netdev - Re: [PATCH 1/6 net-next] net: uapi: Add __kernel_sockaddr

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Message-ID: <20250724144046.36dd3611@kernel.org>
Date: Thu, 24 Jul 2025 14:40:46 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Kees Cook <kees@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Simon Horman
 <horms@...nel.org>, Kuniyuki Iwashima <kuniyu@...gle.com>, Willem de Bruijn
 <willemb@...gle.com>, netdev@...r.kernel.org
Subject: Re: [PATCH 1/6 net-next] net: uapi: Add __kernel_sockaddr_unspec
 for sockaddr of unknown length

On Wed, 23 Jul 2025 16:19:08 -0700 Kees Cook wrote:
> I added this to UAPI in the hopes that it could also be used for any
> future "arbitrarily sized" sockaddr needs. But it may be better to
> use a different UAPI with an explicit size member:
> 
> struct sockaddr_unspec {
> 	u16 sa_data_len;
> 	u16 sa_family;
> 	u8  sa_data[] __counted_by(sa_data_len);
> };

Right, not sure how likely we are to add completely new future APIs 
that take sockaddr directly. Most new interfaces will be wrapped in
Netlink. I may be missing the point but the need to add this struct
in uAPI right now is not obvious to me.