xref: /netbsd-src/sys/compat/linux/common/linux_signal.c (revision aad9773e38ed2370a628a6416e098f9008fc10a7) 
1 /*	$NetBSD: linux_signal.c,v 1.76 2014/11/09 17:48:08 maxv Exp $	*/
2 
3 /*-
4  * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Frank van der Linden and Eric Haszlakiewicz.
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  * heavily from: svr4_signal.c,v 1.7 1995/01/09 01:04:21 christos Exp
33  */
34 
35 /*
36  *   Functions in multiarch:
37  *	linux_sys_signal	: linux_sig_notalpha.c
38  *	linux_sys_siggetmask	: linux_sig_notalpha.c
39  *	linux_sys_sigsetmask	: linux_sig_notalpha.c
40  *	linux_sys_pause		: linux_sig_notalpha.c
41  *	linux_sys_sigaction	: linux_sigaction.c
42  *
43  */
44 
45 /*
46  *   Unimplemented:
47  *	linux_sys_rt_sigtimedwait	: sigsuspend w/timeout.
48  */
49 
50 #include <sys/cdefs.h>
51 __KERNEL_RCSID(0, "$NetBSD: linux_signal.c,v 1.76 2014/11/09 17:48:08 maxv Exp $");
52 
53 #define COMPAT_LINUX 1
54 
55 #include <sys/param.h>
56 #include <sys/systm.h>
57 #include <sys/namei.h>
58 #include <sys/proc.h>
59 #include <sys/filedesc.h>
60 #include <sys/ioctl.h>
61 #include <sys/mount.h>
62 #include <sys/kernel.h>
63 #include <sys/signal.h>
64 #include <sys/signalvar.h>
65 #include <sys/wait.h>
66 
67 #include <sys/syscallargs.h>
68 
69 #include <compat/linux/common/linux_types.h>
70 #include <compat/linux/common/linux_signal.h>
71 #include <compat/linux/common/linux_emuldata.h>
72 #include <compat/linux/common/linux_siginfo.h>
73 #include <compat/linux/common/linux_sigevent.h>
74 #include <compat/linux/common/linux_util.h>
75 #include <compat/linux/common/linux_ipc.h>
76 #include <compat/linux/common/linux_sem.h>
77 #include <compat/linux/common/linux_errno.h>
78 #include <compat/linux/common/linux_sched.h>
79 
80 #include <compat/linux/linux_syscallargs.h>
81 
82 /* Locally used defines (in bsd<->linux conversion functions): */
83 #define	linux_sigemptyset(s)	memset((s), 0, sizeof(*(s)))
84 #define	linux_sigismember(s, n)	((s)->sig[((n) - 1) / LINUX__NSIG_BPW]	\
85 					& (1L << ((n) - 1) % LINUX__NSIG_BPW))
86 #define	linux_sigaddset(s, n)	((s)->sig[((n) - 1) / LINUX__NSIG_BPW]	\
87 					|= (1L << ((n) - 1) % LINUX__NSIG_BPW))
88 
89 #ifdef DEBUG_LINUX
90 #define DPRINTF(a)	uprintf a
91 #else
92 #define DPRINTF(a)
93 #endif
94 
95 extern const int native_to_linux_signo[];
96 extern const int linux_to_native_signo[];
97 
98 /*
99  * Convert between Linux and BSD signal sets.
100  */
101 #if LINUX__NSIG_WORDS > 1
102 void
103 linux_old_extra_to_native_sigset(sigset_t *bss, const linux_old_sigset_t *lss, const unsigned long *extra)
104 {
105 	linux_sigset_t lsnew;
106 
107 	/* convert old sigset to new sigset */
108 	linux_sigemptyset(&lsnew);
109 	lsnew.sig[0] = *lss;
110 	if (extra)
111 		memcpy(&lsnew.sig[1], extra,
112 		    sizeof(linux_sigset_t) - sizeof(linux_old_sigset_t));
113 
114 	linux_to_native_sigset(bss, &lsnew);
115 }
116 
117 void
118 native_to_linux_old_extra_sigset(linux_old_sigset_t *lss, unsigned long *extra, const sigset_t *bss)
119 {
120 	linux_sigset_t lsnew;
121 
122 	native_to_linux_sigset(&lsnew, bss);
123 
124 	/* convert new sigset to old sigset */
125 	*lss = lsnew.sig[0];
126 	if (extra)
127 		memcpy(extra, &lsnew.sig[1],
128 		    sizeof(linux_sigset_t) - sizeof(linux_old_sigset_t));
129 }
130 #endif /* LINUX__NSIG_WORDS > 1 */
131 
132 void
133 linux_to_native_sigset(sigset_t *bss, const linux_sigset_t *lss)
134 {
135 	int i, newsig;
136 
137 	sigemptyset(bss);
138 	for (i = 1; i < LINUX__NSIG; i++) {
139 		if (linux_sigismember(lss, i)) {
140 			newsig = linux_to_native_signo[i];
141 			if (newsig)
142 				sigaddset(bss, newsig);
143 		}
144 	}
145 }
146 
147 void
148 native_to_linux_sigset(linux_sigset_t *lss, const sigset_t *bss)
149 {
150 	int i, newsig;
151 
152 	linux_sigemptyset(lss);
153 	for (i = 1; i < NSIG; i++) {
154 		if (sigismember(bss, i)) {
155 			newsig = native_to_linux_signo[i];
156 			if (newsig)
157 				linux_sigaddset(lss, newsig);
158 		}
159 	}
160 }
161 
162 void
163 native_to_linux_siginfo(linux_siginfo_t *lsi, const struct _ksiginfo *ksi)
164 {
165 	memset(lsi, 0, sizeof(*lsi));
166 
167 	lsi->lsi_signo = native_to_linux_signo[ksi->_signo];
168 	lsi->lsi_errno = native_to_linux_errno[ksi->_errno];
169 	lsi->lsi_code = native_to_linux_si_code(ksi->_code);
170 
171 	switch (ksi->_code) {
172 	case SI_NOINFO:
173 		break;
174 
175 	case SI_USER:
176 		lsi->lsi_pid = ksi->_reason._rt._pid;
177 		lsi->lsi_uid = ksi->_reason._rt._uid;
178 		if (lsi->lsi_signo == LINUX_SIGALRM ||
179 		    lsi->lsi_signo >= LINUX_SIGRTMIN)
180 			lsi->lsi_value.sival_ptr =
181 			    ksi->_reason._rt._value.sival_ptr;
182 		break;
183 
184 	case SI_TIMER:
185 	case SI_QUEUE:
186 		lsi->lsi_uid = ksi->_reason._rt._uid;
187 		lsi->lsi_uid = ksi->_reason._rt._uid;
188 		lsi->lsi_value.sival_ptr = ksi->_reason._rt._value.sival_ptr;
189 		break;
190 
191 	case SI_ASYNCIO:
192 	case SI_MESGQ:
193 		lsi->lsi_value.sival_ptr = ksi->_reason._rt._value.sival_ptr;
194 		break;
195 
196 	default:
197 		switch (ksi->_signo) {
198 		case SIGCHLD:
199 			lsi->lsi_uid = ksi->_reason._child._uid;
200 			lsi->lsi_pid = ksi->_reason._child._pid;
201 			lsi->lsi_status = native_to_linux_si_status(
202 			    ksi->_code, ksi->_reason._child._status);
203 			lsi->lsi_utime = ksi->_reason._child._utime;
204 			lsi->lsi_stime = ksi->_reason._child._stime;
205 			break;
206 
207 		case SIGILL:
208 		case SIGFPE:
209 		case SIGSEGV:
210 		case SIGBUS:
211 		case SIGTRAP:
212 			lsi->lsi_addr = ksi->_reason._fault._addr;
213 			break;
214 
215 		case SIGIO:
216 			lsi->lsi_fd = ksi->_reason._poll._fd;
217 			lsi->lsi_band = ksi->_reason._poll._band;
218 			break;
219 		default:
220 			break;
221 		}
222 	}
223 }
224 
225 unsigned int
226 native_to_linux_sigflags(const int bsf)
227 {
228 	unsigned int lsf = 0;
229 	if ((bsf & SA_NOCLDSTOP) != 0)
230 		lsf |= LINUX_SA_NOCLDSTOP;
231 	if ((bsf & SA_NOCLDWAIT) != 0)
232 		lsf |= LINUX_SA_NOCLDWAIT;
233 	if ((bsf & SA_ONSTACK) != 0)
234 		lsf |= LINUX_SA_ONSTACK;
235 	if ((bsf & SA_RESTART) != 0)
236 		lsf |= LINUX_SA_RESTART;
237 	if ((bsf & SA_NODEFER) != 0)
238 		lsf |= LINUX_SA_NOMASK;
239 	if ((bsf & SA_RESETHAND) != 0)
240 		lsf |= LINUX_SA_ONESHOT;
241 	if ((bsf & SA_SIGINFO) != 0)
242 		lsf |= LINUX_SA_SIGINFO;
243 	return lsf;
244 }
245 
246 int
247 linux_to_native_sigflags(const unsigned long lsf)
248 {
249 	int bsf = 0;
250 	if ((lsf & LINUX_SA_NOCLDSTOP) != 0)
251 		bsf |= SA_NOCLDSTOP;
252 	if ((lsf & LINUX_SA_NOCLDWAIT) != 0)
253 		bsf |= SA_NOCLDWAIT;
254 	if ((lsf & LINUX_SA_ONSTACK) != 0)
255 		bsf |= SA_ONSTACK;
256 	if ((lsf & LINUX_SA_RESTART) != 0)
257 		bsf |= SA_RESTART;
258 	if ((lsf & LINUX_SA_ONESHOT) != 0)
259 		bsf |= SA_RESETHAND;
260 	if ((lsf & LINUX_SA_NOMASK) != 0)
261 		bsf |= SA_NODEFER;
262 	if ((lsf & LINUX_SA_SIGINFO) != 0)
263 		bsf |= SA_SIGINFO;
264 	if ((lsf & ~LINUX_SA_ALLBITS) != 0) {
265 		DPRINTF(("linux_old_to_native_sigflags: "
266 		    "%lx extra bits ignored\n", lsf));
267 	}
268 	return bsf;
269 }
270 
271 /*
272  * Convert between Linux and BSD sigaction structures.
273  */
274 void
275 linux_old_to_native_sigaction(struct sigaction *bsa, const struct linux_old_sigaction *lsa)
276 {
277 	bsa->sa_handler = lsa->linux_sa_handler;
278 	linux_old_to_native_sigset(&bsa->sa_mask, &lsa->linux_sa_mask);
279 	bsa->sa_flags = linux_to_native_sigflags(lsa->linux_sa_flags);
280 }
281 
282 void
283 native_to_linux_old_sigaction(struct linux_old_sigaction *lsa, const struct sigaction *bsa)
284 {
285 	lsa->linux_sa_handler = bsa->sa_handler;
286 	native_to_linux_old_sigset(&lsa->linux_sa_mask, &bsa->sa_mask);
287 	lsa->linux_sa_flags = native_to_linux_sigflags(bsa->sa_flags);
288 #ifndef __alpha__
289 	lsa->linux_sa_restorer = NULL;
290 #endif
291 }
292 
293 /* ...and the new sigaction conversion funcs. */
294 void
295 linux_to_native_sigaction(struct sigaction *bsa, const struct linux_sigaction *lsa)
296 {
297 	bsa->sa_handler = lsa->linux_sa_handler;
298 	linux_to_native_sigset(&bsa->sa_mask, &lsa->linux_sa_mask);
299 	bsa->sa_flags = linux_to_native_sigflags(lsa->linux_sa_flags);
300 }
301 
302 void
303 native_to_linux_sigaction(struct linux_sigaction *lsa, const struct sigaction *bsa)
304 {
305 	lsa->linux_sa_handler = bsa->sa_handler;
306 	native_to_linux_sigset(&lsa->linux_sa_mask, &bsa->sa_mask);
307 	lsa->linux_sa_flags = native_to_linux_sigflags(bsa->sa_flags);
308 #ifndef __alpha__
309 	lsa->linux_sa_restorer = NULL;
310 #endif
311 }
312 
313 /* ----------------------------------------------------------------------- */
314 
315 /*
316  * The Linux sigaction() system call. Do the usual conversions,
317  * and just call sigaction(). Some flags and values are silently
318  * ignored (see above).
319  */
320 int
321 linux_sys_rt_sigaction(struct lwp *l, const struct linux_sys_rt_sigaction_args *uap, register_t *retval)
322 {
323 	/* {
324 		syscallarg(int) signum;
325 		syscallarg(const struct linux_sigaction *) nsa;
326 		syscallarg(struct linux_sigaction *) osa;
327 		syscallarg(size_t) sigsetsize;
328 	} */
329 	struct linux_sigaction nlsa, olsa;
330 	struct sigaction nbsa, obsa;
331 	int error, sig;
332 	void *tramp = NULL;
333 	int vers = 0;
334 #if defined __amd64__
335 	struct sigacts *ps = l->l_proc->p_sigacts;
336 #endif
337 
338 	if (SCARG(uap, sigsetsize) != sizeof(linux_sigset_t))
339 		return (EINVAL);
340 
341 	if (SCARG(uap, nsa)) {
342 		error = copyin(SCARG(uap, nsa), &nlsa, sizeof(nlsa));
343 		if (error)
344 			return (error);
345 		linux_to_native_sigaction(&nbsa, &nlsa);
346 	}
347 
348 	sig = SCARG(uap, signum);
349 	if (sig < 0 || sig >= LINUX__NSIG)
350 		return (EINVAL);
351 	if (sig > 0 && !linux_to_native_signo[sig]) {
352 		/* Pretend that we did something useful for unknown signals. */
353 		obsa.sa_handler = SIG_IGN;
354 		sigemptyset(&obsa.sa_mask);
355 		obsa.sa_flags = 0;
356 	} else {
357 #if defined __amd64__
358 		if (nlsa.linux_sa_flags & LINUX_SA_RESTORER) {
359 			if ((tramp = nlsa.linux_sa_restorer) != NULL)
360 				vers = 2; /* XXX arch dependent */
361 		}
362 #endif
363 
364 		error = sigaction1(l, linux_to_native_signo[sig],
365 		    SCARG(uap, nsa) ? &nbsa : NULL,
366 		    SCARG(uap, osa) ? &obsa : NULL,
367 		    tramp, vers);
368 		if (error)
369 			return (error);
370 	}
371 	if (SCARG(uap, osa)) {
372 		native_to_linux_sigaction(&olsa, &obsa);
373 
374 #if defined __amd64__
375 		if (ps->sa_sigdesc[sig].sd_vers != 0) {
376 			olsa.linux_sa_restorer = ps->sa_sigdesc[sig].sd_tramp;
377 			olsa.linux_sa_flags |= LINUX_SA_RESTORER;
378 		}
379 #endif
380 
381 		error = copyout(&olsa, SCARG(uap, osa), sizeof(olsa));
382 		if (error)
383 			return (error);
384 	}
385 	return (0);
386 }
387 
388 int
389 linux_sigprocmask1(struct lwp *l, int how, const linux_old_sigset_t *set, linux_old_sigset_t *oset)
390 {
391 	struct proc *p = l->l_proc;
392 	linux_old_sigset_t nlss, olss;
393 	sigset_t nbss, obss;
394 	int error;
395 
396 	switch (how) {
397 	case LINUX_SIG_BLOCK:
398 		how = SIG_BLOCK;
399 		break;
400 	case LINUX_SIG_UNBLOCK:
401 		how = SIG_UNBLOCK;
402 		break;
403 	case LINUX_SIG_SETMASK:
404 		how = SIG_SETMASK;
405 		break;
406 	default:
407 		return (EINVAL);
408 	}
409 
410 	if (set) {
411 		error = copyin(set, &nlss, sizeof(nlss));
412 		if (error)
413 			return (error);
414 		linux_old_to_native_sigset(&nbss, &nlss);
415 	}
416 	mutex_enter(p->p_lock);
417 	error = sigprocmask1(l, how,
418 	    set ? &nbss : NULL, oset ? &obss : NULL);
419 	mutex_exit(p->p_lock);
420 	if (error)
421 		return (error);
422 	if (oset) {
423 		native_to_linux_old_sigset(&olss, &obss);
424 		error = copyout(&olss, oset, sizeof(olss));
425 		if (error)
426 			return (error);
427 	}
428 	return (error);
429 }
430 
431 int
432 linux_sys_rt_sigprocmask(struct lwp *l, const struct linux_sys_rt_sigprocmask_args *uap, register_t *retval)
433 {
434 	/* {
435 		syscallarg(int) how;
436 		syscallarg(const linux_sigset_t *) set;
437 		syscallarg(linux_sigset_t *) oset;
438 		syscallarg(size_t) sigsetsize;
439 	} */
440 	linux_sigset_t nlss, olss, *oset;
441 	const linux_sigset_t *set;
442 	struct proc *p = l->l_proc;
443 	sigset_t nbss, obss;
444 	int error, how;
445 
446 	if (SCARG(uap, sigsetsize) != sizeof(linux_sigset_t))
447 		return (EINVAL);
448 
449 	switch (SCARG(uap, how)) {
450 	case LINUX_SIG_BLOCK:
451 		how = SIG_BLOCK;
452 		break;
453 	case LINUX_SIG_UNBLOCK:
454 		how = SIG_UNBLOCK;
455 		break;
456 	case LINUX_SIG_SETMASK:
457 		how = SIG_SETMASK;
458 		break;
459 	default:
460 		return (EINVAL);
461 	}
462 
463 	set = SCARG(uap, set);
464 	oset = SCARG(uap, oset);
465 
466 	if (set) {
467 		error = copyin(set, &nlss, sizeof(nlss));
468 		if (error)
469 			return (error);
470 		linux_to_native_sigset(&nbss, &nlss);
471 	}
472 	mutex_enter(p->p_lock);
473 	error = sigprocmask1(l, how,
474 	    set ? &nbss : NULL, oset ? &obss : NULL);
475 	mutex_exit(p->p_lock);
476 	if (!error && oset) {
477 		native_to_linux_sigset(&olss, &obss);
478 		error = copyout(&olss, oset, sizeof(olss));
479 	}
480 	return (error);
481 }
482 
483 int
484 linux_sys_rt_sigpending(struct lwp *l, const struct linux_sys_rt_sigpending_args *uap, register_t *retval)
485 {
486 	/* {
487 		syscallarg(linux_sigset_t *) set;
488 		syscallarg(size_t) sigsetsize;
489 	} */
490 	sigset_t bss;
491 	linux_sigset_t lss;
492 
493 	if (SCARG(uap, sigsetsize) != sizeof(linux_sigset_t))
494 		return (EINVAL);
495 
496 	sigpending1(l, &bss);
497 	native_to_linux_sigset(&lss, &bss);
498 	return copyout(&lss, SCARG(uap, set), sizeof(lss));
499 }
500 
501 #ifndef __amd64__
502 int
503 linux_sys_sigpending(struct lwp *l, const struct linux_sys_sigpending_args *uap, register_t *retval)
504 {
505 	/* {
506 		syscallarg(linux_old_sigset_t *) mask;
507 	} */
508 	sigset_t bss;
509 	linux_old_sigset_t lss;
510 
511 	sigpending1(l, &bss);
512 	native_to_linux_old_sigset(&lss, &bss);
513 	return copyout(&lss, SCARG(uap, set), sizeof(lss));
514 }
515 
516 int
517 linux_sys_sigsuspend(struct lwp *l, const struct linux_sys_sigsuspend_args *uap, register_t *retval)
518 {
519 	/* {
520 		syscallarg(void *) restart;
521 		syscallarg(int) oldmask;
522 		syscallarg(int) mask;
523 	} */
524 	linux_old_sigset_t lss;
525 	sigset_t bss;
526 
527 	lss = SCARG(uap, mask);
528 	linux_old_to_native_sigset(&bss, &lss);
529 	return (sigsuspend1(l, &bss));
530 }
531 #endif /* __amd64__ */
532 
533 int
534 linux_sys_rt_sigsuspend(struct lwp *l, const struct linux_sys_rt_sigsuspend_args *uap, register_t *retval)
535 {
536 	/* {
537 		syscallarg(linux_sigset_t *) unewset;
538 		syscallarg(size_t) sigsetsize;
539 	} */
540 	linux_sigset_t lss;
541 	sigset_t bss;
542 	int error;
543 
544 	if (SCARG(uap, sigsetsize) != sizeof(linux_sigset_t))
545 		return (EINVAL);
546 
547 	error = copyin(SCARG(uap, unewset), &lss, sizeof(linux_sigset_t));
548 	if (error)
549 		return (error);
550 
551 	linux_to_native_sigset(&bss, &lss);
552 
553 	return (sigsuspend1(l, &bss));
554 }
555 
556 static int
557 fetchss(const void *u, void *s, size_t len)
558 {
559 	int error;
560 	linux_sigset_t lss;
561 
562 	if ((error = copyin(u, &lss, sizeof(lss))) != 0)
563 		return error;
564 
565 	linux_to_native_sigset(s, &lss);
566 	return 0;
567 }
568 
569 static int
570 fetchts(const void *u, void *s, size_t len)
571 {
572 	int error;
573 	struct linux_timespec lts;
574 
575 	if ((error = copyin(u, &lts, sizeof(lts))) != 0)
576 		return error;
577 
578 	linux_to_native_timespec(s, &lts);
579 	return 0;
580 }
581 
582 static int
583 fakestorets(const void *u, void *s, size_t len)
584 {
585 	/* Do nothing, sigtimedwait does not alter timeout like ours */
586 	return 0;
587 }
588 
589 static int
590 storeinfo(const void *s, void *u, size_t len)
591 {
592 	struct linux_siginfo lsi;
593 
594 	native_to_linux_siginfo(&lsi, &((const siginfo_t *)s)->_info);
595 	return copyout(&lsi, u, sizeof(lsi));
596 }
597 
598 int
599 linux_sys_rt_sigtimedwait(struct lwp *l,
600     const struct linux_sys_rt_sigtimedwait_args *uap, register_t *retval)
601 {
602 	/* {
603 		syscallarg(const linux_sigset_t *) set;
604 		syscallarg(linux_siginfo_t *) info);
605 		syscallarg(const struct linux_timespec *) timeout;
606 	} */
607 
608 	return sigtimedwait1(l, (const struct sys_____sigtimedwait50_args *)uap,
609 	    retval, fetchss, storeinfo, fetchts, fakestorets);
610 }
611 
612 /*
613  * Once more: only a signal conversion is needed.
614  * Note: also used as sys_rt_queueinfo.  The info field is ignored.
615  */
616 int
617 linux_sys_rt_queueinfo(struct lwp *l, const struct linux_sys_rt_queueinfo_args *uap, register_t *retval)
618 {
619 	/*
620 		syscallarg(int) pid;
621 		syscallarg(int) signum;
622 		syscallarg(linix_siginfo_t *) uinfo;
623 	*/
624 	int error;
625 	linux_siginfo_t info;
626 
627 	error = copyin(SCARG(uap, uinfo), &info, sizeof(info));
628 	if (error)
629 		return error;
630 	if (info.lsi_code >= 0)
631 		return EPERM;
632 
633 	/* XXX To really implement this we need to	*/
634 	/* XXX keep a list of queued signals somewhere.	*/
635 	return (linux_sys_kill(l, (const void *)uap, retval));
636 }
637 
638 int
639 linux_sys_kill(struct lwp *l, const struct linux_sys_kill_args *uap, register_t *retval)
640 {
641 	/* {
642 		syscallarg(int) pid;
643 		syscallarg(int) signum;
644 	} */
645 
646 	struct sys_kill_args ka;
647 	int sig;
648 
649 	SCARG(&ka, pid) = SCARG(uap, pid);
650 	sig = SCARG(uap, signum);
651 	if (sig < 0 || sig >= LINUX__NSIG)
652 		return (EINVAL);
653 	SCARG(&ka, signum) = linux_to_native_signo[sig];
654 	return sys_kill(l, &ka, retval);
655 }
656 
657 #ifdef LINUX_SS_ONSTACK
658 static void linux_to_native_sigaltstack(struct sigaltstack *,
659     const struct linux_sigaltstack *);
660 
661 static void
662 linux_to_native_sigaltstack(struct sigaltstack *bss, const struct linux_sigaltstack *lss)
663 {
664 	bss->ss_sp = lss->ss_sp;
665 	bss->ss_size = lss->ss_size;
666 	if (lss->ss_flags & LINUX_SS_ONSTACK)
667 	    bss->ss_flags = SS_ONSTACK;
668 	else if (lss->ss_flags & LINUX_SS_DISABLE)
669 	    bss->ss_flags = SS_DISABLE;
670 	else
671 	    bss->ss_flags = 0;
672 }
673 
674 void
675 native_to_linux_sigaltstack(struct linux_sigaltstack *lss, const struct sigaltstack *bss)
676 {
677 	lss->ss_sp = bss->ss_sp;
678 	lss->ss_size = bss->ss_size;
679 	if (bss->ss_flags & SS_ONSTACK)
680 	    lss->ss_flags = LINUX_SS_ONSTACK;
681 	else if (bss->ss_flags & SS_DISABLE)
682 	    lss->ss_flags = LINUX_SS_DISABLE;
683 	else
684 	    lss->ss_flags = 0;
685 }
686 
687 int
688 linux_sys_sigaltstack(struct lwp *l, const struct linux_sys_sigaltstack_args *uap, register_t *retval)
689 {
690 	/* {
691 		syscallarg(const struct linux_sigaltstack *) ss;
692 		syscallarg(struct linux_sigaltstack *) oss;
693 	} */
694 	struct linux_sigaltstack ss;
695 	struct sigaltstack nss;
696 	struct proc *p = l->l_proc;
697 	int error = 0;
698 
699 	if (SCARG(uap, oss)) {
700 		native_to_linux_sigaltstack(&ss, &l->l_sigstk);
701 		if ((error = copyout(&ss, SCARG(uap, oss), sizeof(ss))) != 0)
702 			return error;
703 	}
704 
705 	if (SCARG(uap, ss) != NULL) {
706 		if ((error = copyin(SCARG(uap, ss), &ss, sizeof(ss))) != 0)
707 			return error;
708 		linux_to_native_sigaltstack(&nss, &ss);
709 
710 		mutex_enter(p->p_lock);
711 
712 		if (nss.ss_flags & ~SS_ALLBITS)
713 			error = EINVAL;
714 		else if (nss.ss_flags & SS_DISABLE) {
715 			if (l->l_sigstk.ss_flags & SS_ONSTACK)
716 				error = EINVAL;
717 		} else if (nss.ss_size < LINUX_MINSIGSTKSZ)
718 			error = ENOMEM;
719 
720 		if (error == 0)
721 			l->l_sigstk = nss;
722 
723 		mutex_exit(p->p_lock);
724 	}
725 
726 	return error;
727 }
728 #endif /* LINUX_SS_ONSTACK */
729 
730 static int
731 linux_do_tkill(struct lwp *l, int tgid, int tid, int signum)
732 {
733 	struct proc *p;
734 	struct lwp *t;
735 	ksiginfo_t ksi;
736 	int error;
737 
738 	if (signum < 0 || signum >= LINUX__NSIG)
739 		return EINVAL;
740 	signum = linux_to_native_signo[signum];
741 
742 	if (tgid == -1) {
743 		tgid = tid;
744 	}
745 
746 	KSI_INIT(&ksi);
747 	ksi.ksi_signo = signum;
748 	ksi.ksi_code = SI_LWP;
749 	ksi.ksi_pid = l->l_proc->p_pid;
750 	ksi.ksi_uid = kauth_cred_geteuid(l->l_cred);
751 	ksi.ksi_lid = tid;
752 
753 	mutex_enter(proc_lock);
754 	p = proc_find(tgid);
755 	if (p == NULL) {
756 		mutex_exit(proc_lock);
757 		return ESRCH;
758 	}
759 	mutex_enter(p->p_lock);
760 	error = kauth_authorize_process(l->l_cred,
761 	    KAUTH_PROCESS_SIGNAL, p, KAUTH_ARG(signum), NULL, NULL);
762 	if ((t = lwp_find(p, ksi.ksi_lid)) == NULL)
763 		error = ESRCH;
764 	else if (signum != 0)
765 		kpsignal2(p, &ksi);
766 	mutex_exit(p->p_lock);
767 	mutex_exit(proc_lock);
768 
769 	return error;
770 }
771 
772 int
773 linux_sys_tkill(struct lwp *l, const struct linux_sys_tkill_args *uap, register_t *retval)
774 {
775 	/* {
776 		syscallarg(int) tid;
777 		syscallarg(int) sig;
778 	} */
779 
780 	if (SCARG(uap, tid) <= 0)
781 		return EINVAL;
782 
783 	return linux_do_tkill(l, -1, SCARG(uap, tid), SCARG(uap, sig));
784 }
785 
786 int
787 linux_sys_tgkill(struct lwp *l, const struct linux_sys_tgkill_args *uap, register_t *retval)
788 {
789 	/* {
790 		syscallarg(int) tgid;
791 		syscallarg(int) tid;
792 		syscallarg(int) sig;
793 	} */
794 
795 	if (SCARG(uap, tid) <= 0 || SCARG(uap, tgid) < -1)
796 		return EINVAL;
797 
798 	return linux_do_tkill(l, SCARG(uap, tgid), SCARG(uap, tid), SCARG(uap, sig));
799 }
800 
801 int
802 native_to_linux_si_code(int code)
803 {
804 	int si_codes[] = {
805 	    LINUX_SI_USER, LINUX_SI_QUEUE, LINUX_SI_TIMER, LINUX_SI_ASYNCIO,
806 	    LINUX_SI_MESGQ, LINUX_SI_TKILL /* SI_LWP */
807 	};
808 
809 	if (code <= 0 && -code < __arraycount(si_codes))
810 		return si_codes[-code];
811 
812 	return code;
813 }
814 
815 int
816 native_to_linux_si_status(int code, int status)
817 {
818 	int sts;
819 
820 	switch (code) {
821 	case CLD_CONTINUED:
822 		sts = LINUX_SIGCONT;
823 		break;
824 	case CLD_EXITED:
825 		sts = WEXITSTATUS(status);
826 		break;
827 	case CLD_STOPPED:
828 	case CLD_TRAPPED:
829 	case CLD_DUMPED:
830 	case CLD_KILLED:
831 	default:
832 		sts = native_to_linux_signo[WTERMSIG(status)];
833 		break;
834 	}
835 
836 	return sts;
837 }
838