37 void __ptrace_link(struct task_struct *child, struct task_struct *new_parent)  in __ptrace_link()  argument
39 	BUG_ON(!list_empty(&child->ptrace_entry));  in __ptrace_link()
40 	list_add(&child->ptrace_entry, &new_parent->ptraced);  in __ptrace_link()
41 	child->parent = new_parent;  in __ptrace_link()
72 void __ptrace_unlink(struct task_struct *child)  in __ptrace_unlink()  argument
74 	BUG_ON(!child->ptrace);  in __ptrace_unlink()
76 	child->ptrace = 0;  in __ptrace_unlink()
77 	child->parent = child->real_parent;  in __ptrace_unlink()
78 	list_del_init(&child->ptrace_entry);  in __ptrace_unlink()
80 	spin_lock(&child->sighand->siglock);  in __ptrace_unlink()
86 	task_clear_jobctl_pending(child, JOBCTL_TRAP_MASK);  in __ptrace_unlink()
87 	task_clear_jobctl_trapping(child);  in __ptrace_unlink()
93 	if (!(child->flags & PF_EXITING) &&  in __ptrace_unlink()
94 	    (child->signal->flags & SIGNAL_STOP_STOPPED ||  in __ptrace_unlink()
95 	     child->signal->group_stop_count)) {  in __ptrace_unlink()
96 		child->jobctl |= JOBCTL_STOP_PENDING;  in __ptrace_unlink()
105 		if (!(child->jobctl & JOBCTL_STOP_SIGMASK))  in __ptrace_unlink()
106 			child->jobctl |= SIGSTOP;  in __ptrace_unlink()
115 	if (child->jobctl & JOBCTL_STOP_PENDING || task_is_traced(child))  in __ptrace_unlink()
116 		ptrace_signal_wake_up(child, true);  in __ptrace_unlink()
118 	spin_unlock(&child->sighand->siglock);  in __ptrace_unlink()
172 static int ptrace_check_attach(struct task_struct *child, bool ignore_state)  in ptrace_check_attach()  argument
184 	if (child->ptrace && child->parent == current) {  in ptrace_check_attach()
185 		WARN_ON(child->state == __TASK_TRACED);  in ptrace_check_attach()
190 		if (ignore_state || ptrace_freeze_traced(child))  in ptrace_check_attach()
196 		if (!wait_task_inactive(child, __TASK_TRACED)) {  in ptrace_check_attach()
202 			WARN_ON(child->state == __TASK_TRACED);  in ptrace_check_attach()
480 static int ptrace_detach(struct task_struct *child, unsigned int data)  in ptrace_detach()  argument
486 	ptrace_disable(child);  in ptrace_detach()
487 	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);  in ptrace_detach()
494 	WARN_ON(!child->ptrace || child->exit_state);  in ptrace_detach()
499 	child->exit_code = data;  in ptrace_detach()
500 	__ptrace_detach(current, child);  in ptrace_detach()
503 	proc_ptrace_connector(child, PTRACE_DETACH);  in ptrace_detach()
575 static int ptrace_setoptions(struct task_struct *child, unsigned long data)  in ptrace_setoptions()  argument
583 	flags = child->ptrace;  in ptrace_setoptions()
586 	child->ptrace = flags;  in ptrace_setoptions()
591 static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info)  in ptrace_getsiginfo()  argument
596 	if (lock_task_sighand(child, &flags)) {  in ptrace_getsiginfo()
598 		if (likely(child->last_siginfo != NULL)) {  in ptrace_getsiginfo()
599 			*info = *child->last_siginfo;  in ptrace_getsiginfo()
602 		unlock_task_sighand(child, &flags);  in ptrace_getsiginfo()
607 static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info)  in ptrace_setsiginfo()  argument
612 	if (lock_task_sighand(child, &flags)) {  in ptrace_setsiginfo()
614 		if (likely(child->last_siginfo != NULL)) {  in ptrace_setsiginfo()
615 			*child->last_siginfo = *info;  in ptrace_setsiginfo()
618 		unlock_task_sighand(child, &flags);  in ptrace_setsiginfo()
623 static int ptrace_peek_siginfo(struct task_struct *child,  in ptrace_peek_siginfo()  argument
644 		pending = &child->signal->shared_pending;  in ptrace_peek_siginfo()
646 		pending = &child->pending;  in ptrace_peek_siginfo()
652 		spin_lock_irq(&child->sighand->siglock);  in ptrace_peek_siginfo()
659 		spin_unlock_irq(&child->sighand->siglock);  in ptrace_peek_siginfo()
719 static int ptrace_resume(struct task_struct *child, long request,  in ptrace_resume()  argument
728 		set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);  in ptrace_resume()
730 		clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);  in ptrace_resume()
734 		set_tsk_thread_flag(child, TIF_SYSCALL_EMU);  in ptrace_resume()
736 		clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);  in ptrace_resume()
742 		user_enable_block_step(child);  in ptrace_resume()
746 		user_enable_single_step(child);  in ptrace_resume()
748 		user_disable_single_step(child);  in ptrace_resume()
766 		spin_lock_irq(&child->sighand->siglock);  in ptrace_resume()
767 	child->exit_code = data;  in ptrace_resume()
768 	wake_up_state(child, __TASK_TRACED);  in ptrace_resume()
770 		spin_unlock_irq(&child->sighand->siglock);  in ptrace_resume()
822 int ptrace_request(struct task_struct *child, long request,  in ptrace_request()  argument
825 	bool seized = child->ptrace & PT_SEIZED;  in ptrace_request()
835 		return generic_ptrace_peekdata(child, addr, data);  in ptrace_request()
838 		return generic_ptrace_pokedata(child, addr, data);  in ptrace_request()
844 		ret = ptrace_setoptions(child, data);  in ptrace_request()
847 		ret = put_user(child->ptrace_message, datalp);  in ptrace_request()
851 		ret = ptrace_peek_siginfo(child, addr, data);  in ptrace_request()
855 		ret = ptrace_getsiginfo(child, &siginfo);  in ptrace_request()
864 			ret = ptrace_setsiginfo(child, &siginfo);  in ptrace_request()
873 		if (copy_to_user(datavp, &child->blocked, sizeof(sigset_t)))  in ptrace_request()
900 		spin_lock_irq(&child->sighand->siglock);  in ptrace_request()
901 		child->blocked = new_set;  in ptrace_request()
902 		spin_unlock_irq(&child->sighand->siglock);  in ptrace_request()
919 		if (unlikely(!seized || !lock_task_sighand(child, &flags)))  in ptrace_request()
928 		if (likely(task_set_jobctl_pending(child, JOBCTL_TRAP_STOP)))  in ptrace_request()
929 			ptrace_signal_wake_up(child, child->jobctl & JOBCTL_LISTENING);  in ptrace_request()
931 		unlock_task_sighand(child, &flags);  in ptrace_request()
944 		if (unlikely(!seized || !lock_task_sighand(child, &flags)))  in ptrace_request()
947 		si = child->last_siginfo;  in ptrace_request()
949 			child->jobctl |= JOBCTL_LISTENING;  in ptrace_request()
954 			if (child->jobctl & JOBCTL_TRAP_NOTIFY)  in ptrace_request()
955 				ptrace_signal_wake_up(child, true);  in ptrace_request()
958 		unlock_task_sighand(child, &flags);  in ptrace_request()
962 		ret = ptrace_detach(child, data);  in ptrace_request()
967 		struct mm_struct *mm = get_task_mm(child);  in ptrace_request()
1003 		return ptrace_resume(child, request, data);  in ptrace_request()
1006 		if (child->exit_state)	/* already dead */  in ptrace_request()
1008 		return ptrace_resume(child, request, SIGKILL);  in ptrace_request()
1023 		ret = ptrace_regset(child, request, addr, &kiov);  in ptrace_request()
1038 	struct task_struct *child;  in ptrace_get_task_struct()  local
1041 	child = find_task_by_vpid(pid);  in ptrace_get_task_struct()
1042 	if (child)  in ptrace_get_task_struct()
1043 		get_task_struct(child);  in ptrace_get_task_struct()
1046 	if (!child)  in ptrace_get_task_struct()
1048 	return child;  in ptrace_get_task_struct()
1052 #define arch_ptrace_attach(child)	do { } while (0)  argument
1058 	struct task_struct *child;  in SYSCALL_DEFINE4()  local
1068 	child = ptrace_get_task_struct(pid);  in SYSCALL_DEFINE4()
1069 	if (IS_ERR(child)) {  in SYSCALL_DEFINE4()
1070 		ret = PTR_ERR(child);  in SYSCALL_DEFINE4()
1075 		ret = ptrace_attach(child, request, addr, data);  in SYSCALL_DEFINE4()
1081 			arch_ptrace_attach(child);  in SYSCALL_DEFINE4()
1085 	ret = ptrace_check_attach(child, request == PTRACE_KILL ||  in SYSCALL_DEFINE4()
1090 	ret = arch_ptrace(child, request, addr, data);  in SYSCALL_DEFINE4()
1092 		ptrace_unfreeze_traced(child);  in SYSCALL_DEFINE4()
1095 	put_task_struct(child);  in SYSCALL_DEFINE4()
1123 int compat_ptrace_request(struct task_struct *child, compat_long_t request,  in compat_ptrace_request()  argument
1134 		ret = access_process_vm(child, addr, &word, sizeof(word), 0);  in compat_ptrace_request()
1143 		ret = access_process_vm(child, addr, &data, sizeof(data), 1);  in compat_ptrace_request()
1148 		ret = put_user((compat_ulong_t) child->ptrace_message, datap);  in compat_ptrace_request()
1152 		ret = ptrace_getsiginfo(child, &siginfo);  in compat_ptrace_request()
1165 			ret = ptrace_setsiginfo(child, &siginfo);  in compat_ptrace_request()
1187 		ret = ptrace_regset(child, request, addr, &kiov);  in compat_ptrace_request()
1195 		ret = ptrace_request(child, request, addr, data);  in compat_ptrace_request()
1204 	struct task_struct *child;  in COMPAT_SYSCALL_DEFINE4()  local
1212 	child = ptrace_get_task_struct(pid);  in COMPAT_SYSCALL_DEFINE4()
1213 	if (IS_ERR(child)) {  in COMPAT_SYSCALL_DEFINE4()
1214 		ret = PTR_ERR(child);  in COMPAT_SYSCALL_DEFINE4()
1219 		ret = ptrace_attach(child, request, addr, data);  in COMPAT_SYSCALL_DEFINE4()
1225 			arch_ptrace_attach(child);  in COMPAT_SYSCALL_DEFINE4()
1229 	ret = ptrace_check_attach(child, request == PTRACE_KILL ||  in COMPAT_SYSCALL_DEFINE4()
1232 		ret = compat_arch_ptrace(child, request, addr, data);  in COMPAT_SYSCALL_DEFINE4()
1234 			ptrace_unfreeze_traced(child);  in COMPAT_SYSCALL_DEFINE4()
1238 	put_task_struct(child);  in COMPAT_SYSCALL_DEFINE4()