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

@@ -1 +1 @@
-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

@@ -838,22 +838,21 @@ 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. */
 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/group.c

@@ -0,0 +1,130 @@
+/*
+ * security/tomoyo/group.c
+ *
+ * Copyright (C) 2005-2010  NTT DATA CORPORATION
+ */
+
+#include <linux/slab.h>
+#include "common.h"
+
+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;
+}
+
+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));
+}
+
+/**
+ * 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, negative value otherwise.
+ */
+int tomoyo_write_group(char *data, const bool is_delete, const u8 type)
+{
+	struct tomoyo_group *group;
+	struct list_head *member;
+	char *w[2];
+	int error = -EINVAL;
+	if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0])
+		return -EINVAL;
+	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,
+					     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.
+ *
+ * @min:   Min number.
+ * @max:   Max number.
+ * @group: Pointer to "struct tomoyo_number_group".
+ *
+ * Returns true if @min and @max partially overlaps @group, false otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+bool tomoyo_number_matches_group(const unsigned long min,
+				 const unsigned long max,
+				 const struct tomoyo_group *group)
+{
+	struct tomoyo_number_group *member;
+	bool matched = false;
+	list_for_each_entry_rcu(member, &group->member_list, head.list) {
+		if (member->head.is_deleted)
+			continue;
+		if (min > member->number.values[1] ||
+		    max < member->number.values[0])
+			continue;
+		matched = true;
+		break;
+	}
+	return matched;
+}

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.