Steven Rostedt 9366c1ba13 ring-buffer: Fix race between integrity check and readers ... 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. Cc: stable@vger.kernel.org # 3.6 Signed-off-by: Steven Rostedt <rostedt@goodmis.org>		2012-11-30 11:09:57 -05:00
..
debug	KGDB/KDB fixes and cleanups	2012-10-13 11:16:58 +09:00
events	perf, powerpc: Fix hw breakpoints returning -ENOSPC	2012-10-30 10:07:58 +01:00
gcov
irq	irqdomain: augment add_simple() to allocate descs	2012-10-10 08:57:26 +02:00
power
sched	Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-10-12 22:13:05 +09:00
time	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-10-12 22:17:48 +09:00
trace	ring-buffer: Fix race between integrity check and readers	2012-11-30 11:09:57 -05:00
.gitignore
acct.c	vfs: make path_openat take a struct filename pointer	2012-10-12 20:15:09 -04:00
async.c
audit.c	fs: handle failed audit_log_start properly	2012-10-09 23:33:37 -04:00
audit.h	audit: optimize audit_compare_dname_path	2012-10-12 00:32:02 -04:00
audit_tree.c
audit_watch.c	audit: optimize audit_compare_dname_path	2012-10-12 00:32:02 -04:00
auditfilter.c	audit: optimize audit_compare_dname_path	2012-10-12 00:32:02 -04:00
auditsc.c	audit: make audit_inode take struct filename	2012-10-12 20:15:09 -04:00
backtracetest.c
bounds.c
capability.c
cgroup.c	Revert "cgroup: Remove task_lock() from cgroup_post_fork()"	2012-10-19 14:09:35 -07:00
cgroup_freezer.c
compat.c
configs.c
cpu.c	CPU hotplug, debug: detect imbalance between get_online_cpus() and put_online_cpus()	2012-10-09 16:22:15 +09:00
cpu_pm.c
cpuset.c
crash_dump.c
cred.c
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-10-02 20:25:04 -07:00
extable.c
fork.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal	2012-10-10 12:02:25 +09:00
freezer.c
futex.c
futex_compat.c
groups.c
hrtimer.c
hung_task.c
irq_work.c
itimer.c
jump_label.c
kallsyms.c
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c	kdump: remove unneeded include	2012-10-06 03:05:19 +09:00
kfifo.c
kmod.c	infrastructure for saner ret_from_kernel_thread semantics	2012-10-12 13:35:07 -04:00
kprobes.c
ksysfs.c
kthread.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal	2012-10-13 10:05:52 +09:00
latencytop.c
lglock.c
lockdep.c
lockdep_internals.h
lockdep_proc.c
lockdep_states.h
Makefile	Makefile: Documentation for external tool should be correct	2012-10-25 16:00:53 -07:00
modsign_pubkey.c	MODSIGN: Provide module signing public keys to the kernel	2012-10-10 20:01:22 +10:30
module-internal.h	MODSIGN: Move the magic string to the end of a module and eliminate the search	2012-10-19 17:30:40 -07:00
module.c	MODSIGN: Move the magic string to the end of a module and eliminate the search	2012-10-19 17:30:40 -07:00
module_signing.c	module_signing: fix printk format warning	2012-10-22 08:56:34 +03:00
mutex-debug.c
mutex-debug.h
mutex.c
mutex.h
notifier.c
nsproxy.c
padata.c
panic.c
params.c
pid.c
pid_namespace.c	pidns: limit the nesting depth of pid namespaces	2012-10-25 14:37:53 -07:00
posix-cpu-timers.c
posix-timers.c
printk.c	printk: Fix scheduling-while-atomic problem in console_cpu_notify()	2012-10-16 18:17:44 -07:00
profile.c
ptrace.c
range.c
rcu.h
rcupdate.c
rcutiny.c
rcutiny_plugin.h
rcutorture.c
rcutree.c	rcu: Grace-period initialization excludes only RCU notifier	2012-10-08 09:06:38 -07:00
rcutree.h	rcu: Grace-period initialization excludes only RCU notifier	2012-10-08 09:06:38 -07:00
rcutree_plugin.h	rcu: Make RCU_FAST_NO_HZ handle adaptive ticks	2012-09-26 15:44:02 +02:00
rcutree_trace.c
relay.c
res_counter.c
resource.c	kernel/resource.c: fix stack overflow in __reserve_region_with_split()	2012-10-06 03:05:31 +09:00
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c
rtmutex.h
rtmutex_common.h
rwsem.c
seccomp.c
semaphore.c
signal.c	coredump: pass siginfo_t* to do_coredump() and below, not merely signr	2012-10-06 03:05:16 +09:00
smp.c
smpboot.c
smpboot.h
softirq.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-10-01 10:43:39 -07:00
spinlock.c
srcu.c
stacktrace.c
stop_machine.c
sys.c	use clamp_t in UNAME26 fix	2012-10-19 18:51:17 -07:00
sys_ni.c
sysctl.c	Kconfig: clean up the "#if defined(arch)" list for exception-trace sysctl entry	2012-10-09 16:22:14 +09:00
sysctl_binary.c
task_work.c
taskstats.c	taskstats: cgroupstats_user_cmd() may leak on error	2012-10-06 03:05:31 +09:00
test_kprobes.c
time.c
timeconst.pl
timer.c	timers: Fix endless looping between cascade() and internal_add_timer()	2012-10-09 21:27:14 +02:00
tracepoint.c
tsacct.c
uid16.c
up.c
user-return-notifier.c
user.c
user_namespace.c
utsname.c
utsname_sysctl.c
wait.c
watchdog.c
workqueue.c	workqueue: cancel_delayed_work() should return %false if work item is idle	2012-10-24 12:38:16 -07:00
workqueue_sched.h