69 static void __user *sig_handler(struct task_struct *t, int sig)  in sig_handler()  argument
71 	return t->sighand->action[sig - 1].sa.sa_handler;  in sig_handler()
81 static bool sig_task_ignored(struct task_struct *t, int sig, bool force)  in sig_task_ignored()  argument
85 	handler = sig_handler(t, sig);  in sig_task_ignored()
88 	if (unlikely(is_global_init(t) && sig_kernel_only(sig)))  in sig_task_ignored()
91 	if (unlikely(t->signal->flags & SIGNAL_UNKILLABLE) &&  in sig_task_ignored()
96 	if (unlikely((t->flags & PF_KTHREAD) &&  in sig_task_ignored()
103 static bool sig_ignored(struct task_struct *t, int sig, bool force)  in sig_ignored()  argument
110 	if (sigismember(&t->blocked, sig) || sigismember(&t->real_blocked, sig))  in sig_ignored()
118 	if (t->ptrace && sig != SIGKILL)  in sig_ignored()
121 	return sig_task_ignored(t, sig, force);  in sig_ignored()
156 static bool recalc_sigpending_tsk(struct task_struct *t)  in recalc_sigpending_tsk()  argument
158 	if ((t->jobctl & (JOBCTL_PENDING_MASK | JOBCTL_TRAP_FREEZE)) ||  in recalc_sigpending_tsk()
159 	    PENDING(&t->pending, &t->blocked) ||  in recalc_sigpending_tsk()
160 	    PENDING(&t->signal->shared_pending, &t->blocked) ||  in recalc_sigpending_tsk()
161 	    cgroup_task_frozen(t)) {  in recalc_sigpending_tsk()
162 		set_tsk_thread_flag(t, TIF_SIGPENDING);  in recalc_sigpending_tsk()
178 void recalc_sigpending_and_wake(struct task_struct *t)  in recalc_sigpending_and_wake()  argument
180 	if (recalc_sigpending_tsk(t))  in recalc_sigpending_and_wake()
181 		signal_wake_up(t, 0);  in recalc_sigpending_and_wake()
414 __sigqueue_alloc(int sig, struct task_struct *t, gfp_t gfp_flags,  in __sigqueue_alloc()  argument
430 	ucounts = task_ucounts(t);  in __sigqueue_alloc()
437 	if (override_rlimit || likely(sigpending <= task_rlimit(t, RLIMIT_SIGPENDING))) {  in __sigqueue_alloc()
479 void flush_signals(struct task_struct *t)  in flush_signals()  argument
483 	spin_lock_irqsave(&t->sighand->siglock, flags);  in flush_signals()
484 	clear_tsk_thread_flag(t, TIF_SIGPENDING);  in flush_signals()
485 	flush_sigqueue(&t->pending);  in flush_signals()
486 	flush_sigqueue(&t->signal->shared_pending);  in flush_signals()
487 	spin_unlock_irqrestore(&t->sighand->siglock, flags);  in flush_signals()
527 void ignore_signals(struct task_struct *t)  in ignore_signals()  argument
532 		t->sighand->action[i].sa.sa_handler = SIG_IGN;  in ignore_signals()
534 	flush_signals(t);  in ignore_signals()
542 flush_signal_handlers(struct task_struct *t, int force_default)  in flush_signal_handlers()  argument
545 	struct k_sigaction *ka = &t->sighand->action[0];  in flush_signal_handlers()
770 void signal_wake_up_state(struct task_struct *t, unsigned int state)  in signal_wake_up_state()  argument
772 	lockdep_assert_held(&t->sighand->siglock);  in signal_wake_up_state()
774 	set_tsk_thread_flag(t, TIF_SIGPENDING);  in signal_wake_up_state()
783 	if (!wake_up_state(t, state | TASK_INTERRUPTIBLE))  in signal_wake_up_state()
784 		kick_process(t);  in signal_wake_up_state()
825 static bool kill_ok_by_cred(struct task_struct *t)  in kill_ok_by_cred()  argument
828 	const struct cred *tcred = __task_cred(t);  in kill_ok_by_cred()
842 				 struct task_struct *t)  in check_kill_permission()  argument
853 	error = audit_signal_info(sig, t); /* Let audit system see the signal */  in check_kill_permission()
857 	if (!same_thread_group(current, t) &&  in check_kill_permission()
858 	    !kill_ok_by_cred(t)) {  in check_kill_permission()
861 			sid = task_session(t);  in check_kill_permission()
874 	return security_task_kill(t, info, sig, NULL);  in check_kill_permission()
894 static void ptrace_trap_notify(struct task_struct *t)  in ptrace_trap_notify()  argument
896 	WARN_ON_ONCE(!(t->ptrace & PT_SEIZED));  in ptrace_trap_notify()
897 	lockdep_assert_held(&t->sighand->siglock);  in ptrace_trap_notify()
899 	task_set_jobctl_pending(t, JOBCTL_TRAP_NOTIFY);  in ptrace_trap_notify()
900 	ptrace_signal_wake_up(t, t->jobctl & JOBCTL_LISTENING);  in ptrace_trap_notify()
916 	struct task_struct *t;  in prepare_signal()  local
932 		for_each_thread(p, t)  in prepare_signal()
933 			flush_sigqueue_mask(&flush, &t->pending);  in prepare_signal()
941 		for_each_thread(p, t) {  in prepare_signal()
942 			flush_sigqueue_mask(&flush, &t->pending);  in prepare_signal()
943 			task_clear_jobctl_pending(t, JOBCTL_STOP_PENDING);  in prepare_signal()
944 			if (likely(!(t->ptrace & PT_SEIZED))) {  in prepare_signal()
945 				t->jobctl &= ~JOBCTL_STOPPED;  in prepare_signal()
946 				wake_up_state(t, __TASK_STOPPED);  in prepare_signal()
948 				ptrace_trap_notify(t);  in prepare_signal()
1008 	struct task_struct *t;  in complete_signal()  local
1016 		t = p;  in complete_signal()
1027 		t = signal->curr_target;  in complete_signal()
1028 		while (!wants_signal(sig, t)) {  in complete_signal()
1029 			t = next_thread(t);  in complete_signal()
1030 			if (t == signal->curr_target)  in complete_signal()
1038 		signal->curr_target = t;  in complete_signal()
1047 	    !sigismember(&t->real_blocked, sig) &&  in complete_signal()
1062 			t = p;  in complete_signal()
1064 				task_clear_jobctl_pending(t, JOBCTL_PENDING_MASK);  in complete_signal()
1065 				sigaddset(&t->pending.signal, SIGKILL);  in complete_signal()
1066 				signal_wake_up(t, 1);  in complete_signal()
1067 			} while_each_thread(p, t);  in complete_signal()
1076 	signal_wake_up(t, sig == SIGKILL);  in complete_signal()
1086 				struct task_struct *t, enum pid_type type, bool force)  in __send_signal_locked()  argument
1093 	lockdep_assert_held(&t->sighand->siglock);  in __send_signal_locked()
1096 	if (!prepare_signal(sig, t, force))  in __send_signal_locked()
1099 	pending = (type != PIDTYPE_PID) ? &t->signal->shared_pending : &t->pending;  in __send_signal_locked()
1113 	if ((sig == SIGKILL) || (t->flags & PF_KTHREAD))  in __send_signal_locked()
1130 	q = __sigqueue_alloc(sig, t, GFP_ATOMIC, override_rlimit, 0);  in __send_signal_locked()
1141 							task_active_pid_ns(t));  in __send_signal_locked()
1144 				from_kuid_munged(task_cred_xxx(t, user_ns),  in __send_signal_locked()
1179 	signalfd_notify(t, sig);  in __send_signal_locked()
1185 		hlist_for_each_entry(delayed, &t->signal->multiprocess, node) {  in __send_signal_locked()
1196 	complete_signal(sig, t, type);  in __send_signal_locked()
1198 	trace_signal_generate(sig, info, t, type != PIDTYPE_PID, result);  in __send_signal_locked()
1227 		       struct task_struct *t, enum pid_type type)  in send_signal_locked()  argument
1234 		force = !task_pid_nr_ns(current, task_active_pid_ns(t));  in send_signal_locked()
1243 		t_user_ns = task_cred_xxx(t, user_ns);  in send_signal_locked()
1254 		if (!task_pid_nr_ns(current, task_active_pid_ns(t))) {  in send_signal_locked()
1259 	return __send_signal_locked(sig, info, t, type, force);  in send_signal_locked()
1337 force_sig_info_to_task(struct kernel_siginfo *info, struct task_struct *t,  in force_sig_info_to_task()  argument
1345 	spin_lock_irqsave(&t->sighand->siglock, flags);  in force_sig_info_to_task()
1346 	action = &t->sighand->action[sig-1];  in force_sig_info_to_task()
1348 	blocked = sigismember(&t->blocked, sig);  in force_sig_info_to_task()
1354 			sigdelset(&t->blocked, sig);  in force_sig_info_to_task()
1355 			recalc_sigpending_and_wake(t);  in force_sig_info_to_task()
1363 	    (!t->ptrace || (handler == HANDLER_EXIT)))  in force_sig_info_to_task()
1364 		t->signal->flags &= ~SIGNAL_UNKILLABLE;  in force_sig_info_to_task()
1365 	ret = send_signal_locked(sig, info, t, PIDTYPE_PID);  in force_sig_info_to_task()
1366 	spin_unlock_irqrestore(&t->sighand->siglock, flags);  in force_sig_info_to_task()
1381 	struct task_struct *t = p;  in zap_other_threads()  local
1386 	while_each_thread(p, t) {  in zap_other_threads()
1387 		task_clear_jobctl_pending(t, JOBCTL_PENDING_MASK);  in zap_other_threads()
1389 		if ((t->flags & (PF_IO_WORKER | PF_USER_WORKER)) != PF_USER_WORKER)  in zap_other_threads()
1393 		if (t->exit_state)  in zap_other_threads()
1395 		sigaddset(&t->pending.signal, SIGKILL);  in zap_other_threads()
1396 		signal_wake_up(t, 1);  in zap_other_threads()
1724 	, struct task_struct *t)  in force_sig_fault_to_task()  argument
1738 	return force_sig_info_to_task(&info, t, HANDLER_CURRENT);  in force_sig_fault_to_task()
1750 	, struct task_struct *t)  in send_sig_fault()  argument
1764 	return send_sig_info(info.si_signo, &info, t);  in send_sig_fault()
1781 int send_sig_mceerr(int code, void __user *addr, short lsb, struct task_struct *t)  in send_sig_mceerr()  argument
1792 	return send_sig_info(info.si_signo, &info, t);  in send_sig_mceerr()
1909 			  struct task_struct *t)  in send_sig_fault_trapno()  argument
1919 	return send_sig_info(info.si_signo, &info, t);  in send_sig_fault_trapno()
1983 	struct task_struct *t;  in send_sigqueue()  local
2003 	t = pid_task(pid, type);  in send_sigqueue()
2004 	if (!t)  in send_sigqueue()
2007 	    same_thread_group(t, current) && !current->exit_state)  in send_sigqueue()
2008 		t = current;  in send_sigqueue()
2009 	if (!likely(lock_task_sighand(t, &flags)))  in send_sigqueue()
2014 	if (!prepare_signal(sig, t, false))  in send_sigqueue()
2030 	signalfd_notify(t, sig);  in send_sigqueue()
2031 	pending = (type != PIDTYPE_PID) ? &t->signal->shared_pending : &t->pending;  in send_sigqueue()
2034 	complete_signal(sig, t, type);  in send_sigqueue()
2037 	trace_signal_generate(sig, &q->info, t, type != PIDTYPE_PID, result);  in send_sigqueue()
2038 	unlock_task_sighand(t, &flags);  in send_sigqueue()
2426 		struct task_struct *t;  in do_signal_stop()  local
2462 		t = current;  in do_signal_stop()
2463 		while_each_thread(current, t) {  in do_signal_stop()
2469 			if (!task_is_stopped(t) &&  in do_signal_stop()
2470 			    task_set_jobctl_pending(t, signr | gstop)) {  in do_signal_stop()
2472 				if (likely(!(t->ptrace & PT_SEIZED)))  in do_signal_stop()
2473 					signal_wake_up(t, 0);  in do_signal_stop()
2475 					ptrace_trap_notify(t);  in do_signal_stop()
2961 	struct task_struct *t;  in retarget_shared_pending()  local
2967 	t = tsk;  in retarget_shared_pending()
2968 	while_each_thread(tsk, t) {  in retarget_shared_pending()
2969 		if (t->flags & PF_EXITING)  in retarget_shared_pending()
2972 		if (!has_pending_signals(&retarget, &t->blocked))  in retarget_shared_pending()
2975 		sigandsets(&retarget, &retarget, &t->blocked);  in retarget_shared_pending()
2977 		if (!task_sigpending(t))  in retarget_shared_pending()
2978 			signal_wake_up(t, 0);  in retarget_shared_pending()
3744 	struct timespec64 t;  in COMPAT_SYSCALL_DEFINE4()  local
3755 		if (get_timespec64(&t, uts))  in COMPAT_SYSCALL_DEFINE4()
3759 	ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);  in COMPAT_SYSCALL_DEFINE4()
3775 	struct timespec64 t;  in COMPAT_SYSCALL_DEFINE4()  local
3786 		if (get_old_timespec32(&t, uts))  in COMPAT_SYSCALL_DEFINE4()
3790 	ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);  in COMPAT_SYSCALL_DEFINE4()
4135 	struct task_struct *p = current, *t;  in do_sigaction()  local
4189 			for_each_thread(p, t)  in do_sigaction()
4190 				flush_sigqueue_mask(&mask, &t->pending);  in do_sigaction()
4219 	struct task_struct *t = current;  in do_sigaltstack()  local
4224 		oss->ss_sp = (void __user *) t->sas_ss_sp;  in do_sigaltstack()
4225 		oss->ss_size = t->sas_ss_size;  in do_sigaltstack()
4248 		if (t->sas_ss_sp == (unsigned long)ss_sp &&  in do_sigaltstack()
4249 		    t->sas_ss_size == ss_size &&  in do_sigaltstack()
4250 		    t->sas_ss_flags == ss_flags)  in do_sigaltstack()
4264 			t->sas_ss_sp = (unsigned long) ss_sp;  in do_sigaltstack()
4265 			t->sas_ss_size = ss_size;  in do_sigaltstack()
4266 			t->sas_ss_flags = ss_flags;  in do_sigaltstack()
4300 	struct task_struct *t = current;  in __save_altstack()  local
4301 	int err = __put_user((void __user *)t->sas_ss_sp, &uss->ss_sp) |  in __save_altstack()
4302 		__put_user(t->sas_ss_flags, &uss->ss_flags) |  in __save_altstack()
4303 		__put_user(t->sas_ss_size, &uss->ss_size);  in __save_altstack()
4354 	struct task_struct *t = current;  in __compat_save_altstack()  local
4355 	err = __put_user(ptr_to_compat((void __user *)t->sas_ss_sp),  in __compat_save_altstack()
4357 		__put_user(t->sas_ss_flags, &uss->ss_flags) |  in __compat_save_altstack()
4358 		__put_user(t->sas_ss_size, &uss->ss_size);  in __compat_save_altstack()
4839 void kdb_send_sig(struct task_struct *t, int sig)  in kdb_send_sig()  argument
4843 	if (!spin_trylock(&t->sighand->siglock)) {  in kdb_send_sig()
4849 	new_t = kdb_prev_t != t;  in kdb_send_sig()
4850 	kdb_prev_t = t;  in kdb_send_sig()
4851 	if (!task_is_running(t) && new_t) {  in kdb_send_sig()
4852 		spin_unlock(&t->sighand->siglock);  in kdb_send_sig()
4861 	ret = send_signal_locked(sig, SEND_SIG_PRIV, t, PIDTYPE_PID);  in kdb_send_sig()
4862 	spin_unlock(&t->sighand->siglock);  in kdb_send_sig()
4865 			   sig, t->pid);  in kdb_send_sig()
4867 		kdb_printf("Signal %d is sent to process %d.\n", sig, t->pid);  in kdb_send_sig()