1 files changed, 19 insertions, 0 deletions

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 3f2cc313ee25..7a932526946f 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -4920,6 +4920,13 @@ static int perf_event_set_output(struct perf_event *event, int output_fd)
         int fput_needed = 0;
         int ret = -EINVAL;
 
+        /*
+         * Don't allow output of inherited per-task events. This would
+         * create performance issues due to cross cpu access.
+         */
+        if (event->cpu == -1 && event->attr.inherit)
+                return -EINVAL;
+
         if (!output_fd)
                 goto set;
 
@@ -4940,6 +4947,18 @@ static int perf_event_set_output(struct perf_event *event, int output_fd)
         if (event->data)
                 goto out;
 
+        /*
+         * Don't allow cross-cpu buffers
+         */
+        if (output_event->cpu != event->cpu)
+                goto out;
+
+        /*
+         * If its not a per-cpu buffer, it must be the same task.
+         */
+        if (output_event->cpu == -1 && output_event->ctx != event->ctx)
+                goto out;
+
         atomic_long_inc(&output_file->f_count);
 
 set: