1 files changed, 4 insertions, 1 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index aa763ab00777..fb45615943c2 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -322,7 +322,10 @@ static int proc_pid_wchan(struct task_struct *task, char *buffer)
         wchan = get_wchan(task);
 
         if (lookup_symbol_name(wchan, symname) < 0)
-                return sprintf(buffer, "%lu", wchan);
+                if (!ptrace_may_access(task, PTRACE_MODE_READ))
+                        return 0;
+                else
+                        return sprintf(buffer, "%lu", wchan);
         else
                 return sprintf(buffer, "%s", symname);
 }