TOMOYO: Add policy namespace support.

Mauras Olivier reported that it is difficult to use TOMOYO in LXC environments,
for TOMOYO cannot distinguish between environments outside the container and
environments inside the container since LXC environments are created using
pivot_root(). To address this problem, this patch introduces policy namespace.

Each policy namespace has its own set of domain policy, exception policy and
profiles, which are all independent of other namespaces. This independency
allows users to develop policy without worrying interference among namespaces.
Signed-off-by: NTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: NJames Morris <jmorris@namei.org>

security/tomoyo/audit.c

@@ -151,13 +151,15 @@ static unsigned int tomoyo_log_count;
 /**
  * tomoyo_get_audit - Get audit mode.
  *
+ * @ns:          Pointer to "struct tomoyo_policy_namespace".
  * @profile:     Profile number.
  * @index:       Index number of functionality.
  * @is_granted:  True if granted log, false otherwise.
  *
  * Returns true if this request should be audited, false otherwise.
  */
-static bool tomoyo_get_audit(const u8 profile, const u8 index,
+static bool tomoyo_get_audit(const struct tomoyo_policy_namespace *ns,
+			     const u8 profile, const u8 index,
 			     const bool is_granted)
 {
 	u8 mode;
@@ -165,7 +167,7 @@ static bool tomoyo_get_audit(const u8 profile, const u8 index,
 	struct tomoyo_profile *p;
 	if (!tomoyo_policy_loaded)
 		return false;
-	p = tomoyo_profile(profile);
+	p = tomoyo_profile(ns, profile);
 	if (tomoyo_log_count >= p->pref[TOMOYO_PREF_MAX_AUDIT_LOG])
 		return false;
 	mode = p->config[index];
@@ -194,7 +196,7 @@ void tomoyo_write_log2(struct tomoyo_request_info *r, int len, const char *fmt,
 	char *buf;
 	struct tomoyo_log *entry;
 	bool quota_exceeded = false;
-	if (!tomoyo_get_audit(r->profile, r->type, r->granted))
+	if (!tomoyo_get_audit(r->domain->ns, r->profile, r->type, r->granted))
 		goto out;
 	buf = tomoyo_init_log(r, len, fmt, args);
 	if (!buf)

security/tomoyo/common.h

@@ -74,10 +74,6 @@ enum tomoyo_group_id {
 	TOMOYO_MAX_GROUP
 };
 
-/* A domain definition starts with <kernel>. */
-#define TOMOYO_ROOT_NAME                         "<kernel>"
-#define TOMOYO_ROOT_NAME_LEN                     (sizeof(TOMOYO_ROOT_NAME) - 1)
-
 /* Index numbers for type of numeric values. */
 enum tomoyo_value_type {
 	TOMOYO_VALUE_TYPE_INVALID,
@@ -89,6 +85,8 @@ enum tomoyo_value_type {
 /* Index numbers for domain transition control keywords. */
 enum tomoyo_transition_type {
 	/* Do not change this order, */
+	TOMOYO_TRANSITION_CONTROL_NO_RESET,
+	TOMOYO_TRANSITION_CONTROL_RESET,
 	TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE,
 	TOMOYO_TRANSITION_CONTROL_INITIALIZE,
 	TOMOYO_TRANSITION_CONTROL_NO_KEEP,
@@ -246,6 +244,8 @@ struct tomoyo_shared_acl_head {
 	atomic_t users;
 } __packed;
 
+struct tomoyo_policy_namespace;
+
 /* Structure for request info. */
 struct tomoyo_request_info {
 	struct tomoyo_domain_info *domain;
@@ -359,6 +359,8 @@ struct tomoyo_domain_info {
 	struct list_head acl_info_list;
 	/* Name of this domain. Never NULL.          */
 	const struct tomoyo_path_info *domainname;
+	/* Namespace for this domain. Never NULL. */
+	struct tomoyo_policy_namespace *ns;
 	u8 profile;        /* Profile number to use. */
 	u8 group;          /* Group number to use.   */
 	bool is_deleted;   /* Delete flag.           */
@@ -423,6 +425,7 @@ struct tomoyo_mount_acl {
 struct tomoyo_acl_param {
 	char *data;
 	struct list_head *list;
+	struct tomoyo_policy_namespace *ns;
 	bool is_delete;
 };
 
@@ -443,6 +446,7 @@ struct tomoyo_io_buffer {
 	char __user *read_user_buf;
 	int read_user_buf_avail;
 	struct {
+		struct list_head *ns;
 		struct list_head *domain;
 		struct list_head *group;
 		struct list_head *acl;
@@ -455,14 +459,16 @@ struct tomoyo_io_buffer {
 		u8 w_pos;
 		bool eof;
 		bool print_this_domain_only;
-		bool print_execute_only;
+		bool print_transition_related_only;
 		const char *w[TOMOYO_MAX_IO_READ_QUEUE];
 	} r;
 	struct {
+		struct tomoyo_policy_namespace *ns;
 		/* The position currently writing to.   */
 		struct tomoyo_domain_info *domain;
 		/* Bytes available for writing.         */
 		int avail;
+		bool is_delete;
 	} w;
 	/* Buffer for reading.                  */
 	char *read_buf;
@@ -533,8 +539,27 @@ struct tomoyo_time {
 	u8 sec;
 };
 
+/* Structure for policy namespace. */
+struct tomoyo_policy_namespace {
+	/* Profile table. Memory is allocated as needed. */
+	struct tomoyo_profile *profile_ptr[TOMOYO_MAX_PROFILES];
+	/* List of "struct tomoyo_group". */
+	struct list_head group_list[TOMOYO_MAX_GROUP];
+	/* List of policy. */
+	struct list_head policy_list[TOMOYO_MAX_POLICY];
+	/* The global ACL referred by "use_group" keyword. */
+	struct list_head acl_group[TOMOYO_MAX_ACL_GROUPS];
+	/* List for connecting to tomoyo_namespace_list list. */
+	struct list_head namespace_list;
+	/* Profile version. Currently only 20100903 is defined. */
+	unsigned int profile_version;
+	/* Name of this namespace (e.g. "<kernel>", "</usr/sbin/httpd>" ). */
+	const char *name;
+};
+
 /********** Function prototypes. **********/
 
+void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns);
 bool tomoyo_str_starts(char **src, const char *find);
 const char *tomoyo_get_exe(void);
 void tomoyo_normalize_line(unsigned char *buffer);
@@ -553,7 +578,8 @@ tomoyo_compare_name_union(const struct tomoyo_path_info *name,
 			  const struct tomoyo_name_union *ptr);
 bool tomoyo_compare_number_union(const unsigned long value,
 				 const struct tomoyo_number_union *ptr);
-int tomoyo_get_mode(const u8 profile, const u8 index);
+int tomoyo_get_mode(const struct tomoyo_policy_namespace *ns, const u8 profile,
+		    const u8 index);
 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
 	__attribute__ ((format(printf, 2, 3)));
 bool tomoyo_correct_domain(const unsigned char *domainname);
@@ -589,8 +615,11 @@ int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
      __attribute__ ((format(printf, 2, 3)));
 struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname);
 struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
-						const u8 profile);
-struct tomoyo_profile *tomoyo_profile(const u8 profile);
+						const bool transit);
+struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
+				      const u8 profile);
+struct tomoyo_policy_namespace *tomoyo_assign_namespace
+(const char *domainname);
 struct tomoyo_group *tomoyo_get_group(struct tomoyo_acl_param *param,
 				      const u8 idx);
 unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
@@ -646,6 +675,8 @@ char *tomoyo_read_token(struct tomoyo_acl_param *param);
 bool tomoyo_permstr(const char *string, const char *keyword);
 
 const char *tomoyo_yesno(const unsigned int value);
+void tomoyo_write_log(struct tomoyo_request_info *r, const char *fmt, ...)
+	__attribute__ ((format(printf, 2, 3)));
 void tomoyo_write_log2(struct tomoyo_request_info *r, int len, const char *fmt,
 		       va_list args);
 void tomoyo_read_log(struct tomoyo_io_buffer *head);
@@ -661,8 +692,6 @@ 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_policy_list[TOMOYO_MAX_POLICY];
-extern struct list_head tomoyo_group_list[TOMOYO_MAX_GROUP];
 extern struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];
 
 /* Lock for protecting policy. */
@@ -671,10 +700,10 @@ extern struct mutex tomoyo_policy_lock;
 /* Has /sbin/init started? */
 extern bool tomoyo_policy_loaded;
 
-extern struct list_head tomoyo_acl_group[TOMOYO_MAX_ACL_GROUPS];
-
 /* The kernel's domain. */
 extern struct tomoyo_domain_info tomoyo_kernel_domain;
+extern struct tomoyo_policy_namespace tomoyo_kernel_namespace;
+extern struct list_head tomoyo_namespace_list;
 
 extern const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION];
 extern const char *tomoyo_mkdev_keyword[TOMOYO_MAX_MKDEV_OPERATION];
@@ -809,6 +838,16 @@ static inline bool tomoyo_same_number_union
 		a->value_type[1] == b->value_type[1];
 }
 
+/**
+ * tomoyo_current_namespace - Get "struct tomoyo_policy_namespace" for current thread.
+ *
+ * Returns pointer to "struct tomoyo_policy_namespace" for current thread.
+ */
+static inline struct tomoyo_policy_namespace *tomoyo_current_namespace(void)
+{
+	return tomoyo_domain()->ns;
+}
+
 #if defined(CONFIG_SLOB)
 
 /**

security/tomoyo/domain.c

@@ -12,9 +12,6 @@
 
 /* Variables definitions.*/
 
-/* The global ACL referred by "use_group" keyword. */
-struct list_head tomoyo_acl_group[TOMOYO_MAX_ACL_GROUPS];
-
 /* The initial domain. */
 struct tomoyo_domain_info tomoyo_kernel_domain;
 
@@ -158,7 +155,7 @@ void tomoyo_check_acl(struct tomoyo_request_info *r,
 	}
 	if (!retried) {
 		retried = true;
-		list = &tomoyo_acl_group[domain->group];
+		list = &domain->ns->acl_group[domain->group];
 		goto retry;
 	}
 	r->granted = false;
@@ -167,13 +164,10 @@ void tomoyo_check_acl(struct tomoyo_request_info *r,
 /* The list for "struct tomoyo_domain_info". */
 LIST_HEAD(tomoyo_domain_list);
 
-struct list_head tomoyo_policy_list[TOMOYO_MAX_POLICY];
-struct list_head tomoyo_group_list[TOMOYO_MAX_GROUP];
-
 /**
  * tomoyo_last_word - Get last component of a domainname.
  *
- * @domainname: Domainname to check.
+ * @name: Domainname to check.
  *
  * Returns the last word of @domainname.
  */
@@ -247,7 +241,7 @@ int tomoyo_write_transition_control(struct tomoyo_acl_param *param,
 		if (!e.domainname)
 			goto out;
 	}
-	param->list = &tomoyo_policy_list[TOMOYO_ID_TRANSITION_CONTROL];
+	param->list = &param->ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL];
 	error = tomoyo_update_policy(&e.head, sizeof(e), param,
 				     tomoyo_same_transition_control);
 out:
@@ -257,59 +251,88 @@ int tomoyo_write_transition_control(struct tomoyo_acl_param *param,
 }
 
 /**
- * tomoyo_transition_type - Get domain transition type.
+ * tomoyo_scan_transition - Try to find specific domain transition type.
  *
- * @domainname: The name of domain.
- * @program:    The name of program.
+ * @list:       Pointer to "struct list_head".
+ * @domainname: The name of current domain.
+ * @program:    The name of requested program.
+ * @last_name:  The last component of @domainname.
+ * @type:       One of values in "enum tomoyo_transition_type".
  *
- * Returns TOMOYO_TRANSITION_CONTROL_INITIALIZE if executing @program
- * reinitializes domain transition, TOMOYO_TRANSITION_CONTROL_KEEP if executing
- * @program suppresses domain transition, others otherwise.
+ * Returns true if found one, false otherwise.
  *
  * Caller holds tomoyo_read_lock().
  */
-static u8 tomoyo_transition_type(const struct tomoyo_path_info *domainname,
-				 const struct tomoyo_path_info *program)
+static inline bool tomoyo_scan_transition
+(const struct list_head *list, const struct tomoyo_path_info *domainname,
+ const struct tomoyo_path_info *program, const char *last_name,
+ const enum tomoyo_transition_type type)
 {
 	const struct tomoyo_transition_control *ptr;
-	const char *last_name = tomoyo_last_word(domainname->name);
-	u8 type;
-	for (type = 0; type < TOMOYO_MAX_TRANSITION_TYPE; type++) {
- next:
-		list_for_each_entry_rcu(ptr, &tomoyo_policy_list
-					[TOMOYO_ID_TRANSITION_CONTROL],
-					head.list) {
-			if (ptr->head.is_deleted || ptr->type != type)
-				continue;
-			if (ptr->domainname) {
-				if (!ptr->is_last_name) {
-					if (ptr->domainname != domainname)
-						continue;
-				} else {
-					/*
-					 * Use direct strcmp() since this is
-					 * unlikely used.
-					 */
-					if (strcmp(ptr->domainname->name,
-						   last_name))
-						continue;
-				}
-			}
-			if (ptr->program &&
-			    tomoyo_pathcmp(ptr->program, program))
-				continue;
-			if (type == TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE) {
+	list_for_each_entry_rcu(ptr, list, head.list) {
+		if (ptr->head.is_deleted || ptr->type != type)
+			continue;
+		if (ptr->domainname) {
+			if (!ptr->is_last_name) {
+				if (ptr->domainname != domainname)
+					continue;
+			} else {
 				/*
-				 * Do not check for initialize_domain if
-				 * no_initialize_domain matched.
+				 * Use direct strcmp() since this is
+				 * unlikely used.
 				 */
-				type = TOMOYO_TRANSITION_CONTROL_NO_KEEP;
-				goto next;
+				if (strcmp(ptr->domainname->name, last_name))
+					continue;
 			}
-			goto done;
 		}
+		if (ptr->program && tomoyo_pathcmp(ptr->program, program))
+			continue;
+		return true;
+	}
+	return false;
+}
+
+/**
+ * tomoyo_transition_type - Get domain transition type.
+ *
+ * @ns:         Pointer to "struct tomoyo_policy_namespace".
+ * @domainname: The name of current domain.
+ * @program:    The name of requested program.
+ *
+ * Returns TOMOYO_TRANSITION_CONTROL_TRANSIT if executing @program causes
+ * domain transition across namespaces, TOMOYO_TRANSITION_CONTROL_INITIALIZE if
+ * executing @program reinitializes domain transition within that namespace,
+ * TOMOYO_TRANSITION_CONTROL_KEEP if executing @program stays at @domainname ,
+ * others otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static enum tomoyo_transition_type tomoyo_transition_type
+(const struct tomoyo_policy_namespace *ns,
+ const struct tomoyo_path_info *domainname,
+ const struct tomoyo_path_info *program)
+{
+	const char *last_name = tomoyo_last_word(domainname->name);
+	enum tomoyo_transition_type type = TOMOYO_TRANSITION_CONTROL_NO_RESET;
+	while (type < TOMOYO_MAX_TRANSITION_TYPE) {
+		const struct list_head * const list =
+			&ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL];
+		if (!tomoyo_scan_transition(list, domainname, program,
+					    last_name, type)) {
+			type++;
+			continue;
+		}
+		if (type != TOMOYO_TRANSITION_CONTROL_NO_RESET &&
+		    type != TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE)
+			break;
+		/*
+		 * Do not check for reset_domain if no_reset_domain matched.
+		 * Do not check for initialize_domain if no_initialize_domain
+		 * matched.
+		 */
+		type++;
+		type++;
 	}
- done:
 	return type;
 }
 
@@ -355,7 +378,7 @@ int tomoyo_write_aggregator(struct tomoyo_acl_param *param)
 	if (!e.original_name || !e.aggregated_name ||
 	    e.aggregated_name->is_patterned) /* No patterns allowed. */
 		goto out;
-	param->list = &tomoyo_policy_list[TOMOYO_ID_AGGREGATOR];
+	param->list = &param->ns->policy_list[TOMOYO_ID_AGGREGATOR];
 	error = tomoyo_update_policy(&e.head, sizeof(e), param,
 				     tomoyo_same_aggregator);
 out:
@@ -365,53 +388,171 @@ int tomoyo_write_aggregator(struct tomoyo_acl_param *param)
 }
 
 /**
- * tomoyo_assign_domain - Create a domain.
+ * tomoyo_find_namespace - Find specified namespace.
  *
- * @domainname: The name of domain.
- * @profile:    Profile number to assign if the domain was newly created.
+ * @name: Name of namespace to find.
+ * @len:  Length of @name.
  *
- * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise.
+ * Returns pointer to "struct tomoyo_policy_namespace" if found,
+ * NULL otherwise.
  *
  * Caller holds tomoyo_read_lock().
  */
-struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
-						const u8 profile)
+static struct tomoyo_policy_namespace *tomoyo_find_namespace
+(const char *name, const unsigned int len)
 {
-	struct tomoyo_domain_info *entry;
-	struct tomoyo_domain_info *domain = NULL;
-	const struct tomoyo_path_info *saved_domainname;
-	bool found = false;
+	struct tomoyo_policy_namespace *ns;
+	list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) {
+		if (strncmp(name, ns->name, len) ||
+		    (name[len] && name[len] != ' '))
+			continue;
+		return ns;
+	}
+	return NULL;
+}
 
-	if (!tomoyo_correct_domain(domainname))
+/**
+ * tomoyo_assign_namespace - Create a new namespace.
+ *
+ * @domainname: Name of namespace to create.
+ *
+ * Returns pointer to "struct tomoyo_policy_namespace" on success,
+ * NULL otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+struct tomoyo_policy_namespace *tomoyo_assign_namespace(const char *domainname)
+{
+	struct tomoyo_policy_namespace *ptr;
+	struct tomoyo_policy_namespace *entry;
+	const char *cp = domainname;
+	unsigned int len = 0;
+	while (*cp && *cp++ != ' ')
+		len++;
+	ptr = tomoyo_find_namespace(domainname, len);
+	if (ptr)
+		return ptr;
+	if (len >= TOMOYO_EXEC_TMPSIZE - 10 || !tomoyo_domain_def(domainname))
 		return NULL;
-	saved_domainname = tomoyo_get_name(domainname);
-	if (!saved_domainname)
+	entry = kzalloc(sizeof(*entry) + len + 1, GFP_NOFS);
+	if (!entry)
 		return NULL;
-	entry = kzalloc(sizeof(*entry), GFP_NOFS);
 	if (mutex_lock_interruptible(&tomoyo_policy_lock))
 		goto out;
-	list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
-		if (domain->is_deleted ||
-		    tomoyo_pathcmp(saved_domainname, domain->domainname))
-			continue;
-		found = true;
-		break;
-	}
-	if (!found && tomoyo_memory_ok(entry)) {
-		INIT_LIST_HEAD(&entry->acl_info_list);
-		entry->domainname = saved_domainname;
-		saved_domainname = NULL;
-		entry->profile = profile;
-		list_add_tail_rcu(&entry->list, &tomoyo_domain_list);
-		domain = entry;
+	ptr = tomoyo_find_namespace(domainname, len);
+	if (!ptr && tomoyo_memory_ok(entry)) {
+		char *name = (char *) (entry + 1);
+		ptr = entry;
+		memmove(name, domainname, len);
+		name[len] = '\0';
+		entry->name = name;
+		tomoyo_init_policy_namespace(entry);
 		entry = NULL;
-		found = true;
 	}
 	mutex_unlock(&tomoyo_policy_lock);
- out:
-	tomoyo_put_name(saved_domainname);
+out:
 	kfree(entry);
-	return found ? domain : NULL;
+	return ptr;
+}
+
+/**
+ * tomoyo_namespace_jump - Check for namespace jump.
+ *
+ * @domainname: Name of domain.
+ *
+ * Returns true if namespace differs, false otherwise.
+ */
+static bool tomoyo_namespace_jump(const char *domainname)
+{
+	const char *namespace = tomoyo_current_namespace()->name;
+	const int len = strlen(namespace);
+	return strncmp(domainname, namespace, len) ||
+		(domainname[len] && domainname[len] != ' ');
+}
+
+/**
+ * tomoyo_assign_domain - Create a domain or a namespace.
+ *
+ * @domainname: The name of domain.
+ * @transit:    True if transit to domain found or created.
+ *
+ * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
+						const bool transit)
+{
+	struct tomoyo_domain_info e = { };
+	struct tomoyo_domain_info *entry = tomoyo_find_domain(domainname);
+	bool created = false;
+	if (entry) {
+		if (transit) {
+			/*
+			 * Since namespace is created at runtime, profiles may
+			 * not be created by the moment the process transits to
+			 * that domain. Do not perform domain transition if
+			 * profile for that domain is not yet created.
+			 */
+			if (!entry->ns->profile_ptr[entry->profile])
+				return NULL;
+		}
+		return entry;
+	}
+	/* Requested domain does not exist. */
+	/* Don't create requested domain if domainname is invalid. */
+	if (strlen(domainname) >= TOMOYO_EXEC_TMPSIZE - 10 ||
+	    !tomoyo_correct_domain(domainname))
+		return NULL;
+	/*
+	 * Since definition of profiles and acl_groups may differ across
+	 * namespaces, do not inherit "use_profile" and "use_group" settings
+	 * by automatically creating requested domain upon domain transition.
+	 */
+	if (transit && tomoyo_namespace_jump(domainname))
+		return NULL;
+	e.ns = tomoyo_assign_namespace(domainname);
+	if (!e.ns)
+		return NULL;
+	/*
+	 * "use_profile" and "use_group" settings for automatically created
+	 * domains are inherited from current domain. These are 0 for manually
+	 * created domains.
+	 */
+	if (transit) {
+		const struct tomoyo_domain_info *domain = tomoyo_domain();
+		e.profile = domain->profile;
+		e.group = domain->group;
+	}
+	e.domainname = tomoyo_get_name(domainname);
+	if (!e.domainname)
+		return NULL;
+	if (mutex_lock_interruptible(&tomoyo_policy_lock))
+		goto out;
+	entry = tomoyo_find_domain(domainname);
+	if (!entry) {
+		entry = tomoyo_commit_ok(&e, sizeof(e));
+		if (entry) {
+			INIT_LIST_HEAD(&entry->acl_info_list);
+			list_add_tail_rcu(&entry->list, &tomoyo_domain_list);
+			created = true;
+		}
+	}
+	mutex_unlock(&tomoyo_policy_lock);
+out:
+	tomoyo_put_name(e.domainname);
+	if (entry && transit) {
+		if (created) {
+			struct tomoyo_request_info r;
+			tomoyo_init_request_info(&r, entry,
+						 TOMOYO_MAC_FILE_EXECUTE);
+			r.granted = false;
+			tomoyo_write_log(&r, "use_profile %u\n",
+					 entry->profile);
+			tomoyo_write_log(&r, "use_group %u\n", entry->group);
+		}
+	}
+	return entry;
 }
 
 /**
@@ -434,6 +575,7 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
 	bool is_enforce;
 	int retval = -ENOMEM;
 	bool need_kfree = false;
+	bool reject_on_transition_failure = false;
 	struct tomoyo_path_info rn = { }; /* real name */
 
 	mode = tomoyo_init_request_info(&r, NULL, TOMOYO_MAC_FILE_EXECUTE);
@@ -457,8 +599,10 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
 	/* Check 'aggregator' directive. */
 	{
 		struct tomoyo_aggregator *ptr;
-		list_for_each_entry_rcu(ptr, &tomoyo_policy_list
-					[TOMOYO_ID_AGGREGATOR], head.list) {
+		struct list_head *list =
+			&old_domain->ns->policy_list[TOMOYO_ID_AGGREGATOR];
+		/* Check 'aggregator' directive. */
+		list_for_each_entry_rcu(ptr, list, head.list) {
 			if (ptr->head.is_deleted ||
 			    !tomoyo_path_matches_pattern(&rn,
 							 ptr->original_name))
@@ -492,11 +636,21 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
 	}
 
 	/* Calculate domain to transit to. */
-	switch (tomoyo_transition_type(old_domain->domainname, &rn)) {
+	switch (tomoyo_transition_type(old_domain->ns, old_domain->domainname,
+				       &rn)) {
+	case TOMOYO_TRANSITION_CONTROL_RESET:
+		/* Transit to the root of specified namespace. */
+		snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>", rn.name);
+		/*
+		 * Make do_execve() fail if domain transition across namespaces
+		 * has failed.
+		 */
+		reject_on_transition_failure = true;
+		break;
 	case TOMOYO_TRANSITION_CONTROL_INITIALIZE:
-		/* Transit to the child of tomoyo_kernel_domain domain. */
-		snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, TOMOYO_ROOT_NAME " "
-			 "%s", rn.name);
+		/* Transit to the child of current namespace's root. */
+		snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
+			 old_domain->ns->name, rn.name);
 		break;
 	case TOMOYO_TRANSITION_CONTROL_KEEP:
 		/* Keep current domain. */
@@ -519,19 +673,25 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
 		}
 		break;
 	}
-	if (domain || strlen(tmp) >= TOMOYO_EXEC_TMPSIZE - 10)
-		goto done;
-	domain = tomoyo_find_domain(tmp);
 	if (!domain)
-		domain = tomoyo_assign_domain(tmp, old_domain->profile);
- done:
+		domain = tomoyo_assign_domain(tmp, true);
 	if (domain)
-		goto out;
-	printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", tmp);
-	if (is_enforce)
-		retval = -EPERM;
-	else
-		old_domain->transition_failed = true;
+		retval = 0;
+	else if (reject_on_transition_failure) {
+		printk(KERN_WARNING "ERROR: Domain '%s' not ready.\n", tmp);
+		retval = -ENOMEM;
+	} else if (r.mode == TOMOYO_CONFIG_ENFORCING)
+		retval = -ENOMEM;
+	else {
+		retval = 0;
+		if (!old_domain->transition_failed) {
+			old_domain->transition_failed = true;
+			r.granted = false;
+			tomoyo_write_log(&r, "%s", "transition_failed\n");
+			printk(KERN_WARNING
+			       "ERROR: Domain '%s' not defined.\n", tmp);
+		}
+	}
  out:
 	if (!domain)
 		domain = old_domain;

security/tomoyo/file.c

@@ -603,7 +603,7 @@ int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
 	int error;
 
 	r->type = tomoyo_p2mac[operation];
-	r->mode = tomoyo_get_mode(r->profile, r->type);
+	r->mode = tomoyo_get_mode(r->domain->ns, r->profile, r->type);
 	if (r->mode == TOMOYO_CONFIG_DISABLED)
 		return 0;
 	r->param_type = TOMOYO_TYPE_PATH_ACL;

security/tomoyo/gc.c

@@ -292,15 +292,12 @@ static bool tomoyo_collect_acl(struct list_head *list)
 static void tomoyo_collect_entry(void)
 {
 	int i;
+	enum tomoyo_policy_id id;
+	struct tomoyo_policy_namespace *ns;
+	int idx;
 	if (mutex_lock_interruptible(&tomoyo_policy_lock))
 		return;
-	for (i = 0; i < TOMOYO_MAX_POLICY; i++) {
-		if (!tomoyo_collect_member(i, &tomoyo_policy_list[i]))
-			goto unlock;
-	}
-	for (i = 0; i < TOMOYO_MAX_ACL_GROUPS; i++)
-		if (!tomoyo_collect_acl(&tomoyo_acl_group[i]))
-			goto unlock;
+	idx = tomoyo_read_lock();
 	{
 		struct tomoyo_domain_info *domain;
 		list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
@@ -317,39 +314,49 @@ static void tomoyo_collect_entry(void)
 				goto unlock;
 		}
 	}
-	for (i = 0; i < TOMOYO_MAX_HASH; i++) {
-		struct tomoyo_name *ptr;
-		list_for_each_entry_rcu(ptr, &tomoyo_name_list[i], head.list) {
-			if (atomic_read(&ptr->head.users))
-				continue;
-			if (!tomoyo_add_to_gc(TOMOYO_ID_NAME, &ptr->head.list))
+	list_for_each_entry_rcu(ns, &tomoyo_namespace_list, namespace_list) {
+		for (id = 0; id < TOMOYO_MAX_POLICY; id++)
+			if (!tomoyo_collect_member(id, &ns->policy_list[id]))
 				goto unlock;
+		for (i = 0; i < TOMOYO_MAX_ACL_GROUPS; i++)
+			if (!tomoyo_collect_acl(&ns->acl_group[i]))
+				goto unlock;
+		for (i = 0; i < TOMOYO_MAX_GROUP; i++) {
+			struct list_head *list = &ns->group_list[i];
+			struct tomoyo_group *group;
+			switch (i) {
+			case 0:
+				id = TOMOYO_ID_PATH_GROUP;
+				break;
+			default:
+				id = TOMOYO_ID_NUMBER_GROUP;
+				break;
+			}
+			list_for_each_entry(group, list, head.list) {
+				if (!tomoyo_collect_member
+				    (id, &group->member_list))
+					goto unlock;
+				if (!list_empty(&group->member_list) ||
+				    atomic_read(&group->head.users))
+					continue;
+				if (!tomoyo_add_to_gc(TOMOYO_ID_GROUP,
+						      &group->head.list))
+					goto unlock;
+			}
 		}
 	}
-	for (i = 0; i < TOMOYO_MAX_GROUP; i++) {
-		struct list_head *list = &tomoyo_group_list[i];
-		int id;
-		struct tomoyo_group *group;
-		switch (i) {
-		case 0:
-			id = TOMOYO_ID_PATH_GROUP;
-			break;
-		default:
-			id = TOMOYO_ID_NUMBER_GROUP;
-			break;
-		}
-		list_for_each_entry(group, list, head.list) {
-			if (!tomoyo_collect_member(id, &group->member_list))
-				goto unlock;
-			if (!list_empty(&group->member_list) ||
-			    atomic_read(&group->head.users))
+	for (i = 0; i < TOMOYO_MAX_HASH; i++) {
+		struct list_head *list = &tomoyo_name_list[i];
+		struct tomoyo_shared_acl_head *ptr;
+		list_for_each_entry(ptr, list, list) {
+			if (atomic_read(&ptr->users))
 				continue;
-			if (!tomoyo_add_to_gc(TOMOYO_ID_GROUP,
-					      &group->head.list))
+			if (!tomoyo_add_to_gc(TOMOYO_ID_NAME, &ptr->list))
 				goto unlock;
 		}
 	}
- unlock:
+unlock:
+	tomoyo_read_unlock(idx);
 	mutex_unlock(&tomoyo_policy_lock);
 }
 

security/tomoyo/memory.c

@@ -118,7 +118,7 @@ struct tomoyo_group *tomoyo_get_group(struct tomoyo_acl_param *param,
 		return NULL;
 	if (mutex_lock_interruptible(&tomoyo_policy_lock))
 		goto out;
-	list = &tomoyo_group_list[idx];
+	list = &param->ns->group_list[idx];
 	list_for_each_entry(group, list, head.list) {
 		if (e.group_name != group->group_name)
 			continue;
@@ -199,27 +199,23 @@ const struct tomoyo_path_info *tomoyo_get_name(const char *name)
 	return ptr ? &ptr->entry : NULL;
 }
 
+/* Initial namespace.*/
+struct tomoyo_policy_namespace tomoyo_kernel_namespace;
+
 /**
  * tomoyo_mm_init - Initialize mm related code.
  */
 void __init tomoyo_mm_init(void)
 {
 	int idx;
-
-	for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
-		INIT_LIST_HEAD(&tomoyo_policy_list[idx]);
-	for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
-		INIT_LIST_HEAD(&tomoyo_group_list[idx]);
 	for (idx = 0; idx < TOMOYO_MAX_HASH; idx++)
 		INIT_LIST_HEAD(&tomoyo_name_list[idx]);
+	tomoyo_kernel_namespace.name = "<kernel>";
+	tomoyo_init_policy_namespace(&tomoyo_kernel_namespace);
+	tomoyo_kernel_domain.ns = &tomoyo_kernel_namespace;
 	INIT_LIST_HEAD(&tomoyo_kernel_domain.acl_info_list);
-	for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
-		INIT_LIST_HEAD(&tomoyo_acl_group[idx]);
-	tomoyo_kernel_domain.domainname = tomoyo_get_name(TOMOYO_ROOT_NAME);
+	tomoyo_kernel_domain.domainname = tomoyo_get_name("<kernel>");
 	list_add_tail_rcu(&tomoyo_kernel_domain.list, &tomoyo_domain_list);
-	idx = tomoyo_read_lock();
-	if (tomoyo_find_domain(TOMOYO_ROOT_NAME) != &tomoyo_kernel_domain)
-		panic("Can't register tomoyo_kernel_domain");
 #if 0
 	/* Will be replaced with tomoyo_load_builtin_policy(). */
 	{
@@ -230,7 +226,6 @@ void __init tomoyo_mm_init(void)
 					TOMOYO_TRANSITION_CONTROL_INITIALIZE);
 	}
 #endif
-	tomoyo_read_unlock(idx);
 }
 
 

security/tomoyo/util.c

@@ -416,26 +416,21 @@ bool tomoyo_correct_path(const char *filename)
  */
 bool tomoyo_correct_domain(const unsigned char *domainname)
 {
-	if (!domainname || strncmp(domainname, TOMOYO_ROOT_NAME,
-				   TOMOYO_ROOT_NAME_LEN))
-		goto out;
-	domainname += TOMOYO_ROOT_NAME_LEN;
-	if (!*domainname)
+	if (!domainname || !tomoyo_domain_def(domainname))
+		return false;
+	domainname = strchr(domainname, ' ');
+	if (!domainname++)
 		return true;
-	if (*domainname++ != ' ')
-		goto out;
 	while (1) {
 		const unsigned char *cp = strchr(domainname, ' ');
 		if (!cp)
 			break;
 		if (*domainname != '/' ||
 		    !tomoyo_correct_word2(domainname, cp - domainname))
-			goto out;
+			return false;
 		domainname = cp + 1;
 	}
 	return tomoyo_correct_path(domainname);
- out:
-	return false;
 }
 
 /**
@@ -447,7 +442,19 @@ bool tomoyo_correct_domain(const unsigned char *domainname)
  */
 bool tomoyo_domain_def(const unsigned char *buffer)
 {
-	return !strncmp(buffer, TOMOYO_ROOT_NAME, TOMOYO_ROOT_NAME_LEN);
+	const unsigned char *cp;
+	int len;
+	if (*buffer != '<')
+		return false;
+	cp = strchr(buffer, ' ');
+	if (!cp)
+		len = strlen(buffer);
+	else
+		len = cp - buffer;
+	if (buffer[len - 1] != '>' ||
+	    !tomoyo_correct_word2(buffer + 1, len - 2))
+		return false;
+	return true;
 }
 
 /**
@@ -833,22 +840,24 @@ const char *tomoyo_get_exe(void)
 /**
  * tomoyo_get_mode - Get MAC mode.
  *
+ * @ns:      Pointer to "struct tomoyo_policy_namespace".
  * @profile: Profile number.
  * @index:   Index number of functionality.
  *
  * Returns mode.
  */
-int tomoyo_get_mode(const u8 profile, const u8 index)
+int tomoyo_get_mode(const struct tomoyo_policy_namespace *ns, const u8 profile,
+		    const u8 index)
 {
 	u8 mode;
 	const u8 category = TOMOYO_MAC_CATEGORY_FILE;
 	if (!tomoyo_policy_loaded)
 		return TOMOYO_CONFIG_DISABLED;
-	mode = tomoyo_profile(profile)->config[index];
+	mode = tomoyo_profile(ns, profile)->config[index];
 	if (mode == TOMOYO_CONFIG_USE_DEFAULT)
-		mode = tomoyo_profile(profile)->config[category];
+		mode = tomoyo_profile(ns, profile)->config[category];
 	if (mode == TOMOYO_CONFIG_USE_DEFAULT)
-		mode = tomoyo_profile(profile)->default_config;
+		mode = tomoyo_profile(ns, profile)->default_config;
 	return mode & 3;
 }
 
@@ -872,25 +881,10 @@ int tomoyo_init_request_info(struct tomoyo_request_info *r,
 	profile = domain->profile;
 	r->profile = profile;
 	r->type = index;
-	r->mode = tomoyo_get_mode(profile, index);
+	r->mode = tomoyo_get_mode(domain->ns, profile, index);
 	return r->mode;
 }
 
-/**
- * tomoyo_last_word - Get last component of a line.
- *
- * @line: A line.
- *
- * Returns the last word of a line.
- */
-const char *tomoyo_last_word(const char *name)
-{
-	const char *cp = strrchr(name, ' ');
-	if (cp)
-		return cp + 1;
-	return name;
-}
-
 /**
  * tomoyo_domain_quota_is_ok - Check for domain's quota.
  *
@@ -939,7 +933,7 @@ bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r)
 			if (perm & (1 << i))
 				count++;
 	}
-	if (count < tomoyo_profile(domain->profile)->
+	if (count < tomoyo_profile(domain->ns, domain->profile)->
 	    pref[TOMOYO_PREF_MAX_LEARNING_ENTRY])
 		return true;
 	if (!domain->quota_warned) {