63 void __ptrace_link(struct task_struct *child, struct task_struct *new_parent,  in __ptrace_link()  argument
66 	BUG_ON(!list_empty(&child->ptrace_entry));  in __ptrace_link()
67 	list_add(&child->ptrace_entry, &new_parent->ptraced);  in __ptrace_link()
68 	child->parent = new_parent;  in __ptrace_link()
69 	child->ptracer_cred = get_cred(ptracer_cred);  in __ptrace_link()
78 static void ptrace_link(struct task_struct *child, struct task_struct *new_parent)  in ptrace_link()  argument
81 	__ptrace_link(child, new_parent, __task_cred(new_parent));  in ptrace_link()
113 void __ptrace_unlink(struct task_struct *child)  in __ptrace_unlink()  argument
116 	BUG_ON(!child->ptrace);  in __ptrace_unlink()
118 	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);  in __ptrace_unlink()
120 	child->parent = child->real_parent;  in __ptrace_unlink()
121 	list_del_init(&child->ptrace_entry);  in __ptrace_unlink()
122 	old_cred = child->ptracer_cred;  in __ptrace_unlink()
123 	child->ptracer_cred = NULL;  in __ptrace_unlink()
126 	spin_lock(&child->sighand->siglock);  in __ptrace_unlink()
127 	child->ptrace = 0;  in __ptrace_unlink()
132 	task_clear_jobctl_pending(child, JOBCTL_TRAP_MASK);  in __ptrace_unlink()
133 	task_clear_jobctl_trapping(child);  in __ptrace_unlink()
139 	if (!(child->flags & PF_EXITING) &&  in __ptrace_unlink()
140 	    (child->signal->flags & SIGNAL_STOP_STOPPED ||  in __ptrace_unlink()
141 	     child->signal->group_stop_count)) {  in __ptrace_unlink()
142 		child->jobctl |= JOBCTL_STOP_PENDING;  in __ptrace_unlink()
151 		if (!(child->jobctl & JOBCTL_STOP_SIGMASK))  in __ptrace_unlink()
152 			child->jobctl |= SIGSTOP;  in __ptrace_unlink()
161 	if (child->jobctl & JOBCTL_STOP_PENDING || task_is_traced(child))  in __ptrace_unlink()
162 		ptrace_signal_wake_up(child, true);  in __ptrace_unlink()
164 	spin_unlock(&child->sighand->siglock);  in __ptrace_unlink()
224 static int ptrace_check_attach(struct task_struct *child, bool ignore_state)  in ptrace_check_attach()  argument
236 	if (child->ptrace && child->parent == current) {  in ptrace_check_attach()
237 		WARN_ON(child->state == __TASK_TRACED);  in ptrace_check_attach()
242 		if (ignore_state || ptrace_freeze_traced(child))  in ptrace_check_attach()
248 		if (!wait_task_inactive(child, __TASK_TRACED)) {  in ptrace_check_attach()
254 			WARN_ON(child->state == __TASK_TRACED);  in ptrace_check_attach()
529 static int ptrace_detach(struct task_struct *child, unsigned int data)  in ptrace_detach()  argument
535 	ptrace_disable(child);  in ptrace_detach()
542 	WARN_ON(!child->ptrace || child->exit_state);  in ptrace_detach()
547 	child->exit_code = data;  in ptrace_detach()
548 	__ptrace_detach(current, child);  in ptrace_detach()
551 	proc_ptrace_connector(child, PTRACE_DETACH);  in ptrace_detach()
625 static int ptrace_setoptions(struct task_struct *child, unsigned long data)  in ptrace_setoptions()  argument
646 	flags = child->ptrace;  in ptrace_setoptions()
649 	child->ptrace = flags;  in ptrace_setoptions()
654 static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info)  in ptrace_getsiginfo()  argument
659 	if (lock_task_sighand(child, &flags)) {  in ptrace_getsiginfo()
661 		if (likely(child->last_siginfo != NULL)) {  in ptrace_getsiginfo()
662 			copy_siginfo(info, child->last_siginfo);  in ptrace_getsiginfo()
665 		unlock_task_sighand(child, &flags);  in ptrace_getsiginfo()
670 static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info)  in ptrace_setsiginfo()  argument
675 	if (lock_task_sighand(child, &flags)) {  in ptrace_setsiginfo()
677 		if (likely(child->last_siginfo != NULL)) {  in ptrace_setsiginfo()
678 			copy_siginfo(child->last_siginfo, info);  in ptrace_setsiginfo()
681 		unlock_task_sighand(child, &flags);  in ptrace_setsiginfo()
686 static int ptrace_peek_siginfo(struct task_struct *child,  in ptrace_peek_siginfo()  argument
707 		pending = &child->signal->shared_pending;  in ptrace_peek_siginfo()
709 		pending = &child->pending;  in ptrace_peek_siginfo()
715 		spin_lock_irq(&child->sighand->siglock);  in ptrace_peek_siginfo()
722 		spin_unlock_irq(&child->sighand->siglock);  in ptrace_peek_siginfo()
780 static int ptrace_resume(struct task_struct *child, long request,  in ptrace_resume()  argument
789 		set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);  in ptrace_resume()
791 		clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);  in ptrace_resume()
795 		set_tsk_thread_flag(child, TIF_SYSCALL_EMU);  in ptrace_resume()
797 		clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);  in ptrace_resume()
803 		user_enable_block_step(child);  in ptrace_resume()
807 		user_enable_single_step(child);  in ptrace_resume()
809 		user_disable_single_step(child);  in ptrace_resume()
827 		spin_lock_irq(&child->sighand->siglock);  in ptrace_resume()
828 	child->exit_code = data;  in ptrace_resume()
829 	wake_up_state(child, __TASK_TRACED);  in ptrace_resume()
831 		spin_unlock_irq(&child->sighand->siglock);  in ptrace_resume()
883 int ptrace_request(struct task_struct *child, long request,  in ptrace_request()  argument
886 	bool seized = child->ptrace & PT_SEIZED;  in ptrace_request()
896 		return generic_ptrace_peekdata(child, addr, data);  in ptrace_request()
899 		return generic_ptrace_pokedata(child, addr, data);  in ptrace_request()
905 		ret = ptrace_setoptions(child, data);  in ptrace_request()
908 		ret = put_user(child->ptrace_message, datalp);  in ptrace_request()
912 		ret = ptrace_peek_siginfo(child, addr, data);  in ptrace_request()
916 		ret = ptrace_getsiginfo(child, &siginfo);  in ptrace_request()
925 			ret = ptrace_setsiginfo(child, &siginfo);  in ptrace_request()
934 		if (copy_to_user(datavp, &child->blocked, sizeof(sigset_t)))  in ptrace_request()
961 		spin_lock_irq(&child->sighand->siglock);  in ptrace_request()
962 		child->blocked = new_set;  in ptrace_request()
963 		spin_unlock_irq(&child->sighand->siglock);  in ptrace_request()
980 		if (unlikely(!seized || !lock_task_sighand(child, &flags)))  in ptrace_request()
989 		if (likely(task_set_jobctl_pending(child, JOBCTL_TRAP_STOP)))  in ptrace_request()
990 			ptrace_signal_wake_up(child, child->jobctl & JOBCTL_LISTENING);  in ptrace_request()
992 		unlock_task_sighand(child, &flags);  in ptrace_request()
1005 		if (unlikely(!seized || !lock_task_sighand(child, &flags)))  in ptrace_request()
1008 		si = child->last_siginfo;  in ptrace_request()
1010 			child->jobctl |= JOBCTL_LISTENING;  in ptrace_request()
1015 			if (child->jobctl & JOBCTL_TRAP_NOTIFY)  in ptrace_request()
1016 				ptrace_signal_wake_up(child, true);  in ptrace_request()
1019 		unlock_task_sighand(child, &flags);  in ptrace_request()
1023 		ret = ptrace_detach(child, data);  in ptrace_request()
1028 		struct mm_struct *mm = get_task_mm(child);  in ptrace_request()
1064 		return ptrace_resume(child, request, data);  in ptrace_request()
1067 		if (child->exit_state)	/* already dead */  in ptrace_request()
1069 		return ptrace_resume(child, request, SIGKILL);  in ptrace_request()
1084 		ret = ptrace_regset(child, request, addr, &kiov);  in ptrace_request()
1092 		ret = seccomp_get_filter(child, addr, datavp);  in ptrace_request()
1096 		ret = seccomp_get_metadata(child, addr, datavp);  in ptrace_request()
1107 #define arch_ptrace_attach(child)	do { } while (0)  argument
1113 	struct task_struct *child;  in SYSCALL_DEFINE4()  local
1123 	child = find_get_task_by_vpid(pid);  in SYSCALL_DEFINE4()
1124 	if (!child) {  in SYSCALL_DEFINE4()
1130 		ret = ptrace_attach(child, request, addr, data);  in SYSCALL_DEFINE4()
1136 			arch_ptrace_attach(child);  in SYSCALL_DEFINE4()
1140 	ret = ptrace_check_attach(child, request == PTRACE_KILL ||  in SYSCALL_DEFINE4()
1145 	ret = arch_ptrace(child, request, addr, data);  in SYSCALL_DEFINE4()
1147 		ptrace_unfreeze_traced(child);  in SYSCALL_DEFINE4()
1150 	put_task_struct(child);  in SYSCALL_DEFINE4()
1179 int compat_ptrace_request(struct task_struct *child, compat_long_t request,  in compat_ptrace_request()  argument
1190 		ret = ptrace_access_vm(child, addr, &word, sizeof(word),  in compat_ptrace_request()
1200 		ret = ptrace_access_vm(child, addr, &data, sizeof(data),  in compat_ptrace_request()
1206 		ret = put_user((compat_ulong_t) child->ptrace_message, datap);  in compat_ptrace_request()
1210 		ret = ptrace_getsiginfo(child, &siginfo);  in compat_ptrace_request()
1222 			ret = ptrace_setsiginfo(child, &siginfo);  in compat_ptrace_request()
1244 		ret = ptrace_regset(child, request, addr, &kiov);  in compat_ptrace_request()
1252 		ret = ptrace_request(child, request, addr, data);  in compat_ptrace_request()
1261 	struct task_struct *child;  in COMPAT_SYSCALL_DEFINE4()  local
1269 	child = find_get_task_by_vpid(pid);  in COMPAT_SYSCALL_DEFINE4()
1270 	if (!child) {  in COMPAT_SYSCALL_DEFINE4()
1276 		ret = ptrace_attach(child, request, addr, data);  in COMPAT_SYSCALL_DEFINE4()
1282 			arch_ptrace_attach(child);  in COMPAT_SYSCALL_DEFINE4()
1286 	ret = ptrace_check_attach(child, request == PTRACE_KILL ||  in COMPAT_SYSCALL_DEFINE4()
1289 		ret = compat_arch_ptrace(child, request, addr, data);  in COMPAT_SYSCALL_DEFINE4()
1291 			ptrace_unfreeze_traced(child);  in COMPAT_SYSCALL_DEFINE4()
1295 	put_task_struct(child);  in COMPAT_SYSCALL_DEFINE4()