netdev - Re: [PATCH 1/6] Security: define security_sk

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Message-ID: <4E415CB3.8020202@schaufler-ca.com>
Date:	Tue, 09 Aug 2011 09:13:39 -0700
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	rongqing.li@...driver.com
CC:	netdev@...r.kernel.org, selinux@...ho.nsa.gov,
	linux-security-module@...r.kernel.org, sds@...ho.nsa.gov,
	Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [PATCH 1/6] Security: define security_sk_getsecid.

On 8/9/2011 12:28 AM, rongqing.li@...driver.com wrote:
> From: Roy.Li <rongqing.li@...driver.com>
>
> Define security_sk_getsecid to get the security id of a sock.

Why are you requesting the secid when you're just going to
use it to get the secctx? Why not ask for that directly?
Is there ever a case where you only want the secid?

>
> Signed-off-by: Roy.Li <rongqing.li@...driver.com>
> ---
>  include/linux/security.h |    6 ++++++
>  security/security.c      |    6 ++++++
>  2 files changed, 12 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/security.h b/include/linux/security.h
> index ebd2a53..739ac39 100644
> --- a/include/linux/security.h
> +++ b/include/linux/security.h
> @@ -2560,6 +2560,7 @@ int security_sk_alloc(struct sock *sk, int family, gfp_t priority);
>  void security_sk_free(struct sock *sk);
>  void security_sk_clone(const struct sock *sk, struct sock *newsk);
>  void security_sk_classify_flow(struct sock *sk, struct flowi *fl);
> +void security_sk_getsecid(struct sock *sk, u32 *secid);
>  void security_req_classify_flow(const struct request_sock *req, struct flowi *fl);
>  void security_sock_graft(struct sock*sk, struct socket *parent);
>  int security_inet_conn_request(struct sock *sk,
> @@ -2701,6 +2702,11 @@ static inline void security_sk_classify_flow(struct sock *sk, struct flowi *fl)
>  {
>  }
>  
> +static inline void security_sk_getsecid(struct sock *sk, u32 *secid)
> +{
> +	*secid = 0;
> +}
> +
>  static inline void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
>  {
>  }
> diff --git a/security/security.c b/security/security.c
> index 0e4fccf..b0e0825 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -1104,6 +1104,12 @@ void security_sk_classify_flow(struct sock *sk, struct flowi *fl)
>  }
>  EXPORT_SYMBOL(security_sk_classify_flow);
>  
> +void security_sk_getsecid(struct sock *sk, u32 *secid)
> +{
> +	security_ops->sk_getsecid(sk, secid);
> +}
> +EXPORT_SYMBOL(security_sk_getsecid);
> +
>  void security_req_classify_flow(const struct request_sock *req, struct flowi *fl)
>  {
>  	security_ops->req_classify_flow(req, fl);

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