From nobody Fri Nov 22 16:38:01 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 29ABF1E1C03; Fri, 15 Nov 2024 20:43:12 +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=1731703392; cv=none; b=R7mui4qe+vYq9aqvk/4wc9AbpvMtXR1ct58VxfTpIWWOuQCgRDFs3UbtiLw0G5OgVrHuvwcJsihlHx//Na5eWEjCtfzNtEJp9X9Zk9HOeCeMOuEWFukU0jpwHDJzvb+nThVmjg/sGezMhNxomedW66edB24pNJjYjn7IprasxzU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731703392; c=relaxed/simple; bh=XLhDTh1a0RlNEhdf185AQJjpHS1kO/YS0NoMJwKDK5U=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=YecCdjjEwZqjoE37Wk1KHieXWS6tv2lkQy06YVEIaMqkLpMTKPewO0HQO7jxw0dokNSICnut/tN9xnDGtLz3+DLrGYyDitIKkV2N7dT9Bbs0hPXahjMd7fRn+Uvshjet7ISsv+knawDqw39TzQECGoyh5UZTKBXFS9pjbhG82Pw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Tm8m68M2; 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="Tm8m68M2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CC096C4AF09; Fri, 15 Nov 2024 20:43:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1731703391; bh=XLhDTh1a0RlNEhdf185AQJjpHS1kO/YS0NoMJwKDK5U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Tm8m68M2sXmiIaaghoRkb9xgH8AldtLdOyJ4Ock0V1j7q23c9F9YXwxXupFKe1YBl t72qKAiy+ho61d2ZJuHqaPH2smilJKq6M25YckvbiU8pnNtOjU/cylAss/frr76Gu4 v/VrL3W1CaQHhpk+i9lFgtQSCfZxzUwRNV69TiF11ud0m7SAta2HHCQVZa+kUp5XJ+ T7rMsyfdsva7V26456V1cqv69WZqc0k60tvufr/1ESQVjBKHH7nEAIQptHRBFCuv8V PQ2jIcH0VbEN5E5XEq2Vf+0uHtvFDFMSqG5LKKPI3aaiTJ37YTrG+KvX+x9BrPVLrQ h3KPnoAfsbUmQ== From: Kees Cook To: Jakub Kicinski Cc: Kees Cook , "Gustavo A. R. Silva" , "David S. Miller" , Andrew Lunn , "Kory Maincent (Dent Project)" , Michael Chan , Andrew Lunn , Eric Dumazet , Paolo Abeni , Potnuri Bharat Teja , Christian Benvenuti , Satish Kharat , Manish Chopra , Simon Horman , Edward Cree , Przemek Kitszel , Heiner Kallweit , Ahmed Zaki , Rahul Rameshbabu , Ido Schimmel , Maxime Chevallier , Takeru Hayasaka , Jonathan Corbet , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH 1/3] Revert "net: ethtool: Avoid thousands of -Wflex-array-member-not-at-end warnings" Date: Fri, 15 Nov 2024 12:43:03 -0800 Message-Id: <20241115204308.3821419-1-kees@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241115204115.work.686-kees@kernel.org> References: <20241115204115.work.686-kees@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=10698; i=kees@kernel.org; h=from:subject; bh=XLhDTh1a0RlNEhdf185AQJjpHS1kO/YS0NoMJwKDK5U=; b=owGbwMvMwCVmps19z/KJym7G02pJDOnmmyJ4HefI33+UWRVqdumNbGRw/c8z3w/pZRxW6322O SA7V2FnRykLgxgXg6yYIkuQnXuci8fb9nD3uYowc1iZQIYwcHEKwEScnzIyzM8OEX0ew2Ep8fyI JVNQzT+tr3/vverrCTA5LMqfV8+Yxshw6ceyV7cj3z0yudLA88TA5vU5qwPxKVn//T+K/b95oMa dAwA= X-Developer-Key: i=kees@kernel.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This reverts commit 3bd9b9abdf1563a22041b7255baea6d449902f1a. We cannot use the new tagged struct group because it throws C++ errors even under "extern C". Signed-off-by: Kees Cook --- Cc: "Gustavo A. R. Silva" --- .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 6 +++--- .../net/ethernet/chelsio/cxgb4/cxgb4_ethtool.c | 4 ++-- .../ethernet/chelsio/cxgb4vf/cxgb4vf_main.c | 2 +- drivers/net/ethernet/cisco/enic/enic_ethtool.c | 2 +- .../net/ethernet/qlogic/qede/qede_ethtool.c | 4 ++-- include/linux/ethtool.h | 2 +- net/ethtool/ioctl.c | 2 +- net/ethtool/linkinfo.c | 8 ++++---- net/ethtool/linkmodes.c | 18 +++++++----------- 9 files changed, 22 insertions(+), 26 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/ne= t/ethernet/broadcom/bnxt/bnxt_ethtool.c index cfd2c65b1c90..061a40b1974b 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c @@ -2780,7 +2780,7 @@ u32 bnxt_fw_to_ethtool_speed(u16 fw_link_speed) static void bnxt_get_default_speeds(struct ethtool_link_ksettings *lk_kset= tings, struct bnxt_link_info *link_info) { - struct ethtool_link_settings_hdr *base =3D &lk_ksettings->base; + struct ethtool_link_settings *base =3D &lk_ksettings->base; =20 if (link_info->link_state =3D=3D BNXT_LINK_STATE_UP) { base->speed =3D bnxt_fw_to_ethtool_speed(link_info->link_speed); @@ -2799,7 +2799,7 @@ static void bnxt_get_default_speeds(struct ethtool_li= nk_ksettings *lk_ksettings, static int bnxt_get_link_ksettings(struct net_device *dev, struct ethtool_link_ksettings *lk_ksettings) { - struct ethtool_link_settings_hdr *base =3D &lk_ksettings->base; + struct ethtool_link_settings *base =3D &lk_ksettings->base; enum ethtool_link_mode_bit_indices link_mode; struct bnxt *bp =3D netdev_priv(dev); struct bnxt_link_info *link_info; @@ -3022,9 +3022,9 @@ u16 bnxt_get_fw_auto_link_speeds(const unsigned long = *mode) static int bnxt_set_link_ksettings(struct net_device *dev, const struct ethtool_link_ksettings *lk_ksettings) { - const struct ethtool_link_settings_hdr *base =3D &lk_ksettings->base; struct bnxt *bp =3D netdev_priv(dev); struct bnxt_link_info *link_info =3D &bp->link_info; + const struct ethtool_link_settings *base =3D &lk_ksettings->base; bool set_pause =3D false; u32 speed, lanes =3D 0; int rc =3D 0; diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ethtool.c b/drivers/n= et/ethernet/chelsio/cxgb4/cxgb4_ethtool.c index 45d28a65347e..7f3f5afa864f 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ethtool.c +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ethtool.c @@ -662,8 +662,8 @@ static unsigned int lmm_to_fw_caps(const unsigned long = *link_mode_mask) static int get_link_ksettings(struct net_device *dev, struct ethtool_link_ksettings *link_ksettings) { - struct ethtool_link_settings_hdr *base =3D &link_ksettings->base; struct port_info *pi =3D netdev_priv(dev); + struct ethtool_link_settings *base =3D &link_ksettings->base; =20 /* For the nonce, the Firmware doesn't send up Port State changes * when the Virtual Interface attached to the Port is down. So @@ -717,9 +717,9 @@ static int get_link_ksettings(struct net_device *dev, static int set_link_ksettings(struct net_device *dev, const struct ethtool_link_ksettings *link_ksettings) { - const struct ethtool_link_settings_hdr *base =3D &link_ksettings->base; struct port_info *pi =3D netdev_priv(dev); struct link_config *lc =3D &pi->link_cfg; + const struct ethtool_link_settings *base =3D &link_ksettings->base; struct link_config old_lc; unsigned int fw_caps; int ret =3D 0; diff --git a/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c b/drivers/= net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c index 61d08547e3f9..2fbe0f059a0b 100644 --- a/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c +++ b/drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c @@ -1436,8 +1436,8 @@ static void fw_caps_to_lmm(enum fw_port_type port_typ= e, static int cxgb4vf_get_link_ksettings(struct net_device *dev, struct ethtool_link_ksettings *link_ksettings) { - struct ethtool_link_settings_hdr *base =3D &link_ksettings->base; struct port_info *pi =3D netdev_priv(dev); + struct ethtool_link_settings *base =3D &link_ksettings->base; =20 /* For the nonce, the Firmware doesn't send up Port State changes * when the Virtual Interface attached to the Port is down. So diff --git a/drivers/net/ethernet/cisco/enic/enic_ethtool.c b/drivers/net/e= thernet/cisco/enic/enic_ethtool.c index 4fe85780a950..f7986f2b6a17 100644 --- a/drivers/net/ethernet/cisco/enic/enic_ethtool.c +++ b/drivers/net/ethernet/cisco/enic/enic_ethtool.c @@ -129,8 +129,8 @@ static void enic_intr_coal_set_rx(struct enic *enic, u3= 2 timer) static int enic_get_ksettings(struct net_device *netdev, struct ethtool_link_ksettings *ecmd) { - struct ethtool_link_settings_hdr *base =3D &ecmd->base; struct enic *enic =3D netdev_priv(netdev); + struct ethtool_link_settings *base =3D &ecmd->base; =20 ethtool_link_ksettings_add_link_mode(ecmd, supported, 10000baseT_Full); diff --git a/drivers/net/ethernet/qlogic/qede/qede_ethtool.c b/drivers/net/= ethernet/qlogic/qede/qede_ethtool.c index c553da16d4b1..e50e1df0a433 100644 --- a/drivers/net/ethernet/qlogic/qede/qede_ethtool.c +++ b/drivers/net/ethernet/qlogic/qede/qede_ethtool.c @@ -504,7 +504,7 @@ static int qede_get_link_ksettings(struct net_device *d= ev, struct ethtool_link_ksettings *cmd) { typeof(cmd->link_modes) *link_modes =3D &cmd->link_modes; - struct ethtool_link_settings_hdr *base =3D &cmd->base; + struct ethtool_link_settings *base =3D &cmd->base; struct qede_dev *edev =3D netdev_priv(dev); struct qed_link_output current_link; =20 @@ -537,7 +537,7 @@ static int qede_get_link_ksettings(struct net_device *d= ev, static int qede_set_link_ksettings(struct net_device *dev, const struct ethtool_link_ksettings *cmd) { - const struct ethtool_link_settings_hdr *base =3D &cmd->base; + const struct ethtool_link_settings *base =3D &cmd->base; const struct ethtool_forced_speed_map *map; struct qede_dev *edev =3D netdev_priv(dev); struct qed_link_output current_link; diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h index 1199e308c8dd..12f6dc567598 100644 --- a/include/linux/ethtool.h +++ b/include/linux/ethtool.h @@ -211,7 +211,7 @@ void ethtool_rxfh_context_lost(struct net_device *dev, = u32 context_id); * fields, but they are allowed to overwrite them (will be ignored). */ struct ethtool_link_ksettings { - struct ethtool_link_settings_hdr base; + struct ethtool_link_settings base; struct { __ETHTOOL_DECLARE_LINK_MODE_MASK(supported); __ETHTOOL_DECLARE_LINK_MODE_MASK(advertising); diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c index 7da94e26ced6..5cc131cdb1bc 100644 --- a/net/ethtool/ioctl.c +++ b/net/ethtool/ioctl.c @@ -425,7 +425,7 @@ convert_link_ksettings_to_legacy_settings( =20 /* layout of the struct passed from/to userland */ struct ethtool_link_usettings { - struct ethtool_link_settings_hdr base; + struct ethtool_link_settings base; struct { __u32 supported[__ETHTOOL_LINK_MODE_MASK_NU32]; __u32 advertising[__ETHTOOL_LINK_MODE_MASK_NU32]; diff --git a/net/ethtool/linkinfo.c b/net/ethtool/linkinfo.c index 2d5bc57160be..30b8ce275159 100644 --- a/net/ethtool/linkinfo.c +++ b/net/ethtool/linkinfo.c @@ -8,9 +8,9 @@ struct linkinfo_req_info { }; =20 struct linkinfo_reply_data { - struct ethnl_reply_data base; - struct ethtool_link_ksettings ksettings; - struct ethtool_link_settings_hdr *lsettings; + struct ethnl_reply_data base; + struct ethtool_link_ksettings ksettings; + struct ethtool_link_settings *lsettings; }; =20 #define LINKINFO_REPDATA(__reply_base) \ @@ -98,7 +98,7 @@ static int ethnl_set_linkinfo(struct ethnl_req_info *req_info, struct genl_info *info) { struct ethtool_link_ksettings ksettings =3D {}; - struct ethtool_link_settings_hdr *lsettings; + struct ethtool_link_settings *lsettings; struct net_device *dev =3D req_info->dev; struct nlattr **tb =3D info->attrs; bool mod =3D false; diff --git a/net/ethtool/linkmodes.c b/net/ethtool/linkmodes.c index 17e49cf89f03..259cd9ef1f2a 100644 --- a/net/ethtool/linkmodes.c +++ b/net/ethtool/linkmodes.c @@ -11,10 +11,10 @@ struct linkmodes_req_info { }; =20 struct linkmodes_reply_data { - struct ethnl_reply_data base; - struct ethtool_link_ksettings ksettings; - struct ethtool_link_settings_hdr *lsettings; - bool peer_empty; + struct ethnl_reply_data base; + struct ethtool_link_ksettings ksettings; + struct ethtool_link_settings *lsettings; + bool peer_empty; }; =20 #define LINKMODES_REPDATA(__reply_base) \ @@ -62,12 +62,10 @@ static int linkmodes_reply_size(const struct ethnl_req_= info *req_base, { const struct linkmodes_reply_data *data =3D LINKMODES_REPDATA(reply_base); const struct ethtool_link_ksettings *ksettings =3D &data->ksettings; + const struct ethtool_link_settings *lsettings =3D &ksettings->base; bool compact =3D req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS; - const struct ethtool_link_settings_hdr *lsettings; int len, ret; =20 - lsettings =3D &ksettings->base; - len =3D nla_total_size(sizeof(u8)) /* LINKMODES_AUTONEG */ + nla_total_size(sizeof(u32)) /* LINKMODES_SPEED */ + nla_total_size(sizeof(u32)) /* LINKMODES_LANES */ @@ -105,12 +103,10 @@ static int linkmodes_fill_reply(struct sk_buff *skb, { const struct linkmodes_reply_data *data =3D LINKMODES_REPDATA(reply_base); const struct ethtool_link_ksettings *ksettings =3D &data->ksettings; + const struct ethtool_link_settings *lsettings =3D &ksettings->base; bool compact =3D req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS; - const struct ethtool_link_settings_hdr *lsettings; int ret; =20 - lsettings =3D &ksettings->base; - if (nla_put_u8(skb, ETHTOOL_A_LINKMODES_AUTONEG, lsettings->autoneg)) return -EMSGSIZE; =20 @@ -241,7 +237,7 @@ static int ethnl_update_linkmodes(struct genl_info *inf= o, struct nlattr **tb, struct ethtool_link_ksettings *ksettings, bool *mod, const struct net_device *dev) { - struct ethtool_link_settings_hdr *lsettings =3D &ksettings->base; + struct ethtool_link_settings *lsettings =3D &ksettings->base; bool req_speed, req_lanes, req_duplex; const struct nlattr *master_slave_cfg, *lanes_cfg; int ret; --=20 2.34.1 From nobody Fri Nov 22 16:38:01 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 29B6D1E2848; Fri, 15 Nov 2024 20:43:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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Fri, 15 Nov 2024 20:43:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1731703391; bh=HMpjdv/bdsXxaQkhI5GYNDu/DBHhpSw2rmWGbNPhfqc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PeLpSbuER+I2/r5q3PCIifda93s7fpLsXNBI4oQZu8p6/mR4+AboBV1Z3DydsHhPs PQSLm/ZAf14MkoGv4OkMWZmlYgnoXBavzf9DpnT/MyHRbPxar+SVRC94Rt9a+zBT3h Fh+eNi0KAM/BxRNfDQqKlD/KGmyghXBzLXNl6bkSdMMh0lQ0xr+nCOX/rXHwGI8rzj InrfH5SbefkXsWh7UW4fPaQn8pa82VgqMHRqOGQpqZHGdWVxlhpSTuNeBB0kmN1u8M OeCybIZUsn95+p9JjlvWIVjpOKdup/5D/FX57nf6Yq6JC4X5Zvc7OSLM5btdBtdEUe TLWqSbxCIQ8XA== From: Kees Cook To: Jakub Kicinski Cc: Kees Cook , "Gustavo A. R. Silva" , "David S. Miller" , Andrew Lunn , "Kory Maincent (Dent Project)" , Michael Chan , Andrew Lunn , Eric Dumazet , Paolo Abeni , Potnuri Bharat Teja , Christian Benvenuti , Satish Kharat , Manish Chopra , Simon Horman , Edward Cree , Przemek Kitszel , Heiner Kallweit , Ahmed Zaki , Rahul Rameshbabu , Ido Schimmel , Maxime Chevallier , Takeru Hayasaka , Jonathan Corbet , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH 2/3] Revert "UAPI: ethtool: Use __struct_group() in struct ethtool_link_settings" Date: Fri, 15 Nov 2024 12:43:04 -0800 Message-Id: <20241115204308.3821419-2-kees@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241115204115.work.686-kees@kernel.org> References: <20241115204115.work.686-kees@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1676; i=kees@kernel.org; h=from:subject; bh=HMpjdv/bdsXxaQkhI5GYNDu/DBHhpSw2rmWGbNPhfqc=; b=owGbwMvMwCVmps19z/KJym7G02pJDOnmmyIk8r96VO2KE5lgtGfjl99Fb6peaZ7ktyqKmfJ+V jub01+fjlIWBjEuBlkxRZYgO/c4F4+37eHucxVh5rAygQxh4OIUgIlMZGP4w/3sYMXytXM8bpbd 28AvGNAnYnvCVYX3bE7P5ND56RLNrxgZji2dM/tCs+lu/kM8P/XCn80ySo9O2MSys6uepVv3CX8 bEwA= X-Developer-Key: i=kees@kernel.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This reverts commit 43d3487035e9a86fad952de4240a518614240d43. We cannot use tagged struct groups in UAPI because C++ will throw syntax errors even under "extern C". Signed-off-by: Kees Cook --- Cc: "Gustavo A. R. Silva" --- include/uapi/linux/ethtool.h | 33 +++++++++++++++------------------ 1 file changed, 15 insertions(+), 18 deletions(-) diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h index fc1f54b065f9..c405ed63acfa 100644 --- a/include/uapi/linux/ethtool.h +++ b/include/uapi/linux/ethtool.h @@ -2511,24 +2511,21 @@ enum ethtool_reset_flags { * autonegotiation; 0 if unknown or not applicable. Read-only. */ struct ethtool_link_settings { - /* 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 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 2.34.1 From nobody Fri Nov 22 16:38:01 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 29B181E2847; Fri, 15 Nov 2024 20:43:12 +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=1731703392; cv=none; b=ZhNPVr07S3L20vtHjIpr0ALkg5IWqHNfNAhq6oQjTw97t2XVC6/E/5SScBEQxS6Wcd2PlMu70vAREqMVRFUW0I9tWl/91drNtBRPdxL6lNm8WUOy6wBSMfDYuYSNKWkvPDLIIEQgXg8n9AGVDB0JUrx4zJU0lx1+mHIYgBiyRQw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731703392; c=relaxed/simple; bh=L/nAji/np5Nj6xf7xzKtv5APFH3Nk1mvKh//Dch+LcI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=doGlFqBsL2ztZGjUekXpaslZZ6A9gowccu63edOO0zW8b5ZidHSljpTm7J0sgoWytRgFg4qS+8fHYczS1bfr+mdmSWx7Kr0mgoa5WJMIoM/49vs3/ch4VKenKwbQqnqaglGoBAzhc9jfdaTYcpvhdu8Ron/BBzeQOaQxJOo7Ruc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=IOsDsKku; 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="IOsDsKku" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CE64EC4AF0C; Fri, 15 Nov 2024 20:43:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1731703391; bh=L/nAji/np5Nj6xf7xzKtv5APFH3Nk1mvKh//Dch+LcI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IOsDsKkuZ+ZyjsSoSsCn+85NzTnmSMnmohrt00YCpzx4TRL4vuazPXQDpKah0KOXb /fqEAcU+0Ce7z82qnrykHwLvwlDmDtqRgBopZPK98Krx672Zwi8sZXr0UseASrIraB o32U+ipKCAmIsM9qe/so6Oo117VqbhuHmyhhNj50uCsOtN0Mtg+ZW7XCA8khzuCBS5 pf7prAFf7gL5Df4Qt7N9g9ZVNDswpvDc4JZybPAPNauJGCCFj/1W0FnT6ITU9aO3II 3SmWI8+ucoQ0yjVogdneZNdWNWwAUizlWLBd/eI2guOj4wAMt3keNF36FBwYhdWlhI MYLhiU9ktzOaQ== From: Kees Cook To: Jakub Kicinski Cc: Kees Cook , "Gustavo A. R. Silva" , "David S. Miller" , Andrew Lunn , "Kory Maincent (Dent Project)" , Michael Chan , Andrew Lunn , Eric Dumazet , Paolo Abeni , Potnuri Bharat Teja , Christian Benvenuti , Satish Kharat , Manish Chopra , Simon Horman , Edward Cree , Przemek Kitszel , Heiner Kallweit , Ahmed Zaki , Rahul Rameshbabu , Ido Schimmel , Maxime Chevallier , Takeru Hayasaka , Jonathan Corbet , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH 3/3] UAPI: ethtool: Avoid flex-array in struct ethtool_link_settings Date: Fri, 15 Nov 2024 12:43:05 -0800 Message-Id: <20241115204308.3821419-3-kees@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241115204115.work.686-kees@kernel.org> References: <20241115204115.work.686-kees@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2442; i=kees@kernel.org; h=from:subject; bh=L/nAji/np5Nj6xf7xzKtv5APFH3Nk1mvKh//Dch+LcI=; b=owGbwMvMwCVmps19z/KJym7G02pJDOnmmyLLWeIEXxh2FPs/3pJ5xlSy/cH/+nD+vuwjP2acn vV9zwzTjlIWBjEuBlkxRZYgO/c4F4+37eHucxVh5rAygQxh4OIUgIl8OMzwv0LhZLfx5y1aZana Uw7Xrnn0qNHML3P/3bo1+RaHrqxbJsPIsLFC5cDyritFW38Hc1SeuVE77Xr1IY2NcaJ+W3kXT/5 7hQcA X-Developer-Key: i=kees@kernel.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" struct ethtool_link_settings tends to be used as a header for other structures that have trailing bytes[1], but has a trailing flexible array itself. Using this overlapped with other structures leads to ambiguous object sizing in the compiler, so we want to avoid such situations (which have caused real bugs in the past). Detecting this can be done with -Wflex-array-member-not-at-end, which will need to be enabled globally. Using a tagged struct_group() to create a new ethtool_link_settings_hdr structure isn't possible as it seems we cannot use the tagged variant of struct_group() due to syntax issues from C++'s perspective (even within "extern C")[2]. Instead, we can just leave the offending member defined in UAPI and remove it from the kernel's view of the structure, as Linux doesn't actually use this member at all. There is also no change in size since it was already a flexible array that didn't contribute to size returned by any use of sizeof(). Reported-by: Jakub Kicinski Closes: https://lore.kernel.org/lkml/20241109100213.262a2fa0@kernel.org/ [2] Link: https://lore.kernel.org/lkml/0bc2809fe2a6c11dd4c8a9a10d9bd65cccdb559b= .1730238285.git.gustavoars@kernel.org/ [1] Signed-off-by: Kees Cook Reviewed-by: Jakub Kicinski --- Cc: Jakub Kicinski Cc: "Gustavo A. R. Silva" Cc: "David S. Miller" Cc: Andrew Lunn Cc: "Kory Maincent (Dent Project)" --- include/uapi/linux/ethtool.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h index c405ed63acfa..7e1b3820f91f 100644 --- a/include/uapi/linux/ethtool.h +++ b/include/uapi/linux/ethtool.h @@ -2526,12 +2526,19 @@ struct ethtool_link_settings { __u8 master_slave_state; __u8 rate_matching; __u32 reserved[7]; +#ifndef __KERNEL__ + /* Linux builds with -Wflex-array-member-not-at-end but does + * not use the "link_mode_masks" member. Leave it defined for + * userspace for now, and when userspace wants to start using + * -Wfamnae, we'll need a new solution. + */ __u32 link_mode_masks[]; /* layout of link_mode_masks fields: * __u32 map_supported[link_mode_masks_nwords]; * __u32 map_advertising[link_mode_masks_nwords]; * __u32 map_lp_advertising[link_mode_masks_nwords]; */ +#endif }; =20 /** --=20 2.34.1