tree 85d43e6c5d8b10fb79fcb9c402217f8eb54bbe12
parent aa4cf9452f469f16cea8c96283b641b4576d4a7b
author Eric W. Biederman <ebiederm@xmission.com> 1398288567 -0700
committer David S. Miller <davem@davemloft.net> 1398361494 -0400

net: Use netlink_ns_capable to verify the permisions of netlink messages

It is possible by passing a netlink socket to a more privileged
executable and then to fool that executable into writing to the socket
data that happens to be valid netlink message to do something that
privileged executable did not intend to do.

To keep this from happening replace bare capable and ns_capable calls
with netlink_capable, netlink_net_calls and netlink_ns_capable calls.
Which act the same as the previous calls except they verify that the
opener of the socket had the desired permissions as well.

Reported-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>