linux-kernel - Re: [PATCH 2/2] file capabilities: turn on by default

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Message-Id: <20080922120347.60a9171a.randy.dunlap@oracle.com>
Date:	Mon, 22 Sep 2008 12:03:47 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	linux-security-module@...r.kernel.org,
	James Morris <jmorris@...hat.com>,
	Andrew Morgan <morgan@...nel.org>,
	Andreas Gruenbacher <agruen@...e.de>,
	Andrew Morton <akpm@...l.org>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: [PATCH 2/2] file capabilities: turn on by default

On Mon, 22 Sep 2008 13:49:01 -0500 Serge E. Hallyn wrote:

> 
> Now that file capabilities can be turned off at boot, go ahead
> and compile them into the kernel by default by making
> CONFIG_SECURITY_FILE_CAPABILITIES=y the default.

Hi,

How much code does this add to everyone's kernel?

> Note that the boot flag no_file_caps must be specified to turn
> file capabilities off, as by default they are on.  So the
> default behavior is in fact changed.

If most people want this enable, using 'no_file_caps' makes
some sense.  OTOH, if most people don't want/use it, then
having a 'file_caps_on' option would make more sense.

Do you have any (unbiased :) ideas about this?

Thanks.

> Signed-off-by: Serge Hallyn <serue@...ibm.com>
> Acked-by: Andrew G. Morgan <morgan@...nel.org>
> ---
>  security/Kconfig |    7 +++++--
>  1 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/security/Kconfig b/security/Kconfig
> index 5592939..6fbb233 100644
> --- a/security/Kconfig
> +++ b/security/Kconfig
> @@ -75,12 +75,15 @@ config SECURITY_NETWORK_XFRM
>  
>  config SECURITY_FILE_CAPABILITIES
>  	bool "File POSIX Capabilities"
> -	default n
> +	default y
>  	help
>  	  This enables filesystem capabilities, allowing you to give
>  	  binaries a subset of root's powers without using setuid 0.
>  
> -	  If in doubt, answer N.
> +	  You can still boot with the no_file_caps option to disable
> +	  file capabilities.
> +
> +	  If in doubt, answer Y.
>  
>  config SECURITY_ROOTPLUG
>  	bool "Root Plug Support"


---
~Randy
--
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