Paul E. McKenney 6a4fea54ab rcu: Use READ_ONCE() for ->expmask in rcu_read_unlock_special() ... commit c51f83c315 upstream. The rcu_node structure's ->expmask field is updated only when holding the ->lock, but is also accessed locklessly. This means that all ->expmask updates must use WRITE_ONCE() and all reads carried out without holding ->lock must use READ_ONCE(). This commit therefore changes the lockless ->expmask read in rcu_read_unlock_special() to use READ_ONCE(). Reported-by: syzbot+99f4ddade3c22ab0cf23@syzkaller.appspotmail.com Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Acked-by: Marco Elver <elver@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-02-11 04:35:08 -08:00
..
Kconfig	rcu: Use CONFIG_PREEMPTION	2019-07-31 19:03:35 +02:00
Kconfig.debug	rcu: Add support for consolidated-RCU reader checking	2019-08-09 11:00:35 -07:00
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
rcu.h	rcu: Add kernel parameter to dump trace after RCU CPU stall warning	2019-08-01 14:05:51 -07:00
rcu_segcblist.c	rcu/nocb: Add bypass callback queueing	2019-08-13 14:37:32 -07:00
rcu_segcblist.h	rcu/nocb: Add bypass callback queueing	2019-08-13 14:37:32 -07:00
rcuperf.c	rcuperf: Make rcuperf kernel test more robust for !expedited mode	2019-08-01 14:30:22 -07:00
rcutorture.c	rcu/nocb: Print no-CBs diagnostics when rcutorture writer unduly delayed	2019-08-13 14:38:24 -07:00
srcutiny.c	srcu: Remove cleanup_srcu_struct_quiesced()	2019-03-26 14:39:24 -07:00
srcutree.c	srcu: Apply *_ONCE() to ->srcu_last_gp_end	2020-02-11 04:35:08 -08:00
sync.c	rcu/sync: Simplify the state machine	2019-05-28 09:05:23 -07:00
tiny.c	rcu: rcu_qs -- Use raise_softirq_irqoff to not save irqs twice	2019-03-26 14:37:49 -07:00
tree.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2019-09-16 17:25:49 -07:00
tree.h	rcu/nocb: Print no-CBs diagnostics when rcutorture writer unduly delayed	2019-08-13 14:38:24 -07:00
tree_exp.h	rcu: Use *_ONCE() to protect lockless ->expmask accesses	2020-02-11 04:35:08 -08:00
tree_plugin.h	rcu: Use READ_ONCE() for ->expmask in rcu_read_unlock_special()	2020-02-11 04:35:08 -08:00
tree_stall.h	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2019-09-16 17:25:49 -07:00
update.c	Merge branches 'consolidate.2019.08.01b', 'fixes.2019.08.12a', 'lists.2019.08.13a' and 'torture.2019.08.01b' into HEAD	2019-08-13 14:30:30 -07:00