Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Mark Rutland 226424eee8 perf: Fix corruption of sibling list with hotplug ... When a CPU hotplugged out, we call perf_remove_from_context() (via perf_event_exit_cpu()) to rip each CPU-bound event out of its PMU's cpu context, but leave siblings grouped together. Freeing of these events is left to the mercy of the usual refcounting. When a CPU-bound event's refcount drops to zero we cross-call to __perf_remove_from_context() to clean it up, detaching grouped siblings. This works when the relevant CPU is online, but will fail if the CPU is currently offline, and we won't detach the event from its siblings before freeing the event, leaving the sibling list corrupt. If the sibling list is later walked (e.g. because the CPU cam online again before a remaining sibling's refcount drops to zero), we will walk the now corrupted siblings list, potentially dereferencing garbage values. Given that the events should never be scheduled again (as we removed them from their context), we can simply detatch siblings when the CPU goes down in the first place. If the CPU comes back online, the redundant call to __perf_remove_from_context() is safe. Reported-by: Drew Richardson <drew.richardson@arm.com> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: vincent.weaver@maine.edu Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: Will Deacon <will.deacon@arm.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1415203904-25308-2-git-send-email-mark.rutland@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>		2014-11-16 09:45:46 +01:00
..
bpf	bpf: split eBPF out of NET	2014-10-27 19:09:59 -04:00
configs
debug	kdb: replace strnicmp with strncasecmp	2014-10-14 02:18:25 +02:00
events	perf: Fix corruption of sibling list with hotplug	2014-11-16 09:45:46 +01:00
gcov	gcov: add ARM64 to GCOV_PROFILE_ALL	2014-10-29 16:33:14 -07:00
irq	Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2014-10-15 07:48:18 +02:00
locking	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-10-13 15:51:40 +02:00
power	PM / Sleep: fix recovery during resuming from hibernation	2014-10-27 18:42:26 +01:00
printk	Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2014-10-15 07:48:18 +02:00
rcu	rcu: Make rcu_barrier() understand about missing rcuo kthreads	2014-10-28 13:24:13 -07:00
sched	sched/dl: Fix preemption checks	2014-10-28 10:46:10 +01:00
time	clockevents: Prevent shift out of bounds	2014-10-25 10:43:15 +02:00
trace	tracing/syscalls: Ignore numbers outside NR_syscalls' range	2014-10-30 20:58:38 -04:00
.gitignore
acct.c	acct: eliminate compile warning	2014-10-09 22:26:04 -04:00
async.c	kernel/async.c: switch to pr_foo()	2014-10-09 22:26:04 -04:00
audit.c	Merge git://git.infradead.org/users/eparis/audit	2014-10-19 16:25:56 -07:00
audit.h	audit: reduce scope of audit_log_fcaps	2014-09-23 16:37:51 -04:00
audit_tree.c	audit: rename audit_log_remove_rule to disambiguate for trees	2014-10-10 15:30:25 -04:00
audit_watch.c	audit: invalid op= values for rules	2014-09-23 16:37:53 -04:00
auditfilter.c	Merge git://git.infradead.org/users/eparis/audit	2014-10-19 16:25:56 -07:00
auditsc.c	Merge git://git.infradead.org/users/eparis/audit	2014-10-19 16:25:56 -07:00
backtracetest.c
bounds.c
capability.c
cgroup.c	Merge branch 'for-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2014-10-10 07:26:02 -04:00
cgroup_freezer.c
compat.c
configs.c
context_tracking.c	sched: stop the unbound recursion in preempt_schedule_context()	2014-10-28 10:46:05 +01:00
cpu.c	rcu: More on deadlock between CPU hotplug and expedited grace periods	2014-10-23 07:51:17 -07:00
cpu_pm.c
cpuset.c	Merge branch 'for-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2014-10-10 07:24:40 -04:00
crash_dump.c
cred.c
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-10-13 16:23:15 +02:00
extable.c
fork.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-10-13 16:23:15 +02:00
freezer.c	freezer: remove obsolete comments in __thaw_task()	2014-10-21 23:44:20 +02:00
futex.c	futex: Fix a race condition between REQUEUE_PI and task death	2014-10-26 16:16:18 +01:00
futex_compat.c
groups.c
hung_task.c
irq_work.c	Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2014-10-15 07:48:18 +02:00
jump_label.c
kallsyms.c	kernel/kallsyms.c: use __seq_open_private()	2014-10-14 02:18:16 +02:00
kcmp.c	kcmp: fix standard comparison bug	2014-09-10 15:42:12 -07:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c	kexec: remove the unused function parameter	2014-10-14 02:18:21 +02:00
kmod.c	kernel/kmod: fix use-after-free of the sub_info structure	2014-10-29 16:33:14 -07:00
kprobes.c
ksysfs.c
kthread.c	kernel/kthread.c: partial revert of 81c98869fa ("kthread: ensure locality of task_struct allocations")	2014-10-09 22:25:51 -04:00
latencytop.c
Makefile	bpf: split eBPF out of NET	2014-10-27 19:09:59 -04:00
module-internal.h
module.c	A single panic fix for a rare race, stable CC'd.	2014-10-18 10:24:26 -07:00
module_signing.c
notifier.c
nsproxy.c
padata.c
panic.c
params.c	kernel/param: consolidate __{start,stop}___param[] in <linux/moduleparam.h>	2014-10-14 02:18:28 +02:00
pid.c
pid_namespace.c
profile.c
ptrace.c
range.c
reboot.c	kernel: add support for kernel restart handler call chain	2014-09-26 00:00:06 -07:00
relay.c
res_counter.c
resource.c	x86: optimize resource lookups for ioremap	2014-10-14 02:18:22 +02:00
seccomp.c	Merge branch 'x86-seccomp-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-10-14 02:27:06 +02:00
signal.c
smp.c	Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2014-10-15 07:48:18 +02:00
smpboot.c
smpboot.h
softirq.c	Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2014-10-15 07:48:18 +02:00
stacktrace.c
stop_machine.c
sys.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-10-13 16:23:15 +02:00
sys_ni.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2014-10-08 21:40:54 -04:00
sysctl.c	sched/fair: Fix division by zero sysctl_numa_balancing_scan_size	2014-10-28 10:46:04 +01:00
sysctl_binary.c	dmaengine-3.17	2014-10-07 20:39:25 -04:00
system_certificates.S
system_keyring.c
task_work.c
taskstats.c
test_kprobes.c
torture.c	torture: Address race in module cleanup	2014-09-16 13:41:06 -07:00
tracepoint.c
tsacct.c
uid16.c
up.c
user-return-notifier.c
user.c
user_namespace.c
utsname.c
utsname_sysctl.c
watchdog.c	Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2014-10-15 07:48:18 +02:00
workqueue.c	workqueue: Use cond_resched_rcu_qs macro	2014-10-06 05:58:26 -07:00
workqueue_internal.h