Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Waiman Long abdc85d630 locking/lockdep: Avoid potential access of invalid memory in lock_class ... commit 61cc4534b6550997c97a03759ab46b29d44c0017 upstream. It was found that reading /proc/lockdep after a lockdep splat may potentially cause an access to freed memory if lockdep_unregister_key() is called after the splat but before access to /proc/lockdep [1]. This is due to the fact that graph_lock() call in lockdep_unregister_key() fails after the clearing of debug_locks by the splat process. After lockdep_unregister_key() is called, the lock_name may be freed but the corresponding lock_class structure still have a reference to it. That invalid memory pointer will then be accessed when /proc/lockdep is read by a user and a use-after-free (UAF) error will be reported if KASAN is enabled. To fix this problem, lockdep_unregister_key() is now modified to always search for a matching key irrespective of the debug_locks state and zap the corresponding lock class if a matching one is found. [1] https://lore.kernel.org/lkml/77f05c15-81b6-bddd-9650-80d5f23fe330@i-love.sakura.ne.jp/ Fixes: 8b39adbee8 ("locking/lockdep: Make lockdep_unregister_key() honor 'debug_locks' again") Reported-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Link: https://lkml.kernel.org/r/20220103023558.1377055-1-longman@redhat.com Signed-off-by: Carlos Llamas <cmllamas@google.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-11-08 16:20:46 +01:00
..
lock_events.c
lock_events.h
lock_events_list.h
lockdep.c	locking/lockdep: Avoid potential access of invalid memory in lock_class	2024-11-08 16:20:46 +01:00
lockdep_internals.h
lockdep_proc.c
lockdep_states.h
locktorture.c
Makefile
mcs_spinlock.h
mutex-debug.c
mutex-debug.h
mutex.c
mutex.h
osq_lock.c
percpu-rwsem.c
qrwlock.c
qspinlock.c
qspinlock_paravirt.h
qspinlock_stat.h
rtmutex-debug.c
rtmutex-debug.h
rtmutex.c	rtmutex: Drop rt_mutex::wait_lock before scheduling	2024-09-12 11:03:57 +02:00
rtmutex.h
rtmutex_common.h
rwsem.c
rwsem.h
semaphore.c
spinlock.c
spinlock_debug.c
test-ww_mutex.c	locking/ww_mutex/test: Fix potential workqueue corruption	2023-11-28 16:50:13 +00:00