netdev - Re: [Patch net-next] ipip: fix a regression in ioctl

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Message-ID: <CALnjE+q5AW+6hwViLgh8CKScwP0uZao8r75B8_9h1unqKduO-w@mail.gmail.com>
Date:	Mon, 1 Jul 2013 08:03:33 -0700
From:	Pravin Shelar <pshelar@...ira.com>
To:	Cong Wang <amwang@...hat.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: [Patch net-next] ipip: fix a regression in ioctl

On Sun, Jun 30, 2013 at 7:11 PM, Cong Wang <amwang@...hat.com> wrote:
> On Sat, 2013-06-29 at 20:43 -0700, Pravin Shelar wrote:
>> On Fri, Jun 28, 2013 at 9:11 PM, Cong Wang <amwang@...hat.com> wrote:
>> > From: Cong Wang <amwang@...hat.com>
>> >
>> > This is a regression introduced by
>> > commit fd58156e456d9f68fe0448 (IPIP: Use ip-tunneling code.)
>> >
>> > Similar to GRE tunnel, previously we only check the parameters
>> > for SIOCADDTUNNEL and SIOCCHGTUNNEL, after that commit, the
>> > check is moved for all commands.
>> >
>> > So, just check for SIOCADDTUNNEL and SIOCCHGTUNNEL.
>> >
>> > Also, the check for i_key, o_key etc. is suspicious too,
>> > which did not exist before.
>> >
>> This check is sanity check since ipip is not suppose to have these
>> parameters set, generic layer do allow all parameters.
>> Earlier ipip was not using generic layer, therefore that check was not present.
>
> So, if old code doesn't reject this case with EINVAL, then your change
> _does_ break user-space applications... no matter whether ipip is
> supposed to have these parameters.
>
ok, Then we shld reset these fields before passing them to ip_tunnels layer.

>
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