From: Joel Granados via B4 Relay <devnull+j.granados.samsung.com@kernel.org>
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>,
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Nikolay Aleksandrov <razor@blackwall.org>,
Simon Horman <horms@verge.net.au>, Julian Anastasov <ja@ssi.bg>,
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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>
Subject: [PATCH v4 8/8] ax.25: x.25: Remove the now superfluous sentinel elements from ctl_table array
Date: Thu, 25 Apr 2024 14:03:06 +0200 [thread overview]
Message-ID: <20240425-jag-sysctl_remset_net-v4-8-9e82f985777d@samsung.com> (raw)
In-Reply-To: <20240425-jag-sysctl_remset_net-v4-0-9e82f985777d@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/)
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@samsung.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 +--
net/x25/sysctl_net_x25.c | 1 -
5 files changed, 10 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 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..4e593d36d311 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)
--
2.43.0
prev parent reply other threads:[~2024-04-25 12:03 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-25 12:02 [PATCH v4 0/8] sysctl: Remove sentinel elements from networking Joel Granados via B4 Relay
2024-04-25 12:02 ` [PATCH v4 1/8] net: Remove the now superfluous sentinel elements from ctl_table array Joel Granados via B4 Relay
2024-04-25 22:58 ` Jakub Kicinski
2024-04-26 6:59 ` Joel Granados
2024-04-26 14:19 ` Jakub Kicinski
2024-04-29 8:22 ` Joel Granados
2024-05-01 9:16 ` Joel Granados
2024-04-25 12:03 ` [PATCH v4 2/8] net: ipv{6,4}: " Joel Granados via B4 Relay
2024-04-25 12:03 ` [PATCH v4 3/8] net: rds: " Joel Granados via B4 Relay
2024-04-25 12:03 ` [PATCH v4 4/8] net: sunrpc: " Joel Granados via B4 Relay
2024-04-25 12:03 ` [PATCH v4 5/8] net: Remove ctl_table sentinel elements from several networking subsystems Joel Granados via B4 Relay
2024-04-25 12:03 ` [PATCH v4 6/8] netfilter: Remove the now superfluous sentinel elements from ctl_table array Joel Granados via B4 Relay
2024-04-25 12:03 ` [PATCH v4 7/8] appletalk: " Joel Granados via B4 Relay
2024-04-25 12:03 ` Joel Granados via B4 Relay [this message]
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