Andy Whitcroft 5ff5ed86e1 PM / hibernate: memory_bm_find_bit(): Tighten node optimisation ... [ Upstream commit da6043fe85 ] When looking for a bit by number we make use of the cached result from the preceding lookup to speed up operation. Firstly we check if the requested pfn is within the cached zone and if not lookup the new zone. We then check if the offset for that pfn falls within the existing cached node. This happens regardless of whether the node is within the zone we are now scanning. With certain memory layouts it is possible for this to false trigger creating a temporary alias for the pfn to a different bit. This leads the hibernation code to free memory which it was never allocated with the expected fallout. Ensure the zone we are scanning matches the cached zone before considering the cached node. Deep thanks go to Andrea for many, many, many hours of hacking and testing that went into cornering this bug. Reported-by: Andrea Righi <andrea.righi@canonical.com> Tested-by: Andrea Righi <andrea.righi@canonical.com> Signed-off-by: Andy Whitcroft <apw@canonical.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-01-12 11:24:11 +01:00
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autosleep.c
console.c	PM / sleep: Make pm_prepare_console() return void	2016-06-15 01:26:04 +02:00
hibernate.c	x86/power: Fix 'nosmt' vs hibernation triple fault during resume	2019-06-11 12:22:48 +02:00
Kconfig	PM / sleep: wakeup: Fix build error caused by missing SRCU support	2018-09-09 20:01:23 +02:00
main.c	PM / sleep: enable suspend-to-idle even without registered suspend_ops	2016-09-13 02:17:19 +02:00
Makefile	PM / Hibernate: Don't let kasan instrument snapshot.c	2016-06-14 00:38:56 +02:00
power.h	x86/power: Fix swsusp_arch_resume prototype	2018-05-30 07:50:24 +02:00
poweroff.c
process.c	sched/cpuset/pm: Fix cpuset vs. suspend-resume bugs	2017-10-12 11:51:25 +02:00
qos.c	PM / QoS: avoid calling cancel_delayed_work_sync() during early boot	2016-09-05 15:07:53 +02:00
snapshot.c	PM / hibernate: memory_bm_find_bit(): Tighten node optimisation	2020-01-12 11:24:11 +01:00
suspend.c	PM / suspend: Fix missing KERN_CONT for suspend message	2016-10-24 14:38:02 +02:00
suspend_test.c	PM / sleep: fix device reference leak in test_suspend	2016-11-02 05:10:04 +01:00
swap.c	Power management material for v4.8-rc1	2016-07-26 17:29:07 -07:00
user.c	PM / hibernate: Fix oops at snapshot_write()	2018-07-17 11:37:54 +02:00
wakelock.c	PM / autosleep: Use workqueue for user space wakeup sources garbage collector	2015-07-14 21:04:48 +02:00