[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <20240715132638.3141-1-bottaawesome633@gmail.com>
Date: Mon, 15 Jul 2024 16:26:37 +0300
From: botta633 <bottaawesome633@...il.com>
To: linux-kernel@...r.kernel.org
Cc: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Will Deacon <will@...nel.org>,
Waiman Long <longman@...hat.com>,
Boqun Feng <boqun.feng@...il.com>,
linux-ext4@...r.kernel.org,
syzkaller@...glegroups.com,
Ahmed Ehab <bottaawesome633@...il.com>,
syzbot+7f4a6f7f7051474e40ad@...kaller.appspotmail.com,
stable@...r.kernel.org
Subject: [PATCH v4 1/2] locking/lockdep: Forcing subclasses to have same name pointer as their parent class
From: Ahmed Ehab <bottaawesome633@...il.com>
Preventing lockdep_set_subclass from creating a new instance of the
string literal. Hence, we will always have the same class->name among
parent and subclasses. This prevents kernel panics when looking up a
lock class while comparing class locks and class names.
Reported-by: <syzbot+7f4a6f7f7051474e40ad@...kaller.appspotmail.com>
Fixes: de8f5e4f2dc1f ("lockdep: Introduce wait-type checks")
Cc: <stable@...r.kernel.org>
Signed-off-by: Ahmed Ehab <bottaawesome633@...il.com>
---
v3->v4:
- Fixed subject line truncation.
include/linux/lockdep.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index 08b0d1d9d78b..df8fa5929de7 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -173,7 +173,7 @@ static inline void lockdep_init_map(struct lockdep_map *lock, const char *name,
(lock)->dep_map.lock_type)
#define lockdep_set_subclass(lock, sub) \
- lockdep_init_map_type(&(lock)->dep_map, #lock, (lock)->dep_map.key, sub,\
+ lockdep_init_map_type(&(lock)->dep_map, (lock)->dep_map.name, (lock)->dep_map.key, sub,\
(lock)->dep_map.wait_type_inner, \
(lock)->dep_map.wait_type_outer, \
(lock)->dep_map.lock_type)
--
2.45.2
Powered by blists - more mailing lists