netdev - [PATCH net-next v5 4/5] net: bridge: Set strict_start_type for br

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Message-Id: <20231016-fdb_limit-v5-4-32cddff87758@avm.de>
Date: Mon, 16 Oct 2023 15:27:23 +0200
From: Johannes Nixdorf <jnixdorf-oss@....de>
To: "David S. Miller" <davem@...emloft.net>, Andrew Lunn <andrew@...n.ch>, 
 David Ahern <dsahern@...il.com>, Eric Dumazet <edumazet@...gle.com>, 
 Florian Fainelli <f.fainelli@...il.com>, Ido Schimmel <idosch@...dia.com>, 
 Jakub Kicinski <kuba@...nel.org>, Nikolay Aleksandrov <razor@...ckwall.org>, 
 Oleksij Rempel <linux@...pel-privat.de>, Paolo Abeni <pabeni@...hat.com>, 
 Roopa Prabhu <roopa@...dia.com>, Shuah Khan <shuah@...nel.org>, 
 Vladimir Oltean <vladimir.oltean@....com>
Cc: bridge@...ts.linux-foundation.org, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 Johannes Nixdorf <jnixdorf-oss@....de>
Subject: [PATCH net-next v5 4/5] net: bridge: Set strict_start_type for
 br_policy

Set any new attributes added to br_policy to be parsed strictly, to
prevent userspace from passing garbage.

Signed-off-by: Johannes Nixdorf <jnixdorf-oss@....de>
---
 net/bridge/br_netlink.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 0c3cf6e6dea2..5ad4abfcb7ba 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -1229,6 +1229,8 @@ static size_t br_port_get_slave_size(const struct net_device *brdev,
 }

 static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
+	[IFLA_BR_UNSPEC]	= { .strict_start_type =
+				    IFLA_BR_FDB_N_LEARNED },
 	[IFLA_BR_FORWARD_DELAY]	= { .type = NLA_U32 },
 	[IFLA_BR_HELLO_TIME]	= { .type = NLA_U32 },
 	[IFLA_BR_MAX_AGE]	= { .type = NLA_U32 },

-- 
2.42.0