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net sysctl: Register an empty /proc/sys/net 

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>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman 2012-04-19 13:19:46 +00:00 committed by David S. Miller
parent ab41a2ca50
commit bc8a36942a
1 changed files with 10 additions and 1 deletions
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11
net/sysctl_net.c
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@ -88,9 +88,18 @@ static struct pernet_operations sysctl_pernet_ops = {
.exit = sysctl_net_exit, .exit = sysctl_net_exit,
}; };
static struct ctl_table_header *net_header;
static __init int net_sysctl_init(void) 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); ret = register_pernet_subsys(&sysctl_pernet_ops);
if (ret) if (ret)
goto out; goto out;