This is a note to let you know that I've just added the patch titled
tracing: Change tracing_buffers_fops to rely on tracing_get_cpu()
to the 3.10-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-change-tracing_buffers_fops-to-rely-on-tracing_get_cpu.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 46ef2be0d1d5ccea0c41bb606143586daadd537c Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Date: Tue, 23 Jul 2013 17:26:00 +0200
Subject: tracing: Change tracing_buffers_fops to rely on tracing_get_cpu()
From: Oleg Nesterov <oleg@xxxxxxxxxx>
commit 46ef2be0d1d5ccea0c41bb606143586daadd537c upstream.
tracing_buffers_open() is racy, the memory inode->i_private points
to can be already freed.
Change debugfs_create_file("trace_pipe_raw", data) caller to pass
"data = tr", tracing_buffers_open() can use tracing_get_cpu().
Change debugfs_create_file("snapshot_raw_fops", data) caller too,
this file uses tracing_buffers_open/release.
Link: http://lkml.kernel.org/r/20130723152600.GA23720@xxxxxxxxxx
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/trace/trace.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4941,8 +4941,7 @@ static const struct file_operations snap
static int tracing_buffers_open(struct inode *inode, struct file *filp)
{
- struct trace_cpu *tc = inode->i_private;
- struct trace_array *tr = tc->tr;
+ struct trace_array *tr = inode->i_private;
struct ftrace_buffer_info *info;
int ret;
@@ -4961,7 +4960,7 @@ static int tracing_buffers_open(struct i
mutex_lock(&trace_types_lock);
info->iter.tr = tr;
- info->iter.cpu_file = tc->cpu;
+ info->iter.cpu_file = tracing_get_cpu(inode);
info->iter.trace = tr->current_trace;
info->iter.trace_buffer = &tr->trace_buffer;
info->spare = NULL;
@@ -5568,7 +5567,7 @@ tracing_init_debugfs_percpu(struct trace
&data->trace_cpu, cpu, &tracing_fops);
trace_create_cpu_file("trace_pipe_raw", 0444, d_cpu,
- &data->trace_cpu, cpu, &tracing_buffers_fops);
+ tr, cpu, &tracing_buffers_fops);
trace_create_cpu_file("stats", 0444, d_cpu,
&data->trace_cpu, cpu, &tracing_stats_fops);
@@ -5581,7 +5580,7 @@ tracing_init_debugfs_percpu(struct trace
&data->trace_cpu, cpu, &snapshot_fops);
trace_create_cpu_file("snapshot_raw", 0444, d_cpu,
- &data->trace_cpu, cpu, &snapshot_raw_fops);
+ tr, cpu, &snapshot_raw_fops);
#endif
}
Patches currently in stable-queue which might be from oleg@xxxxxxxxxx are
queue-3.10/tracing-introduce-trace_create_cpu_file-and.patch
queue-3.10/tracing-change-tracing_fops-snapshot_fops-to-rely-on-tracing_get_cpu.patch
queue-3.10/tracing-change-tracing_buffers_fops-to-rely-on-tracing_get_cpu.patch
queue-3.10/tracing-change-tracing_stats_fops-to-rely-on.patch
queue-3.10/tracing-change-tracing_pipe_fops-to-rely-on-tracing_get_cpu.patch
queue-3.10/tracing-change-tracing_entries_fops-to-rely-on-tracing_get_cpu.patch
queue-3.10/tracing-turn-event-id-i_private-into-call-event.type.patch
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