userspace: move _k_object_validate() definition

This API only gets used inside system call handlers and a specific test
case dedicated to it. Move definition to the private kernel header along
with the rest of the defines for system call handlers.

A non-userspace inline variant of this function is unnecessary and has
been deleted.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>

include/kernel.h

@@ -178,28 +178,6 @@ struct _k_object {
 } __packed;
 
 #define K_OBJ_FLAG_INITIALIZED	BIT(0)
-/**
- * Ensure a system object is a valid object of the expected type
- *
- * Searches for the object and ensures that it is indeed an object
- * of the expected type, that the caller has the right permissions on it,
- * and that the object has been initialized.
- *
- * This function is intended to be called on the kernel-side system
- * call handlers to validate kernel object pointers passed in from
- * userspace.
- *
- * @param obj Address of the kernel object
- * @param otype Expected type of the kernel object
- * @param init If true, this is for an init function and we will not error
- *	   out if the object is not initialized
- * @return 0 If the object is valid
- *         -EBADF if not a valid object of the specified type
- *         -EPERM If the caller does not have permissions
- *         -EINVAL Object is not initialized
- */
-int _k_object_validate(void *obj, enum k_objects otype, int init);
-
 
 /**
  * Lookup a kernel object and init its metadata if it exists
@@ -212,15 +190,6 @@ int _k_object_validate(void *obj, enum k_objects otype, int init);
  */
 void _k_object_init(void *obj);
 #else
-static inline int _k_object_validate(void *obj, enum k_objects otype, int init)
-{
-	ARG_UNUSED(obj);
-	ARG_UNUSED(otype);
-	ARG_UNUSED(init);
-
-	return 0;
-}
-
 static inline void _k_object_init(void *obj)
 {
 	ARG_UNUSED(obj);

kernel/include/syscall_handler.h

@@ -17,6 +17,28 @@
 
 extern const _k_syscall_handler_t _k_syscall_table[K_SYSCALL_LIMIT];
 
+/**
+ * Ensure a system object is a valid object of the expected type
+ *
+ * Searches for the object and ensures that it is indeed an object
+ * of the expected type, that the caller has the right permissions on it,
+ * and that the object has been initialized.
+ *
+ * This function is intended to be called on the kernel-side system
+ * call handlers to validate kernel object pointers passed in from
+ * userspace.
+ *
+ * @param obj Address of the kernel object
+ * @param otype Expected type of the kernel object
+ * @param init If true, this is for an init function and we will not error
+ *	   out if the object is not initialized
+ * @return 0 If the object is valid
+ *         -EBADF if not a valid object of the specified type
+ *         -EPERM If the caller does not have permissions
+ *         -EINVAL Object is not initialized
+ */
+int _k_object_validate(void *obj, enum k_objects otype, int init);
+
 /**
  * @brief Runtime expression check for system call arguments
  *

tests/kernel/mem_protect/obj_validation/src/main.c

@@ -8,6 +8,7 @@
 #include <tc_util.h>
 #include <kernel_structs.h>
 #include <irq_offload.h>
+#include <syscall_handler.h>
 
 #define SEM_ARRAY_SIZE	16