2 * Copyright (c) 1982, 1986, 1989, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)kern_sig.c 8.7 (Berkeley) 4/18/94
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #include "opt_compat.h"
42 #include "opt_ktrace.h"
44 #include <sys/param.h>
45 #include <sys/ctype.h>
46 #include <sys/systm.h>
47 #include <sys/signalvar.h>
48 #include <sys/vnode.h>
51 #include <sys/capsicum.h>
52 #include <sys/condvar.h>
53 #include <sys/event.h>
54 #include <sys/fcntl.h>
55 #include <sys/imgact.h>
56 #include <sys/kernel.h>
58 #include <sys/ktrace.h>
60 #include <sys/malloc.h>
61 #include <sys/mutex.h>
62 #include <sys/refcount.h>
63 #include <sys/namei.h>
65 #include <sys/procdesc.h>
66 #include <sys/posix4.h>
67 #include <sys/pioctl.h>
68 #include <sys/racct.h>
69 #include <sys/resourcevar.h>
72 #include <sys/sleepqueue.h>
76 #include <sys/syscallsubr.h>
77 #include <sys/sysctl.h>
78 #include <sys/sysent.h>
79 #include <sys/syslog.h>
80 #include <sys/sysproto.h>
81 #include <sys/timers.h>
82 #include <sys/unistd.h>
85 #include <vm/vm_extern.h>
90 #include <machine/cpu.h>
92 #include <security/audit/audit.h>
94 #define ONSIG 32 /* NSIG for osig* syscalls. XXX. */
96 SDT_PROVIDER_DECLARE(proc);
97 SDT_PROBE_DEFINE3(proc, , , signal__send,
98 "struct thread *", "struct proc *", "int");
99 SDT_PROBE_DEFINE2(proc, , , signal__clear,
100 "int", "ksiginfo_t *");
101 SDT_PROBE_DEFINE3(proc, , , signal__discard,
102 "struct thread *", "struct proc *", "int");
104 static int coredump(struct thread *);
105 static int killpg1(struct thread *td, int sig, int pgid, int all,
107 static int issignal(struct thread *td);
108 static int sigprop(int sig);
109 static void tdsigwakeup(struct thread *, int, sig_t, int);
110 static int sig_suspend_threads(struct thread *, struct proc *, int);
111 static int filt_sigattach(struct knote *kn);
112 static void filt_sigdetach(struct knote *kn);
113 static int filt_signal(struct knote *kn, long hint);
114 static struct thread *sigtd(struct proc *p, int sig, int prop);
115 static void sigqueue_start(void);
117 static uma_zone_t ksiginfo_zone = NULL;
118 struct filterops sig_filtops = {
120 .f_attach = filt_sigattach,
121 .f_detach = filt_sigdetach,
122 .f_event = filt_signal,
125 static int kern_logsigexit = 1;
126 SYSCTL_INT(_kern, KERN_LOGSIGEXIT, logsigexit, CTLFLAG_RW,
128 "Log processes quitting on abnormal signals to syslog(3)");
130 static int kern_forcesigexit = 1;
131 SYSCTL_INT(_kern, OID_AUTO, forcesigexit, CTLFLAG_RW,
132 &kern_forcesigexit, 0, "Force trap signal to be handled");
134 static SYSCTL_NODE(_kern, OID_AUTO, sigqueue, CTLFLAG_RW, 0,
135 "POSIX real time signal");
137 static int max_pending_per_proc = 128;
138 SYSCTL_INT(_kern_sigqueue, OID_AUTO, max_pending_per_proc, CTLFLAG_RW,
139 &max_pending_per_proc, 0, "Max pending signals per proc");
141 static int preallocate_siginfo = 1024;
142 SYSCTL_INT(_kern_sigqueue, OID_AUTO, preallocate, CTLFLAG_RDTUN,
143 &preallocate_siginfo, 0, "Preallocated signal memory size");
145 static int signal_overflow = 0;
146 SYSCTL_INT(_kern_sigqueue, OID_AUTO, overflow, CTLFLAG_RD,
147 &signal_overflow, 0, "Number of signals overflew");
149 static int signal_alloc_fail = 0;
150 SYSCTL_INT(_kern_sigqueue, OID_AUTO, alloc_fail, CTLFLAG_RD,
151 &signal_alloc_fail, 0, "signals failed to be allocated");
153 static int kern_lognosys = 0;
154 SYSCTL_INT(_kern, OID_AUTO, lognosys, CTLFLAG_RWTUN, &kern_lognosys, 0,
155 "Log invalid syscalls");
157 SYSINIT(signal, SI_SUB_P1003_1B, SI_ORDER_FIRST+3, sigqueue_start, NULL);
160 * Policy -- Can ucred cr1 send SIGIO to process cr2?
161 * Should use cr_cansignal() once cr_cansignal() allows SIGIO and SIGURG
162 * in the right situations.
164 #define CANSIGIO(cr1, cr2) \
165 ((cr1)->cr_uid == 0 || \
166 (cr1)->cr_ruid == (cr2)->cr_ruid || \
167 (cr1)->cr_uid == (cr2)->cr_ruid || \
168 (cr1)->cr_ruid == (cr2)->cr_uid || \
169 (cr1)->cr_uid == (cr2)->cr_uid)
171 static int sugid_coredump;
172 SYSCTL_INT(_kern, OID_AUTO, sugid_coredump, CTLFLAG_RWTUN,
173 &sugid_coredump, 0, "Allow setuid and setgid processes to dump core");
175 static int capmode_coredump;
176 SYSCTL_INT(_kern, OID_AUTO, capmode_coredump, CTLFLAG_RWTUN,
177 &capmode_coredump, 0, "Allow processes in capability mode to dump core");
179 static int do_coredump = 1;
180 SYSCTL_INT(_kern, OID_AUTO, coredump, CTLFLAG_RW,
181 &do_coredump, 0, "Enable/Disable coredumps");
183 static int set_core_nodump_flag = 0;
184 SYSCTL_INT(_kern, OID_AUTO, nodump_coredump, CTLFLAG_RW, &set_core_nodump_flag,
185 0, "Enable setting the NODUMP flag on coredump files");
187 static int coredump_devctl = 0;
188 SYSCTL_INT(_kern, OID_AUTO, coredump_devctl, CTLFLAG_RW, &coredump_devctl,
189 0, "Generate a devctl notification when processes coredump");
192 * Signal properties and actions.
193 * The array below categorizes the signals and their default actions
194 * according to the following properties:
196 #define SA_KILL 0x01 /* terminates process by default */
197 #define SA_CORE 0x02 /* ditto and coredumps */
198 #define SA_STOP 0x04 /* suspend process */
199 #define SA_TTYSTOP 0x08 /* ditto, from tty */
200 #define SA_IGNORE 0x10 /* ignore by default */
201 #define SA_CONT 0x20 /* continue if suspended */
202 #define SA_CANTMASK 0x40 /* non-maskable, catchable */
204 static int sigproptbl[NSIG] = {
205 SA_KILL, /* SIGHUP */
206 SA_KILL, /* SIGINT */
207 SA_KILL|SA_CORE, /* SIGQUIT */
208 SA_KILL|SA_CORE, /* SIGILL */
209 SA_KILL|SA_CORE, /* SIGTRAP */
210 SA_KILL|SA_CORE, /* SIGABRT */
211 SA_KILL|SA_CORE, /* SIGEMT */
212 SA_KILL|SA_CORE, /* SIGFPE */
213 SA_KILL, /* SIGKILL */
214 SA_KILL|SA_CORE, /* SIGBUS */
215 SA_KILL|SA_CORE, /* SIGSEGV */
216 SA_KILL|SA_CORE, /* SIGSYS */
217 SA_KILL, /* SIGPIPE */
218 SA_KILL, /* SIGALRM */
219 SA_KILL, /* SIGTERM */
220 SA_IGNORE, /* SIGURG */
221 SA_STOP, /* SIGSTOP */
222 SA_STOP|SA_TTYSTOP, /* SIGTSTP */
223 SA_IGNORE|SA_CONT, /* SIGCONT */
224 SA_IGNORE, /* SIGCHLD */
225 SA_STOP|SA_TTYSTOP, /* SIGTTIN */
226 SA_STOP|SA_TTYSTOP, /* SIGTTOU */
227 SA_IGNORE, /* SIGIO */
228 SA_KILL, /* SIGXCPU */
229 SA_KILL, /* SIGXFSZ */
230 SA_KILL, /* SIGVTALRM */
231 SA_KILL, /* SIGPROF */
232 SA_IGNORE, /* SIGWINCH */
233 SA_IGNORE, /* SIGINFO */
234 SA_KILL, /* SIGUSR1 */
235 SA_KILL, /* SIGUSR2 */
238 static void reschedule_signals(struct proc *p, sigset_t block, int flags);
243 ksiginfo_zone = uma_zcreate("ksiginfo", sizeof(ksiginfo_t),
244 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
245 uma_prealloc(ksiginfo_zone, preallocate_siginfo);
246 p31b_setcfg(CTL_P1003_1B_REALTIME_SIGNALS, _POSIX_REALTIME_SIGNALS);
247 p31b_setcfg(CTL_P1003_1B_RTSIG_MAX, SIGRTMAX - SIGRTMIN + 1);
248 p31b_setcfg(CTL_P1003_1B_SIGQUEUE_MAX, max_pending_per_proc);
252 ksiginfo_alloc(int wait)
259 if (ksiginfo_zone != NULL)
260 return ((ksiginfo_t *)uma_zalloc(ksiginfo_zone, flags));
265 ksiginfo_free(ksiginfo_t *ksi)
267 uma_zfree(ksiginfo_zone, ksi);
271 ksiginfo_tryfree(ksiginfo_t *ksi)
273 if (!(ksi->ksi_flags & KSI_EXT)) {
274 uma_zfree(ksiginfo_zone, ksi);
281 sigqueue_init(sigqueue_t *list, struct proc *p)
283 SIGEMPTYSET(list->sq_signals);
284 SIGEMPTYSET(list->sq_kill);
285 SIGEMPTYSET(list->sq_ptrace);
286 TAILQ_INIT(&list->sq_list);
288 list->sq_flags = SQ_INIT;
292 * Get a signal's ksiginfo.
294 * 0 - signal not found
295 * others - signal number
298 sigqueue_get(sigqueue_t *sq, int signo, ksiginfo_t *si)
300 struct proc *p = sq->sq_proc;
301 struct ksiginfo *ksi, *next;
304 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
306 if (!SIGISMEMBER(sq->sq_signals, signo))
309 if (SIGISMEMBER(sq->sq_ptrace, signo)) {
311 SIGDELSET(sq->sq_ptrace, signo);
312 si->ksi_flags |= KSI_PTRACE;
314 if (SIGISMEMBER(sq->sq_kill, signo)) {
317 SIGDELSET(sq->sq_kill, signo);
320 TAILQ_FOREACH_SAFE(ksi, &sq->sq_list, ksi_link, next) {
321 if (ksi->ksi_signo == signo) {
323 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
324 ksi->ksi_sigq = NULL;
325 ksiginfo_copy(ksi, si);
326 if (ksiginfo_tryfree(ksi) && p != NULL)
335 SIGDELSET(sq->sq_signals, signo);
336 si->ksi_signo = signo;
341 sigqueue_take(ksiginfo_t *ksi)
347 if (ksi == NULL || (sq = ksi->ksi_sigq) == NULL)
351 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
352 ksi->ksi_sigq = NULL;
353 if (!(ksi->ksi_flags & KSI_EXT) && p != NULL)
356 for (kp = TAILQ_FIRST(&sq->sq_list); kp != NULL;
357 kp = TAILQ_NEXT(kp, ksi_link)) {
358 if (kp->ksi_signo == ksi->ksi_signo)
361 if (kp == NULL && !SIGISMEMBER(sq->sq_kill, ksi->ksi_signo) &&
362 !SIGISMEMBER(sq->sq_ptrace, ksi->ksi_signo))
363 SIGDELSET(sq->sq_signals, ksi->ksi_signo);
367 sigqueue_add(sigqueue_t *sq, int signo, ksiginfo_t *si)
369 struct proc *p = sq->sq_proc;
370 struct ksiginfo *ksi;
373 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
376 * SIGKILL/SIGSTOP cannot be caught or masked, so take the fast path
379 if (signo == SIGKILL || signo == SIGSTOP || si == NULL) {
380 SIGADDSET(sq->sq_kill, signo);
384 /* directly insert the ksi, don't copy it */
385 if (si->ksi_flags & KSI_INS) {
386 if (si->ksi_flags & KSI_HEAD)
387 TAILQ_INSERT_HEAD(&sq->sq_list, si, ksi_link);
389 TAILQ_INSERT_TAIL(&sq->sq_list, si, ksi_link);
394 if (__predict_false(ksiginfo_zone == NULL)) {
395 SIGADDSET(sq->sq_kill, signo);
399 if (p != NULL && p->p_pendingcnt >= max_pending_per_proc) {
402 } else if ((ksi = ksiginfo_alloc(0)) == NULL) {
408 ksiginfo_copy(si, ksi);
409 ksi->ksi_signo = signo;
410 if (si->ksi_flags & KSI_HEAD)
411 TAILQ_INSERT_HEAD(&sq->sq_list, ksi, ksi_link);
413 TAILQ_INSERT_TAIL(&sq->sq_list, ksi, ksi_link);
418 if ((si->ksi_flags & KSI_PTRACE) != 0) {
419 SIGADDSET(sq->sq_ptrace, signo);
422 } else if ((si->ksi_flags & KSI_TRAP) != 0 ||
423 (si->ksi_flags & KSI_SIGQ) == 0) {
424 SIGADDSET(sq->sq_kill, signo);
432 SIGADDSET(sq->sq_signals, signo);
437 sigqueue_flush(sigqueue_t *sq)
439 struct proc *p = sq->sq_proc;
442 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
445 PROC_LOCK_ASSERT(p, MA_OWNED);
447 while ((ksi = TAILQ_FIRST(&sq->sq_list)) != NULL) {
448 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
449 ksi->ksi_sigq = NULL;
450 if (ksiginfo_tryfree(ksi) && p != NULL)
454 SIGEMPTYSET(sq->sq_signals);
455 SIGEMPTYSET(sq->sq_kill);
456 SIGEMPTYSET(sq->sq_ptrace);
460 sigqueue_move_set(sigqueue_t *src, sigqueue_t *dst, const sigset_t *set)
463 struct proc *p1, *p2;
464 ksiginfo_t *ksi, *next;
466 KASSERT(src->sq_flags & SQ_INIT, ("src sigqueue not inited"));
467 KASSERT(dst->sq_flags & SQ_INIT, ("dst sigqueue not inited"));
470 /* Move siginfo to target list */
471 TAILQ_FOREACH_SAFE(ksi, &src->sq_list, ksi_link, next) {
472 if (SIGISMEMBER(*set, ksi->ksi_signo)) {
473 TAILQ_REMOVE(&src->sq_list, ksi, ksi_link);
476 TAILQ_INSERT_TAIL(&dst->sq_list, ksi, ksi_link);
483 /* Move pending bits to target list */
485 SIGSETAND(tmp, *set);
486 SIGSETOR(dst->sq_kill, tmp);
487 SIGSETNAND(src->sq_kill, tmp);
489 tmp = src->sq_ptrace;
490 SIGSETAND(tmp, *set);
491 SIGSETOR(dst->sq_ptrace, tmp);
492 SIGSETNAND(src->sq_ptrace, tmp);
494 tmp = src->sq_signals;
495 SIGSETAND(tmp, *set);
496 SIGSETOR(dst->sq_signals, tmp);
497 SIGSETNAND(src->sq_signals, tmp);
502 sigqueue_move(sigqueue_t *src, sigqueue_t *dst, int signo)
507 SIGADDSET(set, signo);
508 sigqueue_move_set(src, dst, &set);
513 sigqueue_delete_set(sigqueue_t *sq, const sigset_t *set)
515 struct proc *p = sq->sq_proc;
516 ksiginfo_t *ksi, *next;
518 KASSERT(sq->sq_flags & SQ_INIT, ("src sigqueue not inited"));
520 /* Remove siginfo queue */
521 TAILQ_FOREACH_SAFE(ksi, &sq->sq_list, ksi_link, next) {
522 if (SIGISMEMBER(*set, ksi->ksi_signo)) {
523 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
524 ksi->ksi_sigq = NULL;
525 if (ksiginfo_tryfree(ksi) && p != NULL)
529 SIGSETNAND(sq->sq_kill, *set);
530 SIGSETNAND(sq->sq_ptrace, *set);
531 SIGSETNAND(sq->sq_signals, *set);
535 sigqueue_delete(sigqueue_t *sq, int signo)
540 SIGADDSET(set, signo);
541 sigqueue_delete_set(sq, &set);
544 /* Remove a set of signals for a process */
546 sigqueue_delete_set_proc(struct proc *p, const sigset_t *set)
551 PROC_LOCK_ASSERT(p, MA_OWNED);
553 sigqueue_init(&worklist, NULL);
554 sigqueue_move_set(&p->p_sigqueue, &worklist, set);
556 FOREACH_THREAD_IN_PROC(p, td0)
557 sigqueue_move_set(&td0->td_sigqueue, &worklist, set);
559 sigqueue_flush(&worklist);
563 sigqueue_delete_proc(struct proc *p, int signo)
568 SIGADDSET(set, signo);
569 sigqueue_delete_set_proc(p, &set);
573 sigqueue_delete_stopmask_proc(struct proc *p)
578 SIGADDSET(set, SIGSTOP);
579 SIGADDSET(set, SIGTSTP);
580 SIGADDSET(set, SIGTTIN);
581 SIGADDSET(set, SIGTTOU);
582 sigqueue_delete_set_proc(p, &set);
586 * Determine signal that should be delivered to thread td, the current
587 * thread, 0 if none. If there is a pending stop signal with default
588 * action, the process stops in issignal().
591 cursig(struct thread *td)
593 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
594 mtx_assert(&td->td_proc->p_sigacts->ps_mtx, MA_OWNED);
595 THREAD_LOCK_ASSERT(td, MA_NOTOWNED);
596 return (SIGPENDING(td) ? issignal(td) : 0);
600 * Arrange for ast() to handle unmasked pending signals on return to user
601 * mode. This must be called whenever a signal is added to td_sigqueue or
602 * unmasked in td_sigmask.
605 signotify(struct thread *td)
611 PROC_LOCK_ASSERT(p, MA_OWNED);
613 if (SIGPENDING(td)) {
615 td->td_flags |= TDF_NEEDSIGCHK | TDF_ASTPENDING;
621 * Returns 1 (true) if altstack is configured for the thread, and the
622 * passed stack bottom address falls into the altstack range. Handles
623 * the 43 compat special case where the alt stack size is zero.
626 sigonstack(size_t sp)
631 if ((td->td_pflags & TDP_ALTSTACK) == 0)
633 #if defined(COMPAT_43)
634 if (td->td_sigstk.ss_size == 0)
635 return ((td->td_sigstk.ss_flags & SS_ONSTACK) != 0);
637 return (sp >= (size_t)td->td_sigstk.ss_sp &&
638 sp < td->td_sigstk.ss_size + (size_t)td->td_sigstk.ss_sp);
645 if (sig > 0 && sig < NSIG)
646 return (sigproptbl[_SIG_IDX(sig)]);
651 sig_ffs(sigset_t *set)
655 for (i = 0; i < _SIG_WORDS; i++)
657 return (ffs(set->__bits[i]) + (i * 32));
662 sigact_flag_test(const struct sigaction *act, int flag)
666 * SA_SIGINFO is reset when signal disposition is set to
667 * ignore or default. Other flags are kept according to user
670 return ((act->sa_flags & flag) != 0 && (flag != SA_SIGINFO ||
671 ((__sighandler_t *)act->sa_sigaction != SIG_IGN &&
672 (__sighandler_t *)act->sa_sigaction != SIG_DFL)));
682 kern_sigaction(struct thread *td, int sig, const struct sigaction *act,
683 struct sigaction *oact, int flags)
686 struct proc *p = td->td_proc;
688 if (!_SIG_VALID(sig))
690 if (act != NULL && act->sa_handler != SIG_DFL &&
691 act->sa_handler != SIG_IGN && (act->sa_flags & ~(SA_ONSTACK |
692 SA_RESTART | SA_RESETHAND | SA_NOCLDSTOP | SA_NODEFER |
693 SA_NOCLDWAIT | SA_SIGINFO)) != 0)
698 mtx_lock(&ps->ps_mtx);
700 memset(oact, 0, sizeof(*oact));
701 oact->sa_mask = ps->ps_catchmask[_SIG_IDX(sig)];
702 if (SIGISMEMBER(ps->ps_sigonstack, sig))
703 oact->sa_flags |= SA_ONSTACK;
704 if (!SIGISMEMBER(ps->ps_sigintr, sig))
705 oact->sa_flags |= SA_RESTART;
706 if (SIGISMEMBER(ps->ps_sigreset, sig))
707 oact->sa_flags |= SA_RESETHAND;
708 if (SIGISMEMBER(ps->ps_signodefer, sig))
709 oact->sa_flags |= SA_NODEFER;
710 if (SIGISMEMBER(ps->ps_siginfo, sig)) {
711 oact->sa_flags |= SA_SIGINFO;
713 (__siginfohandler_t *)ps->ps_sigact[_SIG_IDX(sig)];
715 oact->sa_handler = ps->ps_sigact[_SIG_IDX(sig)];
716 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDSTOP)
717 oact->sa_flags |= SA_NOCLDSTOP;
718 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDWAIT)
719 oact->sa_flags |= SA_NOCLDWAIT;
722 if ((sig == SIGKILL || sig == SIGSTOP) &&
723 act->sa_handler != SIG_DFL) {
724 mtx_unlock(&ps->ps_mtx);
730 * Change setting atomically.
733 ps->ps_catchmask[_SIG_IDX(sig)] = act->sa_mask;
734 SIG_CANTMASK(ps->ps_catchmask[_SIG_IDX(sig)]);
735 if (sigact_flag_test(act, SA_SIGINFO)) {
736 ps->ps_sigact[_SIG_IDX(sig)] =
737 (__sighandler_t *)act->sa_sigaction;
738 SIGADDSET(ps->ps_siginfo, sig);
740 ps->ps_sigact[_SIG_IDX(sig)] = act->sa_handler;
741 SIGDELSET(ps->ps_siginfo, sig);
743 if (!sigact_flag_test(act, SA_RESTART))
744 SIGADDSET(ps->ps_sigintr, sig);
746 SIGDELSET(ps->ps_sigintr, sig);
747 if (sigact_flag_test(act, SA_ONSTACK))
748 SIGADDSET(ps->ps_sigonstack, sig);
750 SIGDELSET(ps->ps_sigonstack, sig);
751 if (sigact_flag_test(act, SA_RESETHAND))
752 SIGADDSET(ps->ps_sigreset, sig);
754 SIGDELSET(ps->ps_sigreset, sig);
755 if (sigact_flag_test(act, SA_NODEFER))
756 SIGADDSET(ps->ps_signodefer, sig);
758 SIGDELSET(ps->ps_signodefer, sig);
759 if (sig == SIGCHLD) {
760 if (act->sa_flags & SA_NOCLDSTOP)
761 ps->ps_flag |= PS_NOCLDSTOP;
763 ps->ps_flag &= ~PS_NOCLDSTOP;
764 if (act->sa_flags & SA_NOCLDWAIT) {
766 * Paranoia: since SA_NOCLDWAIT is implemented
767 * by reparenting the dying child to PID 1 (and
768 * trust it to reap the zombie), PID 1 itself
769 * is forbidden to set SA_NOCLDWAIT.
772 ps->ps_flag &= ~PS_NOCLDWAIT;
774 ps->ps_flag |= PS_NOCLDWAIT;
776 ps->ps_flag &= ~PS_NOCLDWAIT;
777 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN)
778 ps->ps_flag |= PS_CLDSIGIGN;
780 ps->ps_flag &= ~PS_CLDSIGIGN;
783 * Set bit in ps_sigignore for signals that are set to SIG_IGN,
784 * and for signals set to SIG_DFL where the default is to
785 * ignore. However, don't put SIGCONT in ps_sigignore, as we
786 * have to restart the process.
788 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
789 (sigprop(sig) & SA_IGNORE &&
790 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)) {
791 /* never to be seen again */
792 sigqueue_delete_proc(p, sig);
794 /* easier in psignal */
795 SIGADDSET(ps->ps_sigignore, sig);
796 SIGDELSET(ps->ps_sigcatch, sig);
798 SIGDELSET(ps->ps_sigignore, sig);
799 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)
800 SIGDELSET(ps->ps_sigcatch, sig);
802 SIGADDSET(ps->ps_sigcatch, sig);
804 #ifdef COMPAT_FREEBSD4
805 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
806 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL ||
807 (flags & KSA_FREEBSD4) == 0)
808 SIGDELSET(ps->ps_freebsd4, sig);
810 SIGADDSET(ps->ps_freebsd4, sig);
813 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
814 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL ||
815 (flags & KSA_OSIGSET) == 0)
816 SIGDELSET(ps->ps_osigset, sig);
818 SIGADDSET(ps->ps_osigset, sig);
821 mtx_unlock(&ps->ps_mtx);
826 #ifndef _SYS_SYSPROTO_H_
827 struct sigaction_args {
829 struct sigaction *act;
830 struct sigaction *oact;
834 sys_sigaction(struct thread *td, struct sigaction_args *uap)
836 struct sigaction act, oact;
837 struct sigaction *actp, *oactp;
840 actp = (uap->act != NULL) ? &act : NULL;
841 oactp = (uap->oact != NULL) ? &oact : NULL;
843 error = copyin(uap->act, actp, sizeof(act));
847 error = kern_sigaction(td, uap->sig, actp, oactp, 0);
849 error = copyout(oactp, uap->oact, sizeof(oact));
853 #ifdef COMPAT_FREEBSD4
854 #ifndef _SYS_SYSPROTO_H_
855 struct freebsd4_sigaction_args {
857 struct sigaction *act;
858 struct sigaction *oact;
862 freebsd4_sigaction(struct thread *td, struct freebsd4_sigaction_args *uap)
864 struct sigaction act, oact;
865 struct sigaction *actp, *oactp;
869 actp = (uap->act != NULL) ? &act : NULL;
870 oactp = (uap->oact != NULL) ? &oact : NULL;
872 error = copyin(uap->act, actp, sizeof(act));
876 error = kern_sigaction(td, uap->sig, actp, oactp, KSA_FREEBSD4);
878 error = copyout(oactp, uap->oact, sizeof(oact));
881 #endif /* COMAPT_FREEBSD4 */
883 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
884 #ifndef _SYS_SYSPROTO_H_
885 struct osigaction_args {
887 struct osigaction *nsa;
888 struct osigaction *osa;
892 osigaction(struct thread *td, struct osigaction_args *uap)
894 struct osigaction sa;
895 struct sigaction nsa, osa;
896 struct sigaction *nsap, *osap;
899 if (uap->signum <= 0 || uap->signum >= ONSIG)
902 nsap = (uap->nsa != NULL) ? &nsa : NULL;
903 osap = (uap->osa != NULL) ? &osa : NULL;
906 error = copyin(uap->nsa, &sa, sizeof(sa));
909 nsap->sa_handler = sa.sa_handler;
910 nsap->sa_flags = sa.sa_flags;
911 OSIG2SIG(sa.sa_mask, nsap->sa_mask);
913 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET);
914 if (osap && !error) {
915 sa.sa_handler = osap->sa_handler;
916 sa.sa_flags = osap->sa_flags;
917 SIG2OSIG(osap->sa_mask, sa.sa_mask);
918 error = copyout(&sa, uap->osa, sizeof(sa));
923 #if !defined(__i386__)
924 /* Avoid replicating the same stub everywhere */
926 osigreturn(struct thread *td, struct osigreturn_args *uap)
929 return (nosys(td, (struct nosys_args *)uap));
932 #endif /* COMPAT_43 */
935 * Initialize signal state for process 0;
936 * set to ignore signals that are ignored by default.
939 siginit(struct proc *p)
946 mtx_lock(&ps->ps_mtx);
947 for (i = 1; i <= NSIG; i++) {
948 if (sigprop(i) & SA_IGNORE && i != SIGCONT) {
949 SIGADDSET(ps->ps_sigignore, i);
952 mtx_unlock(&ps->ps_mtx);
957 * Reset specified signal to the default disposition.
960 sigdflt(struct sigacts *ps, int sig)
963 mtx_assert(&ps->ps_mtx, MA_OWNED);
964 SIGDELSET(ps->ps_sigcatch, sig);
965 if ((sigprop(sig) & SA_IGNORE) != 0 && sig != SIGCONT)
966 SIGADDSET(ps->ps_sigignore, sig);
967 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
968 SIGDELSET(ps->ps_siginfo, sig);
972 * Reset signals for an exec of the specified process.
975 execsigs(struct proc *p)
983 * Reset caught signals. Held signals remain held
984 * through td_sigmask (unless they were caught,
985 * and are now ignored by default).
987 PROC_LOCK_ASSERT(p, MA_OWNED);
989 mtx_lock(&ps->ps_mtx);
990 while (SIGNOTEMPTY(ps->ps_sigcatch)) {
991 sig = sig_ffs(&ps->ps_sigcatch);
993 if ((sigprop(sig) & SA_IGNORE) != 0)
994 sigqueue_delete_proc(p, sig);
998 * As CloudABI processes cannot modify signal handlers, fully
999 * reset all signals to their default behavior. Do ignore
1000 * SIGPIPE, as it would otherwise be impossible to recover from
1001 * writes to broken pipes and sockets.
1003 if (SV_PROC_ABI(p) == SV_ABI_CLOUDABI) {
1004 osigignore = ps->ps_sigignore;
1005 while (SIGNOTEMPTY(osigignore)) {
1006 sig = sig_ffs(&osigignore);
1007 SIGDELSET(osigignore, sig);
1011 SIGADDSET(ps->ps_sigignore, SIGPIPE);
1015 * Reset stack state to the user stack.
1016 * Clear set of signals caught on the signal stack.
1019 MPASS(td->td_proc == p);
1020 td->td_sigstk.ss_flags = SS_DISABLE;
1021 td->td_sigstk.ss_size = 0;
1022 td->td_sigstk.ss_sp = 0;
1023 td->td_pflags &= ~TDP_ALTSTACK;
1025 * Reset no zombies if child dies flag as Solaris does.
1027 ps->ps_flag &= ~(PS_NOCLDWAIT | PS_CLDSIGIGN);
1028 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN)
1029 ps->ps_sigact[_SIG_IDX(SIGCHLD)] = SIG_DFL;
1030 mtx_unlock(&ps->ps_mtx);
1034 * kern_sigprocmask()
1036 * Manipulate signal mask.
1039 kern_sigprocmask(struct thread *td, int how, sigset_t *set, sigset_t *oset,
1042 sigset_t new_block, oset1;
1047 if ((flags & SIGPROCMASK_PROC_LOCKED) != 0)
1048 PROC_LOCK_ASSERT(p, MA_OWNED);
1051 mtx_assert(&p->p_sigacts->ps_mtx, (flags & SIGPROCMASK_PS_LOCKED) != 0
1052 ? MA_OWNED : MA_NOTOWNED);
1054 *oset = td->td_sigmask;
1061 oset1 = td->td_sigmask;
1062 SIGSETOR(td->td_sigmask, *set);
1063 new_block = td->td_sigmask;
1064 SIGSETNAND(new_block, oset1);
1067 SIGSETNAND(td->td_sigmask, *set);
1072 oset1 = td->td_sigmask;
1073 if (flags & SIGPROCMASK_OLD)
1074 SIGSETLO(td->td_sigmask, *set);
1076 td->td_sigmask = *set;
1077 new_block = td->td_sigmask;
1078 SIGSETNAND(new_block, oset1);
1087 * The new_block set contains signals that were not previously
1088 * blocked, but are blocked now.
1090 * In case we block any signal that was not previously blocked
1091 * for td, and process has the signal pending, try to schedule
1092 * signal delivery to some thread that does not block the
1093 * signal, possibly waking it up.
1095 if (p->p_numthreads != 1)
1096 reschedule_signals(p, new_block, flags);
1100 if (!(flags & SIGPROCMASK_PROC_LOCKED))
1105 #ifndef _SYS_SYSPROTO_H_
1106 struct sigprocmask_args {
1108 const sigset_t *set;
1113 sys_sigprocmask(struct thread *td, struct sigprocmask_args *uap)
1116 sigset_t *setp, *osetp;
1119 setp = (uap->set != NULL) ? &set : NULL;
1120 osetp = (uap->oset != NULL) ? &oset : NULL;
1122 error = copyin(uap->set, setp, sizeof(set));
1126 error = kern_sigprocmask(td, uap->how, setp, osetp, 0);
1127 if (osetp && !error) {
1128 error = copyout(osetp, uap->oset, sizeof(oset));
1133 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1134 #ifndef _SYS_SYSPROTO_H_
1135 struct osigprocmask_args {
1141 osigprocmask(struct thread *td, struct osigprocmask_args *uap)
1146 OSIG2SIG(uap->mask, set);
1147 error = kern_sigprocmask(td, uap->how, &set, &oset, 1);
1148 SIG2OSIG(oset, td->td_retval[0]);
1151 #endif /* COMPAT_43 */
1154 sys_sigwait(struct thread *td, struct sigwait_args *uap)
1160 error = copyin(uap->set, &set, sizeof(set));
1162 td->td_retval[0] = error;
1166 error = kern_sigtimedwait(td, set, &ksi, NULL);
1168 if (error == EINTR && td->td_proc->p_osrel < P_OSREL_SIGWAIT)
1170 if (error == ERESTART)
1172 td->td_retval[0] = error;
1176 error = copyout(&ksi.ksi_signo, uap->sig, sizeof(ksi.ksi_signo));
1177 td->td_retval[0] = error;
1182 sys_sigtimedwait(struct thread *td, struct sigtimedwait_args *uap)
1185 struct timespec *timeout;
1191 error = copyin(uap->timeout, &ts, sizeof(ts));
1199 error = copyin(uap->set, &set, sizeof(set));
1203 error = kern_sigtimedwait(td, set, &ksi, timeout);
1208 error = copyout(&ksi.ksi_info, uap->info, sizeof(siginfo_t));
1211 td->td_retval[0] = ksi.ksi_signo;
1216 sys_sigwaitinfo(struct thread *td, struct sigwaitinfo_args *uap)
1222 error = copyin(uap->set, &set, sizeof(set));
1226 error = kern_sigtimedwait(td, set, &ksi, NULL);
1231 error = copyout(&ksi.ksi_info, uap->info, sizeof(siginfo_t));
1234 td->td_retval[0] = ksi.ksi_signo;
1239 proc_td_siginfo_capture(struct thread *td, siginfo_t *si)
1243 FOREACH_THREAD_IN_PROC(td->td_proc, thr) {
1247 thr->td_si.si_signo = 0;
1252 kern_sigtimedwait(struct thread *td, sigset_t waitset, ksiginfo_t *ksi,
1253 struct timespec *timeout)
1256 sigset_t saved_mask, new_block;
1258 int error, sig, timo, timevalid = 0;
1259 struct timespec rts, ets, ts;
1267 if (timeout != NULL) {
1268 if (timeout->tv_nsec >= 0 && timeout->tv_nsec < 1000000000) {
1270 getnanouptime(&rts);
1272 timespecadd(&ets, timeout);
1276 /* Some signals can not be waited for. */
1277 SIG_CANTMASK(waitset);
1280 saved_mask = td->td_sigmask;
1281 SIGSETNAND(td->td_sigmask, waitset);
1283 mtx_lock(&ps->ps_mtx);
1285 mtx_unlock(&ps->ps_mtx);
1286 KASSERT(sig >= 0, ("sig %d", sig));
1287 if (sig != 0 && SIGISMEMBER(waitset, sig)) {
1288 if (sigqueue_get(&td->td_sigqueue, sig, ksi) != 0 ||
1289 sigqueue_get(&p->p_sigqueue, sig, ksi) != 0) {
1299 * POSIX says this must be checked after looking for pending
1302 if (timeout != NULL) {
1307 getnanouptime(&rts);
1308 if (timespeccmp(&rts, &ets, >=)) {
1313 timespecsub(&ts, &rts);
1314 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1320 error = msleep(ps, &p->p_mtx, PPAUSE|PCATCH, "sigwait", timo);
1322 if (timeout != NULL) {
1323 if (error == ERESTART) {
1324 /* Timeout can not be restarted. */
1326 } else if (error == EAGAIN) {
1327 /* We will calculate timeout by ourself. */
1333 new_block = saved_mask;
1334 SIGSETNAND(new_block, td->td_sigmask);
1335 td->td_sigmask = saved_mask;
1337 * Fewer signals can be delivered to us, reschedule signal
1340 if (p->p_numthreads != 1)
1341 reschedule_signals(p, new_block, 0);
1344 SDT_PROBE2(proc, , , signal__clear, sig, ksi);
1346 if (ksi->ksi_code == SI_TIMER)
1347 itimer_accept(p, ksi->ksi_timerid, ksi);
1350 if (KTRPOINT(td, KTR_PSIG)) {
1353 mtx_lock(&ps->ps_mtx);
1354 action = ps->ps_sigact[_SIG_IDX(sig)];
1355 mtx_unlock(&ps->ps_mtx);
1356 ktrpsig(sig, action, &td->td_sigmask, ksi->ksi_code);
1359 if (sig == SIGKILL) {
1360 proc_td_siginfo_capture(td, &ksi->ksi_info);
1368 #ifndef _SYS_SYSPROTO_H_
1369 struct sigpending_args {
1374 sys_sigpending(struct thread *td, struct sigpending_args *uap)
1376 struct proc *p = td->td_proc;
1380 pending = p->p_sigqueue.sq_signals;
1381 SIGSETOR(pending, td->td_sigqueue.sq_signals);
1383 return (copyout(&pending, uap->set, sizeof(sigset_t)));
1386 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1387 #ifndef _SYS_SYSPROTO_H_
1388 struct osigpending_args {
1393 osigpending(struct thread *td, struct osigpending_args *uap)
1395 struct proc *p = td->td_proc;
1399 pending = p->p_sigqueue.sq_signals;
1400 SIGSETOR(pending, td->td_sigqueue.sq_signals);
1402 SIG2OSIG(pending, td->td_retval[0]);
1405 #endif /* COMPAT_43 */
1407 #if defined(COMPAT_43)
1409 * Generalized interface signal handler, 4.3-compatible.
1411 #ifndef _SYS_SYSPROTO_H_
1412 struct osigvec_args {
1420 osigvec(struct thread *td, struct osigvec_args *uap)
1423 struct sigaction nsa, osa;
1424 struct sigaction *nsap, *osap;
1427 if (uap->signum <= 0 || uap->signum >= ONSIG)
1429 nsap = (uap->nsv != NULL) ? &nsa : NULL;
1430 osap = (uap->osv != NULL) ? &osa : NULL;
1432 error = copyin(uap->nsv, &vec, sizeof(vec));
1435 nsap->sa_handler = vec.sv_handler;
1436 OSIG2SIG(vec.sv_mask, nsap->sa_mask);
1437 nsap->sa_flags = vec.sv_flags;
1438 nsap->sa_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */
1440 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET);
1441 if (osap && !error) {
1442 vec.sv_handler = osap->sa_handler;
1443 SIG2OSIG(osap->sa_mask, vec.sv_mask);
1444 vec.sv_flags = osap->sa_flags;
1445 vec.sv_flags &= ~SA_NOCLDWAIT;
1446 vec.sv_flags ^= SA_RESTART;
1447 error = copyout(&vec, uap->osv, sizeof(vec));
1452 #ifndef _SYS_SYSPROTO_H_
1453 struct osigblock_args {
1458 osigblock(struct thread *td, struct osigblock_args *uap)
1462 OSIG2SIG(uap->mask, set);
1463 kern_sigprocmask(td, SIG_BLOCK, &set, &oset, 0);
1464 SIG2OSIG(oset, td->td_retval[0]);
1468 #ifndef _SYS_SYSPROTO_H_
1469 struct osigsetmask_args {
1474 osigsetmask(struct thread *td, struct osigsetmask_args *uap)
1478 OSIG2SIG(uap->mask, set);
1479 kern_sigprocmask(td, SIG_SETMASK, &set, &oset, 0);
1480 SIG2OSIG(oset, td->td_retval[0]);
1483 #endif /* COMPAT_43 */
1486 * Suspend calling thread until signal, providing mask to be set in the
1489 #ifndef _SYS_SYSPROTO_H_
1490 struct sigsuspend_args {
1491 const sigset_t *sigmask;
1496 sys_sigsuspend(struct thread *td, struct sigsuspend_args *uap)
1501 error = copyin(uap->sigmask, &mask, sizeof(mask));
1504 return (kern_sigsuspend(td, mask));
1508 kern_sigsuspend(struct thread *td, sigset_t mask)
1510 struct proc *p = td->td_proc;
1514 * When returning from sigsuspend, we want
1515 * the old mask to be restored after the
1516 * signal handler has finished. Thus, we
1517 * save it here and mark the sigacts structure
1521 kern_sigprocmask(td, SIG_SETMASK, &mask, &td->td_oldsigmask,
1522 SIGPROCMASK_PROC_LOCKED);
1523 td->td_pflags |= TDP_OLDMASK;
1526 * Process signals now. Otherwise, we can get spurious wakeup
1527 * due to signal entered process queue, but delivered to other
1528 * thread. But sigsuspend should return only on signal
1531 (p->p_sysent->sv_set_syscall_retval)(td, EINTR);
1532 for (has_sig = 0; !has_sig;) {
1533 while (msleep(&p->p_sigacts, &p->p_mtx, PPAUSE|PCATCH, "pause",
1536 thread_suspend_check(0);
1537 mtx_lock(&p->p_sigacts->ps_mtx);
1538 while ((sig = cursig(td)) != 0) {
1539 KASSERT(sig >= 0, ("sig %d", sig));
1540 has_sig += postsig(sig);
1542 mtx_unlock(&p->p_sigacts->ps_mtx);
1545 td->td_errno = EINTR;
1546 td->td_pflags |= TDP_NERRNO;
1547 return (EJUSTRETURN);
1550 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1552 * Compatibility sigsuspend call for old binaries. Note nonstandard calling
1553 * convention: libc stub passes mask, not pointer, to save a copyin.
1555 #ifndef _SYS_SYSPROTO_H_
1556 struct osigsuspend_args {
1562 osigsuspend(struct thread *td, struct osigsuspend_args *uap)
1566 OSIG2SIG(uap->mask, mask);
1567 return (kern_sigsuspend(td, mask));
1569 #endif /* COMPAT_43 */
1571 #if defined(COMPAT_43)
1572 #ifndef _SYS_SYSPROTO_H_
1573 struct osigstack_args {
1574 struct sigstack *nss;
1575 struct sigstack *oss;
1580 osigstack(struct thread *td, struct osigstack_args *uap)
1582 struct sigstack nss, oss;
1585 if (uap->nss != NULL) {
1586 error = copyin(uap->nss, &nss, sizeof(nss));
1590 oss.ss_sp = td->td_sigstk.ss_sp;
1591 oss.ss_onstack = sigonstack(cpu_getstack(td));
1592 if (uap->nss != NULL) {
1593 td->td_sigstk.ss_sp = nss.ss_sp;
1594 td->td_sigstk.ss_size = 0;
1595 td->td_sigstk.ss_flags |= nss.ss_onstack & SS_ONSTACK;
1596 td->td_pflags |= TDP_ALTSTACK;
1598 if (uap->oss != NULL)
1599 error = copyout(&oss, uap->oss, sizeof(oss));
1603 #endif /* COMPAT_43 */
1605 #ifndef _SYS_SYSPROTO_H_
1606 struct sigaltstack_args {
1613 sys_sigaltstack(struct thread *td, struct sigaltstack_args *uap)
1618 if (uap->ss != NULL) {
1619 error = copyin(uap->ss, &ss, sizeof(ss));
1623 error = kern_sigaltstack(td, (uap->ss != NULL) ? &ss : NULL,
1624 (uap->oss != NULL) ? &oss : NULL);
1627 if (uap->oss != NULL)
1628 error = copyout(&oss, uap->oss, sizeof(stack_t));
1633 kern_sigaltstack(struct thread *td, stack_t *ss, stack_t *oss)
1635 struct proc *p = td->td_proc;
1638 oonstack = sigonstack(cpu_getstack(td));
1641 *oss = td->td_sigstk;
1642 oss->ss_flags = (td->td_pflags & TDP_ALTSTACK)
1643 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
1649 if ((ss->ss_flags & ~SS_DISABLE) != 0)
1651 if (!(ss->ss_flags & SS_DISABLE)) {
1652 if (ss->ss_size < p->p_sysent->sv_minsigstksz)
1655 td->td_sigstk = *ss;
1656 td->td_pflags |= TDP_ALTSTACK;
1658 td->td_pflags &= ~TDP_ALTSTACK;
1665 * Common code for kill process group/broadcast kill.
1666 * cp is calling process.
1669 killpg1(struct thread *td, int sig, int pgid, int all, ksiginfo_t *ksi)
1681 sx_slock(&allproc_lock);
1682 FOREACH_PROC_IN_SYSTEM(p) {
1684 if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
1685 p == td->td_proc || p->p_state == PRS_NEW) {
1689 err = p_cansignal(td, p, sig);
1692 pksignal(p, sig, ksi);
1695 else if (ret == ESRCH)
1699 sx_sunlock(&allproc_lock);
1701 sx_slock(&proctree_lock);
1704 * zero pgid means send to my process group.
1706 pgrp = td->td_proc->p_pgrp;
1709 pgrp = pgfind(pgid);
1711 sx_sunlock(&proctree_lock);
1715 sx_sunlock(&proctree_lock);
1716 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
1718 if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
1719 p->p_state == PRS_NEW) {
1723 err = p_cansignal(td, p, sig);
1726 pksignal(p, sig, ksi);
1729 else if (ret == ESRCH)
1738 #ifndef _SYS_SYSPROTO_H_
1746 sys_kill(struct thread *td, struct kill_args *uap)
1753 * A process in capability mode can send signals only to himself.
1754 * The main rationale behind this is that abort(3) is implemented as
1755 * kill(getpid(), SIGABRT).
1757 if (IN_CAPABILITY_MODE(td) && uap->pid != td->td_proc->p_pid)
1760 AUDIT_ARG_SIGNUM(uap->signum);
1761 AUDIT_ARG_PID(uap->pid);
1762 if ((u_int)uap->signum > _SIG_MAXSIG)
1765 ksiginfo_init(&ksi);
1766 ksi.ksi_signo = uap->signum;
1767 ksi.ksi_code = SI_USER;
1768 ksi.ksi_pid = td->td_proc->p_pid;
1769 ksi.ksi_uid = td->td_ucred->cr_ruid;
1772 /* kill single process */
1773 if ((p = pfind(uap->pid)) == NULL) {
1774 if ((p = zpfind(uap->pid)) == NULL)
1777 AUDIT_ARG_PROCESS(p);
1778 error = p_cansignal(td, p, uap->signum);
1779 if (error == 0 && uap->signum)
1780 pksignal(p, uap->signum, &ksi);
1785 case -1: /* broadcast signal */
1786 return (killpg1(td, uap->signum, 0, 1, &ksi));
1787 case 0: /* signal own process group */
1788 return (killpg1(td, uap->signum, 0, 0, &ksi));
1789 default: /* negative explicit process group */
1790 return (killpg1(td, uap->signum, -uap->pid, 0, &ksi));
1796 sys_pdkill(struct thread *td, struct pdkill_args *uap)
1799 cap_rights_t rights;
1802 AUDIT_ARG_SIGNUM(uap->signum);
1803 AUDIT_ARG_FD(uap->fd);
1804 if ((u_int)uap->signum > _SIG_MAXSIG)
1807 error = procdesc_find(td, uap->fd,
1808 cap_rights_init(&rights, CAP_PDKILL), &p);
1811 AUDIT_ARG_PROCESS(p);
1812 error = p_cansignal(td, p, uap->signum);
1813 if (error == 0 && uap->signum)
1814 kern_psignal(p, uap->signum);
1819 #if defined(COMPAT_43)
1820 #ifndef _SYS_SYSPROTO_H_
1821 struct okillpg_args {
1828 okillpg(struct thread *td, struct okillpg_args *uap)
1832 AUDIT_ARG_SIGNUM(uap->signum);
1833 AUDIT_ARG_PID(uap->pgid);
1834 if ((u_int)uap->signum > _SIG_MAXSIG)
1837 ksiginfo_init(&ksi);
1838 ksi.ksi_signo = uap->signum;
1839 ksi.ksi_code = SI_USER;
1840 ksi.ksi_pid = td->td_proc->p_pid;
1841 ksi.ksi_uid = td->td_ucred->cr_ruid;
1842 return (killpg1(td, uap->signum, uap->pgid, 0, &ksi));
1844 #endif /* COMPAT_43 */
1846 #ifndef _SYS_SYSPROTO_H_
1847 struct sigqueue_args {
1850 /* union sigval */ void *value;
1854 sys_sigqueue(struct thread *td, struct sigqueue_args *uap)
1858 sv.sival_ptr = uap->value;
1860 return (kern_sigqueue(td, uap->pid, uap->signum, &sv));
1864 kern_sigqueue(struct thread *td, pid_t pid, int signum, union sigval *value)
1870 if ((u_int)signum > _SIG_MAXSIG)
1874 * Specification says sigqueue can only send signal to
1880 if ((p = pfind(pid)) == NULL) {
1881 if ((p = zpfind(pid)) == NULL)
1884 error = p_cansignal(td, p, signum);
1885 if (error == 0 && signum != 0) {
1886 ksiginfo_init(&ksi);
1887 ksi.ksi_flags = KSI_SIGQ;
1888 ksi.ksi_signo = signum;
1889 ksi.ksi_code = SI_QUEUE;
1890 ksi.ksi_pid = td->td_proc->p_pid;
1891 ksi.ksi_uid = td->td_ucred->cr_ruid;
1892 ksi.ksi_value = *value;
1893 error = pksignal(p, ksi.ksi_signo, &ksi);
1900 * Send a signal to a process group.
1903 gsignal(int pgid, int sig, ksiginfo_t *ksi)
1908 sx_slock(&proctree_lock);
1909 pgrp = pgfind(pgid);
1910 sx_sunlock(&proctree_lock);
1912 pgsignal(pgrp, sig, 0, ksi);
1919 * Send a signal to a process group. If checktty is 1,
1920 * limit to members which have a controlling terminal.
1923 pgsignal(struct pgrp *pgrp, int sig, int checkctty, ksiginfo_t *ksi)
1928 PGRP_LOCK_ASSERT(pgrp, MA_OWNED);
1929 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
1931 if (p->p_state == PRS_NORMAL &&
1932 (checkctty == 0 || p->p_flag & P_CONTROLT))
1933 pksignal(p, sig, ksi);
1941 * Recalculate the signal mask and reset the signal disposition after
1942 * usermode frame for delivery is formed. Should be called after
1943 * mach-specific routine, because sysent->sv_sendsig() needs correct
1944 * ps_siginfo and signal mask.
1947 postsig_done(int sig, struct thread *td, struct sigacts *ps)
1951 mtx_assert(&ps->ps_mtx, MA_OWNED);
1952 td->td_ru.ru_nsignals++;
1953 mask = ps->ps_catchmask[_SIG_IDX(sig)];
1954 if (!SIGISMEMBER(ps->ps_signodefer, sig))
1955 SIGADDSET(mask, sig);
1956 kern_sigprocmask(td, SIG_BLOCK, &mask, NULL,
1957 SIGPROCMASK_PROC_LOCKED | SIGPROCMASK_PS_LOCKED);
1958 if (SIGISMEMBER(ps->ps_sigreset, sig))
1964 * Send a signal caused by a trap to the current thread. If it will be
1965 * caught immediately, deliver it with correct code. Otherwise, post it
1969 trapsignal(struct thread *td, ksiginfo_t *ksi)
1977 sig = ksi->ksi_signo;
1978 code = ksi->ksi_code;
1979 KASSERT(_SIG_VALID(sig), ("invalid signal"));
1983 mtx_lock(&ps->ps_mtx);
1984 if ((p->p_flag & P_TRACED) == 0 && SIGISMEMBER(ps->ps_sigcatch, sig) &&
1985 !SIGISMEMBER(td->td_sigmask, sig)) {
1987 if (KTRPOINT(curthread, KTR_PSIG))
1988 ktrpsig(sig, ps->ps_sigact[_SIG_IDX(sig)],
1989 &td->td_sigmask, code);
1991 (*p->p_sysent->sv_sendsig)(ps->ps_sigact[_SIG_IDX(sig)],
1992 ksi, &td->td_sigmask);
1993 postsig_done(sig, td, ps);
1994 mtx_unlock(&ps->ps_mtx);
1997 * Avoid a possible infinite loop if the thread
1998 * masking the signal or process is ignoring the
2001 if (kern_forcesigexit &&
2002 (SIGISMEMBER(td->td_sigmask, sig) ||
2003 ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN)) {
2004 SIGDELSET(td->td_sigmask, sig);
2005 SIGDELSET(ps->ps_sigcatch, sig);
2006 SIGDELSET(ps->ps_sigignore, sig);
2007 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
2009 mtx_unlock(&ps->ps_mtx);
2010 p->p_code = code; /* XXX for core dump/debugger */
2011 p->p_sig = sig; /* XXX to verify code */
2012 tdsendsignal(p, td, sig, ksi);
2017 static struct thread *
2018 sigtd(struct proc *p, int sig, int prop)
2020 struct thread *td, *signal_td;
2022 PROC_LOCK_ASSERT(p, MA_OWNED);
2025 * Check if current thread can handle the signal without
2026 * switching context to another thread.
2028 if (curproc == p && !SIGISMEMBER(curthread->td_sigmask, sig))
2031 FOREACH_THREAD_IN_PROC(p, td) {
2032 if (!SIGISMEMBER(td->td_sigmask, sig)) {
2037 if (signal_td == NULL)
2038 signal_td = FIRST_THREAD_IN_PROC(p);
2043 * Send the signal to the process. If the signal has an action, the action
2044 * is usually performed by the target process rather than the caller; we add
2045 * the signal to the set of pending signals for the process.
2048 * o When a stop signal is sent to a sleeping process that takes the
2049 * default action, the process is stopped without awakening it.
2050 * o SIGCONT restarts stopped processes (or puts them back to sleep)
2051 * regardless of the signal action (eg, blocked or ignored).
2053 * Other ignored signals are discarded immediately.
2055 * NB: This function may be entered from the debugger via the "kill" DDB
2056 * command. There is little that can be done to mitigate the possibly messy
2057 * side effects of this unwise possibility.
2060 kern_psignal(struct proc *p, int sig)
2064 ksiginfo_init(&ksi);
2065 ksi.ksi_signo = sig;
2066 ksi.ksi_code = SI_KERNEL;
2067 (void) tdsendsignal(p, NULL, sig, &ksi);
2071 pksignal(struct proc *p, int sig, ksiginfo_t *ksi)
2074 return (tdsendsignal(p, NULL, sig, ksi));
2077 /* Utility function for finding a thread to send signal event to. */
2079 sigev_findtd(struct proc *p ,struct sigevent *sigev, struct thread **ttd)
2083 if (sigev->sigev_notify == SIGEV_THREAD_ID) {
2084 td = tdfind(sigev->sigev_notify_thread_id, p->p_pid);
2096 tdsignal(struct thread *td, int sig)
2100 ksiginfo_init(&ksi);
2101 ksi.ksi_signo = sig;
2102 ksi.ksi_code = SI_KERNEL;
2103 (void) tdsendsignal(td->td_proc, td, sig, &ksi);
2107 tdksignal(struct thread *td, int sig, ksiginfo_t *ksi)
2110 (void) tdsendsignal(td->td_proc, td, sig, ksi);
2114 tdsendsignal(struct proc *p, struct thread *td, int sig, ksiginfo_t *ksi)
2117 sigqueue_t *sigqueue;
2124 MPASS(td == NULL || p == td->td_proc);
2125 PROC_LOCK_ASSERT(p, MA_OWNED);
2127 if (!_SIG_VALID(sig))
2128 panic("%s(): invalid signal %d", __func__, sig);
2130 KASSERT(ksi == NULL || !KSI_ONQ(ksi), ("%s: ksi on queue", __func__));
2133 * IEEE Std 1003.1-2001: return success when killing a zombie.
2135 if (p->p_state == PRS_ZOMBIE) {
2136 if (ksi && (ksi->ksi_flags & KSI_INS))
2137 ksiginfo_tryfree(ksi);
2142 KNOTE_LOCKED(p->p_klist, NOTE_SIGNAL | sig);
2143 prop = sigprop(sig);
2146 td = sigtd(p, sig, prop);
2147 sigqueue = &p->p_sigqueue;
2149 sigqueue = &td->td_sigqueue;
2151 SDT_PROBE3(proc, , , signal__send, td, p, sig);
2154 * If the signal is being ignored,
2155 * then we forget about it immediately.
2156 * (Note: we don't set SIGCONT in ps_sigignore,
2157 * and if it is set to SIG_IGN,
2158 * action will be SIG_DFL here.)
2160 mtx_lock(&ps->ps_mtx);
2161 if (SIGISMEMBER(ps->ps_sigignore, sig)) {
2162 SDT_PROBE3(proc, , , signal__discard, td, p, sig);
2164 mtx_unlock(&ps->ps_mtx);
2165 if (ksi && (ksi->ksi_flags & KSI_INS))
2166 ksiginfo_tryfree(ksi);
2169 if (SIGISMEMBER(td->td_sigmask, sig))
2171 else if (SIGISMEMBER(ps->ps_sigcatch, sig))
2175 if (SIGISMEMBER(ps->ps_sigintr, sig))
2179 mtx_unlock(&ps->ps_mtx);
2182 sigqueue_delete_stopmask_proc(p);
2183 else if (prop & SA_STOP) {
2185 * If sending a tty stop signal to a member of an orphaned
2186 * process group, discard the signal here if the action
2187 * is default; don't stop the process below if sleeping,
2188 * and don't clear any pending SIGCONT.
2190 if ((prop & SA_TTYSTOP) &&
2191 (p->p_pgrp->pg_jobc == 0) &&
2192 (action == SIG_DFL)) {
2193 if (ksi && (ksi->ksi_flags & KSI_INS))
2194 ksiginfo_tryfree(ksi);
2197 sigqueue_delete_proc(p, SIGCONT);
2198 if (p->p_flag & P_CONTINUED) {
2199 p->p_flag &= ~P_CONTINUED;
2200 PROC_LOCK(p->p_pptr);
2201 sigqueue_take(p->p_ksi);
2202 PROC_UNLOCK(p->p_pptr);
2206 ret = sigqueue_add(sigqueue, sig, ksi);
2211 * Defer further processing for signals which are held,
2212 * except that stopped processes must be continued by SIGCONT.
2214 if (action == SIG_HOLD &&
2215 !((prop & SA_CONT) && (p->p_flag & P_STOPPED_SIG)))
2218 /* SIGKILL: Remove procfs STOPEVENTs. */
2219 if (sig == SIGKILL) {
2220 /* from procfs_ioctl.c: PIOCBIC */
2222 /* from procfs_ioctl.c: PIOCCONT */
2227 * Some signals have a process-wide effect and a per-thread
2228 * component. Most processing occurs when the process next
2229 * tries to cross the user boundary, however there are some
2230 * times when processing needs to be done immediately, such as
2231 * waking up threads so that they can cross the user boundary.
2232 * We try to do the per-process part here.
2234 if (P_SHOULDSTOP(p)) {
2235 KASSERT(!(p->p_flag & P_WEXIT),
2236 ("signal to stopped but exiting process"));
2237 if (sig == SIGKILL) {
2239 * If traced process is already stopped,
2240 * then no further action is necessary.
2242 if (p->p_flag & P_TRACED)
2245 * SIGKILL sets process running.
2246 * It will die elsewhere.
2247 * All threads must be restarted.
2249 p->p_flag &= ~P_STOPPED_SIG;
2253 if (prop & SA_CONT) {
2255 * If traced process is already stopped,
2256 * then no further action is necessary.
2258 if (p->p_flag & P_TRACED)
2261 * If SIGCONT is default (or ignored), we continue the
2262 * process but don't leave the signal in sigqueue as
2263 * it has no further action. If SIGCONT is held, we
2264 * continue the process and leave the signal in
2265 * sigqueue. If the process catches SIGCONT, let it
2266 * handle the signal itself. If it isn't waiting on
2267 * an event, it goes back to run state.
2268 * Otherwise, process goes back to sleep state.
2270 p->p_flag &= ~P_STOPPED_SIG;
2272 if (p->p_numthreads == p->p_suspcount) {
2274 p->p_flag |= P_CONTINUED;
2275 p->p_xsig = SIGCONT;
2276 PROC_LOCK(p->p_pptr);
2277 childproc_continued(p);
2278 PROC_UNLOCK(p->p_pptr);
2281 if (action == SIG_DFL) {
2282 thread_unsuspend(p);
2284 sigqueue_delete(sigqueue, sig);
2287 if (action == SIG_CATCH) {
2289 * The process wants to catch it so it needs
2290 * to run at least one thread, but which one?
2296 * The signal is not ignored or caught.
2298 thread_unsuspend(p);
2303 if (prop & SA_STOP) {
2305 * If traced process is already stopped,
2306 * then no further action is necessary.
2308 if (p->p_flag & P_TRACED)
2311 * Already stopped, don't need to stop again
2312 * (If we did the shell could get confused).
2313 * Just make sure the signal STOP bit set.
2315 p->p_flag |= P_STOPPED_SIG;
2316 sigqueue_delete(sigqueue, sig);
2321 * All other kinds of signals:
2322 * If a thread is sleeping interruptibly, simulate a
2323 * wakeup so that when it is continued it will be made
2324 * runnable and can look at the signal. However, don't make
2325 * the PROCESS runnable, leave it stopped.
2326 * It may run a bit until it hits a thread_suspend_check().
2331 if (TD_ON_SLEEPQ(td) && (td->td_flags & TDF_SINTR))
2332 wakeup_swapper = sleepq_abort(td, intrval);
2339 * Mutexes are short lived. Threads waiting on them will
2340 * hit thread_suspend_check() soon.
2342 } else if (p->p_state == PRS_NORMAL) {
2343 if (p->p_flag & P_TRACED || action == SIG_CATCH) {
2344 tdsigwakeup(td, sig, action, intrval);
2348 MPASS(action == SIG_DFL);
2350 if (prop & SA_STOP) {
2351 if (p->p_flag & (P_PPWAIT|P_WEXIT))
2353 p->p_flag |= P_STOPPED_SIG;
2356 wakeup_swapper = sig_suspend_threads(td, p, 1);
2357 if (p->p_numthreads == p->p_suspcount) {
2359 * only thread sending signal to another
2360 * process can reach here, if thread is sending
2361 * signal to its process, because thread does
2362 * not suspend itself here, p_numthreads
2363 * should never be equal to p_suspcount.
2367 sigqueue_delete_proc(p, p->p_xsig);
2375 /* Not in "NORMAL" state. discard the signal. */
2376 sigqueue_delete(sigqueue, sig);
2381 * The process is not stopped so we need to apply the signal to all the
2385 tdsigwakeup(td, sig, action, intrval);
2387 thread_unsuspend(p);
2390 /* If we jump here, proc slock should not be owned. */
2391 PROC_SLOCK_ASSERT(p, MA_NOTOWNED);
2396 * The force of a signal has been directed against a single
2397 * thread. We need to see what we can do about knocking it
2398 * out of any sleep it may be in etc.
2401 tdsigwakeup(struct thread *td, int sig, sig_t action, int intrval)
2403 struct proc *p = td->td_proc;
2408 PROC_LOCK_ASSERT(p, MA_OWNED);
2409 prop = sigprop(sig);
2414 * Bring the priority of a thread up if we want it to get
2415 * killed in this lifetime. Be careful to avoid bumping the
2416 * priority of the idle thread, since we still allow to signal
2419 if (action == SIG_DFL && (prop & SA_KILL) != 0 &&
2420 td->td_priority > PUSER && !TD_IS_IDLETHREAD(td))
2421 sched_prio(td, PUSER);
2422 if (TD_ON_SLEEPQ(td)) {
2424 * If thread is sleeping uninterruptibly
2425 * we can't interrupt the sleep... the signal will
2426 * be noticed when the process returns through
2427 * trap() or syscall().
2429 if ((td->td_flags & TDF_SINTR) == 0)
2432 * If SIGCONT is default (or ignored) and process is
2433 * asleep, we are finished; the process should not
2436 if ((prop & SA_CONT) && action == SIG_DFL) {
2439 sigqueue_delete(&p->p_sigqueue, sig);
2441 * It may be on either list in this state.
2442 * Remove from both for now.
2444 sigqueue_delete(&td->td_sigqueue, sig);
2449 * Don't awaken a sleeping thread for SIGSTOP if the
2450 * STOP signal is deferred.
2452 if ((prop & SA_STOP) != 0 && (td->td_flags & (TDF_SBDRY |
2453 TDF_SERESTART | TDF_SEINTR)) == TDF_SBDRY)
2457 * Give low priority threads a better chance to run.
2459 if (td->td_priority > PUSER && !TD_IS_IDLETHREAD(td))
2460 sched_prio(td, PUSER);
2462 wakeup_swapper = sleepq_abort(td, intrval);
2465 * Other states do nothing with the signal immediately,
2466 * other than kicking ourselves if we are running.
2467 * It will either never be noticed, or noticed very soon.
2470 if (TD_IS_RUNNING(td) && td != curthread)
2482 sig_suspend_threads(struct thread *td, struct proc *p, int sending)
2487 PROC_LOCK_ASSERT(p, MA_OWNED);
2488 PROC_SLOCK_ASSERT(p, MA_OWNED);
2489 MPASS(sending || td == curthread);
2492 FOREACH_THREAD_IN_PROC(p, td2) {
2494 td2->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
2495 if ((TD_IS_SLEEPING(td2) || TD_IS_SWAPPED(td2)) &&
2496 (td2->td_flags & TDF_SINTR)) {
2497 if (td2->td_flags & TDF_SBDRY) {
2499 * Once a thread is asleep with
2500 * TDF_SBDRY and without TDF_SERESTART
2501 * or TDF_SEINTR set, it should never
2502 * become suspended due to this check.
2504 KASSERT(!TD_IS_SUSPENDED(td2),
2505 ("thread with deferred stops suspended"));
2506 if (TD_SBDRY_INTR(td2))
2507 wakeup_swapper |= sleepq_abort(td2,
2508 TD_SBDRY_ERRNO(td2));
2509 } else if (!TD_IS_SUSPENDED(td2)) {
2510 thread_suspend_one(td2);
2512 } else if (!TD_IS_SUSPENDED(td2)) {
2513 if (sending || td != td2)
2514 td2->td_flags |= TDF_ASTPENDING;
2516 if (TD_IS_RUNNING(td2) && td2 != td)
2517 forward_signal(td2);
2522 return (wakeup_swapper);
2526 * Stop the process for an event deemed interesting to the debugger. If si is
2527 * non-NULL, this is a signal exchange; the new signal requested by the
2528 * debugger will be returned for handling. If si is NULL, this is some other
2529 * type of interesting event. The debugger may request a signal be delivered in
2530 * that case as well, however it will be deferred until it can be handled.
2533 ptracestop(struct thread *td, int sig, ksiginfo_t *si)
2535 struct proc *p = td->td_proc;
2540 PROC_LOCK_ASSERT(p, MA_OWNED);
2541 KASSERT(!(p->p_flag & P_WEXIT), ("Stopping exiting process"));
2542 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK,
2543 &p->p_mtx.lock_object, "Stopping for traced signal");
2547 if (si == NULL || (si->ksi_flags & KSI_PTRACE) == 0) {
2548 td->td_dbgflags |= TDB_XSIG;
2549 CTR4(KTR_PTRACE, "ptracestop: tid %d (pid %d) flags %#x sig %d",
2550 td->td_tid, p->p_pid, td->td_dbgflags, sig);
2552 while ((p->p_flag & P_TRACED) && (td->td_dbgflags & TDB_XSIG)) {
2555 * Ensure that, if we've been PT_KILLed, the
2556 * exit status reflects that. Another thread
2557 * may also be in ptracestop(), having just
2558 * received the SIGKILL, but this thread was
2559 * unsuspended first.
2561 td->td_dbgflags &= ~TDB_XSIG;
2562 td->td_xsig = SIGKILL;
2566 if (p->p_flag & P_SINGLE_EXIT &&
2567 !(td->td_dbgflags & TDB_EXIT)) {
2569 * Ignore ptrace stops except for thread exit
2570 * events when the process exits.
2572 td->td_dbgflags &= ~TDB_XSIG;
2578 * Make wait(2) work. Ensure that right after the
2579 * attach, the thread which was decided to become the
2580 * leader of attach gets reported to the waiter.
2581 * Otherwise, just avoid overwriting another thread's
2582 * assignment to p_xthread. If another thread has
2583 * already set p_xthread, the current thread will get
2584 * a chance to report itself upon the next iteration.
2586 if ((td->td_dbgflags & TDB_FSTP) != 0 ||
2587 ((p->p_flag2 & P2_PTRACE_FSTP) == 0 &&
2588 p->p_xthread == NULL)) {
2591 td->td_dbgflags &= ~TDB_FSTP;
2592 p->p_flag2 &= ~P2_PTRACE_FSTP;
2593 p->p_flag |= P_STOPPED_SIG | P_STOPPED_TRACE;
2594 sig_suspend_threads(td, p, 0);
2596 if ((td->td_dbgflags & TDB_STOPATFORK) != 0) {
2597 td->td_dbgflags &= ~TDB_STOPATFORK;
2600 thread_suspend_switch(td, p);
2601 if (p->p_xthread == td)
2602 p->p_xthread = NULL;
2603 if (!(p->p_flag & P_TRACED))
2605 if (td->td_dbgflags & TDB_SUSPEND) {
2606 if (p->p_flag & P_SINGLE_EXIT)
2614 if (si != NULL && sig == td->td_xsig) {
2615 /* Parent wants us to take the original signal unchanged. */
2616 si->ksi_flags |= KSI_HEAD;
2617 if (sigqueue_add(&td->td_sigqueue, sig, si) != 0)
2619 } else if (td->td_xsig != 0) {
2621 * If parent wants us to take a new signal, then it will leave
2622 * it in td->td_xsig; otherwise we just look for signals again.
2624 ksiginfo_init(&ksi);
2625 ksi.ksi_signo = td->td_xsig;
2626 ksi.ksi_flags |= KSI_PTRACE;
2627 prop = sigprop(td->td_xsig);
2628 td2 = sigtd(p, td->td_xsig, prop);
2629 tdsendsignal(p, td2, td->td_xsig, &ksi);
2634 return (td->td_xsig);
2638 reschedule_signals(struct proc *p, sigset_t block, int flags)
2644 PROC_LOCK_ASSERT(p, MA_OWNED);
2646 mtx_assert(&ps->ps_mtx, (flags & SIGPROCMASK_PS_LOCKED) != 0 ?
2647 MA_OWNED : MA_NOTOWNED);
2648 if (SIGISEMPTY(p->p_siglist))
2650 SIGSETAND(block, p->p_siglist);
2651 while ((sig = sig_ffs(&block)) != 0) {
2652 SIGDELSET(block, sig);
2653 td = sigtd(p, sig, 0);
2655 if (!(flags & SIGPROCMASK_PS_LOCKED))
2656 mtx_lock(&ps->ps_mtx);
2657 if (p->p_flag & P_TRACED ||
2658 (SIGISMEMBER(ps->ps_sigcatch, sig) &&
2659 !SIGISMEMBER(td->td_sigmask, sig)))
2660 tdsigwakeup(td, sig, SIG_CATCH,
2661 (SIGISMEMBER(ps->ps_sigintr, sig) ? EINTR :
2663 if (!(flags & SIGPROCMASK_PS_LOCKED))
2664 mtx_unlock(&ps->ps_mtx);
2669 tdsigcleanup(struct thread *td)
2675 PROC_LOCK_ASSERT(p, MA_OWNED);
2677 sigqueue_flush(&td->td_sigqueue);
2678 if (p->p_numthreads == 1)
2682 * Since we cannot handle signals, notify signal post code
2683 * about this by filling the sigmask.
2685 * Also, if needed, wake up thread(s) that do not block the
2686 * same signals as the exiting thread, since the thread might
2687 * have been selected for delivery and woken up.
2689 SIGFILLSET(unblocked);
2690 SIGSETNAND(unblocked, td->td_sigmask);
2691 SIGFILLSET(td->td_sigmask);
2692 reschedule_signals(p, unblocked, 0);
2697 sigdeferstop_curr_flags(int cflags)
2700 MPASS((cflags & (TDF_SEINTR | TDF_SERESTART)) == 0 ||
2701 (cflags & TDF_SBDRY) != 0);
2702 return (cflags & (TDF_SBDRY | TDF_SEINTR | TDF_SERESTART));
2706 * Defer the delivery of SIGSTOP for the current thread, according to
2707 * the requested mode. Returns previous flags, which must be restored
2708 * by sigallowstop().
2710 * TDF_SBDRY, TDF_SEINTR, and TDF_SERESTART flags are only set and
2711 * cleared by the current thread, which allow the lock-less read-only
2715 sigdeferstop_impl(int mode)
2721 cflags = sigdeferstop_curr_flags(td->td_flags);
2723 case SIGDEFERSTOP_NOP:
2726 case SIGDEFERSTOP_OFF:
2729 case SIGDEFERSTOP_SILENT:
2730 nflags = (cflags | TDF_SBDRY) & ~(TDF_SEINTR | TDF_SERESTART);
2732 case SIGDEFERSTOP_EINTR:
2733 nflags = (cflags | TDF_SBDRY | TDF_SEINTR) & ~TDF_SERESTART;
2735 case SIGDEFERSTOP_ERESTART:
2736 nflags = (cflags | TDF_SBDRY | TDF_SERESTART) & ~TDF_SEINTR;
2739 panic("sigdeferstop: invalid mode %x", mode);
2742 if (cflags == nflags)
2743 return (SIGDEFERSTOP_VAL_NCHG);
2745 td->td_flags = (td->td_flags & ~cflags) | nflags;
2751 * Restores the STOP handling mode, typically permitting the delivery
2752 * of SIGSTOP for the current thread. This does not immediately
2753 * suspend if a stop was posted. Instead, the thread will suspend
2754 * either via ast() or a subsequent interruptible sleep.
2757 sigallowstop_impl(int prev)
2762 KASSERT(prev != SIGDEFERSTOP_VAL_NCHG, ("failed sigallowstop"));
2763 KASSERT((prev & ~(TDF_SBDRY | TDF_SEINTR | TDF_SERESTART)) == 0,
2764 ("sigallowstop: incorrect previous mode %x", prev));
2766 cflags = sigdeferstop_curr_flags(td->td_flags);
2767 if (cflags != prev) {
2769 td->td_flags = (td->td_flags & ~cflags) | prev;
2775 * If the current process has received a signal (should be caught or cause
2776 * termination, should interrupt current syscall), return the signal number.
2777 * Stop signals with default action are processed immediately, then cleared;
2778 * they aren't returned. This is checked after each entry to the system for
2779 * a syscall or trap (though this can usually be done without calling issignal
2780 * by checking the pending signal masks in cursig.) The normal call
2783 * while (sig = cursig(curthread))
2787 issignal(struct thread *td)
2791 struct sigqueue *queue;
2792 sigset_t sigpending;
2793 int prop, sig, traced;
2798 mtx_assert(&ps->ps_mtx, MA_OWNED);
2799 PROC_LOCK_ASSERT(p, MA_OWNED);
2801 traced = (p->p_flag & P_TRACED) || (p->p_stops & S_SIG);
2803 sigpending = td->td_sigqueue.sq_signals;
2804 SIGSETOR(sigpending, p->p_sigqueue.sq_signals);
2805 SIGSETNAND(sigpending, td->td_sigmask);
2807 if ((p->p_flag & P_PPWAIT) != 0 || (td->td_flags &
2808 (TDF_SBDRY | TDF_SERESTART | TDF_SEINTR)) == TDF_SBDRY)
2809 SIG_STOPSIGMASK(sigpending);
2810 if (SIGISEMPTY(sigpending)) /* no signal to send */
2812 if ((p->p_flag & (P_TRACED | P_PPTRACE)) == P_TRACED &&
2813 (p->p_flag2 & P2_PTRACE_FSTP) != 0 &&
2814 SIGISMEMBER(sigpending, SIGSTOP)) {
2816 * If debugger just attached, always consume
2817 * SIGSTOP from ptrace(PT_ATTACH) first, to
2818 * execute the debugger attach ritual in
2822 td->td_dbgflags |= TDB_FSTP;
2824 sig = sig_ffs(&sigpending);
2827 if (p->p_stops & S_SIG) {
2828 mtx_unlock(&ps->ps_mtx);
2829 stopevent(p, S_SIG, sig);
2830 mtx_lock(&ps->ps_mtx);
2834 * We should see pending but ignored signals
2835 * only if P_TRACED was on when they were posted.
2837 if (SIGISMEMBER(ps->ps_sigignore, sig) && (traced == 0)) {
2838 sigqueue_delete(&td->td_sigqueue, sig);
2839 sigqueue_delete(&p->p_sigqueue, sig);
2842 if ((p->p_flag & (P_TRACED | P_PPTRACE)) == P_TRACED) {
2844 * If traced, always stop.
2845 * Remove old signal from queue before the stop.
2846 * XXX shrug off debugger, it causes siginfo to
2849 queue = &td->td_sigqueue;
2850 ksiginfo_init(&ksi);
2851 if (sigqueue_get(queue, sig, &ksi) == 0) {
2852 queue = &p->p_sigqueue;
2853 sigqueue_get(queue, sig, &ksi);
2855 td->td_si = ksi.ksi_info;
2857 mtx_unlock(&ps->ps_mtx);
2858 sig = ptracestop(td, sig, &ksi);
2859 mtx_lock(&ps->ps_mtx);
2861 td->td_si.si_signo = 0;
2864 * Keep looking if the debugger discarded or
2865 * replaced the signal.
2871 * If the signal became masked, re-queue it.
2873 if (SIGISMEMBER(td->td_sigmask, sig)) {
2874 ksi.ksi_flags |= KSI_HEAD;
2875 sigqueue_add(&p->p_sigqueue, sig, &ksi);
2880 * If the traced bit got turned off, requeue
2881 * the signal and go back up to the top to
2882 * rescan signals. This ensures that p_sig*
2883 * and p_sigact are consistent.
2885 if ((p->p_flag & P_TRACED) == 0) {
2886 ksi.ksi_flags |= KSI_HEAD;
2887 sigqueue_add(queue, sig, &ksi);
2892 prop = sigprop(sig);
2895 * Decide whether the signal should be returned.
2896 * Return the signal's number, or fall through
2897 * to clear it from the pending mask.
2899 switch ((intptr_t)p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) {
2901 case (intptr_t)SIG_DFL:
2903 * Don't take default actions on system processes.
2905 if (p->p_pid <= 1) {
2908 * Are you sure you want to ignore SIGSEGV
2911 printf("Process (pid %lu) got signal %d\n",
2912 (u_long)p->p_pid, sig);
2914 break; /* == ignore */
2917 * If there is a pending stop signal to process with
2918 * default action, stop here, then clear the signal.
2919 * Traced or exiting processes should ignore stops.
2920 * Additionally, a member of an orphaned process group
2921 * should ignore tty stops.
2923 if (prop & SA_STOP) {
2925 (P_TRACED | P_WEXIT | P_SINGLE_EXIT) ||
2926 (p->p_pgrp->pg_jobc == 0 &&
2928 break; /* == ignore */
2929 if (TD_SBDRY_INTR(td)) {
2930 KASSERT((td->td_flags & TDF_SBDRY) != 0,
2931 ("lost TDF_SBDRY"));
2934 mtx_unlock(&ps->ps_mtx);
2935 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK,
2936 &p->p_mtx.lock_object, "Catching SIGSTOP");
2937 sigqueue_delete(&td->td_sigqueue, sig);
2938 sigqueue_delete(&p->p_sigqueue, sig);
2939 p->p_flag |= P_STOPPED_SIG;
2942 sig_suspend_threads(td, p, 0);
2943 thread_suspend_switch(td, p);
2945 mtx_lock(&ps->ps_mtx);
2947 } else if (prop & SA_IGNORE) {
2949 * Except for SIGCONT, shouldn't get here.
2950 * Default action is to ignore; drop it.
2952 break; /* == ignore */
2957 case (intptr_t)SIG_IGN:
2959 * Masking above should prevent us ever trying
2960 * to take action on an ignored signal other
2961 * than SIGCONT, unless process is traced.
2963 if ((prop & SA_CONT) == 0 &&
2964 (p->p_flag & P_TRACED) == 0)
2965 printf("issignal\n");
2966 break; /* == ignore */
2970 * This signal has an action, let
2971 * postsig() process it.
2975 sigqueue_delete(&td->td_sigqueue, sig); /* take the signal! */
2976 sigqueue_delete(&p->p_sigqueue, sig);
2983 thread_stopped(struct proc *p)
2987 PROC_LOCK_ASSERT(p, MA_OWNED);
2988 PROC_SLOCK_ASSERT(p, MA_OWNED);
2992 if ((p->p_flag & P_STOPPED_SIG) && (n == p->p_numthreads)) {
2994 p->p_flag &= ~P_WAITED;
2995 PROC_LOCK(p->p_pptr);
2996 childproc_stopped(p, (p->p_flag & P_TRACED) ?
2997 CLD_TRAPPED : CLD_STOPPED);
2998 PROC_UNLOCK(p->p_pptr);
3004 * Take the action for the specified signal
3005 * from the current set of pending signals.
3015 sigset_t returnmask;
3017 KASSERT(sig != 0, ("postsig"));
3021 PROC_LOCK_ASSERT(p, MA_OWNED);
3023 mtx_assert(&ps->ps_mtx, MA_OWNED);
3024 ksiginfo_init(&ksi);
3025 if (sigqueue_get(&td->td_sigqueue, sig, &ksi) == 0 &&
3026 sigqueue_get(&p->p_sigqueue, sig, &ksi) == 0)
3028 ksi.ksi_signo = sig;
3029 if (ksi.ksi_code == SI_TIMER)
3030 itimer_accept(p, ksi.ksi_timerid, &ksi);
3031 action = ps->ps_sigact[_SIG_IDX(sig)];
3033 if (KTRPOINT(td, KTR_PSIG))
3034 ktrpsig(sig, action, td->td_pflags & TDP_OLDMASK ?
3035 &td->td_oldsigmask : &td->td_sigmask, ksi.ksi_code);
3037 if ((p->p_stops & S_SIG) != 0) {
3038 mtx_unlock(&ps->ps_mtx);
3039 stopevent(p, S_SIG, sig);
3040 mtx_lock(&ps->ps_mtx);
3043 if (action == SIG_DFL) {
3045 * Default action, where the default is to kill
3046 * the process. (Other cases were ignored above.)
3048 mtx_unlock(&ps->ps_mtx);
3049 proc_td_siginfo_capture(td, &ksi.ksi_info);
3054 * If we get here, the signal must be caught.
3056 KASSERT(action != SIG_IGN, ("postsig action %p", action));
3057 KASSERT(!SIGISMEMBER(td->td_sigmask, sig),
3058 ("postsig action: blocked sig %d", sig));
3061 * Set the new mask value and also defer further
3062 * occurrences of this signal.
3064 * Special case: user has done a sigsuspend. Here the
3065 * current mask is not of interest, but rather the
3066 * mask from before the sigsuspend is what we want
3067 * restored after the signal processing is completed.
3069 if (td->td_pflags & TDP_OLDMASK) {
3070 returnmask = td->td_oldsigmask;
3071 td->td_pflags &= ~TDP_OLDMASK;
3073 returnmask = td->td_sigmask;
3075 if (p->p_sig == sig) {
3079 (*p->p_sysent->sv_sendsig)(action, &ksi, &returnmask);
3080 postsig_done(sig, td, ps);
3086 proc_wkilled(struct proc *p)
3089 PROC_LOCK_ASSERT(p, MA_OWNED);
3090 if ((p->p_flag & P_WKILLED) == 0) {
3091 p->p_flag |= P_WKILLED;
3093 * Notify swapper that there is a process to swap in.
3094 * The notification is racy, at worst it would take 10
3095 * seconds for the swapper process to notice.
3097 if ((p->p_flag & (P_INMEM | P_SWAPPINGIN)) == 0)
3103 * Kill the current process for stated reason.
3106 killproc(struct proc *p, char *why)
3109 PROC_LOCK_ASSERT(p, MA_OWNED);
3110 CTR3(KTR_PROC, "killproc: proc %p (pid %d, %s)", p, p->p_pid,
3112 log(LOG_ERR, "pid %d (%s), jid %d, uid %d, was killed: %s\n",
3113 p->p_pid, p->p_comm, p->p_ucred->cr_prison->pr_id,
3114 p->p_ucred ? p->p_ucred->cr_uid : -1, why);
3116 kern_psignal(p, SIGKILL);
3120 * Force the current process to exit with the specified signal, dumping core
3121 * if appropriate. We bypass the normal tests for masked and caught signals,
3122 * allowing unrecoverable failures to terminate the process without changing
3123 * signal state. Mark the accounting record with the signal termination.
3124 * If dumping core, save the signal number for the debugger. Calls exit and
3128 sigexit(struct thread *td, int sig)
3130 struct proc *p = td->td_proc;
3132 PROC_LOCK_ASSERT(p, MA_OWNED);
3133 p->p_acflag |= AXSIG;
3135 * We must be single-threading to generate a core dump. This
3136 * ensures that the registers in the core file are up-to-date.
3137 * Also, the ELF dump handler assumes that the thread list doesn't
3138 * change out from under it.
3140 * XXX If another thread attempts to single-thread before us
3141 * (e.g. via fork()), we won't get a dump at all.
3143 if ((sigprop(sig) & SA_CORE) && thread_single(p, SINGLE_NO_EXIT) == 0) {
3146 * Log signals which would cause core dumps
3147 * (Log as LOG_INFO to appease those who don't want
3149 * XXX : Todo, as well as euid, write out ruid too
3150 * Note that coredump() drops proc lock.
3152 if (coredump(td) == 0)
3154 if (kern_logsigexit)
3156 "pid %d (%s), jid %d, uid %d: exited on "
3157 "signal %d%s\n", p->p_pid, p->p_comm,
3158 p->p_ucred->cr_prison->pr_id,
3159 td->td_ucred ? td->td_ucred->cr_uid : -1,
3161 sig & WCOREFLAG ? " (core dumped)" : "");
3169 * Send queued SIGCHLD to parent when child process's state
3173 sigparent(struct proc *p, int reason, int status)
3175 PROC_LOCK_ASSERT(p, MA_OWNED);
3176 PROC_LOCK_ASSERT(p->p_pptr, MA_OWNED);
3178 if (p->p_ksi != NULL) {
3179 p->p_ksi->ksi_signo = SIGCHLD;
3180 p->p_ksi->ksi_code = reason;
3181 p->p_ksi->ksi_status = status;
3182 p->p_ksi->ksi_pid = p->p_pid;
3183 p->p_ksi->ksi_uid = p->p_ucred->cr_ruid;
3184 if (KSI_ONQ(p->p_ksi))
3187 pksignal(p->p_pptr, SIGCHLD, p->p_ksi);
3191 childproc_jobstate(struct proc *p, int reason, int sig)
3195 PROC_LOCK_ASSERT(p, MA_OWNED);
3196 PROC_LOCK_ASSERT(p->p_pptr, MA_OWNED);
3199 * Wake up parent sleeping in kern_wait(), also send
3200 * SIGCHLD to parent, but SIGCHLD does not guarantee
3201 * that parent will awake, because parent may masked
3204 p->p_pptr->p_flag |= P_STATCHILD;
3207 ps = p->p_pptr->p_sigacts;
3208 mtx_lock(&ps->ps_mtx);
3209 if ((ps->ps_flag & PS_NOCLDSTOP) == 0) {
3210 mtx_unlock(&ps->ps_mtx);
3211 sigparent(p, reason, sig);
3213 mtx_unlock(&ps->ps_mtx);
3217 childproc_stopped(struct proc *p, int reason)
3220 childproc_jobstate(p, reason, p->p_xsig);
3224 childproc_continued(struct proc *p)
3226 childproc_jobstate(p, CLD_CONTINUED, SIGCONT);
3230 childproc_exited(struct proc *p)
3234 if (WCOREDUMP(p->p_xsig)) {
3235 reason = CLD_DUMPED;
3236 status = WTERMSIG(p->p_xsig);
3237 } else if (WIFSIGNALED(p->p_xsig)) {
3238 reason = CLD_KILLED;
3239 status = WTERMSIG(p->p_xsig);
3241 reason = CLD_EXITED;
3242 status = p->p_xexit;
3245 * XXX avoid calling wakeup(p->p_pptr), the work is
3248 sigparent(p, reason, status);
3252 * We only have 1 character for the core count in the format
3253 * string, so the range will be 0-9
3255 #define MAX_NUM_CORES 10
3256 static int num_cores = 5;
3259 sysctl_debug_num_cores_check (SYSCTL_HANDLER_ARGS)
3264 new_val = num_cores;
3265 error = sysctl_handle_int(oidp, &new_val, 0, req);
3266 if (error != 0 || req->newptr == NULL)
3268 if (new_val > MAX_NUM_CORES)
3269 new_val = MAX_NUM_CORES;
3272 num_cores = new_val;
3275 SYSCTL_PROC(_debug, OID_AUTO, ncores, CTLTYPE_INT|CTLFLAG_RW,
3276 0, sizeof(int), sysctl_debug_num_cores_check, "I", "");
3278 #define GZ_SUFFIX ".gz"
3281 static int compress_user_cores = 1;
3282 SYSCTL_INT(_kern, OID_AUTO, compress_user_cores, CTLFLAG_RWTUN,
3283 &compress_user_cores, 0, "Compression of user corefiles");
3285 int compress_user_cores_gzlevel = 6;
3286 SYSCTL_INT(_kern, OID_AUTO, compress_user_cores_gzlevel, CTLFLAG_RWTUN,
3287 &compress_user_cores_gzlevel, 0, "Corefile gzip compression level");
3289 static int compress_user_cores = 0;
3293 * Protect the access to corefilename[] by allproc_lock.
3295 #define corefilename_lock allproc_lock
3297 static char corefilename[MAXPATHLEN] = {"%N.core"};
3298 TUNABLE_STR("kern.corefile", corefilename, sizeof(corefilename));
3301 sysctl_kern_corefile(SYSCTL_HANDLER_ARGS)
3305 sx_xlock(&corefilename_lock);
3306 error = sysctl_handle_string(oidp, corefilename, sizeof(corefilename),
3308 sx_xunlock(&corefilename_lock);
3312 SYSCTL_PROC(_kern, OID_AUTO, corefile, CTLTYPE_STRING | CTLFLAG_RW |
3313 CTLFLAG_MPSAFE, 0, 0, sysctl_kern_corefile, "A",
3314 "Process corefile name format string");
3317 vnode_close_locked(struct thread *td, struct vnode *vp)
3321 vn_close(vp, FWRITE, td->td_ucred, td);
3325 * If the core format has a %I in it, then we need to check
3326 * for existing corefiles before defining a name.
3327 * To do this we iterate over 0..num_cores to find a
3328 * non-existing core file name to use. If all core files are
3329 * already used we choose the oldest one.
3332 corefile_open_last(struct thread *td, char *name, int indexpos,
3335 struct vnode *oldvp, *nextvp, *vp;
3337 struct nameidata nd;
3338 int error, i, flags, oflags, cmode;
3339 struct timespec lasttime;
3341 nextvp = oldvp = NULL;
3342 cmode = S_IRUSR | S_IWUSR;
3343 oflags = VN_OPEN_NOAUDIT | VN_OPEN_NAMECACHE |
3344 (capmode_coredump ? VN_OPEN_NOCAPCHECK : 0);
3346 for (i = 0; i < num_cores; i++) {
3347 flags = O_CREAT | FWRITE | O_NOFOLLOW;
3348 name[indexpos] = '0' + i;
3350 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, td);
3351 error = vn_open_cred(&nd, &flags, cmode, oflags, td->td_ucred,
3357 NDFREE(&nd, NDF_ONLY_PNBUF);
3358 if ((flags & O_CREAT) == O_CREAT) {
3363 error = VOP_GETATTR(vp, &vattr, td->td_ucred);
3365 vnode_close_locked(td, vp);
3369 if (oldvp == NULL ||
3370 lasttime.tv_sec > vattr.va_mtime.tv_sec ||
3371 (lasttime.tv_sec == vattr.va_mtime.tv_sec &&
3372 lasttime.tv_nsec >= vattr.va_mtime.tv_nsec)) {
3374 vnode_close_locked(td, oldvp);
3376 lasttime = vattr.va_mtime;
3378 vnode_close_locked(td, vp);
3382 if (oldvp != NULL) {
3386 vnode_close_locked(td, oldvp);
3390 vnode_close_locked(td, oldvp);
3399 * corefile_open(comm, uid, pid, td, compress, vpp, namep)
3400 * Expand the name described in corefilename, using name, uid, and pid
3401 * and open/create core file.
3402 * corefilename is a printf-like string, with three format specifiers:
3403 * %N name of process ("name")
3404 * %P process id (pid)
3406 * For example, "%N.core" is the default; they can be disabled completely
3407 * by using "/dev/null", or all core files can be stored in "/cores/%U/%N-%P".
3408 * This is controlled by the sysctl variable kern.corefile (see above).
3411 corefile_open(const char *comm, uid_t uid, pid_t pid, struct thread *td,
3412 int compress, struct vnode **vpp, char **namep)
3415 struct nameidata nd;
3417 char *hostname, *name;
3418 int cmode, error, flags, i, indexpos, oflags;
3421 format = corefilename;
3422 name = malloc(MAXPATHLEN, M_TEMP, M_WAITOK | M_ZERO);
3424 (void)sbuf_new(&sb, name, MAXPATHLEN, SBUF_FIXEDLEN);
3425 sx_slock(&corefilename_lock);
3426 for (i = 0; format[i] != '\0'; i++) {
3427 switch (format[i]) {
3428 case '%': /* Format character */
3430 switch (format[i]) {
3432 sbuf_putc(&sb, '%');
3434 case 'H': /* hostname */
3435 if (hostname == NULL) {
3436 hostname = malloc(MAXHOSTNAMELEN,
3439 getcredhostname(td->td_ucred, hostname,
3441 sbuf_printf(&sb, "%s", hostname);
3443 case 'I': /* autoincrementing index */
3444 sbuf_printf(&sb, "0");
3445 indexpos = sbuf_len(&sb) - 1;
3447 case 'N': /* process name */
3448 sbuf_printf(&sb, "%s", comm);
3450 case 'P': /* process id */
3451 sbuf_printf(&sb, "%u", pid);
3453 case 'U': /* user id */
3454 sbuf_printf(&sb, "%u", uid);
3458 "Unknown format character %c in "
3459 "corename `%s'\n", format[i], format);
3464 sbuf_putc(&sb, format[i]);
3468 sx_sunlock(&corefilename_lock);
3469 free(hostname, M_TEMP);
3471 sbuf_printf(&sb, GZ_SUFFIX);
3472 if (sbuf_error(&sb) != 0) {
3473 log(LOG_ERR, "pid %ld (%s), uid (%lu): corename is too "
3474 "long\n", (long)pid, comm, (u_long)uid);
3482 if (indexpos != -1) {
3483 error = corefile_open_last(td, name, indexpos, vpp);
3486 "pid %d (%s), uid (%u): Path `%s' failed "
3487 "on initial open test, error = %d\n",
3488 pid, comm, uid, name, error);
3491 cmode = S_IRUSR | S_IWUSR;
3492 oflags = VN_OPEN_NOAUDIT | VN_OPEN_NAMECACHE |
3493 (capmode_coredump ? VN_OPEN_NOCAPCHECK : 0);
3494 flags = O_CREAT | FWRITE | O_NOFOLLOW;
3496 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, td);
3497 error = vn_open_cred(&nd, &flags, cmode, oflags, td->td_ucred,
3501 NDFREE(&nd, NDF_ONLY_PNBUF);
3507 audit_proc_coredump(td, name, error);
3517 coredump_sanitise_path(const char *path)
3522 * Only send a subset of ASCII to devd(8) because it
3523 * might pass these strings to sh -c.
3525 for (i = 0; path[i]; i++)
3526 if (!(isalpha(path[i]) || isdigit(path[i])) &&
3527 path[i] != '/' && path[i] != '.' &&
3535 * Dump a process' core. The main routine does some
3536 * policy checking, and creates the name of the coredump;
3537 * then it passes on a vnode and a size limit to the process-specific
3538 * coredump routine if there is one; if there _is not_ one, it returns
3539 * ENOSYS; otherwise it returns the error from the process-specific routine.
3543 coredump(struct thread *td)
3545 struct proc *p = td->td_proc;
3546 struct ucred *cred = td->td_ucred;
3550 int error, error1, locked;
3551 char *name; /* name of corefile */
3555 char *fullpath, *freepath = NULL;
3557 static const char comm_name[] = "comm=";
3558 static const char core_name[] = "core=";
3560 PROC_LOCK_ASSERT(p, MA_OWNED);
3561 MPASS((p->p_flag & P_HADTHREADS) == 0 || p->p_singlethread == td);
3562 _STOPEVENT(p, S_CORE, 0);
3564 if (!do_coredump || (!sugid_coredump && (p->p_flag & P_SUGID) != 0) ||
3565 (p->p_flag2 & P2_NOTRACE) != 0) {
3571 * Note that the bulk of limit checking is done after
3572 * the corefile is created. The exception is if the limit
3573 * for corefiles is 0, in which case we don't bother
3574 * creating the corefile at all. This layout means that
3575 * a corefile is truncated instead of not being created,
3576 * if it is larger than the limit.
3578 limit = (off_t)lim_cur(td, RLIMIT_CORE);
3579 if (limit == 0 || racct_get_available(p, RACCT_CORE) == 0) {
3585 error = corefile_open(p->p_comm, cred->cr_uid, p->p_pid, td,
3586 compress_user_cores, &vp, &name);
3591 * Don't dump to non-regular files or files with links.
3592 * Do not dump into system files.
3594 if (vp->v_type != VREG || VOP_GETATTR(vp, &vattr, cred) != 0 ||
3595 vattr.va_nlink != 1 || (vp->v_vflag & VV_SYSTEM) != 0) {
3603 /* Postpone other writers, including core dumps of other processes. */
3604 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
3606 lf.l_whence = SEEK_SET;
3609 lf.l_type = F_WRLCK;
3610 locked = (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &lf, F_FLOCK) == 0);
3614 if (set_core_nodump_flag)
3615 vattr.va_flags = UF_NODUMP;
3616 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3617 VOP_SETATTR(vp, &vattr, cred);
3620 p->p_acflag |= ACORE;
3623 if (p->p_sysent->sv_coredump != NULL) {
3624 error = p->p_sysent->sv_coredump(td, vp, limit,
3625 compress_user_cores ? IMGACT_CORE_COMPRESS : 0);
3631 lf.l_type = F_UNLCK;
3632 VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK);
3634 vn_rangelock_unlock(vp, rl_cookie);
3637 * Notify the userland helper that a process triggered a core dump.
3638 * This allows the helper to run an automated debugging session.
3640 if (error != 0 || coredump_devctl == 0)
3642 len = MAXPATHLEN * 2 + sizeof(comm_name) - 1 +
3643 sizeof(' ') + sizeof(core_name) - 1;
3644 data = malloc(len, M_TEMP, M_WAITOK);
3645 if (vn_fullpath_global(td, p->p_textvp, &fullpath, &freepath) != 0)
3647 if (!coredump_sanitise_path(fullpath))
3649 snprintf(data, len, "%s%s ", comm_name, fullpath);
3650 free(freepath, M_TEMP);
3652 if (vn_fullpath_global(td, vp, &fullpath, &freepath) != 0)
3654 if (!coredump_sanitise_path(fullpath))
3656 strlcat(data, core_name, len);
3657 strlcat(data, fullpath, len);
3658 devctl_notify("kernel", "signal", "coredump", data);
3660 error1 = vn_close(vp, FWRITE, cred, td);
3664 audit_proc_coredump(td, name, error);
3666 free(freepath, M_TEMP);
3673 * Nonexistent system call-- signal process (may want to handle it). Flag
3674 * error in case process won't see signal immediately (blocked or ignored).
3676 #ifndef _SYS_SYSPROTO_H_
3683 nosys(struct thread *td, struct nosys_args *args)
3690 tdsignal(td, SIGSYS);
3692 if (kern_lognosys == 1 || kern_lognosys == 3) {
3693 uprintf("pid %d comm %s: nosys %d\n", p->p_pid, p->p_comm,
3696 if (kern_lognosys == 2 || kern_lognosys == 3) {
3697 printf("pid %d comm %s: nosys %d\n", p->p_pid, p->p_comm,
3704 * Send a SIGIO or SIGURG signal to a process or process group using stored
3705 * credentials rather than those of the current process.
3708 pgsigio(struct sigio **sigiop, int sig, int checkctty)
3711 struct sigio *sigio;
3713 ksiginfo_init(&ksi);
3714 ksi.ksi_signo = sig;
3715 ksi.ksi_code = SI_KERNEL;
3719 if (sigio == NULL) {
3723 if (sigio->sio_pgid > 0) {
3724 PROC_LOCK(sigio->sio_proc);
3725 if (CANSIGIO(sigio->sio_ucred, sigio->sio_proc->p_ucred))
3726 kern_psignal(sigio->sio_proc, sig);
3727 PROC_UNLOCK(sigio->sio_proc);
3728 } else if (sigio->sio_pgid < 0) {
3731 PGRP_LOCK(sigio->sio_pgrp);
3732 LIST_FOREACH(p, &sigio->sio_pgrp->pg_members, p_pglist) {
3734 if (p->p_state == PRS_NORMAL &&
3735 CANSIGIO(sigio->sio_ucred, p->p_ucred) &&
3736 (checkctty == 0 || (p->p_flag & P_CONTROLT)))
3737 kern_psignal(p, sig);
3740 PGRP_UNLOCK(sigio->sio_pgrp);
3746 filt_sigattach(struct knote *kn)
3748 struct proc *p = curproc;
3750 kn->kn_ptr.p_proc = p;
3751 kn->kn_flags |= EV_CLEAR; /* automatically set */
3753 knlist_add(p->p_klist, kn, 0);
3759 filt_sigdetach(struct knote *kn)
3761 struct proc *p = kn->kn_ptr.p_proc;
3763 knlist_remove(p->p_klist, kn, 0);
3767 * signal knotes are shared with proc knotes, so we apply a mask to
3768 * the hint in order to differentiate them from process hints. This
3769 * could be avoided by using a signal-specific knote list, but probably
3770 * isn't worth the trouble.
3773 filt_signal(struct knote *kn, long hint)
3776 if (hint & NOTE_SIGNAL) {
3777 hint &= ~NOTE_SIGNAL;
3779 if (kn->kn_id == hint)
3782 return (kn->kn_data != 0);
3790 ps = malloc(sizeof(struct sigacts), M_SUBPROC, M_WAITOK | M_ZERO);
3791 refcount_init(&ps->ps_refcnt, 1);
3792 mtx_init(&ps->ps_mtx, "sigacts", NULL, MTX_DEF);
3797 sigacts_free(struct sigacts *ps)
3800 if (refcount_release(&ps->ps_refcnt) == 0)
3802 mtx_destroy(&ps->ps_mtx);
3803 free(ps, M_SUBPROC);
3807 sigacts_hold(struct sigacts *ps)
3810 refcount_acquire(&ps->ps_refcnt);
3815 sigacts_copy(struct sigacts *dest, struct sigacts *src)
3818 KASSERT(dest->ps_refcnt == 1, ("sigacts_copy to shared dest"));
3819 mtx_lock(&src->ps_mtx);
3820 bcopy(src, dest, offsetof(struct sigacts, ps_refcnt));
3821 mtx_unlock(&src->ps_mtx);
3825 sigacts_shared(struct sigacts *ps)
3828 return (ps->ps_refcnt > 1);