sysfs: Restrict mounting sysfs

[karo-tx-linux.git] / lib / kobject.c

diff --git a/lib/kobject.c b/lib/kobject.c
index 4a1f33d435483c850d7b8b28f2409e19fc8ebf8c..3bbde222c90f743928674eb52a131850b4162905 100644 (file)
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -915,6 +915,21 @@ const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj)
        return kobj_child_ns_ops(kobj->parent);
 }
 
+bool kobj_ns_current_may_mount(enum kobj_ns_type type)
+{
+       bool may_mount = false;
+
+       if (type == KOBJ_NS_TYPE_NONE)
+               return true;
+
+       spin_lock(&kobj_ns_type_lock);
+       if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
+           kobj_ns_ops_tbl[type])
+               may_mount = kobj_ns_ops_tbl[type]->current_may_mount();
+       spin_unlock(&kobj_ns_type_lock);
+
+       return may_mount;
+}
 
 void *kobj_ns_grab_current(enum kobj_ns_type type)
 {