1 files changed, 3 insertions, 1 deletions

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index a73ebd3b9d4..66e99eb2d8a 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -19,6 +19,7 @@
 #include <linux/security.h>
 #include <linux/signal.h>
 #include <linux/audit.h>
+#include <linux/pid_namespace.h>
 
 #include <asm/pgtable.h>
 #include <asm/uaccess.h>
@@ -443,7 +444,8 @@ struct task_struct *ptrace_get_task_struct(pid_t pid)
                 return ERR_PTR(-EPERM);
 
         read_lock(&tasklist_lock);
-        child = find_task_by_pid(pid);
+        child = find_task_by_pid_ns(pid,
+                        current->nsproxy->pid_ns);
         if (child)
                 get_task_struct(child);