linux-kernel - Re: [PATCH 2/2] net: Implement SO_PASSCGROUP to enable passing cgroup path

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Date:	Wed, 16 Apr 2014 12:13:57 -0400
From:	Simo Sorce <ssorce@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	David Miller <davem@...emloft.net>,
	Vivek Goyal <vgoyal@...hat.com>, Tejun Heo <tj@...nel.org>,
	Daniel Walsh <dwalsh@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	lpoetter@...hat.com, cgroups@...r.kernel.org, kay@...hat.com,
	Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/2] net: Implement SO_PASSCGROUP to enable passing
 cgroup path

On Wed, 2014-04-16 at 07:37 -0700, Andy Lutomirski wrote:
> On Wed, Apr 16, 2014 at 5:57 AM, David Miller <davem@...emloft.net> wrote:
> >
> > Please, just stop.
> 
> No.
> 
> This thread is proposing an ABI.  This means that, if the ABI ends up
> in Linus's kernel, then it has to be supported forever.  Now is the
> time to find and fix any issues with it before they become much harder
> to fix.

Ok, but so far I haven't seen a single objection from you that has solid
grounds.

The only one that *may* be reasonable is the "secret" cgroup name one,
however nobody seem to come up with a reason why it is legitimate to
allow to keep cgroup names secret.

And if you can come up with such a good reason the SO_NOPASSCGROUP
option seem the right solution.

> This ABI is especially tricky because programs will use it even if
> they don't explicitly try to.  So just adding the ABI may break
> existing assumptions that are relevant to security or correctness.

It's not clear to me what you mean by this, either you explicitly use
SO_PASSCGROUP or not, it's not like you can involuntarily add a flag ...

Simo.


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