linux-kernel - Re: [PATCH v4 0/3] Send audit/procinfo/cgroup data in socket-level control message

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Message-ID: <52D4F471.7020600@redhat.com>
Date:	Tue, 14 Jan 2014 09:25:21 +0100
From:	Jan Kaluža <jkaluza@...hat.com>
To:	Casey Schaufler <casey@...aufler-ca.com>, davem@...emloft.net
CC:	LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
	eparis@...hat.com, rgb@...hat.com, tj@...nel.org,
	lizefan@...wei.com, containers@...ts.linux-foundation.org,
	cgroups@...r.kernel.org, viro@...iv.linux.org.uk
Subject: Re: [PATCH v4 0/3] Send audit/procinfo/cgroup data in socket-level
 control message

On 01/13/2014 08:44 PM, Casey Schaufler wrote:
> On 1/13/2014 12:01 AM, Jan Kaluza wrote:
>> Hi,
>>
>> this patchset against net-next (applies also to linux-next) adds 3 new types
>> of "Socket"-level control message (SCM_AUDIT, SCM_PROCINFO and SCM_CGROUP).
>
> How about the group list, while you're at it?

That would be of course possible, but I would rather start with these 
three patches at the beginning before adding more features, because I'm 
not sure if there is consensus on accepting them. But I have no problem 
with introducing group list later.

>>
>> Server-like processes in many cases need credentials and other
>> metadata of the peer, to decide if the calling process is allowed to
>> request a specific action, or the server just wants to log away this
>> type of information for auditing tasks.
>>
>> The current practice to retrieve such process metadata is to look that
>> information up in procfs with the $PID received over SCM_CREDENTIALS.
>> This is sufficient for long-running tasks, but introduces a race which
>> cannot be worked around for short-living processes; the calling
>> process and all the information in /proc/$PID/ is gone before the
>> receiver of the socket message can look it up.
>>
>> Changes introduced in this patchset can also increase performance
>> of such server-like processes, because current way of opening and
>> parsing /proc/$PID/* files is much more expensive than receiving these
>> metadata using SCM.
>>
>> Changes in v4:
>> - Rebased to work with the latest net-next tree
>>
>> Changes in v3:
>> - Better description of patches (Thanks to Kay Sievers)
>>
>> Changes in v2:
>> - use PATH_MAX instead of PAGE_SIZE in SCM_CGROUP patch
>> - describe each patch individually
>>
>> Jan Kaluza (3):
>>    Send loginuid and sessionid in SCM_AUDIT
>>    Send comm and cmdline in SCM_PROCINFO
>>    Send cgroup_path in SCM_CGROUP
>>
>>   include/linux/socket.h |  9 ++++++
>>   include/net/af_unix.h  | 10 ++++++
>>   include/net/scm.h      | 67 ++++++++++++++++++++++++++++++++++++++--
>>   net/core/scm.c         | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++
>>   net/unix/af_unix.c     | 70 ++++++++++++++++++++++++++++++++++++++++++
>>   5 files changed, 237 insertions(+), 2 deletions(-)
>>
>

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