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 03/19] net sysctl: Initialize the network sysctls sooner to avoid problems.
Date: Thu, 19 Apr 2012 16:20:32 -0700 [thread overview]
Message-ID: <m1ty0fgvgf.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")
If the netfilter code is modified to use register_net_sysctl_table the
kernel fails to boot because the per net sysctl infrasturce is not setup
soon enough. So to avoid races call net_sysctl_init from sock_init().
Signed-off-by: Eric W. Biederman <ebiederm@xmission•com>
---
include/net/net_namespace.h | 5 +++++
net/socket.c | 6 ++++++
net/sysctl_net.c | 3 +--
3 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 446245e..767dcd40 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -283,6 +283,11 @@ struct ctl_path;
struct ctl_table;
struct ctl_table_header;
+#ifdef CONFIG_SYSCTL
+extern int net_sysctl_init(void);
+#else
+static inline int net_sysctl_init(void) { return 0; }
+#endif
extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
const struct ctl_path *path, struct ctl_table *table);
extern struct ctl_table_header *register_net_sysctl_rotable(
diff --git a/net/socket.c b/net/socket.c
index d6c1af9..e345109 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -2524,6 +2524,12 @@ EXPORT_SYMBOL(sock_unregister);
static int __init sock_init(void)
{
int err;
+ /*
+ * Initialize the network sysctl infrastructure.
+ */
+ err = net_sysctl_init();
+ if (err)
+ goto out;
/*
* Initialize sock SLAB cache.
diff --git a/net/sysctl_net.c b/net/sysctl_net.c
index 2b2986d..ce97237 100644
--- a/net/sysctl_net.c
+++ b/net/sysctl_net.c
@@ -89,7 +89,7 @@ static struct pernet_operations sysctl_pernet_ops = {
};
static struct ctl_table_header *net_header;
-static __init int net_sysctl_init(void)
+__init int net_sysctl_init(void)
{
static struct ctl_table empty[1];
int ret = -ENOMEM;
@@ -109,7 +109,6 @@ static __init int net_sysctl_init(void)
out:
return ret;
}
-subsys_initcall(net_sysctl_init);
struct ctl_table_header *register_net_sysctl_table(struct net *net,
const struct ctl_path *path, struct ctl_table *table)
--
1.7.2.5
next prev parent reply other threads:[~2012-04-19 23:16 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 ` [PATCH net-next 02/19] net sysctl: Register an empty /proc/sys/net Eric W. Biederman
2012-04-19 23:20 ` Eric W. Biederman [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=m1ty0fgvgf.fsf@fess.ebiederm.org \
--to=ebiederm@xmission$(echo .)com \
--cc=davem@davemloft$(echo .)net \
--cc=gaofeng@cn$(echo .)fujitsu.com \
--cc=netdev@vger$(echo .)kernel.org \
--cc=pablo@netfilter$(echo .)org \
--cc=serge@hallyn$(echo .)com \
--cc=shemminger@vyatta$(echo .)com \
--cc=xemul@openvz$(echo .)org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox