netdev - Re: [PATCH v2 1/4][next] uapi: socket: Introduce struct sockaddr

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Message-ID: <66641c32-a9fb-4cd6-b910-52d2872fad3d@lunn.ch>
Date: Mon, 28 Oct 2024 21:38:46 +0100
From: Andrew Lunn <andrew@...n.ch>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	Johannes Berg <johannes@...solutions.net>,
	David Ahern <dsahern@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org, Kees Cook <kees@...nel.org>,
	Simon Horman <horms@...nel.org>
Subject: Re: [PATCH v2 1/4][next] uapi: socket: Introduce struct
 sockaddr_legacy

> As this new struct will live in UAPI, to avoid breaking user-space code
> that expects `struct sockaddr`, the `__kernel_sockaddr_legacy` macro is
> introduced. This macro allows us to use either `struct sockaddr` or
> `struct sockaddr_legacy` depending on the context in which the code is
> used: kernel-space or user-space.

Are there cases of userspace API structures where the flexiable array
appears in the middle? I assume this new compiler flag is not only for
use in the kernel? When it gets turned on in user space, will the
kernel headers will again produce warnings? Should we be considering
allowing user space to opt in to using sockaddr_legacy?

    Andrew