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Message-Id: <20240412-jag-sysctl_remset_net-v3-4-11187d13c211@samsung.com>
Date: Fri, 12 Apr 2024 16:48:32 +0200
From: Joel Granados via B4 Relay <devnull+j.granados.samsung.com@...nel.org>
To: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Alexander Aring <alex.aring@...il.com>,
Stefan Schmidt <stefan@...enfreihafen.org>,
Miquel Raynal <miquel.raynal@...tlin.com>, David Ahern <dsahern@...nel.org>,
Steffen Klassert <steffen.klassert@...unet.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
Matthieu Baerts <matttbe@...nel.org>, Mat Martineau <martineau@...nel.org>,
Geliang Tang <geliang@...nel.org>, Ralf Baechle <ralf@...ux-mips.org>,
Remi Denis-Courmont <courmisch@...il.com>,
Allison Henderson <allison.henderson@...cle.com>,
David Howells <dhowells@...hat.com>, Marc Dionne <marc.dionne@...istor.com>,
Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
Xin Long <lucien.xin@...il.com>, Wenjia Zhang <wenjia@...ux.ibm.com>,
Jan Karcher <jaka@...ux.ibm.com>, "D. Wythe" <alibuda@...ux.alibaba.com>,
Tony Lu <tonylu@...ux.alibaba.com>, Wen Gu <guwen@...ux.alibaba.com>,
Trond Myklebust <trond.myklebust@...merspace.com>,
Anna Schumaker <anna@...nel.org>, Chuck Lever <chuck.lever@...cle.com>,
Jeff Layton <jlayton@...nel.org>, Neil Brown <neilb@...e.de>,
Olga Kornievskaia <kolga@...app.com>, Dai Ngo <Dai.Ngo@...cle.com>,
Tom Talpey <tom@...pey.com>, Jon Maloy <jmaloy@...hat.com>,
Ying Xue <ying.xue@...driver.com>, Martin Schiller <ms@....tdt.de>,
Pablo Neira Ayuso <pablo@...filter.org>,
Jozsef Kadlecsik <kadlec@...filter.org>, Florian Westphal <fw@...len.de>,
Roopa Prabhu <roopa@...dia.com>, Nikolay Aleksandrov <razor@...ckwall.org>,
Simon Horman <horms@...ge.net.au>, Julian Anastasov <ja@....bg>,
Joerg Reuter <jreuter@...na.de>, Luis Chamberlain <mcgrof@...nel.org>,
Kees Cook <keescook@...omium.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
dccp@...r.kernel.org, linux-wpan@...r.kernel.org, mptcp@...ts.linux.dev,
linux-hams@...r.kernel.org, linux-rdma@...r.kernel.org,
rds-devel@....oracle.com, linux-afs@...ts.infradead.org,
linux-sctp@...r.kernel.org, linux-s390@...r.kernel.org,
linux-nfs@...r.kernel.org, tipc-discussion@...ts.sourceforge.net,
linux-x25@...r.kernel.org, netfilter-devel@...r.kernel.org,
coreteam@...filter.org, bridge@...ts.linux.dev, lvs-devel@...r.kernel.org,
Joel Granados <j.granados@...sung.com>
Subject: [PATCH v3 4/4] ax.25: Remove the now superfluous sentinel elements
from ctl_table array
From: Joel Granados <j.granados@...sung.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/)
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 <j.granados@...sung.com>
---
include/net/ax25.h | 2 ++
net/ax25/ax25_dev.c | 3 +++
net/ax25/ax25_ds_timer.c | 4 ++++
net/ax25/sysctl_net_ax25.c | 3 +--
4 files changed, 10 insertions(+), 2 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 c5462486dbca..af547e185a94 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..8f385d2a7628 100644
--- a/net/ax25/ax25_ds_timer.c
+++ b/net/ax25/ax25_ds_timer.c
@@ -49,12 +49,16 @@ void ax25_ds_del_timer(ax25_dev *ax25_dev)
void ax25_ds_set_timer(ax25_dev *ax25_dev)
{
+#ifdef CONFIG_AX25_DAMA_SLAVE
if (ax25_dev == NULL) /* paranoia */
return;
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);
+#else
+ return;
+#endif
}
/*
diff --git a/net/ax25/sysctl_net_ax25.c b/net/ax25/sysctl_net_ax25.c
index db66e11e7fe8..fb9966926e90 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(AX25_MAX_VALUES != ARRAY_SIZE(ax25_param_table));
for (k = 0; k < AX25_MAX_VALUES; k++)
table[k].data = &ax25_dev->values[k];
--
2.43.0
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