linux-kernel - Re: [PATCH] LSM: add static to security

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Date:	Fri, 19 Feb 2010 08:47:46 -0500
From:	Stephen Smalley <sds@...ho.nsa.gov>
To:	wzt wzt <wzt.wzt@...il.com>
Cc:	linux-kernel@...r.kernel.org, jmorris@...ei.org,
	eparis@...isplace.org, lsm <linux-security-module@...r.kernel.org>,
	Greg Kroah-Hartman <greg@...ah.com>
Subject: Re: [PATCH] LSM: add static to security_ops variable

On Fri, 2010-02-19 at 19:40 +0800, wzt wzt wrote:
> I rewrite the patch, thx.

Patch description needs to be descriptive, e.g.:
"Enhance the security framework to support resetting the active security
module.  This eliminates the need for direct use of the security_ops
variable outside of security.c, so make security_ops static."

Subject line could be more descriptive too, and likely just use
security: as the prefix.

You also need a Signed-off-by line, with a real name.

Also, see the comments below.

> ---
>  include/linux/security.h |    2 ++
>  security/security.c      |    7 ++++++-
>  security/selinux/hooks.c |   14 ++------------
>  3 files changed, 10 insertions(+), 13 deletions(-)
> 

> diff --git a/security/security.c b/security/security.c
> index 122b748..3e4c4bc 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -26,7 +26,7 @@ static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] =
>  extern struct security_operations default_security_ops;
>  extern void security_fixup_ops(struct security_operations *ops);
> 
> -struct security_operations *security_ops;      /* Initialized to NULL */
> +static struct security_operations *security_ops;       /* Initialized
> to NULL */

You can drop the /* Initialized to NULL */ comment since it is now
static.

> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index 9a2ee84..e9599fd 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -93,6 +93,7 @@
> 
>  extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
>  extern struct security_operations *security_ops;
> +extern struct security_operations default_security_ops;

We don't need this extern declaration.

The next obvious cleanup would be to make default_security_ops static.
That will require some code reorganization though - it is presently
defined in capability.c and manipulated by security.c.

-- 
Stephen Smalley
National Security Agency

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