netdev - Re: [PATCH net-next v4 2/6] net: bridge: Set strict_start_type for br

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Date: Wed, 20 Sep 2023 13:46:02 +0300
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: Johannes Nixdorf <jnixdorf-oss@....de>,
 "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>, 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
Subject: Re: [PATCH net-next v4 2/6] net: bridge: Set strict_start_type for
 br_policy

On 9/19/23 11:12, Johannes Nixdorf wrote:
> 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 10f0d33d8ccf..505683ef9a26 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_MCAST_QUERIER_STATE + 1 },
>   	[IFLA_BR_FORWARD_DELAY]	= { .type = NLA_U32 },
>   	[IFLA_BR_HELLO_TIME]	= { .type = NLA_U32 },
>   	[IFLA_BR_MAX_AGE]	= { .type = NLA_U32 },
> 

instead of IFLA_BR_MCAST_QUERIER_STATE + 1, why not move around the 
patch and just use the new attribute name?
These are uapi, they won't change.