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 "opt_ktrace.h"
30
31 #include <sys/param.h>
32 #include <sys/ktr.h>
33 #include <sys/lock.h>
34 #include <sys/mutex.h>
35 #include <sys/proc.h>
36 #include <sys/signalvar.h>
37 #include <sys/sx.h>
38 #include <sys/syscallsubr.h>
39 #include <sys/sysproto.h>
40 #ifdef KTRACE
41 #include <sys/ktrace.h>
42 #endif
43
44 #include <security/audit/audit.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_time.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_pksignal(struct thread *td, int pid, int sig,
61 ksiginfo_t *ksi);
62 static int linux_psignal(struct thread *td, int pid, int sig);
63 static int linux_tdksignal(struct thread *td, lwpid_t tid,
64 int tgid, int sig, ksiginfo_t *ksi);
65 static int linux_tdsignal(struct thread *td, lwpid_t tid,
66 int tgid, int sig);
67 static void sicode_to_lsicode(int sig, int si_code, int *lsi_code);
68 static int linux_common_rt_sigtimedwait(struct thread *,
69 l_sigset_t *, struct timespec *, l_siginfo_t *,
70 l_size_t);
71
72 static void
linux_to_bsd_sigaction(l_sigaction_t * lsa,struct sigaction * bsa)73 linux_to_bsd_sigaction(l_sigaction_t *lsa, struct sigaction *bsa)
74 {
75 unsigned long flags;
76
77 linux_to_bsd_sigset(&lsa->lsa_mask, &bsa->sa_mask);
78 bsa->sa_handler = PTRIN(lsa->lsa_handler);
79 bsa->sa_flags = 0;
80
81 flags = lsa->lsa_flags;
82 if (lsa->lsa_flags & LINUX_SA_NOCLDSTOP) {
83 flags &= ~LINUX_SA_NOCLDSTOP;
84 bsa->sa_flags |= SA_NOCLDSTOP;
85 }
86 if (lsa->lsa_flags & LINUX_SA_NOCLDWAIT) {
87 flags &= ~LINUX_SA_NOCLDWAIT;
88 bsa->sa_flags |= SA_NOCLDWAIT;
89 }
90 if (lsa->lsa_flags & LINUX_SA_SIGINFO) {
91 flags &= ~LINUX_SA_SIGINFO;
92 bsa->sa_flags |= SA_SIGINFO;
93 #ifdef notyet
94 /*
95 * XXX: We seem to be missing code to convert
96 * some of the fields in ucontext_t.
97 */
98 linux_msg(curthread,
99 "partially unsupported sigaction flag SA_SIGINFO");
100 #endif
101 }
102 if (lsa->lsa_flags & LINUX_SA_RESTORER) {
103 flags &= ~LINUX_SA_RESTORER;
104 /*
105 * We ignore the lsa_restorer and always use our own signal
106 * trampoline instead. It looks like SA_RESTORER is obsolete
107 * in Linux too - it doesn't seem to be used at all on arm64.
108 * In any case: see Linux sigreturn(2).
109 */
110 }
111 if (lsa->lsa_flags & LINUX_SA_ONSTACK) {
112 flags &= ~LINUX_SA_ONSTACK;
113 bsa->sa_flags |= SA_ONSTACK;
114 }
115 if (lsa->lsa_flags & LINUX_SA_RESTART) {
116 flags &= ~LINUX_SA_RESTART;
117 bsa->sa_flags |= SA_RESTART;
118 }
119 if (lsa->lsa_flags & LINUX_SA_INTERRUPT) {
120 flags &= ~LINUX_SA_INTERRUPT;
121 /* Documented to be a "historical no-op". */
122 }
123 if (lsa->lsa_flags & LINUX_SA_ONESHOT) {
124 flags &= ~LINUX_SA_ONESHOT;
125 bsa->sa_flags |= SA_RESETHAND;
126 }
127 if (lsa->lsa_flags & LINUX_SA_NOMASK) {
128 flags &= ~LINUX_SA_NOMASK;
129 bsa->sa_flags |= SA_NODEFER;
130 }
131
132 /*
133 * SA_UNSUPPORTED was introduced in Linux 5.11 to probe support for
134 * other flags such as SA_EXPOSE_TAGBITS, introduced at the same time.
135 * Ignore both.
136 */
137 if (lsa->lsa_flags & (LINUX_SA_UNSUPPORTED | LINUX_SA_EXPOSE_TAGBITS))
138 flags &= ~(LINUX_SA_UNSUPPORTED | LINUX_SA_EXPOSE_TAGBITS);
139
140 if (flags != 0)
141 linux_msg(curthread, "unsupported sigaction flag %#lx", flags);
142 }
143
144 static void
bsd_to_linux_sigaction(struct sigaction * bsa,l_sigaction_t * lsa)145 bsd_to_linux_sigaction(struct sigaction *bsa, l_sigaction_t *lsa)
146 {
147
148 bsd_to_linux_sigset(&bsa->sa_mask, &lsa->lsa_mask);
149 #ifdef COMPAT_LINUX32
150 lsa->lsa_handler = (uintptr_t)bsa->sa_handler;
151 #else
152 lsa->lsa_handler = bsa->sa_handler;
153 #endif
154 lsa->lsa_restorer = 0; /* unsupported */
155 lsa->lsa_flags = 0;
156 if (bsa->sa_flags & SA_NOCLDSTOP)
157 lsa->lsa_flags |= LINUX_SA_NOCLDSTOP;
158 if (bsa->sa_flags & SA_NOCLDWAIT)
159 lsa->lsa_flags |= LINUX_SA_NOCLDWAIT;
160 if (bsa->sa_flags & SA_SIGINFO)
161 lsa->lsa_flags |= LINUX_SA_SIGINFO;
162 if (bsa->sa_flags & SA_ONSTACK)
163 lsa->lsa_flags |= LINUX_SA_ONSTACK;
164 if (bsa->sa_flags & SA_RESTART)
165 lsa->lsa_flags |= LINUX_SA_RESTART;
166 if (bsa->sa_flags & SA_RESETHAND)
167 lsa->lsa_flags |= LINUX_SA_ONESHOT;
168 if (bsa->sa_flags & SA_NODEFER)
169 lsa->lsa_flags |= LINUX_SA_NOMASK;
170 }
171
172 int
linux_do_sigaction(struct thread * td,int linux_sig,l_sigaction_t * linux_nsa,l_sigaction_t * linux_osa)173 linux_do_sigaction(struct thread *td, int linux_sig, l_sigaction_t *linux_nsa,
174 l_sigaction_t *linux_osa)
175 {
176 struct sigaction act, oact, *nsa, *osa;
177 int error, sig;
178
179 if (!LINUX_SIG_VALID(linux_sig))
180 return (EINVAL);
181 sig = linux_to_bsd_signal(linux_sig);
182
183 osa = (linux_osa != NULL) ? &oact : NULL;
184 if (linux_nsa != NULL) {
185 nsa = &act;
186 linux_to_bsd_sigaction(linux_nsa, nsa);
187 #ifdef KTRACE
188 if (KTRPOINT(td, KTR_STRUCT))
189 linux_ktrsigset(&linux_nsa->lsa_mask,
190 sizeof(linux_nsa->lsa_mask));
191 #endif
192 if ((sig == SIGKILL || sig == SIGSTOP) &&
193 nsa->sa_handler == SIG_DFL)
194 return (EINVAL);
195 } else
196 nsa = NULL;
197
198 error = kern_sigaction(td, sig, nsa, osa, 0);
199 if (error != 0)
200 return (error);
201
202 if (linux_osa != NULL) {
203 bsd_to_linux_sigaction(osa, linux_osa);
204 #ifdef KTRACE
205 if (KTRPOINT(td, KTR_STRUCT))
206 linux_ktrsigset(&linux_osa->lsa_mask,
207 sizeof(linux_osa->lsa_mask));
208 #endif
209 }
210 return (0);
211 }
212
213 int
linux_sigaltstack(struct thread * td,struct linux_sigaltstack_args * uap)214 linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap)
215 {
216 stack_t ss, oss;
217 l_stack_t lss;
218 int error;
219
220 memset(&lss, 0, sizeof(lss));
221 LINUX_CTR2(sigaltstack, "%p, %p", uap->uss, uap->uoss);
222
223 if (uap->uss != NULL) {
224 error = copyin(uap->uss, &lss, sizeof(lss));
225 if (error != 0)
226 return (error);
227
228 ss.ss_sp = PTRIN(lss.ss_sp);
229 ss.ss_size = lss.ss_size;
230 ss.ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags);
231 }
232 error = kern_sigaltstack(td, (uap->uss != NULL) ? &ss : NULL,
233 (uap->uoss != NULL) ? &oss : NULL);
234 if (error == 0 && uap->uoss != NULL) {
235 lss.ss_sp = PTROUT(oss.ss_sp);
236 lss.ss_size = oss.ss_size;
237 lss.ss_flags = bsd_to_linux_sigaltstack(oss.ss_flags);
238 error = copyout(&lss, uap->uoss, sizeof(lss));
239 }
240
241 return (error);
242 }
243
244 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
245 int
linux_signal(struct thread * td,struct linux_signal_args * args)246 linux_signal(struct thread *td, struct linux_signal_args *args)
247 {
248 l_sigaction_t nsa, osa;
249 int error;
250
251 nsa.lsa_handler = args->handler;
252 nsa.lsa_flags = LINUX_SA_ONESHOT | LINUX_SA_NOMASK;
253 LINUX_SIGEMPTYSET(nsa.lsa_mask);
254
255 error = linux_do_sigaction(td, args->sig, &nsa, &osa);
256 td->td_retval[0] = (int)(intptr_t)osa.lsa_handler;
257
258 return (error);
259 }
260 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
261
262 int
linux_rt_sigaction(struct thread * td,struct linux_rt_sigaction_args * args)263 linux_rt_sigaction(struct thread *td, struct linux_rt_sigaction_args *args)
264 {
265 l_sigaction_t nsa, osa;
266 int error;
267
268 if (args->sigsetsize != sizeof(l_sigset_t))
269 return (EINVAL);
270
271 if (args->act != NULL) {
272 error = copyin(args->act, &nsa, sizeof(nsa));
273 if (error != 0)
274 return (error);
275 }
276
277 error = linux_do_sigaction(td, args->sig,
278 args->act ? &nsa : NULL,
279 args->oact ? &osa : NULL);
280
281 if (args->oact != NULL && error == 0)
282 error = copyout(&osa, args->oact, sizeof(osa));
283
284 return (error);
285 }
286
287 static int
linux_do_sigprocmask(struct thread * td,int how,sigset_t * new,l_sigset_t * old)288 linux_do_sigprocmask(struct thread *td, int how, sigset_t *new,
289 l_sigset_t *old)
290 {
291 sigset_t omask;
292 int error;
293
294 td->td_retval[0] = 0;
295
296 switch (how) {
297 case LINUX_SIG_BLOCK:
298 how = SIG_BLOCK;
299 break;
300 case LINUX_SIG_UNBLOCK:
301 how = SIG_UNBLOCK;
302 break;
303 case LINUX_SIG_SETMASK:
304 how = SIG_SETMASK;
305 break;
306 default:
307 return (EINVAL);
308 }
309 error = kern_sigprocmask(td, how, new, &omask, 0);
310 if (error == 0 && old != NULL)
311 bsd_to_linux_sigset(&omask, old);
312
313 return (error);
314 }
315
316 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
317 int
linux_sigprocmask(struct thread * td,struct linux_sigprocmask_args * args)318 linux_sigprocmask(struct thread *td, struct linux_sigprocmask_args *args)
319 {
320 l_osigset_t mask;
321 l_sigset_t lset, oset;
322 sigset_t set;
323 int error;
324
325 if (args->mask != NULL) {
326 error = copyin(args->mask, &mask, sizeof(mask));
327 if (error != 0)
328 return (error);
329 LINUX_SIGEMPTYSET(lset);
330 lset.__mask = mask;
331 #ifdef KTRACE
332 if (KTRPOINT(td, KTR_STRUCT))
333 linux_ktrsigset(&lset, sizeof(lset));
334 #endif
335 linux_to_bsd_sigset(&lset, &set);
336 }
337
338 error = linux_do_sigprocmask(td, args->how,
339 args->mask ? &set : NULL,
340 args->omask ? &oset : NULL);
341
342 if (args->omask != NULL && error == 0) {
343 #ifdef KTRACE
344 if (KTRPOINT(td, KTR_STRUCT))
345 linux_ktrsigset(&oset, sizeof(oset));
346 #endif
347 mask = oset.__mask;
348 error = copyout(&mask, args->omask, sizeof(mask));
349 }
350
351 return (error);
352 }
353 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
354
355 int
linux_rt_sigprocmask(struct thread * td,struct linux_rt_sigprocmask_args * args)356 linux_rt_sigprocmask(struct thread *td, struct linux_rt_sigprocmask_args *args)
357 {
358 l_sigset_t oset;
359 sigset_t set, *pset;
360 int error;
361
362 error = linux_copyin_sigset(td, args->mask, args->sigsetsize,
363 &set, &pset);
364 if (error != 0)
365 return (EINVAL);
366
367 error = linux_do_sigprocmask(td, args->how, pset,
368 args->omask ? &oset : NULL);
369
370 if (args->omask != NULL && error == 0) {
371 #ifdef KTRACE
372 if (KTRPOINT(td, KTR_STRUCT))
373 linux_ktrsigset(&oset, sizeof(oset));
374 #endif
375 error = copyout(&oset, args->omask, sizeof(oset));
376 }
377
378 return (error);
379 }
380
381 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
382 int
linux_sgetmask(struct thread * td,struct linux_sgetmask_args * args)383 linux_sgetmask(struct thread *td, struct linux_sgetmask_args *args)
384 {
385 struct proc *p = td->td_proc;
386 l_sigset_t mask;
387
388 PROC_LOCK(p);
389 bsd_to_linux_sigset(&td->td_sigmask, &mask);
390 PROC_UNLOCK(p);
391 td->td_retval[0] = mask.__mask;
392 #ifdef KTRACE
393 if (KTRPOINT(td, KTR_STRUCT))
394 linux_ktrsigset(&mask, sizeof(mask));
395 #endif
396 return (0);
397 }
398
399 int
linux_ssetmask(struct thread * td,struct linux_ssetmask_args * args)400 linux_ssetmask(struct thread *td, struct linux_ssetmask_args *args)
401 {
402 struct proc *p = td->td_proc;
403 l_sigset_t lset;
404 sigset_t bset;
405
406 PROC_LOCK(p);
407 bsd_to_linux_sigset(&td->td_sigmask, &lset);
408 td->td_retval[0] = lset.__mask;
409 LINUX_SIGEMPTYSET(lset);
410 lset.__mask = args->mask;
411 linux_to_bsd_sigset(&lset, &bset);
412 #ifdef KTRACE
413 if (KTRPOINT(td, KTR_STRUCT))
414 linux_ktrsigset(&lset, sizeof(lset));
415 #endif
416 td->td_sigmask = bset;
417 SIG_CANTMASK(td->td_sigmask);
418 signotify(td);
419 PROC_UNLOCK(p);
420 return (0);
421 }
422
423 int
linux_sigpending(struct thread * td,struct linux_sigpending_args * args)424 linux_sigpending(struct thread *td, struct linux_sigpending_args *args)
425 {
426 struct proc *p = td->td_proc;
427 sigset_t bset;
428 l_sigset_t lset;
429 l_osigset_t mask;
430
431 PROC_LOCK(p);
432 bset = p->p_siglist;
433 SIGSETOR(bset, td->td_siglist);
434 SIGSETAND(bset, td->td_sigmask);
435 PROC_UNLOCK(p);
436 bsd_to_linux_sigset(&bset, &lset);
437 #ifdef KTRACE
438 if (KTRPOINT(td, KTR_STRUCT))
439 linux_ktrsigset(&lset, sizeof(lset));
440 #endif
441 mask = lset.__mask;
442 return (copyout(&mask, args->mask, sizeof(mask)));
443 }
444 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
445
446 /*
447 * MPSAFE
448 */
449 int
linux_rt_sigpending(struct thread * td,struct linux_rt_sigpending_args * args)450 linux_rt_sigpending(struct thread *td, struct linux_rt_sigpending_args *args)
451 {
452 struct proc *p = td->td_proc;
453 sigset_t bset;
454 l_sigset_t lset;
455
456 if (args->sigsetsize > sizeof(lset))
457 return (EINVAL);
458 /* NOT REACHED */
459
460 PROC_LOCK(p);
461 bset = p->p_siglist;
462 SIGSETOR(bset, td->td_siglist);
463 SIGSETAND(bset, td->td_sigmask);
464 PROC_UNLOCK(p);
465 bsd_to_linux_sigset(&bset, &lset);
466 #ifdef KTRACE
467 if (KTRPOINT(td, KTR_STRUCT))
468 linux_ktrsigset(&lset, sizeof(lset));
469 #endif
470 return (copyout(&lset, args->set, args->sigsetsize));
471 }
472
473 int
linux_rt_sigtimedwait(struct thread * td,struct linux_rt_sigtimedwait_args * args)474 linux_rt_sigtimedwait(struct thread *td,
475 struct linux_rt_sigtimedwait_args *args)
476 {
477 struct timespec ts, *tsa;
478 int error;
479
480 if (args->timeout) {
481 error = linux_get_timespec(&ts, args->timeout);
482 if (error != 0)
483 return (error);
484 tsa = &ts;
485 } else
486 tsa = NULL;
487
488 return (linux_common_rt_sigtimedwait(td, args->mask, tsa,
489 args->ptr, args->sigsetsize));
490 }
491
492 static int
linux_common_rt_sigtimedwait(struct thread * td,l_sigset_t * mask,struct timespec * tsa,l_siginfo_t * ptr,l_size_t sigsetsize)493 linux_common_rt_sigtimedwait(struct thread *td, l_sigset_t *mask,
494 struct timespec *tsa, l_siginfo_t *ptr, l_size_t sigsetsize)
495 {
496 int error, sig;
497 sigset_t bset;
498 l_siginfo_t lsi;
499 ksiginfo_t ksi;
500
501 error = linux_copyin_sigset(td, mask, sigsetsize, &bset, NULL);
502 if (error != 0)
503 return (error);
504
505 ksiginfo_init(&ksi);
506 error = kern_sigtimedwait(td, bset, &ksi, tsa);
507 if (error != 0)
508 return (error);
509
510 sig = bsd_to_linux_signal(ksi.ksi_signo);
511
512 if (ptr) {
513 memset(&lsi, 0, sizeof(lsi));
514 siginfo_to_lsiginfo(&ksi.ksi_info, &lsi, sig);
515 error = copyout(&lsi, ptr, sizeof(lsi));
516 }
517 if (error == 0)
518 td->td_retval[0] = sig;
519
520 return (error);
521 }
522
523 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
524 int
linux_rt_sigtimedwait_time64(struct thread * td,struct linux_rt_sigtimedwait_time64_args * args)525 linux_rt_sigtimedwait_time64(struct thread *td,
526 struct linux_rt_sigtimedwait_time64_args *args)
527 {
528 struct timespec ts, *tsa;
529 int error;
530
531 if (args->timeout) {
532 error = linux_get_timespec64(&ts, args->timeout);
533 if (error != 0)
534 return (error);
535 tsa = &ts;
536 } else
537 tsa = NULL;
538
539 return (linux_common_rt_sigtimedwait(td, args->mask, tsa,
540 args->ptr, args->sigsetsize));
541 }
542 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
543
544 int
linux_kill(struct thread * td,struct linux_kill_args * args)545 linux_kill(struct thread *td, struct linux_kill_args *args)
546 {
547 int sig;
548
549 /*
550 * Allow signal 0 as a means to check for privileges
551 */
552 if (!LINUX_SIG_VALID(args->signum) && args->signum != 0)
553 return (EINVAL);
554
555 if (args->signum > 0)
556 sig = linux_to_bsd_signal(args->signum);
557 else
558 sig = 0;
559
560 if (args->pid > PID_MAX)
561 return (linux_psignal(td, args->pid, sig));
562 else
563 return (kern_kill(td, args->pid, sig));
564 }
565
566 int
linux_tgkill(struct thread * td,struct linux_tgkill_args * args)567 linux_tgkill(struct thread *td, struct linux_tgkill_args *args)
568 {
569 int sig;
570
571 if (args->pid <= 0 || args->tgid <=0)
572 return (EINVAL);
573
574 /*
575 * Allow signal 0 as a means to check for privileges
576 */
577 if (!LINUX_SIG_VALID(args->sig) && args->sig != 0)
578 return (EINVAL);
579
580 if (args->sig > 0)
581 sig = linux_to_bsd_signal(args->sig);
582 else
583 sig = 0;
584
585 return (linux_tdsignal(td, args->pid, args->tgid, sig));
586 }
587
588 /*
589 * Deprecated since 2.5.75. Replaced by tgkill().
590 */
591 int
linux_tkill(struct thread * td,struct linux_tkill_args * args)592 linux_tkill(struct thread *td, struct linux_tkill_args *args)
593 {
594 int sig;
595
596 if (args->tid <= 0)
597 return (EINVAL);
598
599 if (!LINUX_SIG_VALID(args->sig))
600 return (EINVAL);
601
602 sig = linux_to_bsd_signal(args->sig);
603
604 return (linux_tdsignal(td, args->tid, -1, sig));
605 }
606
607 static int
sigfpe_sicode2lsicode(int si_code)608 sigfpe_sicode2lsicode(int si_code)
609 {
610
611 switch (si_code) {
612 case FPE_INTOVF:
613 return (LINUX_FPE_INTOVF);
614 case FPE_INTDIV:
615 return (LINUX_FPE_INTDIV);
616 case FPE_FLTIDO:
617 return (LINUX_FPE_FLTUNK);
618 default:
619 return (si_code);
620 }
621 }
622
623 static int
sigbus_sicode2lsicode(int si_code)624 sigbus_sicode2lsicode(int si_code)
625 {
626
627 switch (si_code) {
628 case BUS_OOMERR:
629 return (LINUX_BUS_MCEERR_AR);
630 default:
631 return (si_code);
632 }
633 }
634
635 static int
sigsegv_sicode2lsicode(int si_code)636 sigsegv_sicode2lsicode(int si_code)
637 {
638
639 switch (si_code) {
640 case SEGV_PKUERR:
641 return (LINUX_SEGV_PKUERR);
642 default:
643 return (si_code);
644 }
645 }
646
647 static int
sigtrap_sicode2lsicode(int si_code)648 sigtrap_sicode2lsicode(int si_code)
649 {
650
651 switch (si_code) {
652 case TRAP_DTRACE:
653 return (LINUX_TRAP_TRACE);
654 case TRAP_CAP:
655 return (LINUX_TRAP_UNK);
656 default:
657 return (si_code);
658 }
659 }
660
661 static void
sicode_to_lsicode(int sig,int si_code,int * lsi_code)662 sicode_to_lsicode(int sig, int si_code, int *lsi_code)
663 {
664
665 switch (si_code) {
666 case SI_USER:
667 *lsi_code = LINUX_SI_USER;
668 break;
669 case SI_KERNEL:
670 *lsi_code = LINUX_SI_KERNEL;
671 break;
672 case SI_QUEUE:
673 *lsi_code = LINUX_SI_QUEUE;
674 break;
675 case SI_TIMER:
676 *lsi_code = LINUX_SI_TIMER;
677 break;
678 case SI_MESGQ:
679 *lsi_code = LINUX_SI_MESGQ;
680 break;
681 case SI_ASYNCIO:
682 *lsi_code = LINUX_SI_ASYNCIO;
683 break;
684 case SI_LWP:
685 *lsi_code = LINUX_SI_TKILL;
686 break;
687 default:
688 switch (sig) {
689 case LINUX_SIGFPE:
690 *lsi_code = sigfpe_sicode2lsicode(si_code);
691 break;
692 case LINUX_SIGBUS:
693 *lsi_code = sigbus_sicode2lsicode(si_code);
694 break;
695 case LINUX_SIGSEGV:
696 *lsi_code = sigsegv_sicode2lsicode(si_code);
697 break;
698 case LINUX_SIGTRAP:
699 *lsi_code = sigtrap_sicode2lsicode(si_code);
700 break;
701 default:
702 *lsi_code = si_code;
703 break;
704 }
705 break;
706 }
707 }
708
709 void
siginfo_to_lsiginfo(const siginfo_t * si,l_siginfo_t * lsi,l_int sig)710 siginfo_to_lsiginfo(const siginfo_t *si, l_siginfo_t *lsi, l_int sig)
711 {
712
713 /* sig already converted */
714 lsi->lsi_signo = sig;
715 sicode_to_lsicode(sig, si->si_code, &lsi->lsi_code);
716
717 switch (si->si_code) {
718 case SI_LWP:
719 lsi->lsi_pid = si->si_pid;
720 lsi->lsi_uid = si->si_uid;
721 break;
722
723 case SI_TIMER:
724 lsi->lsi_int = si->si_value.sival_int;
725 lsi->lsi_ptr = PTROUT(si->si_value.sival_ptr);
726 lsi->lsi_tid = si->si_timerid;
727 break;
728
729 case SI_QUEUE:
730 lsi->lsi_pid = si->si_pid;
731 lsi->lsi_uid = si->si_uid;
732 lsi->lsi_ptr = PTROUT(si->si_value.sival_ptr);
733 break;
734
735 case SI_ASYNCIO:
736 lsi->lsi_int = si->si_value.sival_int;
737 lsi->lsi_ptr = PTROUT(si->si_value.sival_ptr);
738 break;
739
740 default:
741 switch (sig) {
742 case LINUX_SIGPOLL:
743 /* XXX si_fd? */
744 lsi->lsi_band = si->si_band;
745 break;
746
747 case LINUX_SIGCHLD:
748 lsi->lsi_errno = 0;
749 lsi->lsi_pid = si->si_pid;
750 lsi->lsi_uid = si->si_uid;
751
752 if (si->si_code == CLD_STOPPED || si->si_code == CLD_KILLED)
753 lsi->lsi_status = bsd_to_linux_signal(si->si_status);
754 else if (si->si_code == CLD_CONTINUED)
755 lsi->lsi_status = bsd_to_linux_signal(SIGCONT);
756 else
757 lsi->lsi_status = si->si_status;
758 break;
759
760 case LINUX_SIGBUS:
761 case LINUX_SIGILL:
762 case LINUX_SIGFPE:
763 case LINUX_SIGSEGV:
764 lsi->lsi_addr = PTROUT(si->si_addr);
765 break;
766
767 default:
768 lsi->lsi_pid = si->si_pid;
769 lsi->lsi_uid = si->si_uid;
770 if (sig >= LINUX_SIGRTMIN) {
771 lsi->lsi_int = si->si_value.sival_int;
772 lsi->lsi_ptr = PTROUT(si->si_value.sival_ptr);
773 }
774 break;
775 }
776 break;
777 }
778 }
779
780 static int
lsiginfo_to_siginfo(struct thread * td,const l_siginfo_t * lsi,siginfo_t * si,int sig)781 lsiginfo_to_siginfo(struct thread *td, const l_siginfo_t *lsi,
782 siginfo_t *si, int sig)
783 {
784
785 switch (lsi->lsi_code) {
786 case LINUX_SI_TKILL:
787 if (linux_kernver(td) >= LINUX_KERNVER(2,6,39)) {
788 linux_msg(td, "SI_TKILL forbidden since 2.6.39");
789 return (EPERM);
790 }
791 si->si_code = SI_LWP;
792 case LINUX_SI_QUEUE:
793 si->si_code = SI_QUEUE;
794 break;
795 case LINUX_SI_TIMER:
796 si->si_code = SI_TIMER;
797 break;
798 case LINUX_SI_MESGQ:
799 si->si_code = SI_MESGQ;
800 break;
801 case LINUX_SI_ASYNCIO:
802 si->si_code = SI_ASYNCIO;
803 break;
804 default:
805 si->si_code = lsi->lsi_code;
806 break;
807 }
808
809 si->si_signo = sig;
810 si->si_pid = td->td_proc->p_pid;
811 si->si_uid = td->td_ucred->cr_ruid;
812 si->si_value.sival_ptr = PTRIN(lsi->lsi_value.sival_ptr);
813 return (0);
814 }
815
816 int
linux_rt_sigqueueinfo(struct thread * td,struct linux_rt_sigqueueinfo_args * args)817 linux_rt_sigqueueinfo(struct thread *td, struct linux_rt_sigqueueinfo_args *args)
818 {
819 l_siginfo_t linfo;
820 ksiginfo_t ksi;
821 int error;
822 int sig;
823
824 if (!LINUX_SIG_VALID(args->sig))
825 return (EINVAL);
826
827 error = copyin(args->info, &linfo, sizeof(linfo));
828 if (error != 0)
829 return (error);
830
831 if (linfo.lsi_code >= 0)
832 /* SI_USER, SI_KERNEL */
833 return (EPERM);
834
835 sig = linux_to_bsd_signal(args->sig);
836 ksiginfo_init(&ksi);
837 error = lsiginfo_to_siginfo(td, &linfo, &ksi.ksi_info, sig);
838 if (error != 0)
839 return (error);
840
841 return (linux_pksignal(td, args->pid, sig, &ksi));
842 }
843
844 int
linux_rt_tgsigqueueinfo(struct thread * td,struct linux_rt_tgsigqueueinfo_args * args)845 linux_rt_tgsigqueueinfo(struct thread *td, struct linux_rt_tgsigqueueinfo_args *args)
846 {
847 l_siginfo_t linfo;
848 ksiginfo_t ksi;
849 int error;
850 int sig;
851
852 if (!LINUX_SIG_VALID(args->sig))
853 return (EINVAL);
854
855 error = copyin(args->uinfo, &linfo, sizeof(linfo));
856 if (error != 0)
857 return (error);
858
859 if (linfo.lsi_code >= 0)
860 return (EPERM);
861
862 sig = linux_to_bsd_signal(args->sig);
863 ksiginfo_init(&ksi);
864 error = lsiginfo_to_siginfo(td, &linfo, &ksi.ksi_info, sig);
865 if (error != 0)
866 return (error);
867
868 return (linux_tdksignal(td, args->tid, args->tgid, sig, &ksi));
869 }
870
871 int
linux_rt_sigsuspend(struct thread * td,struct linux_rt_sigsuspend_args * uap)872 linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap)
873 {
874 sigset_t sigmask;
875 int error;
876
877 error = linux_copyin_sigset(td, uap->newset, uap->sigsetsize,
878 &sigmask, NULL);
879 if (error != 0)
880 return (error);
881
882 return (kern_sigsuspend(td, sigmask));
883 }
884
885 static int
linux_tdksignal(struct thread * td,lwpid_t tid,int tgid,int sig,ksiginfo_t * ksi)886 linux_tdksignal(struct thread *td, lwpid_t tid, int tgid, int sig,
887 ksiginfo_t *ksi)
888 {
889 struct thread *tdt;
890 struct proc *p;
891 int error;
892
893 tdt = linux_tdfind(td, tid, tgid);
894 if (tdt == NULL)
895 return (ESRCH);
896
897 p = tdt->td_proc;
898 AUDIT_ARG_SIGNUM(sig);
899 AUDIT_ARG_PID(p->p_pid);
900 AUDIT_ARG_PROCESS(p);
901
902 error = p_cansignal(td, p, sig);
903 if (error != 0 || sig == 0)
904 goto out;
905
906 tdksignal(tdt, sig, ksi);
907
908 out:
909 PROC_UNLOCK(p);
910 return (error);
911 }
912
913 static int
linux_tdsignal(struct thread * td,lwpid_t tid,int tgid,int sig)914 linux_tdsignal(struct thread *td, lwpid_t tid, int tgid, int sig)
915 {
916 ksiginfo_t ksi;
917
918 ksiginfo_init(&ksi);
919 ksi.ksi_signo = sig;
920 ksi.ksi_code = SI_LWP;
921 ksi.ksi_pid = td->td_proc->p_pid;
922 ksi.ksi_uid = td->td_proc->p_ucred->cr_ruid;
923 return (linux_tdksignal(td, tid, tgid, sig, &ksi));
924 }
925
926 static int
linux_pksignal(struct thread * td,int pid,int sig,ksiginfo_t * ksi)927 linux_pksignal(struct thread *td, int pid, int sig, ksiginfo_t *ksi)
928 {
929 struct thread *tdt;
930 struct proc *p;
931 int error;
932
933 tdt = linux_tdfind(td, pid, -1);
934 if (tdt == NULL)
935 return (ESRCH);
936
937 p = tdt->td_proc;
938 AUDIT_ARG_SIGNUM(sig);
939 AUDIT_ARG_PID(p->p_pid);
940 AUDIT_ARG_PROCESS(p);
941
942 error = p_cansignal(td, p, sig);
943 if (error != 0 || sig == 0)
944 goto out;
945
946 pksignal(p, sig, ksi);
947
948 out:
949 PROC_UNLOCK(p);
950 return (error);
951 }
952
953 static int
linux_psignal(struct thread * td,int pid,int sig)954 linux_psignal(struct thread *td, int pid, int sig)
955 {
956 ksiginfo_t ksi;
957
958 ksiginfo_init(&ksi);
959 ksi.ksi_signo = sig;
960 ksi.ksi_code = SI_LWP;
961 ksi.ksi_pid = td->td_proc->p_pid;
962 ksi.ksi_uid = td->td_proc->p_ucred->cr_ruid;
963 return (linux_pksignal(td, pid, sig, &ksi));
964 }
965
966 int
linux_copyin_sigset(struct thread * td,l_sigset_t * lset,l_size_t sigsetsize,sigset_t * set,sigset_t ** pset)967 linux_copyin_sigset(struct thread *td, l_sigset_t *lset,
968 l_size_t sigsetsize, sigset_t *set, sigset_t **pset)
969 {
970 l_sigset_t lmask;
971 int error;
972
973 if (sigsetsize != sizeof(l_sigset_t))
974 return (EINVAL);
975 if (lset != NULL) {
976 error = copyin(lset, &lmask, sizeof(lmask));
977 if (error != 0)
978 return (error);
979 linux_to_bsd_sigset(&lmask, set);
980 if (pset != NULL)
981 *pset = set;
982 #ifdef KTRACE
983 if (KTRPOINT(td, KTR_STRUCT))
984 linux_ktrsigset(&lmask, sizeof(lmask));
985 #endif
986 } else if (pset != NULL)
987 *pset = NULL;
988 return (0);
989 }
990