From patchwork Wed May 1 09:29:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Granados via B4 Relay X-Patchwork-Id: 13650419 X-Patchwork-Delegate: kuba@kernel.org 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 BD4EE535D9; Wed, 1 May 2024 09:30:09 +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=1714555809; cv=none; b=ZIwIeK70qQvChZSnBS2Co3KIi/rnhcYZSb+xdSTfAeyo0gjB74LsIvBkE8wunZHW3XVAEF0/HxxocjhgoYBSHOoZucZ0FHa3EydCXENWcCMo41SWNSTcueYuNwH28tHCuysNDdIj4LT0wk9ArkmzPEV8nt2sYOveBzMSTFTl0ec= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714555809; c=relaxed/simple; bh=hNf63Pk2HgAGXyBQQDS5WAsEv/JgWTScOzabV6lKgvc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=megTcRyJRsBYfgaR5qQIMqjFDPH3nXp/WF5JC1zG6Sx/OFpo0wZ5RCUCON08BPJHRgD48uendNOsVgGJL+d4eak8bNjiETBF36DD2yEOqhp99fDv1GD5/T/ti1C/6QgaE2NVyg+ALPp3eGJfpPVv6N8tdGHewoSSMmDAXszaAGM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VQd0De6S; 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="VQd0De6S" Received: by smtp.kernel.org (Postfix) with ESMTPS id 20793C4DDF0; Wed, 1 May 2024 09:30:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1714555809; bh=hNf63Pk2HgAGXyBQQDS5WAsEv/JgWTScOzabV6lKgvc=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=VQd0De6So4doAjJTCCet49lx95qoLIjPiu5+aD+VXkqFT6+RutHhFAN1iIcbE62nZ fa6NJeX4drewKJvWHV3wZPubVy/y9m5dhrukSR/4RF4qZ2q0tXm+xxrwIDiKphT+oe RKBBYh6fdHuqcg1engr3LK9ZIQ0MOSZu6bCXNh1V1u4YvOgw50T3IVTr5ie4UwtUrJ TriWlwx+iVIAXtspLSF3kX5Wd71+dTQ/d/Lq+/wUoE+ixoueyoW0Nlj9AU2raN/1g3 6+84w7Kpev/GEl9c7B/TgkQhP6Wb/8AzxCICoc6EcbQw8H6SllPzkZs/KmMCFzgHQI WIT/g4ZxcD4rA== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 13FF7C25B76; Wed, 1 May 2024 09:30:09 +0000 (UTC) From: Joel Granados via B4 Relay Date: Wed, 01 May 2024 11:29:32 +0200 Subject: [PATCH net-next v6 8/8] ax.25: x.25: Remove the now superfluous sentinel elements from ctl_table array Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240501-jag-sysctl_remset_net-v6-8-370b702b6b4a@samsung.com> References: <20240501-jag-sysctl_remset_net-v6-0-370b702b6b4a@samsung.com> In-Reply-To: <20240501-jag-sysctl_remset_net-v6-0-370b702b6b4a@samsung.com> To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexander Aring , Stefan Schmidt , Miquel Raynal , David Ahern , Steffen Klassert , Herbert Xu , Matthieu Baerts , Mat Martineau , Geliang Tang , Ralf Baechle , Remi Denis-Courmont , Allison Henderson , David Howells , Marc Dionne , Marcelo Ricardo Leitner , Xin Long , Wenjia Zhang , Jan Karcher , "D. Wythe" , Tony Lu , Wen Gu , Trond Myklebust , Anna Schumaker , Chuck Lever , Jeff Layton , Neil Brown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Jon Maloy , Ying Xue , Martin Schiller , Pablo Neira Ayuso , Jozsef Kadlecsik , Florian Westphal , Roopa Prabhu , Nikolay Aleksandrov , Simon Horman , Julian Anastasov , Joerg Reuter , Luis Chamberlain , Kees Cook Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, dccp@vger.kernel.org, linux-wpan@vger.kernel.org, mptcp@lists.linux.dev, linux-hams@vger.kernel.org, linux-rdma@vger.kernel.org, rds-devel@oss.oracle.com, linux-afs@lists.infradead.org, linux-sctp@vger.kernel.org, linux-s390@vger.kernel.org, linux-nfs@vger.kernel.org, tipc-discussion@lists.sourceforge.net, linux-x25@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, bridge@lists.linux.dev, lvs-devel@vger.kernel.org, Joel Granados X-Mailer: b4 0.13-dev-2d940 X-Developer-Signature: v=1; a=openpgp-sha256; l=3832; i=j.granados@samsung.com; h=from:subject:message-id; bh=AuUMNVULwdRpc7MqK6QxuNKeT/f1k5AlEkDFZpyU2BQ=; b=owJ4nAHtARL+kA0DAAoBupfNUreWQU8ByyZiAGYyC55+jATyuag2cMz+nAfHl+HL6F0qL73yQ it9OOI3ZHMdqIkBswQAAQoAHRYhBK5HCVcl5jElzssnkLqXzVK3lkFPBQJmMgueAAoJELqXzVK3 lkFPeOEL/jPjta+dOJSZPZOjLVWcJG08CJUC7rYb1k0PNtxO7S/21gaMJjENoVcIEVGESaFX22i 7CGruN2yxgicXlNg5nTRv1ZrlzybcKiPH06JFYreKEgLe6CJ4UsTGS/jXsMpupMDpSw3FsLRf2b p0RiEVHZlB5v+TY5XZVLfYuni9WBamS0CWyHo/YP4Cpt7BFk7Z400iRHZtp8Mm3BbernP88WLsI tu+949SFzqw3fVIsjFSrmWoCP3O1O3XbWbwn1jbbvjMMcwEoQ5HtlVMe4wofVUgR58+Qo4dxmMg cnk4INgUh0IkD/gez2ewL7bnlZDDKjRA1wtR25xIqsxCmxeamUeFFjWs1856xfEwNa8w48gn3q6 jKggb0B5t38jUi1rgISS3kB5+IDwZsSmZLV7SdEBgZTQoA0WntUu/A6QzpK/dm4yw4JHktCZeyb G7zXpWgiGYiuhdcJC4yBMyJcFqQUYM71xk7umchoPq1It2qt5P/Iwgk1NCdtrg06W7Bz3uHXL76 mk= X-Developer-Key: i=j.granados@samsung.com; a=openpgp; fpr=F1F8E46D30F0F6C4A45FF4465895FAAC338C6E77 X-Endpoint-Received: by B4 Relay for j.granados@samsung.com/default with auth_id=70 X-Original-From: Joel Granados Reply-To: j.granados@samsung.com X-Patchwork-Delegate: kuba@kernel.org From: Joel Granados This commit comes at the tail end of a greater effort to remove the empty elements at the end of the ctl_table arrays (sentinels) which will reduce the overall build time size of the kernel and run time memory bloat by ~64 bytes per sentinel (further information Link : https://lore.kernel.org/all/ZO5Yx5JFogGi%2FcBo@bombadil.infradead.org/) Avoid a buffer overflow when traversing the ctl_table by ensuring that AX25_MAX_VALUES is the same as the size of ax25_param_table. This is done with a BUILD_BUG_ON where ax25_param_table is defined and a CONFIG_AX25_DAMA_SLAVE guard in the unnamed enum definition as well as in the ax25_dev_device_up and ax25_ds_set_timer functions. The overflow happened when the sentinel was removed from ax25_param_table. The sentinel's data element was changed when CONFIG_AX25_DAMA_SLAVE was undefined. This had no adverse effects as it still stopped on the sentinel's null procname but needed to be addressed once the sentinel was removed. Signed-off-by: Joel Granados --- include/net/ax25.h | 2 ++ net/ax25/ax25_dev.c | 3 +++ net/ax25/ax25_ds_timer.c | 1 + net/ax25/sysctl_net_ax25.c | 3 +-- net/x25/sysctl_net_x25.c | 1 - 5 files changed, 7 insertions(+), 3 deletions(-) diff --git a/include/net/ax25.h b/include/net/ax25.h index 0d939e5aee4e..eb9cee8252c8 100644 --- a/include/net/ax25.h +++ b/include/net/ax25.h @@ -139,7 +139,9 @@ enum { AX25_VALUES_N2, /* Default N2 value */ AX25_VALUES_PACLEN, /* AX.25 MTU */ AX25_VALUES_PROTOCOL, /* Std AX.25, DAMA Slave, DAMA Master */ +#ifdef CONFIG_AX25_DAMA_SLAVE AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */ +#endif AX25_MAX_VALUES /* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */ }; diff --git a/net/ax25/ax25_dev.c b/net/ax25/ax25_dev.c index 282ec581c072..0bc682ffae9c 100644 --- a/net/ax25/ax25_dev.c +++ b/net/ax25/ax25_dev.c @@ -78,7 +78,10 @@ void ax25_dev_device_up(struct net_device *dev) ax25_dev->values[AX25_VALUES_N2] = AX25_DEF_N2; ax25_dev->values[AX25_VALUES_PACLEN] = AX25_DEF_PACLEN; ax25_dev->values[AX25_VALUES_PROTOCOL] = AX25_DEF_PROTOCOL; + +#ifdef CONFIG_AX25_DAMA_SLAVE ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT; +#endif #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER) ax25_ds_setup_timer(ax25_dev); diff --git a/net/ax25/ax25_ds_timer.c b/net/ax25/ax25_ds_timer.c index c4f8adbf8144..c50a58d9e368 100644 --- a/net/ax25/ax25_ds_timer.c +++ b/net/ax25/ax25_ds_timer.c @@ -55,6 +55,7 @@ void ax25_ds_set_timer(ax25_dev *ax25_dev) ax25_dev->dama.slave_timeout = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_DS_TIMEOUT]) / 10; mod_timer(&ax25_dev->dama.slave_timer, jiffies + HZ); + return; } /* diff --git a/net/ax25/sysctl_net_ax25.c b/net/ax25/sysctl_net_ax25.c index e0128dc9def3..68753aa30334 100644 --- a/net/ax25/sysctl_net_ax25.c +++ b/net/ax25/sysctl_net_ax25.c @@ -141,8 +141,6 @@ static const struct ctl_table ax25_param_table[] = { .extra2 = &max_ds_timeout }, #endif - - { } /* that's all, folks! */ }; int ax25_register_dev_sysctl(ax25_dev *ax25_dev) @@ -155,6 +153,7 @@ int ax25_register_dev_sysctl(ax25_dev *ax25_dev) if (!table) return -ENOMEM; + BUILD_BUG_ON(ARRAY_SIZE(ax25_param_table) != AX25_MAX_VALUES); for (k = 0; k < AX25_MAX_VALUES; k++) table[k].data = &ax25_dev->values[k]; diff --git a/net/x25/sysctl_net_x25.c b/net/x25/sysctl_net_x25.c index e9802afa43d0..643f50874dfe 100644 --- a/net/x25/sysctl_net_x25.c +++ b/net/x25/sysctl_net_x25.c @@ -71,7 +71,6 @@ static struct ctl_table x25_table[] = { .mode = 0644, .proc_handler = proc_dointvec, }, - { }, }; int __init x25_register_sysctl(void)