Re: About ACL for IPC Object

From: AmÃrico Wang
Date: Mon Jan 25 2010 - 11:25:04 EST

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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