linux-kernel - Re: [PATCH] selinux: Mark array 'labeling_behaviors' as __maybe

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Date:   Fri, 19 May 2017 11:09:18 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Matthias Kaehlcke <mka@...omium.org>
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>, selinux@...ho.nsa.gov,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selinux: Mark array 'labeling_behaviors' as __maybe_unused

On Thu, May 18, 2017 at 3:07 PM, Matthias Kaehlcke <mka@...omium.org> wrote:
> The array is only referenced in an ARRAY_SIZE() statement. Adding the
> attribute fixes the following warning when building with clang:
>
> security/selinux/hooks.c:338:20: error: variable 'labeling_behaviors'
>     is not needed and will not be emitted
>     [-Werror,-Wunneeded-internal-declaration]
>
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
>  security/selinux/hooks.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

The fact that we only reference labeling_behaviors in one spot, and
even then we only use it as a parameter to ARRAY_SIZE(), makes me
believe we may be able to get rid of labeling_behaviors and use
SECURITY_FS_USE_MAX in its place.

Anyone working on any patches which make use of labeling_behaviors?

> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index e67a526d1f30..450ff9f3161c 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -400,7 +400,7 @@ static void superblock_free_security(struct super_block *sb)
>
>  /* The file system's label must be initialized prior to use. */
>
> -static const char *labeling_behaviors[7] = {
> +static const char * __maybe_unused labeling_behaviors[7] = {
>         "uses xattr",
>         "uses transition SIDs",
>         "uses task SIDs",
> --
> 2.13.0.303.g4ebf302169-goog

-- 
paul moore
www.paul-moore.com