linux-kernel - Re: [PATCH 05/10] KConfig: Add KConfig entries for Labeled NFS

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Message-ID: <20100707165602.GC28815@fieldses.org>
Date:	Wed, 7 Jul 2010 12:56:02 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	"David P. Quigley" <dpquigl@...ho.nsa.gov>
Cc:	hch@...radead.org, viro@...iv.linux.org.uk, casey@...aufler-ca.com,
	sds@...ho.nsa.gov, matthew.dodd@...rta.com,
	trond.myklebust@....uio.no, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org, selinux@...ho.nsa.gov,
	linux-nfs@...r.kernel.org
Subject: Re: [PATCH 05/10] KConfig: Add KConfig entries for Labeled NFS

On Wed, Jul 07, 2010 at 10:31:21AM -0400, David P. Quigley wrote:
> This patch adds two entries into the fs/KConfig file. The first entry
> NFS_V4_SECURITY_LABEL enables security label support for the NFSv4 client while
> the second entry NFSD_V4_SECURITY_LABEL enables security labeling support on
> the server side.

Will there also be some way to turn these on and off at run-time (maybe
for particular exports or filesystems?)

And if so, will there be any reason not to have this on all the time?  I
don't think we'll want a config option for every future possible NFSv4.x
feature.

--b.

> 
> Signed-off-by: Matthew N. Dodd <Matthew.Dodd@...rta.com>
> Signed-off-by: David P. Quigley <dpquigl@...ho.nsa.gov>
> ---
>  fs/nfs/Kconfig  |   16 ++++++++++++++++
>  fs/nfsd/Kconfig |   13 +++++++++++++
>  2 files changed, 29 insertions(+), 0 deletions(-)
> 
> diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
> index a43d07e..67b158c 100644
> --- a/fs/nfs/Kconfig
> +++ b/fs/nfs/Kconfig
> @@ -83,6 +83,22 @@ config NFS_V4_1
>  
>  	  Unless you're an NFS developer, say N.
>  
> +config NFS_V4_SECURITY_LABEL
> +	bool "Provide Security Label support for NFSv4 client"
> +	depends on NFS_V4 && SECURITY
> +	help
> +
> +	Say Y here if you want enable fine-grained security label attribute
> +	support for NFS version 4.  Security labels allow security modules like
> +	SELinux and Smack to label files to facilitate enforcement of their policies.
> +	Without this an NFSv4 mount will have the same label on each file.
> +
> +	If you do not wish to enable fine-grained security labels SELinux or
> +	Smack policies on NFSv4 files, say N.
> +
> +
> +	  If unsure, say N.
> +
>  config ROOT_NFS
>  	bool "Root file system on NFS"
>  	depends on NFS_FS=y && IP_PNP
> diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig
> index 503b9da..3a282f8 100644
> --- a/fs/nfsd/Kconfig
> +++ b/fs/nfsd/Kconfig
> @@ -79,3 +79,16 @@ config NFSD_V4
>  	  available from http://linux-nfs.org/.
>  
>  	  If unsure, say N.
> +
> +config NFSD_V4_SECURITY_LABEL
> +	bool "Provide Security Label support for NFSv4 server"
> +	depends on NFSD_V4 && SECURITY
> +	help
> +
> +	Say Y here if you want enable fine-grained security label attribute
> +	support for NFS version 4.  Security labels allow security modules like
> +	SELinux and Smack to label files to facilitate enforcement of their policies.
> +	Without this an NFSv4 mount will have the same label on each file.
> +
> +	If you do not wish to enable fine-grained security labels SELinux or
> +	Smack policies on NFSv4 files, say N.
> -- 
> 1.6.2.5
> 
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