linux-kernel - Re: [PATCH] security: move LSM xattrnames to xattr.h

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Message-Id: <201010120919.11819.sgrubb@redhat.com>
Date:	Tue, 12 Oct 2010 09:19:11 -0400
From:	Steve Grubb <sgrubb@...hat.com>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	Ozan Çağlayan <ozan@...dus.org.tr>,
	James Morris <jmorris@...ei.org>, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	Casey Schaufler <casey@...aufler-ca.com>,
	David Safford <safford@...son.ibm.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Mimi Zohar <zohar@...ibm.com>
Subject: Re: [PATCH] security: move LSM xattrnames to xattr.h

On Tuesday, October 12, 2010 09:06:09 am Mimi Zohar wrote:
> On Tue, 2010-10-12 at 14:14 +0300, Ozan Çağlayan wrote:
> > Cuma 02 Temmuz 2010 günü (saat 03:16:01) James Morris şunları yazmıştı:
> > > On Thu, 1 Jul 2010, Mimi Zohar wrote:
> > > > Make the security extended attributes names global. Updated to move
> > > > the remaining Smack xattrs.
> > > > 
> > > > Signed-off-by: Mimi Zohar <zohar@...ibm.com>
> > > > Acked-by: Serge Hallyn <serue@...ibm.com>
> > 
> > This drops
> > 
> > #define XATTR_CAPS_SUFFIX "capability"
> > #define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX
> > 
> > definitions from capability.h and puts them in xattr.h's #ifdef
> > __KERNEL__ section making them invisible to userspace like libcap-ng
> > causing build failures.
> > 
> > Am I wrong?
> 
> You're correct.  It's the same reason that cap-ng.c has to define
> 'security'.
> 
> #ifdef VFS_CAP_U32
>  #include <attr/xattr.h>
>  #define XATTR_SECURITY_PREFIX "security."
> 
> Am cc'ing Steve.

So does this mean I need to provide more definitions for libcap-ng to work with 
future kernels or are you asking my opinion? My opinion is that if user space 
needs it to work correctly, please let it be available so I don't have to make 
my own define which may be inaccurate one day.

Thanks,
-Steve
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