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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0
 /*
  * security/tomoyo/common.c
  *
  * Copyright (C) 2005-2011  NTT DATA CORPORATION
  */
 
 #include <linux/uaccess.h>
 #include <linux/slab.h>
 #include <linux/security.h>
 #include <linux/string_helpers.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_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 = 20150505;
     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 | __GFP_NOWARN);
     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_DEFAULT'.
                  */
                 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],
              str_yes_no(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
              str_yes_no(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 = IS_ENABLED(CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING);
 
     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,
                 srcu_read_lock_held(&tomoyo_ss)) {
         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) {
             pr_warn("%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_task(p)->domain_info;
         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 = true;
     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,
                 srcu_read_lock_held(&tomoyo_ss)) {
         /* 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 *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 idx;
 
     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", &idx) == 1
         && idx < TOMOYO_MAX_PROFILES) {
         if (!tomoyo_policy_loaded || ns->profile_ptr[idx])
             if (!is_delete)
                 domain->profile = (u8) idx;
         return 0;
     }
     if (sscanf(data, "use_group %u\n", &idx) == 1
         && idx < TOMOYO_MAX_ACL_GROUPS) {
         if (!is_delete)
             set_bit(idx, domain->group);
         else
             clear_bit(idx, domain->group);
         return 0;
     }
     for (idx = 0; idx < TOMOYO_MAX_DOMAIN_INFO_FLAGS; idx++) {
         const char *cp = tomoyo_dif[idx];
 
         if (strncmp(data, cp, strlen(cp) - 1))
             continue;
         domain->flags[idx] = !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);
         }
         fallthrough;
     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++;
         fallthrough;
     case 2:
         if (!tomoyo_flush(head))
             break;
         head->r.cond_step++;
         fallthrough;
     case 3:
         if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
             tomoyo_io_printf(head, " grant_log=%s",
                      str_yes_no(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);
         u8 i;
 
         switch (head->r.step) {
         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);
             for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
                 if (domain->flags[i])
                     tomoyo_set_string(head, tomoyo_dif[i]);
             head->r.index = 0;
             head->r.step++;
             fallthrough;
         case 1:
             while (head->r.index < TOMOYO_MAX_ACL_GROUPS) {
                 i = head->r.index++;
                 if (!test_bit(i, domain->group))
                     continue;
                 tomoyo_io_printf(head, "use_group %u\n", i);
                 if (!tomoyo_flush(head))
                     return;
             }
             head->r.index = 0;
             head->r.step++;
             tomoyo_set_lf(head);
             fallthrough;
         case 2:
             if (!tomoyo_read_domain2(head, &domain->acl_info_list))
                 return;
             head->r.step++;
             if (!tomoyo_set_lf(head))
                 return;
             fallthrough;
         case 3:
             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;
     if (kstrtouint(buf, 10, &pid))
         return;
     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_task(p)->domain_info;
     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;
         fallthrough;
     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;
         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 EPOLLIN | EPOLLRDNORM when ready to read, 0 otherwise.
  *
  * Waits for access requests which violated policy in enforcing mode.
  */
 static __poll_t tomoyo_poll_query(struct file *file, poll_table *wait)
 {
     if (!list_empty(&tomoyo_query_list))
         return EPOLLIN | EPOLLRDNORM;
     poll_wait(file, &tomoyo_query_wait, wait);
     if (!list_empty(&tomoyo_query_list))
         return EPOLLIN | EPOLLRDNORM;
     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;
     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, "2.6.0");
         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:",
 };
 
 /* Counter for number of updates. */
 static atomic_t tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
 /* Timestamp counter for last updated. */
 static time64_t 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)
 {
     atomic_inc(&tomoyo_stat_updated[index]);
     tomoyo_stat_modified[index] = ktime_get_real_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],
                  atomic_read(&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 EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM if ready to read/write,
  * EPOLLOUT | EPOLLWRNORM otherwise.
  */
 __poll_t 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) | EPOLLOUT | EPOLLWRNORM;
     return EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM;
 }
 
 /**
  * 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:     Pointer 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 -EINVAL;
     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: Pointer 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 -EINVAL;
     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;
             fallthrough;
         case TOMOYO_EXCEPTIONPOLICY:
             if (!strcmp(cp0, "select transition_only")) {
                 head->r.print_transition_related_only = true;
                 continue;
             }
             fallthrough;
         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;
     pr_info("TOMOYO: 2.6.0\n");
     list_for_each_entry_rcu(domain, &tomoyo_domain_list, list,
                 srcu_read_lock_held(&tomoyo_ss)) {
         const u8 profile = domain->profile;
         struct tomoyo_policy_namespace *ns = domain->ns;
 
         if (ns->profile_version == 20110903) {
             pr_info_once("Converting profile version from %u to %u.\n",
                      20110903, 20150505);
             ns->profile_version = 20150505;
         }
         if (ns->profile_version != 20150505)
             pr_err("Profile version %u is not supported.\n",
                    ns->profile_version);
         else if (!ns->profile_ptr[profile])
             pr_err("Profile %u (used by '%s') is not defined.\n",
                    profile, domain->domainname->name);
         else
             continue;
         pr_err("Userland tools for TOMOYO 2.6 must be installed and policy must be initialized.\n");
         pr_err("Please see https://tomoyo.osdn.jp/2.6/ for more information.\n");
         panic("STOP!");
     }
     tomoyo_read_unlock(idx);
     pr_info("Mandatory Access Control activated.\n");
 }
 
 /**
  * tomoyo_load_builtin_policy - Load built-in policy.
  *
  * Returns nothing.
  */
 void __init tomoyo_load_builtin_policy(void)
 {
 #ifdef CONFIG_SECURITY_TOMOYO_INSECURE_BUILTIN_SETTING
     static char tomoyo_builtin_profile[] __initdata =
         "PROFILE_VERSION=20150505\n"
         "0-CONFIG={ mode=learning grant_log=no reject_log=yes }\n";
     static char tomoyo_builtin_exception_policy[] __initdata =
         "aggregator proc:/self/exe /proc/self/exe\n";
     static char tomoyo_builtin_domain_policy[] __initdata = "";
     static char tomoyo_builtin_manager[] __initdata = "";
     static char tomoyo_builtin_stat[] __initdata = "";
 #else
     /*
      * 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"
 #endif
     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
 }