2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1986, 1989, 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
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9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
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13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
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33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)kern_sig.c 8.7 (Berkeley) 4/18/94
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
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>
50 #include <sys/capsicum.h>
51 #include <sys/compressor.h>
52 #include <sys/condvar.h>
53 #include <sys/devctl.h>
54 #include <sys/event.h>
55 #include <sys/fcntl.h>
56 #include <sys/imgact.h>
57 #include <sys/kernel.h>
59 #include <sys/ktrace.h>
60 #include <sys/limits.h>
62 #include <sys/malloc.h>
63 #include <sys/mutex.h>
64 #include <sys/refcount.h>
65 #include <sys/namei.h>
67 #include <sys/procdesc.h>
68 #include <sys/ptrace.h>
69 #include <sys/posix4.h>
70 #include <sys/racct.h>
71 #include <sys/resourcevar.h>
74 #include <sys/sleepqueue.h>
78 #include <sys/syscallsubr.h>
79 #include <sys/sysctl.h>
80 #include <sys/sysent.h>
81 #include <sys/syslog.h>
82 #include <sys/sysproto.h>
83 #include <sys/timers.h>
84 #include <sys/unistd.h>
87 #include <vm/vm_extern.h>
92 #include <machine/cpu.h>
94 #include <security/audit/audit.h>
96 #define ONSIG 32 /* NSIG for osig* syscalls. XXX. */
98 SDT_PROVIDER_DECLARE(proc);
99 SDT_PROBE_DEFINE3(proc, , , signal__send,
100 "struct thread *", "struct proc *", "int");
101 SDT_PROBE_DEFINE2(proc, , , signal__clear,
102 "int", "ksiginfo_t *");
103 SDT_PROBE_DEFINE3(proc, , , signal__discard,
104 "struct thread *", "struct proc *", "int");
106 static int coredump(struct thread *);
107 static int killpg1(struct thread *td, int sig, int pgid, int all,
109 static int issignal(struct thread *td);
110 static void reschedule_signals(struct proc *p, sigset_t block, int flags);
111 static int sigprop(int sig);
112 static void tdsigwakeup(struct thread *, int, sig_t, int);
113 static int sig_suspend_threads(struct thread *, struct proc *, int);
114 static int filt_sigattach(struct knote *kn);
115 static void filt_sigdetach(struct knote *kn);
116 static int filt_signal(struct knote *kn, long hint);
117 static struct thread *sigtd(struct proc *p, int sig, bool fast_sigblock);
118 static void sigqueue_start(void);
120 static uma_zone_t ksiginfo_zone = NULL;
121 struct filterops sig_filtops = {
123 .f_attach = filt_sigattach,
124 .f_detach = filt_sigdetach,
125 .f_event = filt_signal,
128 static int kern_logsigexit = 1;
129 SYSCTL_INT(_kern, KERN_LOGSIGEXIT, logsigexit, CTLFLAG_RW,
131 "Log processes quitting on abnormal signals to syslog(3)");
133 static int kern_forcesigexit = 1;
134 SYSCTL_INT(_kern, OID_AUTO, forcesigexit, CTLFLAG_RW,
135 &kern_forcesigexit, 0, "Force trap signal to be handled");
137 static SYSCTL_NODE(_kern, OID_AUTO, sigqueue, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
138 "POSIX real time signal");
140 static int max_pending_per_proc = 128;
141 SYSCTL_INT(_kern_sigqueue, OID_AUTO, max_pending_per_proc, CTLFLAG_RW,
142 &max_pending_per_proc, 0, "Max pending signals per proc");
144 static int preallocate_siginfo = 1024;
145 SYSCTL_INT(_kern_sigqueue, OID_AUTO, preallocate, CTLFLAG_RDTUN,
146 &preallocate_siginfo, 0, "Preallocated signal memory size");
148 static int signal_overflow = 0;
149 SYSCTL_INT(_kern_sigqueue, OID_AUTO, overflow, CTLFLAG_RD,
150 &signal_overflow, 0, "Number of signals overflew");
152 static int signal_alloc_fail = 0;
153 SYSCTL_INT(_kern_sigqueue, OID_AUTO, alloc_fail, CTLFLAG_RD,
154 &signal_alloc_fail, 0, "signals failed to be allocated");
156 static int kern_lognosys = 0;
157 SYSCTL_INT(_kern, OID_AUTO, lognosys, CTLFLAG_RWTUN, &kern_lognosys, 0,
158 "Log invalid syscalls");
160 __read_frequently bool sigfastblock_fetch_always = false;
161 SYSCTL_BOOL(_kern, OID_AUTO, sigfastblock_fetch_always, CTLFLAG_RWTUN,
162 &sigfastblock_fetch_always, 0,
163 "Fetch sigfastblock word on each syscall entry for proper "
164 "blocking semantic");
166 static bool kern_sig_discard_ign = true;
167 SYSCTL_BOOL(_kern, OID_AUTO, sig_discard_ign, CTLFLAG_RWTUN,
168 &kern_sig_discard_ign, 0,
169 "Discard ignored signals on delivery, otherwise queue them to "
172 SYSINIT(signal, SI_SUB_P1003_1B, SI_ORDER_FIRST+3, sigqueue_start, NULL);
175 * Policy -- Can ucred cr1 send SIGIO to process cr2?
176 * Should use cr_cansignal() once cr_cansignal() allows SIGIO and SIGURG
177 * in the right situations.
179 #define CANSIGIO(cr1, cr2) \
180 ((cr1)->cr_uid == 0 || \
181 (cr1)->cr_ruid == (cr2)->cr_ruid || \
182 (cr1)->cr_uid == (cr2)->cr_ruid || \
183 (cr1)->cr_ruid == (cr2)->cr_uid || \
184 (cr1)->cr_uid == (cr2)->cr_uid)
186 static int sugid_coredump;
187 SYSCTL_INT(_kern, OID_AUTO, sugid_coredump, CTLFLAG_RWTUN,
188 &sugid_coredump, 0, "Allow setuid and setgid processes to dump core");
190 static int capmode_coredump;
191 SYSCTL_INT(_kern, OID_AUTO, capmode_coredump, CTLFLAG_RWTUN,
192 &capmode_coredump, 0, "Allow processes in capability mode to dump core");
194 static int do_coredump = 1;
195 SYSCTL_INT(_kern, OID_AUTO, coredump, CTLFLAG_RW,
196 &do_coredump, 0, "Enable/Disable coredumps");
198 static int set_core_nodump_flag = 0;
199 SYSCTL_INT(_kern, OID_AUTO, nodump_coredump, CTLFLAG_RW, &set_core_nodump_flag,
200 0, "Enable setting the NODUMP flag on coredump files");
202 static int coredump_devctl = 0;
203 SYSCTL_INT(_kern, OID_AUTO, coredump_devctl, CTLFLAG_RW, &coredump_devctl,
204 0, "Generate a devctl notification when processes coredump");
207 * Signal properties and actions.
208 * The array below categorizes the signals and their default actions
209 * according to the following properties:
211 #define SIGPROP_KILL 0x01 /* terminates process by default */
212 #define SIGPROP_CORE 0x02 /* ditto and coredumps */
213 #define SIGPROP_STOP 0x04 /* suspend process */
214 #define SIGPROP_TTYSTOP 0x08 /* ditto, from tty */
215 #define SIGPROP_IGNORE 0x10 /* ignore by default */
216 #define SIGPROP_CONT 0x20 /* continue if suspended */
218 static int sigproptbl[NSIG] = {
219 [SIGHUP] = SIGPROP_KILL,
220 [SIGINT] = SIGPROP_KILL,
221 [SIGQUIT] = SIGPROP_KILL | SIGPROP_CORE,
222 [SIGILL] = SIGPROP_KILL | SIGPROP_CORE,
223 [SIGTRAP] = SIGPROP_KILL | SIGPROP_CORE,
224 [SIGABRT] = SIGPROP_KILL | SIGPROP_CORE,
225 [SIGEMT] = SIGPROP_KILL | SIGPROP_CORE,
226 [SIGFPE] = SIGPROP_KILL | SIGPROP_CORE,
227 [SIGKILL] = SIGPROP_KILL,
228 [SIGBUS] = SIGPROP_KILL | SIGPROP_CORE,
229 [SIGSEGV] = SIGPROP_KILL | SIGPROP_CORE,
230 [SIGSYS] = SIGPROP_KILL | SIGPROP_CORE,
231 [SIGPIPE] = SIGPROP_KILL,
232 [SIGALRM] = SIGPROP_KILL,
233 [SIGTERM] = SIGPROP_KILL,
234 [SIGURG] = SIGPROP_IGNORE,
235 [SIGSTOP] = SIGPROP_STOP,
236 [SIGTSTP] = SIGPROP_STOP | SIGPROP_TTYSTOP,
237 [SIGCONT] = SIGPROP_IGNORE | SIGPROP_CONT,
238 [SIGCHLD] = SIGPROP_IGNORE,
239 [SIGTTIN] = SIGPROP_STOP | SIGPROP_TTYSTOP,
240 [SIGTTOU] = SIGPROP_STOP | SIGPROP_TTYSTOP,
241 [SIGIO] = SIGPROP_IGNORE,
242 [SIGXCPU] = SIGPROP_KILL,
243 [SIGXFSZ] = SIGPROP_KILL,
244 [SIGVTALRM] = SIGPROP_KILL,
245 [SIGPROF] = SIGPROP_KILL,
246 [SIGWINCH] = SIGPROP_IGNORE,
247 [SIGINFO] = SIGPROP_IGNORE,
248 [SIGUSR1] = SIGPROP_KILL,
249 [SIGUSR2] = SIGPROP_KILL,
252 sigset_t fastblock_mask;
257 ksiginfo_zone = uma_zcreate("ksiginfo", sizeof(ksiginfo_t),
258 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
259 uma_prealloc(ksiginfo_zone, preallocate_siginfo);
260 p31b_setcfg(CTL_P1003_1B_REALTIME_SIGNALS, _POSIX_REALTIME_SIGNALS);
261 p31b_setcfg(CTL_P1003_1B_RTSIG_MAX, SIGRTMAX - SIGRTMIN + 1);
262 p31b_setcfg(CTL_P1003_1B_SIGQUEUE_MAX, max_pending_per_proc);
263 SIGFILLSET(fastblock_mask);
264 SIG_CANTMASK(fastblock_mask);
268 ksiginfo_alloc(int wait)
275 if (ksiginfo_zone != NULL)
276 return ((ksiginfo_t *)uma_zalloc(ksiginfo_zone, flags));
281 ksiginfo_free(ksiginfo_t *ksi)
283 uma_zfree(ksiginfo_zone, ksi);
287 ksiginfo_tryfree(ksiginfo_t *ksi)
289 if (!(ksi->ksi_flags & KSI_EXT)) {
290 uma_zfree(ksiginfo_zone, ksi);
297 sigqueue_init(sigqueue_t *list, struct proc *p)
299 SIGEMPTYSET(list->sq_signals);
300 SIGEMPTYSET(list->sq_kill);
301 SIGEMPTYSET(list->sq_ptrace);
302 TAILQ_INIT(&list->sq_list);
304 list->sq_flags = SQ_INIT;
308 * Get a signal's ksiginfo.
310 * 0 - signal not found
311 * others - signal number
314 sigqueue_get(sigqueue_t *sq, int signo, ksiginfo_t *si)
316 struct proc *p = sq->sq_proc;
317 struct ksiginfo *ksi, *next;
320 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
322 if (!SIGISMEMBER(sq->sq_signals, signo))
325 if (SIGISMEMBER(sq->sq_ptrace, signo)) {
327 SIGDELSET(sq->sq_ptrace, signo);
328 si->ksi_flags |= KSI_PTRACE;
330 if (SIGISMEMBER(sq->sq_kill, signo)) {
333 SIGDELSET(sq->sq_kill, signo);
336 TAILQ_FOREACH_SAFE(ksi, &sq->sq_list, ksi_link, next) {
337 if (ksi->ksi_signo == signo) {
339 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
340 ksi->ksi_sigq = NULL;
341 ksiginfo_copy(ksi, si);
342 if (ksiginfo_tryfree(ksi) && p != NULL)
351 SIGDELSET(sq->sq_signals, signo);
352 si->ksi_signo = signo;
357 sigqueue_take(ksiginfo_t *ksi)
363 if (ksi == NULL || (sq = ksi->ksi_sigq) == NULL)
367 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
368 ksi->ksi_sigq = NULL;
369 if (!(ksi->ksi_flags & KSI_EXT) && p != NULL)
372 for (kp = TAILQ_FIRST(&sq->sq_list); kp != NULL;
373 kp = TAILQ_NEXT(kp, ksi_link)) {
374 if (kp->ksi_signo == ksi->ksi_signo)
377 if (kp == NULL && !SIGISMEMBER(sq->sq_kill, ksi->ksi_signo) &&
378 !SIGISMEMBER(sq->sq_ptrace, ksi->ksi_signo))
379 SIGDELSET(sq->sq_signals, ksi->ksi_signo);
383 sigqueue_add(sigqueue_t *sq, int signo, ksiginfo_t *si)
385 struct proc *p = sq->sq_proc;
386 struct ksiginfo *ksi;
389 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
392 * SIGKILL/SIGSTOP cannot be caught or masked, so take the fast path
395 if (signo == SIGKILL || signo == SIGSTOP || si == NULL) {
396 SIGADDSET(sq->sq_kill, signo);
400 /* directly insert the ksi, don't copy it */
401 if (si->ksi_flags & KSI_INS) {
402 if (si->ksi_flags & KSI_HEAD)
403 TAILQ_INSERT_HEAD(&sq->sq_list, si, ksi_link);
405 TAILQ_INSERT_TAIL(&sq->sq_list, si, ksi_link);
410 if (__predict_false(ksiginfo_zone == NULL)) {
411 SIGADDSET(sq->sq_kill, signo);
415 if (p != NULL && p->p_pendingcnt >= max_pending_per_proc) {
418 } else if ((ksi = ksiginfo_alloc(0)) == NULL) {
424 ksiginfo_copy(si, ksi);
425 ksi->ksi_signo = signo;
426 if (si->ksi_flags & KSI_HEAD)
427 TAILQ_INSERT_HEAD(&sq->sq_list, ksi, ksi_link);
429 TAILQ_INSERT_TAIL(&sq->sq_list, ksi, ksi_link);
434 if ((si->ksi_flags & KSI_PTRACE) != 0) {
435 SIGADDSET(sq->sq_ptrace, signo);
438 } else if ((si->ksi_flags & KSI_TRAP) != 0 ||
439 (si->ksi_flags & KSI_SIGQ) == 0) {
440 SIGADDSET(sq->sq_kill, signo);
448 SIGADDSET(sq->sq_signals, signo);
453 sigqueue_flush(sigqueue_t *sq)
455 struct proc *p = sq->sq_proc;
458 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
461 PROC_LOCK_ASSERT(p, MA_OWNED);
463 while ((ksi = TAILQ_FIRST(&sq->sq_list)) != NULL) {
464 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
465 ksi->ksi_sigq = NULL;
466 if (ksiginfo_tryfree(ksi) && p != NULL)
470 SIGEMPTYSET(sq->sq_signals);
471 SIGEMPTYSET(sq->sq_kill);
472 SIGEMPTYSET(sq->sq_ptrace);
476 sigqueue_move_set(sigqueue_t *src, sigqueue_t *dst, const sigset_t *set)
479 struct proc *p1, *p2;
480 ksiginfo_t *ksi, *next;
482 KASSERT(src->sq_flags & SQ_INIT, ("src sigqueue not inited"));
483 KASSERT(dst->sq_flags & SQ_INIT, ("dst sigqueue not inited"));
486 /* Move siginfo to target list */
487 TAILQ_FOREACH_SAFE(ksi, &src->sq_list, ksi_link, next) {
488 if (SIGISMEMBER(*set, ksi->ksi_signo)) {
489 TAILQ_REMOVE(&src->sq_list, ksi, ksi_link);
492 TAILQ_INSERT_TAIL(&dst->sq_list, ksi, ksi_link);
499 /* Move pending bits to target list */
501 SIGSETAND(tmp, *set);
502 SIGSETOR(dst->sq_kill, tmp);
503 SIGSETNAND(src->sq_kill, tmp);
505 tmp = src->sq_ptrace;
506 SIGSETAND(tmp, *set);
507 SIGSETOR(dst->sq_ptrace, tmp);
508 SIGSETNAND(src->sq_ptrace, tmp);
510 tmp = src->sq_signals;
511 SIGSETAND(tmp, *set);
512 SIGSETOR(dst->sq_signals, tmp);
513 SIGSETNAND(src->sq_signals, tmp);
518 sigqueue_move(sigqueue_t *src, sigqueue_t *dst, int signo)
523 SIGADDSET(set, signo);
524 sigqueue_move_set(src, dst, &set);
529 sigqueue_delete_set(sigqueue_t *sq, const sigset_t *set)
531 struct proc *p = sq->sq_proc;
532 ksiginfo_t *ksi, *next;
534 KASSERT(sq->sq_flags & SQ_INIT, ("src sigqueue not inited"));
536 /* Remove siginfo queue */
537 TAILQ_FOREACH_SAFE(ksi, &sq->sq_list, ksi_link, next) {
538 if (SIGISMEMBER(*set, ksi->ksi_signo)) {
539 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
540 ksi->ksi_sigq = NULL;
541 if (ksiginfo_tryfree(ksi) && p != NULL)
545 SIGSETNAND(sq->sq_kill, *set);
546 SIGSETNAND(sq->sq_ptrace, *set);
547 SIGSETNAND(sq->sq_signals, *set);
551 sigqueue_delete(sigqueue_t *sq, int signo)
556 SIGADDSET(set, signo);
557 sigqueue_delete_set(sq, &set);
560 /* Remove a set of signals for a process */
562 sigqueue_delete_set_proc(struct proc *p, const sigset_t *set)
567 PROC_LOCK_ASSERT(p, MA_OWNED);
569 sigqueue_init(&worklist, NULL);
570 sigqueue_move_set(&p->p_sigqueue, &worklist, set);
572 FOREACH_THREAD_IN_PROC(p, td0)
573 sigqueue_move_set(&td0->td_sigqueue, &worklist, set);
575 sigqueue_flush(&worklist);
579 sigqueue_delete_proc(struct proc *p, int signo)
584 SIGADDSET(set, signo);
585 sigqueue_delete_set_proc(p, &set);
589 sigqueue_delete_stopmask_proc(struct proc *p)
594 SIGADDSET(set, SIGSTOP);
595 SIGADDSET(set, SIGTSTP);
596 SIGADDSET(set, SIGTTIN);
597 SIGADDSET(set, SIGTTOU);
598 sigqueue_delete_set_proc(p, &set);
602 * Determine signal that should be delivered to thread td, the current
603 * thread, 0 if none. If there is a pending stop signal with default
604 * action, the process stops in issignal().
607 cursig(struct thread *td)
609 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
610 mtx_assert(&td->td_proc->p_sigacts->ps_mtx, MA_OWNED);
611 THREAD_LOCK_ASSERT(td, MA_NOTOWNED);
612 return (SIGPENDING(td) ? issignal(td) : 0);
616 * Arrange for ast() to handle unmasked pending signals on return to user
617 * mode. This must be called whenever a signal is added to td_sigqueue or
618 * unmasked in td_sigmask.
621 signotify(struct thread *td)
624 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
626 if (SIGPENDING(td)) {
628 td->td_flags |= TDF_NEEDSIGCHK | TDF_ASTPENDING;
634 * Returns 1 (true) if altstack is configured for the thread, and the
635 * passed stack bottom address falls into the altstack range. Handles
636 * the 43 compat special case where the alt stack size is zero.
639 sigonstack(size_t sp)
644 if ((td->td_pflags & TDP_ALTSTACK) == 0)
646 #if defined(COMPAT_43)
647 if (SV_PROC_FLAG(td->td_proc, SV_AOUT) && td->td_sigstk.ss_size == 0)
648 return ((td->td_sigstk.ss_flags & SS_ONSTACK) != 0);
650 return (sp >= (size_t)td->td_sigstk.ss_sp &&
651 sp < td->td_sigstk.ss_size + (size_t)td->td_sigstk.ss_sp);
658 if (sig > 0 && sig < nitems(sigproptbl))
659 return (sigproptbl[sig]);
664 sig_ffs(sigset_t *set)
668 for (i = 0; i < _SIG_WORDS; i++)
670 return (ffs(set->__bits[i]) + (i * 32));
675 sigact_flag_test(const struct sigaction *act, int flag)
679 * SA_SIGINFO is reset when signal disposition is set to
680 * ignore or default. Other flags are kept according to user
683 return ((act->sa_flags & flag) != 0 && (flag != SA_SIGINFO ||
684 ((__sighandler_t *)act->sa_sigaction != SIG_IGN &&
685 (__sighandler_t *)act->sa_sigaction != SIG_DFL)));
695 kern_sigaction(struct thread *td, int sig, const struct sigaction *act,
696 struct sigaction *oact, int flags)
699 struct proc *p = td->td_proc;
701 if (!_SIG_VALID(sig))
703 if (act != NULL && act->sa_handler != SIG_DFL &&
704 act->sa_handler != SIG_IGN && (act->sa_flags & ~(SA_ONSTACK |
705 SA_RESTART | SA_RESETHAND | SA_NOCLDSTOP | SA_NODEFER |
706 SA_NOCLDWAIT | SA_SIGINFO)) != 0)
711 mtx_lock(&ps->ps_mtx);
713 memset(oact, 0, sizeof(*oact));
714 oact->sa_mask = ps->ps_catchmask[_SIG_IDX(sig)];
715 if (SIGISMEMBER(ps->ps_sigonstack, sig))
716 oact->sa_flags |= SA_ONSTACK;
717 if (!SIGISMEMBER(ps->ps_sigintr, sig))
718 oact->sa_flags |= SA_RESTART;
719 if (SIGISMEMBER(ps->ps_sigreset, sig))
720 oact->sa_flags |= SA_RESETHAND;
721 if (SIGISMEMBER(ps->ps_signodefer, sig))
722 oact->sa_flags |= SA_NODEFER;
723 if (SIGISMEMBER(ps->ps_siginfo, sig)) {
724 oact->sa_flags |= SA_SIGINFO;
726 (__siginfohandler_t *)ps->ps_sigact[_SIG_IDX(sig)];
728 oact->sa_handler = ps->ps_sigact[_SIG_IDX(sig)];
729 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDSTOP)
730 oact->sa_flags |= SA_NOCLDSTOP;
731 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDWAIT)
732 oact->sa_flags |= SA_NOCLDWAIT;
735 if ((sig == SIGKILL || sig == SIGSTOP) &&
736 act->sa_handler != SIG_DFL) {
737 mtx_unlock(&ps->ps_mtx);
743 * Change setting atomically.
746 ps->ps_catchmask[_SIG_IDX(sig)] = act->sa_mask;
747 SIG_CANTMASK(ps->ps_catchmask[_SIG_IDX(sig)]);
748 if (sigact_flag_test(act, SA_SIGINFO)) {
749 ps->ps_sigact[_SIG_IDX(sig)] =
750 (__sighandler_t *)act->sa_sigaction;
751 SIGADDSET(ps->ps_siginfo, sig);
753 ps->ps_sigact[_SIG_IDX(sig)] = act->sa_handler;
754 SIGDELSET(ps->ps_siginfo, sig);
756 if (!sigact_flag_test(act, SA_RESTART))
757 SIGADDSET(ps->ps_sigintr, sig);
759 SIGDELSET(ps->ps_sigintr, sig);
760 if (sigact_flag_test(act, SA_ONSTACK))
761 SIGADDSET(ps->ps_sigonstack, sig);
763 SIGDELSET(ps->ps_sigonstack, sig);
764 if (sigact_flag_test(act, SA_RESETHAND))
765 SIGADDSET(ps->ps_sigreset, sig);
767 SIGDELSET(ps->ps_sigreset, sig);
768 if (sigact_flag_test(act, SA_NODEFER))
769 SIGADDSET(ps->ps_signodefer, sig);
771 SIGDELSET(ps->ps_signodefer, sig);
772 if (sig == SIGCHLD) {
773 if (act->sa_flags & SA_NOCLDSTOP)
774 ps->ps_flag |= PS_NOCLDSTOP;
776 ps->ps_flag &= ~PS_NOCLDSTOP;
777 if (act->sa_flags & SA_NOCLDWAIT) {
779 * Paranoia: since SA_NOCLDWAIT is implemented
780 * by reparenting the dying child to PID 1 (and
781 * trust it to reap the zombie), PID 1 itself
782 * is forbidden to set SA_NOCLDWAIT.
785 ps->ps_flag &= ~PS_NOCLDWAIT;
787 ps->ps_flag |= PS_NOCLDWAIT;
789 ps->ps_flag &= ~PS_NOCLDWAIT;
790 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN)
791 ps->ps_flag |= PS_CLDSIGIGN;
793 ps->ps_flag &= ~PS_CLDSIGIGN;
796 * Set bit in ps_sigignore for signals that are set to SIG_IGN,
797 * and for signals set to SIG_DFL where the default is to
798 * ignore. However, don't put SIGCONT in ps_sigignore, as we
799 * have to restart the process.
801 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
802 (sigprop(sig) & SIGPROP_IGNORE &&
803 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)) {
804 /* never to be seen again */
805 sigqueue_delete_proc(p, sig);
807 /* easier in psignal */
808 SIGADDSET(ps->ps_sigignore, sig);
809 SIGDELSET(ps->ps_sigcatch, sig);
811 SIGDELSET(ps->ps_sigignore, sig);
812 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)
813 SIGDELSET(ps->ps_sigcatch, sig);
815 SIGADDSET(ps->ps_sigcatch, sig);
817 #ifdef COMPAT_FREEBSD4
818 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
819 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL ||
820 (flags & KSA_FREEBSD4) == 0)
821 SIGDELSET(ps->ps_freebsd4, sig);
823 SIGADDSET(ps->ps_freebsd4, sig);
826 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
827 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL ||
828 (flags & KSA_OSIGSET) == 0)
829 SIGDELSET(ps->ps_osigset, sig);
831 SIGADDSET(ps->ps_osigset, sig);
834 mtx_unlock(&ps->ps_mtx);
839 #ifndef _SYS_SYSPROTO_H_
840 struct sigaction_args {
842 struct sigaction *act;
843 struct sigaction *oact;
847 sys_sigaction(struct thread *td, struct sigaction_args *uap)
849 struct sigaction act, oact;
850 struct sigaction *actp, *oactp;
853 actp = (uap->act != NULL) ? &act : NULL;
854 oactp = (uap->oact != NULL) ? &oact : NULL;
856 error = copyin(uap->act, actp, sizeof(act));
860 error = kern_sigaction(td, uap->sig, actp, oactp, 0);
862 error = copyout(oactp, uap->oact, sizeof(oact));
866 #ifdef COMPAT_FREEBSD4
867 #ifndef _SYS_SYSPROTO_H_
868 struct freebsd4_sigaction_args {
870 struct sigaction *act;
871 struct sigaction *oact;
875 freebsd4_sigaction(struct thread *td, struct freebsd4_sigaction_args *uap)
877 struct sigaction act, oact;
878 struct sigaction *actp, *oactp;
881 actp = (uap->act != NULL) ? &act : NULL;
882 oactp = (uap->oact != NULL) ? &oact : NULL;
884 error = copyin(uap->act, actp, sizeof(act));
888 error = kern_sigaction(td, uap->sig, actp, oactp, KSA_FREEBSD4);
890 error = copyout(oactp, uap->oact, sizeof(oact));
893 #endif /* COMAPT_FREEBSD4 */
895 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
896 #ifndef _SYS_SYSPROTO_H_
897 struct osigaction_args {
899 struct osigaction *nsa;
900 struct osigaction *osa;
904 osigaction(struct thread *td, struct osigaction_args *uap)
906 struct osigaction sa;
907 struct sigaction nsa, osa;
908 struct sigaction *nsap, *osap;
911 if (uap->signum <= 0 || uap->signum >= ONSIG)
914 nsap = (uap->nsa != NULL) ? &nsa : NULL;
915 osap = (uap->osa != NULL) ? &osa : NULL;
918 error = copyin(uap->nsa, &sa, sizeof(sa));
921 nsap->sa_handler = sa.sa_handler;
922 nsap->sa_flags = sa.sa_flags;
923 OSIG2SIG(sa.sa_mask, nsap->sa_mask);
925 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET);
926 if (osap && !error) {
927 sa.sa_handler = osap->sa_handler;
928 sa.sa_flags = osap->sa_flags;
929 SIG2OSIG(osap->sa_mask, sa.sa_mask);
930 error = copyout(&sa, uap->osa, sizeof(sa));
935 #if !defined(__i386__)
936 /* Avoid replicating the same stub everywhere */
938 osigreturn(struct thread *td, struct osigreturn_args *uap)
941 return (nosys(td, (struct nosys_args *)uap));
944 #endif /* COMPAT_43 */
947 * Initialize signal state for process 0;
948 * set to ignore signals that are ignored by default.
951 siginit(struct proc *p)
958 mtx_lock(&ps->ps_mtx);
959 for (i = 1; i <= NSIG; i++) {
960 if (sigprop(i) & SIGPROP_IGNORE && i != SIGCONT) {
961 SIGADDSET(ps->ps_sigignore, i);
964 mtx_unlock(&ps->ps_mtx);
969 * Reset specified signal to the default disposition.
972 sigdflt(struct sigacts *ps, int sig)
975 mtx_assert(&ps->ps_mtx, MA_OWNED);
976 SIGDELSET(ps->ps_sigcatch, sig);
977 if ((sigprop(sig) & SIGPROP_IGNORE) != 0 && sig != SIGCONT)
978 SIGADDSET(ps->ps_sigignore, sig);
979 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
980 SIGDELSET(ps->ps_siginfo, sig);
984 * Reset signals for an exec of the specified process.
987 execsigs(struct proc *p)
993 * Reset caught signals. Held signals remain held
994 * through td_sigmask (unless they were caught,
995 * and are now ignored by default).
997 PROC_LOCK_ASSERT(p, MA_OWNED);
999 mtx_lock(&ps->ps_mtx);
1003 * Reset stack state to the user stack.
1004 * Clear set of signals caught on the signal stack.
1007 MPASS(td->td_proc == p);
1008 td->td_sigstk.ss_flags = SS_DISABLE;
1009 td->td_sigstk.ss_size = 0;
1010 td->td_sigstk.ss_sp = 0;
1011 td->td_pflags &= ~TDP_ALTSTACK;
1013 * Reset no zombies if child dies flag as Solaris does.
1015 ps->ps_flag &= ~(PS_NOCLDWAIT | PS_CLDSIGIGN);
1016 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN)
1017 ps->ps_sigact[_SIG_IDX(SIGCHLD)] = SIG_DFL;
1018 mtx_unlock(&ps->ps_mtx);
1022 * kern_sigprocmask()
1024 * Manipulate signal mask.
1027 kern_sigprocmask(struct thread *td, int how, sigset_t *set, sigset_t *oset,
1030 sigset_t new_block, oset1;
1035 if ((flags & SIGPROCMASK_PROC_LOCKED) != 0)
1036 PROC_LOCK_ASSERT(p, MA_OWNED);
1039 mtx_assert(&p->p_sigacts->ps_mtx, (flags & SIGPROCMASK_PS_LOCKED) != 0
1040 ? MA_OWNED : MA_NOTOWNED);
1042 *oset = td->td_sigmask;
1049 oset1 = td->td_sigmask;
1050 SIGSETOR(td->td_sigmask, *set);
1051 new_block = td->td_sigmask;
1052 SIGSETNAND(new_block, oset1);
1055 SIGSETNAND(td->td_sigmask, *set);
1060 oset1 = td->td_sigmask;
1061 if (flags & SIGPROCMASK_OLD)
1062 SIGSETLO(td->td_sigmask, *set);
1064 td->td_sigmask = *set;
1065 new_block = td->td_sigmask;
1066 SIGSETNAND(new_block, oset1);
1075 * The new_block set contains signals that were not previously
1076 * blocked, but are blocked now.
1078 * In case we block any signal that was not previously blocked
1079 * for td, and process has the signal pending, try to schedule
1080 * signal delivery to some thread that does not block the
1081 * signal, possibly waking it up.
1083 if (p->p_numthreads != 1)
1084 reschedule_signals(p, new_block, flags);
1088 if (!(flags & SIGPROCMASK_PROC_LOCKED))
1093 #ifndef _SYS_SYSPROTO_H_
1094 struct sigprocmask_args {
1096 const sigset_t *set;
1101 sys_sigprocmask(struct thread *td, struct sigprocmask_args *uap)
1104 sigset_t *setp, *osetp;
1107 setp = (uap->set != NULL) ? &set : NULL;
1108 osetp = (uap->oset != NULL) ? &oset : NULL;
1110 error = copyin(uap->set, setp, sizeof(set));
1114 error = kern_sigprocmask(td, uap->how, setp, osetp, 0);
1115 if (osetp && !error) {
1116 error = copyout(osetp, uap->oset, sizeof(oset));
1121 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1122 #ifndef _SYS_SYSPROTO_H_
1123 struct osigprocmask_args {
1129 osigprocmask(struct thread *td, struct osigprocmask_args *uap)
1134 OSIG2SIG(uap->mask, set);
1135 error = kern_sigprocmask(td, uap->how, &set, &oset, 1);
1136 SIG2OSIG(oset, td->td_retval[0]);
1139 #endif /* COMPAT_43 */
1142 sys_sigwait(struct thread *td, struct sigwait_args *uap)
1148 error = copyin(uap->set, &set, sizeof(set));
1150 td->td_retval[0] = error;
1154 error = kern_sigtimedwait(td, set, &ksi, NULL);
1157 * sigwait() function shall not return EINTR, but
1158 * the syscall does. Non-ancient libc provides the
1159 * wrapper which hides EINTR. Otherwise, EINTR return
1160 * is used by libthr to handle required cancellation
1161 * point in the sigwait().
1163 if (error == EINTR && td->td_proc->p_osrel < P_OSREL_SIGWAIT)
1165 td->td_retval[0] = error;
1169 error = copyout(&ksi.ksi_signo, uap->sig, sizeof(ksi.ksi_signo));
1170 td->td_retval[0] = error;
1175 sys_sigtimedwait(struct thread *td, struct sigtimedwait_args *uap)
1178 struct timespec *timeout;
1184 error = copyin(uap->timeout, &ts, sizeof(ts));
1192 error = copyin(uap->set, &set, sizeof(set));
1196 error = kern_sigtimedwait(td, set, &ksi, timeout);
1201 error = copyout(&ksi.ksi_info, uap->info, sizeof(siginfo_t));
1204 td->td_retval[0] = ksi.ksi_signo;
1209 sys_sigwaitinfo(struct thread *td, struct sigwaitinfo_args *uap)
1215 error = copyin(uap->set, &set, sizeof(set));
1219 error = kern_sigtimedwait(td, set, &ksi, NULL);
1224 error = copyout(&ksi.ksi_info, uap->info, sizeof(siginfo_t));
1227 td->td_retval[0] = ksi.ksi_signo;
1232 proc_td_siginfo_capture(struct thread *td, siginfo_t *si)
1236 FOREACH_THREAD_IN_PROC(td->td_proc, thr) {
1240 thr->td_si.si_signo = 0;
1245 kern_sigtimedwait(struct thread *td, sigset_t waitset, ksiginfo_t *ksi,
1246 struct timespec *timeout)
1249 sigset_t saved_mask, new_block;
1251 int error, sig, timo, timevalid = 0;
1252 struct timespec rts, ets, ts;
1262 /* Ensure the sigfastblock value is up to date. */
1263 sigfastblock_fetch(td);
1265 if (timeout != NULL) {
1266 if (timeout->tv_nsec >= 0 && timeout->tv_nsec < 1000000000) {
1268 getnanouptime(&rts);
1269 timespecadd(&rts, timeout, &ets);
1273 /* Some signals can not be waited for. */
1274 SIG_CANTMASK(waitset);
1277 saved_mask = td->td_sigmask;
1278 SIGSETNAND(td->td_sigmask, waitset);
1279 if ((p->p_sysent->sv_flags & SV_SIG_DISCIGN) != 0 ||
1280 !kern_sig_discard_ign) {
1282 td->td_flags |= TDF_SIGWAIT;
1286 mtx_lock(&ps->ps_mtx);
1288 mtx_unlock(&ps->ps_mtx);
1289 KASSERT(sig >= 0, ("sig %d", sig));
1290 if (sig != 0 && SIGISMEMBER(waitset, sig)) {
1291 if (sigqueue_get(&td->td_sigqueue, sig, ksi) != 0 ||
1292 sigqueue_get(&p->p_sigqueue, sig, ksi) != 0) {
1302 * POSIX says this must be checked after looking for pending
1305 if (timeout != NULL) {
1310 getnanouptime(&rts);
1311 if (timespeccmp(&rts, &ets, >=)) {
1315 timespecsub(&ets, &rts, &ts);
1316 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1327 error = msleep(&p->p_sigacts, &p->p_mtx, PPAUSE | PCATCH,
1330 /* The syscalls can not be restarted. */
1331 if (error == ERESTART)
1334 /* We will calculate timeout by ourself. */
1335 if (timeout != NULL && error == EAGAIN)
1339 * If PTRACE_SCE or PTRACE_SCX were set after
1340 * userspace entered the syscall, return spurious
1341 * EINTR after wait was done. Only do this as last
1342 * resort after rechecking for possible queued signals
1343 * and expired timeouts.
1345 if (error == 0 && (p->p_ptevents & PTRACE_SYSCALL) != 0)
1349 td->td_flags &= ~TDF_SIGWAIT;
1352 new_block = saved_mask;
1353 SIGSETNAND(new_block, td->td_sigmask);
1354 td->td_sigmask = saved_mask;
1356 * Fewer signals can be delivered to us, reschedule signal
1359 if (p->p_numthreads != 1)
1360 reschedule_signals(p, new_block, 0);
1363 SDT_PROBE2(proc, , , signal__clear, sig, ksi);
1365 if (ksi->ksi_code == SI_TIMER)
1366 itimer_accept(p, ksi->ksi_timerid, ksi);
1369 if (KTRPOINT(td, KTR_PSIG)) {
1372 mtx_lock(&ps->ps_mtx);
1373 action = ps->ps_sigact[_SIG_IDX(sig)];
1374 mtx_unlock(&ps->ps_mtx);
1375 ktrpsig(sig, action, &td->td_sigmask, ksi->ksi_code);
1378 if (sig == SIGKILL) {
1379 proc_td_siginfo_capture(td, &ksi->ksi_info);
1387 #ifndef _SYS_SYSPROTO_H_
1388 struct sigpending_args {
1393 sys_sigpending(struct thread *td, struct sigpending_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 return (copyout(&pending, uap->set, sizeof(sigset_t)));
1405 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1406 #ifndef _SYS_SYSPROTO_H_
1407 struct osigpending_args {
1412 osigpending(struct thread *td, struct osigpending_args *uap)
1414 struct proc *p = td->td_proc;
1418 pending = p->p_sigqueue.sq_signals;
1419 SIGSETOR(pending, td->td_sigqueue.sq_signals);
1421 SIG2OSIG(pending, td->td_retval[0]);
1424 #endif /* COMPAT_43 */
1426 #if defined(COMPAT_43)
1428 * Generalized interface signal handler, 4.3-compatible.
1430 #ifndef _SYS_SYSPROTO_H_
1431 struct osigvec_args {
1439 osigvec(struct thread *td, struct osigvec_args *uap)
1442 struct sigaction nsa, osa;
1443 struct sigaction *nsap, *osap;
1446 if (uap->signum <= 0 || uap->signum >= ONSIG)
1448 nsap = (uap->nsv != NULL) ? &nsa : NULL;
1449 osap = (uap->osv != NULL) ? &osa : NULL;
1451 error = copyin(uap->nsv, &vec, sizeof(vec));
1454 nsap->sa_handler = vec.sv_handler;
1455 OSIG2SIG(vec.sv_mask, nsap->sa_mask);
1456 nsap->sa_flags = vec.sv_flags;
1457 nsap->sa_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */
1459 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET);
1460 if (osap && !error) {
1461 vec.sv_handler = osap->sa_handler;
1462 SIG2OSIG(osap->sa_mask, vec.sv_mask);
1463 vec.sv_flags = osap->sa_flags;
1464 vec.sv_flags &= ~SA_NOCLDWAIT;
1465 vec.sv_flags ^= SA_RESTART;
1466 error = copyout(&vec, uap->osv, sizeof(vec));
1471 #ifndef _SYS_SYSPROTO_H_
1472 struct osigblock_args {
1477 osigblock(struct thread *td, struct osigblock_args *uap)
1481 OSIG2SIG(uap->mask, set);
1482 kern_sigprocmask(td, SIG_BLOCK, &set, &oset, 0);
1483 SIG2OSIG(oset, td->td_retval[0]);
1487 #ifndef _SYS_SYSPROTO_H_
1488 struct osigsetmask_args {
1493 osigsetmask(struct thread *td, struct osigsetmask_args *uap)
1497 OSIG2SIG(uap->mask, set);
1498 kern_sigprocmask(td, SIG_SETMASK, &set, &oset, 0);
1499 SIG2OSIG(oset, td->td_retval[0]);
1502 #endif /* COMPAT_43 */
1505 * Suspend calling thread until signal, providing mask to be set in the
1508 #ifndef _SYS_SYSPROTO_H_
1509 struct sigsuspend_args {
1510 const sigset_t *sigmask;
1515 sys_sigsuspend(struct thread *td, struct sigsuspend_args *uap)
1520 error = copyin(uap->sigmask, &mask, sizeof(mask));
1523 return (kern_sigsuspend(td, mask));
1527 kern_sigsuspend(struct thread *td, sigset_t mask)
1529 struct proc *p = td->td_proc;
1532 /* Ensure the sigfastblock value is up to date. */
1533 sigfastblock_fetch(td);
1536 * When returning from sigsuspend, we want
1537 * the old mask to be restored after the
1538 * signal handler has finished. Thus, we
1539 * save it here and mark the sigacts structure
1543 kern_sigprocmask(td, SIG_SETMASK, &mask, &td->td_oldsigmask,
1544 SIGPROCMASK_PROC_LOCKED);
1545 td->td_pflags |= TDP_OLDMASK;
1548 * Process signals now. Otherwise, we can get spurious wakeup
1549 * due to signal entered process queue, but delivered to other
1550 * thread. But sigsuspend should return only on signal
1553 (p->p_sysent->sv_set_syscall_retval)(td, EINTR);
1554 for (has_sig = 0; !has_sig;) {
1555 while (msleep(&p->p_sigacts, &p->p_mtx, PPAUSE|PCATCH, "pause",
1558 thread_suspend_check(0);
1559 mtx_lock(&p->p_sigacts->ps_mtx);
1560 while ((sig = cursig(td)) != 0) {
1561 KASSERT(sig >= 0, ("sig %d", sig));
1562 has_sig += postsig(sig);
1564 mtx_unlock(&p->p_sigacts->ps_mtx);
1567 * If PTRACE_SCE or PTRACE_SCX were set after
1568 * userspace entered the syscall, return spurious
1571 if ((p->p_ptevents & PTRACE_SYSCALL) != 0)
1575 td->td_errno = EINTR;
1576 td->td_pflags |= TDP_NERRNO;
1577 return (EJUSTRETURN);
1580 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1582 * Compatibility sigsuspend call for old binaries. Note nonstandard calling
1583 * convention: libc stub passes mask, not pointer, to save a copyin.
1585 #ifndef _SYS_SYSPROTO_H_
1586 struct osigsuspend_args {
1592 osigsuspend(struct thread *td, struct osigsuspend_args *uap)
1596 OSIG2SIG(uap->mask, mask);
1597 return (kern_sigsuspend(td, mask));
1599 #endif /* COMPAT_43 */
1601 #if defined(COMPAT_43)
1602 #ifndef _SYS_SYSPROTO_H_
1603 struct osigstack_args {
1604 struct sigstack *nss;
1605 struct sigstack *oss;
1610 osigstack(struct thread *td, struct osigstack_args *uap)
1612 struct sigstack nss, oss;
1615 if (uap->nss != NULL) {
1616 error = copyin(uap->nss, &nss, sizeof(nss));
1620 oss.ss_sp = td->td_sigstk.ss_sp;
1621 oss.ss_onstack = sigonstack(cpu_getstack(td));
1622 if (uap->nss != NULL) {
1623 td->td_sigstk.ss_sp = nss.ss_sp;
1624 td->td_sigstk.ss_size = 0;
1625 td->td_sigstk.ss_flags |= nss.ss_onstack & SS_ONSTACK;
1626 td->td_pflags |= TDP_ALTSTACK;
1628 if (uap->oss != NULL)
1629 error = copyout(&oss, uap->oss, sizeof(oss));
1633 #endif /* COMPAT_43 */
1635 #ifndef _SYS_SYSPROTO_H_
1636 struct sigaltstack_args {
1643 sys_sigaltstack(struct thread *td, struct sigaltstack_args *uap)
1648 if (uap->ss != NULL) {
1649 error = copyin(uap->ss, &ss, sizeof(ss));
1653 error = kern_sigaltstack(td, (uap->ss != NULL) ? &ss : NULL,
1654 (uap->oss != NULL) ? &oss : NULL);
1657 if (uap->oss != NULL)
1658 error = copyout(&oss, uap->oss, sizeof(stack_t));
1663 kern_sigaltstack(struct thread *td, stack_t *ss, stack_t *oss)
1665 struct proc *p = td->td_proc;
1668 oonstack = sigonstack(cpu_getstack(td));
1671 *oss = td->td_sigstk;
1672 oss->ss_flags = (td->td_pflags & TDP_ALTSTACK)
1673 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
1679 if ((ss->ss_flags & ~SS_DISABLE) != 0)
1681 if (!(ss->ss_flags & SS_DISABLE)) {
1682 if (ss->ss_size < p->p_sysent->sv_minsigstksz)
1685 td->td_sigstk = *ss;
1686 td->td_pflags |= TDP_ALTSTACK;
1688 td->td_pflags &= ~TDP_ALTSTACK;
1694 struct killpg1_ctx {
1704 killpg1_sendsig(struct proc *p, bool notself, struct killpg1_ctx *arg)
1708 if (p->p_pid <= 1 || (p->p_flag & P_SYSTEM) != 0 ||
1709 (notself && p == arg->td->td_proc) || p->p_state == PRS_NEW)
1712 err = p_cansignal(arg->td, p, arg->sig);
1713 if (err == 0 && arg->sig != 0)
1714 pksignal(p, arg->sig, arg->ksi);
1720 else if (arg->ret == 0 && err != ESRCH && err != EPERM)
1725 * Common code for kill process group/broadcast kill.
1726 * cp is calling process.
1729 killpg1(struct thread *td, int sig, int pgid, int all, ksiginfo_t *ksi)
1733 struct killpg1_ctx arg;
1745 sx_slock(&allproc_lock);
1746 FOREACH_PROC_IN_SYSTEM(p) {
1747 killpg1_sendsig(p, true, &arg);
1749 sx_sunlock(&allproc_lock);
1751 sx_slock(&proctree_lock);
1754 * zero pgid means send to my process group.
1756 pgrp = td->td_proc->p_pgrp;
1759 pgrp = pgfind(pgid);
1761 sx_sunlock(&proctree_lock);
1765 sx_sunlock(&proctree_lock);
1766 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
1767 killpg1_sendsig(p, false, &arg);
1771 MPASS(arg.ret != 0 || arg.found || !arg.sent);
1772 if (arg.ret == 0 && !arg.sent)
1773 arg.ret = arg.found ? EPERM : ESRCH;
1777 #ifndef _SYS_SYSPROTO_H_
1785 sys_kill(struct thread *td, struct kill_args *uap)
1788 return (kern_kill(td, uap->pid, uap->signum));
1792 kern_kill(struct thread *td, pid_t pid, int signum)
1799 * A process in capability mode can send signals only to himself.
1800 * The main rationale behind this is that abort(3) is implemented as
1801 * kill(getpid(), SIGABRT).
1803 if (IN_CAPABILITY_MODE(td) && pid != td->td_proc->p_pid)
1806 AUDIT_ARG_SIGNUM(signum);
1808 if ((u_int)signum > _SIG_MAXSIG)
1811 ksiginfo_init(&ksi);
1812 ksi.ksi_signo = signum;
1813 ksi.ksi_code = SI_USER;
1814 ksi.ksi_pid = td->td_proc->p_pid;
1815 ksi.ksi_uid = td->td_ucred->cr_ruid;
1818 /* kill single process */
1819 if ((p = pfind_any(pid)) == NULL)
1821 AUDIT_ARG_PROCESS(p);
1822 error = p_cansignal(td, p, signum);
1823 if (error == 0 && signum)
1824 pksignal(p, signum, &ksi);
1829 case -1: /* broadcast signal */
1830 return (killpg1(td, signum, 0, 1, &ksi));
1831 case 0: /* signal own process group */
1832 return (killpg1(td, signum, 0, 0, &ksi));
1833 default: /* negative explicit process group */
1834 return (killpg1(td, signum, -pid, 0, &ksi));
1840 sys_pdkill(struct thread *td, struct pdkill_args *uap)
1845 AUDIT_ARG_SIGNUM(uap->signum);
1846 AUDIT_ARG_FD(uap->fd);
1847 if ((u_int)uap->signum > _SIG_MAXSIG)
1850 error = procdesc_find(td, uap->fd, &cap_pdkill_rights, &p);
1853 AUDIT_ARG_PROCESS(p);
1854 error = p_cansignal(td, p, uap->signum);
1855 if (error == 0 && uap->signum)
1856 kern_psignal(p, uap->signum);
1861 #if defined(COMPAT_43)
1862 #ifndef _SYS_SYSPROTO_H_
1863 struct okillpg_args {
1870 okillpg(struct thread *td, struct okillpg_args *uap)
1874 AUDIT_ARG_SIGNUM(uap->signum);
1875 AUDIT_ARG_PID(uap->pgid);
1876 if ((u_int)uap->signum > _SIG_MAXSIG)
1879 ksiginfo_init(&ksi);
1880 ksi.ksi_signo = uap->signum;
1881 ksi.ksi_code = SI_USER;
1882 ksi.ksi_pid = td->td_proc->p_pid;
1883 ksi.ksi_uid = td->td_ucred->cr_ruid;
1884 return (killpg1(td, uap->signum, uap->pgid, 0, &ksi));
1886 #endif /* COMPAT_43 */
1888 #ifndef _SYS_SYSPROTO_H_
1889 struct sigqueue_args {
1892 /* union sigval */ void *value;
1896 sys_sigqueue(struct thread *td, struct sigqueue_args *uap)
1900 sv.sival_ptr = uap->value;
1902 return (kern_sigqueue(td, uap->pid, uap->signum, &sv));
1906 kern_sigqueue(struct thread *td, pid_t pid, int signum, union sigval *value)
1912 if ((u_int)signum > _SIG_MAXSIG)
1916 * Specification says sigqueue can only send signal to
1922 if ((p = pfind_any(pid)) == NULL)
1924 error = p_cansignal(td, p, signum);
1925 if (error == 0 && signum != 0) {
1926 ksiginfo_init(&ksi);
1927 ksi.ksi_flags = KSI_SIGQ;
1928 ksi.ksi_signo = signum;
1929 ksi.ksi_code = SI_QUEUE;
1930 ksi.ksi_pid = td->td_proc->p_pid;
1931 ksi.ksi_uid = td->td_ucred->cr_ruid;
1932 ksi.ksi_value = *value;
1933 error = pksignal(p, ksi.ksi_signo, &ksi);
1940 * Send a signal to a process group.
1943 gsignal(int pgid, int sig, ksiginfo_t *ksi)
1948 sx_slock(&proctree_lock);
1949 pgrp = pgfind(pgid);
1950 sx_sunlock(&proctree_lock);
1952 pgsignal(pgrp, sig, 0, ksi);
1959 * Send a signal to a process group. If checktty is 1,
1960 * limit to members which have a controlling terminal.
1963 pgsignal(struct pgrp *pgrp, int sig, int checkctty, ksiginfo_t *ksi)
1968 PGRP_LOCK_ASSERT(pgrp, MA_OWNED);
1969 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
1971 if (p->p_state == PRS_NORMAL &&
1972 (checkctty == 0 || p->p_flag & P_CONTROLT))
1973 pksignal(p, sig, ksi);
1980 * Recalculate the signal mask and reset the signal disposition after
1981 * usermode frame for delivery is formed. Should be called after
1982 * mach-specific routine, because sysent->sv_sendsig() needs correct
1983 * ps_siginfo and signal mask.
1986 postsig_done(int sig, struct thread *td, struct sigacts *ps)
1990 mtx_assert(&ps->ps_mtx, MA_OWNED);
1991 td->td_ru.ru_nsignals++;
1992 mask = ps->ps_catchmask[_SIG_IDX(sig)];
1993 if (!SIGISMEMBER(ps->ps_signodefer, sig))
1994 SIGADDSET(mask, sig);
1995 kern_sigprocmask(td, SIG_BLOCK, &mask, NULL,
1996 SIGPROCMASK_PROC_LOCKED | SIGPROCMASK_PS_LOCKED);
1997 if (SIGISMEMBER(ps->ps_sigreset, sig))
2002 * Send a signal caused by a trap to the current thread. If it will be
2003 * caught immediately, deliver it with correct code. Otherwise, post it
2007 trapsignal(struct thread *td, ksiginfo_t *ksi)
2015 sig = ksi->ksi_signo;
2016 code = ksi->ksi_code;
2017 KASSERT(_SIG_VALID(sig), ("invalid signal"));
2019 sigfastblock_fetch(td);
2022 mtx_lock(&ps->ps_mtx);
2023 sigmask = td->td_sigmask;
2024 if (td->td_sigblock_val != 0)
2025 SIGSETOR(sigmask, fastblock_mask);
2026 if ((p->p_flag & P_TRACED) == 0 && SIGISMEMBER(ps->ps_sigcatch, sig) &&
2027 !SIGISMEMBER(sigmask, sig)) {
2029 if (KTRPOINT(curthread, KTR_PSIG))
2030 ktrpsig(sig, ps->ps_sigact[_SIG_IDX(sig)],
2031 &td->td_sigmask, code);
2033 (*p->p_sysent->sv_sendsig)(ps->ps_sigact[_SIG_IDX(sig)],
2034 ksi, &td->td_sigmask);
2035 postsig_done(sig, td, ps);
2036 mtx_unlock(&ps->ps_mtx);
2039 * Avoid a possible infinite loop if the thread
2040 * masking the signal or process is ignoring the
2043 if (kern_forcesigexit && (SIGISMEMBER(sigmask, sig) ||
2044 ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN)) {
2045 SIGDELSET(td->td_sigmask, sig);
2046 SIGDELSET(ps->ps_sigcatch, sig);
2047 SIGDELSET(ps->ps_sigignore, sig);
2048 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
2049 td->td_pflags &= ~TDP_SIGFASTBLOCK;
2050 td->td_sigblock_val = 0;
2052 mtx_unlock(&ps->ps_mtx);
2053 p->p_sig = sig; /* XXX to verify code */
2054 tdsendsignal(p, td, sig, ksi);
2059 static struct thread *
2060 sigtd(struct proc *p, int sig, bool fast_sigblock)
2062 struct thread *td, *signal_td;
2064 PROC_LOCK_ASSERT(p, MA_OWNED);
2065 MPASS(!fast_sigblock || p == curproc);
2068 * Check if current thread can handle the signal without
2069 * switching context to another thread.
2071 if (curproc == p && !SIGISMEMBER(curthread->td_sigmask, sig) &&
2072 (!fast_sigblock || curthread->td_sigblock_val == 0))
2075 FOREACH_THREAD_IN_PROC(p, td) {
2076 if (!SIGISMEMBER(td->td_sigmask, sig) && (!fast_sigblock ||
2077 td != curthread || td->td_sigblock_val == 0)) {
2082 if (signal_td == NULL)
2083 signal_td = FIRST_THREAD_IN_PROC(p);
2088 * Send the signal to the process. If the signal has an action, the action
2089 * is usually performed by the target process rather than the caller; we add
2090 * the signal to the set of pending signals for the process.
2093 * o When a stop signal is sent to a sleeping process that takes the
2094 * default action, the process is stopped without awakening it.
2095 * o SIGCONT restarts stopped processes (or puts them back to sleep)
2096 * regardless of the signal action (eg, blocked or ignored).
2098 * Other ignored signals are discarded immediately.
2100 * NB: This function may be entered from the debugger via the "kill" DDB
2101 * command. There is little that can be done to mitigate the possibly messy
2102 * side effects of this unwise possibility.
2105 kern_psignal(struct proc *p, int sig)
2109 ksiginfo_init(&ksi);
2110 ksi.ksi_signo = sig;
2111 ksi.ksi_code = SI_KERNEL;
2112 (void) tdsendsignal(p, NULL, sig, &ksi);
2116 pksignal(struct proc *p, int sig, ksiginfo_t *ksi)
2119 return (tdsendsignal(p, NULL, sig, ksi));
2122 /* Utility function for finding a thread to send signal event to. */
2124 sigev_findtd(struct proc *p ,struct sigevent *sigev, struct thread **ttd)
2128 if (sigev->sigev_notify == SIGEV_THREAD_ID) {
2129 td = tdfind(sigev->sigev_notify_thread_id, p->p_pid);
2141 tdsignal(struct thread *td, int sig)
2145 ksiginfo_init(&ksi);
2146 ksi.ksi_signo = sig;
2147 ksi.ksi_code = SI_KERNEL;
2148 (void) tdsendsignal(td->td_proc, td, sig, &ksi);
2152 tdksignal(struct thread *td, int sig, ksiginfo_t *ksi)
2155 (void) tdsendsignal(td->td_proc, td, sig, ksi);
2159 sig_sleepq_abort(struct thread *td, int intrval)
2161 THREAD_LOCK_ASSERT(td, MA_OWNED);
2163 if (intrval == 0 && (td->td_flags & TDF_SIGWAIT) == 0) {
2167 return (sleepq_abort(td, intrval));
2171 tdsendsignal(struct proc *p, struct thread *td, int sig, ksiginfo_t *ksi)
2174 sigqueue_t *sigqueue;
2181 MPASS(td == NULL || p == td->td_proc);
2182 PROC_LOCK_ASSERT(p, MA_OWNED);
2184 if (!_SIG_VALID(sig))
2185 panic("%s(): invalid signal %d", __func__, sig);
2187 KASSERT(ksi == NULL || !KSI_ONQ(ksi), ("%s: ksi on queue", __func__));
2190 * IEEE Std 1003.1-2001: return success when killing a zombie.
2192 if (p->p_state == PRS_ZOMBIE) {
2193 if (ksi && (ksi->ksi_flags & KSI_INS))
2194 ksiginfo_tryfree(ksi);
2199 KNOTE_LOCKED(p->p_klist, NOTE_SIGNAL | sig);
2200 prop = sigprop(sig);
2203 td = sigtd(p, sig, false);
2204 sigqueue = &p->p_sigqueue;
2206 sigqueue = &td->td_sigqueue;
2208 SDT_PROBE3(proc, , , signal__send, td, p, sig);
2211 * If the signal is being ignored, then we forget about it
2212 * immediately, except when the target process executes
2213 * sigwait(). (Note: we don't set SIGCONT in ps_sigignore,
2214 * and if it is set to SIG_IGN, action will be SIG_DFL here.)
2216 mtx_lock(&ps->ps_mtx);
2217 if (SIGISMEMBER(ps->ps_sigignore, sig)) {
2218 if (kern_sig_discard_ign &&
2219 (p->p_sysent->sv_flags & SV_SIG_DISCIGN) == 0) {
2220 SDT_PROBE3(proc, , , signal__discard, td, p, sig);
2222 mtx_unlock(&ps->ps_mtx);
2223 if (ksi && (ksi->ksi_flags & KSI_INS))
2224 ksiginfo_tryfree(ksi);
2231 if (SIGISMEMBER(td->td_sigmask, sig))
2233 else if (SIGISMEMBER(ps->ps_sigcatch, sig))
2237 if (SIGISMEMBER(ps->ps_sigintr, sig))
2242 mtx_unlock(&ps->ps_mtx);
2244 if (prop & SIGPROP_CONT)
2245 sigqueue_delete_stopmask_proc(p);
2246 else if (prop & SIGPROP_STOP) {
2248 * If sending a tty stop signal to a member of an orphaned
2249 * process group, discard the signal here if the action
2250 * is default; don't stop the process below if sleeping,
2251 * and don't clear any pending SIGCONT.
2253 if ((prop & SIGPROP_TTYSTOP) != 0 &&
2254 (p->p_pgrp->pg_flags & PGRP_ORPHANED) != 0 &&
2255 action == SIG_DFL) {
2256 if (ksi && (ksi->ksi_flags & KSI_INS))
2257 ksiginfo_tryfree(ksi);
2260 sigqueue_delete_proc(p, SIGCONT);
2261 if (p->p_flag & P_CONTINUED) {
2262 p->p_flag &= ~P_CONTINUED;
2263 PROC_LOCK(p->p_pptr);
2264 sigqueue_take(p->p_ksi);
2265 PROC_UNLOCK(p->p_pptr);
2269 ret = sigqueue_add(sigqueue, sig, ksi);
2274 * Defer further processing for signals which are held,
2275 * except that stopped processes must be continued by SIGCONT.
2277 if (action == SIG_HOLD &&
2278 !((prop & SIGPROP_CONT) && (p->p_flag & P_STOPPED_SIG)))
2284 * Some signals have a process-wide effect and a per-thread
2285 * component. Most processing occurs when the process next
2286 * tries to cross the user boundary, however there are some
2287 * times when processing needs to be done immediately, such as
2288 * waking up threads so that they can cross the user boundary.
2289 * We try to do the per-process part here.
2291 if (P_SHOULDSTOP(p)) {
2292 KASSERT(!(p->p_flag & P_WEXIT),
2293 ("signal to stopped but exiting process"));
2294 if (sig == SIGKILL) {
2296 * If traced process is already stopped,
2297 * then no further action is necessary.
2299 if (p->p_flag & P_TRACED)
2302 * SIGKILL sets process running.
2303 * It will die elsewhere.
2304 * All threads must be restarted.
2306 p->p_flag &= ~P_STOPPED_SIG;
2310 if (prop & SIGPROP_CONT) {
2312 * If traced process is already stopped,
2313 * then no further action is necessary.
2315 if (p->p_flag & P_TRACED)
2318 * If SIGCONT is default (or ignored), we continue the
2319 * process but don't leave the signal in sigqueue as
2320 * it has no further action. If SIGCONT is held, we
2321 * continue the process and leave the signal in
2322 * sigqueue. If the process catches SIGCONT, let it
2323 * handle the signal itself. If it isn't waiting on
2324 * an event, it goes back to run state.
2325 * Otherwise, process goes back to sleep state.
2327 p->p_flag &= ~P_STOPPED_SIG;
2329 if (p->p_numthreads == p->p_suspcount) {
2331 p->p_flag |= P_CONTINUED;
2332 p->p_xsig = SIGCONT;
2333 PROC_LOCK(p->p_pptr);
2334 childproc_continued(p);
2335 PROC_UNLOCK(p->p_pptr);
2338 if (action == SIG_DFL) {
2339 thread_unsuspend(p);
2341 sigqueue_delete(sigqueue, sig);
2344 if (action == SIG_CATCH) {
2346 * The process wants to catch it so it needs
2347 * to run at least one thread, but which one?
2353 * The signal is not ignored or caught.
2355 thread_unsuspend(p);
2360 if (prop & SIGPROP_STOP) {
2362 * If traced process is already stopped,
2363 * then no further action is necessary.
2365 if (p->p_flag & P_TRACED)
2368 * Already stopped, don't need to stop again
2369 * (If we did the shell could get confused).
2370 * Just make sure the signal STOP bit set.
2372 p->p_flag |= P_STOPPED_SIG;
2373 sigqueue_delete(sigqueue, sig);
2378 * All other kinds of signals:
2379 * If a thread is sleeping interruptibly, simulate a
2380 * wakeup so that when it is continued it will be made
2381 * runnable and can look at the signal. However, don't make
2382 * the PROCESS runnable, leave it stopped.
2383 * It may run a bit until it hits a thread_suspend_check().
2387 if (TD_CAN_ABORT(td))
2388 wakeup_swapper = sig_sleepq_abort(td, intrval);
2394 * Mutexes are short lived. Threads waiting on them will
2395 * hit thread_suspend_check() soon.
2397 } else if (p->p_state == PRS_NORMAL) {
2398 if (p->p_flag & P_TRACED || action == SIG_CATCH) {
2399 tdsigwakeup(td, sig, action, intrval);
2403 MPASS(action == SIG_DFL);
2405 if (prop & SIGPROP_STOP) {
2406 if (p->p_flag & (P_PPWAIT|P_WEXIT))
2408 p->p_flag |= P_STOPPED_SIG;
2411 wakeup_swapper = sig_suspend_threads(td, p, 1);
2412 if (p->p_numthreads == p->p_suspcount) {
2414 * only thread sending signal to another
2415 * process can reach here, if thread is sending
2416 * signal to its process, because thread does
2417 * not suspend itself here, p_numthreads
2418 * should never be equal to p_suspcount.
2422 sigqueue_delete_proc(p, p->p_xsig);
2428 /* Not in "NORMAL" state. discard the signal. */
2429 sigqueue_delete(sigqueue, sig);
2434 * The process is not stopped so we need to apply the signal to all the
2438 tdsigwakeup(td, sig, action, intrval);
2440 thread_unsuspend(p);
2443 itimer_proc_continue(p);
2444 kqtimer_proc_continue(p);
2446 /* If we jump here, proc slock should not be owned. */
2447 PROC_SLOCK_ASSERT(p, MA_NOTOWNED);
2455 * The force of a signal has been directed against a single
2456 * thread. We need to see what we can do about knocking it
2457 * out of any sleep it may be in etc.
2460 tdsigwakeup(struct thread *td, int sig, sig_t action, int intrval)
2462 struct proc *p = td->td_proc;
2463 int prop, wakeup_swapper;
2465 PROC_LOCK_ASSERT(p, MA_OWNED);
2466 prop = sigprop(sig);
2471 * Bring the priority of a thread up if we want it to get
2472 * killed in this lifetime. Be careful to avoid bumping the
2473 * priority of the idle thread, since we still allow to signal
2476 if (action == SIG_DFL && (prop & SIGPROP_KILL) != 0 &&
2477 td->td_priority > PUSER && !TD_IS_IDLETHREAD(td))
2478 sched_prio(td, PUSER);
2479 if (TD_ON_SLEEPQ(td)) {
2481 * If thread is sleeping uninterruptibly
2482 * we can't interrupt the sleep... the signal will
2483 * be noticed when the process returns through
2484 * trap() or syscall().
2486 if ((td->td_flags & TDF_SINTR) == 0)
2489 * If SIGCONT is default (or ignored) and process is
2490 * asleep, we are finished; the process should not
2493 if ((prop & SIGPROP_CONT) && action == SIG_DFL) {
2496 sigqueue_delete(&p->p_sigqueue, sig);
2498 * It may be on either list in this state.
2499 * Remove from both for now.
2501 sigqueue_delete(&td->td_sigqueue, sig);
2506 * Don't awaken a sleeping thread for SIGSTOP if the
2507 * STOP signal is deferred.
2509 if ((prop & SIGPROP_STOP) != 0 && (td->td_flags & (TDF_SBDRY |
2510 TDF_SERESTART | TDF_SEINTR)) == TDF_SBDRY)
2514 * Give low priority threads a better chance to run.
2516 if (td->td_priority > PUSER && !TD_IS_IDLETHREAD(td))
2517 sched_prio(td, PUSER);
2519 wakeup_swapper = sig_sleepq_abort(td, intrval);
2527 * Other states do nothing with the signal immediately,
2528 * other than kicking ourselves if we are running.
2529 * It will either never be noticed, or noticed very soon.
2532 if (TD_IS_RUNNING(td) && td != curthread)
2542 ptrace_coredump(struct thread *td)
2545 struct thr_coredump_req *tcq;
2548 MPASS(td == curthread);
2550 PROC_LOCK_ASSERT(p, MA_OWNED);
2551 if ((td->td_dbgflags & TDB_COREDUMPRQ) == 0)
2553 KASSERT((p->p_flag & P_STOPPED_TRACE) != 0, ("not stopped"));
2555 tcq = td->td_coredump;
2556 KASSERT(tcq != NULL, ("td_coredump is NULL"));
2558 if (p->p_sysent->sv_coredump == NULL) {
2559 tcq->tc_error = ENOSYS;
2564 rl_cookie = vn_rangelock_wlock(tcq->tc_vp, 0, OFF_MAX);
2566 tcq->tc_error = p->p_sysent->sv_coredump(td, tcq->tc_vp,
2567 tcq->tc_limit, tcq->tc_flags);
2569 vn_rangelock_unlock(tcq->tc_vp, rl_cookie);
2572 td->td_dbgflags &= ~TDB_COREDUMPRQ;
2573 td->td_coredump = NULL;
2578 sig_suspend_threads(struct thread *td, struct proc *p, int sending)
2583 PROC_LOCK_ASSERT(p, MA_OWNED);
2584 PROC_SLOCK_ASSERT(p, MA_OWNED);
2585 MPASS(sending || td == curthread);
2588 FOREACH_THREAD_IN_PROC(p, td2) {
2590 td2->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
2591 if ((TD_IS_SLEEPING(td2) || TD_IS_SWAPPED(td2)) &&
2592 (td2->td_flags & TDF_SINTR)) {
2593 if (td2->td_flags & TDF_SBDRY) {
2595 * Once a thread is asleep with
2596 * TDF_SBDRY and without TDF_SERESTART
2597 * or TDF_SEINTR set, it should never
2598 * become suspended due to this check.
2600 KASSERT(!TD_IS_SUSPENDED(td2),
2601 ("thread with deferred stops suspended"));
2602 if (TD_SBDRY_INTR(td2)) {
2603 wakeup_swapper |= sleepq_abort(td2,
2604 TD_SBDRY_ERRNO(td2));
2607 } else if (!TD_IS_SUSPENDED(td2))
2608 thread_suspend_one(td2);
2609 } else if (!TD_IS_SUSPENDED(td2)) {
2610 if (sending || td != td2)
2611 td2->td_flags |= TDF_ASTPENDING;
2613 if (TD_IS_RUNNING(td2) && td2 != td)
2614 forward_signal(td2);
2619 return (wakeup_swapper);
2623 * Stop the process for an event deemed interesting to the debugger. If si is
2624 * non-NULL, this is a signal exchange; the new signal requested by the
2625 * debugger will be returned for handling. If si is NULL, this is some other
2626 * type of interesting event. The debugger may request a signal be delivered in
2627 * that case as well, however it will be deferred until it can be handled.
2630 ptracestop(struct thread *td, int sig, ksiginfo_t *si)
2632 struct proc *p = td->td_proc;
2636 PROC_LOCK_ASSERT(p, MA_OWNED);
2637 KASSERT(!(p->p_flag & P_WEXIT), ("Stopping exiting process"));
2638 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK,
2639 &p->p_mtx.lock_object, "Stopping for traced signal");
2643 if (si == NULL || (si->ksi_flags & KSI_PTRACE) == 0) {
2644 td->td_dbgflags |= TDB_XSIG;
2645 CTR4(KTR_PTRACE, "ptracestop: tid %d (pid %d) flags %#x sig %d",
2646 td->td_tid, p->p_pid, td->td_dbgflags, sig);
2648 while ((p->p_flag & P_TRACED) && (td->td_dbgflags & TDB_XSIG)) {
2651 * Ensure that, if we've been PT_KILLed, the
2652 * exit status reflects that. Another thread
2653 * may also be in ptracestop(), having just
2654 * received the SIGKILL, but this thread was
2655 * unsuspended first.
2657 td->td_dbgflags &= ~TDB_XSIG;
2658 td->td_xsig = SIGKILL;
2662 if (p->p_flag & P_SINGLE_EXIT &&
2663 !(td->td_dbgflags & TDB_EXIT)) {
2665 * Ignore ptrace stops except for thread exit
2666 * events when the process exits.
2668 td->td_dbgflags &= ~TDB_XSIG;
2674 * Make wait(2) work. Ensure that right after the
2675 * attach, the thread which was decided to become the
2676 * leader of attach gets reported to the waiter.
2677 * Otherwise, just avoid overwriting another thread's
2678 * assignment to p_xthread. If another thread has
2679 * already set p_xthread, the current thread will get
2680 * a chance to report itself upon the next iteration.
2682 if ((td->td_dbgflags & TDB_FSTP) != 0 ||
2683 ((p->p_flag2 & P2_PTRACE_FSTP) == 0 &&
2684 p->p_xthread == NULL)) {
2689 * If we are on sleepqueue already,
2690 * let sleepqueue code decide if it
2691 * needs to go sleep after attach.
2693 if (td->td_wchan == NULL)
2694 td->td_dbgflags &= ~TDB_FSTP;
2696 p->p_flag2 &= ~P2_PTRACE_FSTP;
2697 p->p_flag |= P_STOPPED_SIG | P_STOPPED_TRACE;
2698 sig_suspend_threads(td, p, 0);
2700 if ((td->td_dbgflags & TDB_STOPATFORK) != 0) {
2701 td->td_dbgflags &= ~TDB_STOPATFORK;
2704 td->td_dbgflags |= TDB_SSWITCH;
2705 thread_suspend_switch(td, p);
2706 td->td_dbgflags &= ~TDB_SSWITCH;
2707 if ((td->td_dbgflags & TDB_COREDUMPRQ) != 0) {
2709 ptrace_coredump(td);
2713 if (p->p_xthread == td)
2714 p->p_xthread = NULL;
2715 if (!(p->p_flag & P_TRACED))
2717 if (td->td_dbgflags & TDB_SUSPEND) {
2718 if (p->p_flag & P_SINGLE_EXIT)
2726 if (si != NULL && sig == td->td_xsig) {
2727 /* Parent wants us to take the original signal unchanged. */
2728 si->ksi_flags |= KSI_HEAD;
2729 if (sigqueue_add(&td->td_sigqueue, sig, si) != 0)
2731 } else if (td->td_xsig != 0) {
2733 * If parent wants us to take a new signal, then it will leave
2734 * it in td->td_xsig; otherwise we just look for signals again.
2736 ksiginfo_init(&ksi);
2737 ksi.ksi_signo = td->td_xsig;
2738 ksi.ksi_flags |= KSI_PTRACE;
2739 td2 = sigtd(p, td->td_xsig, false);
2740 tdsendsignal(p, td2, td->td_xsig, &ksi);
2745 return (td->td_xsig);
2749 reschedule_signals(struct proc *p, sigset_t block, int flags)
2754 bool fastblk, pslocked;
2756 PROC_LOCK_ASSERT(p, MA_OWNED);
2758 pslocked = (flags & SIGPROCMASK_PS_LOCKED) != 0;
2759 mtx_assert(&ps->ps_mtx, pslocked ? MA_OWNED : MA_NOTOWNED);
2760 if (SIGISEMPTY(p->p_siglist))
2762 SIGSETAND(block, p->p_siglist);
2763 fastblk = (flags & SIGPROCMASK_FASTBLK) != 0;
2764 while ((sig = sig_ffs(&block)) != 0) {
2765 SIGDELSET(block, sig);
2766 td = sigtd(p, sig, fastblk);
2769 * If sigtd() selected us despite sigfastblock is
2770 * blocking, do not activate AST or wake us, to avoid
2771 * loop in AST handler.
2773 if (fastblk && td == curthread)
2778 mtx_lock(&ps->ps_mtx);
2779 if (p->p_flag & P_TRACED ||
2780 (SIGISMEMBER(ps->ps_sigcatch, sig) &&
2781 !SIGISMEMBER(td->td_sigmask, sig))) {
2782 tdsigwakeup(td, sig, SIG_CATCH,
2783 (SIGISMEMBER(ps->ps_sigintr, sig) ? EINTR :
2787 mtx_unlock(&ps->ps_mtx);
2792 tdsigcleanup(struct thread *td)
2798 PROC_LOCK_ASSERT(p, MA_OWNED);
2800 sigqueue_flush(&td->td_sigqueue);
2801 if (p->p_numthreads == 1)
2805 * Since we cannot handle signals, notify signal post code
2806 * about this by filling the sigmask.
2808 * Also, if needed, wake up thread(s) that do not block the
2809 * same signals as the exiting thread, since the thread might
2810 * have been selected for delivery and woken up.
2812 SIGFILLSET(unblocked);
2813 SIGSETNAND(unblocked, td->td_sigmask);
2814 SIGFILLSET(td->td_sigmask);
2815 reschedule_signals(p, unblocked, 0);
2820 sigdeferstop_curr_flags(int cflags)
2823 MPASS((cflags & (TDF_SEINTR | TDF_SERESTART)) == 0 ||
2824 (cflags & TDF_SBDRY) != 0);
2825 return (cflags & (TDF_SBDRY | TDF_SEINTR | TDF_SERESTART));
2829 * Defer the delivery of SIGSTOP for the current thread, according to
2830 * the requested mode. Returns previous flags, which must be restored
2831 * by sigallowstop().
2833 * TDF_SBDRY, TDF_SEINTR, and TDF_SERESTART flags are only set and
2834 * cleared by the current thread, which allow the lock-less read-only
2838 sigdeferstop_impl(int mode)
2844 cflags = sigdeferstop_curr_flags(td->td_flags);
2846 case SIGDEFERSTOP_NOP:
2849 case SIGDEFERSTOP_OFF:
2852 case SIGDEFERSTOP_SILENT:
2853 nflags = (cflags | TDF_SBDRY) & ~(TDF_SEINTR | TDF_SERESTART);
2855 case SIGDEFERSTOP_EINTR:
2856 nflags = (cflags | TDF_SBDRY | TDF_SEINTR) & ~TDF_SERESTART;
2858 case SIGDEFERSTOP_ERESTART:
2859 nflags = (cflags | TDF_SBDRY | TDF_SERESTART) & ~TDF_SEINTR;
2862 panic("sigdeferstop: invalid mode %x", mode);
2865 if (cflags == nflags)
2866 return (SIGDEFERSTOP_VAL_NCHG);
2868 td->td_flags = (td->td_flags & ~cflags) | nflags;
2874 * Restores the STOP handling mode, typically permitting the delivery
2875 * of SIGSTOP for the current thread. This does not immediately
2876 * suspend if a stop was posted. Instead, the thread will suspend
2877 * either via ast() or a subsequent interruptible sleep.
2880 sigallowstop_impl(int prev)
2885 KASSERT(prev != SIGDEFERSTOP_VAL_NCHG, ("failed sigallowstop"));
2886 KASSERT((prev & ~(TDF_SBDRY | TDF_SEINTR | TDF_SERESTART)) == 0,
2887 ("sigallowstop: incorrect previous mode %x", prev));
2889 cflags = sigdeferstop_curr_flags(td->td_flags);
2890 if (cflags != prev) {
2892 td->td_flags = (td->td_flags & ~cflags) | prev;
2898 * If the current process has received a signal (should be caught or cause
2899 * termination, should interrupt current syscall), return the signal number.
2900 * Stop signals with default action are processed immediately, then cleared;
2901 * they aren't returned. This is checked after each entry to the system for
2902 * a syscall or trap (though this can usually be done without calling issignal
2903 * by checking the pending signal masks in cursig.) The normal call
2906 * while (sig = cursig(curthread))
2910 issignal(struct thread *td)
2914 struct sigqueue *queue;
2915 sigset_t sigpending;
2921 mtx_assert(&ps->ps_mtx, MA_OWNED);
2922 PROC_LOCK_ASSERT(p, MA_OWNED);
2924 sigpending = td->td_sigqueue.sq_signals;
2925 SIGSETOR(sigpending, p->p_sigqueue.sq_signals);
2926 SIGSETNAND(sigpending, td->td_sigmask);
2928 if ((p->p_flag & P_PPWAIT) != 0 || (td->td_flags &
2929 (TDF_SBDRY | TDF_SERESTART | TDF_SEINTR)) == TDF_SBDRY)
2930 SIG_STOPSIGMASK(sigpending);
2931 if (SIGISEMPTY(sigpending)) /* no signal to send */
2935 * Do fast sigblock if requested by usermode. Since
2936 * we do know that there was a signal pending at this
2937 * point, set the FAST_SIGBLOCK_PEND as indicator for
2938 * usermode to perform a dummy call to
2939 * FAST_SIGBLOCK_UNBLOCK, which causes immediate
2940 * delivery of postponed pending signal.
2942 if ((td->td_pflags & TDP_SIGFASTBLOCK) != 0) {
2943 if (td->td_sigblock_val != 0)
2944 SIGSETNAND(sigpending, fastblock_mask);
2945 if (SIGISEMPTY(sigpending)) {
2946 td->td_pflags |= TDP_SIGFASTPENDING;
2951 if ((p->p_flag & (P_TRACED | P_PPTRACE)) == P_TRACED &&
2952 (p->p_flag2 & P2_PTRACE_FSTP) != 0 &&
2953 SIGISMEMBER(sigpending, SIGSTOP)) {
2955 * If debugger just attached, always consume
2956 * SIGSTOP from ptrace(PT_ATTACH) first, to
2957 * execute the debugger attach ritual in
2961 td->td_dbgflags |= TDB_FSTP;
2963 sig = sig_ffs(&sigpending);
2967 * We should allow pending but ignored signals below
2968 * only if there is sigwait() active, or P_TRACED was
2969 * on when they were posted.
2971 if (SIGISMEMBER(ps->ps_sigignore, sig) &&
2972 (p->p_flag & P_TRACED) == 0 &&
2973 (td->td_flags & TDF_SIGWAIT) == 0) {
2974 sigqueue_delete(&td->td_sigqueue, sig);
2975 sigqueue_delete(&p->p_sigqueue, sig);
2978 if ((p->p_flag & (P_TRACED | P_PPTRACE)) == P_TRACED) {
2980 * If traced, always stop.
2981 * Remove old signal from queue before the stop.
2982 * XXX shrug off debugger, it causes siginfo to
2985 queue = &td->td_sigqueue;
2986 ksiginfo_init(&ksi);
2987 if (sigqueue_get(queue, sig, &ksi) == 0) {
2988 queue = &p->p_sigqueue;
2989 sigqueue_get(queue, sig, &ksi);
2991 td->td_si = ksi.ksi_info;
2993 mtx_unlock(&ps->ps_mtx);
2994 sig = ptracestop(td, sig, &ksi);
2995 mtx_lock(&ps->ps_mtx);
2997 td->td_si.si_signo = 0;
3000 * Keep looking if the debugger discarded or
3001 * replaced the signal.
3007 * If the signal became masked, re-queue it.
3009 if (SIGISMEMBER(td->td_sigmask, sig)) {
3010 ksi.ksi_flags |= KSI_HEAD;
3011 sigqueue_add(&p->p_sigqueue, sig, &ksi);
3016 * If the traced bit got turned off, requeue
3017 * the signal and go back up to the top to
3018 * rescan signals. This ensures that p_sig*
3019 * and p_sigact are consistent.
3021 if ((p->p_flag & P_TRACED) == 0) {
3022 ksi.ksi_flags |= KSI_HEAD;
3023 sigqueue_add(queue, sig, &ksi);
3028 prop = sigprop(sig);
3031 * Decide whether the signal should be returned.
3032 * Return the signal's number, or fall through
3033 * to clear it from the pending mask.
3035 switch ((intptr_t)p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) {
3036 case (intptr_t)SIG_DFL:
3038 * Don't take default actions on system processes.
3040 if (p->p_pid <= 1) {
3043 * Are you sure you want to ignore SIGSEGV
3046 printf("Process (pid %lu) got signal %d\n",
3047 (u_long)p->p_pid, sig);
3049 break; /* == ignore */
3052 * If there is a pending stop signal to process with
3053 * default action, stop here, then clear the signal.
3054 * Traced or exiting processes should ignore stops.
3055 * Additionally, a member of an orphaned process group
3056 * should ignore tty stops.
3058 if (prop & SIGPROP_STOP) {
3059 mtx_unlock(&ps->ps_mtx);
3060 if ((p->p_flag & (P_TRACED | P_WEXIT |
3061 P_SINGLE_EXIT)) != 0 || ((p->p_pgrp->
3062 pg_flags & PGRP_ORPHANED) != 0 &&
3063 (prop & SIGPROP_TTYSTOP) != 0)) {
3064 mtx_lock(&ps->ps_mtx);
3065 break; /* == ignore */
3067 if (TD_SBDRY_INTR(td)) {
3068 KASSERT((td->td_flags & TDF_SBDRY) != 0,
3069 ("lost TDF_SBDRY"));
3070 mtx_lock(&ps->ps_mtx);
3073 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK,
3074 &p->p_mtx.lock_object, "Catching SIGSTOP");
3075 sigqueue_delete(&td->td_sigqueue, sig);
3076 sigqueue_delete(&p->p_sigqueue, sig);
3077 p->p_flag |= P_STOPPED_SIG;
3080 sig_suspend_threads(td, p, 0);
3081 thread_suspend_switch(td, p);
3083 mtx_lock(&ps->ps_mtx);
3085 } else if ((prop & SIGPROP_IGNORE) != 0 &&
3086 (td->td_flags & TDF_SIGWAIT) == 0) {
3088 * Default action is to ignore; drop it if
3089 * not in kern_sigtimedwait().
3091 break; /* == ignore */
3096 case (intptr_t)SIG_IGN:
3097 if ((td->td_flags & TDF_SIGWAIT) == 0)
3098 break; /* == ignore */
3104 * This signal has an action, let
3105 * postsig() process it.
3109 sigqueue_delete(&td->td_sigqueue, sig); /* take the signal! */
3110 sigqueue_delete(&p->p_sigqueue, sig);
3117 thread_stopped(struct proc *p)
3121 PROC_LOCK_ASSERT(p, MA_OWNED);
3122 PROC_SLOCK_ASSERT(p, MA_OWNED);
3126 if ((p->p_flag & P_STOPPED_SIG) && (n == p->p_numthreads)) {
3128 p->p_flag &= ~P_WAITED;
3129 PROC_LOCK(p->p_pptr);
3130 childproc_stopped(p, (p->p_flag & P_TRACED) ?
3131 CLD_TRAPPED : CLD_STOPPED);
3132 PROC_UNLOCK(p->p_pptr);
3138 * Take the action for the specified signal
3139 * from the current set of pending signals.
3149 sigset_t returnmask;
3151 KASSERT(sig != 0, ("postsig"));
3155 PROC_LOCK_ASSERT(p, MA_OWNED);
3157 mtx_assert(&ps->ps_mtx, MA_OWNED);
3158 ksiginfo_init(&ksi);
3159 if (sigqueue_get(&td->td_sigqueue, sig, &ksi) == 0 &&
3160 sigqueue_get(&p->p_sigqueue, sig, &ksi) == 0)
3162 ksi.ksi_signo = sig;
3163 if (ksi.ksi_code == SI_TIMER)
3164 itimer_accept(p, ksi.ksi_timerid, &ksi);
3165 action = ps->ps_sigact[_SIG_IDX(sig)];
3167 if (KTRPOINT(td, KTR_PSIG))
3168 ktrpsig(sig, action, td->td_pflags & TDP_OLDMASK ?
3169 &td->td_oldsigmask : &td->td_sigmask, ksi.ksi_code);
3172 if (action == SIG_DFL) {
3174 * Default action, where the default is to kill
3175 * the process. (Other cases were ignored above.)
3177 mtx_unlock(&ps->ps_mtx);
3178 proc_td_siginfo_capture(td, &ksi.ksi_info);
3183 * If we get here, the signal must be caught.
3185 KASSERT(action != SIG_IGN, ("postsig action %p", action));
3186 KASSERT(!SIGISMEMBER(td->td_sigmask, sig),
3187 ("postsig action: blocked sig %d", sig));
3190 * Set the new mask value and also defer further
3191 * occurrences of this signal.
3193 * Special case: user has done a sigsuspend. Here the
3194 * current mask is not of interest, but rather the
3195 * mask from before the sigsuspend is what we want
3196 * restored after the signal processing is completed.
3198 if (td->td_pflags & TDP_OLDMASK) {
3199 returnmask = td->td_oldsigmask;
3200 td->td_pflags &= ~TDP_OLDMASK;
3202 returnmask = td->td_sigmask;
3204 if (p->p_sig == sig) {
3207 (*p->p_sysent->sv_sendsig)(action, &ksi, &returnmask);
3208 postsig_done(sig, td, ps);
3214 sig_ast_checksusp(struct thread *td)
3220 PROC_LOCK_ASSERT(p, MA_OWNED);
3222 if ((td->td_flags & TDF_NEEDSUSPCHK) == 0)
3225 ret = thread_suspend_check(1);
3226 MPASS(ret == 0 || ret == EINTR || ret == ERESTART);
3231 sig_ast_needsigchk(struct thread *td)
3238 PROC_LOCK_ASSERT(p, MA_OWNED);
3240 if ((td->td_flags & TDF_NEEDSIGCHK) == 0)
3244 mtx_lock(&ps->ps_mtx);
3247 mtx_unlock(&ps->ps_mtx);
3248 KASSERT((td->td_flags & TDF_SBDRY) != 0, ("lost TDF_SBDRY"));
3249 KASSERT(TD_SBDRY_INTR(td),
3250 ("lost TDF_SERESTART of TDF_SEINTR"));
3251 KASSERT((td->td_flags & (TDF_SEINTR | TDF_SERESTART)) !=
3252 (TDF_SEINTR | TDF_SERESTART),
3253 ("both TDF_SEINTR and TDF_SERESTART"));
3254 ret = TD_SBDRY_ERRNO(td);
3255 } else if (sig != 0) {
3256 ret = SIGISMEMBER(ps->ps_sigintr, sig) ? EINTR : ERESTART;
3257 mtx_unlock(&ps->ps_mtx);
3259 mtx_unlock(&ps->ps_mtx);
3264 * Do not go into sleep if this thread was the ptrace(2)
3265 * attach leader. cursig() consumed SIGSTOP from PT_ATTACH,
3266 * but we usually act on the signal by interrupting sleep, and
3267 * should do that here as well.
3269 if ((td->td_dbgflags & TDB_FSTP) != 0) {
3272 td->td_dbgflags &= ~TDB_FSTP;
3286 if ((td->td_flags & (TDF_NEEDSIGCHK | TDF_NEEDSUSPCHK)) == 0)
3292 ret = sig_ast_checksusp(td);
3294 ret = sig_ast_needsigchk(td);
3300 proc_wkilled(struct proc *p)
3303 PROC_LOCK_ASSERT(p, MA_OWNED);
3304 if ((p->p_flag & P_WKILLED) == 0) {
3305 p->p_flag |= P_WKILLED;
3307 * Notify swapper that there is a process to swap in.
3308 * The notification is racy, at worst it would take 10
3309 * seconds for the swapper process to notice.
3311 if ((p->p_flag & (P_INMEM | P_SWAPPINGIN)) == 0)
3317 * Kill the current process for stated reason.
3320 killproc(struct proc *p, const char *why)
3323 PROC_LOCK_ASSERT(p, MA_OWNED);
3324 CTR3(KTR_PROC, "killproc: proc %p (pid %d, %s)", p, p->p_pid,
3326 log(LOG_ERR, "pid %d (%s), jid %d, uid %d, was killed: %s\n",
3327 p->p_pid, p->p_comm, p->p_ucred->cr_prison->pr_id,
3328 p->p_ucred->cr_uid, why);
3330 kern_psignal(p, SIGKILL);
3334 * Force the current process to exit with the specified signal, dumping core
3335 * if appropriate. We bypass the normal tests for masked and caught signals,
3336 * allowing unrecoverable failures to terminate the process without changing
3337 * signal state. Mark the accounting record with the signal termination.
3338 * If dumping core, save the signal number for the debugger. Calls exit and
3342 sigexit(struct thread *td, int sig)
3344 struct proc *p = td->td_proc;
3346 PROC_LOCK_ASSERT(p, MA_OWNED);
3347 p->p_acflag |= AXSIG;
3349 * We must be single-threading to generate a core dump. This
3350 * ensures that the registers in the core file are up-to-date.
3351 * Also, the ELF dump handler assumes that the thread list doesn't
3352 * change out from under it.
3354 * XXX If another thread attempts to single-thread before us
3355 * (e.g. via fork()), we won't get a dump at all.
3357 if ((sigprop(sig) & SIGPROP_CORE) &&
3358 thread_single(p, SINGLE_NO_EXIT) == 0) {
3361 * Log signals which would cause core dumps
3362 * (Log as LOG_INFO to appease those who don't want
3364 * XXX : Todo, as well as euid, write out ruid too
3365 * Note that coredump() drops proc lock.
3367 if (coredump(td) == 0)
3369 if (kern_logsigexit)
3371 "pid %d (%s), jid %d, uid %d: exited on "
3372 "signal %d%s\n", p->p_pid, p->p_comm,
3373 p->p_ucred->cr_prison->pr_id,
3374 td->td_ucred->cr_uid,
3376 sig & WCOREFLAG ? " (core dumped)" : "");
3384 * Send queued SIGCHLD to parent when child process's state
3388 sigparent(struct proc *p, int reason, int status)
3390 PROC_LOCK_ASSERT(p, MA_OWNED);
3391 PROC_LOCK_ASSERT(p->p_pptr, MA_OWNED);
3393 if (p->p_ksi != NULL) {
3394 p->p_ksi->ksi_signo = SIGCHLD;
3395 p->p_ksi->ksi_code = reason;
3396 p->p_ksi->ksi_status = status;
3397 p->p_ksi->ksi_pid = p->p_pid;
3398 p->p_ksi->ksi_uid = p->p_ucred->cr_ruid;
3399 if (KSI_ONQ(p->p_ksi))
3402 pksignal(p->p_pptr, SIGCHLD, p->p_ksi);
3406 childproc_jobstate(struct proc *p, int reason, int sig)
3410 PROC_LOCK_ASSERT(p, MA_OWNED);
3411 PROC_LOCK_ASSERT(p->p_pptr, MA_OWNED);
3414 * Wake up parent sleeping in kern_wait(), also send
3415 * SIGCHLD to parent, but SIGCHLD does not guarantee
3416 * that parent will awake, because parent may masked
3419 p->p_pptr->p_flag |= P_STATCHILD;
3422 ps = p->p_pptr->p_sigacts;
3423 mtx_lock(&ps->ps_mtx);
3424 if ((ps->ps_flag & PS_NOCLDSTOP) == 0) {
3425 mtx_unlock(&ps->ps_mtx);
3426 sigparent(p, reason, sig);
3428 mtx_unlock(&ps->ps_mtx);
3432 childproc_stopped(struct proc *p, int reason)
3435 childproc_jobstate(p, reason, p->p_xsig);
3439 childproc_continued(struct proc *p)
3441 childproc_jobstate(p, CLD_CONTINUED, SIGCONT);
3445 childproc_exited(struct proc *p)
3449 if (WCOREDUMP(p->p_xsig)) {
3450 reason = CLD_DUMPED;
3451 status = WTERMSIG(p->p_xsig);
3452 } else if (WIFSIGNALED(p->p_xsig)) {
3453 reason = CLD_KILLED;
3454 status = WTERMSIG(p->p_xsig);
3456 reason = CLD_EXITED;
3457 status = p->p_xexit;
3460 * XXX avoid calling wakeup(p->p_pptr), the work is
3463 sigparent(p, reason, status);
3466 #define MAX_NUM_CORE_FILES 100000
3467 #ifndef NUM_CORE_FILES
3468 #define NUM_CORE_FILES 5
3470 CTASSERT(NUM_CORE_FILES >= 0 && NUM_CORE_FILES <= MAX_NUM_CORE_FILES);
3471 static int num_cores = NUM_CORE_FILES;
3474 sysctl_debug_num_cores_check (SYSCTL_HANDLER_ARGS)
3479 new_val = num_cores;
3480 error = sysctl_handle_int(oidp, &new_val, 0, req);
3481 if (error != 0 || req->newptr == NULL)
3483 if (new_val > MAX_NUM_CORE_FILES)
3484 new_val = MAX_NUM_CORE_FILES;
3487 num_cores = new_val;
3490 SYSCTL_PROC(_debug, OID_AUTO, ncores,
3491 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 0, sizeof(int),
3492 sysctl_debug_num_cores_check, "I",
3493 "Maximum number of generated process corefiles while using index format");
3495 #define GZIP_SUFFIX ".gz"
3496 #define ZSTD_SUFFIX ".zst"
3498 int compress_user_cores = 0;
3501 sysctl_compress_user_cores(SYSCTL_HANDLER_ARGS)
3505 val = compress_user_cores;
3506 error = sysctl_handle_int(oidp, &val, 0, req);
3507 if (error != 0 || req->newptr == NULL)
3509 if (val != 0 && !compressor_avail(val))
3511 compress_user_cores = val;
3514 SYSCTL_PROC(_kern, OID_AUTO, compress_user_cores,
3515 CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_NEEDGIANT, 0, sizeof(int),
3516 sysctl_compress_user_cores, "I",
3517 "Enable compression of user corefiles ("
3518 __XSTRING(COMPRESS_GZIP) " = gzip, "
3519 __XSTRING(COMPRESS_ZSTD) " = zstd)");
3521 int compress_user_cores_level = 6;
3522 SYSCTL_INT(_kern, OID_AUTO, compress_user_cores_level, CTLFLAG_RWTUN,
3523 &compress_user_cores_level, 0,
3524 "Corefile compression level");
3527 * Protect the access to corefilename[] by allproc_lock.
3529 #define corefilename_lock allproc_lock
3531 static char corefilename[MAXPATHLEN] = {"%N.core"};
3532 TUNABLE_STR("kern.corefile", corefilename, sizeof(corefilename));
3535 sysctl_kern_corefile(SYSCTL_HANDLER_ARGS)
3539 sx_xlock(&corefilename_lock);
3540 error = sysctl_handle_string(oidp, corefilename, sizeof(corefilename),
3542 sx_xunlock(&corefilename_lock);
3546 SYSCTL_PROC(_kern, OID_AUTO, corefile, CTLTYPE_STRING | CTLFLAG_RW |
3547 CTLFLAG_MPSAFE, 0, 0, sysctl_kern_corefile, "A",
3548 "Process corefile name format string");
3551 vnode_close_locked(struct thread *td, struct vnode *vp)
3555 vn_close(vp, FWRITE, td->td_ucred, td);
3559 * If the core format has a %I in it, then we need to check
3560 * for existing corefiles before defining a name.
3561 * To do this we iterate over 0..ncores to find a
3562 * non-existing core file name to use. If all core files are
3563 * already used we choose the oldest one.
3566 corefile_open_last(struct thread *td, char *name, int indexpos,
3567 int indexlen, int ncores, struct vnode **vpp)
3569 struct vnode *oldvp, *nextvp, *vp;
3571 struct nameidata nd;
3572 int error, i, flags, oflags, cmode;
3574 struct timespec lasttime;
3576 nextvp = oldvp = NULL;
3577 cmode = S_IRUSR | S_IWUSR;
3578 oflags = VN_OPEN_NOAUDIT | VN_OPEN_NAMECACHE |
3579 (capmode_coredump ? VN_OPEN_NOCAPCHECK : 0);
3581 for (i = 0; i < ncores; i++) {
3582 flags = O_CREAT | FWRITE | O_NOFOLLOW;
3584 ch = name[indexpos + indexlen];
3585 (void)snprintf(name + indexpos, indexlen + 1, "%.*u", indexlen,
3587 name[indexpos + indexlen] = ch;
3589 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, td);
3590 error = vn_open_cred(&nd, &flags, cmode, oflags, td->td_ucred,
3596 NDFREE(&nd, NDF_ONLY_PNBUF);
3597 if ((flags & O_CREAT) == O_CREAT) {
3602 error = VOP_GETATTR(vp, &vattr, td->td_ucred);
3604 vnode_close_locked(td, vp);
3608 if (oldvp == NULL ||
3609 lasttime.tv_sec > vattr.va_mtime.tv_sec ||
3610 (lasttime.tv_sec == vattr.va_mtime.tv_sec &&
3611 lasttime.tv_nsec >= vattr.va_mtime.tv_nsec)) {
3613 vn_close(oldvp, FWRITE, td->td_ucred, td);
3616 lasttime = vattr.va_mtime;
3618 vnode_close_locked(td, vp);
3622 if (oldvp != NULL) {
3623 if (nextvp == NULL) {
3624 if ((td->td_proc->p_flag & P_SUGID) != 0) {
3626 vn_close(oldvp, FWRITE, td->td_ucred, td);
3629 error = vn_lock(nextvp, LK_EXCLUSIVE);
3631 vn_close(nextvp, FWRITE, td->td_ucred,
3637 vn_close(oldvp, FWRITE, td->td_ucred, td);
3642 vnode_close_locked(td, oldvp);
3651 * corefile_open(comm, uid, pid, td, compress, vpp, namep)
3652 * Expand the name described in corefilename, using name, uid, and pid
3653 * and open/create core file.
3654 * corefilename is a printf-like string, with three format specifiers:
3655 * %N name of process ("name")
3656 * %P process id (pid)
3658 * For example, "%N.core" is the default; they can be disabled completely
3659 * by using "/dev/null", or all core files can be stored in "/cores/%U/%N-%P".
3660 * This is controlled by the sysctl variable kern.corefile (see above).
3663 corefile_open(const char *comm, uid_t uid, pid_t pid, struct thread *td,
3664 int compress, int signum, struct vnode **vpp, char **namep)
3667 struct nameidata nd;
3669 char *hostname, *name;
3670 int cmode, error, flags, i, indexpos, indexlen, oflags, ncores;
3673 format = corefilename;
3674 name = malloc(MAXPATHLEN, M_TEMP, M_WAITOK | M_ZERO);
3678 (void)sbuf_new(&sb, name, MAXPATHLEN, SBUF_FIXEDLEN);
3679 sx_slock(&corefilename_lock);
3680 for (i = 0; format[i] != '\0'; i++) {
3681 switch (format[i]) {
3682 case '%': /* Format character */
3684 switch (format[i]) {
3686 sbuf_putc(&sb, '%');
3688 case 'H': /* hostname */
3689 if (hostname == NULL) {
3690 hostname = malloc(MAXHOSTNAMELEN,
3693 getcredhostname(td->td_ucred, hostname,
3695 sbuf_printf(&sb, "%s", hostname);
3697 case 'I': /* autoincrementing index */
3698 if (indexpos != -1) {
3699 sbuf_printf(&sb, "%%I");
3703 indexpos = sbuf_len(&sb);
3704 sbuf_printf(&sb, "%u", ncores - 1);
3705 indexlen = sbuf_len(&sb) - indexpos;
3707 case 'N': /* process name */
3708 sbuf_printf(&sb, "%s", comm);
3710 case 'P': /* process id */
3711 sbuf_printf(&sb, "%u", pid);
3713 case 'S': /* signal number */
3714 sbuf_printf(&sb, "%i", signum);
3716 case 'U': /* user id */
3717 sbuf_printf(&sb, "%u", uid);
3721 "Unknown format character %c in "
3722 "corename `%s'\n", format[i], format);
3727 sbuf_putc(&sb, format[i]);
3731 sx_sunlock(&corefilename_lock);
3732 free(hostname, M_TEMP);
3733 if (compress == COMPRESS_GZIP)
3734 sbuf_printf(&sb, GZIP_SUFFIX);
3735 else if (compress == COMPRESS_ZSTD)
3736 sbuf_printf(&sb, ZSTD_SUFFIX);
3737 if (sbuf_error(&sb) != 0) {
3738 log(LOG_ERR, "pid %ld (%s), uid (%lu): corename is too "
3739 "long\n", (long)pid, comm, (u_long)uid);
3747 if (indexpos != -1) {
3748 error = corefile_open_last(td, name, indexpos, indexlen, ncores,
3752 "pid %d (%s), uid (%u): Path `%s' failed "
3753 "on initial open test, error = %d\n",
3754 pid, comm, uid, name, error);
3757 cmode = S_IRUSR | S_IWUSR;
3758 oflags = VN_OPEN_NOAUDIT | VN_OPEN_NAMECACHE |
3759 (capmode_coredump ? VN_OPEN_NOCAPCHECK : 0);
3760 flags = O_CREAT | FWRITE | O_NOFOLLOW;
3761 if ((td->td_proc->p_flag & P_SUGID) != 0)
3764 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, td);
3765 error = vn_open_cred(&nd, &flags, cmode, oflags, td->td_ucred,
3769 NDFREE(&nd, NDF_ONLY_PNBUF);
3775 audit_proc_coredump(td, name, error);
3785 * Dump a process' core. The main routine does some
3786 * policy checking, and creates the name of the coredump;
3787 * then it passes on a vnode and a size limit to the process-specific
3788 * coredump routine if there is one; if there _is not_ one, it returns
3789 * ENOSYS; otherwise it returns the error from the process-specific routine.
3793 coredump(struct thread *td)
3795 struct proc *p = td->td_proc;
3796 struct ucred *cred = td->td_ucred;
3800 size_t fullpathsize;
3801 int error, error1, locked;
3802 char *name; /* name of corefile */
3805 char *fullpath, *freepath = NULL;
3808 PROC_LOCK_ASSERT(p, MA_OWNED);
3809 MPASS((p->p_flag & P_HADTHREADS) == 0 || p->p_singlethread == td);
3811 if (!do_coredump || (!sugid_coredump && (p->p_flag & P_SUGID) != 0) ||
3812 (p->p_flag2 & P2_NOTRACE) != 0) {
3818 * Note that the bulk of limit checking is done after
3819 * the corefile is created. The exception is if the limit
3820 * for corefiles is 0, in which case we don't bother
3821 * creating the corefile at all. This layout means that
3822 * a corefile is truncated instead of not being created,
3823 * if it is larger than the limit.
3825 limit = (off_t)lim_cur(td, RLIMIT_CORE);
3826 if (limit == 0 || racct_get_available(p, RACCT_CORE) == 0) {
3832 error = corefile_open(p->p_comm, cred->cr_uid, p->p_pid, td,
3833 compress_user_cores, p->p_sig, &vp, &name);
3838 * Don't dump to non-regular files or files with links.
3839 * Do not dump into system files. Effective user must own the corefile.
3841 if (vp->v_type != VREG || VOP_GETATTR(vp, &vattr, cred) != 0 ||
3842 vattr.va_nlink != 1 || (vp->v_vflag & VV_SYSTEM) != 0 ||
3843 vattr.va_uid != cred->cr_uid) {
3851 /* Postpone other writers, including core dumps of other processes. */
3852 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
3854 lf.l_whence = SEEK_SET;
3857 lf.l_type = F_WRLCK;
3858 locked = (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &lf, F_FLOCK) == 0);
3862 if (set_core_nodump_flag)
3863 vattr.va_flags = UF_NODUMP;
3864 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3865 VOP_SETATTR(vp, &vattr, cred);
3868 p->p_acflag |= ACORE;
3871 if (p->p_sysent->sv_coredump != NULL) {
3872 error = p->p_sysent->sv_coredump(td, vp, limit, 0);
3878 lf.l_type = F_UNLCK;
3879 VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK);
3881 vn_rangelock_unlock(vp, rl_cookie);
3884 * Notify the userland helper that a process triggered a core dump.
3885 * This allows the helper to run an automated debugging session.
3887 if (error != 0 || coredump_devctl == 0)
3889 sb = sbuf_new_auto();
3890 if (vn_fullpath_global(p->p_textvp, &fullpath, &freepath) != 0)
3892 sbuf_printf(sb, "comm=\"");
3893 devctl_safe_quote_sb(sb, fullpath);
3894 free(freepath, M_TEMP);
3895 sbuf_printf(sb, "\" core=\"");
3898 * We can't lookup core file vp directly. When we're replacing a core, and
3899 * other random times, we flush the name cache, so it will fail. Instead,
3900 * if the path of the core is relative, add the current dir in front if it.
3902 if (name[0] != '/') {
3903 fullpathsize = MAXPATHLEN;
3904 freepath = malloc(fullpathsize, M_TEMP, M_WAITOK);
3905 if (vn_getcwd(freepath, &fullpath, &fullpathsize) != 0) {
3906 free(freepath, M_TEMP);
3909 devctl_safe_quote_sb(sb, fullpath);
3910 free(freepath, M_TEMP);
3913 devctl_safe_quote_sb(sb, name);
3914 sbuf_printf(sb, "\"");
3915 if (sbuf_finish(sb) == 0)
3916 devctl_notify("kernel", "signal", "coredump", sbuf_data(sb));
3920 error1 = vn_close(vp, FWRITE, cred, td);
3924 audit_proc_coredump(td, name, error);
3931 * Nonexistent system call-- signal process (may want to handle it). Flag
3932 * error in case process won't see signal immediately (blocked or ignored).
3934 #ifndef _SYS_SYSPROTO_H_
3941 nosys(struct thread *td, struct nosys_args *args)
3948 tdsignal(td, SIGSYS);
3950 if (kern_lognosys == 1 || kern_lognosys == 3) {
3951 uprintf("pid %d comm %s: nosys %d\n", p->p_pid, p->p_comm,
3954 if (kern_lognosys == 2 || kern_lognosys == 3 ||
3955 (p->p_pid == 1 && (kern_lognosys & 3) == 0)) {
3956 printf("pid %d comm %s: nosys %d\n", p->p_pid, p->p_comm,
3963 * Send a SIGIO or SIGURG signal to a process or process group using stored
3964 * credentials rather than those of the current process.
3967 pgsigio(struct sigio **sigiop, int sig, int checkctty)
3970 struct sigio *sigio;
3972 ksiginfo_init(&ksi);
3973 ksi.ksi_signo = sig;
3974 ksi.ksi_code = SI_KERNEL;
3978 if (sigio == NULL) {
3982 if (sigio->sio_pgid > 0) {
3983 PROC_LOCK(sigio->sio_proc);
3984 if (CANSIGIO(sigio->sio_ucred, sigio->sio_proc->p_ucred))
3985 kern_psignal(sigio->sio_proc, sig);
3986 PROC_UNLOCK(sigio->sio_proc);
3987 } else if (sigio->sio_pgid < 0) {
3990 PGRP_LOCK(sigio->sio_pgrp);
3991 LIST_FOREACH(p, &sigio->sio_pgrp->pg_members, p_pglist) {
3993 if (p->p_state == PRS_NORMAL &&
3994 CANSIGIO(sigio->sio_ucred, p->p_ucred) &&
3995 (checkctty == 0 || (p->p_flag & P_CONTROLT)))
3996 kern_psignal(p, sig);
3999 PGRP_UNLOCK(sigio->sio_pgrp);
4005 filt_sigattach(struct knote *kn)
4007 struct proc *p = curproc;
4009 kn->kn_ptr.p_proc = p;
4010 kn->kn_flags |= EV_CLEAR; /* automatically set */
4012 knlist_add(p->p_klist, kn, 0);
4018 filt_sigdetach(struct knote *kn)
4020 struct proc *p = kn->kn_ptr.p_proc;
4022 knlist_remove(p->p_klist, kn, 0);
4026 * signal knotes are shared with proc knotes, so we apply a mask to
4027 * the hint in order to differentiate them from process hints. This
4028 * could be avoided by using a signal-specific knote list, but probably
4029 * isn't worth the trouble.
4032 filt_signal(struct knote *kn, long hint)
4035 if (hint & NOTE_SIGNAL) {
4036 hint &= ~NOTE_SIGNAL;
4038 if (kn->kn_id == hint)
4041 return (kn->kn_data != 0);
4049 ps = malloc(sizeof(struct sigacts), M_SUBPROC, M_WAITOK | M_ZERO);
4050 refcount_init(&ps->ps_refcnt, 1);
4051 mtx_init(&ps->ps_mtx, "sigacts", NULL, MTX_DEF);
4056 sigacts_free(struct sigacts *ps)
4059 if (refcount_release(&ps->ps_refcnt) == 0)
4061 mtx_destroy(&ps->ps_mtx);
4062 free(ps, M_SUBPROC);
4066 sigacts_hold(struct sigacts *ps)
4069 refcount_acquire(&ps->ps_refcnt);
4074 sigacts_copy(struct sigacts *dest, struct sigacts *src)
4077 KASSERT(dest->ps_refcnt == 1, ("sigacts_copy to shared dest"));
4078 mtx_lock(&src->ps_mtx);
4079 bcopy(src, dest, offsetof(struct sigacts, ps_refcnt));
4080 mtx_unlock(&src->ps_mtx);
4084 sigacts_shared(struct sigacts *ps)
4087 return (ps->ps_refcnt > 1);
4091 sig_drop_caught(struct proc *p)
4097 PROC_LOCK_ASSERT(p, MA_OWNED);
4098 mtx_assert(&ps->ps_mtx, MA_OWNED);
4099 while (SIGNOTEMPTY(ps->ps_sigcatch)) {
4100 sig = sig_ffs(&ps->ps_sigcatch);
4102 if ((sigprop(sig) & SIGPROP_IGNORE) != 0)
4103 sigqueue_delete_proc(p, sig);
4108 sigfastblock_failed(struct thread *td, bool sendsig, bool write)
4113 * Prevent further fetches and SIGSEGVs, allowing thread to
4114 * issue syscalls despite corruption.
4116 sigfastblock_clear(td);
4120 ksiginfo_init_trap(&ksi);
4121 ksi.ksi_signo = SIGSEGV;
4122 ksi.ksi_code = write ? SEGV_ACCERR : SEGV_MAPERR;
4123 ksi.ksi_addr = td->td_sigblock_ptr;
4124 trapsignal(td, &ksi);
4128 sigfastblock_fetch_sig(struct thread *td, bool sendsig, uint32_t *valp)
4132 if ((td->td_pflags & TDP_SIGFASTBLOCK) == 0)
4134 if (fueword32((void *)td->td_sigblock_ptr, &res) == -1) {
4135 sigfastblock_failed(td, sendsig, false);
4139 td->td_sigblock_val = res & ~SIGFASTBLOCK_FLAGS;
4144 sigfastblock_resched(struct thread *td, bool resched)
4151 reschedule_signals(p, td->td_sigmask, 0);
4155 td->td_flags |= TDF_ASTPENDING | TDF_NEEDSIGCHK;
4160 sys_sigfastblock(struct thread *td, struct sigfastblock_args *uap)
4169 case SIGFASTBLOCK_SETPTR:
4170 if ((td->td_pflags & TDP_SIGFASTBLOCK) != 0) {
4174 if (((uintptr_t)(uap->ptr) & (sizeof(uint32_t) - 1)) != 0) {
4178 td->td_pflags |= TDP_SIGFASTBLOCK;
4179 td->td_sigblock_ptr = uap->ptr;
4182 case SIGFASTBLOCK_UNBLOCK:
4183 if ((td->td_pflags & TDP_SIGFASTBLOCK) == 0) {
4189 res = casueword32(td->td_sigblock_ptr,
4190 SIGFASTBLOCK_PEND, &oldval, 0);
4193 sigfastblock_failed(td, false, true);
4199 if (oldval != SIGFASTBLOCK_PEND) {
4203 error = thread_check_susp(td, false);
4211 * td_sigblock_val is cleared there, but not on a
4212 * syscall exit. The end effect is that a single
4213 * interruptible sleep, while user sigblock word is
4214 * set, might return EINTR or ERESTART to usermode
4215 * without delivering signal. All further sleeps,
4216 * until userspace clears the word and does
4217 * sigfastblock(UNBLOCK), observe current word and no
4218 * longer get interrupted. It is slight
4219 * non-conformance, with alternative to have read the
4220 * sigblock word on each syscall entry.
4222 td->td_sigblock_val = 0;
4225 * Rely on normal ast mechanism to deliver pending
4226 * signals to current thread. But notify others about
4229 sigfastblock_resched(td, error == 0 && p->p_numthreads != 1);
4233 case SIGFASTBLOCK_UNSETPTR:
4234 if ((td->td_pflags & TDP_SIGFASTBLOCK) == 0) {
4238 if (!sigfastblock_fetch_sig(td, false, &oldval)) {
4242 if (oldval != 0 && oldval != SIGFASTBLOCK_PEND) {
4246 sigfastblock_clear(td);
4257 sigfastblock_clear(struct thread *td)
4261 if ((td->td_pflags & TDP_SIGFASTBLOCK) == 0)
4263 td->td_sigblock_val = 0;
4264 resched = (td->td_pflags & TDP_SIGFASTPENDING) != 0 ||
4266 td->td_pflags &= ~(TDP_SIGFASTBLOCK | TDP_SIGFASTPENDING);
4267 sigfastblock_resched(td, resched);
4271 sigfastblock_fetch(struct thread *td)
4275 (void)sigfastblock_fetch_sig(td, true, &val);
4279 sigfastblock_setpend1(struct thread *td)
4284 if ((td->td_pflags & TDP_SIGFASTPENDING) == 0)
4286 res = fueword32((void *)td->td_sigblock_ptr, &oldval);
4288 sigfastblock_failed(td, true, false);
4292 res = casueword32(td->td_sigblock_ptr, oldval, &oldval,
4293 oldval | SIGFASTBLOCK_PEND);
4295 sigfastblock_failed(td, true, true);
4299 td->td_sigblock_val = oldval & ~SIGFASTBLOCK_FLAGS;
4300 td->td_pflags &= ~TDP_SIGFASTPENDING;
4304 if (thread_check_susp(td, false) != 0)
4310 sigfastblock_setpend(struct thread *td, bool resched)
4314 sigfastblock_setpend1(td);
4318 reschedule_signals(p, fastblock_mask, SIGPROCMASK_FASTBLK);