1 files changed, 4 insertions, 3 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index c9eaf2013002..3561391ca450 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1173,10 +1173,11 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 return ERR_PTR(-EINVAL);
 
         /*
-         * If the new process will be in a different pid namespace
-         * don't allow the creation of threads.
+         * If the new process will be in a different pid namespace don't
+         * allow it to share a thread group or signal handlers with the
+         * forking task.
          */
-        if ((clone_flags & (CLONE_VM|CLONE_NEWPID)) &&
+        if ((clone_flags & (CLONE_SIGHAND | CLONE_NEWPID)) &&
             (task_active_pid_ns(current) !=
              current->nsproxy->pid_ns_for_children))
                 return ERR_PTR(-EINVAL);