Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Davidlohr Bueso 2ec0afec5c BACKPORT: locking/rtmutex: Skip remove_waiter() when waiter is not enqueued ... syzbot triggered the following splat in remove_waiter() via FUTEX_CMP_REQUEUE_PI: KASAN: null-ptr-deref in range [0x0000000000000a88-0x0000000000000a8f] class_raw_spinlock_constructor remove_waiter+0x159/0x1200 kernel/locking/rtmutex.c:1561 rt_mutex_start_proxy_lock+0x103/0x120 futex_requeue+0x10e4/0x20d0 __x64_sys_futex+0x34f/0x4d0 task_blocks_on_rt_mutex() does not arm the waiter upon deadlock detection, leaving waiter->task nil, where 3bfdc63936dd ("rtmutex: Use waiter::task instead of current in remove_waiter()") made this fatal. Furthermore, rt_mutex_start_proxy_lock() should not be calling into remove_waiter() upon a successfully grabbing the rtmutex. 1a1fb985f2 ("futex: Handle early deadlock return correctly"), moved the remove_waiter() out of __rt_mutex_start_proxy_lock() (where 'ret' was only ever 0 or < 0) into the wrapper. Tighten this check to account for try_to_take_rt_mutex(). Fixes: 3bfdc63936dd ("rtmutex: Use waiter::task instead of current in remove_waiter()") Change-Id: Ib19a2f223ba67d20496c0ae95096747f5350c520 Reported-by: syzbot+78147abe6c524f183ee9@syzkaller.appspotmail.com Signed-off-by: Davidlohr Bueso <dave@stgolabs.net> Signed-off-by: Thomas Gleixner <tglx@kernel.org> Cc: stable@vger.kernel.org Closes: https://lore.kernel.org/all/69f114ac.050a0220.ac8b.0003.GAE@google.com/ Link: https://patch.msgid.link/20260507112913.1019537-1-dave@stgolabs.net Signed-off-by: Tashfin Shakeer Rhythm <tashfinshakeerrhythm@gmail.com>		2026-07-29 03:30:48 +06:00
..
lock_events.c
lock_events.h
lock_events_list.h
lockdep.c	locking/lockdep: Decrease nr_unused_locks if lock unused in zap_class()	2025-05-02 07:39:15 +02:00
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	BACKPORT: locking/rtmutex: Skip remove_waiter() when waiter is not enqueued	2026-07-29 03:30:48 +06:00
rtmutex.h
rtmutex_common.h
rwsem.c
rwsem.h
semaphore.c	locking/semaphore: Use wake_q to wake up processes outside lock critical section	2025-04-10 14:29:42 +02:00
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