TOMOYO: Add refcounter on string data.
Add refcounter to "struct tomoyo_name_entry" and replace tomoyo_save_name()
with tomoyo_get_name()/tomoyo_put_name() pair so that we can kfree() when
garbage collector is added.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/tomoyo/file.c b/security/tomoyo/file.c
index f4a2771..a49e18c 100644
--- a/security/tomoyo/file.c
+++ b/security/tomoyo/file.c
@@ -222,7 +222,7 @@
if (!tomoyo_is_correct_path(filename, 1, 0, -1, __func__))
return -EINVAL;
- saved_filename = tomoyo_save_name(filename);
+ saved_filename = tomoyo_get_name(filename);
if (!saved_filename)
return -ENOMEM;
if (!is_delete)
@@ -237,11 +237,13 @@
}
if (!is_delete && error && tomoyo_memory_ok(entry)) {
entry->filename = saved_filename;
+ saved_filename = NULL;
list_add_tail_rcu(&entry->list, &tomoyo_globally_readable_list);
entry = NULL;
error = 0;
}
mutex_unlock(&tomoyo_policy_lock);
+ tomoyo_put_name(saved_filename);
kfree(entry);
return error;
}
@@ -365,7 +367,7 @@
const struct tomoyo_path_info *saved_pattern;
int error = is_delete ? -ENOENT : -ENOMEM;
- saved_pattern = tomoyo_save_name(pattern);
+ saved_pattern = tomoyo_get_name(pattern);
if (!saved_pattern)
return error;
if (!saved_pattern->is_patterned)
@@ -382,6 +384,7 @@
}
if (!is_delete && error && tomoyo_memory_ok(entry)) {
entry->pattern = saved_pattern;
+ saved_pattern = NULL;
list_add_tail_rcu(&entry->list, &tomoyo_pattern_list);
entry = NULL;
error = 0;
@@ -389,6 +392,7 @@
mutex_unlock(&tomoyo_policy_lock);
out:
kfree(entry);
+ tomoyo_put_name(saved_pattern);
return error;
}
@@ -518,7 +522,7 @@
if (!tomoyo_is_correct_path(pattern, 0, 0, 0, __func__))
return -EINVAL;
- saved_pattern = tomoyo_save_name(pattern);
+ saved_pattern = tomoyo_get_name(pattern);
if (!saved_pattern)
return error;
if (!is_delete)
@@ -533,11 +537,13 @@
}
if (!is_delete && error && tomoyo_memory_ok(entry)) {
entry->pattern = saved_pattern;
+ saved_pattern = NULL;
list_add_tail_rcu(&entry->list, &tomoyo_no_rewrite_list);
entry = NULL;
error = 0;
}
mutex_unlock(&tomoyo_policy_lock);
+ tomoyo_put_name(saved_pattern);
kfree(entry);
return error;
}
@@ -867,7 +873,7 @@
return -EINVAL;
if (!tomoyo_is_correct_path(filename, 0, 0, 0, __func__))
return -EINVAL;
- saved_filename = tomoyo_save_name(filename);
+ saved_filename = tomoyo_get_name(filename);
if (!saved_filename)
return -ENOMEM;
if (!is_delete)
@@ -913,12 +919,14 @@
if (perm == (1 << TOMOYO_TYPE_READ_WRITE_ACL))
entry->perm |= rw_mask;
entry->filename = saved_filename;
+ saved_filename = NULL;
list_add_tail_rcu(&entry->head.list, &domain->acl_info_list);
entry = NULL;
error = 0;
}
mutex_unlock(&tomoyo_policy_lock);
kfree(entry);
+ tomoyo_put_name(saved_filename);
return error;
}
@@ -952,8 +960,8 @@
if (!tomoyo_is_correct_path(filename1, 0, 0, 0, __func__) ||
!tomoyo_is_correct_path(filename2, 0, 0, 0, __func__))
return -EINVAL;
- saved_filename1 = tomoyo_save_name(filename1);
- saved_filename2 = tomoyo_save_name(filename2);
+ saved_filename1 = tomoyo_get_name(filename1);
+ saved_filename2 = tomoyo_get_name(filename2);
if (!saved_filename1 || !saved_filename2)
goto out;
if (!is_delete)
@@ -979,13 +987,17 @@
entry->head.type = TOMOYO_TYPE_DOUBLE_PATH_ACL;
entry->perm = perm;
entry->filename1 = saved_filename1;
+ saved_filename1 = NULL;
entry->filename2 = saved_filename2;
+ saved_filename2 = NULL;
list_add_tail_rcu(&entry->head.list, &domain->acl_info_list);
entry = NULL;
error = 0;
}
mutex_unlock(&tomoyo_policy_lock);
out:
+ tomoyo_put_name(saved_filename1);
+ tomoyo_put_name(saved_filename2);
kfree(entry);
return error;
}