linux-kernel - [PATCH v2 0/4][next] net: Avoid thousands of -Wflex-array-member-not-at-end warnings

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Message-ID: <cover.1729802213.git.gustavoars@kernel.org>
Date: Thu, 24 Oct 2024 15:07:27 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: 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>,
	Simon Horman <horms@...nel.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org, Kees Cook <kees@...nel.org>
Subject: [PATCH v2 0/4][next] net: Avoid thousands of
 -Wflex-array-member-not-at-end warnings

This series aims to resolve thousands of -Wflex-array-member-not-at-end
warnings by introducing `struct sockaddr_legacy`. The intention is to use
it to replace the type of several struct members in the middle of composite
structures, currently of type `struct sockaddr`.

These middle struct members are currently causing thousands of warnings
because `struct sockaddr` contains a flexible-array member, introduced
by commit b5f0de6df6dce ("net: dev: Convert sa_data to flexible array in
struct sockaddR").

The new `struct sockaddr_legacy` doesn't include a flexible-array
member, making it suitable for use as the type of middle members
in composite structs that don't really require the flexible-array
member in `struct sockaddr`, thus avoiding -Wflex-array-member-not-at-end
warnings.

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.

Changes in v2
 - Drop nfsd patch.
 - Move `struct sockaddr_legacy` to include/uapi/linux/socket.h
 - Introduce `__kernel_sockaddr_legacy` macro (Kees)

v1:
 Link: https://lore.kernel.org/linux-hardening/cover.1729037131.git.gustavoars@kernel.org/

Gustavo A. R. Silva (4):
  uapi: socket: Introduce struct sockaddr_legacy
  uapi: wireless: Avoid -Wflex-array-member-not-at-end warnings
  uapi: net: arp: Avoid -Wflex-array-member-not-at-end warnings
  uapi: net: Avoid -Wflex-array-member-not-at-end warnings

 include/net/compat.h          | 30 +++++++++----------
 include/uapi/linux/if_arp.h   | 18 +++++------
 include/uapi/linux/route.h    | 28 +++++++++---------
 include/uapi/linux/socket.h   | 28 ++++++++++++++++++
 include/uapi/linux/wireless.h | 56 +++++++++++++++++------------------
 net/appletalk/ddp.c           |  2 +-
 net/ipv4/af_inet.c            |  2 +-
 net/ipv4/arp.c                |  2 +-
 net/ipv4/fib_frontend.c       |  2 +-
 9 files changed, 98 insertions(+), 70 deletions(-)

-- 
2.34.1