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

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Message-ID: <20140417134123.GA15749@redhat.com>
Date:	Thu, 17 Apr 2014 09:41:23 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Simo Sorce <ssorce@...hat.com>, David Miller <davem@...emloft.net>,
	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, Apr 16, 2014 at 01:24:32PM -0700, Andy Lutomirski wrote:

[..]
> I'm not talking about the risk that someone learns someone's cgroup.
> I'm talking about the risk that a malicious program can get a lot
> entry like: "whatever planted text"
> _SYSTEMD_UNIT=non-malicious.service.  That is, they've spoofed a log
> line.
> 
> If you don't care about spoofing of log lines, then there's no point
> to having the kernel validate them anyway.

What's wrong with this. A message came from a cgroup which maps to
a unit xyz and it got logged.  I can't see what's wrong here.

Anyway that message will get logged with unit information. These patches
will just make getting unit information race free and more reliable.

Thansk
Vivek
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