1 files changed, 8 insertions, 0 deletions

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 6ae62186dd0c..ff5d430d45a7 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -2593,6 +2593,14 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
         long user_extra, extra;
         int ret = 0;
 
+        /*
+         * Don't allow mmap() of inherited per-task counters. This would
+         * create a performance issue due to all children writing to the
+         * same buffer.
+         */
+        if (event->cpu == -1 && event->attr.inherit)
+                return -EINVAL;
+
         if (!(vma->vm_flags & VM_SHARED))
                 return -EINVAL;