netdev - Re: Netlink mmap tx security?

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Date:	Wed, 15 Oct 2014 16:58:39 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	David Miller <davem@...emloft.net>
Cc:	Daniel Borkmann <dborkman@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Patrick McHardy <kaber@...sh.net>,
	Network Development <netdev@...r.kernel.org>,
	Thomas Graf <tgraf@...g.ch>
Subject: Re: Netlink mmap tx security?

On Wed, Oct 15, 2014 at 4:57 PM, David Miller <davem@...emloft.net> wrote:
> From: Daniel Borkmann <dborkman@...hat.com>
> Date: Thu, 16 Oct 2014 01:45:22 +0200
>
>> On 10/15/2014 04:01 AM, David Miller wrote:
>>> From: Andy Lutomirski <luto@...capital.net>
>>> Date: Tue, 14 Oct 2014 15:16:46 -0700
>>>
>>>> It's at least remotely possible that there's something that assumes
>>>> that assumes that the availability of NETLINK_RX_RING implies
>>>> NETLINK_TX_RING, which would be unfortunate.
>>>
>>> I already found one such case, nlmon :-/
>>
>> Hmm, can you elaborate? I currently don't think that nlmon cares
>> actually.
>
> nlmon cares, openvswitch cares, etc:

It'll still work, just slower, right?

+    if (setsockopt(sock->fd, SOL_NETLINK, NETLINK_RX_RING, &req,
sizeof(req)) < 0
+        || setsockopt(sock->fd, SOL_NETLINK, NETLINK_TX_RING, &req,
sizeof(req)) < 0) {
+        VLOG_INFO("mmap netlink is not supported");
+        return 0;
+    }
+

--Andy
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