Initial import

1 files changed, 2789 insertions, 0 deletions

diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
new file mode 100644
index 000000000..e0fb75052
--- /dev/null
+++ b/security/tomoyo/common.c
@@ -0,0 +1,2789 @@
+/*
+ * security/tomoyo/common.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+#include <linux/security.h>
+#include "common.h"
+
+/* String table for operation mode. */
+const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
+	[TOMOYO_CONFIG_DISABLED]   = "disabled",
+	[TOMOYO_CONFIG_LEARNING]   = "learning",
+	[TOMOYO_CONFIG_PERMISSIVE] = "permissive",
+	[TOMOYO_CONFIG_ENFORCING]  = "enforcing"
+};
+
+/* String table for /sys/kernel/security/tomoyo/profile */
+const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
+				       + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
+	/* CONFIG::file group */
+	[TOMOYO_MAC_FILE_EXECUTE]    = "execute",
+	[TOMOYO_MAC_FILE_OPEN]       = "open",
+	[TOMOYO_MAC_FILE_CREATE]     = "create",
+	[TOMOYO_MAC_FILE_UNLINK]     = "unlink",
+	[TOMOYO_MAC_FILE_GETATTR]    = "getattr",
+	[TOMOYO_MAC_FILE_MKDIR]      = "mkdir",
+	[TOMOYO_MAC_FILE_RMDIR]      = "rmdir",
+	[TOMOYO_MAC_FILE_MKFIFO]     = "mkfifo",
+	[TOMOYO_MAC_FILE_MKSOCK]     = "mksock",
+	[TOMOYO_MAC_FILE_TRUNCATE]   = "truncate",
+	[TOMOYO_MAC_FILE_SYMLINK]    = "symlink",
+	[TOMOYO_MAC_FILE_MKBLOCK]    = "mkblock",
+	[TOMOYO_MAC_FILE_MKCHAR]     = "mkchar",
+	[TOMOYO_MAC_FILE_LINK]       = "link",
+	[TOMOYO_MAC_FILE_RENAME]     = "rename",
+	[TOMOYO_MAC_FILE_CHMOD]      = "chmod",
+	[TOMOYO_MAC_FILE_CHOWN]      = "chown",
+	[TOMOYO_MAC_FILE_CHGRP]      = "chgrp",
+	[TOMOYO_MAC_FILE_IOCTL]      = "ioctl",
+	[TOMOYO_MAC_FILE_CHROOT]     = "chroot",
+	[TOMOYO_MAC_FILE_MOUNT]      = "mount",
+	[TOMOYO_MAC_FILE_UMOUNT]     = "unmount",
+	[TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root",
+	/* CONFIG::network group */
+	[TOMOYO_MAC_NETWORK_INET_STREAM_BIND]       = "inet_stream_bind",
+	[TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN]     = "inet_stream_listen",
+	[TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT]    = "inet_stream_connect",
+	[TOMOYO_MAC_NETWORK_INET_DGRAM_BIND]        = "inet_dgram_bind",
+	[TOMOYO_MAC_NETWORK_INET_DGRAM_SEND]        = "inet_dgram_send",
+	[TOMOYO_MAC_NETWORK_INET_RAW_BIND]          = "inet_raw_bind",
+	[TOMOYO_MAC_NETWORK_INET_RAW_SEND]          = "inet_raw_send",
+	[TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND]       = "unix_stream_bind",
+	[TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN]     = "unix_stream_listen",
+	[TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT]    = "unix_stream_connect",
+	[TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND]        = "unix_dgram_bind",
+	[TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND]        = "unix_dgram_send",
+	[TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND]    = "unix_seqpacket_bind",
+	[TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN]  = "unix_seqpacket_listen",
+	[TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect",
+	/* CONFIG::misc group */
+	[TOMOYO_MAC_ENVIRON] = "env",
+	/* CONFIG group */
+	[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
+	[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_NETWORK] = "network",
+	[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_MISC] = "misc",
+};
+
+/* String table for conditions. */
+const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
+	[TOMOYO_TASK_UID]             = "task.uid",
+	[TOMOYO_TASK_EUID]            = "task.euid",
+	[TOMOYO_TASK_SUID]            = "task.suid",
+	[TOMOYO_TASK_FSUID]           = "task.fsuid",
+	[TOMOYO_TASK_GID]             = "task.gid",
+	[TOMOYO_TASK_EGID]            = "task.egid",
+	[TOMOYO_TASK_SGID]            = "task.sgid",
+	[TOMOYO_TASK_FSGID]           = "task.fsgid",
+	[TOMOYO_TASK_PID]             = "task.pid",
+	[TOMOYO_TASK_PPID]            = "task.ppid",
+	[TOMOYO_EXEC_ARGC]            = "exec.argc",
+	[TOMOYO_EXEC_ENVC]            = "exec.envc",
+	[TOMOYO_TYPE_IS_SOCKET]       = "socket",
+	[TOMOYO_TYPE_IS_SYMLINK]      = "symlink",
+	[TOMOYO_TYPE_IS_FILE]         = "file",
+	[TOMOYO_TYPE_IS_BLOCK_DEV]    = "block",
+	[TOMOYO_TYPE_IS_DIRECTORY]    = "directory",
+	[TOMOYO_TYPE_IS_CHAR_DEV]     = "char",
+	[TOMOYO_TYPE_IS_FIFO]         = "fifo",
+	[TOMOYO_MODE_SETUID]          = "setuid",
+	[TOMOYO_MODE_SETGID]          = "setgid",
+	[TOMOYO_MODE_STICKY]          = "sticky",
+	[TOMOYO_MODE_OWNER_READ]      = "owner_read",
+	[TOMOYO_MODE_OWNER_WRITE]     = "owner_write",
+	[TOMOYO_MODE_OWNER_EXECUTE]   = "owner_execute",
+	[TOMOYO_MODE_GROUP_READ]      = "group_read",
+	[TOMOYO_MODE_GROUP_WRITE]     = "group_write",
+	[TOMOYO_MODE_GROUP_EXECUTE]   = "group_execute",
+	[TOMOYO_MODE_OTHERS_READ]     = "others_read",
+	[TOMOYO_MODE_OTHERS_WRITE]    = "others_write",
+	[TOMOYO_MODE_OTHERS_EXECUTE]  = "others_execute",
+	[TOMOYO_EXEC_REALPATH]        = "exec.realpath",
+	[TOMOYO_SYMLINK_TARGET]       = "symlink.target",
+	[TOMOYO_PATH1_UID]            = "path1.uid",
+	[TOMOYO_PATH1_GID]            = "path1.gid",
+	[TOMOYO_PATH1_INO]            = "path1.ino",
+	[TOMOYO_PATH1_MAJOR]          = "path1.major",
+	[TOMOYO_PATH1_MINOR]          = "path1.minor",
+	[TOMOYO_PATH1_PERM]           = "path1.perm",
+	[TOMOYO_PATH1_TYPE]           = "path1.type",
+	[TOMOYO_PATH1_DEV_MAJOR]      = "path1.dev_major",
+	[TOMOYO_PATH1_DEV_MINOR]      = "path1.dev_minor",
+	[TOMOYO_PATH2_UID]            = "path2.uid",
+	[TOMOYO_PATH2_GID]            = "path2.gid",
+	[TOMOYO_PATH2_INO]            = "path2.ino",
+	[TOMOYO_PATH2_MAJOR]          = "path2.major",
+	[TOMOYO_PATH2_MINOR]          = "path2.minor",
+	[TOMOYO_PATH2_PERM]           = "path2.perm",
+	[TOMOYO_PATH2_TYPE]           = "path2.type",
+	[TOMOYO_PATH2_DEV_MAJOR]      = "path2.dev_major",
+	[TOMOYO_PATH2_DEV_MINOR]      = "path2.dev_minor",
+	[TOMOYO_PATH1_PARENT_UID]     = "path1.parent.uid",
+	[TOMOYO_PATH1_PARENT_GID]     = "path1.parent.gid",
+	[TOMOYO_PATH1_PARENT_INO]     = "path1.parent.ino",
+	[TOMOYO_PATH1_PARENT_PERM]    = "path1.parent.perm",
+	[TOMOYO_PATH2_PARENT_UID]     = "path2.parent.uid",
+	[TOMOYO_PATH2_PARENT_GID]     = "path2.parent.gid",
+	[TOMOYO_PATH2_PARENT_INO]     = "path2.parent.ino",
+	[TOMOYO_PATH2_PARENT_PERM]    = "path2.parent.perm",
+};
+
+/* String table for PREFERENCE keyword. */
+static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
+	[TOMOYO_PREF_MAX_AUDIT_LOG]      = "max_audit_log",
+	[TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
+};
+
+/* String table for path operation. */
+const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
+	[TOMOYO_TYPE_EXECUTE]    = "execute",
+	[TOMOYO_TYPE_READ]       = "read",
+	[TOMOYO_TYPE_WRITE]      = "write",
+	[TOMOYO_TYPE_APPEND]     = "append",
+	[TOMOYO_TYPE_UNLINK]     = "unlink",
+	[TOMOYO_TYPE_GETATTR]    = "getattr",
+	[TOMOYO_TYPE_RMDIR]      = "rmdir",
+	[TOMOYO_TYPE_TRUNCATE]   = "truncate",
+	[TOMOYO_TYPE_SYMLINK]    = "symlink",
+	[TOMOYO_TYPE_CHROOT]     = "chroot",
+	[TOMOYO_TYPE_UMOUNT]     = "unmount",
+};
+
+/* String table for socket's operation. */
+const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION] = {
+	[TOMOYO_NETWORK_BIND]    = "bind",
+	[TOMOYO_NETWORK_LISTEN]  = "listen",
+	[TOMOYO_NETWORK_CONNECT] = "connect",
+	[TOMOYO_NETWORK_SEND]    = "send",
+};
+
+/* String table for categories. */
+static const char * const tomoyo_category_keywords
+[TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
+	[TOMOYO_MAC_CATEGORY_FILE]    = "file",
+	[TOMOYO_MAC_CATEGORY_NETWORK] = "network",
+	[TOMOYO_MAC_CATEGORY_MISC]    = "misc",
+};
+
+/* Permit policy management by non-root user? */
+static bool tomoyo_manage_by_non_root;
+
+/* Utility functions. */
+
+/**
+ * tomoyo_yesno - Return "yes" or "no".
+ *
+ * @value: Bool value.
+ */
+const char *tomoyo_yesno(const unsigned int value)
+{
+	return value ? "yes" : "no";
+}
+
+/**
+ * tomoyo_addprintf - strncat()-like-snprintf().
+ *
+ * @buffer: Buffer to write to. Must be '\0'-terminated.
+ * @len:    Size of @buffer.
+ * @fmt:    The printf()'s format string, followed by parameters.
+ *
+ * Returns nothing.
+ */
+static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
+{
+	va_list args;
+	const int pos = strlen(buffer);
+	va_start(args, fmt);
+	vsnprintf(buffer + pos, len - pos - 1, fmt, args);
+	va_end(args);
+}
+
+/**
+ * tomoyo_flush - Flush queued string to userspace's buffer.
+ *
+ * @head:   Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns true if all data was flushed, false otherwise.
+ */
+static bool tomoyo_flush(struct tomoyo_io_buffer *head)
+{
+	while (head->r.w_pos) {
+		const char *w = head->r.w[0];
+		size_t len = strlen(w);
+		if (len) {
+			if (len > head->read_user_buf_avail)
+				len = head->read_user_buf_avail;
+			if (!len)
+				return false;
+			if (copy_to_user(head->read_user_buf, w, len))
+				return false;
+			head->read_user_buf_avail -= len;
+			head->read_user_buf += len;
+			w += len;
+		}
+		head->r.w[0] = w;
+		if (*w)
+			return false;
+		/* Add '\0' for audit logs and query. */
+		if (head->poll) {
+			if (!head->read_user_buf_avail ||
+			    copy_to_user(head->read_user_buf, "", 1))
+				return false;
+			head->read_user_buf_avail--;
+			head->read_user_buf++;
+		}
+		head->r.w_pos--;
+		for (len = 0; len < head->r.w_pos; len++)
+			head->r.w[len] = head->r.w[len + 1];
+	}
+	head->r.avail = 0;
+	return true;
+}
+
+/**
+ * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
+ *
+ * @head:   Pointer to "struct tomoyo_io_buffer".
+ * @string: String to print.
+ *
+ * Note that @string has to be kept valid until @head is kfree()d.
+ * This means that char[] allocated on stack memory cannot be passed to
+ * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
+ */
+static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
+{
+	if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
+		head->r.w[head->r.w_pos++] = string;
+		tomoyo_flush(head);
+	} else
+		WARN_ON(1);
+}
+
+static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
+			     ...) __printf(2, 3);
+
+/**
+ * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @fmt:  The printf()'s format string, followed by parameters.
+ */
+static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
+			     ...)
+{
+	va_list args;
+	size_t len;
+	size_t pos = head->r.avail;
+	int size = head->readbuf_size - pos;
+	if (size <= 0)
+		return;
+	va_start(args, fmt);
+	len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
+	va_end(args);
+	if (pos + len >= head->readbuf_size) {
+		WARN_ON(1);
+		return;
+	}
+	head->r.avail += len;
+	tomoyo_set_string(head, head->read_buf + pos);
+}
+
+/**
+ * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_set_space(struct tomoyo_io_buffer *head)
+{
+	tomoyo_set_string(head, " ");
+}
+
+/**
+ * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns nothing.
+ */
+static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
+{
+	tomoyo_set_string(head, "\n");
+	return !head->r.w_pos;
+}
+
+/**
+ * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
+{
+	tomoyo_set_string(head, "/");
+}
+
+/* List of namespaces. */
+LIST_HEAD(tomoyo_namespace_list);
+/* True if namespace other than tomoyo_kernel_namespace is defined. */
+static bool tomoyo_namespace_enabled;
+
+/**
+ * tomoyo_init_policy_namespace - Initialize namespace.
+ *
+ * @ns: Pointer to "struct tomoyo_policy_namespace".
+ *
+ * Returns nothing.
+ */
+void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
+{
+	unsigned int idx;
+	for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
+		INIT_LIST_HEAD(&ns->acl_group[idx]);
+	for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
+		INIT_LIST_HEAD(&ns->group_list[idx]);
+	for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
+		INIT_LIST_HEAD(&ns->policy_list[idx]);
+	ns->profile_version = 20110903;
+	tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
+	list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
+}
+
+/**
+ * tomoyo_print_namespace - Print namespace header.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
+{
+	if (!tomoyo_namespace_enabled)
+		return;
+	tomoyo_set_string(head,
+			  container_of(head->r.ns,
+				       struct tomoyo_policy_namespace,
+				       namespace_list)->name);
+	tomoyo_set_space(head);
+}
+
+/**
+ * tomoyo_print_name_union - Print a tomoyo_name_union.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @ptr:  Pointer to "struct tomoyo_name_union".
+ */
+static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
+				    const struct tomoyo_name_union *ptr)
+{
+	tomoyo_set_space(head);
+	if (ptr->group) {
+		tomoyo_set_string(head, "@");
+		tomoyo_set_string(head, ptr->group->group_name->name);
+	} else {
+		tomoyo_set_string(head, ptr->filename->name);
+	}
+}
+
+/**
+ * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @ptr:  Pointer to "struct tomoyo_name_union".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
+					   const struct tomoyo_name_union *ptr)
+{
+	if (ptr->group) {
+		tomoyo_set_string(head, "@");
+		tomoyo_set_string(head, ptr->group->group_name->name);
+	} else {
+		tomoyo_set_string(head, "\"");
+		tomoyo_set_string(head, ptr->filename->name);
+		tomoyo_set_string(head, "\"");
+	}
+}
+
+/**
+ * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @ptr:  Pointer to "struct tomoyo_number_union".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_print_number_union_nospace
+(struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
+{
+	if (ptr->group) {
+		tomoyo_set_string(head, "@");
+		tomoyo_set_string(head, ptr->group->group_name->name);
+	} else {
+		int i;
+		unsigned long min = ptr->values[0];
+		const unsigned long max = ptr->values[1];
+		u8 min_type = ptr->value_type[0];
+		const u8 max_type = ptr->value_type[1];
+		char buffer[128];
+		buffer[0] = '\0';
+		for (i = 0; i < 2; i++) {
+			switch (min_type) {
+			case TOMOYO_VALUE_TYPE_HEXADECIMAL:
+				tomoyo_addprintf(buffer, sizeof(buffer),
+						 "0x%lX", min);
+				break;
+			case TOMOYO_VALUE_TYPE_OCTAL:
+				tomoyo_addprintf(buffer, sizeof(buffer),
+						 "0%lo", min);
+				break;
+			default:
+				tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
+						 min);
+				break;
+			}
+			if (min == max && min_type == max_type)
+				break;
+			tomoyo_addprintf(buffer, sizeof(buffer), "-");
+			min_type = max_type;
+			min = max;
+		}
+		tomoyo_io_printf(head, "%s", buffer);
+	}
+}
+
+/**
+ * tomoyo_print_number_union - Print a tomoyo_number_union.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @ptr:  Pointer to "struct tomoyo_number_union".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
+				      const struct tomoyo_number_union *ptr)
+{
+	tomoyo_set_space(head);
+	tomoyo_print_number_union_nospace(head, ptr);
+}
+
+/**
+ * tomoyo_assign_profile - Create a new profile.
+ *
+ * @ns:      Pointer to "struct tomoyo_policy_namespace".
+ * @profile: Profile number to create.
+ *
+ * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
+ */
+static struct tomoyo_profile *tomoyo_assign_profile
+(struct tomoyo_policy_namespace *ns, const unsigned int profile)
+{
+	struct tomoyo_profile *ptr;
+	struct tomoyo_profile *entry;
+	if (profile >= TOMOYO_MAX_PROFILES)
+		return NULL;
+	ptr = ns->profile_ptr[profile];
+	if (ptr)
+		return ptr;
+	entry = kzalloc(sizeof(*entry), GFP_NOFS);
+	if (mutex_lock_interruptible(&tomoyo_policy_lock))
+		goto out;
+	ptr = ns->profile_ptr[profile];
+	if (!ptr && tomoyo_memory_ok(entry)) {
+		ptr = entry;
+		ptr->default_config = TOMOYO_CONFIG_DISABLED |
+			TOMOYO_CONFIG_WANT_GRANT_LOG |
+			TOMOYO_CONFIG_WANT_REJECT_LOG;
+		memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
+		       sizeof(ptr->config));
+		ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] =
+			CONFIG_SECURITY_TOMOYO_MAX_AUDIT_LOG;
+		ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] =
+			CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY;
+		mb(); /* Avoid out-of-order execution. */
+		ns->profile_ptr[profile] = ptr;
+		entry = NULL;
+	}
+	mutex_unlock(&tomoyo_policy_lock);
+ out:
+	kfree(entry);
+	return ptr;
+}
+
+/**
+ * tomoyo_profile - Find a profile.
+ *
+ * @ns:      Pointer to "struct tomoyo_policy_namespace".
+ * @profile: Profile number to find.
+ *
+ * Returns pointer to "struct tomoyo_profile".
+ */
+struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
+				      const u8 profile)
+{
+	static struct tomoyo_profile tomoyo_null_profile;
+	struct tomoyo_profile *ptr = ns->profile_ptr[profile];
+	if (!ptr)
+		ptr = &tomoyo_null_profile;
+	return ptr;
+}
+
+/**
+ * tomoyo_find_yesno - Find values for specified keyword.
+ *
+ * @string: String to check.
+ * @find:   Name of keyword.
+ *
+ * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
+ */
+static s8 tomoyo_find_yesno(const char *string, const char *find)
+{
+	const char *cp = strstr(string, find);
+	if (cp) {
+		cp += strlen(find);
+		if (!strncmp(cp, "=yes", 4))
+			return 1;
+		else if (!strncmp(cp, "=no", 3))
+			return 0;
+	}
+	return -1;
+}
+
+/**
+ * tomoyo_set_uint - Set value for specified preference.
+ *
+ * @i:      Pointer to "unsigned int".
+ * @string: String to check.
+ * @find:   Name of keyword.
+ *
+ * Returns nothing.
+ */
+static void tomoyo_set_uint(unsigned int *i, const char *string,
+			    const char *find)
+{
+	const char *cp = strstr(string, find);
+	if (cp)
+		sscanf(cp + strlen(find), "=%u", i);
+}
+
+/**
+ * tomoyo_set_mode - Set mode for specified profile.
+ *
+ * @name:    Name of functionality.
+ * @value:   Mode for @name.
+ * @profile: Pointer to "struct tomoyo_profile".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_set_mode(char *name, const char *value,
+			   struct tomoyo_profile *profile)
+{
+	u8 i;
+	u8 config;
+	if (!strcmp(name, "CONFIG")) {
+		i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
+		config = profile->default_config;
+	} else if (tomoyo_str_starts(&name, "CONFIG::")) {
+		config = 0;
+		for (i = 0; i < TOMOYO_MAX_MAC_INDEX
+			     + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
+			int len = 0;
+			if (i < TOMOYO_MAX_MAC_INDEX) {
+				const u8 c = tomoyo_index2category[i];
+				const char *category =
+					tomoyo_category_keywords[c];
+				len = strlen(category);
+				if (strncmp(name, category, len) ||
+				    name[len++] != ':' || name[len++] != ':')
+					continue;
+			}
+			if (strcmp(name + len, tomoyo_mac_keywords[i]))
+				continue;
+			config = profile->config[i];
+			break;
+		}
+		if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
+			return -EINVAL;
+	} else {
+		return -EINVAL;
+	}
+	if (strstr(value, "use_default")) {
+		config = TOMOYO_CONFIG_USE_DEFAULT;
+	} else {
+		u8 mode;
+		for (mode = 0; mode < 4; mode++)
+			if (strstr(value, tomoyo_mode[mode]))
+				/*
+				 * Update lower 3 bits in order to distinguish
+				 * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
+				 */
+				config = (config & ~7) | mode;
+		if (config != TOMOYO_CONFIG_USE_DEFAULT) {
+			switch (tomoyo_find_yesno(value, "grant_log")) {
+			case 1:
+				config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
+				break;
+			case 0:
+				config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
+				break;
+			}
+			switch (tomoyo_find_yesno(value, "reject_log")) {
+			case 1:
+				config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
+				break;
+			case 0:
+				config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
+				break;
+			}
+		}
+	}
+	if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
+		profile->config[i] = config;
+	else if (config != TOMOYO_CONFIG_USE_DEFAULT)
+		profile->default_config = config;
+	return 0;
+}
+
+/**
+ * tomoyo_write_profile - Write profile table.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
+{
+	char *data = head->write_buf;
+	unsigned int i;
+	char *cp;
+	struct tomoyo_profile *profile;
+	if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
+	    == 1)
+		return 0;
+	i = simple_strtoul(data, &cp, 10);
+	if (*cp != '-')
+		return -EINVAL;
+	data = cp + 1;
+	profile = tomoyo_assign_profile(head->w.ns, i);
+	if (!profile)
+		return -EINVAL;
+	cp = strchr(data, '=');
+	if (!cp)
+		return -EINVAL;
+	*cp++ = '\0';
+	if (!strcmp(data, "COMMENT")) {
+		static DEFINE_SPINLOCK(lock);
+		const struct tomoyo_path_info *new_comment
+			= tomoyo_get_name(cp);
+		const struct tomoyo_path_info *old_comment;
+		if (!new_comment)
+			return -ENOMEM;
+		spin_lock(&lock);
+		old_comment = profile->comment;
+		profile->comment = new_comment;
+		spin_unlock(&lock);
+		tomoyo_put_name(old_comment);
+		return 0;
+	}
+	if (!strcmp(data, "PREFERENCE")) {
+		for (i = 0; i < TOMOYO_MAX_PREF; i++)
+			tomoyo_set_uint(&profile->pref[i], cp,
+					tomoyo_pref_keywords[i]);
+		return 0;
+	}
+	return tomoyo_set_mode(data, cp, profile);
+}
+
+/**
+ * tomoyo_print_config - Print mode for specified functionality.
+ *
+ * @head:   Pointer to "struct tomoyo_io_buffer".
+ * @config: Mode for that functionality.
+ *
+ * Returns nothing.
+ *
+ * Caller prints functionality's name.
+ */
+static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
+{
+	tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
+			 tomoyo_mode[config & 3],
+			 tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
+			 tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
+}
+
+/**
+ * tomoyo_read_profile - Read profile table.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
+{
+	u8 index;
+	struct tomoyo_policy_namespace *ns =
+		container_of(head->r.ns, typeof(*ns), namespace_list);
+	const struct tomoyo_profile *profile;
+	if (head->r.eof)
+		return;
+ next:
+	index = head->r.index;
+	profile = ns->profile_ptr[index];
+	switch (head->r.step) {
+	case 0:
+		tomoyo_print_namespace(head);
+		tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
+				 ns->profile_version);
+		head->r.step++;
+		break;
+	case 1:
+		for ( ; head->r.index < TOMOYO_MAX_PROFILES;
+		      head->r.index++)
+			if (ns->profile_ptr[head->r.index])
+				break;
+		if (head->r.index == TOMOYO_MAX_PROFILES) {
+			head->r.eof = true;
+			return;
+		}
+		head->r.step++;
+		break;
+	case 2:
+		{
+			u8 i;
+			const struct tomoyo_path_info *comment =
+				profile->comment;
+			tomoyo_print_namespace(head);
+			tomoyo_io_printf(head, "%u-COMMENT=", index);
+			tomoyo_set_string(head, comment ? comment->name : "");
+			tomoyo_set_lf(head);
+			tomoyo_print_namespace(head);
+			tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
+			for (i = 0; i < TOMOYO_MAX_PREF; i++)
+				tomoyo_io_printf(head, "%s=%u ",
+						 tomoyo_pref_keywords[i],
+						 profile->pref[i]);
+			tomoyo_set_string(head, "}\n");
+			head->r.step++;
+		}
+		break;
+	case 3:
+		{
+			tomoyo_print_namespace(head);
+			tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
+			tomoyo_print_config(head, profile->default_config);
+			head->r.bit = 0;
+			head->r.step++;
+		}
+		break;
+	case 4:
+		for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
+			      + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
+			const u8 i = head->r.bit;
+			const u8 config = profile->config[i];
+			if (config == TOMOYO_CONFIG_USE_DEFAULT)
+				continue;
+			tomoyo_print_namespace(head);
+			if (i < TOMOYO_MAX_MAC_INDEX)
+				tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
+						 index,
+						 tomoyo_category_keywords
+						 [tomoyo_index2category[i]],
+						 tomoyo_mac_keywords[i]);
+			else
+				tomoyo_io_printf(head, "%u-CONFIG::%s", index,
+						 tomoyo_mac_keywords[i]);
+			tomoyo_print_config(head, config);
+			head->r.bit++;
+			break;
+		}
+		if (head->r.bit == TOMOYO_MAX_MAC_INDEX
+		    + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
+			head->r.index++;
+			head->r.step = 1;
+		}
+		break;
+	}
+	if (tomoyo_flush(head))
+		goto next;
+}
+
+/**
+ * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_head".
+ * @b: Pointer to "struct tomoyo_acl_head".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
+				const struct tomoyo_acl_head *b)
+{
+	return container_of(a, struct tomoyo_manager, head)->manager ==
+		container_of(b, struct tomoyo_manager, head)->manager;
+}
+
+/**
+ * tomoyo_update_manager_entry - Add a manager entry.
+ *
+ * @manager:   The path to manager or the domainnamme.
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_update_manager_entry(const char *manager,
+				       const bool is_delete)
+{
+	struct tomoyo_manager e = { };
+	struct tomoyo_acl_param param = {
+		/* .ns = &tomoyo_kernel_namespace, */
+		.is_delete = is_delete,
+		.list = &tomoyo_kernel_namespace.
+		policy_list[TOMOYO_ID_MANAGER],
+	};
+	int error = is_delete ? -ENOENT : -ENOMEM;
+	if (!tomoyo_correct_domain(manager) &&
+	    !tomoyo_correct_word(manager))
+		return -EINVAL;
+	e.manager = tomoyo_get_name(manager);
+	if (e.manager) {
+		error = tomoyo_update_policy(&e.head, sizeof(e), &param,
+					     tomoyo_same_manager);
+		tomoyo_put_name(e.manager);
+	}
+	return error;
+}
+
+/**
+ * tomoyo_write_manager - Write manager policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
+{
+	char *data = head->write_buf;
+
+	if (!strcmp(data, "manage_by_non_root")) {
+		tomoyo_manage_by_non_root = !head->w.is_delete;
+		return 0;
+	}
+	return tomoyo_update_manager_entry(data, head->w.is_delete);
+}
+
+/**
+ * tomoyo_read_manager - Read manager policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
+{
+	if (head->r.eof)
+		return;
+	list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
+			     policy_list[TOMOYO_ID_MANAGER]) {
+		struct tomoyo_manager *ptr =
+			list_entry(head->r.acl, typeof(*ptr), head.list);
+		if (ptr->head.is_deleted)
+			continue;
+		if (!tomoyo_flush(head))
+			return;
+		tomoyo_set_string(head, ptr->manager->name);
+		tomoyo_set_lf(head);
+	}
+	head->r.eof = true;
+}
+
+/**
+ * tomoyo_manager - Check whether the current process is a policy manager.
+ *
+ * Returns true if the current process is permitted to modify policy
+ * via /sys/kernel/security/tomoyo/ interface.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static bool tomoyo_manager(void)
+{
+	struct tomoyo_manager *ptr;
+	const char *exe;
+	const struct task_struct *task = current;
+	const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
+	bool found = false;
+
+	if (!tomoyo_policy_loaded)
+		return true;
+	if (!tomoyo_manage_by_non_root &&
+	    (!uid_eq(task->cred->uid,  GLOBAL_ROOT_UID) ||
+	     !uid_eq(task->cred->euid, GLOBAL_ROOT_UID)))
+		return false;
+	exe = tomoyo_get_exe();
+	if (!exe)
+		return false;
+	list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
+				policy_list[TOMOYO_ID_MANAGER], head.list) {
+		if (!ptr->head.is_deleted &&
+		    (!tomoyo_pathcmp(domainname, ptr->manager) ||
+		     !strcmp(exe, ptr->manager->name))) {
+			found = true;
+			break;
+		}
+	}
+	if (!found) { /* Reduce error messages. */
+		static pid_t last_pid;
+		const pid_t pid = current->pid;
+		if (last_pid != pid) {
+			printk(KERN_WARNING "%s ( %s ) is not permitted to "
+			       "update policies.\n", domainname->name, exe);
+			last_pid = pid;
+		}
+	}
+	kfree(exe);
+	return found;
+}
+
+static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
+(unsigned int serial);
+
+/**
+ * tomoyo_select_domain - Parse select command.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @data: String to parse.
+ *
+ * Returns true on success, false otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
+				 const char *data)
+{
+	unsigned int pid;
+	struct tomoyo_domain_info *domain = NULL;
+	bool global_pid = false;
+	if (strncmp(data, "select ", 7))
+		return false;
+	data += 7;
+	if (sscanf(data, "pid=%u", &pid) == 1 ||
+	    (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
+		struct task_struct *p;
+		rcu_read_lock();
+		if (global_pid)
+			p = find_task_by_pid_ns(pid, &init_pid_ns);
+		else
+			p = find_task_by_vpid(pid);
+		if (p)
+			domain = tomoyo_real_domain(p);
+		rcu_read_unlock();
+	} else if (!strncmp(data, "domain=", 7)) {
+		if (tomoyo_domain_def(data + 7))
+			domain = tomoyo_find_domain(data + 7);
+	} else if (sscanf(data, "Q=%u", &pid) == 1) {
+		domain = tomoyo_find_domain_by_qid(pid);
+	} else
+		return false;
+	head->w.domain = domain;
+	/* Accessing read_buf is safe because head->io_sem is held. */
+	if (!head->read_buf)
+		return true; /* Do nothing if open(O_WRONLY). */
+	memset(&head->r, 0, sizeof(head->r));
+	head->r.print_this_domain_only = true;
+	if (domain)
+		head->r.domain = &domain->list;
+	else
+		head->r.eof = 1;
+	tomoyo_io_printf(head, "# select %s\n", data);
+	if (domain && domain->is_deleted)
+		tomoyo_io_printf(head, "# This is a deleted domain.\n");
+	return true;
+}
+
+/**
+ * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
+			      const struct tomoyo_acl_info *b)
+{
+	const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
+	const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
+	return p1->domainname == p2->domainname;
+}
+
+/**
+ * tomoyo_write_task - Update task related list.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_write_task(struct tomoyo_acl_param *param)
+{
+	int error = -EINVAL;
+	if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
+		struct tomoyo_task_acl e = {
+			.head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
+			.domainname = tomoyo_get_domainname(param),
+		};
+		if (e.domainname)
+			error = tomoyo_update_domain(&e.head, sizeof(e), param,
+						     tomoyo_same_task_acl,
+						     NULL);
+		tomoyo_put_name(e.domainname);
+	}
+	return error;
+}
+
+/**
+ * tomoyo_delete_domain - Delete a domain.
+ *
+ * @domainname: The name of domain.
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_delete_domain(char *domainname)
+{
+	struct tomoyo_domain_info *domain;
+	struct tomoyo_path_info name;
+
+	name.name = domainname;
+	tomoyo_fill_path_info(&name);
+	if (mutex_lock_interruptible(&tomoyo_policy_lock))
+		return -EINTR;
+	/* Is there an active domain? */
+	list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
+		/* Never delete tomoyo_kernel_domain */
+		if (domain == &tomoyo_kernel_domain)
+			continue;
+		if (domain->is_deleted ||
+		    tomoyo_pathcmp(domain->domainname, &name))
+			continue;
+		domain->is_deleted = true;
+		break;
+	}
+	mutex_unlock(&tomoyo_policy_lock);
+	return 0;
+}
+
+/**
+ * tomoyo_write_domain2 - Write domain policy.
+ *
+ * @ns:        Pointer to "struct tomoyo_policy_namespace".
+ * @list:      Pointer to "struct list_head".
+ * @data:      Policy to be interpreted.
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
+				struct list_head *list, char *data,
+				const bool is_delete)
+{
+	struct tomoyo_acl_param param = {
+		.ns = ns,
+		.list = list,
+		.data = data,
+		.is_delete = is_delete,
+	};
+	static const struct {
+		const char *keyword;
+		int (*write) (struct tomoyo_acl_param *);
+	} tomoyo_callback[5] = {
+		{ "file ", tomoyo_write_file },
+		{ "network inet ", tomoyo_write_inet_network },
+		{ "network unix ", tomoyo_write_unix_network },
+		{ "misc ", tomoyo_write_misc },
+		{ "task ", tomoyo_write_task },
+	};
+	u8 i;
+
+	for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
+		if (!tomoyo_str_starts(&param.data,
+				       tomoyo_callback[i].keyword))
+			continue;
+		return tomoyo_callback[i].write(&param);
+	}
+	return -EINVAL;
+}
+
+/* String table for domain flags. */
+const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
+	[TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
+	[TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
+};
+
+/**
+ * tomoyo_write_domain - Write domain policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
+{
+	char *data = head->write_buf;
+	struct tomoyo_policy_namespace *ns;
+	struct tomoyo_domain_info *domain = head->w.domain;
+	const bool is_delete = head->w.is_delete;
+	bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
+	unsigned int profile;
+	if (*data == '<') {
+		int ret = 0;
+		domain = NULL;
+		if (is_delete)
+			ret = tomoyo_delete_domain(data);
+		else if (is_select)
+			domain = tomoyo_find_domain(data);
+		else
+			domain = tomoyo_assign_domain(data, false);
+		head->w.domain = domain;
+		return ret;
+	}
+	if (!domain)
+		return -EINVAL;
+	ns = domain->ns;
+	if (sscanf(data, "use_profile %u", &profile) == 1
+	    && profile < TOMOYO_MAX_PROFILES) {
+		if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
+			domain->profile = (u8) profile;
+		return 0;
+	}
+	if (sscanf(data, "use_group %u\n", &profile) == 1
+	    && profile < TOMOYO_MAX_ACL_GROUPS) {
+		if (!is_delete)
+			domain->group = (u8) profile;
+		return 0;
+	}
+	for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
+		const char *cp = tomoyo_dif[profile];
+		if (strncmp(data, cp, strlen(cp) - 1))
+			continue;
+		domain->flags[profile] = !is_delete;
+		return 0;
+	}
+	return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
+				    is_delete);
+}
+
+/**
+ * tomoyo_print_condition - Print condition part.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @cond: Pointer to "struct tomoyo_condition".
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
+				   const struct tomoyo_condition *cond)
+{
+	switch (head->r.cond_step) {
+	case 0:
+		head->r.cond_index = 0;
+		head->r.cond_step++;
+		if (cond->transit) {
+			tomoyo_set_space(head);
+			tomoyo_set_string(head, cond->transit->name);
+		}
+		/* fall through */
+	case 1:
+		{
+			const u16 condc = cond->condc;
+			const struct tomoyo_condition_element *condp =
+				(typeof(condp)) (cond + 1);
+			const struct tomoyo_number_union *numbers_p =
+				(typeof(numbers_p)) (condp + condc);
+			const struct tomoyo_name_union *names_p =
+				(typeof(names_p))
+				(numbers_p + cond->numbers_count);
+			const struct tomoyo_argv *argv =
+				(typeof(argv)) (names_p + cond->names_count);
+			const struct tomoyo_envp *envp =
+				(typeof(envp)) (argv + cond->argc);
+			u16 skip;
+			for (skip = 0; skip < head->r.cond_index; skip++) {
+				const u8 left = condp->left;
+				const u8 right = condp->right;
+				condp++;
+				switch (left) {
+				case TOMOYO_ARGV_ENTRY:
+					argv++;
+					continue;
+				case TOMOYO_ENVP_ENTRY:
+					envp++;
+					continue;
+				case TOMOYO_NUMBER_UNION:
+					numbers_p++;
+					break;
+				}
+				switch (right) {
+				case TOMOYO_NAME_UNION:
+					names_p++;
+					break;
+				case TOMOYO_NUMBER_UNION:
+					numbers_p++;
+					break;
+				}
+			}
+			while (head->r.cond_index < condc) {
+				const u8 match = condp->equals;
+				const u8 left = condp->left;
+				const u8 right = condp->right;
+				if (!tomoyo_flush(head))
+					return false;
+				condp++;
+				head->r.cond_index++;
+				tomoyo_set_space(head);
+				switch (left) {
+				case TOMOYO_ARGV_ENTRY:
+					tomoyo_io_printf(head,
+							 "exec.argv[%lu]%s=\"",
+							 argv->index, argv->
+							 is_not ? "!" : "");
+					tomoyo_set_string(head,
+							  argv->value->name);
+					tomoyo_set_string(head, "\"");
+					argv++;
+					continue;
+				case TOMOYO_ENVP_ENTRY:
+					tomoyo_set_string(head,
+							  "exec.envp[\"");
+					tomoyo_set_string(head,
+							  envp->name->name);
+					tomoyo_io_printf(head, "\"]%s=", envp->
+							 is_not ? "!" : "");
+					if (envp->value) {
+						tomoyo_set_string(head, "\"");
+						tomoyo_set_string(head, envp->
+								  value->name);
+						tomoyo_set_string(head, "\"");
+					} else {
+						tomoyo_set_string(head,
+								  "NULL");
+					}
+					envp++;
+					continue;
+				case TOMOYO_NUMBER_UNION:
+					tomoyo_print_number_union_nospace
+						(head, numbers_p++);
+					break;
+				default:
+					tomoyo_set_string(head,
+					       tomoyo_condition_keyword[left]);
+					break;
+				}
+				tomoyo_set_string(head, match ? "=" : "!=");
+				switch (right) {
+				case TOMOYO_NAME_UNION:
+					tomoyo_print_name_union_quoted
+						(head, names_p++);
+					break;
+				case TOMOYO_NUMBER_UNION:
+					tomoyo_print_number_union_nospace
+						(head, numbers_p++);
+					break;
+				default:
+					tomoyo_set_string(head,
+					  tomoyo_condition_keyword[right]);
+					break;
+				}
+			}
+		}
+		head->r.cond_step++;
+		/* fall through */
+	case 2:
+		if (!tomoyo_flush(head))
+			break;
+		head->r.cond_step++;
+		/* fall through */
+	case 3:
+		if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
+			tomoyo_io_printf(head, " grant_log=%s",
+					 tomoyo_yesno(cond->grant_log ==
+						      TOMOYO_GRANTLOG_YES));
+		tomoyo_set_lf(head);
+		return true;
+	}
+	return false;
+}
+
+/**
+ * tomoyo_set_group - Print "acl_group " header keyword and category name.
+ *
+ * @head:     Pointer to "struct tomoyo_io_buffer".
+ * @category: Category name.
+ *
+ * Returns nothing.
+ */
+static void tomoyo_set_group(struct tomoyo_io_buffer *head,
+			     const char *category)
+{
+	if (head->type == TOMOYO_EXCEPTIONPOLICY) {
+		tomoyo_print_namespace(head);
+		tomoyo_io_printf(head, "acl_group %u ",
+				 head->r.acl_group_index);
+	}
+	tomoyo_set_string(head, category);
+}
+
+/**
+ * tomoyo_print_entry - Print an ACL entry.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @acl:  Pointer to an ACL entry.
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
+			       struct tomoyo_acl_info *acl)
+{
+	const u8 acl_type = acl->type;
+	bool first = true;
+	u8 bit;
+
+	if (head->r.print_cond_part)
+		goto print_cond_part;
+	if (acl->is_deleted)
+		return true;
+	if (!tomoyo_flush(head))
+		return false;
+	else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
+		struct tomoyo_path_acl *ptr =
+			container_of(acl, typeof(*ptr), head);
+		const u16 perm = ptr->perm;
+		for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
+			if (!(perm & (1 << bit)))
+				continue;
+			if (head->r.print_transition_related_only &&
+			    bit != TOMOYO_TYPE_EXECUTE)
+				continue;
+			if (first) {
+				tomoyo_set_group(head, "file ");
+				first = false;
+			} else {
+				tomoyo_set_slash(head);
+			}
+			tomoyo_set_string(head, tomoyo_path_keyword[bit]);
+		}
+		if (first)
+			return true;
+		tomoyo_print_name_union(head, &ptr->name);
+	} else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
+		struct tomoyo_task_acl *ptr =
+			container_of(acl, typeof(*ptr), head);
+		tomoyo_set_group(head, "task ");
+		tomoyo_set_string(head, "manual_domain_transition ");
+		tomoyo_set_string(head, ptr->domainname->name);
+	} else if (head->r.print_transition_related_only) {
+		return true;
+	} else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
+		struct tomoyo_path2_acl *ptr =
+			container_of(acl, typeof(*ptr), head);
+		const u8 perm = ptr->perm;
+		for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
+			if (!(perm & (1 << bit)))
+				continue;
+			if (first) {
+				tomoyo_set_group(head, "file ");
+				first = false;
+			} else {
+				tomoyo_set_slash(head);
+			}
+			tomoyo_set_string(head, tomoyo_mac_keywords
+					  [tomoyo_pp2mac[bit]]);
+		}
+		if (first)
+			return true;
+		tomoyo_print_name_union(head, &ptr->name1);
+		tomoyo_print_name_union(head, &ptr->name2);
+	} else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
+		struct tomoyo_path_number_acl *ptr =
+			container_of(acl, typeof(*ptr), head);
+		const u8 perm = ptr->perm;
+		for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
+			if (!(perm & (1 << bit)))
+				continue;
+			if (first) {
+				tomoyo_set_group(head, "file ");
+				first = false;
+			} else {
+				tomoyo_set_slash(head);
+			}
+			tomoyo_set_string(head, tomoyo_mac_keywords
+					  [tomoyo_pn2mac[bit]]);
+		}
+		if (first)
+			return true;
+		tomoyo_print_name_union(head, &ptr->name);
+		tomoyo_print_number_union(head, &ptr->number);
+	} else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
+		struct tomoyo_mkdev_acl *ptr =
+			container_of(acl, typeof(*ptr), head);
+		const u8 perm = ptr->perm;
+		for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
+			if (!(perm & (1 << bit)))
+				continue;
+			if (first) {
+				tomoyo_set_group(head, "file ");
+				first = false;
+			} else {
+				tomoyo_set_slash(head);
+			}
+			tomoyo_set_string(head, tomoyo_mac_keywords
+					  [tomoyo_pnnn2mac[bit]]);
+		}
+		if (first)
+			return true;
+		tomoyo_print_name_union(head, &ptr->name);
+		tomoyo_print_number_union(head, &ptr->mode);
+		tomoyo_print_number_union(head, &ptr->major);
+		tomoyo_print_number_union(head, &ptr->minor);
+	} else if (acl_type == TOMOYO_TYPE_INET_ACL) {
+		struct tomoyo_inet_acl *ptr =
+			container_of(acl, typeof(*ptr), head);
+		const u8 perm = ptr->perm;
+
+		for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
+			if (!(perm & (1 << bit)))
+				continue;
+			if (first) {
+				tomoyo_set_group(head, "network inet ");
+				tomoyo_set_string(head, tomoyo_proto_keyword
+						  [ptr->protocol]);
+				tomoyo_set_space(head);
+				first = false;
+			} else {
+				tomoyo_set_slash(head);
+			}
+			tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
+		}
+		if (first)
+			return true;
+		tomoyo_set_space(head);
+		if (ptr->address.group) {
+			tomoyo_set_string(head, "@");
+			tomoyo_set_string(head, ptr->address.group->group_name
+					  ->name);
+		} else {
+			char buf[128];
+			tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
+			tomoyo_io_printf(head, "%s", buf);
+		}
+		tomoyo_print_number_union(head, &ptr->port);
+	} else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
+		struct tomoyo_unix_acl *ptr =
+			container_of(acl, typeof(*ptr), head);
+		const u8 perm = ptr->perm;
+
+		for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
+			if (!(perm & (1 << bit)))
+				continue;
+			if (first) {
+				tomoyo_set_group(head, "network unix ");
+				tomoyo_set_string(head, tomoyo_proto_keyword
+						  [ptr->protocol]);
+				tomoyo_set_space(head);
+				first = false;
+			} else {
+				tomoyo_set_slash(head);
+			}
+			tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
+		}
+		if (first)
+			return true;
+		tomoyo_print_name_union(head, &ptr->name);
+	} else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
+		struct tomoyo_mount_acl *ptr =
+			container_of(acl, typeof(*ptr), head);
+		tomoyo_set_group(head, "file mount");
+		tomoyo_print_name_union(head, &ptr->dev_name);
+		tomoyo_print_name_union(head, &ptr->dir_name);
+		tomoyo_print_name_union(head, &ptr->fs_type);
+		tomoyo_print_number_union(head, &ptr->flags);
+	} else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
+		struct tomoyo_env_acl *ptr =
+			container_of(acl, typeof(*ptr), head);
+
+		tomoyo_set_group(head, "misc env ");
+		tomoyo_set_string(head, ptr->env->name);
+	}
+	if (acl->cond) {
+		head->r.print_cond_part = true;
+		head->r.cond_step = 0;
+		if (!tomoyo_flush(head))
+			return false;
+print_cond_part:
+		if (!tomoyo_print_condition(head, acl->cond))
+			return false;
+		head->r.print_cond_part = false;
+	} else {
+		tomoyo_set_lf(head);
+	}
+	return true;
+}
+
+/**
+ * tomoyo_read_domain2 - Read domain policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @list: Pointer to "struct list_head".
+ *
+ * Caller holds tomoyo_read_lock().
+ *
+ * Returns true on success, false otherwise.
+ */
+static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
+				struct list_head *list)
+{
+	list_for_each_cookie(head->r.acl, list) {
+		struct tomoyo_acl_info *ptr =
+			list_entry(head->r.acl, typeof(*ptr), list);
+		if (!tomoyo_print_entry(head, ptr))
+			return false;
+	}
+	head->r.acl = NULL;
+	return true;
+}
+
+/**
+ * tomoyo_read_domain - Read domain policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
+{
+	if (head->r.eof)
+		return;
+	list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
+		struct tomoyo_domain_info *domain =
+			list_entry(head->r.domain, typeof(*domain), list);
+		switch (head->r.step) {
+			u8 i;
+		case 0:
+			if (domain->is_deleted &&
+			    !head->r.print_this_domain_only)
+				continue;
+			/* Print domainname and flags. */
+			tomoyo_set_string(head, domain->domainname->name);
+			tomoyo_set_lf(head);
+			tomoyo_io_printf(head, "use_profile %u\n",
+					 domain->profile);
+			tomoyo_io_printf(head, "use_group %u\n",
+					 domain->group);
+			for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
+				if (domain->flags[i])
+					tomoyo_set_string(head, tomoyo_dif[i]);
+			head->r.step++;
+			tomoyo_set_lf(head);
+			/* fall through */
+		case 1:
+			if (!tomoyo_read_domain2(head, &domain->acl_info_list))
+				return;
+			head->r.step++;
+			if (!tomoyo_set_lf(head))
+				return;
+			/* fall through */
+		case 2:
+			head->r.step = 0;
+			if (head->r.print_this_domain_only)
+				goto done;
+		}
+	}
+ done:
+	head->r.eof = true;
+}
+
+/**
+ * tomoyo_write_pid: Specify PID to obtain domainname.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0.
+ */
+static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
+{
+	head->r.eof = false;
+	return 0;
+}
+
+/**
+ * tomoyo_read_pid - Get domainname of the specified PID.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns the domainname which the specified PID is in on success,
+ * empty string otherwise.
+ * The PID is specified by tomoyo_write_pid() so that the user can obtain
+ * using read()/write() interface rather than sysctl() interface.
+ */
+static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
+{
+	char *buf = head->write_buf;
+	bool global_pid = false;
+	unsigned int pid;
+	struct task_struct *p;
+	struct tomoyo_domain_info *domain = NULL;
+
+	/* Accessing write_buf is safe because head->io_sem is held. */
+	if (!buf) {
+		head->r.eof = true;
+		return; /* Do nothing if open(O_RDONLY). */
+	}
+	if (head->r.w_pos || head->r.eof)
+		return;
+	head->r.eof = true;
+	if (tomoyo_str_starts(&buf, "global-pid "))
+		global_pid = true;
+	pid = (unsigned int) simple_strtoul(buf, NULL, 10);
+	rcu_read_lock();
+	if (global_pid)
+		p = find_task_by_pid_ns(pid, &init_pid_ns);
+	else
+		p = find_task_by_vpid(pid);
+	if (p)
+		domain = tomoyo_real_domain(p);
+	rcu_read_unlock();
+	if (!domain)
+		return;
+	tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
+	tomoyo_set_string(head, domain->domainname->name);
+}
+
+/* String table for domain transition control keywords. */
+static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
+	[TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
+	[TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
+	[TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
+	[TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
+	[TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
+	[TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
+};
+
+/* String table for grouping keywords. */
+static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
+	[TOMOYO_PATH_GROUP]    = "path_group ",
+	[TOMOYO_NUMBER_GROUP]  = "number_group ",
+	[TOMOYO_ADDRESS_GROUP] = "address_group ",
+};
+
+/**
+ * tomoyo_write_exception - Write exception policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
+{
+	const bool is_delete = head->w.is_delete;
+	struct tomoyo_acl_param param = {
+		.ns = head->w.ns,
+		.is_delete = is_delete,
+		.data = head->write_buf,
+	};
+	u8 i;
+	if (tomoyo_str_starts(&param.data, "aggregator "))
+		return tomoyo_write_aggregator(&param);
+	for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
+		if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
+			return tomoyo_write_transition_control(&param, i);
+	for (i = 0; i < TOMOYO_MAX_GROUP; i++)
+		if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
+			return tomoyo_write_group(&param, i);
+	if (tomoyo_str_starts(&param.data, "acl_group ")) {
+		unsigned int group;
+		char *data;
+		group = simple_strtoul(param.data, &data, 10);
+		if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
+			return tomoyo_write_domain2
+				(head->w.ns, &head->w.ns->acl_group[group],
+				 data, is_delete);
+	}
+	return -EINVAL;
+}
+
+/**
+ * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @idx:  Index number.
+ *
+ * Returns true on success, false otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
+{
+	struct tomoyo_policy_namespace *ns =
+		container_of(head->r.ns, typeof(*ns), namespace_list);
+	struct list_head *list = &ns->group_list[idx];
+	list_for_each_cookie(head->r.group, list) {
+		struct tomoyo_group *group =
+			list_entry(head->r.group, typeof(*group), head.list);
+		list_for_each_cookie(head->r.acl, &group->member_list) {
+			struct tomoyo_acl_head *ptr =
+				list_entry(head->r.acl, typeof(*ptr), list);
+			if (ptr->is_deleted)
+				continue;
+			if (!tomoyo_flush(head))
+				return false;
+			tomoyo_print_namespace(head);
+			tomoyo_set_string(head, tomoyo_group_name[idx]);
+			tomoyo_set_string(head, group->group_name->name);
+			if (idx == TOMOYO_PATH_GROUP) {
+				tomoyo_set_space(head);
+				tomoyo_set_string(head, container_of
+					       (ptr, struct tomoyo_path_group,
+						head)->member_name->name);
+			} else if (idx == TOMOYO_NUMBER_GROUP) {
+				tomoyo_print_number_union(head, &container_of
+							  (ptr,
+						   struct tomoyo_number_group,
+							   head)->number);
+			} else if (idx == TOMOYO_ADDRESS_GROUP) {
+				char buffer[128];
+
+				struct tomoyo_address_group *member =
+					container_of(ptr, typeof(*member),
+						     head);
+				tomoyo_print_ip(buffer, sizeof(buffer),
+						&member->address);
+				tomoyo_io_printf(head, " %s", buffer);
+			}
+			tomoyo_set_lf(head);
+		}
+		head->r.acl = NULL;
+	}
+	head->r.group = NULL;
+	return true;
+}
+
+/**
+ * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ * @idx:  Index number.
+ *
+ * Returns true on success, false otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
+{
+	struct tomoyo_policy_namespace *ns =
+		container_of(head->r.ns, typeof(*ns), namespace_list);
+	struct list_head *list = &ns->policy_list[idx];
+	list_for_each_cookie(head->r.acl, list) {
+		struct tomoyo_acl_head *acl =
+			container_of(head->r.acl, typeof(*acl), list);
+		if (acl->is_deleted)
+			continue;
+		if (!tomoyo_flush(head))
+			return false;
+		switch (idx) {
+		case TOMOYO_ID_TRANSITION_CONTROL:
+			{
+				struct tomoyo_transition_control *ptr =
+					container_of(acl, typeof(*ptr), head);
+				tomoyo_print_namespace(head);
+				tomoyo_set_string(head, tomoyo_transition_type
+						  [ptr->type]);
+				tomoyo_set_string(head, ptr->program ?
+						  ptr->program->name : "any");
+				tomoyo_set_string(head, " from ");
+				tomoyo_set_string(head, ptr->domainname ?
+						  ptr->domainname->name :
+						  "any");
+			}
+			break;
+		case TOMOYO_ID_AGGREGATOR:
+			{
+				struct tomoyo_aggregator *ptr =
+					container_of(acl, typeof(*ptr), head);
+				tomoyo_print_namespace(head);
+				tomoyo_set_string(head, "aggregator ");
+				tomoyo_set_string(head,
+						  ptr->original_name->name);
+				tomoyo_set_space(head);
+				tomoyo_set_string(head,
+					       ptr->aggregated_name->name);
+			}
+			break;
+		default:
+			continue;
+		}
+		tomoyo_set_lf(head);
+	}
+	head->r.acl = NULL;
+	return true;
+}
+
+/**
+ * tomoyo_read_exception - Read exception policy.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
+{
+	struct tomoyo_policy_namespace *ns =
+		container_of(head->r.ns, typeof(*ns), namespace_list);
+	if (head->r.eof)
+		return;
+	while (head->r.step < TOMOYO_MAX_POLICY &&
+	       tomoyo_read_policy(head, head->r.step))
+		head->r.step++;
+	if (head->r.step < TOMOYO_MAX_POLICY)
+		return;
+	while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
+	       tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
+		head->r.step++;
+	if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
+		return;
+	while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
+	       + TOMOYO_MAX_ACL_GROUPS) {
+		head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
+			- TOMOYO_MAX_GROUP;
+		if (!tomoyo_read_domain2(head, &ns->acl_group
+					 [head->r.acl_group_index]))
+			return;
+		head->r.step++;
+	}
+	head->r.eof = true;
+}
+
+/* Wait queue for kernel -> userspace notification. */
+static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
+/* Wait queue for userspace -> kernel notification. */
+static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
+
+/* Structure for query. */
+struct tomoyo_query {
+	struct list_head list;
+	struct tomoyo_domain_info *domain;
+	char *query;
+	size_t query_len;
+	unsigned int serial;
+	u8 timer;
+	u8 answer;
+	u8 retry;
+};
+
+/* The list for "struct tomoyo_query". */
+static LIST_HEAD(tomoyo_query_list);
+
+/* Lock for manipulating tomoyo_query_list. */
+static DEFINE_SPINLOCK(tomoyo_query_list_lock);
+
+/*
+ * Number of "struct file" referring /sys/kernel/security/tomoyo/query
+ * interface.
+ */
+static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
+
+/**
+ * tomoyo_truncate - Truncate a line.
+ *
+ * @str: String to truncate.
+ *
+ * Returns length of truncated @str.
+ */
+static int tomoyo_truncate(char *str)
+{
+	char *start = str;
+	while (*(unsigned char *) str > (unsigned char) ' ')
+		str++;
+	*str = '\0';
+	return strlen(start) + 1;
+}
+
+/**
+ * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
+ *
+ * @domain: Pointer to "struct tomoyo_domain_info".
+ * @header: Lines containing ACL.
+ *
+ * Returns nothing.
+ */
+static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
+{
+	char *buffer;
+	char *realpath = NULL;
+	char *argv0 = NULL;
+	char *symlink = NULL;
+	char *cp = strchr(header, '\n');
+	int len;
+	if (!cp)
+		return;
+	cp = strchr(cp + 1, '\n');
+	if (!cp)
+		return;
+	*cp++ = '\0';
+	len = strlen(cp) + 1;
+	/* strstr() will return NULL if ordering is wrong. */
+	if (*cp == 'f') {
+		argv0 = strstr(header, " argv[]={ \"");
+		if (argv0) {
+			argv0 += 10;
+			len += tomoyo_truncate(argv0) + 14;
+		}
+		realpath = strstr(header, " exec={ realpath=\"");
+		if (realpath) {
+			realpath += 8;
+			len += tomoyo_truncate(realpath) + 6;
+		}
+		symlink = strstr(header, " symlink.target=\"");
+		if (symlink)
+			len += tomoyo_truncate(symlink + 1) + 1;
+	}
+	buffer = kmalloc(len, GFP_NOFS);
+	if (!buffer)
+		return;
+	snprintf(buffer, len - 1, "%s", cp);
+	if (realpath)
+		tomoyo_addprintf(buffer, len, " exec.%s", realpath);
+	if (argv0)
+		tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
+	if (symlink)
+		tomoyo_addprintf(buffer, len, "%s", symlink);
+	tomoyo_normalize_line(buffer);
+	if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
+				  false))
+		tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
+	kfree(buffer);
+}
+
+/**
+ * tomoyo_supervisor - Ask for the supervisor's decision.
+ *
+ * @r:   Pointer to "struct tomoyo_request_info".
+ * @fmt: The printf()'s format string, followed by parameters.
+ *
+ * Returns 0 if the supervisor decided to permit the access request which
+ * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
+ * supervisor decided to retry the access request which violated the policy in
+ * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
+ */
+int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
+{
+	va_list args;
+	int error;
+	int len;
+	static unsigned int tomoyo_serial;
+	struct tomoyo_query entry = { };
+	bool quota_exceeded = false;
+	va_start(args, fmt);
+	len = vsnprintf((char *) &len, 1, fmt, args) + 1;
+	va_end(args);
+	/* Write /sys/kernel/security/tomoyo/audit. */
+	va_start(args, fmt);
+	tomoyo_write_log2(r, len, fmt, args);
+	va_end(args);
+	/* Nothing more to do if granted. */
+	if (r->granted)
+		return 0;
+	if (r->mode)
+		tomoyo_update_stat(r->mode);
+	switch (r->mode) {
+	case TOMOYO_CONFIG_ENFORCING:
+		error = -EPERM;
+		if (atomic_read(&tomoyo_query_observers))
+			break;
+		goto out;
+	case TOMOYO_CONFIG_LEARNING:
+		error = 0;
+		/* Check max_learning_entry parameter. */
+		if (tomoyo_domain_quota_is_ok(r))
+			break;
+		/* fall through */
+	default:
+		return 0;
+	}
+	/* Get message. */
+	va_start(args, fmt);
+	entry.query = tomoyo_init_log(r, len, fmt, args);
+	va_end(args);
+	if (!entry.query)
+		goto out;
+	entry.query_len = strlen(entry.query) + 1;
+	if (!error) {
+		tomoyo_add_entry(r->domain, entry.query);
+		goto out;
+	}
+	len = tomoyo_round2(entry.query_len);
+	entry.domain = r->domain;
+	spin_lock(&tomoyo_query_list_lock);
+	if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
+	    tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
+	    >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
+		quota_exceeded = true;
+	} else {
+		entry.serial = tomoyo_serial++;
+		entry.retry = r->retry;
+		tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
+		list_add_tail(&entry.list, &tomoyo_query_list);
+	}
+	spin_unlock(&tomoyo_query_list_lock);
+	if (quota_exceeded)
+		goto out;
+	/* Give 10 seconds for supervisor's opinion. */
+	while (entry.timer < 10) {
+		wake_up_all(&tomoyo_query_wait);
+		if (wait_event_interruptible_timeout
+		    (tomoyo_answer_wait, entry.answer ||
+		     !atomic_read(&tomoyo_query_observers), HZ))
+			break;
+		else
+			entry.timer++;
+	}
+	spin_lock(&tomoyo_query_list_lock);
+	list_del(&entry.list);
+	tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
+	spin_unlock(&tomoyo_query_list_lock);
+	switch (entry.answer) {
+	case 3: /* Asked to retry by administrator. */
+		error = TOMOYO_RETRY_REQUEST;
+		r->retry++;
+		break;
+	case 1:
+		/* Granted by administrator. */
+		error = 0;
+		break;
+	default:
+		/* Timed out or rejected by administrator. */
+		break;
+	}
+out:
+	kfree(entry.query);
+	return error;
+}
+
+/**
+ * tomoyo_find_domain_by_qid - Get domain by query id.
+ *
+ * @serial: Query ID assigned by tomoyo_supervisor().
+ *
+ * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
+ */
+static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
+(unsigned int serial)
+{
+	struct tomoyo_query *ptr;
+	struct tomoyo_domain_info *domain = NULL;
+	spin_lock(&tomoyo_query_list_lock);
+	list_for_each_entry(ptr, &tomoyo_query_list, list) {
+		if (ptr->serial != serial)
+			continue;
+		domain = ptr->domain;
+		break;
+	}
+	spin_unlock(&tomoyo_query_list_lock);
+	return domain;
+}
+
+/**
+ * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
+ *
+ * @file: Pointer to "struct file".
+ * @wait: Pointer to "poll_table".
+ *
+ * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
+ *
+ * Waits for access requests which violated policy in enforcing mode.
+ */
+static unsigned int tomoyo_poll_query(struct file *file, poll_table *wait)
+{
+	if (!list_empty(&tomoyo_query_list))
+		return POLLIN | POLLRDNORM;
+	poll_wait(file, &tomoyo_query_wait, wait);
+	if (!list_empty(&tomoyo_query_list))
+		return POLLIN | POLLRDNORM;
+	return 0;
+}
+
+/**
+ * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ */
+static void tomoyo_read_query(struct tomoyo_io_buffer *head)
+{
+	struct list_head *tmp;
+	unsigned int pos = 0;
+	size_t len = 0;
+	char *buf;
+	if (head->r.w_pos)
+		return;
+	if (head->read_buf) {
+		kfree(head->read_buf);
+		head->read_buf = NULL;
+	}
+	spin_lock(&tomoyo_query_list_lock);
+	list_for_each(tmp, &tomoyo_query_list) {
+		struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
+		if (pos++ != head->r.query_index)
+			continue;
+		len = ptr->query_len;
+		break;
+	}
+	spin_unlock(&tomoyo_query_list_lock);
+	if (!len) {
+		head->r.query_index = 0;
+		return;
+	}
+	buf = kzalloc(len + 32, GFP_NOFS);
+	if (!buf)
+		return;
+	pos = 0;
+	spin_lock(&tomoyo_query_list_lock);
+	list_for_each(tmp, &tomoyo_query_list) {
+		struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
+		if (pos++ != head->r.query_index)
+			continue;
+		/*
+		 * Some query can be skipped because tomoyo_query_list
+		 * can change, but I don't care.
+		 */
+		if (len == ptr->query_len)
+			snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
+				 ptr->retry, ptr->query);
+		break;
+	}
+	spin_unlock(&tomoyo_query_list_lock);
+	if (buf[0]) {
+		head->read_buf = buf;
+		head->r.w[head->r.w_pos++] = buf;
+		head->r.query_index++;
+	} else {
+		kfree(buf);
+	}
+}
+
+/**
+ * tomoyo_write_answer - Write the supervisor's decision.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0 on success, -EINVAL otherwise.
+ */
+static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
+{
+	char *data = head->write_buf;
+	struct list_head *tmp;
+	unsigned int serial;
+	unsigned int answer;
+	spin_lock(&tomoyo_query_list_lock);
+	list_for_each(tmp, &tomoyo_query_list) {
+		struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
+		ptr->timer = 0;
+	}
+	spin_unlock(&tomoyo_query_list_lock);
+	if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
+		return -EINVAL;
+	spin_lock(&tomoyo_query_list_lock);
+	list_for_each(tmp, &tomoyo_query_list) {
+		struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
+		if (ptr->serial != serial)
+			continue;
+		ptr->answer = answer;
+		/* Remove from tomoyo_query_list. */
+		if (ptr->answer)
+			list_del_init(&ptr->list);
+		break;
+	}
+	spin_unlock(&tomoyo_query_list_lock);
+	return 0;
+}
+
+/**
+ * tomoyo_read_version: Get version.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns version information.
+ */
+static void tomoyo_read_version(struct tomoyo_io_buffer *head)
+{
+	if (!head->r.eof) {
+		tomoyo_io_printf(head, "2.5.0");
+		head->r.eof = true;
+	}
+}
+
+/* String table for /sys/kernel/security/tomoyo/stat interface. */
+static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
+	[TOMOYO_STAT_POLICY_UPDATES]    = "update:",
+	[TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
+	[TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
+	[TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
+};
+
+/* String table for /sys/kernel/security/tomoyo/stat interface. */
+static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
+	[TOMOYO_MEMORY_POLICY] = "policy:",
+	[TOMOYO_MEMORY_AUDIT]  = "audit log:",
+	[TOMOYO_MEMORY_QUERY]  = "query message:",
+};
+
+/* Timestamp counter for last updated. */
+static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
+/* Counter for number of updates. */
+static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
+
+/**
+ * tomoyo_update_stat - Update statistic counters.
+ *
+ * @index: Index for policy type.
+ *
+ * Returns nothing.
+ */
+void tomoyo_update_stat(const u8 index)
+{
+	/*
+	 * I don't use atomic operations because race condition is not fatal.
+	 */
+	tomoyo_stat_updated[index]++;
+	tomoyo_stat_modified[index] = get_seconds();
+}
+
+/**
+ * tomoyo_read_stat - Read statistic data.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns nothing.
+ */
+static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
+{
+	u8 i;
+	unsigned int total = 0;
+	if (head->r.eof)
+		return;
+	for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
+		tomoyo_io_printf(head, "Policy %-30s %10u",
+				 tomoyo_policy_headers[i],
+				 tomoyo_stat_updated[i]);
+		if (tomoyo_stat_modified[i]) {
+			struct tomoyo_time stamp;
+			tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
+			tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
+					 "%02u:%02u:%02u)",
+					 stamp.year, stamp.month, stamp.day,
+					 stamp.hour, stamp.min, stamp.sec);
+		}
+		tomoyo_set_lf(head);
+	}
+	for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
+		unsigned int used = tomoyo_memory_used[i];
+		total += used;
+		tomoyo_io_printf(head, "Memory used by %-22s %10u",
+				 tomoyo_memory_headers[i], used);
+		used = tomoyo_memory_quota[i];
+		if (used)
+			tomoyo_io_printf(head, " (Quota: %10u)", used);
+		tomoyo_set_lf(head);
+	}
+	tomoyo_io_printf(head, "Total memory used:                    %10u\n",
+			 total);
+	head->r.eof = true;
+}
+
+/**
+ * tomoyo_write_stat - Set memory quota.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns 0.
+ */
+static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
+{
+	char *data = head->write_buf;
+	u8 i;
+	if (tomoyo_str_starts(&data, "Memory used by "))
+		for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
+			if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
+				sscanf(data, "%u", &tomoyo_memory_quota[i]);
+	return 0;
+}
+
+/**
+ * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @type: Type of interface.
+ * @file: Pointer to "struct file".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+int tomoyo_open_control(const u8 type, struct file *file)
+{
+	struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
+
+	if (!head)
+		return -ENOMEM;
+	mutex_init(&head->io_sem);
+	head->type = type;
+	switch (type) {
+	case TOMOYO_DOMAINPOLICY:
+		/* /sys/kernel/security/tomoyo/domain_policy */
+		head->write = tomoyo_write_domain;
+		head->read = tomoyo_read_domain;
+		break;
+	case TOMOYO_EXCEPTIONPOLICY:
+		/* /sys/kernel/security/tomoyo/exception_policy */
+		head->write = tomoyo_write_exception;
+		head->read = tomoyo_read_exception;
+		break;
+	case TOMOYO_AUDIT:
+		/* /sys/kernel/security/tomoyo/audit */
+		head->poll = tomoyo_poll_log;
+		head->read = tomoyo_read_log;
+		break;
+	case TOMOYO_PROCESS_STATUS:
+		/* /sys/kernel/security/tomoyo/.process_status */
+		head->write = tomoyo_write_pid;
+		head->read = tomoyo_read_pid;
+		break;
+	case TOMOYO_VERSION:
+		/* /sys/kernel/security/tomoyo/version */
+		head->read = tomoyo_read_version;
+		head->readbuf_size = 128;
+		break;
+	case TOMOYO_STAT:
+		/* /sys/kernel/security/tomoyo/stat */
+		head->write = tomoyo_write_stat;
+		head->read = tomoyo_read_stat;
+		head->readbuf_size = 1024;
+		break;
+	case TOMOYO_PROFILE:
+		/* /sys/kernel/security/tomoyo/profile */
+		head->write = tomoyo_write_profile;
+		head->read = tomoyo_read_profile;
+		break;
+	case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
+		head->poll = tomoyo_poll_query;
+		head->write = tomoyo_write_answer;
+		head->read = tomoyo_read_query;
+		break;
+	case TOMOYO_MANAGER:
+		/* /sys/kernel/security/tomoyo/manager */
+		head->write = tomoyo_write_manager;
+		head->read = tomoyo_read_manager;
+		break;
+	}
+	if (!(file->f_mode & FMODE_READ)) {
+		/*
+		 * No need to allocate read_buf since it is not opened
+		 * for reading.
+		 */
+		head->read = NULL;
+		head->poll = NULL;
+	} else if (!head->poll) {
+		/* Don't allocate read_buf for poll() access. */
+		if (!head->readbuf_size)
+			head->readbuf_size = 4096 * 2;
+		head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
+		if (!head->read_buf) {
+			kfree(head);
+			return -ENOMEM;
+		}
+	}
+	if (!(file->f_mode & FMODE_WRITE)) {
+		/*
+		 * No need to allocate write_buf since it is not opened
+		 * for writing.
+		 */
+		head->write = NULL;
+	} else if (head->write) {
+		head->writebuf_size = 4096 * 2;
+		head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
+		if (!head->write_buf) {
+			kfree(head->read_buf);
+			kfree(head);
+			return -ENOMEM;
+		}
+	}
+	/*
+	 * If the file is /sys/kernel/security/tomoyo/query , increment the
+	 * observer counter.
+	 * The obserber counter is used by tomoyo_supervisor() to see if
+	 * there is some process monitoring /sys/kernel/security/tomoyo/query.
+	 */
+	if (type == TOMOYO_QUERY)
+		atomic_inc(&tomoyo_query_observers);
+	file->private_data = head;
+	tomoyo_notify_gc(head, true);
+	return 0;
+}
+
+/**
+ * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @file: Pointer to "struct file".
+ * @wait: Pointer to "poll_table". Maybe NULL.
+ *
+ * Returns POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM if ready to read/write,
+ * POLLOUT | POLLWRNORM otherwise.
+ */
+unsigned int tomoyo_poll_control(struct file *file, poll_table *wait)
+{
+	struct tomoyo_io_buffer *head = file->private_data;
+	if (head->poll)
+		return head->poll(file, wait) | POLLOUT | POLLWRNORM;
+	return POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM;
+}
+
+/**
+ * tomoyo_set_namespace_cursor - Set namespace to read.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns nothing.
+ */
+static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
+{
+	struct list_head *ns;
+	if (head->type != TOMOYO_EXCEPTIONPOLICY &&
+	    head->type != TOMOYO_PROFILE)
+		return;
+	/*
+	 * If this is the first read, or reading previous namespace finished
+	 * and has more namespaces to read, update the namespace cursor.
+	 */
+	ns = head->r.ns;
+	if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
+		/* Clearing is OK because tomoyo_flush() returned true. */
+		memset(&head->r, 0, sizeof(head->r));
+		head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
+	}
+}
+
+/**
+ * tomoyo_has_more_namespace - Check for unread namespaces.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns true if we have more entries to print, false otherwise.
+ */
+static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
+{
+	return (head->type == TOMOYO_EXCEPTIONPOLICY ||
+		head->type == TOMOYO_PROFILE) && head->r.eof &&
+		head->r.ns->next != &tomoyo_namespace_list;
+}
+
+/**
+ * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @head:       Pointer to "struct tomoyo_io_buffer".
+ * @buffer:     Poiner to buffer to write to.
+ * @buffer_len: Size of @buffer.
+ *
+ * Returns bytes read on success, negative value otherwise.
+ */
+ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
+			    const int buffer_len)
+{
+	int len;
+	int idx;
+
+	if (!head->read)
+		return -ENOSYS;
+	if (mutex_lock_interruptible(&head->io_sem))
+		return -EINTR;
+	head->read_user_buf = buffer;
+	head->read_user_buf_avail = buffer_len;
+	idx = tomoyo_read_lock();
+	if (tomoyo_flush(head))
+		/* Call the policy handler. */
+		do {
+			tomoyo_set_namespace_cursor(head);
+			head->read(head);
+		} while (tomoyo_flush(head) &&
+			 tomoyo_has_more_namespace(head));
+	tomoyo_read_unlock(idx);
+	len = head->read_user_buf - buffer;
+	mutex_unlock(&head->io_sem);
+	return len;
+}
+
+/**
+ * tomoyo_parse_policy - Parse a policy line.
+ *
+ * @head: Poiter to "struct tomoyo_io_buffer".
+ * @line: Line to parse.
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
+{
+	/* Delete request? */
+	head->w.is_delete = !strncmp(line, "delete ", 7);
+	if (head->w.is_delete)
+		memmove(line, line + 7, strlen(line + 7) + 1);
+	/* Selecting namespace to update. */
+	if (head->type == TOMOYO_EXCEPTIONPOLICY ||
+	    head->type == TOMOYO_PROFILE) {
+		if (*line == '<') {
+			char *cp = strchr(line, ' ');
+			if (cp) {
+				*cp++ = '\0';
+				head->w.ns = tomoyo_assign_namespace(line);
+				memmove(line, cp, strlen(cp) + 1);
+			} else
+				head->w.ns = NULL;
+		} else
+			head->w.ns = &tomoyo_kernel_namespace;
+		/* Don't allow updating if namespace is invalid. */
+		if (!head->w.ns)
+			return -ENOENT;
+	}
+	/* Do the update. */
+	return head->write(head);
+}
+
+/**
+ * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @head:       Pointer to "struct tomoyo_io_buffer".
+ * @buffer:     Pointer to buffer to read from.
+ * @buffer_len: Size of @buffer.
+ *
+ * Returns @buffer_len on success, negative value otherwise.
+ */
+ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
+			     const char __user *buffer, const int buffer_len)
+{
+	int error = buffer_len;
+	size_t avail_len = buffer_len;
+	char *cp0 = head->write_buf;
+	int idx;
+	if (!head->write)
+		return -ENOSYS;
+	if (!access_ok(VERIFY_READ, buffer, buffer_len))
+		return -EFAULT;
+	if (mutex_lock_interruptible(&head->io_sem))
+		return -EINTR;
+	head->read_user_buf_avail = 0;
+	idx = tomoyo_read_lock();
+	/* Read a line and dispatch it to the policy handler. */
+	while (avail_len > 0) {
+		char c;
+		if (head->w.avail >= head->writebuf_size - 1) {
+			const int len = head->writebuf_size * 2;
+			char *cp = kzalloc(len, GFP_NOFS);
+			if (!cp) {
+				error = -ENOMEM;
+				break;
+			}
+			memmove(cp, cp0, head->w.avail);
+			kfree(cp0);
+			head->write_buf = cp;
+			cp0 = cp;
+			head->writebuf_size = len;
+		}
+		if (get_user(c, buffer)) {
+			error = -EFAULT;
+			break;
+		}
+		buffer++;
+		avail_len--;
+		cp0[head->w.avail++] = c;
+		if (c != '\n')
+			continue;
+		cp0[head->w.avail - 1] = '\0';
+		head->w.avail = 0;
+		tomoyo_normalize_line(cp0);
+		if (!strcmp(cp0, "reset")) {
+			head->w.ns = &tomoyo_kernel_namespace;
+			head->w.domain = NULL;
+			memset(&head->r, 0, sizeof(head->r));
+			continue;
+		}
+		/* Don't allow updating policies by non manager programs. */
+		switch (head->type) {
+		case TOMOYO_PROCESS_STATUS:
+			/* This does not write anything. */
+			break;
+		case TOMOYO_DOMAINPOLICY:
+			if (tomoyo_select_domain(head, cp0))
+				continue;
+			/* fall through */
+		case TOMOYO_EXCEPTIONPOLICY:
+			if (!strcmp(cp0, "select transition_only")) {
+				head->r.print_transition_related_only = true;
+				continue;
+			}
+			/* fall through */
+		default:
+			if (!tomoyo_manager()) {
+				error = -EPERM;
+				goto out;
+			}
+		}
+		switch (tomoyo_parse_policy(head, cp0)) {
+		case -EPERM:
+			error = -EPERM;
+			goto out;
+		case 0:
+			switch (head->type) {
+			case TOMOYO_DOMAINPOLICY:
+			case TOMOYO_EXCEPTIONPOLICY:
+			case TOMOYO_STAT:
+			case TOMOYO_PROFILE:
+			case TOMOYO_MANAGER:
+				tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
+				break;
+			default:
+				break;
+			}
+			break;
+		}
+	}
+out:
+	tomoyo_read_unlock(idx);
+	mutex_unlock(&head->io_sem);
+	return error;
+}
+
+/**
+ * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ */
+void tomoyo_close_control(struct tomoyo_io_buffer *head)
+{
+	/*
+	 * If the file is /sys/kernel/security/tomoyo/query , decrement the
+	 * observer counter.
+	 */
+	if (head->type == TOMOYO_QUERY &&
+	    atomic_dec_and_test(&tomoyo_query_observers))
+		wake_up_all(&tomoyo_answer_wait);
+	tomoyo_notify_gc(head, false);
+}
+
+/**
+ * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
+ */
+void tomoyo_check_profile(void)
+{
+	struct tomoyo_domain_info *domain;
+	const int idx = tomoyo_read_lock();
+	tomoyo_policy_loaded = true;
+	printk(KERN_INFO "TOMOYO: 2.5.0\n");
+	list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
+		const u8 profile = domain->profile;
+		const struct tomoyo_policy_namespace *ns = domain->ns;
+		if (ns->profile_version != 20110903)
+			printk(KERN_ERR
+			       "Profile version %u is not supported.\n",
+			       ns->profile_version);
+		else if (!ns->profile_ptr[profile])
+			printk(KERN_ERR
+			       "Profile %u (used by '%s') is not defined.\n",
+			       profile, domain->domainname->name);
+		else
+			continue;
+		printk(KERN_ERR
+		       "Userland tools for TOMOYO 2.5 must be installed and "
+		       "policy must be initialized.\n");
+		printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ "
+		       "for more information.\n");
+		panic("STOP!");
+	}
+	tomoyo_read_unlock(idx);
+	printk(KERN_INFO "Mandatory Access Control activated.\n");
+}
+
+/**
+ * tomoyo_load_builtin_policy - Load built-in policy.
+ *
+ * Returns nothing.
+ */
+void __init tomoyo_load_builtin_policy(void)
+{
+	/*
+	 * This include file is manually created and contains built-in policy
+	 * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
+	 * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
+	 * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
+	 */
+#include "builtin-policy.h"
+	u8 i;
+	const int idx = tomoyo_read_lock();
+	for (i = 0; i < 5; i++) {
+		struct tomoyo_io_buffer head = { };
+		char *start = "";
+		switch (i) {
+		case 0:
+			start = tomoyo_builtin_profile;
+			head.type = TOMOYO_PROFILE;
+			head.write = tomoyo_write_profile;
+			break;
+		case 1:
+			start = tomoyo_builtin_exception_policy;
+			head.type = TOMOYO_EXCEPTIONPOLICY;
+			head.write = tomoyo_write_exception;
+			break;
+		case 2:
+			start = tomoyo_builtin_domain_policy;
+			head.type = TOMOYO_DOMAINPOLICY;
+			head.write = tomoyo_write_domain;
+			break;
+		case 3:
+			start = tomoyo_builtin_manager;
+			head.type = TOMOYO_MANAGER;
+			head.write = tomoyo_write_manager;
+			break;
+		case 4:
+			start = tomoyo_builtin_stat;
+			head.type = TOMOYO_STAT;
+			head.write = tomoyo_write_stat;
+			break;
+		}
+		while (1) {
+			char *end = strchr(start, '\n');
+			if (!end)
+				break;
+			*end = '\0';
+			tomoyo_normalize_line(start);
+			head.write_buf = start;
+			tomoyo_parse_policy(&head, start);
+			start = end + 1;
+		}
+	}
+	tomoyo_read_unlock(idx);
+#ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
+	tomoyo_check_profile();
+#endif
+}