TOMOYO: Remove tomoyo_policy_memory_lock spinlock.
tomoyo_policy_lock mutex already protects it.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/tomoyo/common.h b/security/tomoyo/common.h
index a0212fb..ed311d7 100644
--- a/security/tomoyo/common.h
+++ b/security/tomoyo/common.h
@@ -1043,7 +1043,6 @@
void tomoyo_get_attributes(struct tomoyo_obj_info *obj);
void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns);
void tomoyo_load_policy(const char *filename);
-void tomoyo_memory_free(void *ptr);
void tomoyo_normalize_line(unsigned char *buffer);
void tomoyo_notify_gc(struct tomoyo_io_buffer *head, const bool is_register);
void tomoyo_print_ip(char *buf, const unsigned int size,
diff --git a/security/tomoyo/gc.c b/security/tomoyo/gc.c
index f2295c6..c3214b3 100644
--- a/security/tomoyo/gc.c
+++ b/security/tomoyo/gc.c
@@ -8,6 +8,21 @@
#include <linux/kthread.h>
#include <linux/slab.h>
+/**
+ * tomoyo_memory_free - Free memory for elements.
+ *
+ * @ptr: Pointer to allocated memory.
+ *
+ * Returns nothing.
+ *
+ * Caller holds tomoyo_policy_lock mutex.
+ */
+static inline void tomoyo_memory_free(void *ptr)
+{
+ tomoyo_memory_used[TOMOYO_MEMORY_POLICY] -= ksize(ptr);
+ kfree(ptr);
+}
+
/* The list for "struct tomoyo_io_buffer". */
static LIST_HEAD(tomoyo_io_buffer_list);
/* Lock for protecting tomoyo_io_buffer_list. */
@@ -215,6 +230,8 @@
* @element: Pointer to "struct list_head".
*
* Returns nothing.
+ *
+ * Caller holds tomoyo_policy_lock mutex.
*/
static inline void tomoyo_del_domain(struct list_head *element)
{
@@ -416,12 +433,13 @@
(element, typeof(struct tomoyo_domain_info),
list)->users))
goto reinject;
- tomoyo_del_domain(element);
break;
case TOMOYO_MAX_POLICY:
break;
}
mutex_lock(&tomoyo_policy_lock);
+ if (type == TOMOYO_ID_DOMAIN)
+ tomoyo_del_domain(element);
tomoyo_memory_free(element);
return;
reinject:
diff --git a/security/tomoyo/memory.c b/security/tomoyo/memory.c
index 277b9ad..0e99571 100644
--- a/security/tomoyo/memory.c
+++ b/security/tomoyo/memory.c
@@ -27,8 +27,6 @@
panic("MAC Initialization failed.\n");
}
-/* Lock for protecting tomoyo_memory_used. */
-static DEFINE_SPINLOCK(tomoyo_policy_memory_lock);
/* Memoy currently used by policy/audit log/query. */
unsigned int tomoyo_memory_used[TOMOYO_MAX_MEMORY_STAT];
/* Memory quota for "policy"/"audit log"/"query". */
@@ -42,22 +40,19 @@
* Returns true on success, false otherwise.
*
* Returns true if @ptr is not NULL and quota not exceeded, false otherwise.
+ *
+ * Caller holds tomoyo_policy_lock mutex.
*/
bool tomoyo_memory_ok(void *ptr)
{
if (ptr) {
const size_t s = ksize(ptr);
- bool result;
- spin_lock(&tomoyo_policy_memory_lock);
tomoyo_memory_used[TOMOYO_MEMORY_POLICY] += s;
- result = !tomoyo_memory_quota[TOMOYO_MEMORY_POLICY] ||
- tomoyo_memory_used[TOMOYO_MEMORY_POLICY] <=
- tomoyo_memory_quota[TOMOYO_MEMORY_POLICY];
- if (!result)
- tomoyo_memory_used[TOMOYO_MEMORY_POLICY] -= s;
- spin_unlock(&tomoyo_policy_memory_lock);
- if (result)
+ if (!tomoyo_memory_quota[TOMOYO_MEMORY_POLICY] ||
+ tomoyo_memory_used[TOMOYO_MEMORY_POLICY] <=
+ tomoyo_memory_quota[TOMOYO_MEMORY_POLICY])
return true;
+ tomoyo_memory_used[TOMOYO_MEMORY_POLICY] -= s;
}
tomoyo_warn_oom(__func__);
return false;
@@ -71,6 +66,8 @@
*
* Returns pointer to allocated memory on success, NULL otherwise.
* @data is zero-cleared on success.
+ *
+ * Caller holds tomoyo_policy_lock mutex.
*/
void *tomoyo_commit_ok(void *data, const unsigned int size)
{
@@ -85,20 +82,6 @@
}
/**
- * tomoyo_memory_free - Free memory for elements.
- *
- * @ptr: Pointer to allocated memory.
- */
-void tomoyo_memory_free(void *ptr)
-{
- size_t s = ksize(ptr);
- spin_lock(&tomoyo_policy_memory_lock);
- tomoyo_memory_used[TOMOYO_MEMORY_POLICY] -= s;
- spin_unlock(&tomoyo_policy_memory_lock);
- kfree(ptr);
-}
-
-/**
* tomoyo_get_group - Allocate memory for "struct tomoyo_path_group"/"struct tomoyo_number_group".
*
* @param: Pointer to "struct tomoyo_acl_param".