linux-kernel - Re: About ACL for IPC Object

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Message-ID: <4BA95A1A.6020003@schaufler-ca.com>
Date:	Tue, 23 Mar 2010 17:17:30 -0700
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	zhou peng <ailvpeng25@...il.com>
CC:	linux-security-module@...r.kernel.org, linux-next@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: About ACL for IPC Object

zhou peng wrote:
> Hi,
>
> I have added ACL support to POSIX msg queue on linux kernel 2.6.32.
> Casey Schaufler, would you or anyone like review the patch for me please?
>   

I didn't see anything horribly wrong, but I have not tested it.
Christoph's comments should be heeded.

> The patch is attached.
>   

Please include patches inline. It is much easier to make specific
comments that way and it is The Way We Do Things.

> Best,
>
> 2010/1/21 Casey Schaufler <casey@...aufler-ca.com>:
>   
>> zhou peng wrote:
>>     
>>> Hi all,
>>>
>>> There are ACL in file system, but why there are no ACL implementation
>>> in IPC object, eg. shm, message queue, FIFO?
>>>
>>>       
>> Most people haven't noticed that IPC objects are even there, much less
>> that they have mode bits and not ACLs. Even when we were doing security
>> evaluations on Unix boxes in the 1990's they were considered insufficiently
>> interesting to justify the additional work to do ACLs.
>>
>> If you really want ACLs on IPC objects it would make a dandy little
>> project for a summer. I would be happy to review patches.
>>
>>     
>>> Is there any fine grained granting in ipc object just like in file object?
>>>
>>>       
>> As Stephen Smalley points out, you can do it with SELinux, although
>> that it rather like driving a thumbtack with a bulldozer.
>>
>>     
>>> Thanks,
>>> Best
>>>
>>> --
>>> zhoupeng
>>> --
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>>>
>>>
>>>       
>>     
>
>
>
>   

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