diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2013-07-23 17:26:00 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-08-29 09:47:32 -0700 |
| commit | 92b6279e284257fb7908bf4d24956f5af13aaa2d (patch) | |
| tree | 1c29b4616adc1d8a979fd56c1aac3d777c443756 /kernel | |
| parent | 23b625fa111e7358ce84672c4444c068b2b1e204 (diff) | |
tracing: Change tracing_buffers_fops to rely on tracing_get_cpu()
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@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/trace.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 8e8bb0e25489..7dcd67332f57 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -4941,8 +4941,7 @@ static const struct file_operations snapshot_raw_fops = { 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 inode *inode, struct file *filp) 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_array *tr, long cpu) &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_array *tr, long cpu) &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 } |