netdev - [PATCH net-next 2/3] rtnl: protect do_setlink from IFLA_XDP

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Message-Id: <1469060555-20250-3-git-send-email-bblanco@plumgrid.com>
Date:	Wed, 20 Jul 2016 17:22:34 -0700
From:	Brenden Blanco <bblanco@...mgrid.com>
To:	davem@...emloft.net, netdev@...r.kernel.org
Cc:	Brenden Blanco <bblanco@...mgrid.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Tariq Toukan <ttoukan.linux@...il.com>
Subject: [PATCH net-next 2/3] rtnl: protect do_setlink from IFLA_XDP_ATTACHED

The IFLA_XDP_ATTACHED nested attribute is meant for read-only, and while
do_setlink properly ignores it, it should be more paranoid and reject
commands that try to set it.

Signed-off-by: Brenden Blanco <bblanco@...mgrid.com>
---
 net/core/rtnetlink.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index eba2b82..189cc78 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2109,6 +2109,10 @@ static int do_setlink(const struct sk_buff *skb,
 		if (err < 0)
 			goto errout;
 
+		if (xdp[IFLA_XDP_ATTACHED]) {
+			err = -EINVAL;
+			goto errout;
+		}
 		if (xdp[IFLA_XDP_FD]) {
 			err = dev_change_xdp_fd(dev,
 						nla_get_s32(xdp[IFLA_XDP_FD]));
-- 
2.8.2