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

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Date:   Fri, 05 Jun 2020 14:46:22 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
        linux-integrity@...r.kernel.org
Cc:     tusharsu@...ux.microsoft.com, linux-kernel@...r.kernel.org,
        Paul Moore <paul@...l-moore.com>
Subject: Re: [PATCH] IMA: Add log statements for failure conditions

[Cc'ing Paul Moore]

Hi Lakshmi,

On Thu, 2020-06-04 at 09:32 -0700, Lakshmi Ramasubramanian wrote:
> The final log statement in process_buffer_measurement() for failure
> condition is at debug level. This does not log the message unless
> the system log level is raised which would significantly increase
> the messages in the system log. Change this log message to error level,
> and add eventname and ima_hooks enum to the message for better triaging
> failures in the function.
> 
> ima_alloc_key_entry() does not log a message for failure condition.
> Add an error message for failure condition in this function.
> 
> Signed-off-by: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>

These messages should probably be turned into audit messages.  Look at
integerity_audit_msg().

Mimi

> ---
>  security/integrity/ima/ima_main.c       | 3 ++-
>  security/integrity/ima/ima_queue_keys.c | 2 ++
>  2 files changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
> index 9d0abedeae77..3b371f31597b 100644
> --- a/security/integrity/ima/ima_main.c
> +++ b/security/integrity/ima/ima_main.c
> @@ -756,7 +756,8 @@ void process_buffer_measurement(const void *buf, int size,
>  
>  out:
>  	if (ret < 0)
> -		pr_devel("%s: failed, result: %d\n", __func__, ret);
> +		pr_err("%s failed. eventname: %s, func: %d, result: %d\n",
> +		       __func__, eventname, func, ret);
>  
>  	return;
>  }
> diff --git a/security/integrity/ima/ima_queue_keys.c b/security/integrity/ima/ima_queue_keys.c
> index cb3e3f501593..e51d0eb08d8a 100644
> --- a/security/integrity/ima/ima_queue_keys.c
> +++ b/security/integrity/ima/ima_queue_keys.c
> @@ -88,6 +88,8 @@ static struct ima_key_entry *ima_alloc_key_entry(struct key *keyring,
>  
>  out:
>  	if (rc) {
> +		pr_err("%s failed. keyring: %s, result: %d\n",
> +		       __func__, keyring->description, rc);
>  		ima_free_key_entry(entry);
>  		entry = NULL;
>  	}