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[NETNS][IPV6]: Make mld_max_msf readonly in other namespaces.

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The mld_max_msf protects the system with a maximum allowed multicast
source filters. Making this variable per namespace can be potentially
an problem if someone inside a namespace set it to a big value, that
will impact the whole system including other namespaces.

I don't see any benefits to have it per namespace for now, so in order
to keep a directory entry in a newly created namespace, I make it
read-only when we are not in the initial network namespace.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Lezcano 2008-01-10 02:57:43 -08:00 committed by David S. Miller
parent e71e0349eb
commit 7c76509d0d
1 changed files with 6 additions and 0 deletions
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6
net/ipv6/sysctl_net_ipv6.c
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@ -122,6 +122,12 @@ static int ipv6_sysctl_net_init(struct net *net)
ipv6_table[5].data = &net->ipv6.sysctl.frags.timeout;
ipv6_table[6].data = &net->ipv6.sysctl.frags.secret_interval;
/* We don't want this value to be per namespace, it should be global
to all namespaces, so make it read-only when we are not in the
init network namespace */
if (net != &init_net)
ipv6_table[7].mode = 0444;
net->ipv6.sysctl.table = register_net_sysctl_table(net, net_ipv6_ctl_path,
ipv6_table);
if (!net->ipv6.sysctl.table)