linux-kernel - Re: [PATCH] exporting capability code/name pairs (try #5.1)

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Message-ID: <20080218151549.GD24864@sergelap.austin.ibm.com>
Date:	Mon, 18 Feb 2008 09:15:49 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Greg KH <greg@...ah.com>
Cc:	Kohei KaiGai <kaigai@...jp.nec.com>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Li Zefan <lizf@...fujitsu.com>, akpm@...l.org,
	"Andrew G. Morgan" <morgan@...nel.org>, jmorris@...ei.org,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, adobriyan@...il.com
Subject: Re: [PATCH] exporting capability code/name pairs (try #5.1)

Quoting Greg KH (greg@...ah.com):
> On Mon, Feb 18, 2008 at 04:12:53PM +0900, Kohei KaiGai wrote:
> > Greg KH wrote:
> > > On Fri, Feb 15, 2008 at 12:38:02PM -0600, Serge E. Hallyn wrote:
> > >>> --------
> > >>> This patch enables to export code/name of capabilities supported
> > >>> on the running kernel.
> > >>>
> > >>> A newer kernel sometimes adds new capabilities, like CAP_MAC_ADMIN
> > >>> at 2.6.25. However, we have no interface to disclose what capabilities
> > >>> are supported on this kernel. Thus, we have to maintain libcap version
> > >>> in appropriate one synchronously.
> > >>>
> > >>> This patch enables libcap to collect the list of capabilities on
> > >>> run time, and provide them for users.
> > >>> It helps to improve portability of library.
> > >>>
> > >>> It exports these information as regular files under /sys/kernel/capability.
> > >>> The numeric node exports its name, the symbolic node exports its code.
> > >>>
> > >>> Please consider to put this patch on the queue of 2.6.25.
> > >> Looks good, except don't you need to put the code in commoncap.c under a
> > >> #ifdef SYSFS?
> > 
> > Fair enough.
> > I added the #ifdef - #endif block in this patch.
> 
> Not needed, if SYSFS is not build in, all of that code pretty much
> compiles away to nothing.  So you can drop that.

Oops.  Sorry.

-serge
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