TOMOYO: Add refcounter on domain structure.
Add refcounter to "struct tomoyo_domain_info" since garbage collector needs to
determine whether this struct is referred by "struct cred"->security or not.
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/common.h b/security/tomoyo/common.h
index f6aff59..521b4b5 100644
--- a/security/tomoyo/common.h
+++ b/security/tomoyo/common.h
@@ -234,6 +234,10 @@
* name of the domain to be created was too long or it could not allocate
* memory. If set to true, more than one process continued execve()
* without domain transition.
+ * (9) "users" is an atomic_t that holds how many "struct cred"->security
+ * are referring this "struct tomoyo_domain_info". If is_deleted == true
+ * and users == 0, this struct will be kfree()d upon next garbage
+ * collection.
*
* A domain's lifecycle is an analogy of files on / directory.
* Multiple domains with the same domainname cannot be created (as with
@@ -252,6 +256,7 @@
bool quota_warned; /* Quota warnning flag. */
bool ignore_global_allow_read; /* Ignore "allow_read" flag. */
bool transition_failed; /* Domain transition failed flag. */
+ atomic_t users; /* Number of referring credentials. */
};
/*