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From: Tushar Sugandhi <tusharsu@linux.microsoft.com>
To: Mimi Zohar <zohar@linux.ibm.com>,
	joe@perches.com, skhan@linuxfoundation.org,
	linux-integrity@vger.kernel.org
Cc: sashal@kernel.org, nramas@linux.microsoft.com,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 2/3] IMA: Add log statements for failure conditions.
Date: Wed, 12 Feb 2020 14:30:26 -0800	[thread overview]
Message-ID: <ce89d382-8e8b-71d0-5271-4db83d324f94@linux.microsoft.com> (raw)
In-Reply-To: <1581518823.8515.49.camel@linux.ibm.com>



On 2020-02-12 6:47 a.m., Mimi Zohar wrote:
> Hi Tushar,
> 
> Please remove the period at the end of the  Subject line.
Thanks. I will fix it in the next iteration.
> 
> On Tue, 2020-02-11 at 15:14 -0800, Tushar Sugandhi wrote:
>> process_buffer_measurement() does not have log messages for failure
>> conditions.
>>
>> This change adds a log statement in the above function.
> 
> I agree some form of notification needs to be added.  The question is
> whether the failure should be audited or a kernel message emitted.
>   IMA emits audit messages (integrity_audit_msg) for a number of
> reasons - on failure to calculate a file hash, invalid policy rules,
> failure to communicate with the TPM, signature verification errors,
> etc.
I believe both IMA audit messages and kernel message should be emitted -
for better discoverability and diagnosability.
> 
>>
>> Signed-off-by: Tushar Sugandhi <tusharsu@linux.microsoft.com>
>> Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
>> Suggested-by: Joe Perches <joe@perches.com>
>> ---
>>   security/integrity/ima/ima_main.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
>> index 9fe949c6a530..6e1576d9eb48 100644
>> --- a/security/integrity/ima/ima_main.c
>> +++ b/security/integrity/ima/ima_main.c
>> @@ -757,6 +757,9 @@ void process_buffer_measurement(const void *buf, int size,
>>   		ima_free_template_entry(entry);
>>   
>>   out:
>> +	if (ret < 0)
>> +		pr_err("%s: failed, result: %d\n", __func__, ret);
>> +
>>   	return;
>>   }
>>   
> 
> With 3/3 "IMA: Add module name and base name prefix to log", the
> resulting message will be "KBUILD_MODNAME: KBUILD_BASENAME: func:".
>   Isn't that a bit much?
> 
For this specific message, it will look like below.
"ima: ima_main: process_buffer_measurement: failed, result: %d"

In general, adding KBUILD_BASENAME seems helpful to pinpoint the 
location of the issue.


> Mimi
> 

  reply	other threads:[~2020-02-12 22:30 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-11 23:14 [PATCH v3 0/3] IMA: improve log messages in IMA Tushar Sugandhi
2020-02-11 23:14 ` [PATCH v3 1/3] IMA: Update KBUILD_MODNAME for IMA files to ima Tushar Sugandhi
2020-02-12 14:49   ` Mimi Zohar
2020-02-12 22:25     ` Tushar Sugandhi
2020-02-11 23:14 ` [PATCH v3 2/3] IMA: Add log statements for failure conditions Tushar Sugandhi
2020-02-12 14:47   ` Mimi Zohar
2020-02-12 22:30     ` Tushar Sugandhi [this message]
2020-02-13  0:21       ` Mimi Zohar
2020-02-13 21:01         ` Tushar Sugandhi
2020-02-11 23:14 ` [PATCH v3 3/3] IMA: Add module name and base name prefix to log Tushar Sugandhi
2020-02-12 14:29   ` Mimi Zohar
2020-02-12 15:26     ` James Bottomley
2020-02-12 15:47       ` Joe Perches
2020-02-12 22:52       ` Shuah Khan
2020-02-13  0:38         ` Mimi Zohar
2020-02-13  0:56           ` Tushar Sugandhi
2020-02-12 15:23 ` [PATCH v3 0/3] IMA: improve log messages in IMA Mimi Zohar
2020-02-12 22:22   ` Tushar Sugandhi

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