Steven Rostedt 4d7981bfc2 ring-buffer: Fix race between integrity check and readers ... commit 9366c1ba13 upstream. The function rb_check_pages() was added to make sure the ring buffer's pages were sane. This check is done when the ring buffer size is modified as well as when the iterator is released (closing the "trace" file), as that was considered a non fast path and a good place to do a sanity check. The problem is that the check does not have any locks around it. If one process were to read the trace file, and another were to read the raw binary file, the check could happen while the reader is reading the file. The issues with this is that the check requires to clear the HEAD page before doing the full check and it restores it afterward. But readers require the HEAD page to exist before it can read the buffer, otherwise it gives a nasty warning and disables the buffer. By adding the reader lock around the check, this keeps the race from happening. Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2013-01-17 08:50:51 -08:00
..
debug	kdb,vt_console: Fix missed data due to pager overruns	2012-10-21 09:27:59 -07:00
events	perf_event: Switch to internal refcount, fix race with close()	2012-10-02 10:29:54 -07:00
gcov
irq	genirq: Always force thread affinity	2013-01-11 09:06:56 -08:00
power	ftrace: Disable function tracing during suspend/resume and hibernation, again	2012-08-09 08:31:29 -07:00
sched	Revert "sched, autogroup: Stop going ahead if autogroup is disabled"	2012-12-10 10:59:40 -08:00
time	timekeeping: Cast raw_interval to u64 to avoid shift overflow	2012-12-03 11:47:23 -08:00
trace	ring-buffer: Fix race between integrity check and readers	2013-01-17 08:50:51 -08:00
.gitignore
acct.c
async.c	Fix a dead loop in async_synchronize_full()	2012-10-02 10:30:35 -07:00
audit.c	constify path argument of audit_log_d_path()	2012-03-20 21:29:40 -04:00
audit.h
audit_tree.c	audit: fix refcounting in audit-tree	2012-09-14 10:00:18 -07:00
audit_watch.c
auditfilter.c
auditsc.c
backtracetest.c
bounds.c
capability.c
cgroup.c	cgroup: remove incorrect dget/dput() pair in cgroup_create_dir()	2013-01-11 09:06:58 -08:00
cgroup_freezer.c
compat.c	compat: Fix RT signal mask corruption via sigprocmask	2012-05-10 08:58:33 -07:00
configs.c
cpu.c
cpu_pm.c
cpuset.c	CPU hotplug, cpusets, suspend: Don't modify cpusets during suspend/resume	2012-10-13 05:38:57 +09:00
crash_dump.c
cred.c	cred: copy_process() should clear child->replacement_session_keyring	2012-04-11 08:20:11 -07:00
delayacct.c
dma.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
elfcore.c
exec_domain.c
exit.c	posix_types.h: Cleanup stale __NFDBITS and related definitions	2012-08-09 08:31:39 -07:00
extable.c
fork.c	mm/fork: fix overflow in vma length when copying mmap on clone	2012-06-10 00:36:06 +09:00
freezer.c	PM / Freezer: Remove references to TIF_FREEZE in comments	2012-03-04 23:08:54 +01:00
futex.c	futex: avoid wake_futex() for a PI futex_q	2012-12-03 11:47:07 -08:00
futex_compat.c	futex: Mark get_robust_list as deprecated	2012-03-29 11:37:17 +02:00
groups.c
hrtimer.c	hrtimer: Update hrtimer base offsets each hrtimer_interrupt	2012-07-19 08:59:00 -07:00
hung_task.c	hung_task: fix the broken rcu_lock_break() logic	2012-03-05 15:49:42 -08:00
irq_work.c	irq_work: fix compile failure on tile from missing include	2012-04-13 13:15:16 -04:00
itimer.c	itimer: Use printk_once instead of WARN_ONCE	2012-04-10 11:00:30 +02:00
jump_label.c	static keys: Inline the static_key_enabled() function	2012-02-28 20:01:08 +01:00
kallsyms.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks	locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage	2012-03-23 13:18:57 +01:00
Kconfig.preempt	locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage	2012-03-23 13:18:57 +01:00
kexec.c	Merge branch 'akpm' (Andrew's patch-bomb)	2012-03-28 17:19:28 -07:00
kfifo.c
kmod.c	PM / Sleep: Mitigate race between the freezer and request_firmware()	2012-03-28 23:30:28 +02:00
kprobes.c	kprobes: return proper error code from register_kprobe()	2012-03-05 15:49:42 -08:00
ksysfs.c
kthread.c	kthread_worker: reimplement flush_kthread_work() to allow freeing the work item being executed	2012-10-02 10:30:40 -07:00
latencytop.c
lockdep.c	lockdep: Add CPU-idle/offline warning to lockdep-RCU splat	2012-02-21 09:06:06 -08:00
lockdep_internals.h
lockdep_proc.c
lockdep_states.h
Makefile
module.c	module: fix out-by-one error in kallsyms	2012-11-26 11:37:41 -08:00
mutex-debug.c
mutex-debug.h
mutex.c	sched/rt: Use schedule_preempt_disabled()	2012-03-01 10:28:03 +01:00
mutex.h
notifier.c
nsproxy.c
padata.c	padata: Fix cpu hotplug	2012-03-29 19:52:46 +08:00
panic.c	kdump: Execute kmsg_dump(KMSG_DUMP_PANIC) after smp_send_stop()	2012-06-22 11:36:56 -07:00
params.c	params: <level>_initcall-like kernel parameters	2012-03-26 12:50:51 +10:30
pid.c
pid_namespace.c	pidns: add reboot_pid_ns() to handle the reboot syscall	2012-03-28 17:14:36 -07:00
posix-cpu-timers.c
posix-timers.c
printk.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-03-20 10:31:44 -07:00
profile.c
ptrace.c	ptrace: remove PTRACE_SEIZE_DEVEL bit	2012-03-23 16:58:41 -07:00
range.c
rcu.h	rcu: Allow nesting of rcu_idle_enter() and rcu_idle_exit()	2012-02-21 09:06:12 -08:00
rcupdate.c
rcutiny.c	rcu: Add RCU_NONIDLE() for idle-loop RCU read-side critical sections	2012-02-21 09:06:13 -08:00
rcutiny_plugin.h
rcutorture.c	PTR_ERR should be called before its argument is cleared.	2012-02-21 09:06:10 -08:00
rcutree.c	rcu: Fix batch-limit size problem	2012-12-17 10:37:46 -08:00
rcutree.h	rcu: Rework detection of use of RCU by offline CPUs	2012-02-21 09:06:07 -08:00
rcutree_plugin.h	rcu: Hold off RCU_FAST_NO_HZ after timer posted	2012-02-21 09:42:30 -08:00
rcutree_trace.c	rcu: Rework detection of use of RCU by offline CPUs	2012-02-21 09:06:07 -08:00
relay.c	splice: fix racy pipe->buffers uses	2012-07-16 09:04:42 -07:00
res_counter.c
resource.c
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c
rtmutex.h
rtmutex_common.h
rwsem.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
seccomp.c
semaphore.c
signal.c	Disintegrate and delete asm/system.h	2012-03-28 15:58:21 -07:00
smp.c	smp: add func to IPI cpus based on parameter func	2012-03-28 17:14:35 -07:00
softirq.c	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-03-20 10:32:09 -07:00
spinlock.c	locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage	2012-03-23 13:18:57 +01:00
srcu.c	rcu: Call out dangers of expedited RCU primitives	2012-02-21 09:06:08 -08:00
stacktrace.c
stop_machine.c
sys.c	use clamp_t in UNAME26 fix	2012-10-28 10:14:13 -07:00
sys_ni.c
sysctl.c	sysctl: fix write access to dmesg_restrict/kptr_restrict	2012-04-05 14:51:43 +10:00
sysctl_binary.c
taskstats.c
test_kprobes.c
time.c	time: Remove bogus comments	2012-03-15 18:17:55 -07:00
timeconst.pl
timer.c	timers: Fix endless looping between cascade() and internal_add_timer()	2012-10-21 09:27:59 -07:00
tracepoint.c	static keys: Introduce 'struct static_key', static_key_true()/false() and static_key_slow_[inc|dec]()	2012-02-24 10:05:59 +01:00
tsacct.c
uid16.c
up.c
user-return-notifier.c
user.c
user_namespace.c
utsname.c
utsname_sysctl.c
wait.c
watchdog.c	watchdog: using u64 in get_sample_period()	2012-12-03 11:47:17 -08:00
workqueue.c	workqueue: convert BUG_ON()s in __queue_delayed_work() to WARN_ON_ONCE()s	2012-12-17 10:37:43 -08:00
workqueue_sched.h