From 823707b68d6e6c4b1be619b039c7045fef1740e6 Mon Sep 17 00:00:00 2001
From: Alexei Starovoitov <ast@fb.com>
Date: Mon, 7 Mar 2016 21:57:16 -0800
Subject: bpf: check for reserved flag bits in array and stack maps

Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 kernel/bpf/stackmap.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'kernel/bpf/stackmap.c')

diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index 8a60ee14a977..f0a02c344358 100644
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -35,6 +35,9 @@ static struct bpf_map *stack_map_alloc(union bpf_attr *attr)
 	if (!capable(CAP_SYS_ADMIN))
 		return ERR_PTR(-EPERM);
 
+	if (attr->map_flags)
+		return ERR_PTR(-EINVAL);
+
 	/* check sanity of attributes */
 	if (attr->max_entries == 0 || attr->key_size != 4 ||
 	    value_size < 8 || value_size % 8 ||
-- 
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