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From: Joel Granados via B4 Relay <devnull+j.granados.samsung.com@kernel.org>
Date: Thu, 25 Apr 2024 14:03:04 +0200
Subject: [PATCH v4 6/8] netfilter: Remove the now superfluous sentinel
 elements from ctl_table array
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In-Reply-To: <20240425-jag-sysctl_remset_net-v4-0-9e82f985777d@samsung.com>
To: "David S. Miller" <davem@davemloft.net>, 
 Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, 
 Paolo Abeni <pabeni@redhat.com>, Alexander Aring <alex.aring@gmail.com>, 
 Stefan Schmidt <stefan@datenfreihafen.org>, 
 Miquel Raynal <miquel.raynal@bootlin.com>, David Ahern <dsahern@kernel.org>, 
 Steffen Klassert <steffen.klassert@secunet.com>, 
 Herbert Xu <herbert@gondor.apana.org.au>, 
 Matthieu Baerts <matttbe@kernel.org>, Mat Martineau <martineau@kernel.org>, 
 Geliang Tang <geliang@kernel.org>, Ralf Baechle <ralf@linux-mips.org>, 
 Remi Denis-Courmont <courmisch@gmail.com>, 
 Allison Henderson <allison.henderson@oracle.com>, 
 David Howells <dhowells@redhat.com>, Marc Dionne <marc.dionne@auristor.com>, 
 Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>, 
 Xin Long <lucien.xin@gmail.com>, Wenjia Zhang <wenjia@linux.ibm.com>, 
 Jan Karcher <jaka@linux.ibm.com>, "D. Wythe" <alibuda@linux.alibaba.com>, 
 Tony Lu <tonylu@linux.alibaba.com>, Wen Gu <guwen@linux.alibaba.com>, 
 Trond Myklebust <trond.myklebust@hammerspace.com>, 
 Anna Schumaker <anna@kernel.org>, Chuck Lever <chuck.lever@oracle.com>, 
 Jeff Layton <jlayton@kernel.org>, Neil Brown <neilb@suse.de>, 
 Olga Kornievskaia <kolga@netapp.com>, Dai Ngo <Dai.Ngo@oracle.com>, 
 Tom Talpey <tom@talpey.com>, Jon Maloy <jmaloy@redhat.com>, 
 Ying Xue <ying.xue@windriver.com>, Martin Schiller <ms@dev.tdt.de>, 
 Pablo Neira Ayuso <pablo@netfilter.org>, 
 Jozsef Kadlecsik <kadlec@netfilter.org>, Florian Westphal <fw@strlen.de>, 
 Roopa Prabhu <roopa@nvidia.com>, Nikolay Aleksandrov <razor@blackwall.org>, 
 Simon Horman <horms@verge.net.au>, Julian Anastasov <ja@ssi.bg>, 
 Joerg Reuter <jreuter@yaina.de>, Luis Chamberlain <mcgrof@kernel.org>, 
 Kees Cook <keescook@chromium.org>
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 <j.granados@samsung.com>
Reply-To: j.granados@samsung.com

From: Joel Granados <j.granados@samsung.com>

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/)

* Remove sentinel elements from ctl_table structs
* Remove instances where an array element is zeroed out to make it look
  like a sentinel. This is not longer needed and is safe after commit
  c899710fe7f9 ("networking: Update to register_net_sysctl_sz") added
  the array size to the ctl_table registration
* Remove the need for having __NF_SYSCTL_CT_LAST_SYSCTL as the
  sysctl array size is now in NF_SYSCTL_CT_LAST_SYSCTL
* Remove extra element in ctl_table arrays declarations

Acked-by: Kees Cook <keescook@chromium.org> # loadpin & yama
Signed-off-by: Joel Granados <j.granados@samsung.com>
---
 net/bridge/br_netfilter_hooks.c         | 1 -
 net/ipv6/netfilter/nf_conntrack_reasm.c | 1 -
 net/netfilter/ipvs/ip_vs_ctl.c          | 5 +----
 net/netfilter/ipvs/ip_vs_lblc.c         | 5 +----
 net/netfilter/ipvs/ip_vs_lblcr.c        | 5 +----
 net/netfilter/nf_conntrack_standalone.c | 6 +-----
 net/netfilter/nf_log.c                  | 3 +--
 7 files changed, 5 insertions(+), 21 deletions(-)

diff --git a/net/bridge/br_netfilter_hooks.c b/net/bridge/br_netfilter_hooks.c
index 35e10c5a766d..d31f57ffe985 100644
--- a/net/bridge/br_netfilter_hooks.c
+++ b/net/bridge/br_netfilter_hooks.c
@@ -1219,7 +1219,6 @@ static struct ctl_table brnf_table[] = {
 		.mode		= 0644,
 		.proc_handler	= brnf_sysctl_call_tables,
 	},
-	{ }
 };
 
 static inline void br_netfilter_sysctl_default(struct brnf_net *brnf)
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index 1a51a44571c3..8531750ec081 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -62,7 +62,6 @@ static struct ctl_table nf_ct_frag6_sysctl_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_doulongvec_minmax,
 	},
-	{ }
 };
 
 static int nf_ct_frag6_sysctl_register(struct net *net)
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 143a341bbc0a..50b5dbe40eb8 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -2263,7 +2263,6 @@ static struct ctl_table vs_vars[] = {
 		.proc_handler	= proc_dointvec,
 	},
 #endif
-	{ }
 };
 
 #endif
@@ -4286,10 +4285,8 @@ static int __net_init ip_vs_control_net_init_sysctl(struct netns_ipvs *ipvs)
 			return -ENOMEM;
 
 		/* Don't export sysctls to unprivileged users */
-		if (net->user_ns != &init_user_ns) {
-			tbl[0].procname = NULL;
+		if (net->user_ns != &init_user_ns)
 			ctl_table_size = 0;
-		}
 	} else
 		tbl = vs_vars;
 	/* Initialize sysctl defaults */
diff --git a/net/netfilter/ipvs/ip_vs_lblc.c b/net/netfilter/ipvs/ip_vs_lblc.c
index 8ceec7a2fa8f..2423513d701d 100644
--- a/net/netfilter/ipvs/ip_vs_lblc.c
+++ b/net/netfilter/ipvs/ip_vs_lblc.c
@@ -123,7 +123,6 @@ static struct ctl_table vs_vars_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_jiffies,
 	},
-	{ }
 };
 #endif
 
@@ -563,10 +562,8 @@ static int __net_init __ip_vs_lblc_init(struct net *net)
 			return -ENOMEM;
 
 		/* Don't export sysctls to unprivileged users */
-		if (net->user_ns != &init_user_ns) {
-			ipvs->lblc_ctl_table[0].procname = NULL;
+		if (net->user_ns != &init_user_ns)
 			vars_table_size = 0;
-		}
 
 	} else
 		ipvs->lblc_ctl_table = vs_vars_table;
diff --git a/net/netfilter/ipvs/ip_vs_lblcr.c b/net/netfilter/ipvs/ip_vs_lblcr.c
index 0fb64707213f..cdb1d4bf6761 100644
--- a/net/netfilter/ipvs/ip_vs_lblcr.c
+++ b/net/netfilter/ipvs/ip_vs_lblcr.c
@@ -294,7 +294,6 @@ static struct ctl_table vs_vars_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_jiffies,
 	},
-	{ }
 };
 #endif
 
@@ -749,10 +748,8 @@ static int __net_init __ip_vs_lblcr_init(struct net *net)
 			return -ENOMEM;
 
 		/* Don't export sysctls to unprivileged users */
-		if (net->user_ns != &init_user_ns) {
-			ipvs->lblcr_ctl_table[0].procname = NULL;
+		if (net->user_ns != &init_user_ns)
 			vars_table_size = 0;
-		}
 	} else
 		ipvs->lblcr_ctl_table = vs_vars_table;
 	ipvs->sysctl_lblcr_expiration = DEFAULT_EXPIRATION;
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 0ee98ce5b816..2f226cfb32d0 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -616,11 +616,9 @@ enum nf_ct_sysctl_index {
 	NF_SYSCTL_CT_LWTUNNEL,
 #endif
 
-	__NF_SYSCTL_CT_LAST_SYSCTL,
+	NF_SYSCTL_CT_LAST_SYSCTL,
 };
 
-#define NF_SYSCTL_CT_LAST_SYSCTL (__NF_SYSCTL_CT_LAST_SYSCTL + 1)
-
 static struct ctl_table nf_ct_sysctl_table[] = {
 	[NF_SYSCTL_CT_MAX] = {
 		.procname	= "nf_conntrack_max",
@@ -957,7 +955,6 @@ static struct ctl_table nf_ct_sysctl_table[] = {
 		.proc_handler	= nf_hooks_lwtunnel_sysctl_handler,
 	},
 #endif
-	{}
 };
 
 static struct ctl_table nf_ct_netfilter_table[] = {
@@ -968,7 +965,6 @@ static struct ctl_table nf_ct_netfilter_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec,
 	},
-	{ }
 };
 
 static void nf_conntrack_standalone_init_tcp_sysctl(struct net *net,
diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
index 370f8231385c..d42ba733496b 100644
--- a/net/netfilter/nf_log.c
+++ b/net/netfilter/nf_log.c
@@ -395,7 +395,7 @@ static const struct seq_operations nflog_seq_ops = {
 
 #ifdef CONFIG_SYSCTL
 static char nf_log_sysctl_fnames[NFPROTO_NUMPROTO-NFPROTO_UNSPEC][3];
-static struct ctl_table nf_log_sysctl_table[NFPROTO_NUMPROTO+1];
+static struct ctl_table nf_log_sysctl_table[NFPROTO_NUMPROTO];
 static struct ctl_table_header *nf_log_sysctl_fhdr;
 
 static struct ctl_table nf_log_sysctl_ftable[] = {
@@ -406,7 +406,6 @@ static struct ctl_table nf_log_sysctl_ftable[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec,
 	},
-	{ }
 };
 
 static int nf_log_proc_dostring(struct ctl_table *table, int write,

-- 
2.43.0