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| author | Daniel Lezcano <dlezcano@fr.ibm.com> | 2008-01-10 02:57:43 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-28 15:01:19 -0800 |
| commit | 7c76509d0da99f29289b9b7ab134791e45d49b15 (patch) | |
| tree | 6cff76a24da35a80106dadfa8669a4a92b971f77 | |
| parent | e71e0349eb32bc438fa80d8990c6f3592967d111 (diff) | |
| download | linux-7c76509d0da99f29289b9b7ab134791e45d49b15.tar.gz | |
[NETNS][IPV6]: Make mld_max_msf readonly in other namespaces.
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>
| -rw-r--r-- | net/ipv6/sysctl_net_ipv6.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/net/ipv6/sysctl_net_ipv6.c b/net/ipv6/sysctl_net_ipv6.c index ae3cfd1b8e0e..d223159638d3 100644 --- a/net/ipv6/sysctl_net_ipv6.c +++ b/net/ipv6/sysctl_net_ipv6.c @@ -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) |