linux-kernel - Re: [PATCH] selinux: ss: mls: Remove unused function

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Date:	Mon, 12 Jan 2015 15:29:16 -0500
From:	Paul Moore <paul@...l-moore.com>
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Cc:	Stephen Smalley <sds@...ho.nsa.gov>,
	Eric Paris <eparis@...isplace.org>,
	James Morris <james.l.morris@...cle.com>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Dave Jones <davej@...hat.com>, selinux@...ho.nsa.gov,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selinux: ss: mls: Remove unused function

On Sunday, January 11, 2015 11:44:30 PM Rickard Strandqvist wrote:
> Remove the function mls_import_netlbl_cat() that is not used anywhere.
> 
> This was partially found by using a static code analysis program called
> cppcheck.
> 
> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
> ---
>  security/selinux/ss/mls.c |   38 --------------------------------------
>  security/selinux/ss/mls.h |    7 -------
>  2 files changed, 45 deletions(-)

Thanks for bringing this up and sending a patch.

However, what we should probably do is take the existing MLS category code in 
security_netlbl_secattr_to_sid() and reconcile it with the code in 
mls_import_netlbl_cat() and convert security_netlbl_secattr_to_sid() to using
the mls_import_netlbl_cat() function.

Is that something you want to try?  If not, let me know and we'll work on it.

> diff --git a/security/selinux/ss/mls.c b/security/selinux/ss/mls.c
> index d307b37..c01c755 100644
> --- a/security/selinux/ss/mls.c
> +++ b/security/selinux/ss/mls.c
> @@ -631,42 +631,4 @@ int mls_export_netlbl_cat(struct context *context,
> 
>  	return rc;
>  }
> -
> -/**
> - * mls_import_netlbl_cat - Import the MLS categories from NetLabel
> - * @context: the security context
> - * @secattr: the NetLabel security attributes
> - *
> - * Description:
> - * Copy the NetLabel security attributes into the SELinux context; since
> the - * NetLabel security attribute only contains a single MLS category use
> it for - * both the low and high categories of the context.  Returns zero
> on success, - * negative values on failure.
> - *
> - */
> -int mls_import_netlbl_cat(struct context *context,
> -			  struct netlbl_lsm_secattr *secattr)
> -{
> -	int rc;
> -
> -	if (!policydb.mls_enabled)
> -		return 0;
> -
> -	rc = ebitmap_netlbl_import(&context->range.level[0].cat,
> -				   secattr->attr.mls.cat);
> -	if (rc != 0)
> -		goto import_netlbl_cat_failure;
> -
> -	rc = ebitmap_cpy(&context->range.level[1].cat,
> -			 &context->range.level[0].cat);
> -	if (rc != 0)
> -		goto import_netlbl_cat_failure;
> -
> -	return 0;
> -
> -import_netlbl_cat_failure:
> -	ebitmap_destroy(&context->range.level[0].cat);
> -	ebitmap_destroy(&context->range.level[1].cat);
> -	return rc;
> -}
>  #endif /* CONFIG_NETLABEL */
> diff --git a/security/selinux/ss/mls.h b/security/selinux/ss/mls.h
> index e4369e3..11d3c8f 100644
> --- a/security/selinux/ss/mls.h
> +++ b/security/selinux/ss/mls.h
> @@ -62,8 +62,6 @@ void mls_import_netlbl_lvl(struct context *context,
>  			   struct netlbl_lsm_secattr *secattr);
>  int mls_export_netlbl_cat(struct context *context,
>  			  struct netlbl_lsm_secattr *secattr);
> -int mls_import_netlbl_cat(struct context *context,
> -			  struct netlbl_lsm_secattr *secattr);
>  #else
>  static inline void mls_export_netlbl_lvl(struct context *context,
>  					 struct netlbl_lsm_secattr *secattr)
> @@ -80,11 +78,6 @@ static inline int mls_export_netlbl_cat(struct context
> *context, {
>  	return -ENOMEM;
>  }
> -static inline int mls_import_netlbl_cat(struct context *context,
> -					struct netlbl_lsm_secattr *secattr)
> -{
> -	return -ENOMEM;
> -}
>  #endif
> 
>  #endif	/* _SS_MLS_H */

-- 
paul moore
www.paul-moore.com

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