From e45632c9f8bbd8980c53503a767a68766489cba0 Mon Sep 17 00:00:00 2001
From: Masamichi Takagi <masamichi.takagi@riken.jp>
Date: Thu, 4 Sep 2014 17:28:14 +0900
Subject: [PATCH] Check "options" argument in wait4

Make wait4 return -EINVAL when not supported options are requested.
---
 kernel/syscall.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/syscall.c b/kernel/syscall.c
index b61c74a4..77cecc81 100644
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@@ -311,6 +311,9 @@ SYSCALL_DECLARE(wait4)
 	struct waitq_entry waitpid_wqe;
 	int empty = 1;
 
+    if (options & ~(WNOHANG | WUNTRACED | WCONTINUED)) {
+        return -EINVAL;
+    }
 rescan:
 	child = NULL;
 	pid = (int)ihk_mc_syscall_arg0(ctx);