Merge commit 'v2.6.34-rc6' into core/locking

1 files changed, 415 insertions, 115 deletions

diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h
index 92169d29b2db..67bd22dd3e68 100644
--- a/security/tomoyo/common.h
+++ b/security/tomoyo/common.h
@@ -1,12 +1,9 @@
 /*
  * security/tomoyo/common.h
  *
- * Common functions for TOMOYO.
- *
- * Copyright (C) 2005-2009  NTT DATA CORPORATION
- *
- * Version: 2.2.0   2009/04/01
+ * Header file for TOMOYO.
  *
+ * Copyright (C) 2005-2010  NTT DATA CORPORATION
  */
 
 #ifndef _SECURITY_TOMOYO_COMMON_H
@@ -22,9 +19,119 @@
 #include <linux/namei.h>
 #include <linux/mount.h>
 #include <linux/list.h>
+#include <linux/cred.h>
+struct linux_binprm;
+
+/********** Constants definitions. **********/
+
+/*
+ * TOMOYO uses this hash only when appending a string into the string
+ * table. Frequency of appending strings is very low. So we don't need
+ * large (e.g. 64k) hash size. 256 will be sufficient.
+ */
+#define TOMOYO_HASH_BITS  8
+#define TOMOYO_MAX_HASH (1u<<TOMOYO_HASH_BITS)
+
+/*
+ * This is the max length of a token.
+ *
+ * A token consists of only ASCII printable characters.
+ * Non printable characters in a token is represented in \ooo style
+ * octal string. Thus, \ itself is represented as \\.
+ */
+#define TOMOYO_MAX_PATHNAME_LEN 4000
+
+/* Profile number is an integer between 0 and 255. */
+#define TOMOYO_MAX_PROFILES 256
+
+/* Keywords for ACLs. */
+#define TOMOYO_KEYWORD_ALIAS                     "alias "
+#define TOMOYO_KEYWORD_ALLOW_READ                "allow_read "
+#define TOMOYO_KEYWORD_DELETE                    "delete "
+#define TOMOYO_KEYWORD_DENY_REWRITE              "deny_rewrite "
+#define TOMOYO_KEYWORD_FILE_PATTERN              "file_pattern "
+#define TOMOYO_KEYWORD_INITIALIZE_DOMAIN         "initialize_domain "
+#define TOMOYO_KEYWORD_KEEP_DOMAIN               "keep_domain "
+#define TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN      "no_initialize_domain "
+#define TOMOYO_KEYWORD_NO_KEEP_DOMAIN            "no_keep_domain "
+#define TOMOYO_KEYWORD_SELECT                    "select "
+#define TOMOYO_KEYWORD_USE_PROFILE               "use_profile "
+#define TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ  "ignore_global_allow_read"
+/* A domain definition starts with <kernel>. */
+#define TOMOYO_ROOT_NAME                         "<kernel>"
+#define TOMOYO_ROOT_NAME_LEN                     (sizeof(TOMOYO_ROOT_NAME) - 1)
+
+/* Index numbers for Access Controls. */
+enum tomoyo_mac_index {
+	TOMOYO_MAC_FOR_FILE,  /* domain_policy.conf */
+	TOMOYO_MAX_ACCEPT_ENTRY,
+	TOMOYO_VERBOSE,
+	TOMOYO_MAX_CONTROL_INDEX
+};
+
+/* Index numbers for Access Controls. */
+enum tomoyo_acl_entry_type_index {
+	TOMOYO_TYPE_PATH_ACL,
+	TOMOYO_TYPE_PATH2_ACL,
+};
+
+/* Index numbers for File Controls. */
+
+/*
+ * TYPE_READ_WRITE_ACL is special. TYPE_READ_WRITE_ACL is automatically set
+ * if both TYPE_READ_ACL and TYPE_WRITE_ACL are set. Both TYPE_READ_ACL and
+ * TYPE_WRITE_ACL are automatically set if TYPE_READ_WRITE_ACL is set.
+ * TYPE_READ_WRITE_ACL is automatically cleared if either TYPE_READ_ACL or
+ * TYPE_WRITE_ACL is cleared. Both TYPE_READ_ACL and TYPE_WRITE_ACL are
+ * automatically cleared if TYPE_READ_WRITE_ACL is cleared.
+ */
+
+enum tomoyo_path_acl_index {
+	TOMOYO_TYPE_READ_WRITE,
+	TOMOYO_TYPE_EXECUTE,
+	TOMOYO_TYPE_READ,
+	TOMOYO_TYPE_WRITE,
+	TOMOYO_TYPE_CREATE,
+	TOMOYO_TYPE_UNLINK,
+	TOMOYO_TYPE_MKDIR,
+	TOMOYO_TYPE_RMDIR,
+	TOMOYO_TYPE_MKFIFO,
+	TOMOYO_TYPE_MKSOCK,
+	TOMOYO_TYPE_MKBLOCK,
+	TOMOYO_TYPE_MKCHAR,
+	TOMOYO_TYPE_TRUNCATE,
+	TOMOYO_TYPE_SYMLINK,
+	TOMOYO_TYPE_REWRITE,
+	TOMOYO_TYPE_IOCTL,
+	TOMOYO_TYPE_CHMOD,
+	TOMOYO_TYPE_CHOWN,
+	TOMOYO_TYPE_CHGRP,
+	TOMOYO_TYPE_CHROOT,
+	TOMOYO_TYPE_MOUNT,
+	TOMOYO_TYPE_UMOUNT,
+	TOMOYO_MAX_PATH_OPERATION
+};
 
-struct dentry;
-struct vfsmount;
+enum tomoyo_path2_acl_index {
+	TOMOYO_TYPE_LINK,
+	TOMOYO_TYPE_RENAME,
+	TOMOYO_TYPE_PIVOT_ROOT,
+	TOMOYO_MAX_PATH2_OPERATION
+};
+
+enum tomoyo_securityfs_interface_index {
+	TOMOYO_DOMAINPOLICY,
+	TOMOYO_EXCEPTIONPOLICY,
+	TOMOYO_DOMAIN_STATUS,
+	TOMOYO_PROCESS_STATUS,
+	TOMOYO_MEMINFO,
+	TOMOYO_SELFDOMAIN,
+	TOMOYO_VERSION,
+	TOMOYO_PROFILE,
+	TOMOYO_MANAGER
+};
+
+/********** Structure definitions. **********/
 
 /*
  * tomoyo_page_buffer is a structure which is used for holding a pathname
@@ -66,13 +173,14 @@ struct tomoyo_path_info {
 };
 
 /*
- * This is the max length of a token.
- *
- * A token consists of only ASCII printable characters.
- * Non printable characters in a token is represented in \ooo style
- * octal string. Thus, \ itself is represented as \\.
+ * tomoyo_name_entry is a structure which is used for linking
+ * "struct tomoyo_path_info" into tomoyo_name_list .
  */
-#define TOMOYO_MAX_PATHNAME_LEN 4000
+struct tomoyo_name_entry {
+	struct list_head list;
+	atomic_t users;
+	struct tomoyo_path_info entry;
+};
 
 /*
  * tomoyo_path_info_with_data is a structure which is used for holding a
@@ -89,7 +197,7 @@ struct tomoyo_path_info {
  * "struct tomoyo_path_info_with_data".
  */
 struct tomoyo_path_info_with_data {
-	/* Keep "head" first, for this pointer is passed to tomoyo_free(). */
+	/* Keep "head" first, for this pointer is passed to kfree(). */
 	struct tomoyo_path_info head;
 	char barrier1[16]; /* Safeguard for overrun. */
 	char body[TOMOYO_MAX_PATHNAME_LEN];
@@ -101,30 +209,19 @@ struct tomoyo_path_info_with_data {
  *
  *  (1) "list" which is linked to the ->acl_info_list of
  *      "struct tomoyo_domain_info"
- *  (2) "type" which tells
- *      (a) type & 0x7F : type of the entry (either
- *          "struct tomoyo_single_path_acl_record" or
- *          "struct tomoyo_double_path_acl_record")
- *      (b) type & 0x80 : whether the entry is marked as "deleted".
+ *  (2) "type" which tells type of the entry (either
+ *      "struct tomoyo_path_acl" or "struct tomoyo_path2_acl").
  *
  * Packing "struct tomoyo_acl_info" allows
- * "struct tomoyo_single_path_acl_record" to embed "u16" and
- * "struct tomoyo_double_path_acl_record" to embed "u8"
+ * "struct tomoyo_path_acl" to embed "u8" + "u16" and
+ * "struct tomoyo_path2_acl" to embed "u8"
  * without enlarging their structure size.
  */
 struct tomoyo_acl_info {
 	struct list_head list;
-	/*
-	 * Type of this ACL entry.
-	 *
-	 * MSB is is_deleted flag.
-	 */
 	u8 type;
 } __packed;
 
-/* This ACL entry is deleted.           */
-#define TOMOYO_ACL_DELETED        0x80
-
 /*
  * tomoyo_domain_info is a structure which is used for holding permissions
  * (e.g. "allow_read /lib/libc-2.5.so") given to each domain.
@@ -138,7 +235,17 @@ struct tomoyo_acl_info {
  *      "deleted", false otherwise.
  *  (6) "quota_warned" is a bool which is used for suppressing warning message
  *      when learning mode learned too much entries.
- *  (7) "flags" which remembers this domain's attributes.
+ *  (7) "ignore_global_allow_read" is a bool which is true if this domain
+ *      should ignore "allow_read" directive in exception policy.
+ *  (8) "transition_failed" is a bool which is set to true when this domain was
+ *      unable to create a new domain at tomoyo_find_next_domain() because the
+ *      name of the domain to be created was too long or it could not allocate
+ *      memory. If set to true, more than one process continued execve()
+ *      without domain transition.
+ *  (9) "users" is an atomic_t that holds how many "struct cred"->security
+ *      are referring this "struct tomoyo_domain_info". If is_deleted == true
+ *      and users == 0, this struct will be kfree()d upon next garbage
+ *      collection.
  *
  * A domain's lifecycle is an analogy of files on / directory.
  * Multiple domains with the same domainname cannot be created (as with
@@ -155,25 +262,13 @@ struct tomoyo_domain_info {
 	u8 profile;        /* Profile number to use. */
 	bool is_deleted;   /* Delete flag.           */
 	bool quota_warned; /* Quota warnning flag.   */
-	/* DOMAIN_FLAGS_*. Use tomoyo_set_domain_flag() to modify. */
-	u8 flags;
+	bool ignore_global_allow_read; /* Ignore "allow_read" flag. */
+	bool transition_failed; /* Domain transition failed flag. */
+	atomic_t users; /* Number of referring credentials. */
 };
 
-/* Profile number is an integer between 0 and 255. */
-#define TOMOYO_MAX_PROFILES 256
-
-/* Ignore "allow_read" directive in exception policy. */
-#define TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ 1
-/*
- * This domain was unable to create a new domain at tomoyo_find_next_domain()
- * because the name of the domain to be created was too long or
- * it could not allocate memory.
- * More than one process continued execve() without domain transition.
- */
-#define TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED        2
-
 /*
- * tomoyo_single_path_acl_record is a structure which is used for holding an
+ * tomoyo_path_acl is a structure which is used for holding an
  * entry with one pathname operation (e.g. open(), mkdir()).
  * It has following fields.
  *
@@ -184,18 +279,21 @@ struct tomoyo_domain_info {
  * Directives held by this structure are "allow_read/write", "allow_execute",
  * "allow_read", "allow_write", "allow_create", "allow_unlink", "allow_mkdir",
  * "allow_rmdir", "allow_mkfifo", "allow_mksock", "allow_mkblock",
- * "allow_mkchar", "allow_truncate", "allow_symlink" and "allow_rewrite".
+ * "allow_mkchar", "allow_truncate", "allow_symlink", "allow_rewrite",
+ * "allow_chmod", "allow_chown", "allow_chgrp", "allow_chroot", "allow_mount"
+ * and "allow_unmount".
  */
-struct tomoyo_single_path_acl_record {
-	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_SINGLE_PATH_ACL */
+struct tomoyo_path_acl {
+	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_ACL */
+	u8 perm_high;
 	u16 perm;
 	/* Pointer to single pathname. */
 	const struct tomoyo_path_info *filename;
 };
 
 /*
- * tomoyo_double_path_acl_record is a structure which is used for holding an
- * entry with two pathnames operation (i.e. link() and rename()).
+ * tomoyo_path2_acl is a structure which is used for holding an
+ * entry with two pathnames operation (i.e. link(), rename() and pivot_root()).
  * It has following fields.
  *
  *  (1) "head" which is a "struct tomoyo_acl_info".
@@ -203,10 +301,11 @@ struct tomoyo_single_path_acl_record {
  *  (3) "filename1" is the source/old pathname.
  *  (4) "filename2" is the destination/new pathname.
  *
- * Directives held by this structure are "allow_rename" and "allow_link".
+ * Directives held by this structure are "allow_rename", "allow_link" and
+ * "allow_pivot_root".
  */
-struct tomoyo_double_path_acl_record {
-	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_DOUBLE_PATH_ACL */
+struct tomoyo_path2_acl {
+	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH2_ACL */
 	u8 perm;
 	/* Pointer to single pathname. */
 	const struct tomoyo_path_info *filename1;
@@ -214,29 +313,6 @@ struct tomoyo_double_path_acl_record {
 	const struct tomoyo_path_info *filename2;
 };
 
-/* Keywords for ACLs. */
-#define TOMOYO_KEYWORD_ALIAS                     "alias "
-#define TOMOYO_KEYWORD_ALLOW_READ                "allow_read "
-#define TOMOYO_KEYWORD_DELETE                    "delete "
-#define TOMOYO_KEYWORD_DENY_REWRITE              "deny_rewrite "
-#define TOMOYO_KEYWORD_FILE_PATTERN              "file_pattern "
-#define TOMOYO_KEYWORD_INITIALIZE_DOMAIN         "initialize_domain "
-#define TOMOYO_KEYWORD_KEEP_DOMAIN               "keep_domain "
-#define TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN      "no_initialize_domain "
-#define TOMOYO_KEYWORD_NO_KEEP_DOMAIN            "no_keep_domain "
-#define TOMOYO_KEYWORD_SELECT                    "select "
-#define TOMOYO_KEYWORD_USE_PROFILE               "use_profile "
-#define TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ  "ignore_global_allow_read"
-/* A domain definition starts with <kernel>. */
-#define TOMOYO_ROOT_NAME                         "<kernel>"
-#define TOMOYO_ROOT_NAME_LEN                     (sizeof(TOMOYO_ROOT_NAME) - 1)
-
-/* Index numbers for Access Controls. */
-#define TOMOYO_MAC_FOR_FILE                  0  /* domain_policy.conf */
-#define TOMOYO_MAX_ACCEPT_ENTRY              1
-#define TOMOYO_VERBOSE                       2
-#define TOMOYO_MAX_CONTROL_INDEX             3
-
 /*
  * tomoyo_io_buffer is a structure which is used for reading and modifying
  * configuration via /sys/kernel/security/tomoyo/ interface.
@@ -265,6 +341,8 @@ struct tomoyo_io_buffer {
 	int (*write) (struct tomoyo_io_buffer *);
 	/* Exclusive lock for this structure.   */
 	struct mutex io_sem;
+	/* Index returned by tomoyo_read_lock(). */
+	int reader_idx;
 	/* The position currently reading from. */
 	struct list_head *read_var1;
 	/* Extra variables for reading.         */
@@ -293,18 +371,159 @@ struct tomoyo_io_buffer {
 	int writebuf_size;
 };
 
+/*
+ * tomoyo_globally_readable_file_entry is a structure which is used for holding
+ * "allow_read" entries.
+ * It has following fields.
+ *
+ *  (1) "list" which is linked to tomoyo_globally_readable_list .
+ *  (2) "filename" is a pathname which is allowed to open(O_RDONLY).
+ *  (3) "is_deleted" is a bool which is true if marked as deleted, false
+ *      otherwise.
+ */
+struct tomoyo_globally_readable_file_entry {
+	struct list_head list;
+	const struct tomoyo_path_info *filename;
+	bool is_deleted;
+};
+
+/*
+ * tomoyo_pattern_entry is a structure which is used for holding
+ * "tomoyo_pattern_list" entries.
+ * It has following fields.
+ *
+ *  (1) "list" which is linked to tomoyo_pattern_list .
+ *  (2) "pattern" is a pathname pattern which is used for converting pathnames
+ *      to pathname patterns during learning mode.
+ *  (3) "is_deleted" is a bool which is true if marked as deleted, false
+ *      otherwise.
+ */
+struct tomoyo_pattern_entry {
+	struct list_head list;
+	const struct tomoyo_path_info *pattern;
+	bool is_deleted;
+};
+
+/*
+ * tomoyo_no_rewrite_entry is a structure which is used for holding
+ * "deny_rewrite" entries.
+ * It has following fields.
+ *
+ *  (1) "list" which is linked to tomoyo_no_rewrite_list .
+ *  (2) "pattern" is a pathname which is by default not permitted to modify
+ *      already existing content.
+ *  (3) "is_deleted" is a bool which is true if marked as deleted, false
+ *      otherwise.
+ */
+struct tomoyo_no_rewrite_entry {
+	struct list_head list;
+	const struct tomoyo_path_info *pattern;
+	bool is_deleted;
+};
+
+/*
+ * tomoyo_domain_initializer_entry is a structure which is used for holding
+ * "initialize_domain" and "no_initialize_domain" entries.
+ * It has following fields.
+ *
+ *  (1) "list" which is linked to tomoyo_domain_initializer_list .
+ *  (2) "domainname" which is "a domainname" or "the last component of a
+ *      domainname". This field is NULL if "from" clause is not specified.
+ *  (3) "program" which is a program's pathname.
+ *  (4) "is_deleted" is a bool which is true if marked as deleted, false
+ *      otherwise.
+ *  (5) "is_not" is a bool which is true if "no_initialize_domain", false
+ *      otherwise.
+ *  (6) "is_last_name" is a bool which is true if "domainname" is "the last
+ *      component of a domainname", false otherwise.
+ */
+struct tomoyo_domain_initializer_entry {
+	struct list_head list;
+	const struct tomoyo_path_info *domainname;    /* This may be NULL */
+	const struct tomoyo_path_info *program;
+	bool is_deleted;
+	bool is_not;       /* True if this entry is "no_initialize_domain".  */
+	/* True if the domainname is tomoyo_get_last_name(). */
+	bool is_last_name;
+};
+
+/*
+ * tomoyo_domain_keeper_entry is a structure which is used for holding
+ * "keep_domain" and "no_keep_domain" entries.
+ * It has following fields.
+ *
+ *  (1) "list" which is linked to tomoyo_domain_keeper_list .
+ *  (2) "domainname" which is "a domainname" or "the last component of a
+ *      domainname".
+ *  (3) "program" which is a program's pathname.
+ *      This field is NULL if "from" clause is not specified.
+ *  (4) "is_deleted" is a bool which is true if marked as deleted, false
+ *      otherwise.
+ *  (5) "is_not" is a bool which is true if "no_initialize_domain", false
+ *      otherwise.
+ *  (6) "is_last_name" is a bool which is true if "domainname" is "the last
+ *      component of a domainname", false otherwise.
+ */
+struct tomoyo_domain_keeper_entry {
+	struct list_head list;
+	const struct tomoyo_path_info *domainname;
+	const struct tomoyo_path_info *program;       /* This may be NULL */
+	bool is_deleted;
+	bool is_not;       /* True if this entry is "no_keep_domain".        */
+	/* True if the domainname is tomoyo_get_last_name(). */
+	bool is_last_name;
+};
+
+/*
+ * tomoyo_alias_entry is a structure which is used for holding "alias" entries.
+ * It has following fields.
+ *
+ *  (1) "list" which is linked to tomoyo_alias_list .
+ *  (2) "original_name" which is a dereferenced pathname.
+ *  (3) "aliased_name" which is a symlink's pathname.
+ *  (4) "is_deleted" is a bool which is true if marked as deleted, false
+ *      otherwise.
+ */
+struct tomoyo_alias_entry {
+	struct list_head list;
+	const struct tomoyo_path_info *original_name;
+	const struct tomoyo_path_info *aliased_name;
+	bool is_deleted;
+};
+
+/*
+ * tomoyo_policy_manager_entry is a structure which is used for holding list of
+ * domainnames or programs which are permitted to modify configuration via
+ * /sys/kernel/security/tomoyo/ interface.
+ * It has following fields.
+ *
+ *  (1) "list" which is linked to tomoyo_policy_manager_list .
+ *  (2) "manager" is a domainname or a program's pathname.
+ *  (3) "is_domain" is a bool which is true if "manager" is a domainname, false
+ *      otherwise.
+ *  (4) "is_deleted" is a bool which is true if marked as deleted, false
+ *      otherwise.
+ */
+struct tomoyo_policy_manager_entry {
+	struct list_head list;
+	/* A path to program or a domainname. */
+	const struct tomoyo_path_info *manager;
+	bool is_domain;  /* True if manager is a domainname. */
+	bool is_deleted; /* True if this entry is deleted. */
+};
+
+/********** Function prototypes. **********/
+
 /* Check whether the domain has too many ACL entries to hold. */
 bool tomoyo_domain_quota_is_ok(struct tomoyo_domain_info * const domain);
 /* Transactional sprintf() for policy dump. */
 bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
 	__attribute__ ((format(printf, 2, 3)));
 /* Check whether the domainname is correct. */
-bool tomoyo_is_correct_domain(const unsigned char *domainname,
-			      const char *function);
+bool tomoyo_is_correct_domain(const unsigned char *domainname);
 /* Check whether the token is correct. */
 bool tomoyo_is_correct_path(const char *filename, const s8 start_type,
-			    const s8 pattern_type, const s8 end_type,
-			    const char *function);
+			    const s8 pattern_type, const s8 end_type);
 /* Check whether the token can be a domainname. */
 bool tomoyo_is_domain_def(const unsigned char *buffer);
 /* Check whether the given filename matches the given pattern. */
@@ -328,13 +547,13 @@ bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head);
 /* Write domain policy violation warning message to console? */
 bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain);
 /* Convert double path operation to operation name. */
-const char *tomoyo_dp2keyword(const u8 operation);
+const char *tomoyo_path22keyword(const u8 operation);
 /* Get the last component of the given domainname. */
 const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain);
 /* Get warning message. */
 const char *tomoyo_get_msg(const bool is_enforce);
 /* Convert single path operation to operation name. */
-const char *tomoyo_sp2keyword(const u8 operation);
+const char *tomoyo_path2keyword(const u8 operation);
 /* Create "alias" entry in exception policy. */
 int tomoyo_write_alias_policy(char *data, const bool is_delete);
 /*
@@ -370,33 +589,107 @@ struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char *
 /* Check mode for specified functionality. */
 unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
 				const u8 index);
-/* Allocate memory for structures. */
-void *tomoyo_alloc_acl_element(const u8 acl_type);
 /* Fill in "struct tomoyo_path_info" members. */
 void tomoyo_fill_path_info(struct tomoyo_path_info *ptr);
 /* Run policy loader when /sbin/init starts. */
 void tomoyo_load_policy(const char *filename);
-/* Change "struct tomoyo_domain_info"->flags. */
-void tomoyo_set_domain_flag(struct tomoyo_domain_info *domain,
-			    const bool is_delete, const u8 flags);
 
-/* strcmp() for "struct tomoyo_path_info" structure. */
-static inline bool tomoyo_pathcmp(const struct tomoyo_path_info *a,
-				  const struct tomoyo_path_info *b)
+/* Convert binary string to ascii string. */
+int tomoyo_encode(char *buffer, int buflen, const char *str);
+
+/* Returns realpath(3) of the given pathname but ignores chroot'ed root. */
+int tomoyo_realpath_from_path2(struct path *path, char *newname,
+			       int newname_len);
+
+/*
+ * Returns realpath(3) of the given pathname but ignores chroot'ed root.
+ * These functions use kzalloc(), so the caller must call kfree()
+ * if these functions didn't return NULL.
+ */
+char *tomoyo_realpath(const char *pathname);
+/*
+ * Same with tomoyo_realpath() except that it doesn't follow the final symlink.
+ */
+char *tomoyo_realpath_nofollow(const char *pathname);
+/* Same with tomoyo_realpath() except that the pathname is already solved. */
+char *tomoyo_realpath_from_path(struct path *path);
+
+/* Check memory quota. */
+bool tomoyo_memory_ok(void *ptr);
+
+/*
+ * Keep the given name on the RAM.
+ * The RAM is shared, so NEVER try to modify or kfree() the returned name.
+ */
+const struct tomoyo_path_info *tomoyo_get_name(const char *name);
+
+/* Check for memory usage. */
+int tomoyo_read_memory_counter(struct tomoyo_io_buffer *head);
+
+/* Set memory quota. */
+int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head);
+
+/* Initialize realpath related code. */
+void __init tomoyo_realpath_init(void);
+int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain,
+			   const struct tomoyo_path_info *filename);
+int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
+				 struct path *path, const int flag);
+int tomoyo_path_perm(const u8 operation, struct path *path);
+int tomoyo_path2_perm(const u8 operation, struct path *path1,
+		      struct path *path2);
+int tomoyo_check_rewrite_permission(struct file *filp);
+int tomoyo_find_next_domain(struct linux_binprm *bprm);
+
+/* Run garbage collector. */
+void tomoyo_run_gc(void);
+
+void tomoyo_memory_free(void *ptr);
+
+/********** External variable definitions. **********/
+
+/* Lock for GC. */
+extern struct srcu_struct tomoyo_ss;
+
+/* The list for "struct tomoyo_domain_info". */
+extern struct list_head tomoyo_domain_list;
+
+extern struct list_head tomoyo_domain_initializer_list;
+extern struct list_head tomoyo_domain_keeper_list;
+extern struct list_head tomoyo_alias_list;
+extern struct list_head tomoyo_globally_readable_list;
+extern struct list_head tomoyo_pattern_list;
+extern struct list_head tomoyo_no_rewrite_list;
+extern struct list_head tomoyo_policy_manager_list;
+extern struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];
+extern struct mutex tomoyo_name_list_lock;
+
+/* Lock for protecting policy. */
+extern struct mutex tomoyo_policy_lock;
+
+/* Has /sbin/init started? */
+extern bool tomoyo_policy_loaded;
+
+/* The kernel's domain. */
+extern struct tomoyo_domain_info tomoyo_kernel_domain;
+
+/********** Inlined functions. **********/
+
+static inline int tomoyo_read_lock(void)
 {
-	return a->hash != b->hash || strcmp(a->name, b->name);
+	return srcu_read_lock(&tomoyo_ss);
 }
 
-/* Get type of an ACL entry. */
-static inline u8 tomoyo_acl_type1(struct tomoyo_acl_info *ptr)
+static inline void tomoyo_read_unlock(int idx)
 {
-	return ptr->type & ~TOMOYO_ACL_DELETED;
+	srcu_read_unlock(&tomoyo_ss, idx);
 }
 
-/* Get type of an ACL entry. */
-static inline u8 tomoyo_acl_type2(struct tomoyo_acl_info *ptr)
+/* strcmp() for "struct tomoyo_path_info" structure. */
+static inline bool tomoyo_pathcmp(const struct tomoyo_path_info *a,
+				  const struct tomoyo_path_info *b)
 {
-	return ptr->type;
+	return a->hash != b->hash || strcmp(a->name, b->name);
 }
 
 /**
@@ -423,18 +716,25 @@ static inline bool tomoyo_is_invalid(const unsigned char c)
 	return c && (c <= ' ' || c >= 127);
 }
 
-/* The list for "struct tomoyo_domain_info". */
-extern struct list_head tomoyo_domain_list;
-extern struct rw_semaphore tomoyo_domain_list_lock;
-
-/* Lock for domain->acl_info_list. */
-extern struct rw_semaphore tomoyo_domain_acl_info_list_lock;
+static inline void tomoyo_put_name(const struct tomoyo_path_info *name)
+{
+	if (name) {
+		struct tomoyo_name_entry *ptr =
+			container_of(name, struct tomoyo_name_entry, entry);
+		atomic_dec(&ptr->users);
+	}
+}
 
-/* Has /sbin/init started? */
-extern bool tomoyo_policy_loaded;
+static inline struct tomoyo_domain_info *tomoyo_domain(void)
+{
+	return current_cred()->security;
+}
 
-/* The kernel's domain. */
-extern struct tomoyo_domain_info tomoyo_kernel_domain;
+static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct
+							    *task)
+{
+	return task_cred_xxx(task, security);
+}
 
 /**
  * list_for_each_cookie - iterate over a list with cookie.
@@ -442,16 +742,16 @@ extern struct tomoyo_domain_info tomoyo_kernel_domain;
  * @cookie:     the &struct list_head to use as a cookie.
  * @head:       the head for your list.
  *
- * Same with list_for_each() except that this primitive uses @cookie
+ * Same with list_for_each_rcu() except that this primitive uses @cookie
  * so that we can continue iteration.
  * @cookie must be NULL when iteration starts, and @cookie will become
  * NULL when iteration finishes.
  */
-#define list_for_each_cookie(pos, cookie, head)                       \
-	for (({ if (!cookie)                                          \
-				     cookie = head; }),               \
-	     pos = (cookie)->next;                                    \
-	     prefetch(pos->next), pos != (head) || ((cookie) = NULL); \
-	     (cookie) = pos, pos = pos->next)
+#define list_for_each_cookie(pos, cookie, head)				\
+	for (({ if (!cookie)						\
+				     cookie = head; }),			\
+		     pos = rcu_dereference((cookie)->next);		\
+	     prefetch(pos->next), pos != (head) || ((cookie) = NULL);	\
+	     (cookie) = pos, pos = rcu_dereference(pos->next))
 
 #endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */