debugobjects: insulate non-fixup logic related to static obj from fixup callbacks

When activating a static object we need make sure that the object is
tracked in the object tracker.  If it is a non-static object then the
activation is illegal.

In previous implementation, each subsystem need take care of this in
their fixup callbacks.  Actually we can put it into debugobjects core.
Thus we can save duplicated code, and have *pure* fixup callbacks.

To achieve this, a new callback "is_static_object" is introduced to let
the type specific code decide whether a object is static or not.  If
yes, we take it into object tracker, otherwise give warning and invoke
fixup callback.

This change has paassed debugobjects selftest, and I also do some test
with all debugobjects supports enabled.

At last, I have a concern about the fixups that can it change the object
which is in incorrect state on fixup? Because the 'addr' may not point
to any valid object if a non-static object is not tracked.  Then Change
such object can overwrite someone's memory and cause unexpected
behaviour.  For example, the timer_fixup_activate bind timer to function
stub_timer.

Link: http://lkml.kernel.org/r/1462576157-14539-1-git-send-email-changbin.du@intel.com
[changbin.du@intel.com: improve code comments where invoke the new is_static_object callback]
  Link: http://lkml.kernel.org/r/1462777431-8171-1-git-send-email-changbin.du@intel.com
Signed-off-by: Du, Changbin <changbin.du@intel.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Josh Triplett <josh@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 34 deletions

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 6751b18fd9ac..e1c0e996b5ae 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -433,6 +433,13 @@ static void *work_debug_hint(void *addr)
 	return ((struct work_struct *) addr)->func;
 }
 
+static bool work_is_static_object(void *addr)
+{
+	struct work_struct *work = addr;
+
+	return test_bit(WORK_STRUCT_STATIC_BIT, work_data_bits(work));
+}
+
 /*
  * fixup_init is called when:
  * - an active object is initialized
@@ -452,39 +459,6 @@ static bool work_fixup_init(void *addr, enum debug_obj_state state)
 }
 
 /*
- * fixup_activate is called when:
- * - an active object is activated
- * - an unknown object is activated (might be a statically initialized object)
- */
-static bool work_fixup_activate(void *addr, enum debug_obj_state state)
-{
-	struct work_struct *work = addr;
-
-	switch (state) {
-
-	case ODEBUG_STATE_NOTAVAILABLE:
-		/*
-		 * This is not really a fixup. The work struct was
-		 * statically initialized. We just make sure that it
-		 * is tracked in the object tracker.
-		 */
-		if (test_bit(WORK_STRUCT_STATIC_BIT, work_data_bits(work))) {
-			debug_object_init(work, &work_debug_descr);
-			debug_object_activate(work, &work_debug_descr);
-			return false;
-		}
-		WARN_ON_ONCE(1);
-		return false;
-
-	case ODEBUG_STATE_ACTIVE:
-		WARN_ON(1);
-
-	default:
-		return false;
-	}
-}
-
-/*
  * fixup_free is called when:
  * - an active object is freed
  */
@@ -505,8 +479,8 @@ static bool work_fixup_free(void *addr, enum debug_obj_state state)
 static struct debug_obj_descr work_debug_descr = {
 	.name		= "work_struct",
 	.debug_hint	= work_debug_hint,
+	.is_static_object = work_is_static_object,
 	.fixup_init	= work_fixup_init,
-	.fixup_activate	= work_fixup_activate,
 	.fixup_free	= work_fixup_free,
 };