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| author | Oleg Nesterov <oleg@redhat.com> | 2013-07-23 17:26:00 +0200 |
|---|---|---|
| committer | Steven Rostedt <rostedt@rostedt.homelinux.com> | 2013-07-24 11:22:51 -0400 |
| commit | 46ef2be0d1d5ccea0c41bb606143586daadd537c (patch) | |
| tree | e924cd0e92231bdf0fa5a37fa8372fe42b319b90 /kernel/trace/trace.c | |
| parent | 15544209cb0b5312e5220a9337a1fe61d1a1f2d9 (diff) | |
| download | linux-stable-46ef2be0d1d5ccea0c41bb606143586daadd537c.tar.gz linux-stable-46ef2be0d1d5ccea0c41bb606143586daadd537c.tar.bz2 linux-stable-46ef2be0d1d5ccea0c41bb606143586daadd537c.zip | |
tracing: Change tracing_buffers_fops to rely on tracing_get_cpu()
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>
Diffstat (limited to 'kernel/trace/trace.c')
| -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 51a99ef2a6e5..30c058a56ffb 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -4949,8 +4949,7 @@ 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; @@ -4969,7 +4968,7 @@ 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; @@ -5576,7 +5575,7 @@ 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); @@ -5589,7 +5588,7 @@ 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 } |