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Subject: Re: [PATCH] apparmor: remove redundant pointer 'info'
To:     Colin King <colin.king@canonical.com>,
        James Morris <jmorris@namei.org>,
        "Serge E . Hallyn" <serge@hallyn.com>,
        linux-security-module@vger.kernel.org
Cc:     kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20180714161905.5403-1-colin.king@canonical.com>
From:   John Johansen <john.johansen@canonical.com>
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Organization: Canonical
Message-ID: <5702474d-5215-cdea-8d77-24f45fef92cc@canonical.com>
Date:   Fri, 20 Jul 2018 03:31:57 -0700
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In-Reply-To: <20180714161905.5403-1-colin.king@canonical.com>
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On 07/14/2018 09:19 AM, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
> 
> Pointer 'info' is being assigned but is never used hence it is
> redundant and can be removed.
> 
> Cleans up clang warning:
> warning: variable 'info' set but not used [-Wunused-but-set-variable]
> 
NAK,

real problem wrong fix, instead of deleting the additional context info
we need to be auditing it

diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c
index 098d546d8253..08c88de0ffda 100644
--- a/security/apparmor/domain.c
+++ b/security/apparmor/domain.c
@@ -1036,7 +1036,7 @@ static struct aa_label *build_change_hat(struct aa_profile *profile,
 audit:
 	aa_audit_file(profile, &nullperms, OP_CHANGE_HAT, AA_MAY_CHANGEHAT,
 		      name, hat ? hat->base.hname : NULL,
-		      hat ? &hat->label : NULL, GLOBAL_ROOT_UID, NULL,
+		      hat ? &hat->label : NULL, GLOBAL_ROOT_UID, info,
 		      error);
 	if (!hat || (error && error != -ENOENT))
 		return ERR_PTR(error);

I pushed this fix into apparmor-next


> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
>  security/apparmor/domain.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c
> index 098d546d8253..410d9ce09861 100644
> --- a/security/apparmor/domain.c
> +++ b/security/apparmor/domain.c
> @@ -1006,7 +1006,6 @@ static struct aa_label *build_change_hat(struct aa_profile *profile,
>  					 const char *name, bool sibling)
>  {
>  	struct aa_profile *root, *hat = NULL;
> -	const char *info = NULL;
>  	int error = 0;
>  
>  	if (sibling && PROFILE_IS_HAT(profile)) {
> @@ -1014,7 +1013,6 @@ static struct aa_label *build_change_hat(struct aa_profile *profile,
>  	} else if (!sibling && !PROFILE_IS_HAT(profile)) {
>  		root = aa_get_profile(profile);
>  	} else {
> -		info = "conflicting target types";
>  		error = -EPERM;
>  		goto audit;
>  	}
> @@ -1025,10 +1023,8 @@ static struct aa_label *build_change_hat(struct aa_profile *profile,
>  		if (COMPLAIN_MODE(profile)) {
>  			hat = aa_new_null_profile(profile, true, name,
>  						  GFP_KERNEL);
> -			if (!hat) {
> -				info = "failed null profile create";
> +			if (!hat)
>  				error = -ENOMEM;
> -			}
>  		}
>  	}
>  	aa_put_profile(root);
>