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
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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 */
217 #define SIGPROP_CANTMASK 0x40 /* non-maskable, catchable */
219 static int sigproptbl[NSIG] = {
220 [SIGHUP] = SIGPROP_KILL,
221 [SIGINT] = SIGPROP_KILL,
222 [SIGQUIT] = SIGPROP_KILL | SIGPROP_CORE,
223 [SIGILL] = SIGPROP_KILL | SIGPROP_CORE,
224 [SIGTRAP] = SIGPROP_KILL | SIGPROP_CORE,
225 [SIGABRT] = SIGPROP_KILL | SIGPROP_CORE,
226 [SIGEMT] = SIGPROP_KILL | SIGPROP_CORE,
227 [SIGFPE] = SIGPROP_KILL | SIGPROP_CORE,
228 [SIGKILL] = SIGPROP_KILL,
229 [SIGBUS] = SIGPROP_KILL | SIGPROP_CORE,
230 [SIGSEGV] = SIGPROP_KILL | SIGPROP_CORE,
231 [SIGSYS] = SIGPROP_KILL | SIGPROP_CORE,
232 [SIGPIPE] = SIGPROP_KILL,
233 [SIGALRM] = SIGPROP_KILL,
234 [SIGTERM] = SIGPROP_KILL,
235 [SIGURG] = SIGPROP_IGNORE,
236 [SIGSTOP] = SIGPROP_STOP,
237 [SIGTSTP] = SIGPROP_STOP | SIGPROP_TTYSTOP,
238 [SIGCONT] = SIGPROP_IGNORE | SIGPROP_CONT,
239 [SIGCHLD] = SIGPROP_IGNORE,
240 [SIGTTIN] = SIGPROP_STOP | SIGPROP_TTYSTOP,
241 [SIGTTOU] = SIGPROP_STOP | SIGPROP_TTYSTOP,
242 [SIGIO] = SIGPROP_IGNORE,
243 [SIGXCPU] = SIGPROP_KILL,
244 [SIGXFSZ] = SIGPROP_KILL,
245 [SIGVTALRM] = SIGPROP_KILL,
246 [SIGPROF] = SIGPROP_KILL,
247 [SIGWINCH] = SIGPROP_IGNORE,
248 [SIGINFO] = SIGPROP_IGNORE,
249 [SIGUSR1] = SIGPROP_KILL,
250 [SIGUSR2] = SIGPROP_KILL,
253 sigset_t fastblock_mask;
258 ksiginfo_zone = uma_zcreate("ksiginfo", sizeof(ksiginfo_t),
259 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
260 uma_prealloc(ksiginfo_zone, preallocate_siginfo);
261 p31b_setcfg(CTL_P1003_1B_REALTIME_SIGNALS, _POSIX_REALTIME_SIGNALS);
262 p31b_setcfg(CTL_P1003_1B_RTSIG_MAX, SIGRTMAX - SIGRTMIN + 1);
263 p31b_setcfg(CTL_P1003_1B_SIGQUEUE_MAX, max_pending_per_proc);
264 SIGFILLSET(fastblock_mask);
265 SIG_CANTMASK(fastblock_mask);
269 ksiginfo_alloc(int wait)
276 if (ksiginfo_zone != NULL)
277 return ((ksiginfo_t *)uma_zalloc(ksiginfo_zone, flags));
282 ksiginfo_free(ksiginfo_t *ksi)
284 uma_zfree(ksiginfo_zone, ksi);
288 ksiginfo_tryfree(ksiginfo_t *ksi)
290 if (!(ksi->ksi_flags & KSI_EXT)) {
291 uma_zfree(ksiginfo_zone, ksi);
298 sigqueue_init(sigqueue_t *list, struct proc *p)
300 SIGEMPTYSET(list->sq_signals);
301 SIGEMPTYSET(list->sq_kill);
302 SIGEMPTYSET(list->sq_ptrace);
303 TAILQ_INIT(&list->sq_list);
305 list->sq_flags = SQ_INIT;
309 * Get a signal's ksiginfo.
311 * 0 - signal not found
312 * others - signal number
315 sigqueue_get(sigqueue_t *sq, int signo, ksiginfo_t *si)
317 struct proc *p = sq->sq_proc;
318 struct ksiginfo *ksi, *next;
321 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
323 if (!SIGISMEMBER(sq->sq_signals, signo))
326 if (SIGISMEMBER(sq->sq_ptrace, signo)) {
328 SIGDELSET(sq->sq_ptrace, signo);
329 si->ksi_flags |= KSI_PTRACE;
331 if (SIGISMEMBER(sq->sq_kill, signo)) {
334 SIGDELSET(sq->sq_kill, signo);
337 TAILQ_FOREACH_SAFE(ksi, &sq->sq_list, ksi_link, next) {
338 if (ksi->ksi_signo == signo) {
340 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
341 ksi->ksi_sigq = NULL;
342 ksiginfo_copy(ksi, si);
343 if (ksiginfo_tryfree(ksi) && p != NULL)
352 SIGDELSET(sq->sq_signals, signo);
353 si->ksi_signo = signo;
358 sigqueue_take(ksiginfo_t *ksi)
364 if (ksi == NULL || (sq = ksi->ksi_sigq) == NULL)
368 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
369 ksi->ksi_sigq = NULL;
370 if (!(ksi->ksi_flags & KSI_EXT) && p != NULL)
373 for (kp = TAILQ_FIRST(&sq->sq_list); kp != NULL;
374 kp = TAILQ_NEXT(kp, ksi_link)) {
375 if (kp->ksi_signo == ksi->ksi_signo)
378 if (kp == NULL && !SIGISMEMBER(sq->sq_kill, ksi->ksi_signo) &&
379 !SIGISMEMBER(sq->sq_ptrace, ksi->ksi_signo))
380 SIGDELSET(sq->sq_signals, ksi->ksi_signo);
384 sigqueue_add(sigqueue_t *sq, int signo, ksiginfo_t *si)
386 struct proc *p = sq->sq_proc;
387 struct ksiginfo *ksi;
390 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
393 * SIGKILL/SIGSTOP cannot be caught or masked, so take the fast path
396 if (signo == SIGKILL || signo == SIGSTOP || si == NULL) {
397 SIGADDSET(sq->sq_kill, signo);
401 /* directly insert the ksi, don't copy it */
402 if (si->ksi_flags & KSI_INS) {
403 if (si->ksi_flags & KSI_HEAD)
404 TAILQ_INSERT_HEAD(&sq->sq_list, si, ksi_link);
406 TAILQ_INSERT_TAIL(&sq->sq_list, si, ksi_link);
411 if (__predict_false(ksiginfo_zone == NULL)) {
412 SIGADDSET(sq->sq_kill, signo);
416 if (p != NULL && p->p_pendingcnt >= max_pending_per_proc) {
419 } else if ((ksi = ksiginfo_alloc(0)) == NULL) {
425 ksiginfo_copy(si, ksi);
426 ksi->ksi_signo = signo;
427 if (si->ksi_flags & KSI_HEAD)
428 TAILQ_INSERT_HEAD(&sq->sq_list, ksi, ksi_link);
430 TAILQ_INSERT_TAIL(&sq->sq_list, ksi, ksi_link);
435 if ((si->ksi_flags & KSI_PTRACE) != 0) {
436 SIGADDSET(sq->sq_ptrace, signo);
439 } else if ((si->ksi_flags & KSI_TRAP) != 0 ||
440 (si->ksi_flags & KSI_SIGQ) == 0) {
441 SIGADDSET(sq->sq_kill, signo);
449 SIGADDSET(sq->sq_signals, signo);
454 sigqueue_flush(sigqueue_t *sq)
456 struct proc *p = sq->sq_proc;
459 KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));
462 PROC_LOCK_ASSERT(p, MA_OWNED);
464 while ((ksi = TAILQ_FIRST(&sq->sq_list)) != NULL) {
465 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
466 ksi->ksi_sigq = NULL;
467 if (ksiginfo_tryfree(ksi) && p != NULL)
471 SIGEMPTYSET(sq->sq_signals);
472 SIGEMPTYSET(sq->sq_kill);
473 SIGEMPTYSET(sq->sq_ptrace);
477 sigqueue_move_set(sigqueue_t *src, sigqueue_t *dst, const sigset_t *set)
480 struct proc *p1, *p2;
481 ksiginfo_t *ksi, *next;
483 KASSERT(src->sq_flags & SQ_INIT, ("src sigqueue not inited"));
484 KASSERT(dst->sq_flags & SQ_INIT, ("dst sigqueue not inited"));
487 /* Move siginfo to target list */
488 TAILQ_FOREACH_SAFE(ksi, &src->sq_list, ksi_link, next) {
489 if (SIGISMEMBER(*set, ksi->ksi_signo)) {
490 TAILQ_REMOVE(&src->sq_list, ksi, ksi_link);
493 TAILQ_INSERT_TAIL(&dst->sq_list, ksi, ksi_link);
500 /* Move pending bits to target list */
502 SIGSETAND(tmp, *set);
503 SIGSETOR(dst->sq_kill, tmp);
504 SIGSETNAND(src->sq_kill, tmp);
506 tmp = src->sq_ptrace;
507 SIGSETAND(tmp, *set);
508 SIGSETOR(dst->sq_ptrace, tmp);
509 SIGSETNAND(src->sq_ptrace, tmp);
511 tmp = src->sq_signals;
512 SIGSETAND(tmp, *set);
513 SIGSETOR(dst->sq_signals, tmp);
514 SIGSETNAND(src->sq_signals, tmp);
519 sigqueue_move(sigqueue_t *src, sigqueue_t *dst, int signo)
524 SIGADDSET(set, signo);
525 sigqueue_move_set(src, dst, &set);
530 sigqueue_delete_set(sigqueue_t *sq, const sigset_t *set)
532 struct proc *p = sq->sq_proc;
533 ksiginfo_t *ksi, *next;
535 KASSERT(sq->sq_flags & SQ_INIT, ("src sigqueue not inited"));
537 /* Remove siginfo queue */
538 TAILQ_FOREACH_SAFE(ksi, &sq->sq_list, ksi_link, next) {
539 if (SIGISMEMBER(*set, ksi->ksi_signo)) {
540 TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
541 ksi->ksi_sigq = NULL;
542 if (ksiginfo_tryfree(ksi) && p != NULL)
546 SIGSETNAND(sq->sq_kill, *set);
547 SIGSETNAND(sq->sq_ptrace, *set);
548 SIGSETNAND(sq->sq_signals, *set);
552 sigqueue_delete(sigqueue_t *sq, int signo)
557 SIGADDSET(set, signo);
558 sigqueue_delete_set(sq, &set);
561 /* Remove a set of signals for a process */
563 sigqueue_delete_set_proc(struct proc *p, const sigset_t *set)
568 PROC_LOCK_ASSERT(p, MA_OWNED);
570 sigqueue_init(&worklist, NULL);
571 sigqueue_move_set(&p->p_sigqueue, &worklist, set);
573 FOREACH_THREAD_IN_PROC(p, td0)
574 sigqueue_move_set(&td0->td_sigqueue, &worklist, set);
576 sigqueue_flush(&worklist);
580 sigqueue_delete_proc(struct proc *p, int signo)
585 SIGADDSET(set, signo);
586 sigqueue_delete_set_proc(p, &set);
590 sigqueue_delete_stopmask_proc(struct proc *p)
595 SIGADDSET(set, SIGSTOP);
596 SIGADDSET(set, SIGTSTP);
597 SIGADDSET(set, SIGTTIN);
598 SIGADDSET(set, SIGTTOU);
599 sigqueue_delete_set_proc(p, &set);
603 * Determine signal that should be delivered to thread td, the current
604 * thread, 0 if none. If there is a pending stop signal with default
605 * action, the process stops in issignal().
608 cursig(struct thread *td)
610 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
611 mtx_assert(&td->td_proc->p_sigacts->ps_mtx, MA_OWNED);
612 THREAD_LOCK_ASSERT(td, MA_NOTOWNED);
613 return (SIGPENDING(td) ? issignal(td) : 0);
617 * Arrange for ast() to handle unmasked pending signals on return to user
618 * mode. This must be called whenever a signal is added to td_sigqueue or
619 * unmasked in td_sigmask.
622 signotify(struct thread *td)
625 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
627 if (SIGPENDING(td)) {
629 td->td_flags |= TDF_NEEDSIGCHK | TDF_ASTPENDING;
635 * Returns 1 (true) if altstack is configured for the thread, and the
636 * passed stack bottom address falls into the altstack range. Handles
637 * the 43 compat special case where the alt stack size is zero.
640 sigonstack(size_t sp)
645 if ((td->td_pflags & TDP_ALTSTACK) == 0)
647 #if defined(COMPAT_43)
648 if (SV_PROC_FLAG(td->td_proc, SV_AOUT) && td->td_sigstk.ss_size == 0)
649 return ((td->td_sigstk.ss_flags & SS_ONSTACK) != 0);
651 return (sp >= (size_t)td->td_sigstk.ss_sp &&
652 sp < td->td_sigstk.ss_size + (size_t)td->td_sigstk.ss_sp);
659 if (sig > 0 && sig < nitems(sigproptbl))
660 return (sigproptbl[sig]);
665 sig_ffs(sigset_t *set)
669 for (i = 0; i < _SIG_WORDS; i++)
671 return (ffs(set->__bits[i]) + (i * 32));
676 sigact_flag_test(const struct sigaction *act, int flag)
680 * SA_SIGINFO is reset when signal disposition is set to
681 * ignore or default. Other flags are kept according to user
684 return ((act->sa_flags & flag) != 0 && (flag != SA_SIGINFO ||
685 ((__sighandler_t *)act->sa_sigaction != SIG_IGN &&
686 (__sighandler_t *)act->sa_sigaction != SIG_DFL)));
696 kern_sigaction(struct thread *td, int sig, const struct sigaction *act,
697 struct sigaction *oact, int flags)
700 struct proc *p = td->td_proc;
702 if (!_SIG_VALID(sig))
704 if (act != NULL && act->sa_handler != SIG_DFL &&
705 act->sa_handler != SIG_IGN && (act->sa_flags & ~(SA_ONSTACK |
706 SA_RESTART | SA_RESETHAND | SA_NOCLDSTOP | SA_NODEFER |
707 SA_NOCLDWAIT | SA_SIGINFO)) != 0)
712 mtx_lock(&ps->ps_mtx);
714 memset(oact, 0, sizeof(*oact));
715 oact->sa_mask = ps->ps_catchmask[_SIG_IDX(sig)];
716 if (SIGISMEMBER(ps->ps_sigonstack, sig))
717 oact->sa_flags |= SA_ONSTACK;
718 if (!SIGISMEMBER(ps->ps_sigintr, sig))
719 oact->sa_flags |= SA_RESTART;
720 if (SIGISMEMBER(ps->ps_sigreset, sig))
721 oact->sa_flags |= SA_RESETHAND;
722 if (SIGISMEMBER(ps->ps_signodefer, sig))
723 oact->sa_flags |= SA_NODEFER;
724 if (SIGISMEMBER(ps->ps_siginfo, sig)) {
725 oact->sa_flags |= SA_SIGINFO;
727 (__siginfohandler_t *)ps->ps_sigact[_SIG_IDX(sig)];
729 oact->sa_handler = ps->ps_sigact[_SIG_IDX(sig)];
730 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDSTOP)
731 oact->sa_flags |= SA_NOCLDSTOP;
732 if (sig == SIGCHLD && ps->ps_flag & PS_NOCLDWAIT)
733 oact->sa_flags |= SA_NOCLDWAIT;
736 if ((sig == SIGKILL || sig == SIGSTOP) &&
737 act->sa_handler != SIG_DFL) {
738 mtx_unlock(&ps->ps_mtx);
744 * Change setting atomically.
747 ps->ps_catchmask[_SIG_IDX(sig)] = act->sa_mask;
748 SIG_CANTMASK(ps->ps_catchmask[_SIG_IDX(sig)]);
749 if (sigact_flag_test(act, SA_SIGINFO)) {
750 ps->ps_sigact[_SIG_IDX(sig)] =
751 (__sighandler_t *)act->sa_sigaction;
752 SIGADDSET(ps->ps_siginfo, sig);
754 ps->ps_sigact[_SIG_IDX(sig)] = act->sa_handler;
755 SIGDELSET(ps->ps_siginfo, sig);
757 if (!sigact_flag_test(act, SA_RESTART))
758 SIGADDSET(ps->ps_sigintr, sig);
760 SIGDELSET(ps->ps_sigintr, sig);
761 if (sigact_flag_test(act, SA_ONSTACK))
762 SIGADDSET(ps->ps_sigonstack, sig);
764 SIGDELSET(ps->ps_sigonstack, sig);
765 if (sigact_flag_test(act, SA_RESETHAND))
766 SIGADDSET(ps->ps_sigreset, sig);
768 SIGDELSET(ps->ps_sigreset, sig);
769 if (sigact_flag_test(act, SA_NODEFER))
770 SIGADDSET(ps->ps_signodefer, sig);
772 SIGDELSET(ps->ps_signodefer, sig);
773 if (sig == SIGCHLD) {
774 if (act->sa_flags & SA_NOCLDSTOP)
775 ps->ps_flag |= PS_NOCLDSTOP;
777 ps->ps_flag &= ~PS_NOCLDSTOP;
778 if (act->sa_flags & SA_NOCLDWAIT) {
780 * Paranoia: since SA_NOCLDWAIT is implemented
781 * by reparenting the dying child to PID 1 (and
782 * trust it to reap the zombie), PID 1 itself
783 * is forbidden to set SA_NOCLDWAIT.
786 ps->ps_flag &= ~PS_NOCLDWAIT;
788 ps->ps_flag |= PS_NOCLDWAIT;
790 ps->ps_flag &= ~PS_NOCLDWAIT;
791 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN)
792 ps->ps_flag |= PS_CLDSIGIGN;
794 ps->ps_flag &= ~PS_CLDSIGIGN;
797 * Set bit in ps_sigignore for signals that are set to SIG_IGN,
798 * and for signals set to SIG_DFL where the default is to
799 * ignore. However, don't put SIGCONT in ps_sigignore, as we
800 * have to restart the process.
802 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
803 (sigprop(sig) & SIGPROP_IGNORE &&
804 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)) {
805 /* never to be seen again */
806 sigqueue_delete_proc(p, sig);
808 /* easier in psignal */
809 SIGADDSET(ps->ps_sigignore, sig);
810 SIGDELSET(ps->ps_sigcatch, sig);
812 SIGDELSET(ps->ps_sigignore, sig);
813 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL)
814 SIGDELSET(ps->ps_sigcatch, sig);
816 SIGADDSET(ps->ps_sigcatch, sig);
818 #ifdef COMPAT_FREEBSD4
819 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
820 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL ||
821 (flags & KSA_FREEBSD4) == 0)
822 SIGDELSET(ps->ps_freebsd4, sig);
824 SIGADDSET(ps->ps_freebsd4, sig);
827 if (ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN ||
828 ps->ps_sigact[_SIG_IDX(sig)] == SIG_DFL ||
829 (flags & KSA_OSIGSET) == 0)
830 SIGDELSET(ps->ps_osigset, sig);
832 SIGADDSET(ps->ps_osigset, sig);
835 mtx_unlock(&ps->ps_mtx);
840 #ifndef _SYS_SYSPROTO_H_
841 struct sigaction_args {
843 struct sigaction *act;
844 struct sigaction *oact;
848 sys_sigaction(struct thread *td, struct sigaction_args *uap)
850 struct sigaction act, oact;
851 struct sigaction *actp, *oactp;
854 actp = (uap->act != NULL) ? &act : NULL;
855 oactp = (uap->oact != NULL) ? &oact : NULL;
857 error = copyin(uap->act, actp, sizeof(act));
861 error = kern_sigaction(td, uap->sig, actp, oactp, 0);
863 error = copyout(oactp, uap->oact, sizeof(oact));
867 #ifdef COMPAT_FREEBSD4
868 #ifndef _SYS_SYSPROTO_H_
869 struct freebsd4_sigaction_args {
871 struct sigaction *act;
872 struct sigaction *oact;
876 freebsd4_sigaction(struct thread *td, struct freebsd4_sigaction_args *uap)
878 struct sigaction act, oact;
879 struct sigaction *actp, *oactp;
882 actp = (uap->act != NULL) ? &act : NULL;
883 oactp = (uap->oact != NULL) ? &oact : NULL;
885 error = copyin(uap->act, actp, sizeof(act));
889 error = kern_sigaction(td, uap->sig, actp, oactp, KSA_FREEBSD4);
891 error = copyout(oactp, uap->oact, sizeof(oact));
894 #endif /* COMAPT_FREEBSD4 */
896 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
897 #ifndef _SYS_SYSPROTO_H_
898 struct osigaction_args {
900 struct osigaction *nsa;
901 struct osigaction *osa;
905 osigaction(struct thread *td, struct osigaction_args *uap)
907 struct osigaction sa;
908 struct sigaction nsa, osa;
909 struct sigaction *nsap, *osap;
912 if (uap->signum <= 0 || uap->signum >= ONSIG)
915 nsap = (uap->nsa != NULL) ? &nsa : NULL;
916 osap = (uap->osa != NULL) ? &osa : NULL;
919 error = copyin(uap->nsa, &sa, sizeof(sa));
922 nsap->sa_handler = sa.sa_handler;
923 nsap->sa_flags = sa.sa_flags;
924 OSIG2SIG(sa.sa_mask, nsap->sa_mask);
926 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET);
927 if (osap && !error) {
928 sa.sa_handler = osap->sa_handler;
929 sa.sa_flags = osap->sa_flags;
930 SIG2OSIG(osap->sa_mask, sa.sa_mask);
931 error = copyout(&sa, uap->osa, sizeof(sa));
936 #if !defined(__i386__)
937 /* Avoid replicating the same stub everywhere */
939 osigreturn(struct thread *td, struct osigreturn_args *uap)
942 return (nosys(td, (struct nosys_args *)uap));
945 #endif /* COMPAT_43 */
948 * Initialize signal state for process 0;
949 * set to ignore signals that are ignored by default.
952 siginit(struct proc *p)
959 mtx_lock(&ps->ps_mtx);
960 for (i = 1; i <= NSIG; i++) {
961 if (sigprop(i) & SIGPROP_IGNORE && i != SIGCONT) {
962 SIGADDSET(ps->ps_sigignore, i);
965 mtx_unlock(&ps->ps_mtx);
970 * Reset specified signal to the default disposition.
973 sigdflt(struct sigacts *ps, int sig)
976 mtx_assert(&ps->ps_mtx, MA_OWNED);
977 SIGDELSET(ps->ps_sigcatch, sig);
978 if ((sigprop(sig) & SIGPROP_IGNORE) != 0 && sig != SIGCONT)
979 SIGADDSET(ps->ps_sigignore, sig);
980 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
981 SIGDELSET(ps->ps_siginfo, sig);
985 * Reset signals for an exec of the specified process.
988 execsigs(struct proc *p)
994 * Reset caught signals. Held signals remain held
995 * through td_sigmask (unless they were caught,
996 * and are now ignored by default).
998 PROC_LOCK_ASSERT(p, MA_OWNED);
1000 mtx_lock(&ps->ps_mtx);
1004 * Reset stack state to the user stack.
1005 * Clear set of signals caught on the signal stack.
1008 MPASS(td->td_proc == p);
1009 td->td_sigstk.ss_flags = SS_DISABLE;
1010 td->td_sigstk.ss_size = 0;
1011 td->td_sigstk.ss_sp = 0;
1012 td->td_pflags &= ~TDP_ALTSTACK;
1014 * Reset no zombies if child dies flag as Solaris does.
1016 ps->ps_flag &= ~(PS_NOCLDWAIT | PS_CLDSIGIGN);
1017 if (ps->ps_sigact[_SIG_IDX(SIGCHLD)] == SIG_IGN)
1018 ps->ps_sigact[_SIG_IDX(SIGCHLD)] = SIG_DFL;
1019 mtx_unlock(&ps->ps_mtx);
1023 * kern_sigprocmask()
1025 * Manipulate signal mask.
1028 kern_sigprocmask(struct thread *td, int how, sigset_t *set, sigset_t *oset,
1031 sigset_t new_block, oset1;
1036 if ((flags & SIGPROCMASK_PROC_LOCKED) != 0)
1037 PROC_LOCK_ASSERT(p, MA_OWNED);
1040 mtx_assert(&p->p_sigacts->ps_mtx, (flags & SIGPROCMASK_PS_LOCKED) != 0
1041 ? MA_OWNED : MA_NOTOWNED);
1043 *oset = td->td_sigmask;
1050 oset1 = td->td_sigmask;
1051 SIGSETOR(td->td_sigmask, *set);
1052 new_block = td->td_sigmask;
1053 SIGSETNAND(new_block, oset1);
1056 SIGSETNAND(td->td_sigmask, *set);
1061 oset1 = td->td_sigmask;
1062 if (flags & SIGPROCMASK_OLD)
1063 SIGSETLO(td->td_sigmask, *set);
1065 td->td_sigmask = *set;
1066 new_block = td->td_sigmask;
1067 SIGSETNAND(new_block, oset1);
1076 * The new_block set contains signals that were not previously
1077 * blocked, but are blocked now.
1079 * In case we block any signal that was not previously blocked
1080 * for td, and process has the signal pending, try to schedule
1081 * signal delivery to some thread that does not block the
1082 * signal, possibly waking it up.
1084 if (p->p_numthreads != 1)
1085 reschedule_signals(p, new_block, flags);
1089 if (!(flags & SIGPROCMASK_PROC_LOCKED))
1094 #ifndef _SYS_SYSPROTO_H_
1095 struct sigprocmask_args {
1097 const sigset_t *set;
1102 sys_sigprocmask(struct thread *td, struct sigprocmask_args *uap)
1105 sigset_t *setp, *osetp;
1108 setp = (uap->set != NULL) ? &set : NULL;
1109 osetp = (uap->oset != NULL) ? &oset : NULL;
1111 error = copyin(uap->set, setp, sizeof(set));
1115 error = kern_sigprocmask(td, uap->how, setp, osetp, 0);
1116 if (osetp && !error) {
1117 error = copyout(osetp, uap->oset, sizeof(oset));
1122 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1123 #ifndef _SYS_SYSPROTO_H_
1124 struct osigprocmask_args {
1130 osigprocmask(struct thread *td, struct osigprocmask_args *uap)
1135 OSIG2SIG(uap->mask, set);
1136 error = kern_sigprocmask(td, uap->how, &set, &oset, 1);
1137 SIG2OSIG(oset, td->td_retval[0]);
1140 #endif /* COMPAT_43 */
1143 sys_sigwait(struct thread *td, struct sigwait_args *uap)
1149 error = copyin(uap->set, &set, sizeof(set));
1151 td->td_retval[0] = error;
1155 error = kern_sigtimedwait(td, set, &ksi, NULL);
1158 * sigwait() function shall not return EINTR, but
1159 * the syscall does. Non-ancient libc provides the
1160 * wrapper which hides EINTR. Otherwise, EINTR return
1161 * is used by libthr to handle required cancellation
1162 * point in the sigwait().
1164 if (error == EINTR && td->td_proc->p_osrel < P_OSREL_SIGWAIT)
1166 td->td_retval[0] = error;
1170 error = copyout(&ksi.ksi_signo, uap->sig, sizeof(ksi.ksi_signo));
1171 td->td_retval[0] = error;
1176 sys_sigtimedwait(struct thread *td, struct sigtimedwait_args *uap)
1179 struct timespec *timeout;
1185 error = copyin(uap->timeout, &ts, sizeof(ts));
1193 error = copyin(uap->set, &set, sizeof(set));
1197 error = kern_sigtimedwait(td, set, &ksi, timeout);
1202 error = copyout(&ksi.ksi_info, uap->info, sizeof(siginfo_t));
1205 td->td_retval[0] = ksi.ksi_signo;
1210 sys_sigwaitinfo(struct thread *td, struct sigwaitinfo_args *uap)
1216 error = copyin(uap->set, &set, sizeof(set));
1220 error = kern_sigtimedwait(td, set, &ksi, NULL);
1225 error = copyout(&ksi.ksi_info, uap->info, sizeof(siginfo_t));
1228 td->td_retval[0] = ksi.ksi_signo;
1233 proc_td_siginfo_capture(struct thread *td, siginfo_t *si)
1237 FOREACH_THREAD_IN_PROC(td->td_proc, thr) {
1241 thr->td_si.si_signo = 0;
1246 kern_sigtimedwait(struct thread *td, sigset_t waitset, ksiginfo_t *ksi,
1247 struct timespec *timeout)
1250 sigset_t saved_mask, new_block;
1252 int error, sig, timo, timevalid = 0;
1253 struct timespec rts, ets, ts;
1263 /* Ensure the sigfastblock value is up to date. */
1264 sigfastblock_fetch(td);
1266 if (timeout != NULL) {
1267 if (timeout->tv_nsec >= 0 && timeout->tv_nsec < 1000000000) {
1269 getnanouptime(&rts);
1270 timespecadd(&rts, timeout, &ets);
1274 /* Some signals can not be waited for. */
1275 SIG_CANTMASK(waitset);
1278 saved_mask = td->td_sigmask;
1279 SIGSETNAND(td->td_sigmask, waitset);
1280 if ((p->p_sysent->sv_flags & SV_SIG_DISCIGN) != 0 ||
1281 !kern_sig_discard_ign) {
1283 td->td_flags |= TDF_SIGWAIT;
1287 mtx_lock(&ps->ps_mtx);
1289 mtx_unlock(&ps->ps_mtx);
1290 KASSERT(sig >= 0, ("sig %d", sig));
1291 if (sig != 0 && SIGISMEMBER(waitset, sig)) {
1292 if (sigqueue_get(&td->td_sigqueue, sig, ksi) != 0 ||
1293 sigqueue_get(&p->p_sigqueue, sig, ksi) != 0) {
1303 * POSIX says this must be checked after looking for pending
1306 if (timeout != NULL) {
1311 getnanouptime(&rts);
1312 if (timespeccmp(&rts, &ets, >=)) {
1316 timespecsub(&ets, &rts, &ts);
1317 TIMESPEC_TO_TIMEVAL(&tv, &ts);
1328 error = msleep(&p->p_sigacts, &p->p_mtx, PPAUSE | PCATCH,
1331 /* The syscalls can not be restarted. */
1332 if (error == ERESTART)
1335 /* We will calculate timeout by ourself. */
1336 if (timeout != NULL && error == EAGAIN)
1340 * If PTRACE_SCE or PTRACE_SCX were set after
1341 * userspace entered the syscall, return spurious
1342 * EINTR after wait was done. Only do this as last
1343 * resort after rechecking for possible queued signals
1344 * and expired timeouts.
1346 if (error == 0 && (p->p_ptevents & PTRACE_SYSCALL) != 0)
1350 td->td_flags &= ~TDF_SIGWAIT;
1353 new_block = saved_mask;
1354 SIGSETNAND(new_block, td->td_sigmask);
1355 td->td_sigmask = saved_mask;
1357 * Fewer signals can be delivered to us, reschedule signal
1360 if (p->p_numthreads != 1)
1361 reschedule_signals(p, new_block, 0);
1364 SDT_PROBE2(proc, , , signal__clear, sig, ksi);
1366 if (ksi->ksi_code == SI_TIMER)
1367 itimer_accept(p, ksi->ksi_timerid, ksi);
1370 if (KTRPOINT(td, KTR_PSIG)) {
1373 mtx_lock(&ps->ps_mtx);
1374 action = ps->ps_sigact[_SIG_IDX(sig)];
1375 mtx_unlock(&ps->ps_mtx);
1376 ktrpsig(sig, action, &td->td_sigmask, ksi->ksi_code);
1379 if (sig == SIGKILL) {
1380 proc_td_siginfo_capture(td, &ksi->ksi_info);
1388 #ifndef _SYS_SYSPROTO_H_
1389 struct sigpending_args {
1394 sys_sigpending(struct thread *td, struct sigpending_args *uap)
1396 struct proc *p = td->td_proc;
1400 pending = p->p_sigqueue.sq_signals;
1401 SIGSETOR(pending, td->td_sigqueue.sq_signals);
1403 return (copyout(&pending, uap->set, sizeof(sigset_t)));
1406 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1407 #ifndef _SYS_SYSPROTO_H_
1408 struct osigpending_args {
1413 osigpending(struct thread *td, struct osigpending_args *uap)
1415 struct proc *p = td->td_proc;
1419 pending = p->p_sigqueue.sq_signals;
1420 SIGSETOR(pending, td->td_sigqueue.sq_signals);
1422 SIG2OSIG(pending, td->td_retval[0]);
1425 #endif /* COMPAT_43 */
1427 #if defined(COMPAT_43)
1429 * Generalized interface signal handler, 4.3-compatible.
1431 #ifndef _SYS_SYSPROTO_H_
1432 struct osigvec_args {
1440 osigvec(struct thread *td, struct osigvec_args *uap)
1443 struct sigaction nsa, osa;
1444 struct sigaction *nsap, *osap;
1447 if (uap->signum <= 0 || uap->signum >= ONSIG)
1449 nsap = (uap->nsv != NULL) ? &nsa : NULL;
1450 osap = (uap->osv != NULL) ? &osa : NULL;
1452 error = copyin(uap->nsv, &vec, sizeof(vec));
1455 nsap->sa_handler = vec.sv_handler;
1456 OSIG2SIG(vec.sv_mask, nsap->sa_mask);
1457 nsap->sa_flags = vec.sv_flags;
1458 nsap->sa_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */
1460 error = kern_sigaction(td, uap->signum, nsap, osap, KSA_OSIGSET);
1461 if (osap && !error) {
1462 vec.sv_handler = osap->sa_handler;
1463 SIG2OSIG(osap->sa_mask, vec.sv_mask);
1464 vec.sv_flags = osap->sa_flags;
1465 vec.sv_flags &= ~SA_NOCLDWAIT;
1466 vec.sv_flags ^= SA_RESTART;
1467 error = copyout(&vec, uap->osv, sizeof(vec));
1472 #ifndef _SYS_SYSPROTO_H_
1473 struct osigblock_args {
1478 osigblock(struct thread *td, struct osigblock_args *uap)
1482 OSIG2SIG(uap->mask, set);
1483 kern_sigprocmask(td, SIG_BLOCK, &set, &oset, 0);
1484 SIG2OSIG(oset, td->td_retval[0]);
1488 #ifndef _SYS_SYSPROTO_H_
1489 struct osigsetmask_args {
1494 osigsetmask(struct thread *td, struct osigsetmask_args *uap)
1498 OSIG2SIG(uap->mask, set);
1499 kern_sigprocmask(td, SIG_SETMASK, &set, &oset, 0);
1500 SIG2OSIG(oset, td->td_retval[0]);
1503 #endif /* COMPAT_43 */
1506 * Suspend calling thread until signal, providing mask to be set in the
1509 #ifndef _SYS_SYSPROTO_H_
1510 struct sigsuspend_args {
1511 const sigset_t *sigmask;
1516 sys_sigsuspend(struct thread *td, struct sigsuspend_args *uap)
1521 error = copyin(uap->sigmask, &mask, sizeof(mask));
1524 return (kern_sigsuspend(td, mask));
1528 kern_sigsuspend(struct thread *td, sigset_t mask)
1530 struct proc *p = td->td_proc;
1533 /* Ensure the sigfastblock value is up to date. */
1534 sigfastblock_fetch(td);
1537 * When returning from sigsuspend, we want
1538 * the old mask to be restored after the
1539 * signal handler has finished. Thus, we
1540 * save it here and mark the sigacts structure
1544 kern_sigprocmask(td, SIG_SETMASK, &mask, &td->td_oldsigmask,
1545 SIGPROCMASK_PROC_LOCKED);
1546 td->td_pflags |= TDP_OLDMASK;
1549 * Process signals now. Otherwise, we can get spurious wakeup
1550 * due to signal entered process queue, but delivered to other
1551 * thread. But sigsuspend should return only on signal
1554 (p->p_sysent->sv_set_syscall_retval)(td, EINTR);
1555 for (has_sig = 0; !has_sig;) {
1556 while (msleep(&p->p_sigacts, &p->p_mtx, PPAUSE|PCATCH, "pause",
1559 thread_suspend_check(0);
1560 mtx_lock(&p->p_sigacts->ps_mtx);
1561 while ((sig = cursig(td)) != 0) {
1562 KASSERT(sig >= 0, ("sig %d", sig));
1563 has_sig += postsig(sig);
1565 mtx_unlock(&p->p_sigacts->ps_mtx);
1568 * If PTRACE_SCE or PTRACE_SCX were set after
1569 * userspace entered the syscall, return spurious
1572 if ((p->p_ptevents & PTRACE_SYSCALL) != 0)
1576 td->td_errno = EINTR;
1577 td->td_pflags |= TDP_NERRNO;
1578 return (EJUSTRETURN);
1581 #ifdef COMPAT_43 /* XXX - COMPAT_FBSD3 */
1583 * Compatibility sigsuspend call for old binaries. Note nonstandard calling
1584 * convention: libc stub passes mask, not pointer, to save a copyin.
1586 #ifndef _SYS_SYSPROTO_H_
1587 struct osigsuspend_args {
1593 osigsuspend(struct thread *td, struct osigsuspend_args *uap)
1597 OSIG2SIG(uap->mask, mask);
1598 return (kern_sigsuspend(td, mask));
1600 #endif /* COMPAT_43 */
1602 #if defined(COMPAT_43)
1603 #ifndef _SYS_SYSPROTO_H_
1604 struct osigstack_args {
1605 struct sigstack *nss;
1606 struct sigstack *oss;
1611 osigstack(struct thread *td, struct osigstack_args *uap)
1613 struct sigstack nss, oss;
1616 if (uap->nss != NULL) {
1617 error = copyin(uap->nss, &nss, sizeof(nss));
1621 oss.ss_sp = td->td_sigstk.ss_sp;
1622 oss.ss_onstack = sigonstack(cpu_getstack(td));
1623 if (uap->nss != NULL) {
1624 td->td_sigstk.ss_sp = nss.ss_sp;
1625 td->td_sigstk.ss_size = 0;
1626 td->td_sigstk.ss_flags |= nss.ss_onstack & SS_ONSTACK;
1627 td->td_pflags |= TDP_ALTSTACK;
1629 if (uap->oss != NULL)
1630 error = copyout(&oss, uap->oss, sizeof(oss));
1634 #endif /* COMPAT_43 */
1636 #ifndef _SYS_SYSPROTO_H_
1637 struct sigaltstack_args {
1644 sys_sigaltstack(struct thread *td, struct sigaltstack_args *uap)
1649 if (uap->ss != NULL) {
1650 error = copyin(uap->ss, &ss, sizeof(ss));
1654 error = kern_sigaltstack(td, (uap->ss != NULL) ? &ss : NULL,
1655 (uap->oss != NULL) ? &oss : NULL);
1658 if (uap->oss != NULL)
1659 error = copyout(&oss, uap->oss, sizeof(stack_t));
1664 kern_sigaltstack(struct thread *td, stack_t *ss, stack_t *oss)
1666 struct proc *p = td->td_proc;
1669 oonstack = sigonstack(cpu_getstack(td));
1672 *oss = td->td_sigstk;
1673 oss->ss_flags = (td->td_pflags & TDP_ALTSTACK)
1674 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
1680 if ((ss->ss_flags & ~SS_DISABLE) != 0)
1682 if (!(ss->ss_flags & SS_DISABLE)) {
1683 if (ss->ss_size < p->p_sysent->sv_minsigstksz)
1686 td->td_sigstk = *ss;
1687 td->td_pflags |= TDP_ALTSTACK;
1689 td->td_pflags &= ~TDP_ALTSTACK;
1695 struct killpg1_ctx {
1705 killpg1_sendsig(struct proc *p, bool notself, struct killpg1_ctx *arg)
1709 if (p->p_pid <= 1 || (p->p_flag & P_SYSTEM) != 0 ||
1710 (notself && p == arg->td->td_proc) || p->p_state == PRS_NEW)
1713 err = p_cansignal(arg->td, p, arg->sig);
1714 if (err == 0 && arg->sig != 0)
1715 pksignal(p, arg->sig, arg->ksi);
1721 else if (arg->ret == 0 && err != ESRCH && err != EPERM)
1726 * Common code for kill process group/broadcast kill.
1727 * cp is calling process.
1730 killpg1(struct thread *td, int sig, int pgid, int all, ksiginfo_t *ksi)
1734 struct killpg1_ctx arg;
1746 sx_slock(&allproc_lock);
1747 FOREACH_PROC_IN_SYSTEM(p) {
1748 killpg1_sendsig(p, true, &arg);
1750 sx_sunlock(&allproc_lock);
1752 sx_slock(&proctree_lock);
1755 * zero pgid means send to my process group.
1757 pgrp = td->td_proc->p_pgrp;
1760 pgrp = pgfind(pgid);
1762 sx_sunlock(&proctree_lock);
1766 sx_sunlock(&proctree_lock);
1767 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
1768 killpg1_sendsig(p, false, &arg);
1772 MPASS(arg.ret != 0 || arg.found || !arg.sent);
1773 if (arg.ret == 0 && !arg.sent)
1774 arg.ret = arg.found ? EPERM : ESRCH;
1778 #ifndef _SYS_SYSPROTO_H_
1786 sys_kill(struct thread *td, struct kill_args *uap)
1789 return (kern_kill(td, uap->pid, uap->signum));
1793 kern_kill(struct thread *td, pid_t pid, int signum)
1800 * A process in capability mode can send signals only to himself.
1801 * The main rationale behind this is that abort(3) is implemented as
1802 * kill(getpid(), SIGABRT).
1804 if (IN_CAPABILITY_MODE(td) && pid != td->td_proc->p_pid)
1807 AUDIT_ARG_SIGNUM(signum);
1809 if ((u_int)signum > _SIG_MAXSIG)
1812 ksiginfo_init(&ksi);
1813 ksi.ksi_signo = signum;
1814 ksi.ksi_code = SI_USER;
1815 ksi.ksi_pid = td->td_proc->p_pid;
1816 ksi.ksi_uid = td->td_ucred->cr_ruid;
1819 /* kill single process */
1820 if ((p = pfind_any(pid)) == NULL)
1822 AUDIT_ARG_PROCESS(p);
1823 error = p_cansignal(td, p, signum);
1824 if (error == 0 && signum)
1825 pksignal(p, signum, &ksi);
1830 case -1: /* broadcast signal */
1831 return (killpg1(td, signum, 0, 1, &ksi));
1832 case 0: /* signal own process group */
1833 return (killpg1(td, signum, 0, 0, &ksi));
1834 default: /* negative explicit process group */
1835 return (killpg1(td, signum, -pid, 0, &ksi));
1841 sys_pdkill(struct thread *td, struct pdkill_args *uap)
1846 AUDIT_ARG_SIGNUM(uap->signum);
1847 AUDIT_ARG_FD(uap->fd);
1848 if ((u_int)uap->signum > _SIG_MAXSIG)
1851 error = procdesc_find(td, uap->fd, &cap_pdkill_rights, &p);
1854 AUDIT_ARG_PROCESS(p);
1855 error = p_cansignal(td, p, uap->signum);
1856 if (error == 0 && uap->signum)
1857 kern_psignal(p, uap->signum);
1862 #if defined(COMPAT_43)
1863 #ifndef _SYS_SYSPROTO_H_
1864 struct okillpg_args {
1871 okillpg(struct thread *td, struct okillpg_args *uap)
1875 AUDIT_ARG_SIGNUM(uap->signum);
1876 AUDIT_ARG_PID(uap->pgid);
1877 if ((u_int)uap->signum > _SIG_MAXSIG)
1880 ksiginfo_init(&ksi);
1881 ksi.ksi_signo = uap->signum;
1882 ksi.ksi_code = SI_USER;
1883 ksi.ksi_pid = td->td_proc->p_pid;
1884 ksi.ksi_uid = td->td_ucred->cr_ruid;
1885 return (killpg1(td, uap->signum, uap->pgid, 0, &ksi));
1887 #endif /* COMPAT_43 */
1889 #ifndef _SYS_SYSPROTO_H_
1890 struct sigqueue_args {
1893 /* union sigval */ void *value;
1897 sys_sigqueue(struct thread *td, struct sigqueue_args *uap)
1901 sv.sival_ptr = uap->value;
1903 return (kern_sigqueue(td, uap->pid, uap->signum, &sv));
1907 kern_sigqueue(struct thread *td, pid_t pid, int signum, union sigval *value)
1913 if ((u_int)signum > _SIG_MAXSIG)
1917 * Specification says sigqueue can only send signal to
1923 if ((p = pfind_any(pid)) == NULL)
1925 error = p_cansignal(td, p, signum);
1926 if (error == 0 && signum != 0) {
1927 ksiginfo_init(&ksi);
1928 ksi.ksi_flags = KSI_SIGQ;
1929 ksi.ksi_signo = signum;
1930 ksi.ksi_code = SI_QUEUE;
1931 ksi.ksi_pid = td->td_proc->p_pid;
1932 ksi.ksi_uid = td->td_ucred->cr_ruid;
1933 ksi.ksi_value = *value;
1934 error = pksignal(p, ksi.ksi_signo, &ksi);
1941 * Send a signal to a process group.
1944 gsignal(int pgid, int sig, ksiginfo_t *ksi)
1949 sx_slock(&proctree_lock);
1950 pgrp = pgfind(pgid);
1951 sx_sunlock(&proctree_lock);
1953 pgsignal(pgrp, sig, 0, ksi);
1960 * Send a signal to a process group. If checktty is 1,
1961 * limit to members which have a controlling terminal.
1964 pgsignal(struct pgrp *pgrp, int sig, int checkctty, ksiginfo_t *ksi)
1969 PGRP_LOCK_ASSERT(pgrp, MA_OWNED);
1970 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) {
1972 if (p->p_state == PRS_NORMAL &&
1973 (checkctty == 0 || p->p_flag & P_CONTROLT))
1974 pksignal(p, sig, ksi);
1981 * Recalculate the signal mask and reset the signal disposition after
1982 * usermode frame for delivery is formed. Should be called after
1983 * mach-specific routine, because sysent->sv_sendsig() needs correct
1984 * ps_siginfo and signal mask.
1987 postsig_done(int sig, struct thread *td, struct sigacts *ps)
1991 mtx_assert(&ps->ps_mtx, MA_OWNED);
1992 td->td_ru.ru_nsignals++;
1993 mask = ps->ps_catchmask[_SIG_IDX(sig)];
1994 if (!SIGISMEMBER(ps->ps_signodefer, sig))
1995 SIGADDSET(mask, sig);
1996 kern_sigprocmask(td, SIG_BLOCK, &mask, NULL,
1997 SIGPROCMASK_PROC_LOCKED | SIGPROCMASK_PS_LOCKED);
1998 if (SIGISMEMBER(ps->ps_sigreset, sig))
2003 * Send a signal caused by a trap to the current thread. If it will be
2004 * caught immediately, deliver it with correct code. Otherwise, post it
2008 trapsignal(struct thread *td, ksiginfo_t *ksi)
2016 sig = ksi->ksi_signo;
2017 code = ksi->ksi_code;
2018 KASSERT(_SIG_VALID(sig), ("invalid signal"));
2020 sigfastblock_fetch(td);
2023 mtx_lock(&ps->ps_mtx);
2024 sigmask = td->td_sigmask;
2025 if (td->td_sigblock_val != 0)
2026 SIGSETOR(sigmask, fastblock_mask);
2027 if ((p->p_flag & P_TRACED) == 0 && SIGISMEMBER(ps->ps_sigcatch, sig) &&
2028 !SIGISMEMBER(sigmask, sig)) {
2030 if (KTRPOINT(curthread, KTR_PSIG))
2031 ktrpsig(sig, ps->ps_sigact[_SIG_IDX(sig)],
2032 &td->td_sigmask, code);
2034 (*p->p_sysent->sv_sendsig)(ps->ps_sigact[_SIG_IDX(sig)],
2035 ksi, &td->td_sigmask);
2036 postsig_done(sig, td, ps);
2037 mtx_unlock(&ps->ps_mtx);
2040 * Avoid a possible infinite loop if the thread
2041 * masking the signal or process is ignoring the
2044 if (kern_forcesigexit && (SIGISMEMBER(sigmask, sig) ||
2045 ps->ps_sigact[_SIG_IDX(sig)] == SIG_IGN)) {
2046 SIGDELSET(td->td_sigmask, sig);
2047 SIGDELSET(ps->ps_sigcatch, sig);
2048 SIGDELSET(ps->ps_sigignore, sig);
2049 ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
2050 td->td_pflags &= ~TDP_SIGFASTBLOCK;
2051 td->td_sigblock_val = 0;
2053 mtx_unlock(&ps->ps_mtx);
2054 p->p_sig = sig; /* XXX to verify code */
2055 tdsendsignal(p, td, sig, ksi);
2060 static struct thread *
2061 sigtd(struct proc *p, int sig, bool fast_sigblock)
2063 struct thread *td, *signal_td;
2065 PROC_LOCK_ASSERT(p, MA_OWNED);
2066 MPASS(!fast_sigblock || p == curproc);
2069 * Check if current thread can handle the signal without
2070 * switching context to another thread.
2072 if (curproc == p && !SIGISMEMBER(curthread->td_sigmask, sig) &&
2073 (!fast_sigblock || curthread->td_sigblock_val == 0))
2076 FOREACH_THREAD_IN_PROC(p, td) {
2077 if (!SIGISMEMBER(td->td_sigmask, sig) && (!fast_sigblock ||
2078 td != curthread || td->td_sigblock_val == 0)) {
2083 if (signal_td == NULL)
2084 signal_td = FIRST_THREAD_IN_PROC(p);
2089 * Send the signal to the process. If the signal has an action, the action
2090 * is usually performed by the target process rather than the caller; we add
2091 * the signal to the set of pending signals for the process.
2094 * o When a stop signal is sent to a sleeping process that takes the
2095 * default action, the process is stopped without awakening it.
2096 * o SIGCONT restarts stopped processes (or puts them back to sleep)
2097 * regardless of the signal action (eg, blocked or ignored).
2099 * Other ignored signals are discarded immediately.
2101 * NB: This function may be entered from the debugger via the "kill" DDB
2102 * command. There is little that can be done to mitigate the possibly messy
2103 * side effects of this unwise possibility.
2106 kern_psignal(struct proc *p, int sig)
2110 ksiginfo_init(&ksi);
2111 ksi.ksi_signo = sig;
2112 ksi.ksi_code = SI_KERNEL;
2113 (void) tdsendsignal(p, NULL, sig, &ksi);
2117 pksignal(struct proc *p, int sig, ksiginfo_t *ksi)
2120 return (tdsendsignal(p, NULL, sig, ksi));
2123 /* Utility function for finding a thread to send signal event to. */
2125 sigev_findtd(struct proc *p ,struct sigevent *sigev, struct thread **ttd)
2129 if (sigev->sigev_notify == SIGEV_THREAD_ID) {
2130 td = tdfind(sigev->sigev_notify_thread_id, p->p_pid);
2142 tdsignal(struct thread *td, int sig)
2146 ksiginfo_init(&ksi);
2147 ksi.ksi_signo = sig;
2148 ksi.ksi_code = SI_KERNEL;
2149 (void) tdsendsignal(td->td_proc, td, sig, &ksi);
2153 tdksignal(struct thread *td, int sig, ksiginfo_t *ksi)
2156 (void) tdsendsignal(td->td_proc, td, sig, ksi);
2160 sig_sleepq_abort(struct thread *td, int intrval)
2162 THREAD_LOCK_ASSERT(td, MA_OWNED);
2164 if (intrval == 0 && (td->td_flags & TDF_SIGWAIT) == 0) {
2168 return (sleepq_abort(td, intrval));
2172 tdsendsignal(struct proc *p, struct thread *td, int sig, ksiginfo_t *ksi)
2175 sigqueue_t *sigqueue;
2182 MPASS(td == NULL || p == td->td_proc);
2183 PROC_LOCK_ASSERT(p, MA_OWNED);
2185 if (!_SIG_VALID(sig))
2186 panic("%s(): invalid signal %d", __func__, sig);
2188 KASSERT(ksi == NULL || !KSI_ONQ(ksi), ("%s: ksi on queue", __func__));
2191 * IEEE Std 1003.1-2001: return success when killing a zombie.
2193 if (p->p_state == PRS_ZOMBIE) {
2194 if (ksi && (ksi->ksi_flags & KSI_INS))
2195 ksiginfo_tryfree(ksi);
2200 KNOTE_LOCKED(p->p_klist, NOTE_SIGNAL | sig);
2201 prop = sigprop(sig);
2204 td = sigtd(p, sig, false);
2205 sigqueue = &p->p_sigqueue;
2207 sigqueue = &td->td_sigqueue;
2209 SDT_PROBE3(proc, , , signal__send, td, p, sig);
2212 * If the signal is being ignored, then we forget about it
2213 * immediately, except when the target process executes
2214 * sigwait(). (Note: we don't set SIGCONT in ps_sigignore,
2215 * and if it is set to SIG_IGN, action will be SIG_DFL here.)
2217 mtx_lock(&ps->ps_mtx);
2218 if (SIGISMEMBER(ps->ps_sigignore, sig)) {
2219 if (kern_sig_discard_ign &&
2220 (p->p_sysent->sv_flags & SV_SIG_DISCIGN) == 0) {
2221 SDT_PROBE3(proc, , , signal__discard, td, p, sig);
2223 mtx_unlock(&ps->ps_mtx);
2224 if (ksi && (ksi->ksi_flags & KSI_INS))
2225 ksiginfo_tryfree(ksi);
2232 if (SIGISMEMBER(td->td_sigmask, sig))
2234 else if (SIGISMEMBER(ps->ps_sigcatch, sig))
2238 if (SIGISMEMBER(ps->ps_sigintr, sig))
2243 mtx_unlock(&ps->ps_mtx);
2245 if (prop & SIGPROP_CONT)
2246 sigqueue_delete_stopmask_proc(p);
2247 else if (prop & SIGPROP_STOP) {
2249 * If sending a tty stop signal to a member of an orphaned
2250 * process group, discard the signal here if the action
2251 * is default; don't stop the process below if sleeping,
2252 * and don't clear any pending SIGCONT.
2254 if ((prop & SIGPROP_TTYSTOP) != 0 &&
2255 (p->p_pgrp->pg_flags & PGRP_ORPHANED) != 0 &&
2256 action == SIG_DFL) {
2257 if (ksi && (ksi->ksi_flags & KSI_INS))
2258 ksiginfo_tryfree(ksi);
2261 sigqueue_delete_proc(p, SIGCONT);
2262 if (p->p_flag & P_CONTINUED) {
2263 p->p_flag &= ~P_CONTINUED;
2264 PROC_LOCK(p->p_pptr);
2265 sigqueue_take(p->p_ksi);
2266 PROC_UNLOCK(p->p_pptr);
2270 ret = sigqueue_add(sigqueue, sig, ksi);
2275 * Defer further processing for signals which are held,
2276 * except that stopped processes must be continued by SIGCONT.
2278 if (action == SIG_HOLD &&
2279 !((prop & SIGPROP_CONT) && (p->p_flag & P_STOPPED_SIG)))
2285 * Some signals have a process-wide effect and a per-thread
2286 * component. Most processing occurs when the process next
2287 * tries to cross the user boundary, however there are some
2288 * times when processing needs to be done immediately, such as
2289 * waking up threads so that they can cross the user boundary.
2290 * We try to do the per-process part here.
2292 if (P_SHOULDSTOP(p)) {
2293 KASSERT(!(p->p_flag & P_WEXIT),
2294 ("signal to stopped but exiting process"));
2295 if (sig == SIGKILL) {
2297 * If traced process is already stopped,
2298 * then no further action is necessary.
2300 if (p->p_flag & P_TRACED)
2303 * SIGKILL sets process running.
2304 * It will die elsewhere.
2305 * All threads must be restarted.
2307 p->p_flag &= ~P_STOPPED_SIG;
2311 if (prop & SIGPROP_CONT) {
2313 * If traced process is already stopped,
2314 * then no further action is necessary.
2316 if (p->p_flag & P_TRACED)
2319 * If SIGCONT is default (or ignored), we continue the
2320 * process but don't leave the signal in sigqueue as
2321 * it has no further action. If SIGCONT is held, we
2322 * continue the process and leave the signal in
2323 * sigqueue. If the process catches SIGCONT, let it
2324 * handle the signal itself. If it isn't waiting on
2325 * an event, it goes back to run state.
2326 * Otherwise, process goes back to sleep state.
2328 p->p_flag &= ~P_STOPPED_SIG;
2330 if (p->p_numthreads == p->p_suspcount) {
2332 p->p_flag |= P_CONTINUED;
2333 p->p_xsig = SIGCONT;
2334 PROC_LOCK(p->p_pptr);
2335 childproc_continued(p);
2336 PROC_UNLOCK(p->p_pptr);
2339 if (action == SIG_DFL) {
2340 thread_unsuspend(p);
2342 sigqueue_delete(sigqueue, sig);
2345 if (action == SIG_CATCH) {
2347 * The process wants to catch it so it needs
2348 * to run at least one thread, but which one?
2354 * The signal is not ignored or caught.
2356 thread_unsuspend(p);
2361 if (prop & SIGPROP_STOP) {
2363 * If traced process is already stopped,
2364 * then no further action is necessary.
2366 if (p->p_flag & P_TRACED)
2369 * Already stopped, don't need to stop again
2370 * (If we did the shell could get confused).
2371 * Just make sure the signal STOP bit set.
2373 p->p_flag |= P_STOPPED_SIG;
2374 sigqueue_delete(sigqueue, sig);
2379 * All other kinds of signals:
2380 * If a thread is sleeping interruptibly, simulate a
2381 * wakeup so that when it is continued it will be made
2382 * runnable and can look at the signal. However, don't make
2383 * the PROCESS runnable, leave it stopped.
2384 * It may run a bit until it hits a thread_suspend_check().
2388 if (TD_CAN_ABORT(td))
2389 wakeup_swapper = sig_sleepq_abort(td, intrval);
2395 * Mutexes are short lived. Threads waiting on them will
2396 * hit thread_suspend_check() soon.
2398 } else if (p->p_state == PRS_NORMAL) {
2399 if (p->p_flag & P_TRACED || action == SIG_CATCH) {
2400 tdsigwakeup(td, sig, action, intrval);
2404 MPASS(action == SIG_DFL);
2406 if (prop & SIGPROP_STOP) {
2407 if (p->p_flag & (P_PPWAIT|P_WEXIT))
2409 p->p_flag |= P_STOPPED_SIG;
2412 wakeup_swapper = sig_suspend_threads(td, p, 1);
2413 if (p->p_numthreads == p->p_suspcount) {
2415 * only thread sending signal to another
2416 * process can reach here, if thread is sending
2417 * signal to its process, because thread does
2418 * not suspend itself here, p_numthreads
2419 * should never be equal to p_suspcount.
2423 sigqueue_delete_proc(p, p->p_xsig);
2429 /* Not in "NORMAL" state. discard the signal. */
2430 sigqueue_delete(sigqueue, sig);
2435 * The process is not stopped so we need to apply the signal to all the
2439 tdsigwakeup(td, sig, action, intrval);
2441 thread_unsuspend(p);
2444 itimer_proc_continue(p);
2445 kqtimer_proc_continue(p);
2447 /* If we jump here, proc slock should not be owned. */
2448 PROC_SLOCK_ASSERT(p, MA_NOTOWNED);
2456 * The force of a signal has been directed against a single
2457 * thread. We need to see what we can do about knocking it
2458 * out of any sleep it may be in etc.
2461 tdsigwakeup(struct thread *td, int sig, sig_t action, int intrval)
2463 struct proc *p = td->td_proc;
2464 int prop, wakeup_swapper;
2466 PROC_LOCK_ASSERT(p, MA_OWNED);
2467 prop = sigprop(sig);
2472 * Bring the priority of a thread up if we want it to get
2473 * killed in this lifetime. Be careful to avoid bumping the
2474 * priority of the idle thread, since we still allow to signal
2477 if (action == SIG_DFL && (prop & SIGPROP_KILL) != 0 &&
2478 td->td_priority > PUSER && !TD_IS_IDLETHREAD(td))
2479 sched_prio(td, PUSER);
2480 if (TD_ON_SLEEPQ(td)) {
2482 * If thread is sleeping uninterruptibly
2483 * we can't interrupt the sleep... the signal will
2484 * be noticed when the process returns through
2485 * trap() or syscall().
2487 if ((td->td_flags & TDF_SINTR) == 0)
2490 * If SIGCONT is default (or ignored) and process is
2491 * asleep, we are finished; the process should not
2494 if ((prop & SIGPROP_CONT) && action == SIG_DFL) {
2497 sigqueue_delete(&p->p_sigqueue, sig);
2499 * It may be on either list in this state.
2500 * Remove from both for now.
2502 sigqueue_delete(&td->td_sigqueue, sig);
2507 * Don't awaken a sleeping thread for SIGSTOP if the
2508 * STOP signal is deferred.
2510 if ((prop & SIGPROP_STOP) != 0 && (td->td_flags & (TDF_SBDRY |
2511 TDF_SERESTART | TDF_SEINTR)) == TDF_SBDRY)
2515 * Give low priority threads a better chance to run.
2517 if (td->td_priority > PUSER && !TD_IS_IDLETHREAD(td))
2518 sched_prio(td, PUSER);
2520 wakeup_swapper = sig_sleepq_abort(td, intrval);
2528 * Other states do nothing with the signal immediately,
2529 * other than kicking ourselves if we are running.
2530 * It will either never be noticed, or noticed very soon.
2533 if (TD_IS_RUNNING(td) && td != curthread)
2543 ptrace_coredump(struct thread *td)
2546 struct thr_coredump_req *tcq;
2549 MPASS(td == curthread);
2551 PROC_LOCK_ASSERT(p, MA_OWNED);
2552 if ((td->td_dbgflags & TDB_COREDUMPRQ) == 0)
2554 KASSERT((p->p_flag & P_STOPPED_TRACE) != 0, ("not stopped"));
2556 tcq = td->td_coredump;
2557 KASSERT(tcq != NULL, ("td_coredump is NULL"));
2559 if (p->p_sysent->sv_coredump == NULL) {
2560 tcq->tc_error = ENOSYS;
2565 rl_cookie = vn_rangelock_wlock(tcq->tc_vp, 0, OFF_MAX);
2567 tcq->tc_error = p->p_sysent->sv_coredump(td, tcq->tc_vp,
2568 tcq->tc_limit, tcq->tc_flags);
2570 vn_rangelock_unlock(tcq->tc_vp, rl_cookie);
2573 td->td_dbgflags &= ~TDB_COREDUMPRQ;
2574 td->td_coredump = NULL;
2579 sig_suspend_threads(struct thread *td, struct proc *p, int sending)
2584 PROC_LOCK_ASSERT(p, MA_OWNED);
2585 PROC_SLOCK_ASSERT(p, MA_OWNED);
2586 MPASS(sending || td == curthread);
2589 FOREACH_THREAD_IN_PROC(p, td2) {
2591 td2->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
2592 if ((TD_IS_SLEEPING(td2) || TD_IS_SWAPPED(td2)) &&
2593 (td2->td_flags & TDF_SINTR)) {
2594 if (td2->td_flags & TDF_SBDRY) {
2596 * Once a thread is asleep with
2597 * TDF_SBDRY and without TDF_SERESTART
2598 * or TDF_SEINTR set, it should never
2599 * become suspended due to this check.
2601 KASSERT(!TD_IS_SUSPENDED(td2),
2602 ("thread with deferred stops suspended"));
2603 if (TD_SBDRY_INTR(td2)) {
2604 wakeup_swapper |= sleepq_abort(td2,
2605 TD_SBDRY_ERRNO(td2));
2608 } else if (!TD_IS_SUSPENDED(td2))
2609 thread_suspend_one(td2);
2610 } else if (!TD_IS_SUSPENDED(td2)) {
2611 if (sending || td != td2)
2612 td2->td_flags |= TDF_ASTPENDING;
2614 if (TD_IS_RUNNING(td2) && td2 != td)
2615 forward_signal(td2);
2620 return (wakeup_swapper);
2624 * Stop the process for an event deemed interesting to the debugger. If si is
2625 * non-NULL, this is a signal exchange; the new signal requested by the
2626 * debugger will be returned for handling. If si is NULL, this is some other
2627 * type of interesting event. The debugger may request a signal be delivered in
2628 * that case as well, however it will be deferred until it can be handled.
2631 ptracestop(struct thread *td, int sig, ksiginfo_t *si)
2633 struct proc *p = td->td_proc;
2637 PROC_LOCK_ASSERT(p, MA_OWNED);
2638 KASSERT(!(p->p_flag & P_WEXIT), ("Stopping exiting process"));
2639 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK,
2640 &p->p_mtx.lock_object, "Stopping for traced signal");
2644 if (si == NULL || (si->ksi_flags & KSI_PTRACE) == 0) {
2645 td->td_dbgflags |= TDB_XSIG;
2646 CTR4(KTR_PTRACE, "ptracestop: tid %d (pid %d) flags %#x sig %d",
2647 td->td_tid, p->p_pid, td->td_dbgflags, sig);
2649 while ((p->p_flag & P_TRACED) && (td->td_dbgflags & TDB_XSIG)) {
2652 * Ensure that, if we've been PT_KILLed, the
2653 * exit status reflects that. Another thread
2654 * may also be in ptracestop(), having just
2655 * received the SIGKILL, but this thread was
2656 * unsuspended first.
2658 td->td_dbgflags &= ~TDB_XSIG;
2659 td->td_xsig = SIGKILL;
2663 if (p->p_flag & P_SINGLE_EXIT &&
2664 !(td->td_dbgflags & TDB_EXIT)) {
2666 * Ignore ptrace stops except for thread exit
2667 * events when the process exits.
2669 td->td_dbgflags &= ~TDB_XSIG;
2675 * Make wait(2) work. Ensure that right after the
2676 * attach, the thread which was decided to become the
2677 * leader of attach gets reported to the waiter.
2678 * Otherwise, just avoid overwriting another thread's
2679 * assignment to p_xthread. If another thread has
2680 * already set p_xthread, the current thread will get
2681 * a chance to report itself upon the next iteration.
2683 if ((td->td_dbgflags & TDB_FSTP) != 0 ||
2684 ((p->p_flag2 & P2_PTRACE_FSTP) == 0 &&
2685 p->p_xthread == NULL)) {
2690 * If we are on sleepqueue already,
2691 * let sleepqueue code decide if it
2692 * needs to go sleep after attach.
2694 if (td->td_wchan == NULL)
2695 td->td_dbgflags &= ~TDB_FSTP;
2697 p->p_flag2 &= ~P2_PTRACE_FSTP;
2698 p->p_flag |= P_STOPPED_SIG | P_STOPPED_TRACE;
2699 sig_suspend_threads(td, p, 0);
2701 if ((td->td_dbgflags & TDB_STOPATFORK) != 0) {
2702 td->td_dbgflags &= ~TDB_STOPATFORK;
2705 td->td_dbgflags |= TDB_SSWITCH;
2706 thread_suspend_switch(td, p);
2707 td->td_dbgflags &= ~TDB_SSWITCH;
2708 if ((td->td_dbgflags & TDB_COREDUMPRQ) != 0) {
2710 ptrace_coredump(td);
2714 if (p->p_xthread == td)
2715 p->p_xthread = NULL;
2716 if (!(p->p_flag & P_TRACED))
2718 if (td->td_dbgflags & TDB_SUSPEND) {
2719 if (p->p_flag & P_SINGLE_EXIT)
2727 if (si != NULL && sig == td->td_xsig) {
2728 /* Parent wants us to take the original signal unchanged. */
2729 si->ksi_flags |= KSI_HEAD;
2730 if (sigqueue_add(&td->td_sigqueue, sig, si) != 0)
2732 } else if (td->td_xsig != 0) {
2734 * If parent wants us to take a new signal, then it will leave
2735 * it in td->td_xsig; otherwise we just look for signals again.
2737 ksiginfo_init(&ksi);
2738 ksi.ksi_signo = td->td_xsig;
2739 ksi.ksi_flags |= KSI_PTRACE;
2740 td2 = sigtd(p, td->td_xsig, false);
2741 tdsendsignal(p, td2, td->td_xsig, &ksi);
2746 return (td->td_xsig);
2750 reschedule_signals(struct proc *p, sigset_t block, int flags)
2755 bool fastblk, pslocked;
2757 PROC_LOCK_ASSERT(p, MA_OWNED);
2759 pslocked = (flags & SIGPROCMASK_PS_LOCKED) != 0;
2760 mtx_assert(&ps->ps_mtx, pslocked ? MA_OWNED : MA_NOTOWNED);
2761 if (SIGISEMPTY(p->p_siglist))
2763 SIGSETAND(block, p->p_siglist);
2764 fastblk = (flags & SIGPROCMASK_FASTBLK) != 0;
2765 while ((sig = sig_ffs(&block)) != 0) {
2766 SIGDELSET(block, sig);
2767 td = sigtd(p, sig, fastblk);
2770 * If sigtd() selected us despite sigfastblock is
2771 * blocking, do not activate AST or wake us, to avoid
2772 * loop in AST handler.
2774 if (fastblk && td == curthread)
2779 mtx_lock(&ps->ps_mtx);
2780 if (p->p_flag & P_TRACED ||
2781 (SIGISMEMBER(ps->ps_sigcatch, sig) &&
2782 !SIGISMEMBER(td->td_sigmask, sig))) {
2783 tdsigwakeup(td, sig, SIG_CATCH,
2784 (SIGISMEMBER(ps->ps_sigintr, sig) ? EINTR :
2788 mtx_unlock(&ps->ps_mtx);
2793 tdsigcleanup(struct thread *td)
2799 PROC_LOCK_ASSERT(p, MA_OWNED);
2801 sigqueue_flush(&td->td_sigqueue);
2802 if (p->p_numthreads == 1)
2806 * Since we cannot handle signals, notify signal post code
2807 * about this by filling the sigmask.
2809 * Also, if needed, wake up thread(s) that do not block the
2810 * same signals as the exiting thread, since the thread might
2811 * have been selected for delivery and woken up.
2813 SIGFILLSET(unblocked);
2814 SIGSETNAND(unblocked, td->td_sigmask);
2815 SIGFILLSET(td->td_sigmask);
2816 reschedule_signals(p, unblocked, 0);
2821 sigdeferstop_curr_flags(int cflags)
2824 MPASS((cflags & (TDF_SEINTR | TDF_SERESTART)) == 0 ||
2825 (cflags & TDF_SBDRY) != 0);
2826 return (cflags & (TDF_SBDRY | TDF_SEINTR | TDF_SERESTART));
2830 * Defer the delivery of SIGSTOP for the current thread, according to
2831 * the requested mode. Returns previous flags, which must be restored
2832 * by sigallowstop().
2834 * TDF_SBDRY, TDF_SEINTR, and TDF_SERESTART flags are only set and
2835 * cleared by the current thread, which allow the lock-less read-only
2839 sigdeferstop_impl(int mode)
2845 cflags = sigdeferstop_curr_flags(td->td_flags);
2847 case SIGDEFERSTOP_NOP:
2850 case SIGDEFERSTOP_OFF:
2853 case SIGDEFERSTOP_SILENT:
2854 nflags = (cflags | TDF_SBDRY) & ~(TDF_SEINTR | TDF_SERESTART);
2856 case SIGDEFERSTOP_EINTR:
2857 nflags = (cflags | TDF_SBDRY | TDF_SEINTR) & ~TDF_SERESTART;
2859 case SIGDEFERSTOP_ERESTART:
2860 nflags = (cflags | TDF_SBDRY | TDF_SERESTART) & ~TDF_SEINTR;
2863 panic("sigdeferstop: invalid mode %x", mode);
2866 if (cflags == nflags)
2867 return (SIGDEFERSTOP_VAL_NCHG);
2869 td->td_flags = (td->td_flags & ~cflags) | nflags;
2875 * Restores the STOP handling mode, typically permitting the delivery
2876 * of SIGSTOP for the current thread. This does not immediately
2877 * suspend if a stop was posted. Instead, the thread will suspend
2878 * either via ast() or a subsequent interruptible sleep.
2881 sigallowstop_impl(int prev)
2886 KASSERT(prev != SIGDEFERSTOP_VAL_NCHG, ("failed sigallowstop"));
2887 KASSERT((prev & ~(TDF_SBDRY | TDF_SEINTR | TDF_SERESTART)) == 0,
2888 ("sigallowstop: incorrect previous mode %x", prev));
2890 cflags = sigdeferstop_curr_flags(td->td_flags);
2891 if (cflags != prev) {
2893 td->td_flags = (td->td_flags & ~cflags) | prev;
2899 * If the current process has received a signal (should be caught or cause
2900 * termination, should interrupt current syscall), return the signal number.
2901 * Stop signals with default action are processed immediately, then cleared;
2902 * they aren't returned. This is checked after each entry to the system for
2903 * a syscall or trap (though this can usually be done without calling issignal
2904 * by checking the pending signal masks in cursig.) The normal call
2907 * while (sig = cursig(curthread))
2911 issignal(struct thread *td)
2915 struct sigqueue *queue;
2916 sigset_t sigpending;
2922 mtx_assert(&ps->ps_mtx, MA_OWNED);
2923 PROC_LOCK_ASSERT(p, MA_OWNED);
2925 sigpending = td->td_sigqueue.sq_signals;
2926 SIGSETOR(sigpending, p->p_sigqueue.sq_signals);
2927 SIGSETNAND(sigpending, td->td_sigmask);
2929 if ((p->p_flag & P_PPWAIT) != 0 || (td->td_flags &
2930 (TDF_SBDRY | TDF_SERESTART | TDF_SEINTR)) == TDF_SBDRY)
2931 SIG_STOPSIGMASK(sigpending);
2932 if (SIGISEMPTY(sigpending)) /* no signal to send */
2936 * Do fast sigblock if requested by usermode. Since
2937 * we do know that there was a signal pending at this
2938 * point, set the FAST_SIGBLOCK_PEND as indicator for
2939 * usermode to perform a dummy call to
2940 * FAST_SIGBLOCK_UNBLOCK, which causes immediate
2941 * delivery of postponed pending signal.
2943 if ((td->td_pflags & TDP_SIGFASTBLOCK) != 0) {
2944 if (td->td_sigblock_val != 0)
2945 SIGSETNAND(sigpending, fastblock_mask);
2946 if (SIGISEMPTY(sigpending)) {
2947 td->td_pflags |= TDP_SIGFASTPENDING;
2952 if ((p->p_flag & (P_TRACED | P_PPTRACE)) == P_TRACED &&
2953 (p->p_flag2 & P2_PTRACE_FSTP) != 0 &&
2954 SIGISMEMBER(sigpending, SIGSTOP)) {
2956 * If debugger just attached, always consume
2957 * SIGSTOP from ptrace(PT_ATTACH) first, to
2958 * execute the debugger attach ritual in
2962 td->td_dbgflags |= TDB_FSTP;
2964 sig = sig_ffs(&sigpending);
2968 * We should allow pending but ignored signals below
2969 * only if there is sigwait() active, or P_TRACED was
2970 * on when they were posted.
2972 if (SIGISMEMBER(ps->ps_sigignore, sig) &&
2973 (p->p_flag & P_TRACED) == 0 &&
2974 (td->td_flags & TDF_SIGWAIT) == 0) {
2975 sigqueue_delete(&td->td_sigqueue, sig);
2976 sigqueue_delete(&p->p_sigqueue, sig);
2979 if ((p->p_flag & (P_TRACED | P_PPTRACE)) == P_TRACED) {
2981 * If traced, always stop.
2982 * Remove old signal from queue before the stop.
2983 * XXX shrug off debugger, it causes siginfo to
2986 queue = &td->td_sigqueue;
2987 ksiginfo_init(&ksi);
2988 if (sigqueue_get(queue, sig, &ksi) == 0) {
2989 queue = &p->p_sigqueue;
2990 sigqueue_get(queue, sig, &ksi);
2992 td->td_si = ksi.ksi_info;
2994 mtx_unlock(&ps->ps_mtx);
2995 sig = ptracestop(td, sig, &ksi);
2996 mtx_lock(&ps->ps_mtx);
2998 td->td_si.si_signo = 0;
3001 * Keep looking if the debugger discarded or
3002 * replaced the signal.
3008 * If the signal became masked, re-queue it.
3010 if (SIGISMEMBER(td->td_sigmask, sig)) {
3011 ksi.ksi_flags |= KSI_HEAD;
3012 sigqueue_add(&p->p_sigqueue, sig, &ksi);
3017 * If the traced bit got turned off, requeue
3018 * the signal and go back up to the top to
3019 * rescan signals. This ensures that p_sig*
3020 * and p_sigact are consistent.
3022 if ((p->p_flag & P_TRACED) == 0) {
3023 ksi.ksi_flags |= KSI_HEAD;
3024 sigqueue_add(queue, sig, &ksi);
3029 prop = sigprop(sig);
3032 * Decide whether the signal should be returned.
3033 * Return the signal's number, or fall through
3034 * to clear it from the pending mask.
3036 switch ((intptr_t)p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) {
3037 case (intptr_t)SIG_DFL:
3039 * Don't take default actions on system processes.
3041 if (p->p_pid <= 1) {
3044 * Are you sure you want to ignore SIGSEGV
3047 printf("Process (pid %lu) got signal %d\n",
3048 (u_long)p->p_pid, sig);
3050 break; /* == ignore */
3053 * If there is a pending stop signal to process with
3054 * default action, stop here, then clear the signal.
3055 * Traced or exiting processes should ignore stops.
3056 * Additionally, a member of an orphaned process group
3057 * should ignore tty stops.
3059 if (prop & SIGPROP_STOP) {
3060 mtx_unlock(&ps->ps_mtx);
3061 if ((p->p_flag & (P_TRACED | P_WEXIT |
3062 P_SINGLE_EXIT)) != 0 || ((p->p_pgrp->
3063 pg_flags & PGRP_ORPHANED) != 0 &&
3064 (prop & SIGPROP_TTYSTOP) != 0)) {
3065 mtx_lock(&ps->ps_mtx);
3066 break; /* == ignore */
3068 if (TD_SBDRY_INTR(td)) {
3069 KASSERT((td->td_flags & TDF_SBDRY) != 0,
3070 ("lost TDF_SBDRY"));
3071 mtx_lock(&ps->ps_mtx);
3074 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK,
3075 &p->p_mtx.lock_object, "Catching SIGSTOP");
3076 sigqueue_delete(&td->td_sigqueue, sig);
3077 sigqueue_delete(&p->p_sigqueue, sig);
3078 p->p_flag |= P_STOPPED_SIG;
3081 sig_suspend_threads(td, p, 0);
3082 thread_suspend_switch(td, p);
3084 mtx_lock(&ps->ps_mtx);
3086 } else if ((prop & SIGPROP_IGNORE) != 0 &&
3087 (td->td_flags & TDF_SIGWAIT) == 0) {
3089 * Default action is to ignore; drop it if
3090 * not in kern_sigtimedwait().
3092 break; /* == ignore */
3097 case (intptr_t)SIG_IGN:
3098 if ((td->td_flags & TDF_SIGWAIT) == 0)
3099 break; /* == ignore */
3105 * This signal has an action, let
3106 * postsig() process it.
3110 sigqueue_delete(&td->td_sigqueue, sig); /* take the signal! */
3111 sigqueue_delete(&p->p_sigqueue, sig);
3118 thread_stopped(struct proc *p)
3122 PROC_LOCK_ASSERT(p, MA_OWNED);
3123 PROC_SLOCK_ASSERT(p, MA_OWNED);
3127 if ((p->p_flag & P_STOPPED_SIG) && (n == p->p_numthreads)) {
3129 p->p_flag &= ~P_WAITED;
3130 PROC_LOCK(p->p_pptr);
3131 childproc_stopped(p, (p->p_flag & P_TRACED) ?
3132 CLD_TRAPPED : CLD_STOPPED);
3133 PROC_UNLOCK(p->p_pptr);
3139 * Take the action for the specified signal
3140 * from the current set of pending signals.
3150 sigset_t returnmask;
3152 KASSERT(sig != 0, ("postsig"));
3156 PROC_LOCK_ASSERT(p, MA_OWNED);
3158 mtx_assert(&ps->ps_mtx, MA_OWNED);
3159 ksiginfo_init(&ksi);
3160 if (sigqueue_get(&td->td_sigqueue, sig, &ksi) == 0 &&
3161 sigqueue_get(&p->p_sigqueue, sig, &ksi) == 0)
3163 ksi.ksi_signo = sig;
3164 if (ksi.ksi_code == SI_TIMER)
3165 itimer_accept(p, ksi.ksi_timerid, &ksi);
3166 action = ps->ps_sigact[_SIG_IDX(sig)];
3168 if (KTRPOINT(td, KTR_PSIG))
3169 ktrpsig(sig, action, td->td_pflags & TDP_OLDMASK ?
3170 &td->td_oldsigmask : &td->td_sigmask, ksi.ksi_code);
3173 if (action == SIG_DFL) {
3175 * Default action, where the default is to kill
3176 * the process. (Other cases were ignored above.)
3178 mtx_unlock(&ps->ps_mtx);
3179 proc_td_siginfo_capture(td, &ksi.ksi_info);
3184 * If we get here, the signal must be caught.
3186 KASSERT(action != SIG_IGN, ("postsig action %p", action));
3187 KASSERT(!SIGISMEMBER(td->td_sigmask, sig),
3188 ("postsig action: blocked sig %d", sig));
3191 * Set the new mask value and also defer further
3192 * occurrences of this signal.
3194 * Special case: user has done a sigsuspend. Here the
3195 * current mask is not of interest, but rather the
3196 * mask from before the sigsuspend is what we want
3197 * restored after the signal processing is completed.
3199 if (td->td_pflags & TDP_OLDMASK) {
3200 returnmask = td->td_oldsigmask;
3201 td->td_pflags &= ~TDP_OLDMASK;
3203 returnmask = td->td_sigmask;
3205 if (p->p_sig == sig) {
3208 (*p->p_sysent->sv_sendsig)(action, &ksi, &returnmask);
3209 postsig_done(sig, td, ps);
3215 sig_ast_checksusp(struct thread *td)
3221 PROC_LOCK_ASSERT(p, MA_OWNED);
3223 if ((td->td_flags & TDF_NEEDSUSPCHK) == 0)
3226 ret = thread_suspend_check(1);
3227 MPASS(ret == 0 || ret == EINTR || ret == ERESTART);
3232 sig_ast_needsigchk(struct thread *td)
3239 PROC_LOCK_ASSERT(p, MA_OWNED);
3241 if ((td->td_flags & TDF_NEEDSIGCHK) == 0)
3245 mtx_lock(&ps->ps_mtx);
3248 mtx_unlock(&ps->ps_mtx);
3249 KASSERT((td->td_flags & TDF_SBDRY) != 0, ("lost TDF_SBDRY"));
3250 KASSERT(TD_SBDRY_INTR(td),
3251 ("lost TDF_SERESTART of TDF_SEINTR"));
3252 KASSERT((td->td_flags & (TDF_SEINTR | TDF_SERESTART)) !=
3253 (TDF_SEINTR | TDF_SERESTART),
3254 ("both TDF_SEINTR and TDF_SERESTART"));
3255 ret = TD_SBDRY_ERRNO(td);
3256 } else if (sig != 0) {
3257 ret = SIGISMEMBER(ps->ps_sigintr, sig) ? EINTR : ERESTART;
3258 mtx_unlock(&ps->ps_mtx);
3260 mtx_unlock(&ps->ps_mtx);
3265 * Do not go into sleep if this thread was the ptrace(2)
3266 * attach leader. cursig() consumed SIGSTOP from PT_ATTACH,
3267 * but we usually act on the signal by interrupting sleep, and
3268 * should do that here as well.
3270 if ((td->td_dbgflags & TDB_FSTP) != 0) {
3273 td->td_dbgflags &= ~TDB_FSTP;
3287 if ((td->td_flags & (TDF_NEEDSIGCHK | TDF_NEEDSUSPCHK)) == 0)
3293 ret = sig_ast_checksusp(td);
3295 ret = sig_ast_needsigchk(td);
3301 proc_wkilled(struct proc *p)
3304 PROC_LOCK_ASSERT(p, MA_OWNED);
3305 if ((p->p_flag & P_WKILLED) == 0) {
3306 p->p_flag |= P_WKILLED;
3308 * Notify swapper that there is a process to swap in.
3309 * The notification is racy, at worst it would take 10
3310 * seconds for the swapper process to notice.
3312 if ((p->p_flag & (P_INMEM | P_SWAPPINGIN)) == 0)
3318 * Kill the current process for stated reason.
3321 killproc(struct proc *p, const char *why)
3324 PROC_LOCK_ASSERT(p, MA_OWNED);
3325 CTR3(KTR_PROC, "killproc: proc %p (pid %d, %s)", p, p->p_pid,
3327 log(LOG_ERR, "pid %d (%s), jid %d, uid %d, was killed: %s\n",
3328 p->p_pid, p->p_comm, p->p_ucred->cr_prison->pr_id,
3329 p->p_ucred->cr_uid, why);
3331 kern_psignal(p, SIGKILL);
3335 * Force the current process to exit with the specified signal, dumping core
3336 * if appropriate. We bypass the normal tests for masked and caught signals,
3337 * allowing unrecoverable failures to terminate the process without changing
3338 * signal state. Mark the accounting record with the signal termination.
3339 * If dumping core, save the signal number for the debugger. Calls exit and
3343 sigexit(struct thread *td, int sig)
3345 struct proc *p = td->td_proc;
3347 PROC_LOCK_ASSERT(p, MA_OWNED);
3348 p->p_acflag |= AXSIG;
3350 * We must be single-threading to generate a core dump. This
3351 * ensures that the registers in the core file are up-to-date.
3352 * Also, the ELF dump handler assumes that the thread list doesn't
3353 * change out from under it.
3355 * XXX If another thread attempts to single-thread before us
3356 * (e.g. via fork()), we won't get a dump at all.
3358 if ((sigprop(sig) & SIGPROP_CORE) &&
3359 thread_single(p, SINGLE_NO_EXIT) == 0) {
3362 * Log signals which would cause core dumps
3363 * (Log as LOG_INFO to appease those who don't want
3365 * XXX : Todo, as well as euid, write out ruid too
3366 * Note that coredump() drops proc lock.
3368 if (coredump(td) == 0)
3370 if (kern_logsigexit)
3372 "pid %d (%s), jid %d, uid %d: exited on "
3373 "signal %d%s\n", p->p_pid, p->p_comm,
3374 p->p_ucred->cr_prison->pr_id,
3375 td->td_ucred->cr_uid,
3377 sig & WCOREFLAG ? " (core dumped)" : "");
3385 * Send queued SIGCHLD to parent when child process's state
3389 sigparent(struct proc *p, int reason, int status)
3391 PROC_LOCK_ASSERT(p, MA_OWNED);
3392 PROC_LOCK_ASSERT(p->p_pptr, MA_OWNED);
3394 if (p->p_ksi != NULL) {
3395 p->p_ksi->ksi_signo = SIGCHLD;
3396 p->p_ksi->ksi_code = reason;
3397 p->p_ksi->ksi_status = status;
3398 p->p_ksi->ksi_pid = p->p_pid;
3399 p->p_ksi->ksi_uid = p->p_ucred->cr_ruid;
3400 if (KSI_ONQ(p->p_ksi))
3403 pksignal(p->p_pptr, SIGCHLD, p->p_ksi);
3407 childproc_jobstate(struct proc *p, int reason, int sig)
3411 PROC_LOCK_ASSERT(p, MA_OWNED);
3412 PROC_LOCK_ASSERT(p->p_pptr, MA_OWNED);
3415 * Wake up parent sleeping in kern_wait(), also send
3416 * SIGCHLD to parent, but SIGCHLD does not guarantee
3417 * that parent will awake, because parent may masked
3420 p->p_pptr->p_flag |= P_STATCHILD;
3423 ps = p->p_pptr->p_sigacts;
3424 mtx_lock(&ps->ps_mtx);
3425 if ((ps->ps_flag & PS_NOCLDSTOP) == 0) {
3426 mtx_unlock(&ps->ps_mtx);
3427 sigparent(p, reason, sig);
3429 mtx_unlock(&ps->ps_mtx);
3433 childproc_stopped(struct proc *p, int reason)
3436 childproc_jobstate(p, reason, p->p_xsig);
3440 childproc_continued(struct proc *p)
3442 childproc_jobstate(p, CLD_CONTINUED, SIGCONT);
3446 childproc_exited(struct proc *p)
3450 if (WCOREDUMP(p->p_xsig)) {
3451 reason = CLD_DUMPED;
3452 status = WTERMSIG(p->p_xsig);
3453 } else if (WIFSIGNALED(p->p_xsig)) {
3454 reason = CLD_KILLED;
3455 status = WTERMSIG(p->p_xsig);
3457 reason = CLD_EXITED;
3458 status = p->p_xexit;
3461 * XXX avoid calling wakeup(p->p_pptr), the work is
3464 sigparent(p, reason, status);
3467 #define MAX_NUM_CORE_FILES 100000
3468 #ifndef NUM_CORE_FILES
3469 #define NUM_CORE_FILES 5
3471 CTASSERT(NUM_CORE_FILES >= 0 && NUM_CORE_FILES <= MAX_NUM_CORE_FILES);
3472 static int num_cores = NUM_CORE_FILES;
3475 sysctl_debug_num_cores_check (SYSCTL_HANDLER_ARGS)
3480 new_val = num_cores;
3481 error = sysctl_handle_int(oidp, &new_val, 0, req);
3482 if (error != 0 || req->newptr == NULL)
3484 if (new_val > MAX_NUM_CORE_FILES)
3485 new_val = MAX_NUM_CORE_FILES;
3488 num_cores = new_val;
3491 SYSCTL_PROC(_debug, OID_AUTO, ncores,
3492 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 0, sizeof(int),
3493 sysctl_debug_num_cores_check, "I",
3494 "Maximum number of generated process corefiles while using index format");
3496 #define GZIP_SUFFIX ".gz"
3497 #define ZSTD_SUFFIX ".zst"
3499 int compress_user_cores = 0;
3502 sysctl_compress_user_cores(SYSCTL_HANDLER_ARGS)
3506 val = compress_user_cores;
3507 error = sysctl_handle_int(oidp, &val, 0, req);
3508 if (error != 0 || req->newptr == NULL)
3510 if (val != 0 && !compressor_avail(val))
3512 compress_user_cores = val;
3515 SYSCTL_PROC(_kern, OID_AUTO, compress_user_cores,
3516 CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_NEEDGIANT, 0, sizeof(int),
3517 sysctl_compress_user_cores, "I",
3518 "Enable compression of user corefiles ("
3519 __XSTRING(COMPRESS_GZIP) " = gzip, "
3520 __XSTRING(COMPRESS_ZSTD) " = zstd)");
3522 int compress_user_cores_level = 6;
3523 SYSCTL_INT(_kern, OID_AUTO, compress_user_cores_level, CTLFLAG_RWTUN,
3524 &compress_user_cores_level, 0,
3525 "Corefile compression level");
3528 * Protect the access to corefilename[] by allproc_lock.
3530 #define corefilename_lock allproc_lock
3532 static char corefilename[MAXPATHLEN] = {"%N.core"};
3533 TUNABLE_STR("kern.corefile", corefilename, sizeof(corefilename));
3536 sysctl_kern_corefile(SYSCTL_HANDLER_ARGS)
3540 sx_xlock(&corefilename_lock);
3541 error = sysctl_handle_string(oidp, corefilename, sizeof(corefilename),
3543 sx_xunlock(&corefilename_lock);
3547 SYSCTL_PROC(_kern, OID_AUTO, corefile, CTLTYPE_STRING | CTLFLAG_RW |
3548 CTLFLAG_MPSAFE, 0, 0, sysctl_kern_corefile, "A",
3549 "Process corefile name format string");
3552 vnode_close_locked(struct thread *td, struct vnode *vp)
3556 vn_close(vp, FWRITE, td->td_ucred, td);
3560 * If the core format has a %I in it, then we need to check
3561 * for existing corefiles before defining a name.
3562 * To do this we iterate over 0..ncores to find a
3563 * non-existing core file name to use. If all core files are
3564 * already used we choose the oldest one.
3567 corefile_open_last(struct thread *td, char *name, int indexpos,
3568 int indexlen, int ncores, struct vnode **vpp)
3570 struct vnode *oldvp, *nextvp, *vp;
3572 struct nameidata nd;
3573 int error, i, flags, oflags, cmode;
3575 struct timespec lasttime;
3577 nextvp = oldvp = NULL;
3578 cmode = S_IRUSR | S_IWUSR;
3579 oflags = VN_OPEN_NOAUDIT | VN_OPEN_NAMECACHE |
3580 (capmode_coredump ? VN_OPEN_NOCAPCHECK : 0);
3582 for (i = 0; i < ncores; i++) {
3583 flags = O_CREAT | FWRITE | O_NOFOLLOW;
3585 ch = name[indexpos + indexlen];
3586 (void)snprintf(name + indexpos, indexlen + 1, "%.*u", indexlen,
3588 name[indexpos + indexlen] = ch;
3590 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, td);
3591 error = vn_open_cred(&nd, &flags, cmode, oflags, td->td_ucred,
3597 NDFREE(&nd, NDF_ONLY_PNBUF);
3598 if ((flags & O_CREAT) == O_CREAT) {
3603 error = VOP_GETATTR(vp, &vattr, td->td_ucred);
3605 vnode_close_locked(td, vp);
3609 if (oldvp == NULL ||
3610 lasttime.tv_sec > vattr.va_mtime.tv_sec ||
3611 (lasttime.tv_sec == vattr.va_mtime.tv_sec &&
3612 lasttime.tv_nsec >= vattr.va_mtime.tv_nsec)) {
3614 vn_close(oldvp, FWRITE, td->td_ucred, td);
3617 lasttime = vattr.va_mtime;
3619 vnode_close_locked(td, vp);
3623 if (oldvp != NULL) {
3624 if (nextvp == NULL) {
3625 if ((td->td_proc->p_flag & P_SUGID) != 0) {
3627 vn_close(oldvp, FWRITE, td->td_ucred, td);
3630 error = vn_lock(nextvp, LK_EXCLUSIVE);
3632 vn_close(nextvp, FWRITE, td->td_ucred,
3638 vn_close(oldvp, FWRITE, td->td_ucred, td);
3643 vnode_close_locked(td, oldvp);
3652 * corefile_open(comm, uid, pid, td, compress, vpp, namep)
3653 * Expand the name described in corefilename, using name, uid, and pid
3654 * and open/create core file.
3655 * corefilename is a printf-like string, with three format specifiers:
3656 * %N name of process ("name")
3657 * %P process id (pid)
3659 * For example, "%N.core" is the default; they can be disabled completely
3660 * by using "/dev/null", or all core files can be stored in "/cores/%U/%N-%P".
3661 * This is controlled by the sysctl variable kern.corefile (see above).
3664 corefile_open(const char *comm, uid_t uid, pid_t pid, struct thread *td,
3665 int compress, int signum, struct vnode **vpp, char **namep)
3668 struct nameidata nd;
3670 char *hostname, *name;
3671 int cmode, error, flags, i, indexpos, indexlen, oflags, ncores;
3674 format = corefilename;
3675 name = malloc(MAXPATHLEN, M_TEMP, M_WAITOK | M_ZERO);
3679 (void)sbuf_new(&sb, name, MAXPATHLEN, SBUF_FIXEDLEN);
3680 sx_slock(&corefilename_lock);
3681 for (i = 0; format[i] != '\0'; i++) {
3682 switch (format[i]) {
3683 case '%': /* Format character */
3685 switch (format[i]) {
3687 sbuf_putc(&sb, '%');
3689 case 'H': /* hostname */
3690 if (hostname == NULL) {
3691 hostname = malloc(MAXHOSTNAMELEN,
3694 getcredhostname(td->td_ucred, hostname,
3696 sbuf_printf(&sb, "%s", hostname);
3698 case 'I': /* autoincrementing index */
3699 if (indexpos != -1) {
3700 sbuf_printf(&sb, "%%I");
3704 indexpos = sbuf_len(&sb);
3705 sbuf_printf(&sb, "%u", ncores - 1);
3706 indexlen = sbuf_len(&sb) - indexpos;
3708 case 'N': /* process name */
3709 sbuf_printf(&sb, "%s", comm);
3711 case 'P': /* process id */
3712 sbuf_printf(&sb, "%u", pid);
3714 case 'S': /* signal number */
3715 sbuf_printf(&sb, "%i", signum);
3717 case 'U': /* user id */
3718 sbuf_printf(&sb, "%u", uid);
3722 "Unknown format character %c in "
3723 "corename `%s'\n", format[i], format);
3728 sbuf_putc(&sb, format[i]);
3732 sx_sunlock(&corefilename_lock);
3733 free(hostname, M_TEMP);
3734 if (compress == COMPRESS_GZIP)
3735 sbuf_printf(&sb, GZIP_SUFFIX);
3736 else if (compress == COMPRESS_ZSTD)
3737 sbuf_printf(&sb, ZSTD_SUFFIX);
3738 if (sbuf_error(&sb) != 0) {
3739 log(LOG_ERR, "pid %ld (%s), uid (%lu): corename is too "
3740 "long\n", (long)pid, comm, (u_long)uid);
3748 if (indexpos != -1) {
3749 error = corefile_open_last(td, name, indexpos, indexlen, ncores,
3753 "pid %d (%s), uid (%u): Path `%s' failed "
3754 "on initial open test, error = %d\n",
3755 pid, comm, uid, name, error);
3758 cmode = S_IRUSR | S_IWUSR;
3759 oflags = VN_OPEN_NOAUDIT | VN_OPEN_NAMECACHE |
3760 (capmode_coredump ? VN_OPEN_NOCAPCHECK : 0);
3761 flags = O_CREAT | FWRITE | O_NOFOLLOW;
3762 if ((td->td_proc->p_flag & P_SUGID) != 0)
3765 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, td);
3766 error = vn_open_cred(&nd, &flags, cmode, oflags, td->td_ucred,
3770 NDFREE(&nd, NDF_ONLY_PNBUF);
3776 audit_proc_coredump(td, name, error);
3786 * Dump a process' core. The main routine does some
3787 * policy checking, and creates the name of the coredump;
3788 * then it passes on a vnode and a size limit to the process-specific
3789 * coredump routine if there is one; if there _is not_ one, it returns
3790 * ENOSYS; otherwise it returns the error from the process-specific routine.
3794 coredump(struct thread *td)
3796 struct proc *p = td->td_proc;
3797 struct ucred *cred = td->td_ucred;
3801 size_t fullpathsize;
3802 int error, error1, locked;
3803 char *name; /* name of corefile */
3806 char *fullpath, *freepath = NULL;
3809 PROC_LOCK_ASSERT(p, MA_OWNED);
3810 MPASS((p->p_flag & P_HADTHREADS) == 0 || p->p_singlethread == td);
3812 if (!do_coredump || (!sugid_coredump && (p->p_flag & P_SUGID) != 0) ||
3813 (p->p_flag2 & P2_NOTRACE) != 0) {
3819 * Note that the bulk of limit checking is done after
3820 * the corefile is created. The exception is if the limit
3821 * for corefiles is 0, in which case we don't bother
3822 * creating the corefile at all. This layout means that
3823 * a corefile is truncated instead of not being created,
3824 * if it is larger than the limit.
3826 limit = (off_t)lim_cur(td, RLIMIT_CORE);
3827 if (limit == 0 || racct_get_available(p, RACCT_CORE) == 0) {
3833 error = corefile_open(p->p_comm, cred->cr_uid, p->p_pid, td,
3834 compress_user_cores, p->p_sig, &vp, &name);
3839 * Don't dump to non-regular files or files with links.
3840 * Do not dump into system files. Effective user must own the corefile.
3842 if (vp->v_type != VREG || VOP_GETATTR(vp, &vattr, cred) != 0 ||
3843 vattr.va_nlink != 1 || (vp->v_vflag & VV_SYSTEM) != 0 ||
3844 vattr.va_uid != cred->cr_uid) {
3852 /* Postpone other writers, including core dumps of other processes. */
3853 rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
3855 lf.l_whence = SEEK_SET;
3858 lf.l_type = F_WRLCK;
3859 locked = (VOP_ADVLOCK(vp, (caddr_t)p, F_SETLK, &lf, F_FLOCK) == 0);
3863 if (set_core_nodump_flag)
3864 vattr.va_flags = UF_NODUMP;
3865 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
3866 VOP_SETATTR(vp, &vattr, cred);
3869 p->p_acflag |= ACORE;
3872 if (p->p_sysent->sv_coredump != NULL) {
3873 error = p->p_sysent->sv_coredump(td, vp, limit, 0);
3879 lf.l_type = F_UNLCK;
3880 VOP_ADVLOCK(vp, (caddr_t)p, F_UNLCK, &lf, F_FLOCK);
3882 vn_rangelock_unlock(vp, rl_cookie);
3885 * Notify the userland helper that a process triggered a core dump.
3886 * This allows the helper to run an automated debugging session.
3888 if (error != 0 || coredump_devctl == 0)
3890 sb = sbuf_new_auto();
3891 if (vn_fullpath_global(p->p_textvp, &fullpath, &freepath) != 0)
3893 sbuf_printf(sb, "comm=\"");
3894 devctl_safe_quote_sb(sb, fullpath);
3895 free(freepath, M_TEMP);
3896 sbuf_printf(sb, "\" core=\"");
3899 * We can't lookup core file vp directly. When we're replacing a core, and
3900 * other random times, we flush the name cache, so it will fail. Instead,
3901 * if the path of the core is relative, add the current dir in front if it.
3903 if (name[0] != '/') {
3904 fullpathsize = MAXPATHLEN;
3905 freepath = malloc(fullpathsize, M_TEMP, M_WAITOK);
3906 if (vn_getcwd(freepath, &fullpath, &fullpathsize) != 0) {
3907 free(freepath, M_TEMP);
3910 devctl_safe_quote_sb(sb, fullpath);
3911 free(freepath, M_TEMP);
3914 devctl_safe_quote_sb(sb, name);
3915 sbuf_printf(sb, "\"");
3916 if (sbuf_finish(sb) == 0)
3917 devctl_notify("kernel", "signal", "coredump", sbuf_data(sb));
3921 error1 = vn_close(vp, FWRITE, cred, td);
3925 audit_proc_coredump(td, name, error);
3932 * Nonexistent system call-- signal process (may want to handle it). Flag
3933 * error in case process won't see signal immediately (blocked or ignored).
3935 #ifndef _SYS_SYSPROTO_H_
3942 nosys(struct thread *td, struct nosys_args *args)
3949 tdsignal(td, SIGSYS);
3951 if (kern_lognosys == 1 || kern_lognosys == 3) {
3952 uprintf("pid %d comm %s: nosys %d\n", p->p_pid, p->p_comm,
3955 if (kern_lognosys == 2 || kern_lognosys == 3 ||
3956 (p->p_pid == 1 && (kern_lognosys & 3) == 0)) {
3957 printf("pid %d comm %s: nosys %d\n", p->p_pid, p->p_comm,
3964 * Send a SIGIO or SIGURG signal to a process or process group using stored
3965 * credentials rather than those of the current process.
3968 pgsigio(struct sigio **sigiop, int sig, int checkctty)
3971 struct sigio *sigio;
3973 ksiginfo_init(&ksi);
3974 ksi.ksi_signo = sig;
3975 ksi.ksi_code = SI_KERNEL;
3979 if (sigio == NULL) {
3983 if (sigio->sio_pgid > 0) {
3984 PROC_LOCK(sigio->sio_proc);
3985 if (CANSIGIO(sigio->sio_ucred, sigio->sio_proc->p_ucred))
3986 kern_psignal(sigio->sio_proc, sig);
3987 PROC_UNLOCK(sigio->sio_proc);
3988 } else if (sigio->sio_pgid < 0) {
3991 PGRP_LOCK(sigio->sio_pgrp);
3992 LIST_FOREACH(p, &sigio->sio_pgrp->pg_members, p_pglist) {
3994 if (p->p_state == PRS_NORMAL &&
3995 CANSIGIO(sigio->sio_ucred, p->p_ucred) &&
3996 (checkctty == 0 || (p->p_flag & P_CONTROLT)))
3997 kern_psignal(p, sig);
4000 PGRP_UNLOCK(sigio->sio_pgrp);
4006 filt_sigattach(struct knote *kn)
4008 struct proc *p = curproc;
4010 kn->kn_ptr.p_proc = p;
4011 kn->kn_flags |= EV_CLEAR; /* automatically set */
4013 knlist_add(p->p_klist, kn, 0);
4019 filt_sigdetach(struct knote *kn)
4021 struct proc *p = kn->kn_ptr.p_proc;
4023 knlist_remove(p->p_klist, kn, 0);
4027 * signal knotes are shared with proc knotes, so we apply a mask to
4028 * the hint in order to differentiate them from process hints. This
4029 * could be avoided by using a signal-specific knote list, but probably
4030 * isn't worth the trouble.
4033 filt_signal(struct knote *kn, long hint)
4036 if (hint & NOTE_SIGNAL) {
4037 hint &= ~NOTE_SIGNAL;
4039 if (kn->kn_id == hint)
4042 return (kn->kn_data != 0);
4050 ps = malloc(sizeof(struct sigacts), M_SUBPROC, M_WAITOK | M_ZERO);
4051 refcount_init(&ps->ps_refcnt, 1);
4052 mtx_init(&ps->ps_mtx, "sigacts", NULL, MTX_DEF);
4057 sigacts_free(struct sigacts *ps)
4060 if (refcount_release(&ps->ps_refcnt) == 0)
4062 mtx_destroy(&ps->ps_mtx);
4063 free(ps, M_SUBPROC);
4067 sigacts_hold(struct sigacts *ps)
4070 refcount_acquire(&ps->ps_refcnt);
4075 sigacts_copy(struct sigacts *dest, struct sigacts *src)
4078 KASSERT(dest->ps_refcnt == 1, ("sigacts_copy to shared dest"));
4079 mtx_lock(&src->ps_mtx);
4080 bcopy(src, dest, offsetof(struct sigacts, ps_refcnt));
4081 mtx_unlock(&src->ps_mtx);
4085 sigacts_shared(struct sigacts *ps)
4088 return (ps->ps_refcnt > 1);
4092 sig_drop_caught(struct proc *p)
4098 PROC_LOCK_ASSERT(p, MA_OWNED);
4099 mtx_assert(&ps->ps_mtx, MA_OWNED);
4100 while (SIGNOTEMPTY(ps->ps_sigcatch)) {
4101 sig = sig_ffs(&ps->ps_sigcatch);
4103 if ((sigprop(sig) & SIGPROP_IGNORE) != 0)
4104 sigqueue_delete_proc(p, sig);
4109 sigfastblock_failed(struct thread *td, bool sendsig, bool write)
4114 * Prevent further fetches and SIGSEGVs, allowing thread to
4115 * issue syscalls despite corruption.
4117 sigfastblock_clear(td);
4121 ksiginfo_init_trap(&ksi);
4122 ksi.ksi_signo = SIGSEGV;
4123 ksi.ksi_code = write ? SEGV_ACCERR : SEGV_MAPERR;
4124 ksi.ksi_addr = td->td_sigblock_ptr;
4125 trapsignal(td, &ksi);
4129 sigfastblock_fetch_sig(struct thread *td, bool sendsig, uint32_t *valp)
4133 if ((td->td_pflags & TDP_SIGFASTBLOCK) == 0)
4135 if (fueword32((void *)td->td_sigblock_ptr, &res) == -1) {
4136 sigfastblock_failed(td, sendsig, false);
4140 td->td_sigblock_val = res & ~SIGFASTBLOCK_FLAGS;
4145 sigfastblock_resched(struct thread *td, bool resched)
4152 reschedule_signals(p, td->td_sigmask, 0);
4156 td->td_flags |= TDF_ASTPENDING | TDF_NEEDSIGCHK;
4161 sys_sigfastblock(struct thread *td, struct sigfastblock_args *uap)
4170 case SIGFASTBLOCK_SETPTR:
4171 if ((td->td_pflags & TDP_SIGFASTBLOCK) != 0) {
4175 if (((uintptr_t)(uap->ptr) & (sizeof(uint32_t) - 1)) != 0) {
4179 td->td_pflags |= TDP_SIGFASTBLOCK;
4180 td->td_sigblock_ptr = uap->ptr;
4183 case SIGFASTBLOCK_UNBLOCK:
4184 if ((td->td_pflags & TDP_SIGFASTBLOCK) == 0) {
4190 res = casueword32(td->td_sigblock_ptr,
4191 SIGFASTBLOCK_PEND, &oldval, 0);
4194 sigfastblock_failed(td, false, true);
4200 if (oldval != SIGFASTBLOCK_PEND) {
4204 error = thread_check_susp(td, false);
4212 * td_sigblock_val is cleared there, but not on a
4213 * syscall exit. The end effect is that a single
4214 * interruptible sleep, while user sigblock word is
4215 * set, might return EINTR or ERESTART to usermode
4216 * without delivering signal. All further sleeps,
4217 * until userspace clears the word and does
4218 * sigfastblock(UNBLOCK), observe current word and no
4219 * longer get interrupted. It is slight
4220 * non-conformance, with alternative to have read the
4221 * sigblock word on each syscall entry.
4223 td->td_sigblock_val = 0;
4226 * Rely on normal ast mechanism to deliver pending
4227 * signals to current thread. But notify others about
4230 sigfastblock_resched(td, error == 0 && p->p_numthreads != 1);
4234 case SIGFASTBLOCK_UNSETPTR:
4235 if ((td->td_pflags & TDP_SIGFASTBLOCK) == 0) {
4239 if (!sigfastblock_fetch_sig(td, false, &oldval)) {
4243 if (oldval != 0 && oldval != SIGFASTBLOCK_PEND) {
4247 sigfastblock_clear(td);
4258 sigfastblock_clear(struct thread *td)
4262 if ((td->td_pflags & TDP_SIGFASTBLOCK) == 0)
4264 td->td_sigblock_val = 0;
4265 resched = (td->td_pflags & TDP_SIGFASTPENDING) != 0 ||
4267 td->td_pflags &= ~(TDP_SIGFASTBLOCK | TDP_SIGFASTPENDING);
4268 sigfastblock_resched(td, resched);
4272 sigfastblock_fetch(struct thread *td)
4276 (void)sigfastblock_fetch_sig(td, true, &val);
4280 sigfastblock_setpend1(struct thread *td)
4285 if ((td->td_pflags & TDP_SIGFASTPENDING) == 0)
4287 res = fueword32((void *)td->td_sigblock_ptr, &oldval);
4289 sigfastblock_failed(td, true, false);
4293 res = casueword32(td->td_sigblock_ptr, oldval, &oldval,
4294 oldval | SIGFASTBLOCK_PEND);
4296 sigfastblock_failed(td, true, true);
4300 td->td_sigblock_val = oldval & ~SIGFASTBLOCK_FLAGS;
4301 td->td_pflags &= ~TDP_SIGFASTPENDING;
4305 if (thread_check_susp(td, false) != 0)
4311 sigfastblock_setpend(struct thread *td, bool resched)
4315 sigfastblock_setpend1(td);
4319 reschedule_signals(p, fastblock_mask, SIGPROCMASK_FASTBLK);