linux-kernel - Re: [PATCH] capabilities: audit capability use

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Message-ID: <687b82c6-0e66-0ff1-30f1-a1d60f40f624@gmail.com>
Date:	Wed, 13 Jul 2016 06:52:06 +0000
From:	Topi Miettinen <toiwoton@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, ebiederm@...ssion.com,
	pmladek@...e.com, luto@...nel.org, serge@...lyn.com,
	keescook@...omium.org, Paul Moore <paul@...l-moore.com>,
	Eric Paris <eparis@...hat.com>, Li Zefan <lizefan@...wei.com>,
	Johannes Weiner <hannes@...xchg.org>,
	"moderated list:AUDIT SUBSYSTEM" <linux-audit@...hat.com>,
	"open list:CONTROL GROUP (CGROUP)" <cgroups@...r.kernel.org>,
	"open list:CAPABILITIES" <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH] capabilities: audit capability use

On 07/12/16 14:59, Tejun Heo wrote:
> On Mon, Jul 11, 2016 at 07:47:44PM +0000, Topi Miettinen wrote:
>> It's really critical to be able to associate a task in the logs to
>> cgroups which were valid that time. Or can we infer somehow what cgroups
> 
> When is "that time"?  Without logging all operations, this is
> meaningless.
> 
>> a task was taking part, long time after task exit? Perhaps task cgroup
>> membership changes and changes in available cgroups should be logged too?
>>
>> Some kind of cgroup IDs could be logged instead of long paths. Then
>> these IDs should be reliably resolvable to paths offline somehow.
> 
> I don't think that's doable.  That pretty much requires the kernel to
> remember paths of all past cgroups.

That's a show stopper for audit approach for getting helpful information
for configuration. I'll try something different, probably cgroupstats.

-Topi

> 
>> How usual migrations between cgroups are? Why would a task ever move
>> from (say) systemd/system.slice/smartd.service to anywhere else?
> 
> In most cases, they won't move once set up initially but that's not
> the point of audit subsystem.  Logging this once one exit isn't gonna
> help anything for auditing the system.
> 
> Thanks.
>