TOMOYO: Merge path_group and number_group.

Use common code for "path_group" and "number_group".
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>

security/tomoyo/Makefile

-obj-y = common.o domain.o file.o gc.o load_policy.o memory.o mount.o number_group.o path_group.o realpath.o securityfs_if.o tomoyo.o util.o
+obj-y = common.o domain.o file.o gc.o group.o load_policy.o memory.o mount.o realpath.o securityfs_if.o tomoyo.o util.o

security/tomoyo/common.c

@@ -1186,9 +1186,9 @@ static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
 	if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
 		return tomoyo_write_no_rewrite_policy(data, is_delete);
 	if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP))
-		return tomoyo_write_path_group_policy(data, is_delete);
+		return tomoyo_write_group(data, is_delete, TOMOYO_PATH_GROUP);
 	if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP))
-		return tomoyo_write_number_group_policy(data, is_delete);
+		return tomoyo_write_group(data, is_delete, TOMOYO_NUMBER_GROUP);
 	return -EINVAL;
 }
 

security/tomoyo/common.h

@@ -838,12 +838,10 @@ int tomoyo_write_mount_policy(char *data, struct tomoyo_domain_info *domain,
 int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete);
 /* Create "file_pattern" entry in exception policy. */
 int tomoyo_write_pattern_policy(char *data, const bool is_delete);
-/* Create "path_group" entry in exception policy. */
-int tomoyo_write_path_group_policy(char *data, const bool is_delete);
+/* Create "path_group"/"number_group" entry in exception policy. */
+int tomoyo_write_group(char *data, const bool is_delete, const u8 type);
 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
      __attribute__ ((format(printf, 2, 3)));
-/* Create "number_group" entry in exception policy. */
-int tomoyo_write_number_group_policy(char *data, const bool is_delete);
 /* Find a domain by the given name. */
 struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname);
 /* Find or create a domain by the given name. */
@@ -851,9 +849,10 @@ struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char *
 							    domainname,
 							    const u8 profile);
 struct tomoyo_profile *tomoyo_profile(const u8 profile);
-/* Allocate memory for "struct tomoyo_path_group". */
-struct tomoyo_group *tomoyo_get_path_group(const char *group_name);
-struct tomoyo_group *tomoyo_get_number_group(const char *group_name);
+/*
+ * Allocate memory for "struct tomoyo_path_group"/"struct tomoyo_number_group".
+ */
+struct tomoyo_group *tomoyo_get_group(const char *group_name, const u8 type);
 
 /* Check mode for specified functionality. */
 unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,

security/tomoyo/gc.c

@@ -266,33 +266,25 @@ static void tomoyo_collect_entry(void)
 				goto unlock;
 		}
 	}
-	{
+	for (i = 0; i < TOMOYO_MAX_GROUP; i++) {
+		struct list_head *list = &tomoyo_group_list[i];
+		int id;
 		struct tomoyo_group *group;
-		list_for_each_entry_rcu(group,
-					&tomoyo_group_list[TOMOYO_PATH_GROUP],
-					list) {
-			tomoyo_collect_member(&group->member_list,
-					      TOMOYO_ID_PATH_GROUP);
-			if (!list_empty(&group->member_list) ||
-			    atomic_read(&group->users))
-				continue;
-			if (!tomoyo_add_to_gc(TOMOYO_ID_GROUP,
-					      &group->list))
-				goto unlock;
-		}
+		switch (i) {
+		case 0:
+			id = TOMOYO_ID_PATH_GROUP;
+			break;
+		default:
+			id = TOMOYO_ID_NUMBER_GROUP;
+			break;
 		}
-	{
-		struct tomoyo_group *group;
-		list_for_each_entry_rcu(group,
-					&tomoyo_group_list[TOMOYO_NUMBER_GROUP],
-					list) {
-			tomoyo_collect_member(&group->member_list,
-					      TOMOYO_ID_NUMBER_GROUP);
+		list_for_each_entry(group, list, list) {
+			if (!tomoyo_collect_member(&group->member_list, id))
+				goto unlock;
 			if (!list_empty(&group->member_list) ||
 			    atomic_read(&group->users))
 				continue;
-			if (!tomoyo_add_to_gc(TOMOYO_ID_GROUP,
-					      &group->list))
+			if (!tomoyo_add_to_gc(TOMOYO_ID_GROUP, &group->list))
 				goto unlock;
 		}
 	}

security/tomoyo/number_group.c → security/tomoyo/group.c

 /*
- * security/tomoyo/number_group.c
+ * security/tomoyo/group.c
  *
- * Copyright (C) 2005-2009  NTT DATA CORPORATION
+ * Copyright (C) 2005-2010  NTT DATA CORPORATION
  */
 
 #include <linux/slab.h>
 #include "common.h"
 
-/**
- * tomoyo_get_group - Allocate memory for "struct tomoyo_number_group".
- *
- * @group_name: The name of number group.
- *
- * Returns pointer to "struct tomoyo_number_group" on success,
- * NULL otherwise.
- */
-struct tomoyo_group *tomoyo_get_number_group(const char *group_name)
+static bool tomoyo_same_path_group(const struct tomoyo_acl_head *a,
+				const struct tomoyo_acl_head *b)
 {
-	struct tomoyo_group *entry = NULL;
-	struct tomoyo_group *group = NULL;
-	const struct tomoyo_path_info *saved_group_name;
-	int error = -ENOMEM;
-	if (!tomoyo_correct_word(group_name))
-		return NULL;
-	saved_group_name = tomoyo_get_name(group_name);
-	if (!saved_group_name)
-		return NULL;
-	entry = kzalloc(sizeof(*entry), GFP_NOFS);
-	if (mutex_lock_interruptible(&tomoyo_policy_lock))
-		goto out;
-	list_for_each_entry_rcu(group, &tomoyo_group_list[TOMOYO_NUMBER_GROUP],
-				list) {
-		if (saved_group_name != group->group_name)
-			continue;
-		atomic_inc(&group->users);
-		error = 0;
-		break;
-	}
-	if (error && tomoyo_memory_ok(entry)) {
-		INIT_LIST_HEAD(&entry->member_list);
-		entry->group_name = saved_group_name;
-		saved_group_name = NULL;
-		atomic_set(&entry->users, 1);
-		list_add_tail_rcu(&entry->list,
-				  &tomoyo_group_list[TOMOYO_NUMBER_GROUP]);
-		group = entry;
-		entry = NULL;
-		error = 0;
-	}
-	mutex_unlock(&tomoyo_policy_lock);
- out:
-	tomoyo_put_name(saved_group_name);
-	kfree(entry);
-	return !error ? group : NULL;
+	return container_of(a, struct tomoyo_path_group, head)->member_name ==
+		container_of(b, struct tomoyo_path_group, head)->member_name;
 }
 
 static bool tomoyo_same_number_group(const struct tomoyo_acl_head *a,
 				  const struct tomoyo_acl_head *b)
 {
-	return !memcmp(&container_of(a, struct tomoyo_number_group,
-				     head)->number,
-		       &container_of(b, struct tomoyo_number_group,
-				     head)->number,
-		       sizeof(container_of(a,
-					   struct tomoyo_number_group,
-					   head)->number));
+	return !memcmp(&container_of(a, struct tomoyo_number_group, head)
+		       ->number,
+		       &container_of(b, struct tomoyo_number_group, head)
+		       ->number,
+		       sizeof(container_of(a, struct tomoyo_number_group, head)
+			      ->number));
 }
 
 /**
- * tomoyo_write_number_group_policy - Write "struct tomoyo_number_group" list.
+ * tomoyo_write_group - Write "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
  *
  * @data:      String to parse.
  * @is_delete: True if it is a delete request.
+ * @type:      Type of this group.
  *
- * Returns 0 on success, nagative value otherwise.
+ * Returns 0 on success, negative value otherwise.
  */
-int tomoyo_write_number_group_policy(char *data, const bool is_delete)
+int tomoyo_write_group(char *data, const bool is_delete, const u8 type)
 {
 	struct tomoyo_group *group;
-	struct tomoyo_number_group e = { };
-	int error;
+	struct list_head *member;
 	char *w[2];
-	if (!tomoyo_tokenize(data, w, sizeof(w)))
-		return -EINVAL;
-	if (w[1][0] == '@' || !tomoyo_parse_number_union(w[1], &e.number) ||
-	    e.number.values[0] > e.number.values[1])
+	int error = -EINVAL;
+	if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0])
 		return -EINVAL;
-	group = tomoyo_get_number_group(w[0]);
+	group = tomoyo_get_group(w[0], type);
 	if (!group)
 		return -ENOMEM;
+	member = &group->member_list;
+	if (type == TOMOYO_PATH_GROUP) {
+		struct tomoyo_path_group e = { };
+		e.member_name = tomoyo_get_name(w[1]);
+		if (!e.member_name) {
+			error = -ENOMEM;
+			goto out;
+		}
 		error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
-				     &group->member_list,
-				     tomoyo_same_number_group);
+					     member, tomoyo_same_path_group);
+		tomoyo_put_name(e.member_name);
+	} else if (type == TOMOYO_NUMBER_GROUP) {
+		struct tomoyo_number_group e = { };
+		if (w[1][0] == '@'
+		    || !tomoyo_parse_number_union(w[1], &e.number)
+		    || e.number.values[0] > e.number.values[1])
+			goto out;
+		error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
+					     member, tomoyo_same_number_group);
+		/*
+		 * tomoyo_put_number_union() is not needed because
+		 * w[1][0] != '@'.
+		 */
+	}
+ out:
 	tomoyo_put_group(group);
 	return error;
 }
 
+/**
+ * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group.
+ *
+ * @pathname:        The name of pathname.
+ * @group:           Pointer to "struct tomoyo_path_group".
+ *
+ * Returns true if @pathname matches pathnames in @group, false otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+bool tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
+			       const struct tomoyo_group *group)
+{
+	struct tomoyo_path_group *member;
+	bool matched = false;
+	list_for_each_entry_rcu(member, &group->member_list, head.list) {
+		if (member->head.is_deleted)
+			continue;
+		if (!tomoyo_path_matches_pattern(pathname, member->member_name))
+			continue;
+		matched = true;
+		break;
+	}
+	return matched;
+}
+
 /**
  * tomoyo_number_matches_group - Check whether the given number matches members of the given number group.
  *

security/tomoyo/memory.c

@@ -89,6 +89,50 @@ void tomoyo_memory_free(void *ptr)
 	kfree(ptr);
 }
 
+/**
+ * tomoyo_get_group - Allocate memory for "struct tomoyo_path_group"/"struct tomoyo_number_group".
+ *
+ * @group_name: The name of address group.
+ * @idx:        Index number.
+ *
+ * Returns pointer to "struct tomoyo_group" on success, NULL otherwise.
+ */
+struct tomoyo_group *tomoyo_get_group(const char *group_name, const u8 idx)
+{
+	struct tomoyo_group e = { };
+	struct tomoyo_group *group = NULL;
+	bool found = false;
+	if (!tomoyo_correct_word(group_name) || idx >= TOMOYO_MAX_GROUP)
+		return NULL;
+	e.group_name = tomoyo_get_name(group_name);
+	if (!e.group_name)
+		return NULL;
+	if (mutex_lock_interruptible(&tomoyo_policy_lock))
+		goto out;
+	list_for_each_entry(group, &tomoyo_group_list[idx], list) {
+		if (e.group_name != group->group_name)
+			continue;
+		atomic_inc(&group->users);
+		found = true;
+		break;
+	}
+	if (!found) {
+		struct tomoyo_group *entry = tomoyo_commit_ok(&e, sizeof(e));
+		if (entry) {
+			INIT_LIST_HEAD(&entry->member_list);
+			atomic_set(&entry->users, 1);
+			list_add_tail_rcu(&entry->list,
+					  &tomoyo_group_list[idx]);
+			group = entry;
+			found = true;
+		}
+	}
+	mutex_unlock(&tomoyo_policy_lock);
+ out:
+	tomoyo_put_name(e.group_name);
+	return found ? group : NULL;
+}
+
 /*
  * tomoyo_name_list is used for holding string data used by TOMOYO.
  * Since same string data is likely used for multiple times (e.g.

security/tomoyo/path_group.c

-/*
- * security/tomoyo/path_group.c
- *
- * Copyright (C) 2005-2009  NTT DATA CORPORATION
- */
-
-#include <linux/slab.h>
-#include "common.h"
-
-/**
- * tomoyo_get_group - Allocate memory for "struct tomoyo_path_group".
- *
- * @group_name: The name of pathname group.
- *
- * Returns pointer to "struct tomoyo_path_group" on success, NULL otherwise.
- */
-struct tomoyo_group *tomoyo_get_path_group(const char *group_name)
-{
-	struct tomoyo_group *entry = NULL;
-	struct tomoyo_group *group = NULL;
-	const struct tomoyo_path_info *saved_group_name;
-	int error = -ENOMEM;
-	if (!tomoyo_correct_word(group_name))
-		return NULL;
-	saved_group_name = tomoyo_get_name(group_name);
-	if (!saved_group_name)
-		return NULL;
-	entry = kzalloc(sizeof(*entry), GFP_NOFS);
-	if (mutex_lock_interruptible(&tomoyo_policy_lock))
-		goto out;
-	list_for_each_entry_rcu(group, &tomoyo_group_list[TOMOYO_PATH_GROUP],
-				list) {
-		if (saved_group_name != group->group_name)
-			continue;
-		atomic_inc(&group->users);
-		error = 0;
-		break;
-	}
-	if (error && tomoyo_memory_ok(entry)) {
-		INIT_LIST_HEAD(&entry->member_list);
-		entry->group_name = saved_group_name;
-		saved_group_name = NULL;
-		atomic_set(&entry->users, 1);
-		list_add_tail_rcu(&entry->list,
-				  &tomoyo_group_list[TOMOYO_PATH_GROUP]);
-		group = entry;
-		entry = NULL;
-		error = 0;
-	}
-	mutex_unlock(&tomoyo_policy_lock);
- out:
-	tomoyo_put_name(saved_group_name);
-	kfree(entry);
-	return !error ? group : NULL;
-}
-
-static bool tomoyo_same_path_group(const struct tomoyo_acl_head *a,
-				   const struct tomoyo_acl_head *b)
-{
-	return container_of(a, struct tomoyo_path_group, head)
-		->member_name ==
-		container_of(b, struct tomoyo_path_group, head)
-		->member_name;
-}
-
-/**
- * tomoyo_write_path_group_policy - Write "struct tomoyo_path_group" list.
- *
- * @data:      String to parse.
- * @is_delete: True if it is a delete request.
- *
- * Returns 0 on success, nagative value otherwise.
- */
-int tomoyo_write_path_group_policy(char *data, const bool is_delete)
-{
-	struct tomoyo_group *group;
-	struct tomoyo_path_group e = { };
-	int error = is_delete ? -ENOENT : -ENOMEM;
-	char *w[2];
-	if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0])
-		return -EINVAL;
-	group = tomoyo_get_path_group(w[0]);
-	if (!group)
-		return -ENOMEM;
-	e.member_name = tomoyo_get_name(w[1]);
-	if (!e.member_name)
-		goto out;
-	error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
-				     &group->member_list,
-				     tomoyo_same_path_group);
- out:
-	tomoyo_put_name(e.member_name);
-	tomoyo_put_group(group);
-	return error;
-}
-
-/**
- * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group.
- *
- * @pathname:        The name of pathname.
- * @group:           Pointer to "struct tomoyo_path_group".
- *
- * Returns true if @pathname matches pathnames in @group, false otherwise.
- *
- * Caller holds tomoyo_read_lock().
- */
-bool tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
-			       const struct tomoyo_group *group)
-{
-	struct tomoyo_path_group *member;
-	bool matched = false;
-	list_for_each_entry_rcu(member, &group->member_list, head.list) {
-		if (member->head.is_deleted)
-			continue;
-		if (!tomoyo_path_matches_pattern(pathname,
-						 member->member_name))
-			continue;
-		matched = true;
-		break;
-	}
-	return matched;
-}

security/tomoyo/util.c

@@ -92,7 +92,7 @@ bool tomoyo_parse_name_union(const char *filename,
 	if (!tomoyo_correct_word(filename))
 		return false;
 	if (filename[0] == '@') {
-		ptr->group = tomoyo_get_path_group(filename + 1);
+		ptr->group = tomoyo_get_group(filename + 1, TOMOYO_PATH_GROUP);
 		ptr->is_group = true;
 		return ptr->group != NULL;
 	}
@@ -117,7 +117,7 @@ bool tomoyo_parse_number_union(char *data, struct tomoyo_number_union *num)
 	if (data[0] == '@') {
 		if (!tomoyo_correct_word(data))
 			return false;
-		num->group = tomoyo_get_number_group(data + 1);
+		num->group = tomoyo_get_group(data + 1, TOMOYO_NUMBER_GROUP);
 		num->is_group = true;
 		return num->group != NULL;
 	}