56 static void __user *sig_handler(struct task_struct *t, int sig)  in sig_handler()  argument
58 	return t->sighand->action[sig - 1].sa.sa_handler;  in sig_handler()
61 static int sig_handler_ignored(void __user *handler, int sig)  in sig_handler_ignored()  argument
65 		(handler == SIG_DFL && sig_kernel_ignore(sig));  in sig_handler_ignored()
68 static int sig_task_ignored(struct task_struct *t, int sig, bool force)  in sig_task_ignored()  argument
72 	handler = sig_handler(t, sig);  in sig_task_ignored()
78 	return sig_handler_ignored(handler, sig);  in sig_task_ignored()
81 static int sig_ignored(struct task_struct *t, int sig, bool force)  in sig_ignored()  argument
88 	if (sigismember(&t->blocked, sig) || sigismember(&t->real_blocked, sig))  in sig_ignored()
91 	if (!sig_task_ignored(t, sig, force))  in sig_ignored()
112 			ready |= signal->sig[i] &~ blocked->sig[i];  in has_pending_signals()
115 	case 4: ready  = signal->sig[3] &~ blocked->sig[3];  in has_pending_signals()
116 		ready |= signal->sig[2] &~ blocked->sig[2];  in has_pending_signals()
117 		ready |= signal->sig[1] &~ blocked->sig[1];  in has_pending_signals()
118 		ready |= signal->sig[0] &~ blocked->sig[0];  in has_pending_signals()
121 	case 2: ready  = signal->sig[1] &~ blocked->sig[1];  in has_pending_signals()
122 		ready |= signal->sig[0] &~ blocked->sig[0];  in has_pending_signals()
125 	case 1: ready  = signal->sig[0] &~ blocked->sig[0];  in has_pending_signals()
174 	int sig = 0;  in next_signal()  local
176 	s = pending->signal.sig;  in next_signal()
177 	m = mask->sig;  in next_signal()
187 		sig = ffz(~x) + 1;  in next_signal()
188 		return sig;  in next_signal()
197 			sig = ffz(~x) + i*_NSIG_BPW + 1;  in next_signal()
206 		sig = ffz(~x) + _NSIG_BPW + 1;  in next_signal()
214 	return sig;  in next_signal()
217 static inline void print_dropped_signal(int sig)  in print_dropped_signal()  argument
228 				current->comm, current->pid, sig);  in print_dropped_signal()
331 	struct signal_struct *sig = task->signal;  in task_participate_group_stop()  local
341 	if (!WARN_ON_ONCE(sig->group_stop_count == 0))  in task_participate_group_stop()
342 		sig->group_stop_count--;  in task_participate_group_stop()
348 	if (!sig->group_stop_count && !(sig->flags & SIGNAL_STOP_STOPPED)) {  in task_participate_group_stop()
349 		sig->flags = SIGNAL_STOP_STOPPED;  in task_participate_group_stop()
361 __sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags, int override_rlimit)  in __sigqueue_alloc()  argument
380 		print_dropped_signal(sig);  in __sigqueue_alloc()
439 		int sig = q->info.si_signo;  in __flush_itimer_signals()  local
442 			sigaddset(&retain, sig);  in __flush_itimer_signals()
444 			sigdelset(&signal, sig);  in __flush_itimer_signals()
495 int unhandled_signal(struct task_struct *tsk, int sig)  in unhandled_signal()  argument
497 	void __user *handler = tsk->sighand->action[sig-1].sa.sa_handler;  in unhandled_signal()
506 static void collect_signal(int sig, struct sigpending *list, siginfo_t *info)  in collect_signal()  argument
515 		if (q->info.si_signo == sig) {  in collect_signal()
522 	sigdelset(&list->signal, sig);  in collect_signal()
535 		info->si_signo = sig;  in collect_signal()
546 	int sig = next_signal(pending, mask);  in __dequeue_signal()  local
548 	if (sig)  in __dequeue_signal()
549 		collect_signal(sig, pending, info);  in __dequeue_signal()
550 	return sig;  in __dequeue_signal()
713 static int check_kill_permission(int sig, struct siginfo *info,  in check_kill_permission()  argument
719 	if (!valid_signal(sig))  in check_kill_permission()
725 	error = audit_signal_info(sig, t); /* Let audit system see the signal */  in check_kill_permission()
731 		switch (sig) {  in check_kill_permission()
745 	return security_task_kill(t, info, sig, 0);  in check_kill_permission()
784 static bool prepare_signal(int sig, struct task_struct *p, bool force)  in prepare_signal()  argument
792 			return sig == SIGKILL;  in prepare_signal()
796 	} else if (sig_kernel_stop(sig)) {  in prepare_signal()
804 	} else if (sig == SIGCONT) {  in prepare_signal()
846 	return !sig_ignored(p, sig, force);  in prepare_signal()
857 static inline int wants_signal(int sig, struct task_struct *p)  in wants_signal()  argument
859 	if (sigismember(&p->blocked, sig))  in wants_signal()
863 	if (sig == SIGKILL)  in wants_signal()
870 static void complete_signal(int sig, struct task_struct *p, int group)  in complete_signal()  argument
881 	if (wants_signal(sig, p))  in complete_signal()
894 		while (!wants_signal(sig, t)) {  in complete_signal()
911 	if (sig_fatal(p, sig) &&  in complete_signal()
913 	    !sigismember(&t->real_blocked, sig) &&  in complete_signal()
914 	    (sig == SIGKILL || !t->ptrace)) {  in complete_signal()
918 		if (!sig_kernel_coredump(sig)) {  in complete_signal()
926 			signal->group_exit_code = sig;  in complete_signal()
942 	signal_wake_up(t, sig == SIGKILL);  in complete_signal()
946 static inline int legacy_queue(struct sigpending *signals, int sig)  in legacy_queue()  argument
948 	return (sig < SIGRTMIN) && sigismember(&signals->signal, sig);  in legacy_queue()
972 static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,  in __send_signal()  argument
983 	if (!prepare_signal(sig, t,  in __send_signal()
994 	if (legacy_queue(pending, sig))  in __send_signal()
1014 	if (sig < SIGRTMIN)  in __send_signal()
1019 	q = __sigqueue_alloc(sig, t, GFP_ATOMIC | __GFP_NOTRACK_FALSE_POSITIVE,  in __send_signal()
1025 			q->info.si_signo = sig;  in __send_signal()
1033 			q->info.si_signo = sig;  in __send_signal()
1049 		if (sig >= SIGRTMIN && info->si_code != SI_USER) {  in __send_signal()
1068 	signalfd_notify(t, sig);  in __send_signal()
1069 	sigaddset(&pending->signal, sig);  in __send_signal()
1070 	complete_signal(sig, t, group);  in __send_signal()
1072 	trace_signal_generate(sig, info, t, group, result);  in __send_signal()
1076 static int send_signal(int sig, struct siginfo *info, struct task_struct *t,  in send_signal()  argument
1086 	return __send_signal(sig, info, t, group, from_ancestor_ns);  in send_signal()
1123 __group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p)  in __group_send_sig_info()  argument
1125 	return send_signal(sig, info, p, 1);  in __group_send_sig_info()
1129 specific_send_sig_info(int sig, struct siginfo *info, struct task_struct *t)  in specific_send_sig_info()  argument
1131 	return send_signal(sig, info, t, 0);  in specific_send_sig_info()
1134 int do_send_sig_info(int sig, struct siginfo *info, struct task_struct *p,  in do_send_sig_info()  argument
1141 		ret = send_signal(sig, info, p, group);  in do_send_sig_info()
1160 force_sig_info(int sig, struct siginfo *info, struct task_struct *t)  in force_sig_info()  argument
1167 	action = &t->sighand->action[sig-1];  in force_sig_info()
1169 	blocked = sigismember(&t->blocked, sig);  in force_sig_info()
1173 			sigdelset(&t->blocked, sig);  in force_sig_info()
1179 	ret = specific_send_sig_info(sig, info, t);  in force_sig_info()
1254 int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p)  in group_send_sig_info()  argument
1259 	ret = check_kill_permission(sig, info, p);  in group_send_sig_info()
1262 	if (!ret && sig)  in group_send_sig_info()
1263 		ret = do_send_sig_info(sig, info, p, true);  in group_send_sig_info()
1273 int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp)  in __kill_pgrp_info()  argument
1281 		int err = group_send_sig_info(sig, info, p);  in __kill_pgrp_info()
1288 int kill_pid_info(int sig, struct siginfo *info, struct pid *pid)  in kill_pid_info()  argument
1297 			error = group_send_sig_info(sig, info, p);  in kill_pid_info()
1310 int kill_proc_info(int sig, struct siginfo *info, pid_t pid)  in kill_proc_info()  argument
1314 	error = kill_pid_info(sig, info, find_vpid(pid));  in kill_proc_info()
1330 int kill_pid_info_as_cred(int sig, struct siginfo *info, struct pid *pid,  in kill_pid_info_as_cred()  argument
1337 	if (!valid_signal(sig))  in kill_pid_info_as_cred()
1350 	ret = security_task_kill(p, info, sig, secid);  in kill_pid_info_as_cred()
1354 	if (sig) {  in kill_pid_info_as_cred()
1356 			ret = __send_signal(sig, info, p, 1, 0);  in kill_pid_info_as_cred()
1374 static int kill_something_info(int sig, struct siginfo *info, pid_t pid)  in kill_something_info()  argument
1380 		ret = kill_pid_info(sig, info, find_vpid(pid));  in kill_something_info()
1387 		ret = __kill_pgrp_info(sig, info,  in kill_something_info()
1396 				int err = group_send_sig_info(sig, info, p);  in kill_something_info()
1413 int send_sig_info(int sig, struct siginfo *info, struct task_struct *p)  in send_sig_info()  argument
1419 	if (!valid_signal(sig))  in send_sig_info()
1422 	return do_send_sig_info(sig, info, p, false);  in send_sig_info()
1429 send_sig(int sig, struct task_struct *p, int priv)  in send_sig()  argument
1431 	return send_sig_info(sig, __si_special(priv), p);  in send_sig()
1435 force_sig(int sig, struct task_struct *p)  in force_sig()  argument
1437 	force_sig_info(sig, SEND_SIG_PRIV, p);  in force_sig()
1447 force_sigsegv(int sig, struct task_struct *p)  in force_sigsegv()  argument
1449 	if (sig == SIGSEGV) {  in force_sigsegv()
1452 		p->sighand->action[sig - 1].sa.sa_handler = SIG_DFL;  in force_sigsegv()
1459 int kill_pgrp(struct pid *pid, int sig, int priv)  in kill_pgrp()  argument
1464 	ret = __kill_pgrp_info(sig, __si_special(priv), pid);  in kill_pgrp()
1471 int kill_pid(struct pid *pid, int sig, int priv)  in kill_pid()  argument
1473 	return kill_pid_info(sig, __si_special(priv), pid);  in kill_pid()
1523 	int sig = q->info.si_signo;  in send_sigqueue()  local
1536 	if (!prepare_signal(sig, t, false))  in send_sigqueue()
1552 	signalfd_notify(t, sig);  in send_sigqueue()
1555 	sigaddset(&pending->signal, sig);  in send_sigqueue()
1556 	complete_signal(sig, t, group);  in send_sigqueue()
1559 	trace_signal_generate(sig, &q->info, t, group, result);  in send_sigqueue()
1572 bool do_notify_parent(struct task_struct *tsk, int sig)  in do_notify_parent()  argument
1580 	BUG_ON(sig == -1);  in do_notify_parent()
1588 	if (sig != SIGCHLD) {  in do_notify_parent()
1594 			sig = SIGCHLD;  in do_notify_parent()
1597 	info.si_signo = sig;  in do_notify_parent()
1632 	if (!tsk->ptrace && sig == SIGCHLD &&  in do_notify_parent()
1652 			sig = 0;  in do_notify_parent()
1654 	if (valid_signal(sig) && sig)  in do_notify_parent()
1655 		__group_send_sig_info(sig, &info, tsk->parent);  in do_notify_parent()
1949 	struct signal_struct *sig = current->signal;  in do_signal_stop()  local
1959 		    unlikely(signal_group_exit(sig)))  in do_signal_stop()
1980 		if (!(sig->flags & SIGNAL_STOP_STOPPED))  in do_signal_stop()
1981 			sig->group_exit_code = signr;  in do_signal_stop()
1983 		sig->group_stop_count = 0;  in do_signal_stop()
1986 			sig->group_stop_count++;  in do_signal_stop()
1997 				sig->group_stop_count++;  in do_signal_stop()
2312 	ksig->sig = signr;  in get_signal()
2313 	return ksig->sig > 0;  in get_signal()
2338 		sigaddset(&blocked, ksig->sig);  in signal_delivered()
2346 		force_sigsegv(ksig->sig, current);  in signal_setup_done()
2755 	int sig;  in do_sigtimedwait()  local
2776 	sig = dequeue_signal(tsk, &mask, info);  in do_sigtimedwait()
2777 	if (!sig && timeout) {  in do_sigtimedwait()
2794 		sig = dequeue_signal(tsk, &mask, info);  in do_sigtimedwait()
2798 	if (sig)  in do_sigtimedwait()
2799 		return sig;  in do_sigtimedwait()
2847 SYSCALL_DEFINE2(kill, pid_t, pid, int, sig)  in SYSCALL_DEFINE2()  argument
2851 	info.si_signo = sig;  in SYSCALL_DEFINE2()
2857 	return kill_something_info(sig, &info, pid);  in SYSCALL_DEFINE2()
2861 do_send_specific(pid_t tgid, pid_t pid, int sig, struct siginfo *info)  in do_send_specific()  argument
2869 		error = check_kill_permission(sig, info, p);  in do_send_specific()
2874 		if (!error && sig) {  in do_send_specific()
2875 			error = do_send_sig_info(sig, info, p, false);  in do_send_specific()
2890 static int do_tkill(pid_t tgid, pid_t pid, int sig)  in do_tkill()  argument
2894 	info.si_signo = sig;  in do_tkill()
2900 	return do_send_specific(tgid, pid, sig, &info);  in do_tkill()
2913 SYSCALL_DEFINE3(tgkill, pid_t, tgid, pid_t, pid, int, sig)  in SYSCALL_DEFINE3()  argument
2919 	return do_tkill(tgid, pid, sig);  in SYSCALL_DEFINE3()
2929 SYSCALL_DEFINE2(tkill, pid_t, pid, int, sig)  in SYSCALL_DEFINE2()  argument
2935 	return do_tkill(0, pid, sig);  in SYSCALL_DEFINE2()
2938 static int do_rt_sigqueueinfo(pid_t pid, int sig, siginfo_t *info)  in do_rt_sigqueueinfo()  argument
2947 	info->si_signo = sig;  in do_rt_sigqueueinfo()
2950 	return kill_proc_info(sig, info, pid);  in do_rt_sigqueueinfo()
2959 SYSCALL_DEFINE3(rt_sigqueueinfo, pid_t, pid, int, sig,  in SYSCALL_DEFINE3()  argument
2965 	return do_rt_sigqueueinfo(pid, sig, &info);  in SYSCALL_DEFINE3()
2971 			int, sig,  in COMPAT_SYSCALL_DEFINE3()
2978 	return do_rt_sigqueueinfo(pid, sig, &info);  in COMPAT_SYSCALL_DEFINE3()
2982 static int do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig, siginfo_t *info)  in do_rt_tgsigqueueinfo()  argument
2995 	info->si_signo = sig;  in do_rt_tgsigqueueinfo()
2997 	return do_send_specific(tgid, pid, sig, info);  in do_rt_tgsigqueueinfo()
3000 SYSCALL_DEFINE4(rt_tgsigqueueinfo, pid_t, tgid, pid_t, pid, int, sig,  in SYSCALL_DEFINE4()  argument
3008 	return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);  in SYSCALL_DEFINE4()
3015 			int, sig,  in COMPAT_SYSCALL_DEFINE4()
3022 	return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);  in COMPAT_SYSCALL_DEFINE4()
3029 void kernel_sigaction(int sig, __sighandler_t action)  in kernel_sigaction()  argument
3032 	current->sighand->action[sig - 1].sa.sa_handler = action;  in kernel_sigaction()
3037 		sigaddset(&mask, sig);  in kernel_sigaction()
3047 int do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact)  in do_sigaction()  argument
3053 	if (!valid_signal(sig) || sig < 1 || (act && sig_kernel_only(sig)))  in do_sigaction()
3056 	k = &p->sighand->action[sig-1];  in do_sigaction()
3077 		if (sig_handler_ignored(sig_handler(p, sig), sig)) {  in do_sigaction()
3079 			sigaddset(&mask, sig);  in do_sigaction()
3256 	old_set = current->blocked.sig[0];  in SYSCALL_DEFINE3()
3272 			new_blocked.sig[0] = new_set;  in SYSCALL_DEFINE3()
3298 SYSCALL_DEFINE4(rt_sigaction, int, sig,  in SYSCALL_DEFINE4()  argument
3315 	ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL);  in SYSCALL_DEFINE4()
3325 COMPAT_SYSCALL_DEFINE4(rt_sigaction, int, sig,  in COMPAT_SYSCALL_DEFINE4()  argument
3356 	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);  in COMPAT_SYSCALL_DEFINE4()
3374 SYSCALL_DEFINE3(sigaction, int, sig,  in SYSCALL_DEFINE3()  argument
3395 	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);  in SYSCALL_DEFINE3()
3402 		    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))  in SYSCALL_DEFINE3()
3410 COMPAT_SYSCALL_DEFINE3(sigaction, int, sig,  in COMPAT_SYSCALL_DEFINE3()  argument
3435 	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);  in COMPAT_SYSCALL_DEFINE3()
3444 		    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))  in COMPAT_SYSCALL_DEFINE3()
3459 	return current->blocked.sig[0];  in SYSCALL_DEFINE0()
3464 	int old = current->blocked.sig[0];  in SYSCALL_DEFINE1()
3478 SYSCALL_DEFINE2(signal, int, sig, __sighandler_t, handler)  in SYSCALL_DEFINE2()  argument
3487 	ret = do_sigaction(sig, &new_sa, &old_sa);  in SYSCALL_DEFINE2()
3597 	int sig, new_t;  in kdb_send_sig_info()  local
3616 	sig = info->si_signo;  in kdb_send_sig_info()
3617 	if (send_sig_info(sig, info, t))  in kdb_send_sig_info()
3619 			   sig, t->pid);  in kdb_send_sig_info()
3621 		kdb_printf("Signal %d is sent to process %d.\n", sig, t->pid);  in kdb_send_sig_info()