From: ebiederm@xmission•com (Eric W. Biederman)
To: David Miller <davem@davemloft•net>
Cc: <netdev@vger•kernel.org>, "Serge E. Hallyn" <serge@hallyn•com>,
Gao feng <gaofeng@cn•fujitsu.com>,
pablo@netfilter•org, Stephen Hemminger <shemminger@vyatta•com>,
Pavel Emelyanov <xemul@openvz•org>
Subject: [PATCH net-next 02/19] net sysctl: Register an empty /proc/sys/net
Date: Thu, 19 Apr 2012 16:19:46 -0700 [thread overview]
Message-ID: <m1zka7gvhp.fsf@fess.ebiederm.org> (raw)
In-Reply-To: <m1aa27ia6h.fsf@fess.ebiederm.org> (Eric W. Biederman's message of "Thu, 19 Apr 2012 16:17:10 -0700")
Implementation limitations of the sysctl core won't let /proc/sys/net
reside in a network namespace. /proc/sys/net at least must be registered
as a normal sysctl. So register /proc/sys/net early as an empty directory
to guarantee we don't violate this constraint and hit bugs in the sysctl
implementation.
Signed-off-by: Eric W. Biederman <ebiederm@xmission•com>
---
net/sysctl_net.c | 11 ++++++++++-
1 files changed, 10 insertions(+), 1 deletions(-)
diff --git a/net/sysctl_net.c b/net/sysctl_net.c
index 3865c4f..2b2986d 100644
--- a/net/sysctl_net.c
+++ b/net/sysctl_net.c
@@ -88,9 +88,18 @@ static struct pernet_operations sysctl_pernet_ops = {
.exit = sysctl_net_exit,
};
+static struct ctl_table_header *net_header;
static __init int net_sysctl_init(void)
{
- int ret;
+ static struct ctl_table empty[1];
+ int ret = -ENOMEM;
+ /* Avoid limitations in the sysctl implementation by
+ * registering "/proc/sys/net" as an empty directory not in a
+ * network namespace.
+ */
+ net_header = register_sysctl("net", empty);
+ if (!net_header)
+ goto out;
ret = register_pernet_subsys(&sysctl_pernet_ops);
if (ret)
goto out;
--
1.7.2.5
next prev parent reply other threads:[~2012-04-19 23:15 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-19 23:17 [PATCH net-next 00/19] net: Sysctl simplifications and enhancements Eric W. Biederman
2012-04-19 23:18 ` [PATCH net-next 01/19] net: Implement register_net_sysctl Eric W. Biederman
2012-04-20 5:27 ` Pavel Emelyanov
2012-04-20 8:11 ` Eric W. Biederman
2012-04-20 8:45 ` Pavel Emelyanov
2012-04-19 23:19 ` Eric W. Biederman [this message]
2012-04-19 23:20 ` [PATCH net-next 03/19] net sysctl: Initialize the network sysctls sooner to avoid problems Eric W. Biederman
2012-04-19 23:22 ` [PATCH net-next 04/19] net: Kill register_sysctl_rotable Eric W. Biederman
2012-04-20 13:53 ` Serge E. Hallyn
2012-04-20 14:42 ` Eric W. Biederman
2012-04-19 23:24 ` [PATCH net-next 05/19] net: Move all of the network sysctls without a namespace into init_net Eric W. Biederman
2012-04-23 0:38 ` Gao feng
2012-04-23 1:50 ` Eric W. Biederman
2012-04-23 2:29 ` Gao feng
2012-04-19 23:25 ` [PATCH net-next 06/19] net core: Remove unneded creation of an empty net/core sysctl directory Eric W. Biederman
2012-04-19 23:26 ` [PATCH net-next 07/19] net ipv6: Remove unneded registration of an empty net/ipv6/neigh Eric W. Biederman
2012-04-19 23:32 ` [PATCH net-next 08/19] net ipv4: Remove the unneeded registration of an empty net/ipv4/neigh Eric W. Biederman
2012-04-19 23:34 ` [PATCH net-next 09/19] net ax25: Simplify and cleanup the ax25 sysctl handling Eric W. Biederman
2012-04-19 23:35 ` [PATCH net-next 10/19] net llc: Don't use sysctl tables with .child entries Eric W. Biederman
2012-04-19 23:37 ` [PATCH net-next 11/19] net ipv6: " Eric W. Biederman
2012-04-19 23:38 ` [PATCH net-next 12/19] net neighbour: Convert to use register_net_sysctl Eric W. Biederman
2012-04-20 5:21 ` Pavel Emelyanov
2012-04-20 7:25 ` Eric W. Biederman
2012-04-22 2:36 ` Ben Hutchings
2012-04-19 23:40 ` [PATCH net-next 13/19] net decnet: " Eric W. Biederman
2012-04-19 23:41 ` [PATCH net-next 14/19] net ipv6: Convert addrconf " Eric W. Biederman
2012-04-19 23:42 ` [PATCH net-next 15/19] net ipv4: Convert devinet " Eric W. Biederman
2012-04-19 23:43 ` [PATCH net-next 16/19] net: Convert nf_conntrack_proto " Eric W. Biederman
2012-04-19 23:44 ` [PATCH net-next 17/19] net: Convert all sysctl registrations to register_net_sysctl Eric W. Biederman
2012-04-19 23:45 ` [PATCH net-next 18/19] net: Delete all remaining instances of ctl_path Eric W. Biederman
2012-04-19 23:46 ` [PATCH net-next 19/19] net: Remove register_net_sysctl_table Eric W. Biederman
2012-04-20 8:45 ` [PATCH net-next 00/19] net: Sysctl simplifications and enhancements Pavel Emelyanov
2012-04-21 1:24 ` David Miller
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