From nobody Mon Nov 25 07:48:28 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 066C8208987; Tue, 29 Oct 2024 21:55:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730238939; cv=none; b=DLccfXcq3ssENZsOYFJ3HbdZEVQaTGERCIXAkNd7c0OZpEx5Fs5+JQCgkVZtQ7Ba/d77CKu5CEblJFifE+2cJbOV5PxhpQ1rDEuyL56L+Xdw3QISkZWUfhzSpg973QzVmuui08s8y04+2LUUFqVc2JHO7n40BupdjMLkg/Kb8jA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730238939; c=relaxed/simple; bh=MRLrmTepWw6yRn2iVG9OiSxDCUDgCrRnrv/CAMIhUb4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=fei/YDm2CIc5SSBSLvI0vUYYwncwV42tbevvvA02Gxvh2KCmXrl6/fzFgBYYpDnUvj5/ixuxnk6Lm41wmVn4S+L9kuMb61lIYYXx9Lkiijpxrx0AN8ScPXLtX8IfZcCDJHW4VuUdwGejfU3XVebA7PW6F3GYmWG5kW7ofPJWzjo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ej++XLRo; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ej++XLRo" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 56331C4CECD; Tue, 29 Oct 2024 21:55:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730238938; bh=MRLrmTepWw6yRn2iVG9OiSxDCUDgCrRnrv/CAMIhUb4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ej++XLRol8clWFkMSB8Wn8h2KkbtUqvN3wxRLth4ZCU6Wxhj58Bcv+3lJjsoTIgCs 93/A5kMvg3ajCWLsNX5T62BAuvdj5euuyNBE+F1rgovxf6wsNBbI3yEU0gHIGCc0wv Lz0i1GSPQnwmNYw5esh7mkimXH8fg4Dv3A7mbcOtIT0GchSFd4xnplKWAntBRFCEWm +cUuJ+LEApzAKSxA2FY/WDZdKDpHawtjECwQqsb+TW/VLI/BykByxZcEhHyTGyFqhB uTfttfpAfE0yUNGzIpOsCrO/1oTIgFGjGsMOMuYG/llBlpfmXzvgmV1RBWszxHtEKl 6U6x56WMtb2nQ== Date: Tue, 29 Oct 2024 15:55:35 -0600 From: "Gustavo A. R. Silva" To: Michael Chan , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Potnuri Bharat Teja , Christian Benvenuti , Satish Kharat , Manish Chopra Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org Subject: [PATCH v2 1/2][next] UAPI: ethtool: Use __struct_group() in struct ethtool_link_settings Message-ID: <9e9fb0bd72e5ba1e916acbb4995b1e358b86a689.1730238285.git.gustavoars@kernel.org> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Use the `__struct_group()` helper to create a new tagged `struct ethtool_link_settings_hdr`. This structure groups together all the members of the flexible `struct ethtool_link_settings` except the flexible array. As a result, the array is effectively separated from the rest of the members without modifying the memory layout of the flexible structure. This new tagged struct will be used to fix problematic declarations of middle-flex-arrays in composite structs[1]. [1] https://git.kernel.org/linus/d88cabfd9abc Signed-off-by: Gustavo A. R. Silva --- Changes in v2: - None. v1: - Link: https://lore.kernel.org/linux-hardening/e9ccb0cd7e490bfa270a7c2097= 9e16ff84ac91e2.1729536776.git.gustavoars@kernel.org/ include/uapi/linux/ethtool.h | 33 ++++++++++++++++++--------------- 1 file changed, 18 insertions(+), 15 deletions(-) diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h index c405ed63acfa..fc1f54b065f9 100644 --- a/include/uapi/linux/ethtool.h +++ b/include/uapi/linux/ethtool.h @@ -2511,21 +2511,24 @@ enum ethtool_reset_flags { * autonegotiation; 0 if unknown or not applicable. Read-only. */ struct ethtool_link_settings { - __u32 cmd; - __u32 speed; - __u8 duplex; - __u8 port; - __u8 phy_address; - __u8 autoneg; - __u8 mdio_support; - __u8 eth_tp_mdix; - __u8 eth_tp_mdix_ctrl; - __s8 link_mode_masks_nwords; - __u8 transceiver; - __u8 master_slave_cfg; - __u8 master_slave_state; - __u8 rate_matching; - __u32 reserved[7]; + /* New members MUST be added within the __struct_group() macro below. */ + __struct_group(ethtool_link_settings_hdr, hdr, /* no attrs */, + __u32 cmd; + __u32 speed; + __u8 duplex; + __u8 port; + __u8 phy_address; + __u8 autoneg; + __u8 mdio_support; + __u8 eth_tp_mdix; + __u8 eth_tp_mdix_ctrl; + __s8 link_mode_masks_nwords; + __u8 transceiver; + __u8 master_slave_cfg; + __u8 master_slave_state; + __u8 rate_matching; + __u32 reserved[7]; + ); __u32 link_mode_masks[]; /* layout of link_mode_masks fields: * __u32 map_supported[link_mode_masks_nwords]; --=20 2.43.0