This is a note to let you know that I've just added the patch titled
tracing: Fix race in snapshot swapping
to the 3.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tracing-fix-race-in-snapshot-swapping.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2721e72dd10f71a3ba90f59781becf02638aa0d9 Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (Red Hat)" <rostedt@xxxxxxxxxxx>
Date: Tue, 12 Mar 2013 11:32:32 -0400
Subject: tracing: Fix race in snapshot swapping
From: "Steven Rostedt (Red Hat)" <rostedt@xxxxxxxxxxx>
commit 2721e72dd10f71a3ba90f59781becf02638aa0d9 upstream.
Although the swap is wrapped with a spin_lock, the assignment
of the temp buffer used to swap is not within that lock.
It needs to be moved into that lock, otherwise two swaps
happening on two different CPUs, can end up using the wrong
temp buffer to assign in the swap.
Luckily, all current callers of the swap function appear to have
their own locks. But in case something is added that allows two
different callers to call the swap, then there's a chance that
this race can trigger and corrupt the buffers.
New code is coming soon that will allow for this race to trigger.
I've Cc'd stable, so this bug will not show up if someone backports
one of the changes that can trigger this bug.
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/trace/trace.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -703,7 +703,7 @@ __update_max_tr(struct trace_array *tr,
void
update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
{
- struct ring_buffer *buf = tr->buffer;
+ struct ring_buffer *buf;
if (trace_stop_count)
return;
@@ -715,6 +715,7 @@ update_max_tr(struct trace_array *tr, st
}
arch_spin_lock(&ftrace_max_lock);
+ buf = tr->buffer;
tr->buffer = max_tr.buffer;
max_tr.buffer = buf;
Patches currently in stable-queue which might be from rostedt@xxxxxxxxxxx are
queue-3.8/tracing-protect-tracer-flags-with-trace_types_lock.patch
queue-3.8/tracing-fix-free-of-probe-entry-by-calling-call_rcu_sched.patch
queue-3.8/tracing-fix-race-in-snapshot-swapping.patch
queue-3.8/tracing-keep-overwrite-in-sync-between-regular-and-snapshot-buffers.patch
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