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
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blktrace.c	simple_open: automatically convert to simple_open()	2012-04-05 15:25:50 -07:00
ftrace.c	ftrace: Clear bits properly in reset_iter_read()	2012-11-15 16:10:17 -05:00
Kconfig	trace: Stop compiling in trace_clock unconditionally	2012-09-13 22:52:08 -04:00
Makefile	trace: Stop compiling in trace_clock unconditionally	2012-09-13 22:52:08 -04:00
power-traces.c	perf: Clean up power events by introducing new, more generic ones	2011-01-04 08:16:54 +01:00
ring_buffer_benchmark.c	tracing: Use NUMA allocation for per-cpu ring buffer pages	2011-06-14 22:04:39 -04:00
ring_buffer.c	ring-buffer: Fix race between integrity check and readers	2012-11-30 11:09:57 -05:00
rpm-traces.c	PM / Runtime: Introduce trace points for tracing rpm_* functions	2011-09-27 22:53:27 +02:00
trace_branch.c	tracing: Allow events to share their print functions	2010-05-14 14:20:32 -04:00
trace_clock.c	tracing: Add a counter clock for those that do not trust clocks	2011-09-19 11:35:58 -04:00
trace_entries.h	Merge branch 'tip/perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace into perf/urgent	2012-03-24 08:19:09 +01:00
trace_event_perf.c	perf/core improvements and fixes:	2012-08-21 11:27:00 +02:00
trace_events_filter_test.h	tracing/filter: Add startup tests for events filter	2011-08-19 14:35:59 -04:00
trace_events_filter.c	tracing/filter: Add missing initialization	2012-08-07 09:42:47 -04:00
trace_events.c	trace: Move trace event enable from fs_initcall to core_initcall	2012-09-24 14:13:02 -04:00
trace_export.c	tracing: Do not enable function event with enable	2012-05-10 15:55:43 -04:00
trace_functions_graph.c	ftrace: Do not test frame pointers if -mfentry is used	2012-08-23 11:25:29 -04:00
trace_functions.c	1. We no longer ad-hoc to the function tracer "high level" infrastructure	2012-10-07 17:30:50 +09:00
trace_irqsoff.c	ftrace: Add default recursion protection for function tracing	2012-07-31 10:29:52 -04:00
trace_kdb.c	kdb,ftdump: Remove reference to internal kdb include	2010-10-22 15:34:11 -05:00
trace_kprobe.c	perf/trace: Add ability to set a target task for events	2012-07-31 17:02:05 +02:00
trace_mmiotrace.c	atomic: use <linux/atomic.h>	2011-07-26 16:49:47 -07:00
trace_nop.c
trace_output.c	tracing: Register the ftrace internal events during early boot	2012-06-14 15:22:14 -04:00
trace_output.h	tracing: Allow events to share their print functions	2010-05-14 14:20:32 -04:00
trace_printk.c	tracing: Add percpu buffers for trace_printk()	2012-04-23 21:15:55 -04:00
trace_probe.c	tracing: Provide trace events interface for uprobes	2012-05-07 14:30:17 +02:00
trace_probe.h	tracing: Provide trace events interface for uprobes	2012-05-07 14:30:17 +02:00
trace_sched_switch.c	tracing: Remove obsolete sched_switch tracer	2011-02-08 17:14:56 -05:00
trace_sched_wakeup.c	ftrace: Add default recursion protection for function tracing	2012-07-31 10:29:52 -04:00
trace_selftest_dynamic.c	ftrace: Add self-tests for multiple function trace users	2011-05-18 19:24:51 -04:00
trace_selftest.c	tracing: Fix wakeup_rt self test on virtual machines	2012-08-07 09:40:51 -04:00
trace_stack.c	ftrace: Add default recursion protection for function tracing	2012-07-31 10:29:52 -04:00
trace_stat.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
trace_stat.h
trace_syscalls.c	trace: Move trace event enable from fs_initcall to core_initcall	2012-09-24 14:13:02 -04:00
trace_uprobe.c	perf/trace: Add ability to set a target task for events	2012-07-31 17:02:05 +02:00
trace.c	Merge branch 'virtio-next' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux	2012-10-07 21:04:56 +09:00
trace.h	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2012-10-02 11:11:09 -07:00