linux-kernel - Re: [PATCH] IMA: Add log statements for failure conditions.

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Message-Id: <1581253027.5585.671.camel@linux.ibm.com>
Date:   Sun, 09 Feb 2020 07:57:07 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Tushar Sugandhi <tusharsu@...ux.microsoft.com>,
        linux-integrity@...r.kernel.org
Cc:     sashal@...nel.org, nramas@...ux.microsoft.com,
        linux-kernel@...r.kernel.org, Joe Perches <joe@...ches.com>
Subject: Re: [PATCH] IMA: Add log statements for failure conditions.

Hi Tushar,

On Fri, 2020-02-07 at 11:53 -0800, Tushar Sugandhi wrote:
> process_buffer_measurement() and ima_alloc_key_entry()
> functions do not have log messages for failure conditions.
> 
> This change adds log statements in the above functions. 
> 
> Signed-off-by: Tushar Sugandhi <tusharsu@...ux.microsoft.com>
> Reviewed-by: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>

The two patches you posted are related.  Please group them as a patch
set, making this patch 2/2.

In addition, as Shuah Khan suggested for the security/integrity/
directory, "there is an opportunity here to add #define pr_fmt(fmt)
KBUILD_MODNAME ": " fmt to integrity.h and get rid of duplicate
defines."  With Joe Perches patch (waiting for it to be re-posted),
are all the pr_fmt definitions needed in each file in the
integrity/ima directory?

> ---
>  security/integrity/ima/ima_main.c       | 4 ++++
>  security/integrity/ima/ima_queue_keys.c | 2 ++
>  2 files changed, 6 insertions(+)
> 
> diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
> index 9fe949c6a530..afab796fb765 100644
> --- a/security/integrity/ima/ima_main.c
> +++ b/security/integrity/ima/ima_main.c
> @@ -757,6 +757,10 @@ void process_buffer_measurement(const void *buf, int size,
>  		ima_free_template_entry(entry);
>  
>  out:
> +	if (ret < 0)
> +		pr_err("Process buffer measurement failed, result: %d\n",
> +			ret);

There's no reason to split the statement like this.  The joined line
is less than 80 characters.

> +
>  	return;
>  }
>  
> diff --git a/security/integrity/ima/ima_queue_keys.c b/security/integrity/ima/ima_queue_keys.c
> index c87c72299191..2cc52f17ea81 100644
> --- a/security/integrity/ima/ima_queue_keys.c
> +++ b/security/integrity/ima/ima_queue_keys.c
> @@ -90,6 +90,8 @@ static struct ima_key_entry *ima_alloc_key_entry(struct key *keyring,
>  
>  out:
>  	if (rc) {
> +		pr_err("Key entry allocation failed, result: %d\n",
> +			rc);

ditto

>  		ima_free_key_entry(entry);
>  		entry = NULL;
>  	}

thanks,

Mimi