args->sig);
778 	ksiginfo_init(&ksi);
779 	error = lsiginfo_to_siginfo(td, &linfo, &ksi.ksi_info, sig);
780 	if (error != 0)
781 		return (error);
782 
783 	tds = linux_tdfind(td, args->tid, args->tgid);
784 	if (tds == NULL)
785 		return (ESRCH);
786 
787 	return (linux_do_tkill(td, tds, &ksi));
788 }
789