166 static int get_task_root(struct task_struct *task, struct path *root)  in get_task_root()  argument
170 	task_lock(task);  in get_task_root()
171 	if (task->fs) {  in get_task_root()
172 		get_fs_root(task->fs, root);  in get_task_root()
175 	task_unlock(task);  in get_task_root()
181 	struct task_struct *task = get_proc_task(d_inode(dentry));  in proc_cwd_link()  local
184 	if (task) {  in proc_cwd_link()
185 		task_lock(task);  in proc_cwd_link()
186 		if (task->fs) {  in proc_cwd_link()
187 			get_fs_pwd(task->fs, path);  in proc_cwd_link()
190 		task_unlock(task);  in proc_cwd_link()
191 		put_task_struct(task);  in proc_cwd_link()
198 	struct task_struct *task = get_proc_task(d_inode(dentry));  in proc_root_link()  local
201 	if (task) {  in proc_root_link()
202 		result = get_task_root(task, path);  in proc_root_link()
203 		put_task_struct(task);  in proc_root_link()
362 			  struct pid *pid, struct task_struct *task)  in proc_pid_wchan()  argument
367 	if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS))  in proc_pid_wchan()
370 	wchan = get_wchan(task);  in proc_pid_wchan()
382 static int lock_trace(struct task_struct *task)  in lock_trace()  argument
384 	int err = mutex_lock_killable(&task->signal->cred_guard_mutex);  in lock_trace()
387 	if (!ptrace_may_access(task, PTRACE_MODE_ATTACH_FSCREDS)) {  in lock_trace()
388 		mutex_unlock(&task->signal->cred_guard_mutex);  in lock_trace()
394 static void unlock_trace(struct task_struct *task)  in unlock_trace()  argument
396 	mutex_unlock(&task->signal->cred_guard_mutex);  in unlock_trace()
404 			  struct pid *pid, struct task_struct *task)  in proc_pid_stack()  argument
434 	err = lock_trace(task);  in proc_pid_stack()
438 		save_stack_trace_tsk(task, &trace);  in proc_pid_stack()
443 		unlock_trace(task);  in proc_pid_stack()
456 			      struct pid *pid, struct task_struct *task)  in proc_pid_schedstat()  argument
462 		   (unsigned long long)task->se.sum_exec_runtime,  in proc_pid_schedstat()
463 		   (unsigned long long)task->sched_info.run_delay,  in proc_pid_schedstat()
464 		   task->sched_info.pcount);  in proc_pid_schedstat()
475 	struct task_struct *task = get_proc_task(inode);  in lstats_show_proc()  local
477 	if (!task)  in lstats_show_proc()
481 		struct latency_record *lr = &task->latency_record[i];  in lstats_show_proc()
498 	put_task_struct(task);  in lstats_show_proc()
510 	struct task_struct *task = get_proc_task(file_inode(file));  in lstats_write()  local
512 	if (!task)  in lstats_write()
514 	clear_all_latency_tracing(task);  in lstats_write()
515 	put_task_struct(task);  in lstats_write()
531 			  struct pid *pid, struct task_struct *task)  in proc_oom_score()  argument
536 	points = oom_badness(task, NULL, NULL, totalpages) *  in proc_oom_score()
569 			   struct pid *pid, struct task_struct *task)  in proc_pid_limits()  argument
576 	if (!lock_task_sighand(task, &flags))  in proc_pid_limits()
578 	memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);  in proc_pid_limits()
579 	unlock_task_sighand(task, &flags);  in proc_pid_limits()
611 			    struct pid *pid, struct task_struct *task)  in proc_pid_syscall()  argument
617 	res = lock_trace(task);  in proc_pid_syscall()
621 	if (task_current_syscall(task, &nr, args, 6, &sp, &pc))  in proc_pid_syscall()
631 	unlock_trace(task);  in proc_pid_syscall()
644 	struct task_struct *task;  in proc_fd_access_allowed()  local
650 	task = get_proc_task(inode);  in proc_fd_access_allowed()
651 	if (task) {  in proc_fd_access_allowed()
652 		allowed = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS);  in proc_fd_access_allowed()
653 		put_task_struct(task);  in proc_fd_access_allowed()
680 				 struct task_struct *task,  in has_pid_permissions()  argument
687 	return ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS);  in has_pid_permissions()
694 	struct task_struct *task;  in proc_pid_permission()  local
697 	task = get_proc_task(inode);  in proc_pid_permission()
698 	if (!task)  in proc_pid_permission()
700 	has_perms = has_pid_permissions(pid, task, HIDEPID_NO_ACCESS);  in proc_pid_permission()
701 	put_task_struct(task);  in proc_pid_permission()
730 	struct task_struct *task;  in proc_single_show()  local
733 	task = get_pid_task(pid, PIDTYPE_PID);  in proc_single_show()
734 	if (!task)  in proc_single_show()
737 	ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);  in proc_single_show()
739 	put_task_struct(task);  in proc_single_show()
758 	struct task_struct *task = get_proc_task(inode);  in proc_mem_open()  local
761 	if (task) {  in proc_mem_open()
762 		mm = mm_access(task, mode | PTRACE_MODE_FSCREDS);  in proc_mem_open()
763 		put_task_struct(task);  in proc_mem_open()
1001 	struct task_struct *task = get_proc_task(file_inode(file));  in oom_adj_read()  local
1006 	if (!task)  in oom_adj_read()
1008 	if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MAX)  in oom_adj_read()
1011 		oom_adj = (task->signal->oom_score_adj * -OOM_DISABLE) /  in oom_adj_read()
1013 	put_task_struct(task);  in oom_adj_read()
1022 	struct task_struct *task;  in __set_oom_adj()  local
1025 	task = get_proc_task(file_inode(file));  in __set_oom_adj()
1026 	if (!task)  in __set_oom_adj()
1031 		if (oom_adj < task->signal->oom_score_adj &&  in __set_oom_adj()
1041 			  current->comm, task_pid_nr(current), task_pid_nr(task),  in __set_oom_adj()
1042 			  task_pid_nr(task));  in __set_oom_adj()
1044 		if ((short)oom_adj < task->signal->oom_score_adj_min &&  in __set_oom_adj()
1056 	if (!task->vfork_done) {  in __set_oom_adj()
1057 		struct task_struct *p = find_lock_task_mm(task);  in __set_oom_adj()
1068 	task->signal->oom_score_adj = oom_adj;  in __set_oom_adj()
1070 		task->signal->oom_score_adj_min = (short)oom_adj;  in __set_oom_adj()
1071 	trace_oom_score_adj_update(task);  in __set_oom_adj()
1078 			if (same_thread_group(task, p))  in __set_oom_adj()
1090 						task_pid_nr(task), task->comm);  in __set_oom_adj()
1102 	put_task_struct(task);  in __set_oom_adj()
1163 	struct task_struct *task = get_proc_task(file_inode(file));  in oom_score_adj_read()  local
1168 	if (!task)  in oom_score_adj_read()
1170 	oom_score_adj = task->signal->oom_score_adj;  in oom_score_adj_read()
1171 	put_task_struct(task);  in oom_score_adj_read()
1217 	struct task_struct *task = get_proc_task(inode);  in proc_loginuid_read()  local
1221 	if (!task)  in proc_loginuid_read()
1225 				     audit_get_loginuid(task)));  in proc_loginuid_read()
1226 	put_task_struct(task);  in proc_loginuid_read()
1279 	struct task_struct *task = get_proc_task(inode);  in proc_sessionid_read()  local
1283 	if (!task)  in proc_sessionid_read()
1286 				audit_get_sessionid(task));  in proc_sessionid_read()
1287 	put_task_struct(task);  in proc_sessionid_read()
1301 	struct task_struct *task = get_proc_task(file_inode(file));  in proc_fault_inject_read()  local
1306 	if (!task)  in proc_fault_inject_read()
1308 	make_it_fail = task->make_it_fail;  in proc_fault_inject_read()
1309 	put_task_struct(task);  in proc_fault_inject_read()
1319 	struct task_struct *task;  in proc_fault_inject_write()  local
1337 	task = get_proc_task(file_inode(file));  in proc_fault_inject_write()
1338 	if (!task)  in proc_fault_inject_write()
1340 	task->make_it_fail = make_it_fail;  in proc_fault_inject_write()
1341 	put_task_struct(task);  in proc_fault_inject_write()
1355 	struct task_struct *task;  in proc_fail_nth_write()  local
1363 	task = get_proc_task(file_inode(file));  in proc_fail_nth_write()
1364 	if (!task)  in proc_fail_nth_write()
1366 	task->fail_nth = n;  in proc_fail_nth_write()
1367 	put_task_struct(task);  in proc_fail_nth_write()
1375 	struct task_struct *task;  in proc_fail_nth_read()  local
1379 	task = get_proc_task(file_inode(file));  in proc_fail_nth_read()
1380 	if (!task)  in proc_fail_nth_read()
1382 	len = snprintf(numbuf, sizeof(numbuf), "%u\n", task->fail_nth);  in proc_fail_nth_read()
1383 	put_task_struct(task);  in proc_fail_nth_read()
1579 	struct task_struct *task;  in proc_exe_link()  local
1582 	task = get_proc_task(d_inode(dentry));  in proc_exe_link()
1583 	if (!task)  in proc_exe_link()
1585 	exe_file = get_task_exe_file(task);  in proc_exe_link()
1586 	put_task_struct(task);  in proc_exe_link()
1673 void task_dump_owner(struct task_struct *task, umode_t mode,  in task_dump_owner()  argument
1683 	if (unlikely(task->flags & PF_KTHREAD)) {  in task_dump_owner()
1691 	cred = __task_cred(task);  in task_dump_owner()
1706 		task_lock(task);  in task_dump_owner()
1707 		mm = task->mm;  in task_dump_owner()
1725 		task_unlock(task);  in task_dump_owner()
1732 				  struct task_struct *task, umode_t mode)  in proc_pid_make_inode()  argument
1753 	ei->pid = get_task_pid(task, PIDTYPE_PID);  in proc_pid_make_inode()
1757 	task_dump_owner(task, 0, &inode->i_uid, &inode->i_gid);  in proc_pid_make_inode()
1758 	security_task_to_inode(task, inode);  in proc_pid_make_inode()
1773 	struct task_struct *task;  in pid_getattr()  local
1780 	task = pid_task(proc_pid(inode), PIDTYPE_PID);  in pid_getattr()
1781 	if (task) {  in pid_getattr()
1782 		if (!has_pid_permissions(pid, task, HIDEPID_INVISIBLE)) {  in pid_getattr()
1790 		task_dump_owner(task, inode->i_mode, &stat->uid, &stat->gid);  in pid_getattr()
1801 void pid_update_inode(struct task_struct *task, struct inode *inode)  in pid_update_inode()  argument
1803 	task_dump_owner(task, inode->i_mode, &inode->i_uid, &inode->i_gid);  in pid_update_inode()
1806 	security_task_to_inode(task, inode);  in pid_update_inode()
1817 	struct task_struct *task;  in pid_revalidate()  local
1823 	task = get_proc_task(inode);  in pid_revalidate()
1825 	if (task) {  in pid_revalidate()
1826 		pid_update_inode(task, inode);  in pid_revalidate()
1827 		put_task_struct(task);  in pid_revalidate()
1869 	instantiate_t instantiate, struct task_struct *task, const void *ptr)  in proc_fill_cache()  argument
1885 			res = instantiate(child, task, ptr);  in proc_fill_cache()
1950 	struct task_struct *task;  in map_files_d_revalidate()  local
1958 	task = get_proc_task(inode);  in map_files_d_revalidate()
1959 	if (!task)  in map_files_d_revalidate()
1962 	mm = mm_access(task, PTRACE_MODE_READ_FSCREDS);  in map_files_d_revalidate()
1975 		task_dump_owner(task, 0, &inode->i_uid, &inode->i_gid);  in map_files_d_revalidate()
1977 		security_task_to_inode(task, inode);  in map_files_d_revalidate()
1982 	put_task_struct(task);  in map_files_d_revalidate()
1997 	struct task_struct *task;  in map_files_get_link()  local
2002 	task = get_proc_task(d_inode(dentry));  in map_files_get_link()
2003 	if (!task)  in map_files_get_link()
2006 	mm = get_task_mm(task);  in map_files_get_link()
2007 	put_task_struct(task);  in map_files_get_link()
2064 			   struct task_struct *task, const void *ptr)  in proc_map_files_instantiate()  argument
2070 	inode = proc_pid_make_inode(dentry->d_sb, task, S_IFLNK |  in proc_map_files_instantiate()
2091 	struct task_struct *task;  in proc_map_files_lookup()  local
2096 	task = get_proc_task(dir);  in proc_map_files_lookup()
2097 	if (!task)  in proc_map_files_lookup()
2101 	if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS))  in proc_map_files_lookup()
2108 	mm = get_task_mm(task);  in proc_map_files_lookup()
2118 		result = proc_map_files_instantiate(dentry, task,  in proc_map_files_lookup()
2125 	put_task_struct(task);  in proc_map_files_lookup()
2140 	struct task_struct *task;  in proc_map_files_readdir()  local
2149 	task = get_proc_task(file_inode(file));  in proc_map_files_readdir()
2150 	if (!task)  in proc_map_files_readdir()
2154 	if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS))  in proc_map_files_readdir()
2161 	mm = get_task_mm(task);  in proc_map_files_readdir()
2221 				      task,  in proc_map_files_readdir()
2230 	put_task_struct(task);  in proc_map_files_readdir()
2244 	struct task_struct *task;  member
2254 	tp->task = get_pid_task(tp->pid, PIDTYPE_PID);  in timers_start()
2255 	if (!tp->task)  in timers_start()
2258 	tp->sighand = lock_task_sighand(tp->task, &tp->flags);  in timers_start()
2262 	return seq_list_start(&tp->task->signal->posix_timers, *pos);  in timers_start()
2268 	return seq_list_next(v, &tp->task->signal->posix_timers, pos);  in timers_next()
2276 		unlock_task_sighand(tp->task, &tp->flags);  in timers_stop()
2280 	if (tp->task) {  in timers_stop()
2281 		put_task_struct(tp->task);  in timers_stop()
2282 		tp->task = NULL;  in timers_stop()
2429 	struct task_struct *task, const void *ptr)  in proc_pident_instantiate()  argument
2435 	inode = proc_pid_make_inode(dentry->d_sb, task, p->mode);  in proc_pident_instantiate()
2447 	pid_update_inode(task, inode);  in proc_pident_instantiate()
2457 	struct task_struct *task = get_proc_task(dir);  in proc_pident_lookup()  local
2461 	if (!task)  in proc_pident_lookup()
2473 			res = proc_pident_instantiate(dentry, task, p);  in proc_pident_lookup()
2477 	put_task_struct(task);  in proc_pident_lookup()
2485 	struct task_struct *task = get_proc_task(file_inode(file));  in proc_pident_readdir()  local
2488 	if (!task)  in proc_pident_readdir()
2499 				proc_pident_instantiate, task, p))  in proc_pident_readdir()
2504 	put_task_struct(task);  in proc_pident_readdir()
2515 	struct task_struct *task = get_proc_task(inode);  in proc_pid_attr_read()  local
2517 	if (!task)  in proc_pid_attr_read()
2520 	length = security_getprocattr(task,  in proc_pid_attr_read()
2523 	put_task_struct(task);  in proc_pid_attr_read()
2534 	struct task_struct *task;  in proc_pid_attr_write()  local
2539 	task = pid_task(proc_pid(inode), PIDTYPE_PID);  in proc_pid_attr_write()
2540 	if (!task) {  in proc_pid_attr_write()
2545 	if (current != task) {  in proc_pid_attr_write()
2623 	struct task_struct *task = get_proc_task(file_inode(file));  in proc_coredump_filter_read()  local
2629 	if (!task)  in proc_coredump_filter_read()
2633 	mm = get_task_mm(task);  in proc_coredump_filter_read()
2642 	put_task_struct(task);  in proc_coredump_filter_read()
2652 	struct task_struct *task;  in proc_coredump_filter_write()  local
2664 	task = get_proc_task(file_inode(file));  in proc_coredump_filter_write()
2665 	if (!task)  in proc_coredump_filter_write()
2668 	mm = get_task_mm(task);  in proc_coredump_filter_write()
2682 	put_task_struct(task);  in proc_coredump_filter_write()
2697 static int do_io_accounting(struct task_struct *task, struct seq_file *m, int whole)  in do_io_accounting()  argument
2699 	struct task_io_accounting acct = task->ioac;  in do_io_accounting()
2703 	result = mutex_lock_killable(&task->signal->cred_guard_mutex);  in do_io_accounting()
2707 	if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) {  in do_io_accounting()
2712 	if (whole && lock_task_sighand(task, &flags)) {  in do_io_accounting()
2713 		struct task_struct *t = task;  in do_io_accounting()
2715 		task_io_accounting_add(&acct, &task->signal->ioac);  in do_io_accounting()
2716 		while_each_thread(task, t)  in do_io_accounting()
2719 		unlock_task_sighand(task, &flags);  in do_io_accounting()
2739 	mutex_unlock(&task->signal->cred_guard_mutex);  in do_io_accounting()
2744 				  struct pid *pid, struct task_struct *task)  in proc_tid_io_accounting()  argument
2746 	return do_io_accounting(task, m, 0);  in proc_tid_io_accounting()
2750 				   struct pid *pid, struct task_struct *task)  in proc_tgid_io_accounting()  argument
2752 	return do_io_accounting(task, m, 1);  in proc_tgid_io_accounting()
2761 	struct task_struct *task;  in proc_id_map_open()  local
2765 	task = get_proc_task(inode);  in proc_id_map_open()
2766 	if (task) {  in proc_id_map_open()
2768 		ns = get_user_ns(task_cred_xxx(task, user_ns));  in proc_id_map_open()
2770 		put_task_struct(task);  in proc_id_map_open()
2839 	struct task_struct *task;  in proc_setgroups_open()  local
2843 	task = get_proc_task(inode);  in proc_setgroups_open()
2844 	if (task) {  in proc_setgroups_open()
2846 		ns = get_user_ns(task_cred_xxx(task, user_ns));  in proc_setgroups_open()
2848 		put_task_struct(task);  in proc_setgroups_open()
2889 				struct pid *pid, struct task_struct *task)  in proc_pid_personality()  argument
2891 	int err = lock_trace(task);  in proc_pid_personality()
2893 		seq_printf(m, "%08x\n", task->personality);  in proc_pid_personality()
2894 		unlock_trace(task);  in proc_pid_personality()
2901 				struct pid *pid, struct task_struct *task)  in proc_pid_patch_state()  argument
2903 	seq_printf(m, "%d\n", task->patch_state);  in proc_pid_patch_state()
3106 void proc_flush_task(struct task_struct *task)  in proc_flush_task()  argument
3112 	pid = task_pid(task);  in proc_flush_task()
3113 	tgid = task_tgid(task);  in proc_flush_task()
3123 				   struct task_struct *task, const void *ptr)  in proc_pid_instantiate()  argument
3127 	inode = proc_pid_make_inode(dentry->d_sb, task, S_IFDIR | S_IRUGO | S_IXUGO);  in proc_pid_instantiate()
3136 	pid_update_inode(task, inode);  in proc_pid_instantiate()
3144 	struct task_struct *task;  in proc_pid_lookup()  local
3155 	task = find_task_by_pid_ns(tgid, ns);  in proc_pid_lookup()
3156 	if (task)  in proc_pid_lookup()
3157 		get_task_struct(task);  in proc_pid_lookup()
3159 	if (!task)  in proc_pid_lookup()
3162 	result = proc_pid_instantiate(dentry, task, NULL);  in proc_pid_lookup()
3163 	put_task_struct(task);  in proc_pid_lookup()
3174 	struct task_struct *task;  member
3180 	if (iter.task)  in next_tgid()
3181 		put_task_struct(iter.task);  in next_tgid()
3184 	iter.task = NULL;  in next_tgid()
3188 		iter.task = pid_task(pid, PIDTYPE_PID);  in next_tgid()
3201 		if (!iter.task || !has_group_leader_pid(iter.task)) {  in next_tgid()
3205 		get_task_struct(iter.task);  in next_tgid()
3236 	iter.task = NULL;  in proc_pid_readdir()
3238 	     iter.task;  in proc_pid_readdir()
3244 		if (!has_pid_permissions(ns, iter.task, HIDEPID_INVISIBLE))  in proc_pid_readdir()
3250 				     proc_pid_instantiate, iter.task, NULL)) {  in proc_pid_readdir()
3251 			put_task_struct(iter.task);  in proc_pid_readdir()
3274 	struct task_struct *task;  in proc_tid_comm_permission()  local
3276 	task = get_proc_task(inode);  in proc_tid_comm_permission()
3277 	if (!task)  in proc_tid_comm_permission()
3279 	is_same_tgroup = same_thread_group(current, task);  in proc_tid_comm_permission()
3280 	put_task_struct(task);  in proc_tid_comm_permission()
3414 	struct task_struct *task, const void *ptr)  in proc_task_instantiate()  argument
3417 	inode = proc_pid_make_inode(dentry->d_sb, task, S_IFDIR | S_IRUGO | S_IXUGO);  in proc_task_instantiate()
3426 	pid_update_inode(task, inode);  in proc_task_instantiate()
3434 	struct task_struct *task;  in proc_task_lookup()  local
3449 	task = find_task_by_pid_ns(tid, ns);  in proc_task_lookup()
3450 	if (task)  in proc_task_lookup()
3451 		get_task_struct(task);  in proc_task_lookup()
3453 	if (!task)  in proc_task_lookup()
3455 	if (!same_thread_group(leader, task))  in proc_task_lookup()
3458 	result = proc_task_instantiate(dentry, task, NULL);  in proc_task_lookup()
3460 	put_task_struct(task);  in proc_task_lookup()
3482 	struct task_struct *pos, *task;  in first_tid()  local
3489 	task = pid_task(pid, PIDTYPE_PID);  in first_tid()
3490 	if (!task)  in first_tid()
3496 		if (pos && same_thread_group(pos, task))  in first_tid()
3501 	if (nr >= get_nr_threads(task))  in first_tid()
3507 	pos = task = task->group_leader;  in first_tid()
3511 	} while_each_thread(task, pos);  in first_tid()
3548 	struct task_struct *task;  in proc_task_readdir()  local
3564 	for (task = first_tid(proc_pid(inode), tid, ctx->pos - 2, ns);  in proc_task_readdir()
3565 	     task;  in proc_task_readdir()
3566 	     task = next_tid(task), ctx->pos++) {  in proc_task_readdir()
3569 		tid = task_pid_nr_ns(task, ns);  in proc_task_readdir()
3572 				proc_task_instantiate, task, NULL)) {  in proc_task_readdir()
3576 			put_task_struct(task);  in proc_task_readdir()