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tracing: Check pid filtering when creating events

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When pid filtering is activated in an instance, all of the events trace
files for that instance has the PID_FILTER flag set. This determines
whether or not pid filtering needs to be done on the event, otherwise the
event is executed as normal.

If pid filtering is enabled when an event is created (via a dynamic event
or modules), its flag is not updated to reflect the current state, and the
events are not filtered properly.

Cc: stable@vger.kernel.org
Fixes: 3fdaf80f4a ("tracing: Implement event pid filtering")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2021-11-26 13:35:26 -05:00
parent 1880ed71ce
commit 6cb206508b
1 changed files with 12 additions and 0 deletions
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12
kernel/trace/trace_events.c
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@ -2678,12 +2678,24 @@ static struct trace_event_file *
trace_create_new_event(struct trace_event_call *call,
struct trace_array *tr)
{
struct trace_pid_list *no_pid_list;
struct trace_pid_list *pid_list;
struct trace_event_file *file;
unsigned int first;
file = kmem_cache_alloc(file_cachep, GFP_TRACE);
if (!file)
return NULL;
pid_list = rcu_dereference_protected(tr->filtered_pids,
lockdep_is_held(&event_mutex));
no_pid_list = rcu_dereference_protected(tr->filtered_no_pids,
lockdep_is_held(&event_mutex));
if (!trace_pid_list_first(pid_list, &first) ||
!trace_pid_list_first(pid_list, &first))
file->flags |= EVENT_FILE_FL_PID_FILTER;
file->event_call = call;
file->tr = tr;
atomic_set(&file->sm_ref, 0);