linux-kernel - Re: [PATCH 4/6] BC: user interface (syscalls)

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Message-ID: <44EED77A.20801@sw.ru>
Date:	Fri, 25 Aug 2006 14:56:58 +0400
From:	Kirill Korotaev <dev@...ru>
To:	Alexey Dobriyan <adobriyan@...il.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Pavel Emelianov <xemul@...nvz.org>,
	Andrey Savochkin <saw@...ru>, devel@...nvz.org,
	Rik van Riel <riel@...hat.com>, Andi Kleen <ak@...e.de>,
	Greg KH <greg@...ah.com>, Oleg Nesterov <oleg@...sign.ru>,
	Matt Helsley <matthltc@...ibm.com>,
	Rohit Seth <rohitseth@...gle.com>,
	Chandra Seetharaman <sekharan@...ibm.com>
Subject: Re: [PATCH 4/6] BC: user interface (syscalls)

Alexey Dobriyan wrote:
> On Thu, Aug 24, 2006 at 12:04:16PM +0100, Alan Cox wrote:
> 
>>Ar Mer, 2006-08-23 am 21:35 -0700, ysgrifennodd Andrew Morton:
>>
>>>>Its a uid_t because of setluid() and twenty odd years of existing unix
>>>>practice.
>>>>
>>>
>>>I don't understand.  This number is an identifier for an accounting
>>>container, which was somehow dreamed up by userspace.
>>
>>Which happens to be a uid_t. It could easily be anyother_t of itself and
>>you can create a container_id_t or whatever. It is just a number.
>>
>>The ancient Unix implementations of this kind of resource management and
>>security are built around setluid() which sets a uid value that cannot
>>be changed again and is normally used for security purposes. That
>>happened to be a uid_t and in simple setups at login uid = luid = euid
>>would be the norm.
>>
>>Thus the Linux one happens to be a uid_t. It could be something else but
>>for the "container per user" model whatever a container is must be able
>>to hold all possible uid_t values. So we can certainly do something like
>>
>>typedef uid_t	container_id_t;
> 
> 
> What about cid_t? Google mentions cid_t was used in HP-UX specific IPC (only if
> _INCLUDE_HPUX_SOURCE is defined).
bcid_t?

Thanks,
Kirill
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