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.
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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
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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
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22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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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 sigonstack(size_t sp)
623 struct thread *td = curthread;
625 return ((td->td_pflags & TDP_ALTSTACK) ?
626 #if defined(COMPAT_43)
627 ((td->td_sigstk.ss_size == 0) ?
628 (td->td_sigstk.ss_flags & SS_ONSTACK) :
629 ((sp - (size_t)td->td_sigstk.ss_sp) < td->td_sigstk.ss_size))
631 ((sp - (size_t)td->td_sigstk.ss_sp) < td->td_sigstk.ss_size)
640 if (sig > 0 && sig < NSIG)
641 return (sigproptbl[_SIG_IDX(sig)]);
646 sig_ffs(sigset_t *set)
650 for (i = 0; i < _SIG_WORDS; i++)
652 return (ffs(set->__bits[i]) + (i * 32));
657 sigact_flag_test(const struct sigaction *act, int flag)
661 * SA_SIGINFO is reset when signal disposition is set to
662 * ignore or default. Other flags are kept according to user
665 return ((act->sa_flags & flag) != 0 && (flag != SA_SIGINFO ||
666 ((__sighandler_t *)act->sa_sigaction != SIG_IGN &&
667 (__sighandler_t *)act->sa_sigaction != SIG_DFL)));
677 kern_sigaction(struct thread *td, int sig, const struct sigaction *act,
678 struct sigaction *oact, int flags)
681 struct proc *p = td->td_proc;
683 if (!_SIG_VALID(sig))
685 if (act != NULL && act->sa_handler != SIG_DFL &&
686 act->sa_handler != SIG_IGN && (act->sa_flags & ~(SA_ONSTACK |
687 SA_RESTART | SA_RESETHAND | SA_NOCLDSTOP | SA_NODEFER |
688 SA_NOCLDWAIT | SA_SIGINFO)) != 0)
693 mtx_lock(&ps->ps_mtx);
695 memset(oact, 0, sizeof(*oact));
696 oact->sa_mask = ps->ps_catchmask[_SIG_IDX(sig)];
697 if (SIGISMEMBER(ps->ps_sigonstack, sig))
698 oact->sa_flags |= SA_ONSTACK;
699 if (!SIGISMEMBER(ps->ps_sigintr, sig))
700 oact->sa_flags |= SA_RESTART;
701 if (SIGISMEMBER(ps->ps_sigreset, sig))
702 oact->sa_flags |= SA_RESETHAND;
703 if (SIGISMEMBER(ps->ps_signodefer, sig))
704 oact->sa_flags |= SA_NODEFER;
705 if (SIGISMEMBER(ps->ps_siginfo, sig)) {
706 oact->sa_flags |= SA_SIGINFO;
708 (__siginfohandler_t *)ps->ps_sigact[_SIG_IDX(sig)];
710 oact->sa_handler = ps->ps_sigact[_SIG_IDX(sig)];
711 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDSTOP)
712 oact->sa_flags |= SA_NOCLDSTOP;
713 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDWAIT)
714 oact->sa_flags |= SA_NOCLDWAIT;
717 if ((sig == SIGKILL || sig == SIGSTOP) &&
718 act->sa_handler != SIG_DFL) {
719 mtx_unlock(&ps->ps_mtx);
725 * Change setting atomically.
728 ps->ps_catchmask[_SIG_IDX(sig)] = act->sa_mask;
729 SIG_CANTMASK(ps->ps_catchmask[_SIG_IDX(sig)]);
730 if (sigact_flag_test(act, SA_SIGINFO)) {
731 ps->ps_sigact[_SIG_IDX(sig)] =
732 (__sighandler_t *)act->sa_sigaction;
733 SIGADDSET(ps->ps_siginfo, sig);
735 ps->ps_sigact[_SIG_IDX(sig)] = act->sa_handler;
736 SIGDELSET(ps->ps_siginfo, sig);
738 if (!sigact_flag_test(act, SA_RESTART))
739 SIGADDSET(ps->ps_sigintr, sig);
741 SIGDELSET(ps->ps_sigintr, sig);
742 if (sigact_flag_test(act, SA_ONSTACK))
743 SIGADDSET(ps->ps_sigonstack, sig);
745 SIGDELSET(ps->ps_sigonstack, sig);
746 if (sigact_flag_test(act, SA_RESETHAND))
747 SIGADDSET(ps->ps_sigreset, sig);
749 SIGDELSET(ps->ps_sigreset, sig);
750 if (sigact_flag_test(act, SA_NODEFER))
751 SIGADDSET(ps->ps_signodefer, sig);
753 SIGDELSET(ps->ps_signodefer, sig);
754 if (sig == SIGCHLD) {
755 if (act->sa_flags & SA_NOCLDSTOP)
756 ps->ps_flag |= PS_NOCLDSTOP;
758 ps->ps_flag &= ~PS_NOCLDSTOP;
759 if (act->sa_flags & SA_NOCLDWAIT) {
761 * Paranoia: since SA_NOCLDWAIT is implemented
762 * by reparenting the dying child to PID 1 (and
763 * trust it to reap the zombie), PID 1 itself
764 * is forbidden to set SA_NOCLDWAIT.
767 ps->ps_flag &= ~PS_NOCLDWAIT;
769 ps->ps_flag |= PS_NOCLDWAIT;
771 ps->ps_flag &= ~PS_NOCLDWAIT;
772 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN)
773 ps->ps_flag |= PS_CLDSIGIGN;
775 ps->ps_flag &= ~PS_CLDSIGIGN;
778 * Set bit in ps_sigignore for signals that are set to SIG_IGN,
779 * and for signals set to SIG_DFL where the default is to
780 * ignore. However, don't put SIGCONT in ps_sigignore, as we
781 * have to restart the process.
783 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
784 (sigprop(sig) & SA_IGNORE &&
785 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)) {
786 /* never to be seen again */
787 sigqueue_delete_proc(p, sig);
789 /* easier in psignal */
790 SIGADDSET(ps->ps_sigignore, sig);
791 SIGDELSET(ps->ps_sigcatch, sig);
793 SIGDELSET(ps->ps_sigignore, sig);
794 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)
795 SIGDELSET(ps->ps_sigcatch, sig);
797 SIGADDSET(ps->ps_sigcatch, sig);
799 #ifdef COMPAT_FREEBSD4
800 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
801 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL ||
802 (flags & KSA_FREEBSD4) == 0)
803 SIGDELSET(ps->ps_freebsd4, sig);
805 SIGADDSET(ps->ps_freebsd4, sig);
808 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
809 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL ||
810 (flags & KSA_OSIGSET) == 0)
811 SIGDELSET(ps->ps_osigset, sig);
813 SIGADDSET(ps->ps_osigset, sig);
816 mtx_unlock(&ps->ps_mtx);
821 #ifndef _SYS_SYSPROTO_H_
822 struct sigaction_args {
824 struct sigaction *act;
825 struct sigaction *oact;
829 sys_sigaction(struct thread *td, struct sigaction_args *uap)
831 struct sigaction act, oact;
832 struct sigaction *actp, *oactp;
835 actp = (uap->act != NULL) ? &act : NULL;
836 oactp = (uap->oact != NULL) ? &oact : NULL;
838 error = copyin(uap->act, actp, sizeof(act));
842 error = kern_sigaction(td, uap->sig, actp, oactp, 0);
844 error = copyout(oactp, uap->oact, sizeof(oact));
848 #ifdef COMPAT_FREEBSD4
849 #ifndef _SYS_SYSPROTO_H_
850 struct freebsd4_sigaction_args {
852 struct sigaction *act;
853 struct sigaction *oact;
857 freebsd4_sigaction(struct thread *td, struct freebsd4_sigaction_args *uap)
859 struct sigaction act, oact;
860 struct sigaction *actp, *oactp;
864 actp = (uap->act != NULL) ? &act : NULL;
865 oactp = (uap->oact != NULL) ? &oact : NULL;
867 error = copyin(uap->act, actp, sizeof(act));
871 error = kern_sigaction(td, uap->sig, actp, oactp, KSA_FREEBSD4);
873 error = copyout(oactp, uap->oact, sizeof(oact));
876 #endif /* COMAPT_FREEBSD4 */
878 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
879 #ifndef _SYS_SYSPROTO_H_
880 struct osigaction_args {
882 struct osigaction *nsa;
883 struct osigaction *osa;
887 osigaction(struct thread *td, struct osigaction_args *uap)
889 struct osigaction sa;
890 struct sigaction nsa, osa;
891 struct sigaction *nsap, *osap;
894 if (uap->signum <= 0 || uap->signum >= ONSIG)
897 nsap = (uap->nsa != NULL) ? &nsa : NULL;
898 osap = (uap->osa != NULL) ? &osa : NULL;
901 error = copyin(uap->nsa, &sa, sizeof(sa));
904 nsap->sa_handler = sa.sa_handler;
905 nsap->sa_flags = sa.sa_flags;
906 OSIG2SIG(sa.sa_mask, nsap->sa_mask);
908 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET);
909 if (osap && !error) {
910 sa.sa_handler = osap->sa_handler;
911 sa.sa_flags = osap->sa_flags;
912 SIG2OSIG(osap->sa_mask, sa.sa_mask);
913 error = copyout(&sa, uap->osa, sizeof(sa));
918 #if !defined(__i386__)
919 /* Avoid replicating the same stub everywhere */
921 osigreturn(struct thread *td, struct osigreturn_args *uap)
924 return (nosys(td, (struct nosys_args *)uap));
927 #endif /* COMPAT_43 */
930 * Initialize signal state for process 0;
931 * set to ignore signals that are ignored by default.
934 siginit(struct proc *p)
941 mtx_lock(&ps->ps_mtx);
942 for (i = 1; i <= NSIG; i++) {
943 if (sigprop(i) & SA_IGNORE && i != SIGCONT) {
944 SIGADDSET(ps->ps_sigignore, i);
947 mtx_unlock(&ps->ps_mtx);
952 * Reset specified signal to the default disposition.
955 sigdflt(struct sigacts *ps, int sig)
958 mtx_assert(&ps->ps_mtx, MA_OWNED);
959 SIGDELSET(ps->ps_sigcatch, sig);
960 if ((sigprop(sig) & SA_IGNORE) != 0 && sig != SIGCONT)
961 SIGADDSET(ps->ps_sigignore, sig);
962 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
963 SIGDELSET(ps->ps_siginfo, sig);
967 * Reset signals for an exec of the specified process.
970 execsigs(struct proc *p)
978 * Reset caught signals. Held signals remain held
979 * through td_sigmask (unless they were caught,
980 * and are now ignored by default).
982 PROC_LOCK_ASSERT(p, MA_OWNED);
984 mtx_lock(&ps->ps_mtx);
985 while (SIGNOTEMPTY(ps->ps_sigcatch)) {
986 sig = sig_ffs(&ps->ps_sigcatch);
988 if ((sigprop(sig) & SA_IGNORE) != 0)
989 sigqueue_delete_proc(p, sig);
993 * As CloudABI processes cannot modify signal handlers, fully
994 * reset all signals to their default behavior. Do ignore
995 * SIGPIPE, as it would otherwise be impossible to recover from
996 * writes to broken pipes and sockets.
998 if (SV_PROC_ABI(p) == SV_ABI_CLOUDABI) {
999 osigignore = ps->ps_sigignore;
1000 while (SIGNOTEMPTY(osigignore)) {
1001 sig = sig_ffs(&osigignore);
1002 SIGDELSET(osigignore, sig);
1006 SIGADDSET(ps->ps_sigignore, SIGPIPE);
1010 * Reset stack state to the user stack.
1011 * Clear set of signals caught on the signal stack.
1014 MPASS(td->td_proc == p);
1015 td->td_sigstk.ss_flags = SS_DISABLE;
1016 td->td_sigstk.ss_size = 0;
1017 td->td_sigstk.ss_sp = 0;
1018 td->td_pflags &= ~TDP_ALTSTACK;
1020 * Reset no zombies if child dies flag as Solaris does.
1022 ps->ps_flag &= ~(PS_NOCLDWAIT | PS_CLDSIGIGN);
1023 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN)
1024 ps->ps_sigact[_SIG_IDX(SIGCHLD)] = SIG_DFL;
1025 mtx_unlock(&ps->ps_mtx);
1029 * kern_sigprocmask()
1031 * Manipulate signal mask.
1034 kern_sigprocmask(struct thread *td, int how, sigset_t *set, sigset_t *oset,
1037 sigset_t new_block, oset1;
1042 if ((flags & SIGPROCMASK_PROC_LOCKED) != 0)
1043 PROC_LOCK_ASSERT(p, MA_OWNED);
1046 mtx_assert(&p->p_sigacts->ps_mtx, (flags & SIGPROCMASK_PS_LOCKED) != 0
1047 ? MA_OWNED : MA_NOTOWNED);
1049 *oset = td->td_sigmask;
1056 oset1 = td->td_sigmask;
1057 SIGSETOR(td->td_sigmask, *set);
1058 new_block = td->td_sigmask;
1059 SIGSETNAND(new_block, oset1);
1062 SIGSETNAND(td->td_sigmask, *set);
1067 oset1 = td->td_sigmask;
1068 if (flags & SIGPROCMASK_OLD)
1069 SIGSETLO(td->td_sigmask, *set);
1071 td->td_sigmask = *set;
1072 new_block = td->td_sigmask;
1073 SIGSETNAND(new_block, oset1);
1082 * The new_block set contains signals that were not previously
1083 * blocked, but are blocked now.
1085 * In case we block any signal that was not previously blocked
1086 * for td, and process has the signal pending, try to schedule
1087 * signal delivery to some thread that does not block the
1088 * signal, possibly waking it up.
1090 if (p->p_numthreads != 1)
1091 reschedule_signals(p, new_block, flags);
1095 if (!(flags & SIGPROCMASK_PROC_LOCKED))
1100 #ifndef _SYS_SYSPROTO_H_
1101 struct sigprocmask_args {
1103 const sigset_t *set;
1108 sys_sigprocmask(struct thread *td, struct sigprocmask_args *uap)
1111 sigset_t *setp, *osetp;
1114 setp = (uap->set != NULL) ? &set : NULL;
1115 osetp = (uap->oset != NULL) ? &oset : NULL;
1117 error = copyin(uap->set, setp, sizeof(set));
1121 error = kern_sigprocmask(td, uap->how, setp, osetp, 0);
1122 if (osetp && !error) {
1123 error = copyout(osetp, uap->oset, sizeof(oset));
1128 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1129 #ifndef _SYS_SYSPROTO_H_
1130 struct osigprocmask_args {
1136 osigprocmask(struct thread *td, struct osigprocmask_args *uap)
1141 OSIG2SIG(uap->mask, set);
1142 error = kern_sigprocmask(td, uap->how, &set, &oset, 1);
1143 SIG2OSIG(oset, td->td_retval[0]);
1146 #endif /* COMPAT_43 */
1149 sys_sigwait(struct thread *td, struct sigwait_args *uap)
1155 error = copyin(uap->set, &set, sizeof(set));
1157 td->td_retval[0] = error;
1161 error = kern_sigtimedwait(td, set, &ksi, NULL);
1163 if (error == EINTR && td->td_proc->p_osrel < P_OSREL_SIGWAIT)
1165 if (error == ERESTART)
1167 td->td_retval[0] = error;
1171 error = copyout(&ksi.ksi_signo, uap->sig, sizeof(ksi.ksi_signo));
1172 td->td_retval[0] = error;
1177 sys_sigtimedwait(struct thread *td, struct sigtimedwait_args *uap)
1180 struct timespec *timeout;
1186 error = copyin(uap->timeout, &ts, sizeof(ts));
1194 error = copyin(uap->set, &set, sizeof(set));
1198 error = kern_sigtimedwait(td, set, &ksi, timeout);
1203 error = copyout(&ksi.ksi_info, uap->info, sizeof(siginfo_t));
1206 td->td_retval[0] = ksi.ksi_signo;
1211 sys_sigwaitinfo(struct thread *td, struct sigwaitinfo_args *uap)
1217 error = copyin(uap->set, &set, sizeof(set));
1221 error = kern_sigtimedwait(td, set, &ksi, NULL);
1226 error = copyout(&ksi.ksi_info, uap->info, sizeof(siginfo_t));
1229 td->td_retval[0] = ksi.ksi_signo;
1234 proc_td_siginfo_capture(struct thread *td, siginfo_t *si)
1238 FOREACH_THREAD_IN_PROC(td->td_proc, thr) {
1242 thr->td_si.si_signo = 0;
1247 kern_sigtimedwait(struct thread *td, sigset_t waitset, ksiginfo_t *ksi,
1248 struct timespec *timeout)
1251 sigset_t saved_mask, new_block;
1253 int error, sig, timo, timevalid = 0;
1254 struct timespec rts, ets, ts;
1262 if (timeout != NULL) {
1263 if (timeout->tv_nsec >= 0 && timeout->tv_nsec < 1000000000) {
1265 getnanouptime(&rts);
1267 timespecadd(&ets, timeout);
1271 /* Some signals can not be waited for. */
1272 SIG_CANTMASK(waitset);
1275 saved_mask = td->td_sigmask;
1276 SIGSETNAND(td->td_sigmask, waitset);
1278 mtx_lock(&ps->ps_mtx);
1280 mtx_unlock(&ps->ps_mtx);
1281 KASSERT(sig >= 0, ("sig %d", sig));
1282 if (sig != 0 && SIGISMEMBER(waitset, sig)) {
1283 if (sigqueue_get(&td->td_sigqueue, sig, ksi) != 0 ||
1284 sigqueue_get(&p->p_sigqueue, sig, ksi) != 0) {
1294 * POSIX says this must be checked after looking for pending
1297 if (timeout != NULL) {
1302 getnanouptime(&rts);
1303 if (timespeccmp(&rts, &ets, >=)) {
1308 timespecsub(&ts, &rts);
1309 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1315 error = msleep(ps, &p->p_mtx, PPAUSE|PCATCH, "sigwait", timo);
1317 if (timeout != NULL) {
1318 if (error == ERESTART) {
1319 /* Timeout can not be restarted. */
1321 } else if (error == EAGAIN) {
1322 /* We will calculate timeout by ourself. */
1328 new_block = saved_mask;
1329 SIGSETNAND(new_block, td->td_sigmask);
1330 td->td_sigmask = saved_mask;
1332 * Fewer signals can be delivered to us, reschedule signal
1335 if (p->p_numthreads != 1)
1336 reschedule_signals(p, new_block, 0);
1339 SDT_PROBE2(proc, , , signal__clear, sig, ksi);
1341 if (ksi->ksi_code == SI_TIMER)
1342 itimer_accept(p, ksi->ksi_timerid, ksi);
1345 if (KTRPOINT(td, KTR_PSIG)) {
1348 mtx_lock(&ps->ps_mtx);
1349 action = ps->ps_sigact[_SIG_IDX(sig)];
1350 mtx_unlock(&ps->ps_mtx);
1351 ktrpsig(sig, action, &td->td_sigmask, ksi->ksi_code);
1354 if (sig == SIGKILL) {
1355 proc_td_siginfo_capture(td, &ksi->ksi_info);
1363 #ifndef _SYS_SYSPROTO_H_
1364 struct sigpending_args {
1369 sys_sigpending(struct thread *td, struct sigpending_args *uap)
1371 struct proc *p = td->td_proc;
1375 pending = p->p_sigqueue.sq_signals;
1376 SIGSETOR(pending, td->td_sigqueue.sq_signals);
1378 return (copyout(&pending, uap->set, sizeof(sigset_t)));
1381 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1382 #ifndef _SYS_SYSPROTO_H_
1383 struct osigpending_args {
1388 osigpending(struct thread *td, struct osigpending_args *uap)
1390 struct proc *p = td->td_proc;
1394 pending = p->p_sigqueue.sq_signals;
1395 SIGSETOR(pending, td->td_sigqueue.sq_signals);
1397 SIG2OSIG(pending, td->td_retval[0]);
1400 #endif /* COMPAT_43 */
1402 #if defined(COMPAT_43)
1404 * Generalized interface signal handler, 4.3-compatible.
1406 #ifndef _SYS_SYSPROTO_H_
1407 struct osigvec_args {
1415 osigvec(struct thread *td, struct osigvec_args *uap)
1418 struct sigaction nsa, osa;
1419 struct sigaction *nsap, *osap;
1422 if (uap->signum <= 0 || uap->signum >= ONSIG)
1424 nsap = (uap->nsv != NULL) ? &nsa : NULL;
1425 osap = (uap->osv != NULL) ? &osa : NULL;
1427 error = copyin(uap->nsv, &vec, sizeof(vec));
1430 nsap->sa_handler = vec.sv_handler;
1431 OSIG2SIG(vec.sv_mask, nsap->sa_mask);
1432 nsap->sa_flags = vec.sv_flags;
1433 nsap->sa_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */
1435 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET);
1436 if (osap && !error) {
1437 vec.sv_handler = osap->sa_handler;
1438 SIG2OSIG(osap->sa_mask, vec.sv_mask);
1439 vec.sv_flags = osap->sa_flags;
1440 vec.sv_flags &= ~SA_NOCLDWAIT;
1441 vec.sv_flags ^= SA_RESTART;
1442 error = copyout(&vec, uap->osv, sizeof(vec));
1447 #ifndef _SYS_SYSPROTO_H_
1448 struct osigblock_args {
1453 osigblock(struct thread *td, struct osigblock_args *uap)
1457 OSIG2SIG(uap->mask, set);
1458 kern_sigprocmask(td, SIG_BLOCK, &set, &oset, 0);
1459 SIG2OSIG(oset, td->td_retval[0]);
1463 #ifndef _SYS_SYSPROTO_H_
1464 struct osigsetmask_args {
1469 osigsetmask(struct thread *td, struct osigsetmask_args *uap)
1473 OSIG2SIG(uap->mask, set);
1474 kern_sigprocmask(td, SIG_SETMASK, &set, &oset, 0);
1475 SIG2OSIG(oset, td->td_retval[0]);
1478 #endif /* COMPAT_43 */
1481 * Suspend calling thread until signal, providing mask to be set in the
1484 #ifndef _SYS_SYSPROTO_H_
1485 struct sigsuspend_args {
1486 const sigset_t *sigmask;
1491 sys_sigsuspend(struct thread *td, struct sigsuspend_args *uap)
1496 error = copyin(uap->sigmask, &mask, sizeof(mask));
1499 return (kern_sigsuspend(td, mask));
1503 kern_sigsuspend(struct thread *td, sigset_t mask)
1505 struct proc *p = td->td_proc;
1509 * When returning from sigsuspend, we want
1510 * the old mask to be restored after the
1511 * signal handler has finished. Thus, we
1512 * save it here and mark the sigacts structure
1516 kern_sigprocmask(td, SIG_SETMASK, &mask, &td->td_oldsigmask,
1517 SIGPROCMASK_PROC_LOCKED);
1518 td->td_pflags |= TDP_OLDMASK;
1521 * Process signals now. Otherwise, we can get spurious wakeup
1522 * due to signal entered process queue, but delivered to other
1523 * thread. But sigsuspend should return only on signal
1526 (p->p_sysent->sv_set_syscall_retval)(td, EINTR);
1527 for (has_sig = 0; !has_sig;) {
1528 while (msleep(&p->p_sigacts, &p->p_mtx, PPAUSE|PCATCH, "pause",
1531 thread_suspend_check(0);
1532 mtx_lock(&p->p_sigacts->ps_mtx);
1533 while ((sig = cursig(td)) != 0) {
1534 KASSERT(sig >= 0, ("sig %d", sig));
1535 has_sig += postsig(sig);
1537 mtx_unlock(&p->p_sigacts->ps_mtx);
1540 td->td_errno = EINTR;
1541 td->td_pflags |= TDP_NERRNO;
1542 return (EJUSTRETURN);
1545 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1547 * Compatibility sigsuspend call for old binaries. Note nonstandard calling
1548 * convention: libc stub passes mask, not pointer, to save a copyin.
1550 #ifndef _SYS_SYSPROTO_H_
1551 struct osigsuspend_args {
1557 osigsuspend(struct thread *td, struct osigsuspend_args *uap)
1561 OSIG2SIG(uap->mask, mask);
1562 return (kern_sigsuspend(td, mask));
1564 #endif /* COMPAT_43 */
1566 #if defined(COMPAT_43)
1567 #ifndef _SYS_SYSPROTO_H_
1568 struct osigstack_args {
1569 struct sigstack *nss;
1570 struct sigstack *oss;
1575 osigstack(struct thread *td, struct osigstack_args *uap)
1577 struct sigstack nss, oss;
1580 if (uap->nss != NULL) {
1581 error = copyin(uap->nss, &nss, sizeof(nss));
1585 oss.ss_sp = td->td_sigstk.ss_sp;
1586 oss.ss_onstack = sigonstack(cpu_getstack(td));
1587 if (uap->nss != NULL) {
1588 td->td_sigstk.ss_sp = nss.ss_sp;
1589 td->td_sigstk.ss_size = 0;
1590 td->td_sigstk.ss_flags |= nss.ss_onstack & SS_ONSTACK;
1591 td->td_pflags |= TDP_ALTSTACK;
1593 if (uap->oss != NULL)
1594 error = copyout(&oss, uap->oss, sizeof(oss));
1598 #endif /* COMPAT_43 */
1600 #ifndef _SYS_SYSPROTO_H_
1601 struct sigaltstack_args {
1608 sys_sigaltstack(struct thread *td, struct sigaltstack_args *uap)
1613 if (uap->ss != NULL) {
1614 error = copyin(uap->ss, &ss, sizeof(ss));
1618 error = kern_sigaltstack(td, (uap->ss != NULL) ? &ss : NULL,
1619 (uap->oss != NULL) ? &oss : NULL);
1622 if (uap->oss != NULL)
1623 error = copyout(&oss, uap->oss, sizeof(stack_t));
1628 kern_sigaltstack(struct thread *td, stack_t *ss, stack_t *oss)
1630 struct proc *p = td->td_proc;
1633 oonstack = sigonstack(cpu_getstack(td));
1636 *oss = td->td_sigstk;
1637 oss->ss_flags = (td->td_pflags & TDP_ALTSTACK)
1638 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
1644 if ((ss->ss_flags & ~SS_DISABLE) != 0)
1646 if (!(ss->ss_flags & SS_DISABLE)) {
1647 if (ss->ss_size < p->p_sysent->sv_minsigstksz)
1650 td->td_sigstk = *ss;
1651 td->td_pflags |= TDP_ALTSTACK;
1653 td->td_pflags &= ~TDP_ALTSTACK;
1660 * Common code for kill process group/broadcast kill.
1661 * cp is calling process.
1664 killpg1(struct thread *td, int sig, int pgid, int all, ksiginfo_t *ksi)
1676 sx_slock(&allproc_lock);
1677 FOREACH_PROC_IN_SYSTEM(p) {
1679 if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
1680 p == td->td_proc || p->p_state == PRS_NEW) {
1684 err = p_cansignal(td, p, sig);
1687 pksignal(p, sig, ksi);
1690 else if (ret == ESRCH)
1694 sx_sunlock(&allproc_lock);
1696 sx_slock(&proctree_lock);
1699 * zero pgid means send to my process group.
1701 pgrp = td->td_proc->p_pgrp;
1704 pgrp = pgfind(pgid);
1706 sx_sunlock(&proctree_lock);
1710 sx_sunlock(&proctree_lock);
1711 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
1713 if (p->p_pid <= 1 || p->p_flag & P_SYSTEM ||
1714 p->p_state == PRS_NEW) {
1718 err = p_cansignal(td, p, sig);
1721 pksignal(p, sig, ksi);
1724 else if (ret == ESRCH)
1733 #ifndef _SYS_SYSPROTO_H_
1741 sys_kill(struct thread *td, struct kill_args *uap)
1748 * A process in capability mode can send signals only to himself.
1749 * The main rationale behind this is that abort(3) is implemented as
1750 * kill(getpid(), SIGABRT).
1752 if (IN_CAPABILITY_MODE(td) && uap->pid != td->td_proc->p_pid)
1755 AUDIT_ARG_SIGNUM(uap->signum);
1756 AUDIT_ARG_PID(uap->pid);
1757 if ((u_int)uap->signum > _SIG_MAXSIG)
1760 ksiginfo_init(&ksi);
1761 ksi.ksi_signo = uap->signum;
1762 ksi.ksi_code = SI_USER;
1763 ksi.ksi_pid = td->td_proc->p_pid;
1764 ksi.ksi_uid = td->td_ucred->cr_ruid;
1767 /* kill single process */
1768 if ((p = pfind(uap->pid)) == NULL) {
1769 if ((p = zpfind(uap->pid)) == NULL)
1772 AUDIT_ARG_PROCESS(p);
1773 error = p_cansignal(td, p, uap->signum);
1774 if (error == 0 && uap->signum)
1775 pksignal(p, uap->signum, &ksi);
1780 case -1: /* broadcast signal */
1781 return (killpg1(td, uap->signum, 0, 1, &ksi));
1782 case 0: /* signal own process group */
1783 return (killpg1(td, uap->signum, 0, 0, &ksi));
1784 default: /* negative explicit process group */
1785 return (killpg1(td, uap->signum, -uap->pid, 0, &ksi));
1791 sys_pdkill(struct thread *td, struct pdkill_args *uap)
1794 cap_rights_t rights;
1797 AUDIT_ARG_SIGNUM(uap->signum);
1798 AUDIT_ARG_FD(uap->fd);
1799 if ((u_int)uap->signum > _SIG_MAXSIG)
1802 error = procdesc_find(td, uap->fd,
1803 cap_rights_init(&rights, CAP_PDKILL), &p);
1806 AUDIT_ARG_PROCESS(p);
1807 error = p_cansignal(td, p, uap->signum);
1808 if (error == 0 && uap->signum)
1809 kern_psignal(p, uap->signum);
1814 #if defined(COMPAT_43)
1815 #ifndef _SYS_SYSPROTO_H_
1816 struct okillpg_args {
1823 okillpg(struct thread *td, struct okillpg_args *uap)
1827 AUDIT_ARG_SIGNUM(uap->signum);
1828 AUDIT_ARG_PID(uap->pgid);
1829 if ((u_int)uap->signum > _SIG_MAXSIG)
1832 ksiginfo_init(&ksi);
1833 ksi.ksi_signo = uap->signum;
1834 ksi.ksi_code = SI_USER;
1835 ksi.ksi_pid = td->td_proc->p_pid;
1836 ksi.ksi_uid = td->td_ucred->cr_ruid;
1837 return (killpg1(td, uap->signum, uap->pgid, 0, &ksi));
1839 #endif /* COMPAT_43 */
1841 #ifndef _SYS_SYSPROTO_H_
1842 struct sigqueue_args {
1845 /* union sigval */ void *value;
1849 sys_sigqueue(struct thread *td, struct sigqueue_args *uap)
1853 sv.sival_ptr = uap->value;
1855 return (kern_sigqueue(td, uap->pid, uap->signum, &sv));
1859 kern_sigqueue(struct thread *td, pid_t pid, int signum, union sigval *value)
1865 if ((u_int)signum > _SIG_MAXSIG)
1869 * Specification says sigqueue can only send signal to
1875 if ((p = pfind(pid)) == NULL) {
1876 if ((p = zpfind(pid)) == NULL)
1879 error = p_cansignal(td, p, signum);
1880 if (error == 0 && signum != 0) {
1881 ksiginfo_init(&ksi);
1882 ksi.ksi_flags = KSI_SIGQ;
1883 ksi.ksi_signo = signum;
1884 ksi.ksi_code = SI_QUEUE;
1885 ksi.ksi_pid = td->td_proc->p_pid;
1886 ksi.ksi_uid = td->td_ucred->cr_ruid;
1887 ksi.ksi_value = *value;
1888 error = pksignal(p, ksi.ksi_signo, &ksi);
1895 * Send a signal to a process group.
1898 gsignal(int pgid, int sig, ksiginfo_t *ksi)
1903 sx_slock(&proctree_lock);
1904 pgrp = pgfind(pgid);
1905 sx_sunlock(&proctree_lock);
1907 pgsignal(pgrp, sig, 0, ksi);
1914 * Send a signal to a process group. If checktty is 1,
1915 * limit to members which have a controlling terminal.
1918 pgsignal(struct pgrp *pgrp, int sig, int checkctty, ksiginfo_t *ksi)
1923 PGRP_LOCK_ASSERT(pgrp, MA_OWNED);
1924 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
1926 if (p->p_state == PRS_NORMAL &&
1927 (checkctty == 0 || p->p_flag & P_CONTROLT))
1928 pksignal(p, sig, ksi);
1936 * Recalculate the signal mask and reset the signal disposition after
1937 * usermode frame for delivery is formed. Should be called after
1938 * mach-specific routine, because sysent->sv_sendsig() needs correct
1939 * ps_siginfo and signal mask.
1942 postsig_done(int sig, struct thread *td, struct sigacts *ps)
1946 mtx_assert(&ps->ps_mtx, MA_OWNED);
1947 td->td_ru.ru_nsignals++;
1948 mask = ps->ps_catchmask[_SIG_IDX(sig)];
1949 if (!SIGISMEMBER(ps->ps_signodefer, sig))
1950 SIGADDSET(mask, sig);
1951 kern_sigprocmask(td, SIG_BLOCK, &mask, NULL,
1952 SIGPROCMASK_PROC_LOCKED | SIGPROCMASK_PS_LOCKED);
1953 if (SIGISMEMBER(ps->ps_sigreset, sig))
1959 * Send a signal caused by a trap to the current thread. If it will be
1960 * caught immediately, deliver it with correct code. Otherwise, post it
1964 trapsignal(struct thread *td, ksiginfo_t *ksi)
1972 sig = ksi->ksi_signo;
1973 code = ksi->ksi_code;
1974 KASSERT(_SIG_VALID(sig), ("invalid signal"));
1978 mtx_lock(&ps->ps_mtx);
1979 if ((p->p_flag & P_TRACED) == 0 && SIGISMEMBER(ps->ps_sigcatch, sig) &&
1980 !SIGISMEMBER(td->td_sigmask, sig)) {
1982 if (KTRPOINT(curthread, KTR_PSIG))
1983 ktrpsig(sig, ps->ps_sigact[_SIG_IDX(sig)],
1984 &td->td_sigmask, code);
1986 (*p->p_sysent->sv_sendsig)(ps->ps_sigact[_SIG_IDX(sig)],
1987 ksi, &td->td_sigmask);
1988 postsig_done(sig, td, ps);
1989 mtx_unlock(&ps->ps_mtx);
1992 * Avoid a possible infinite loop if the thread
1993 * masking the signal or process is ignoring the
1996 if (kern_forcesigexit &&
1997 (SIGISMEMBER(td->td_sigmask, sig) ||
1998 ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN)) {
1999 SIGDELSET(td->td_sigmask, sig);
2000 SIGDELSET(ps->ps_sigcatch, sig);
2001 SIGDELSET(ps->ps_sigignore, sig);
2002 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
2004 mtx_unlock(&ps->ps_mtx);
2005 p->p_code = code; /* XXX for core dump/debugger */
2006 p->p_sig = sig; /* XXX to verify code */
2007 tdsendsignal(p, td, sig, ksi);
2012 static struct thread *
2013 sigtd(struct proc *p, int sig, int prop)
2015 struct thread *td, *signal_td;
2017 PROC_LOCK_ASSERT(p, MA_OWNED);
2020 * Check if current thread can handle the signal without
2021 * switching context to another thread.
2023 if (curproc == p && !SIGISMEMBER(curthread->td_sigmask, sig))
2026 FOREACH_THREAD_IN_PROC(p, td) {
2027 if (!SIGISMEMBER(td->td_sigmask, sig)) {
2032 if (signal_td == NULL)
2033 signal_td = FIRST_THREAD_IN_PROC(p);
2038 * Send the signal to the process. If the signal has an action, the action
2039 * is usually performed by the target process rather than the caller; we add
2040 * the signal to the set of pending signals for the process.
2043 * o When a stop signal is sent to a sleeping process that takes the
2044 * default action, the process is stopped without awakening it.
2045 * o SIGCONT restarts stopped processes (or puts them back to sleep)
2046 * regardless of the signal action (eg, blocked or ignored).
2048 * Other ignored signals are discarded immediately.
2050 * NB: This function may be entered from the debugger via the "kill" DDB
2051 * command. There is little that can be done to mitigate the possibly messy
2052 * side effects of this unwise possibility.
2055 kern_psignal(struct proc *p, int sig)
2059 ksiginfo_init(&ksi);
2060 ksi.ksi_signo = sig;
2061 ksi.ksi_code = SI_KERNEL;
2062 (void) tdsendsignal(p, NULL, sig, &ksi);
2066 pksignal(struct proc *p, int sig, ksiginfo_t *ksi)
2069 return (tdsendsignal(p, NULL, sig, ksi));
2072 /* Utility function for finding a thread to send signal event to. */
2074 sigev_findtd(struct proc *p ,struct sigevent *sigev, struct thread **ttd)
2078 if (sigev->sigev_notify == SIGEV_THREAD_ID) {
2079 td = tdfind(sigev->sigev_notify_thread_id, p->p_pid);
2091 tdsignal(struct thread *td, int sig)
2095 ksiginfo_init(&ksi);
2096 ksi.ksi_signo = sig;
2097 ksi.ksi_code = SI_KERNEL;
2098 (void) tdsendsignal(td->td_proc, td, sig, &ksi);
2102 tdksignal(struct thread *td, int sig, ksiginfo_t *ksi)
2105 (void) tdsendsignal(td->td_proc, td, sig, ksi);
2109 tdsendsignal(struct proc *p, struct thread *td, int sig, ksiginfo_t *ksi)
2112 sigqueue_t *sigqueue;
2119 MPASS(td == NULL || p == td->td_proc);
2120 PROC_LOCK_ASSERT(p, MA_OWNED);
2122 if (!_SIG_VALID(sig))
2123 panic("%s(): invalid signal %d", __func__, sig);
2125 KASSERT(ksi == NULL || !KSI_ONQ(ksi), ("%s: ksi on queue", __func__));
2128 * IEEE Std 1003.1-2001: return success when killing a zombie.
2130 if (p->p_state == PRS_ZOMBIE) {
2131 if (ksi && (ksi->ksi_flags & KSI_INS))
2132 ksiginfo_tryfree(ksi);
2137 KNOTE_LOCKED(p->p_klist, NOTE_SIGNAL | sig);
2138 prop = sigprop(sig);
2141 td = sigtd(p, sig, prop);
2142 sigqueue = &p->p_sigqueue;
2144 sigqueue = &td->td_sigqueue;
2146 SDT_PROBE3(proc, , , signal__send, td, p, sig);
2149 * If the signal is being ignored,
2150 * then we forget about it immediately.
2151 * (Note: we don't set SIGCONT in ps_sigignore,
2152 * and if it is set to SIG_IGN,
2153 * action will be SIG_DFL here.)
2155 mtx_lock(&ps->ps_mtx);
2156 if (SIGISMEMBER(ps->ps_sigignore, sig)) {
2157 SDT_PROBE3(proc, , , signal__discard, td, p, sig);
2159 mtx_unlock(&ps->ps_mtx);
2160 if (ksi && (ksi->ksi_flags & KSI_INS))
2161 ksiginfo_tryfree(ksi);
2164 if (SIGISMEMBER(td->td_sigmask, sig))
2166 else if (SIGISMEMBER(ps->ps_sigcatch, sig))
2170 if (SIGISMEMBER(ps->ps_sigintr, sig))
2174 mtx_unlock(&ps->ps_mtx);
2177 sigqueue_delete_stopmask_proc(p);
2178 else if (prop & SA_STOP) {
2180 * If sending a tty stop signal to a member of an orphaned
2181 * process group, discard the signal here if the action
2182 * is default; don't stop the process below if sleeping,
2183 * and don't clear any pending SIGCONT.
2185 if ((prop & SA_TTYSTOP) &&
2186 (p->p_pgrp->pg_jobc == 0) &&
2187 (action == SIG_DFL)) {
2188 if (ksi && (ksi->ksi_flags & KSI_INS))
2189 ksiginfo_tryfree(ksi);
2192 sigqueue_delete_proc(p, SIGCONT);
2193 if (p->p_flag & P_CONTINUED) {
2194 p->p_flag &= ~P_CONTINUED;
2195 PROC_LOCK(p->p_pptr);
2196 sigqueue_take(p->p_ksi);
2197 PROC_UNLOCK(p->p_pptr);
2201 ret = sigqueue_add(sigqueue, sig, ksi);
2206 * Defer further processing for signals which are held,
2207 * except that stopped processes must be continued by SIGCONT.
2209 if (action == SIG_HOLD &&
2210 !((prop & SA_CONT) && (p->p_flag & P_STOPPED_SIG)))
2213 /* SIGKILL: Remove procfs STOPEVENTs. */
2214 if (sig == SIGKILL) {
2215 /* from procfs_ioctl.c: PIOCBIC */
2217 /* from procfs_ioctl.c: PIOCCONT */
2222 * Some signals have a process-wide effect and a per-thread
2223 * component. Most processing occurs when the process next
2224 * tries to cross the user boundary, however there are some
2225 * times when processing needs to be done immediately, such as
2226 * waking up threads so that they can cross the user boundary.
2227 * We try to do the per-process part here.
2229 if (P_SHOULDSTOP(p)) {
2230 KASSERT(!(p->p_flag & P_WEXIT),
2231 ("signal to stopped but exiting process"));
2232 if (sig == SIGKILL) {
2234 * If traced process is already stopped,
2235 * then no further action is necessary.
2237 if (p->p_flag & P_TRACED)
2240 * SIGKILL sets process running.
2241 * It will die elsewhere.
2242 * All threads must be restarted.
2244 p->p_flag &= ~P_STOPPED_SIG;
2248 if (prop & SA_CONT) {
2250 * If traced process is already stopped,
2251 * then no further action is necessary.
2253 if (p->p_flag & P_TRACED)
2256 * If SIGCONT is default (or ignored), we continue the
2257 * process but don't leave the signal in sigqueue as
2258 * it has no further action. If SIGCONT is held, we
2259 * continue the process and leave the signal in
2260 * sigqueue. If the process catches SIGCONT, let it
2261 * handle the signal itself. If it isn't waiting on
2262 * an event, it goes back to run state.
2263 * Otherwise, process goes back to sleep state.
2265 p->p_flag &= ~P_STOPPED_SIG;
2267 if (p->p_numthreads == p->p_suspcount) {
2269 p->p_flag |= P_CONTINUED;
2270 p->p_xsig = SIGCONT;
2271 PROC_LOCK(p->p_pptr);
2272 childproc_continued(p);
2273 PROC_UNLOCK(p->p_pptr);
2276 if (action == SIG_DFL) {
2277 thread_unsuspend(p);
2279 sigqueue_delete(sigqueue, sig);
2282 if (action == SIG_CATCH) {
2284 * The process wants to catch it so it needs
2285 * to run at least one thread, but which one?
2291 * The signal is not ignored or caught.
2293 thread_unsuspend(p);
2298 if (prop & SA_STOP) {
2300 * If traced process is already stopped,
2301 * then no further action is necessary.
2303 if (p->p_flag & P_TRACED)
2306 * Already stopped, don't need to stop again
2307 * (If we did the shell could get confused).
2308 * Just make sure the signal STOP bit set.
2310 p->p_flag |= P_STOPPED_SIG;
2311 sigqueue_delete(sigqueue, sig);
2316 * All other kinds of signals:
2317 * If a thread is sleeping interruptibly, simulate a
2318 * wakeup so that when it is continued it will be made
2319 * runnable and can look at the signal. However, don't make
2320 * the PROCESS runnable, leave it stopped.
2321 * It may run a bit until it hits a thread_suspend_check().
2326 if (TD_ON_SLEEPQ(td) && (td->td_flags & TDF_SINTR))
2327 wakeup_swapper = sleepq_abort(td, intrval);
2334 * Mutexes are short lived. Threads waiting on them will
2335 * hit thread_suspend_check() soon.
2337 } else if (p->p_state == PRS_NORMAL) {
2338 if (p->p_flag & P_TRACED || action == SIG_CATCH) {
2339 tdsigwakeup(td, sig, action, intrval);
2343 MPASS(action == SIG_DFL);
2345 if (prop & SA_STOP) {
2346 if (p->p_flag & (P_PPWAIT|P_WEXIT))
2348 p->p_flag |= P_STOPPED_SIG;
2351 wakeup_swapper = sig_suspend_threads(td, p, 1);
2352 if (p->p_numthreads == p->p_suspcount) {
2354 * only thread sending signal to another
2355 * process can reach here, if thread is sending
2356 * signal to its process, because thread does
2357 * not suspend itself here, p_numthreads
2358 * should never be equal to p_suspcount.
2362 sigqueue_delete_proc(p, p->p_xsig);
2370 /* Not in "NORMAL" state. discard the signal. */
2371 sigqueue_delete(sigqueue, sig);
2376 * The process is not stopped so we need to apply the signal to all the
2380 tdsigwakeup(td, sig, action, intrval);
2382 thread_unsuspend(p);
2385 /* If we jump here, proc slock should not be owned. */
2386 PROC_SLOCK_ASSERT(p, MA_NOTOWNED);
2391 * The force of a signal has been directed against a single
2392 * thread. We need to see what we can do about knocking it
2393 * out of any sleep it may be in etc.
2396 tdsigwakeup(struct thread *td, int sig, sig_t action, int intrval)
2398 struct proc *p = td->td_proc;
2403 PROC_LOCK_ASSERT(p, MA_OWNED);
2404 prop = sigprop(sig);
2409 * Bring the priority of a thread up if we want it to get
2410 * killed in this lifetime. Be careful to avoid bumping the
2411 * priority of the idle thread, since we still allow to signal
2414 if (action == SIG_DFL && (prop & SA_KILL) != 0 &&
2415 td->td_priority > PUSER && !TD_IS_IDLETHREAD(td))
2416 sched_prio(td, PUSER);
2417 if (TD_ON_SLEEPQ(td)) {
2419 * If thread is sleeping uninterruptibly
2420 * we can't interrupt the sleep... the signal will
2421 * be noticed when the process returns through
2422 * trap() or syscall().
2424 if ((td->td_flags & TDF_SINTR) == 0)
2427 * If SIGCONT is default (or ignored) and process is
2428 * asleep, we are finished; the process should not
2431 if ((prop & SA_CONT) && action == SIG_DFL) {
2434 sigqueue_delete(&p->p_sigqueue, sig);
2436 * It may be on either list in this state.
2437 * Remove from both for now.
2439 sigqueue_delete(&td->td_sigqueue, sig);
2444 * Don't awaken a sleeping thread for SIGSTOP if the
2445 * STOP signal is deferred.
2447 if ((prop & SA_STOP) != 0 && (td->td_flags & (TDF_SBDRY |
2448 TDF_SERESTART | TDF_SEINTR)) == TDF_SBDRY)
2452 * Give low priority threads a better chance to run.
2454 if (td->td_priority > PUSER && !TD_IS_IDLETHREAD(td))
2455 sched_prio(td, PUSER);
2457 wakeup_swapper = sleepq_abort(td, intrval);
2460 * Other states do nothing with the signal immediately,
2461 * other than kicking ourselves if we are running.
2462 * It will either never be noticed, or noticed very soon.
2465 if (TD_IS_RUNNING(td) && td != curthread)
2477 sig_suspend_threads(struct thread *td, struct proc *p, int sending)
2482 PROC_LOCK_ASSERT(p, MA_OWNED);
2483 PROC_SLOCK_ASSERT(p, MA_OWNED);
2484 MPASS(sending || td == curthread);
2487 FOREACH_THREAD_IN_PROC(p, td2) {
2489 td2->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
2490 if ((TD_IS_SLEEPING(td2) || TD_IS_SWAPPED(td2)) &&
2491 (td2->td_flags & TDF_SINTR)) {
2492 if (td2->td_flags & TDF_SBDRY) {
2494 * Once a thread is asleep with
2495 * TDF_SBDRY and without TDF_SERESTART
2496 * or TDF_SEINTR set, it should never
2497 * become suspended due to this check.
2499 KASSERT(!TD_IS_SUSPENDED(td2),
2500 ("thread with deferred stops suspended"));
2501 if (TD_SBDRY_INTR(td2))
2502 wakeup_swapper |= sleepq_abort(td2,
2503 TD_SBDRY_ERRNO(td2));
2504 } else if (!TD_IS_SUSPENDED(td2)) {
2505 thread_suspend_one(td2);
2507 } else if (!TD_IS_SUSPENDED(td2)) {
2508 if (sending || td != td2)
2509 td2->td_flags |= TDF_ASTPENDING;
2511 if (TD_IS_RUNNING(td2) && td2 != td)
2512 forward_signal(td2);
2517 return (wakeup_swapper);
2521 * Stop the process for an event deemed interesting to the debugger. If si is
2522 * non-NULL, this is a signal exchange; the new signal requested by the
2523 * debugger will be returned for handling. If si is NULL, this is some other
2524 * type of interesting event. The debugger may request a signal be delivered in
2525 * that case as well, however it will be deferred until it can be handled.
2528 ptracestop(struct thread *td, int sig, ksiginfo_t *si)
2530 struct proc *p = td->td_proc;
2535 PROC_LOCK_ASSERT(p, MA_OWNED);
2536 KASSERT(!(p->p_flag & P_WEXIT), ("Stopping exiting process"));
2537 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK,
2538 &p->p_mtx.lock_object, "Stopping for traced signal");
2542 if (si == NULL || (si->ksi_flags & KSI_PTRACE) == 0) {
2543 td->td_dbgflags |= TDB_XSIG;
2544 CTR4(KTR_PTRACE, "ptracestop: tid %d (pid %d) flags %#x sig %d",
2545 td->td_tid, p->p_pid, td->td_dbgflags, sig);
2547 while ((p->p_flag & P_TRACED) && (td->td_dbgflags & TDB_XSIG)) {
2550 * Ensure that, if we've been PT_KILLed, the
2551 * exit status reflects that. Another thread
2552 * may also be in ptracestop(), having just
2553 * received the SIGKILL, but this thread was
2554 * unsuspended first.
2556 td->td_dbgflags &= ~TDB_XSIG;
2557 td->td_xsig = SIGKILL;
2561 if (p->p_flag & P_SINGLE_EXIT &&
2562 !(td->td_dbgflags & TDB_EXIT)) {
2564 * Ignore ptrace stops except for thread exit
2565 * events when the process exits.
2567 td->td_dbgflags &= ~TDB_XSIG;
2573 * Make wait(2) work. Ensure that right after the
2574 * attach, the thread which was decided to become the
2575 * leader of attach gets reported to the waiter.
2576 * Otherwise, just avoid overwriting another thread's
2577 * assignment to p_xthread. If another thread has
2578 * already set p_xthread, the current thread will get
2579 * a chance to report itself upon the next iteration.
2581 if ((td->td_dbgflags & TDB_FSTP) != 0 ||
2582 ((p->p_flag2 & P2_PTRACE_FSTP) == 0 &&
2583 p->p_xthread == NULL)) {
2586 td->td_dbgflags &= ~TDB_FSTP;
2587 p->p_flag2 &= ~P2_PTRACE_FSTP;
2588 p->p_flag |= P_STOPPED_SIG | P_STOPPED_TRACE;
2589 sig_suspend_threads(td, p, 0);
2591 if ((td->td_dbgflags & TDB_STOPATFORK) != 0) {
2592 td->td_dbgflags &= ~TDB_STOPATFORK;
2595 thread_suspend_switch(td, p);
2596 if (p->p_xthread == td)
2597 p->p_xthread = NULL;
2598 if (!(p->p_flag & P_TRACED))
2600 if (td->td_dbgflags & TDB_SUSPEND) {
2601 if (p->p_flag & P_SINGLE_EXIT)
2609 if (si != NULL && sig == td->td_xsig) {
2610 /* Parent wants us to take the original signal unchanged. */
2611 si->ksi_flags |= KSI_HEAD;
2612 if (sigqueue_add(&td->td_sigqueue, sig, si) != 0)
2614 } else if (td->td_xsig != 0) {
2616 * If parent wants us to take a new signal, then it will leave
2617 * it in td->td_xsig; otherwise we just look for signals again.
2619 ksiginfo_init(&ksi);
2620 ksi.ksi_signo = td->td_xsig;
2621 ksi.ksi_flags |= KSI_PTRACE;
2622 prop = sigprop(td->td_xsig);
2623 td2 = sigtd(p, td->td_xsig, prop);
2624 tdsendsignal(p, td2, td->td_xsig, &ksi);
2629 return (td->td_xsig);
2633 reschedule_signals(struct proc *p, sigset_t block, int flags)
2639 PROC_LOCK_ASSERT(p, MA_OWNED);
2641 mtx_assert(&ps->ps_mtx, (flags & SIGPROCMASK_PS_LOCKED) != 0 ?
2642 MA_OWNED : MA_NOTOWNED);
2643 if (SIGISEMPTY(p->p_siglist))
2645 SIGSETAND(block, p->p_siglist);
2646 while ((sig = sig_ffs(&block)) != 0) {
2647 SIGDELSET(block, sig);
2648 td = sigtd(p, sig, 0);
2650 if (!(flags & SIGPROCMASK_PS_LOCKED))
2651 mtx_lock(&ps->ps_mtx);
2652 if (p->p_flag & P_TRACED ||
2653 (SIGISMEMBER(ps->ps_sigcatch, sig) &&
2654 !SIGISMEMBER(td->td_sigmask, sig)))
2655 tdsigwakeup(td, sig, SIG_CATCH,
2656 (SIGISMEMBER(ps->ps_sigintr, sig) ? EINTR :
2658 if (!(flags & SIGPROCMASK_PS_LOCKED))
2659 mtx_unlock(&ps->ps_mtx);
2664 tdsigcleanup(struct thread *td)
2670 PROC_LOCK_ASSERT(p, MA_OWNED);
2672 sigqueue_flush(&td->td_sigqueue);
2673 if (p->p_numthreads == 1)
2677 * Since we cannot handle signals, notify signal post code
2678 * about this by filling the sigmask.
2680 * Also, if needed, wake up thread(s) that do not block the
2681 * same signals as the exiting thread, since the thread might
2682 * have been selected for delivery and woken up.
2684 SIGFILLSET(unblocked);
2685 SIGSETNAND(unblocked, td->td_sigmask);
2686 SIGFILLSET(td->td_sigmask);
2687 reschedule_signals(p, unblocked, 0);
2692 sigdeferstop_curr_flags(int cflags)
2695 MPASS((cflags & (TDF_SEINTR | TDF_SERESTART)) == 0 ||
2696 (cflags & TDF_SBDRY) != 0);
2697 return (cflags & (TDF_SBDRY | TDF_SEINTR | TDF_SERESTART));
2701 * Defer the delivery of SIGSTOP for the current thread, according to
2702 * the requested mode. Returns previous flags, which must be restored
2703 * by sigallowstop().
2705 * TDF_SBDRY, TDF_SEINTR, and TDF_SERESTART flags are only set and
2706 * cleared by the current thread, which allow the lock-less read-only
2710 sigdeferstop_impl(int mode)
2716 cflags = sigdeferstop_curr_flags(td->td_flags);
2718 case SIGDEFERSTOP_NOP:
2721 case SIGDEFERSTOP_OFF:
2724 case SIGDEFERSTOP_SILENT:
2725 nflags = (cflags | TDF_SBDRY) & ~(TDF_SEINTR | TDF_SERESTART);
2727 case SIGDEFERSTOP_EINTR:
2728 nflags = (cflags | TDF_SBDRY | TDF_SEINTR) & ~TDF_SERESTART;
2730 case SIGDEFERSTOP_ERESTART:
2731 nflags = (cflags | TDF_SBDRY | TDF_SERESTART) & ~TDF_SEINTR;
2734 panic("sigdeferstop: invalid mode %x", mode);
2737 if (cflags == nflags)
2738 return (SIGDEFERSTOP_VAL_NCHG);
2740 td->td_flags = (td->td_flags & ~cflags) | nflags;
2746 * Restores the STOP handling mode, typically permitting the delivery
2747 * of SIGSTOP for the current thread. This does not immediately
2748 * suspend if a stop was posted. Instead, the thread will suspend
2749 * either via ast() or a subsequent interruptible sleep.
2752 sigallowstop_impl(int prev)
2757 KASSERT(prev != SIGDEFERSTOP_VAL_NCHG, ("failed sigallowstop"));
2758 KASSERT((prev & ~(TDF_SBDRY | TDF_SEINTR | TDF_SERESTART)) == 0,
2759 ("sigallowstop: incorrect previous mode %x", prev));
2761 cflags = sigdeferstop_curr_flags(td->td_flags);
2762 if (cflags != prev) {
2764 td->td_flags = (td->td_flags & ~cflags) | prev;
2770 * If the current process has received a signal (should be caught or cause
2771 * termination, should interrupt current syscall), return the signal number.
2772 * Stop signals with default action are processed immediately, then cleared;
2773 * they aren't returned. This is checked after each entry to the system for
2774 * a syscall or trap (though this can usually be done without calling issignal
2775 * by checking the pending signal masks in cursig.) The normal call
2778 * while (sig = cursig(curthread))
2782 issignal(struct thread *td)
2786 struct sigqueue *queue;
2787 sigset_t sigpending;
2788 int prop, sig, traced;
2793 mtx_assert(&ps->ps_mtx, MA_OWNED);
2794 PROC_LOCK_ASSERT(p, MA_OWNED);
2796 traced = (p->p_flag & P_TRACED) || (p->p_stops & S_SIG);
2798 sigpending = td->td_sigqueue.sq_signals;
2799 SIGSETOR(sigpending, p->p_sigqueue.sq_signals);
2800 SIGSETNAND(sigpending, td->td_sigmask);
2802 if ((p->p_flag & P_PPWAIT) != 0 || (td->td_flags &
2803 (TDF_SBDRY | TDF_SERESTART | TDF_SEINTR)) == TDF_SBDRY)
2804 SIG_STOPSIGMASK(sigpending);
2805 if (SIGISEMPTY(sigpending)) /* no signal to send */
2807 if ((p->p_flag & (P_TRACED | P_PPTRACE)) == P_TRACED &&
2808 (p->p_flag2 & P2_PTRACE_FSTP) != 0 &&
2809 SIGISMEMBER(sigpending, SIGSTOP)) {
2811 * If debugger just attached, always consume
2812 * SIGSTOP from ptrace(PT_ATTACH) first, to
2813 * execute the debugger attach ritual in
2817 td->td_dbgflags |= TDB_FSTP;
2819 sig = sig_ffs(&sigpending);
2822 if (p->p_stops & S_SIG) {
2823 mtx_unlock(&ps->ps_mtx);
2824 stopevent(p, S_SIG, sig);
2825 mtx_lock(&ps->ps_mtx);
2829 * We should see pending but ignored signals
2830 * only if P_TRACED was on when they were posted.
2832 if (SIGISMEMBER(ps->ps_sigignore, sig) && (traced == 0)) {
2833 sigqueue_delete(&td->td_sigqueue, sig);
2834 sigqueue_delete(&p->p_sigqueue, sig);
2837 if ((p->p_flag & (P_TRACED | P_PPTRACE)) == P_TRACED) {
2839 * If traced, always stop.
2840 * Remove old signal from queue before the stop.
2841 * XXX shrug off debugger, it causes siginfo to
2844 queue = &td->td_sigqueue;
2845 ksiginfo_init(&ksi);
2846 if (sigqueue_get(queue, sig, &ksi) == 0) {
2847 queue = &p->p_sigqueue;
2848 sigqueue_get(queue, sig, &ksi);
2850 td->td_si = ksi.ksi_info;
2852 mtx_unlock(&ps->ps_mtx);
2853 sig = ptracestop(td, sig, &ksi);
2854 mtx_lock(&ps->ps_mtx);
2857 * Keep looking if the debugger discarded or
2858 * replaced the signal.
2864 * If the signal became masked, re-queue it.
2866 if (SIGISMEMBER(td->td_sigmask, sig)) {
2867 ksi.ksi_flags |= KSI_HEAD;
2868 sigqueue_add(&p->p_sigqueue, sig, &ksi);
2873 * If the traced bit got turned off, requeue
2874 * the signal and go back up to the top to
2875 * rescan signals. This ensures that p_sig*
2876 * and p_sigact are consistent.
2878 if ((p->p_flag & P_TRACED) == 0) {
2879 ksi.ksi_flags |= KSI_HEAD;
2880 sigqueue_add(queue, sig, &ksi);
2885 prop = sigprop(sig);
2888 * Decide whether the signal should be returned.
2889 * Return the signal's number, or fall through
2890 * to clear it from the pending mask.
2892 switch ((intptr_t)p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) {
2894 case (intptr_t)SIG_DFL:
2896 * Don't take default actions on system processes.
2898 if (p->p_pid <= 1) {
2901 * Are you sure you want to ignore SIGSEGV
2904 printf("Process (pid %lu) got signal %d\n",
2905 (u_long)p->p_pid, sig);
2907 break; /* == ignore */
2910 * If there is a pending stop signal to process with
2911 * default action, stop here, then clear the signal.
2912 * Traced or exiting processes should ignore stops.
2913 * Additionally, a member of an orphaned process group
2914 * should ignore tty stops.
2916 if (prop & SA_STOP) {
2918 (P_TRACED | P_WEXIT | P_SINGLE_EXIT) ||
2919 (p->p_pgrp->pg_jobc == 0 &&
2921 break; /* == ignore */
2922 if (TD_SBDRY_INTR(td)) {
2923 KASSERT((td->td_flags & TDF_SBDRY) != 0,
2924 ("lost TDF_SBDRY"));
2927 mtx_unlock(&ps->ps_mtx);
2928 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK,
2929 &p->p_mtx.lock_object, "Catching SIGSTOP");
2930 sigqueue_delete(&td->td_sigqueue, sig);
2931 sigqueue_delete(&p->p_sigqueue, sig);
2932 p->p_flag |= P_STOPPED_SIG;
2935 sig_suspend_threads(td, p, 0);
2936 thread_suspend_switch(td, p);
2938 mtx_lock(&ps->ps_mtx);
2940 } else if (prop & SA_IGNORE) {
2942 * Except for SIGCONT, shouldn't get here.
2943 * Default action is to ignore; drop it.
2945 break; /* == ignore */
2950 case (intptr_t)SIG_IGN:
2952 * Masking above should prevent us ever trying
2953 * to take action on an ignored signal other
2954 * than SIGCONT, unless process is traced.
2956 if ((prop & SA_CONT) == 0 &&
2957 (p->p_flag & P_TRACED) == 0)
2958 printf("issignal\n");
2959 break; /* == ignore */
2963 * This signal has an action, let
2964 * postsig() process it.
2968 sigqueue_delete(&td->td_sigqueue, sig); /* take the signal! */
2969 sigqueue_delete(&p->p_sigqueue, sig);
2976 thread_stopped(struct proc *p)
2980 PROC_LOCK_ASSERT(p, MA_OWNED);
2981 PROC_SLOCK_ASSERT(p, MA_OWNED);
2985 if ((p->p_flag & P_STOPPED_SIG) && (n == p->p_numthreads)) {
2987 p->p_flag &= ~P_WAITED;
2988 PROC_LOCK(p->p_pptr);
2989 childproc_stopped(p, (p->p_flag & P_TRACED) ?
2990 CLD_TRAPPED : CLD_STOPPED);
2991 PROC_UNLOCK(p->p_pptr);
2997 * Take the action for the specified signal
2998 * from the current set of pending signals.
3008 sigset_t returnmask;
3010 KASSERT(sig != 0, ("postsig"));
3014 PROC_LOCK_ASSERT(p, MA_OWNED);
3016 mtx_assert(&ps->ps_mtx, MA_OWNED);
3017 ksiginfo_init(&ksi);
3018 if (sigqueue_get(&td->td_sigqueue, sig, &ksi) == 0 &&
3019 sigqueue_get(&p->p_sigqueue, sig, &ksi) == 0)
3021 ksi.ksi_signo = sig;
3022 if (ksi.ksi_code == SI_TIMER)
3023 itimer_accept(p, ksi.ksi_timerid, &ksi);
3024 action = ps->ps_sigact[_SIG_IDX(sig)];
3026 if (KTRPOINT(td, KTR_PSIG))
3027 ktrpsig(sig, action, td->td_pflags & TDP_OLDMASK ?
3028 &td->td_oldsigmask : &td->td_sigmask, ksi.ksi_code);
3030 if ((p->p_stops & S_SIG) != 0) {
3031 mtx_unlock(&ps->ps_mtx);
3032 stopevent(p, S_SIG, sig);
3033 mtx_lock(&ps->ps_mtx);
3036 if (action == SIG_DFL) {
3038 * Default action, where the default is to kill
3039 * the process. (Other cases were ignored above.)
3041 mtx_unlock(&ps->ps_mtx);
3042 proc_td_siginfo_capture(td, &ksi.ksi_info);
3047 * If we get here, the signal must be caught.
3049 KASSERT(action != SIG_IGN, ("postsig action %p", action));
3050 KASSERT(!SIGISMEMBER(td->td_sigmask, sig),
3051 ("postsig action: blocked sig %d", sig));
3054 * Set the new mask value and also defer further
3055 * occurrences of this signal.
3057 * Special case: user has done a sigsuspend. Here the
3058 * current mask is not of interest, but rather the
3059 * mask from before the sigsuspend is what we want
3060 * restored after the signal processing is completed.
3062 if (td->td_pflags & TDP_OLDMASK) {
3063 returnmask = td->td_oldsigmask;
3064 td->td_pflags &= ~TDP_OLDMASK;
3066 returnmask = td->td_sigmask;
3068 if (p->p_sig == sig) {
3072 (*p->p_sysent->sv_sendsig)(action, &ksi, &returnmask);
3073 postsig_done(sig, td, ps);
3079 proc_wkilled(struct proc *p)
3082 PROC_LOCK_ASSERT(p, MA_OWNED);
3083 if ((p->p_flag & P_WKILLED) == 0) {
3084 p->p_flag |= P_WKILLED;
3086 * Notify swapper that there is a process to swap in.
3087 * The notification is racy, at worst it would take 10
3088 * seconds for the swapper process to notice.
3090 if ((p->p_flag & (P_INMEM | P_SWAPPINGIN)) == 0)
3096 * Kill the current process for stated reason.
3099 killproc(struct proc *p, char *why)
3102 PROC_LOCK_ASSERT(p, MA_OWNED);
3103 CTR3(KTR_PROC, "killproc: proc %p (pid %d, %s)", p, p->p_pid,
3105 log(LOG_ERR, "pid %d (%s), uid %d, was killed: %s\n", p->p_pid,
3106 p->p_comm, p->p_ucred ? p->p_ucred->cr_uid : -1, why);
3108 kern_psignal(p, SIGKILL);
3112 * Force the current process to exit with the specified signal, dumping core
3113 * if appropriate. We bypass the normal tests for masked and caught signals,
3114 * allowing unrecoverable failures to terminate the process without changing
3115 * signal state. Mark the accounting record with the signal termination.
3116 * If dumping core, save the signal number for the debugger. Calls exit and
3120 sigexit(struct thread *td, int sig)
3122 struct proc *p = td->td_proc;
3124 PROC_LOCK_ASSERT(p, MA_OWNED);
3125 p->p_acflag |= AXSIG;
3127 * We must be single-threading to generate a core dump. This
3128 * ensures that the registers in the core file are up-to-date.
3129 * Also, the ELF dump handler assumes that the thread list doesn't
3130 * change out from under it.
3132 * XXX If another thread attempts to single-thread before us
3133 * (e.g. via fork()), we won't get a dump at all.
3135 if ((sigprop(sig) & SA_CORE) && thread_single(p, SINGLE_NO_EXIT) == 0) {
3138 * Log signals which would cause core dumps
3139 * (Log as LOG_INFO to appease those who don't want
3141 * XXX : Todo, as well as euid, write out ruid too
3142 * Note that coredump() drops proc lock.
3144 if (coredump(td) == 0)
3146 if (kern_logsigexit)
3148 "pid %d (%s), uid %d: exited on signal %d%s\n",
3149 p->p_pid, p->p_comm,
3150 td->td_ucred ? td->td_ucred->cr_uid : -1,
3152 sig & WCOREFLAG ? " (core dumped)" : "");
3160 * Send queued SIGCHLD to parent when child process's state
3164 sigparent(struct proc *p, int reason, int status)
3166 PROC_LOCK_ASSERT(p, MA_OWNED);
3167 PROC_LOCK_ASSERT(p->p_pptr, MA_OWNED);
3169 if (p->p_ksi != NULL) {
3170 p->p_ksi->ksi_signo = SIGCHLD;
3171 p->p_ksi->ksi_code = reason;
3172 p->p_ksi->ksi_status = status;
3173 p->p_ksi->ksi_pid = p->p_pid;
3174 p->p_ksi->ksi_uid = p->p_ucred->cr_ruid;
3175 if (KSI_ONQ(p->p_ksi))
3178 pksignal(p->p_pptr, SIGCHLD, p->p_ksi);
3182 childproc_jobstate(struct proc *p, int reason, int sig)
3186 PROC_LOCK_ASSERT(p, MA_OWNED);
3187 PROC_LOCK_ASSERT(p->p_pptr, MA_OWNED);
3190 * Wake up parent sleeping in kern_wait(), also send
3191 * SIGCHLD to parent, but SIGCHLD does not guarantee
3192 * that parent will awake, because parent may masked
3195 p->p_pptr->p_flag |= P_STATCHILD;
3198 ps = p->p_pptr->p_sigacts;
3199 mtx_lock(&ps->ps_mtx);
3200 if ((ps->ps_flag & PS_NOCLDSTOP) == 0) {
3201 mtx_unlock(&ps->ps_mtx);
3202 sigparent(p, reason, sig);
3204 mtx_unlock(&ps->ps_mtx);
3208 childproc_stopped(struct proc *p, int reason)
3211 childproc_jobstate(p, reason, p->p_xsig);
3215 childproc_continued(struct proc *p)
3217 childproc_jobstate(p, CLD_CONTINUED, SIGCONT);
3221 childproc_exited(struct proc *p)
3225 if (WCOREDUMP(p->p_xsig)) {
3226 reason = CLD_DUMPED;
3227 status = WTERMSIG(p->p_xsig);
3228 } else if (WIFSIGNALED(p->p_xsig)) {
3229 reason = CLD_KILLED;
3230 status = WTERMSIG(p->p_xsig);
3232 reason = CLD_EXITED;
3233 status = p->p_xexit;
3236 * XXX avoid calling wakeup(p->p_pptr), the work is
3239 sigparent(p, reason, status);
3243 * We only have 1 character for the core count in the format
3244 * string, so the range will be 0-9
3246 #define MAX_NUM_CORES 10
3247 static int num_cores = 5;
3250 sysctl_debug_num_cores_check (SYSCTL_HANDLER_ARGS)
3255 new_val = num_cores;
3256 error = sysctl_handle_int(oidp, &new_val, 0, req);
3257 if (error != 0 || req->newptr == NULL)
3259 if (new_val > MAX_NUM_CORES)
3260 new_val = MAX_NUM_CORES;
3263 num_cores = new_val;
3266 SYSCTL_PROC(_debug, OID_AUTO, ncores, CTLTYPE_INT|CTLFLAG_RW,
3267 0, sizeof(int), sysctl_debug_num_cores_check, "I", "");
3269 #define GZ_SUFFIX ".gz"
3272 static int compress_user_cores = 1;
3273 SYSCTL_INT(_kern, OID_AUTO, compress_user_cores, CTLFLAG_RWTUN,
3274 &compress_user_cores, 0, "Compression of user corefiles");
3276 int compress_user_cores_gzlevel = 6;
3277 SYSCTL_INT(_kern, OID_AUTO, compress_user_cores_gzlevel, CTLFLAG_RWTUN,
3278 &compress_user_cores_gzlevel, 0, "Corefile gzip compression level");
3280 static int compress_user_cores = 0;
3284 * Protect the access to corefilename[] by allproc_lock.
3286 #define corefilename_lock allproc_lock
3288 static char corefilename[MAXPATHLEN] = {"%N.core"};
3289 TUNABLE_STR("kern.corefile", corefilename, sizeof(corefilename));
3292 sysctl_kern_corefile(SYSCTL_HANDLER_ARGS)
3296 sx_xlock(&corefilename_lock);
3297 error = sysctl_handle_string(oidp, corefilename, sizeof(corefilename),
3299 sx_xunlock(&corefilename_lock);
3303 SYSCTL_PROC(_kern, OID_AUTO, corefile, CTLTYPE_STRING | CTLFLAG_RW |
3304 CTLFLAG_MPSAFE, 0, 0, sysctl_kern_corefile, "A",
3305 "Process corefile name format string");
3308 vnode_close_locked(struct thread *td, struct vnode *vp)
3312 vn_close(vp, FWRITE, td->td_ucred, td);
3316 * If the core format has a %I in it, then we need to check
3317 * for existing corefiles before defining a name.
3318 * To do this we iterate over 0..num_cores to find a
3319 * non-existing core file name to use. If all core files are
3320 * already used we choose the oldest one.
3323 corefile_open_last(struct thread *td, char *name, int indexpos,
3326 struct vnode *oldvp, *nextvp, *vp;
3328 struct nameidata nd;
3329 int error, i, flags, oflags, cmode;
3330 struct timespec lasttime;
3332 nextvp = oldvp = NULL;
3333 cmode = S_IRUSR | S_IWUSR;
3334 oflags = VN_OPEN_NOAUDIT | VN_OPEN_NAMECACHE |
3335 (capmode_coredump ? VN_OPEN_NOCAPCHECK : 0);
3337 for (i = 0; i < num_cores; i++) {
3338 flags = O_CREAT | FWRITE | O_NOFOLLOW;
3339 name[indexpos] = '0' + i;
3341 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, td);
3342 error = vn_open_cred(&nd, &flags, cmode, oflags, td->td_ucred,
3348 NDFREE(&nd, NDF_ONLY_PNBUF);
3349 if ((flags & O_CREAT) == O_CREAT) {
3354 error = VOP_GETATTR(vp, &vattr, td->td_ucred);
3356 vnode_close_locked(td, vp);
3360 if (oldvp == NULL ||
3361 lasttime.tv_sec > vattr.va_mtime.tv_sec ||
3362 (lasttime.tv_sec == vattr.va_mtime.tv_sec &&
3363 lasttime.tv_nsec >= vattr.va_mtime.tv_nsec)) {
3365 vnode_close_locked(td, oldvp);
3367 lasttime = vattr.va_mtime;
3369 vnode_close_locked(td, vp);
3373 if (oldvp != NULL) {
3377 vnode_close_locked(td, oldvp);
3381 vnode_close_locked(td, oldvp);
3390 * corefile_open(comm, uid, pid, td, compress, vpp, namep)
3391 * Expand the name described in corefilename, using name, uid, and pid
3392 * and open/create core file.
3393 * corefilename is a printf-like string, with three format specifiers:
3394 * %N name of process ("name")
3395 * %P process id (pid)
3397 * For example, "%N.core" is the default; they can be disabled completely
3398 * by using "/dev/null", or all core files can be stored in "/cores/%U/%N-%P".
3399 * This is controlled by the sysctl variable kern.corefile (see above).
3402 corefile_open(const char *comm, uid_t uid, pid_t pid, struct thread *td,
3403 int compress, struct vnode **vpp, char **namep)
3406 struct nameidata nd;
3408 char *hostname, *name;
3409 int cmode, error, flags, i, indexpos, oflags;
3412 format = corefilename;
3413 name = malloc(MAXPATHLEN, M_TEMP, M_WAITOK | M_ZERO);
3415 (void)sbuf_new(&sb, name, MAXPATHLEN, SBUF_FIXEDLEN);
3416 sx_slock(&corefilename_lock);
3417 for (i = 0; format[i] != '\0'; i++) {
3418 switch (format[i]) {
3419 case '%': /* Format character */
3421 switch (format[i]) {
3423 sbuf_putc(&sb, '%');
3425 case 'H': /* hostname */
3426 if (hostname == NULL) {
3427 hostname = malloc(MAXHOSTNAMELEN,
3430 getcredhostname(td->td_ucred, hostname,
3432 sbuf_printf(&sb, "%s", hostname);
3434 case 'I': /* autoincrementing index */
3435 sbuf_printf(&sb, "0");
3436 indexpos = sbuf_len(&sb) - 1;
3438 case 'N': /* process name */
3439 sbuf_printf(&sb, "%s", comm);
3441 case 'P': /* process id */
3442 sbuf_printf(&sb, "%u", pid);
3444 case 'U': /* user id */
3445 sbuf_printf(&sb, "%u", uid);
3449 "Unknown format character %c in "
3450 "corename `%s'\n", format[i], format);
3455 sbuf_putc(&sb, format[i]);
3459 sx_sunlock(&corefilename_lock);
3460 free(hostname, M_TEMP);
3462 sbuf_printf(&sb, GZ_SUFFIX);
3463 if (sbuf_error(&sb) != 0) {
3464 log(LOG_ERR, "pid %ld (%s), uid (%lu): corename is too "
3465 "long\n", (long)pid, comm, (u_long)uid);
3473 if (indexpos != -1) {
3474 error = corefile_open_last(td, name, indexpos, vpp);
3477 "pid %d (%s), uid (%u): Path `%s' failed "
3478 "on initial open test, error = %d\n",
3479 pid, comm, uid, name, error);
3482 cmode = S_IRUSR | S_IWUSR;
3483 oflags = VN_OPEN_NOAUDIT | VN_OPEN_NAMECACHE |
3484 (capmode_coredump ? VN_OPEN_NOCAPCHECK : 0);
3485 flags = O_CREAT | FWRITE | O_NOFOLLOW;
3487 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, td);
3488 error = vn_open_cred(&nd, &flags, cmode, oflags, td->td_ucred,
3492 NDFREE(&nd, NDF_ONLY_PNBUF);
3498 audit_proc_coredump(td, name, error);
3508 coredump_sanitise_path(const char *path)
3513 * Only send a subset of ASCII to devd(8) because it
3514 * might pass these strings to sh -c.
3516 for (i = 0; path[i]; i++)
3517 if (!(isalpha(path[i]) || isdigit(path[i])) &&
3518 path[i] != '/' && path[i] != '.' &&
3526 * Dump a process' core. The main routine does some
3527 * policy checking, and creates the name of the coredump;
3528 * then it passes on a vnode and a size limit to the process-specific
3529 * coredump routine if there is one; if there _is not_ one, it returns
3530 * ENOSYS; otherwise it returns the error from the process-specific routine.
3534 coredump(struct thread *td)
3536 struct proc *p = td->td_proc;
3537 struct ucred *cred = td->td_ucred;
3541 int error, error1, locked;
3542 char *name; /* name of corefile */
3546 char *fullpath, *freepath = NULL;
3548 static const char comm_name[] = "comm=";
3549 static const char core_name[] = "core=";
3551 PROC_LOCK_ASSERT(p, MA_OWNED);
3552 MPASS((p->p_flag & P_HADTHREADS) == 0 || p->p_singlethread == td);
3553 _STOPEVENT(p, S_CORE, 0);
3555 if (!do_coredump || (!sugid_coredump && (p->p_flag & P_SUGID) != 0) ||
3556 (p->p_flag2 & P2_NOTRACE) != 0) {
3562 * Note that the bulk of limit checking is done after
3563 * the corefile is created. The exception is if the limit
3564 * for corefiles is 0, in which case we don't bother
3565 * creating the corefile at all. This layout means that
3566 * a corefile is truncated instead of not being created,
3567 * if it is larger than the limit.
3569 limit = (off_t)lim_cur(td, RLIMIT_CORE);
3570 if (limit == 0 || racct_get_available(p, RACCT_CORE) == 0) {
3576 error = corefile_open(p->p_comm, cred->cr_uid, p->p_pid, td,
3577 compress_user_cores, &vp, &name);
3582 * Don't dump to non-regular files or files with links.
3583 * Do not dump into system files.
3585 if (vp->v_type != VREG || VOP_GETATTR(vp, &vattr, cred) != 0 ||
3586 vattr.va_nlink != 1 || (vp->v_vflag & VV_SYSTEM) != 0) {
3594 /* Postpone other writers, including core dumps of other processes. */
3595 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
3597 lf.l_whence = SEEK_SET;
3600 lf.l_type = F_WRLCK;
3601 locked = (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &lf, F_FLOCK) == 0);
3605 if (set_core_nodump_flag)
3606 vattr.va_flags = UF_NODUMP;
3607 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3608 VOP_SETATTR(vp, &vattr, cred);
3611 p->p_acflag |= ACORE;
3614 if (p->p_sysent->sv_coredump != NULL) {
3615 error = p->p_sysent->sv_coredump(td, vp, limit,
3616 compress_user_cores ? IMGACT_CORE_COMPRESS : 0);
3622 lf.l_type = F_UNLCK;
3623 VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK);
3625 vn_rangelock_unlock(vp, rl_cookie);
3628 * Notify the userland helper that a process triggered a core dump.
3629 * This allows the helper to run an automated debugging session.
3631 if (error != 0 || coredump_devctl == 0)
3633 len = MAXPATHLEN * 2 + sizeof(comm_name) - 1 +
3634 sizeof(' ') + sizeof(core_name) - 1;
3635 data = malloc(len, M_TEMP, M_WAITOK);
3636 if (vn_fullpath_global(td, p->p_textvp, &fullpath, &freepath) != 0)
3638 if (!coredump_sanitise_path(fullpath))
3640 snprintf(data, len, "%s%s ", comm_name, fullpath);
3641 free(freepath, M_TEMP);
3643 if (vn_fullpath_global(td, vp, &fullpath, &freepath) != 0)
3645 if (!coredump_sanitise_path(fullpath))
3647 strlcat(data, core_name, len);
3648 strlcat(data, fullpath, len);
3649 devctl_notify("kernel", "signal", "coredump", data);
3651 error1 = vn_close(vp, FWRITE, cred, td);
3655 audit_proc_coredump(td, name, error);
3657 free(freepath, M_TEMP);
3664 * Nonexistent system call-- signal process (may want to handle it). Flag
3665 * error in case process won't see signal immediately (blocked or ignored).
3667 #ifndef _SYS_SYSPROTO_H_
3674 nosys(struct thread *td, struct nosys_args *args)
3681 tdsignal(td, SIGSYS);
3683 if (kern_lognosys == 1 || kern_lognosys == 3) {
3684 uprintf("pid %d comm %s: nosys %d\n", p->p_pid, p->p_comm,
3687 if (kern_lognosys == 2 || kern_lognosys == 3) {
3688 printf("pid %d comm %s: nosys %d\n", p->p_pid, p->p_comm,
3695 * Send a SIGIO or SIGURG signal to a process or process group using stored
3696 * credentials rather than those of the current process.
3699 pgsigio(struct sigio **sigiop, int sig, int checkctty)
3702 struct sigio *sigio;
3704 ksiginfo_init(&ksi);
3705 ksi.ksi_signo = sig;
3706 ksi.ksi_code = SI_KERNEL;
3710 if (sigio == NULL) {
3714 if (sigio->sio_pgid > 0) {
3715 PROC_LOCK(sigio->sio_proc);
3716 if (CANSIGIO(sigio->sio_ucred, sigio->sio_proc->p_ucred))
3717 kern_psignal(sigio->sio_proc, sig);
3718 PROC_UNLOCK(sigio->sio_proc);
3719 } else if (sigio->sio_pgid < 0) {
3722 PGRP_LOCK(sigio->sio_pgrp);
3723 LIST_FOREACH(p, &sigio->sio_pgrp->pg_members, p_pglist) {
3725 if (p->p_state == PRS_NORMAL &&
3726 CANSIGIO(sigio->sio_ucred, p->p_ucred) &&
3727 (checkctty == 0 || (p->p_flag & P_CONTROLT)))
3728 kern_psignal(p, sig);
3731 PGRP_UNLOCK(sigio->sio_pgrp);
3737 filt_sigattach(struct knote *kn)
3739 struct proc *p = curproc;
3741 kn->kn_ptr.p_proc = p;
3742 kn->kn_flags |= EV_CLEAR; /* automatically set */
3744 knlist_add(p->p_klist, kn, 0);
3750 filt_sigdetach(struct knote *kn)
3752 struct proc *p = kn->kn_ptr.p_proc;
3754 knlist_remove(p->p_klist, kn, 0);
3758 * signal knotes are shared with proc knotes, so we apply a mask to
3759 * the hint in order to differentiate them from process hints. This
3760 * could be avoided by using a signal-specific knote list, but probably
3761 * isn't worth the trouble.
3764 filt_signal(struct knote *kn, long hint)
3767 if (hint & NOTE_SIGNAL) {
3768 hint &= ~NOTE_SIGNAL;
3770 if (kn->kn_id == hint)
3773 return (kn->kn_data != 0);
3781 ps = malloc(sizeof(struct sigacts), M_SUBPROC, M_WAITOK | M_ZERO);
3782 refcount_init(&ps->ps_refcnt, 1);
3783 mtx_init(&ps->ps_mtx, "sigacts", NULL, MTX_DEF);
3788 sigacts_free(struct sigacts *ps)
3791 if (refcount_release(&ps->ps_refcnt) == 0)
3793 mtx_destroy(&ps->ps_mtx);
3794 free(ps, M_SUBPROC);
3798 sigacts_hold(struct sigacts *ps)
3801 refcount_acquire(&ps->ps_refcnt);
3806 sigacts_copy(struct sigacts *dest, struct sigacts *src)
3809 KASSERT(dest->ps_refcnt == 1, ("sigacts_copy to shared dest"));
3810 mtx_lock(&src->ps_mtx);
3811 bcopy(src, dest, offsetof(struct sigacts, ps_refcnt));
3812 mtx_unlock(&src->ps_mtx);
3816 sigacts_shared(struct sigacts *ps)
3819 return (ps->ps_refcnt > 1);