linux-kernel - Re: [PATCH try #2] security: Convert LSM into a static interface

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Date:	Mon, 25 Jun 2007 12:59:29 -0400
From:	Stephen Smalley <sds@...ho.nsa.gov>
To:	James Morris <jmorris@...ei.org>
Cc:	Chris Wright <chrisw@...s-sol.org>,
	linux-security-module@...r.kernel.org,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Andrew Morgan <agm@...gle.com>,
	Andrew Morton <akpm@...gle.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Greg KH <greg@...ah.com>, Eric Paris <eparis@...hat.com>
Subject: Re: [PATCH try #2] security: Convert LSM into a static interface

On Mon, 2007-06-25 at 00:33 -0400, James Morris wrote:
> Convert LSM into a static interface, as the ability to unload a security 
> module is not required by in-tree users and potentially complicates the 
> overall security architecture.
> 
> Needlessly exported LSM symbols have been unexported, to help reduce API
> abuse.
> 
> Parameters for the capability and root_plug modules are now specified at 
> boot.
> 
> The SECURITY_FRAMEWORK_VERSION macro has also been removed.
> 
> Signed-off-by: James Morris <jmorris@...ei.org>
> ---

> diff --git a/security/security.c b/security/security.c
> index fc8601b..e49dae2 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -172,8 +170,5 @@ int mod_unreg_security(const char *name, struct security_operations *ops)
>  	return security_ops->unregister_security(name, ops);
>  }
>  
> -EXPORT_SYMBOL_GPL(register_security);
> -EXPORT_SYMBOL_GPL(unregister_security);
> -EXPORT_SYMBOL_GPL(mod_reg_security);
> -EXPORT_SYMBOL_GPL(mod_unreg_security);
> +/* Export required for modular use of security.h inlines */
>  EXPORT_SYMBOL(security_ops);

I think you want to eliminate that last export too, by taking the
security hooks that are called by modules into out-of-line wrapper
functions in security.c rather than directly referencing security_ops.

-- 
Stephen Smalley
National Security Agency

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