TOMOYO: Use GFP_NOFS rather than GFP_KERNEL.

In Ubuntu, security_path_*() hooks are exported to Unionfs. Thus, prepare for
being called from inside VFS functions because I'm not sure whether it is safe
to use GFP_KERNEL or not.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>

security/tomoyo/common.c

@@ -883,7 +883,7 @@ static struct tomoyo_profile *tomoyo_find_or_assign_new_profile(const unsigned
 	ptr = tomoyo_profile_ptr[profile];
 	if (ptr)
 		goto ok;
-	ptr = kmalloc(sizeof(*ptr), GFP_KERNEL);
+	ptr = kmalloc(sizeof(*ptr), GFP_NOFS);
 	if (!tomoyo_memory_ok(ptr)) {
 		kfree(ptr);
 		ptr = NULL;
@@ -1088,7 +1088,7 @@ static int tomoyo_update_manager_entry(const char *manager,
 	if (!saved_manager)
 		return -ENOMEM;
 	if (!is_delete)
-		entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+		entry = kmalloc(sizeof(*entry), GFP_NOFS);
 	mutex_lock(&tomoyo_policy_lock);
 	list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
 		if (ptr->manager != saved_manager)
@@ -1881,7 +1881,7 @@ static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
  */
 static int tomoyo_open_control(const u8 type, struct file *file)
 {
-	struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_KERNEL);
+	struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
 
 	if (!head)
 		return -ENOMEM;
@@ -1942,7 +1942,7 @@ static int tomoyo_open_control(const u8 type, struct file *file)
 	} else {
 		if (!head->readbuf_size)
 			head->readbuf_size = 4096 * 2;
-		head->read_buf = kzalloc(head->readbuf_size, GFP_KERNEL);
+		head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
 		if (!head->read_buf) {
 			kfree(head);
 			return -ENOMEM;
@@ -1956,7 +1956,7 @@ static int tomoyo_open_control(const u8 type, struct file *file)
 		head->write = NULL;
 	} else if (head->write) {
 		head->writebuf_size = 4096 * 2;
-		head->write_buf = kzalloc(head->writebuf_size, GFP_KERNEL);
+		head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
 		if (!head->write_buf) {
 			kfree(head->read_buf);
 			kfree(head);

security/tomoyo/domain.c

@@ -152,7 +152,7 @@ static int tomoyo_update_domain_initializer_entry(const char *domainname,
 	if (!saved_program)
 		goto out;
 	if (!is_delete)
-		entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+		entry = kmalloc(sizeof(*entry), GFP_NOFS);
 	mutex_lock(&tomoyo_policy_lock);
 	list_for_each_entry_rcu(ptr, &tomoyo_domain_initializer_list, list) {
 		if (ptr->is_not != is_not ||
@@ -372,7 +372,7 @@ static int tomoyo_update_domain_keeper_entry(const char *domainname,
 	if (!saved_domainname)
 		goto out;
 	if (!is_delete)
-		entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+		entry = kmalloc(sizeof(*entry), GFP_NOFS);
 	mutex_lock(&tomoyo_policy_lock);
 	list_for_each_entry_rcu(ptr, &tomoyo_domain_keeper_list, list) {
 		if (ptr->is_not != is_not ||
@@ -564,7 +564,7 @@ static int tomoyo_update_alias_entry(const char *original_name,
 	if (!saved_original_name || !saved_aliased_name)
 		goto out;
 	if (!is_delete)
-		entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+		entry = kmalloc(sizeof(*entry), GFP_NOFS);
 	mutex_lock(&tomoyo_policy_lock);
 	list_for_each_entry_rcu(ptr, &tomoyo_alias_list, list) {
 		if (ptr->original_name != saved_original_name ||
@@ -664,7 +664,7 @@ struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char *
 	saved_domainname = tomoyo_get_name(domainname);
 	if (!saved_domainname)
 		return NULL;
-	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+	entry = kzalloc(sizeof(*entry), GFP_NOFS);
 	mutex_lock(&tomoyo_policy_lock);
 	list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
 		if (domain->is_deleted ||
@@ -704,7 +704,7 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
 	 * This function assumes that the size of buffer returned by
 	 * tomoyo_realpath() = TOMOYO_MAX_PATHNAME_LEN.
 	 */
-	struct tomoyo_page_buffer *tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
+	struct tomoyo_page_buffer *tmp = kzalloc(sizeof(*tmp), GFP_NOFS);
 	struct tomoyo_domain_info *old_domain = tomoyo_domain();
 	struct tomoyo_domain_info *domain = NULL;
 	const char *old_domain_name = old_domain->domainname->name;

security/tomoyo/file.c

@@ -99,7 +99,7 @@ static struct tomoyo_path_info *tomoyo_get_path(struct path *path)
 {
 	int error;
 	struct tomoyo_path_info_with_data *buf = kzalloc(sizeof(*buf),
-							 GFP_KERNEL);
+							 GFP_NOFS);
 
 	if (!buf)
 		return NULL;
@@ -174,7 +174,7 @@ static int tomoyo_update_globally_readable_entry(const char *filename,
 	if (!saved_filename)
 		return -ENOMEM;
 	if (!is_delete)
-		entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+		entry = kmalloc(sizeof(*entry), GFP_NOFS);
 	mutex_lock(&tomoyo_policy_lock);
 	list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) {
 		if (ptr->filename != saved_filename)
@@ -321,7 +321,7 @@ static int tomoyo_update_file_pattern_entry(const char *pattern,
 	if (!saved_pattern->is_patterned)
 		goto out;
 	if (!is_delete)
-		entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+		entry = kmalloc(sizeof(*entry), GFP_NOFS);
 	mutex_lock(&tomoyo_policy_lock);
 	list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) {
 		if (saved_pattern != ptr->pattern)
@@ -474,7 +474,7 @@ static int tomoyo_update_no_rewrite_entry(const char *pattern,
 	if (!saved_pattern)
 		return error;
 	if (!is_delete)
-		entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+		entry = kmalloc(sizeof(*entry), GFP_NOFS);
 	mutex_lock(&tomoyo_policy_lock);
 	list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) {
 		if (ptr->pattern != saved_pattern)
@@ -820,7 +820,7 @@ static int tomoyo_update_path_acl(const u8 type, const char *filename,
 	if (!saved_filename)
 		return -ENOMEM;
 	if (!is_delete)
-		entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+		entry = kmalloc(sizeof(*entry), GFP_NOFS);
 	mutex_lock(&tomoyo_policy_lock);
 	list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
 		struct tomoyo_path_acl *acl =
@@ -906,7 +906,7 @@ static int tomoyo_update_path2_acl(const u8 type, const char *filename1,
 	if (!saved_filename1 || !saved_filename2)
 		goto out;
 	if (!is_delete)
-		entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+		entry = kmalloc(sizeof(*entry), GFP_NOFS);
 	mutex_lock(&tomoyo_policy_lock);
 	list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {
 		struct tomoyo_path2_acl *acl =

security/tomoyo/realpath.c

@@ -138,7 +138,7 @@ int tomoyo_realpath_from_path2(struct path *path, char *newname,
  */
 char *tomoyo_realpath_from_path(struct path *path)
 {
-	char *buf = kzalloc(sizeof(struct tomoyo_page_buffer), GFP_KERNEL);
+	char *buf = kzalloc(sizeof(struct tomoyo_page_buffer), GFP_NOFS);
 
 	BUILD_BUG_ON(sizeof(struct tomoyo_page_buffer)
 		     <= TOMOYO_MAX_PATHNAME_LEN - 1);
@@ -269,7 +269,7 @@ const struct tomoyo_path_info *tomoyo_get_name(const char *name)
 		atomic_inc(&ptr->users);
 		goto out;
 	}
-	ptr = kzalloc(sizeof(*ptr) + len, GFP_KERNEL);
+	ptr = kzalloc(sizeof(*ptr) + len, GFP_NOFS);
 	allocated_len = ptr ? ksize(ptr) : 0;
 	if (!ptr || (tomoyo_quota_for_policy &&
 		     atomic_read(&tomoyo_policy_memory_size) + allocated_len