linux-kernel - Re: About ACL for IPC Object

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Date:	Tue, 26 Jan 2010 00:26:47 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	zhou peng <ailvpeng25@...il.com>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	Christoph Hellwig <hch@...radead.org>,
	Casey Schaufler <casey@...aufler-ca.com>, sds@...ho.nsa.gov,
	jra@...ba.org, 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

On Mon, Jan 25, 2010 at 11:21:44PM +0800, zhou peng wrote:
>I have tested posix sem,posix shm and posix msg queue for ACL on
>fedora 12 with kernel 2.6.32.
>
>Posix sem and posix shm using tmpfs monted by default support ACL well .
>Posix msg queue use mqueue fs mounted by manual but it seem not
>surpoort ACL well. It failed for setting named ACL item:
>{
> $ mkdir /dev/mqueue
> $ mount -o rw, acl -t mqueue none /dev/mqueue
> $cd /dev/mqueue
> "/mq" msg queue object created and used by processes properly
>
> $getfacl mq
>   #file: mq
>   #owner:root
>   #group:root
>   user:rw-
>   group::---
>   other::---
>
> $setfacl -m u:testuser:rw mq                                   /* failed here*/
> $setfacl: mq :Operation not supported
> but mqueue fs works well for setting owner user and owner group items.
>}
>
>I am not sure whether mqueue don't support acl or I make mistake.
>

A quick look at the source code shows mqueue doesn't support ACL.


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