Commit 4ba053c0 authored Oct 13, 2010 by Hitoshi Mitake Committed by Ingo Molnar Oct 18, 2010

lockdep: Check the depth of subclass



Current look_up_lock_class() doesn't check the parameter "subclass".
This rarely rises problems because the main caller of this function,
register_lock_class(), checks it.

But register_lock_class() is not the only function which calls
look_up_lock_class(). lock_set_class() and its callees also call it.
And lock_set_class() doesn't check this parameter.

This will rise problems when the the value of subclass is larger than
MAX_LOCKDEP_SUBCLASSES. Because the address (used as the key of class)
caliculated with too large subclass has a probability to point
another key in different lock_class_key.

Of course this problem depends on the memory layout and
occurs with really low probability.

Signed-off-by: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Dmitry Torokhov <dtor@mail.ru>
Cc: Vojtech Pavlik <vojtech@ucw.cz>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1286958626-986-1-git-send-email-mitake@dcl.info.waseda.ac.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 62016250

kernel/lockdep.c

+10 −8

Original line number	Diff line number	Diff line
		@@ -639,6 +639,16 @@ look_up_lock_class(struct lockdep_map *lock, unsigned int subclass)
		}
		#endif

		if (unlikely(subclass >= MAX_LOCKDEP_SUBCLASSES)) {
		debug_locks_off();
		printk(KERN_ERR
		"BUG: looking up invalid subclass: %u\n", subclass);
		printk(KERN_ERR
		"turning off the locking correctness validator.\n");
		dump_stack();
		return NULL;
		}

		/*
		* Static locks do not have their class-keys yet - for them the key
		* is the lock object itself:
		@@ -2745,14 +2755,6 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
		if (DEBUG_LOCKS_WARN_ON(!irqs_disabled()))
		return 0;

		if (unlikely(subclass >= MAX_LOCKDEP_SUBCLASSES)) {
		debug_locks_off();
		printk("BUG: MAX_LOCKDEP_SUBCLASSES too low!\n");
		printk("turning off the locking correctness validator.\n");
		dump_stack();
		return 0;
		}

		if (lock->key == &__lockdep_no_validate__)
		check = 1;