linux-kernel - Re: [PATCH v3 1/9] net: Add struct sockaddr

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Message-ID: <202510230918.AFE383F9E0@keescook>
Date: Thu, 23 Oct 2025 09:20:16 -0700
From: Kees Cook <kees@...nel.org>
To: Paolo Abeni <pabeni@...hat.com>
Cc: Jakub Kicinski <kuba@...nel.org>,
	"Gustavo A. R. Silva" <gustavo@...eddedor.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	John Fastabend <john.fastabend@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Simon Horman <horms@...nel.org>,
	Kuniyuki Iwashima <kuniyu@...gle.com>,
	Willem de Bruijn <willemb@...gle.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH v3 1/9] net: Add struct sockaddr_unspec for sockaddr of
 unknown length

On Thu, Oct 23, 2025 at 12:59:59PM +0200, Paolo Abeni wrote:
> On 10/20/25 11:26 PM, Kees Cook wrote:
> > Add flexible sockaddr structure to support addresses longer than the
> > traditional 14-byte struct sockaddr::sa_data limitation without
> > requiring the full 128-byte sa_data of struct sockaddr_storage. This
> > allows the network APIs to pass around a pointer to an object that
> > isn't lying to the compiler about how big it is, but must be accompanied
> > by its actual size as an additional parameter.
> > 
> > It's possible we may way to migrate to including the size with the
> > struct in the future, e.g.:
> > 
> > struct sockaddr_unspec {
> > 	u16 sa_data_len;
> > 	u16 sa_family;
> > 	u8  sa_data[] __counted_by(sa_data_len);
> > };
> > 
> > Signed-off-by: Kees Cook <kees@...nel.org>
> 
> Another side note: please include the 'net-next' subj prefix in next
> submissions, otherwise patchwork could be fouled, and the patches will
> not be picked by our CI - I guess we need all the possible testing done
> here ;)

Okay, I've tweaked my workflow automation to attempt this now. I had a
bit of a catch-22 in that I generated the CC list after "git
format-patch" (and format-patch is what has the --prefix option, so I
couldn't see if netdev@ was in the CC list yet...) Anyway, it should be
part of my automation now...

-- 
Kees Cook