linux-kernel - Re: [PATCH 26/33] apparmor: use match

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Date:   Mon, 21 May 2018 08:33:52 -0700
From:   John Johansen <john.johansen@...onical.com>
To:     Yisheng Xie <xieyisheng1@...wei.com>, linux-kernel@...r.kernel.org
Cc:     James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH 26/33] apparmor: use match_string() helper

On 05/21/2018 04:58 AM, Yisheng Xie wrote:
> match_string() returns the index of an array for a matching string,
> which can be used intead of open coded variant.
> 

Andy Shevchenko patch to do the same thing is already in apparmor-next

> Cc: John Johansen <john.johansen@...onical.com>
> Cc: James Morris <jmorris@...ei.org>
> Cc: "Serge E. Hallyn" <serge@...lyn.com>
> Cc: linux-security-module@...r.kernel.org
> Signed-off-by: Yisheng Xie <xieyisheng1@...wei.com>
> ---
>  security/apparmor/lsm.c | 25 +++++++++++--------------
>  1 file changed, 11 insertions(+), 14 deletions(-)
> 
> diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
> index ce2b89e..9b5904f 100644
> --- a/security/apparmor/lsm.c
> +++ b/security/apparmor/lsm.c
> @@ -1378,14 +1378,12 @@ static int param_set_audit(const char *val, const struct kernel_param *kp)
>  	if (apparmor_initialized && !policy_admin_capable(NULL))
>  		return -EPERM;
>  
> -	for (i = 0; i < AUDIT_MAX_INDEX; i++) {
> -		if (strcmp(val, audit_mode_names[i]) == 0) {
> -			aa_g_audit = i;
> -			return 0;
> -		}
> -	}
> +	i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val);
> +	if (i < 0)
> +		return -EINVAL;
>  
> -	return -EINVAL;
> +	aa_g_audit = i;
> +	return 0;
>  }
>  
>  static int param_get_mode(char *buffer, const struct kernel_param *kp)
> @@ -1409,14 +1407,13 @@ static int param_set_mode(const char *val, const struct kernel_param *kp)
>  	if (apparmor_initialized && !policy_admin_capable(NULL))
>  		return -EPERM;
>  
> -	for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) {
> -		if (strcmp(val, aa_profile_mode_names[i]) == 0) {
> -			aa_g_profile_mode = i;
> -			return 0;
> -		}
> -	}
> +	i = match_string(aa_profile_mode_names,
> +			 APPARMOR_MODE_NAMES_MAX_INDEX, val);
> +	if (i)
> +		return -EINVAL;
>  
> -	return -EINVAL;
> +	aa_g_profile_mode = i;
> +	return 0;
>  }
>  
>  /*
>