linux-kernel - Re: [PATCH] security/integrity: Include __func_

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Date:   Mon, 3 Feb 2020 11:23:09 -0800
From:   Casey Schaufler <casey@...aufler-ca.com>
To:     Joe Perches <joe@...ches.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Mimi Zohar <zohar@...ux.ibm.com>, jmorris@...ei.org,
        serge@...lyn.com, mpe@...erman.id.au, erichte@...ux.ibm.com,
        nayna@...ux.ibm.com, yuehaibing@...wei.com
Cc:     linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [PATCH] security/integrity: Include __func__ in messages for
 easier debug

On 2/3/2020 11:02 AM, Joe Perches wrote:
> On Mon, 2020-02-03 at 11:55 -0700, Shuah Khan wrote:
>> On 2/3/20 6:21 AM, Mimi Zohar wrote:
>>> On Wed, 2020-01-29 at 19:08 -0800, Joe Perches wrote:
>>>> On Wed, 2020-01-29 at 19:01 -0700, Shuah Khan wrote:
>>>>> Change messages to messages to make it easier to debug. The following
>>>>> error message isn't informative enough to figure out what failed.
>>>>> Change messages to include function information.
>>>>>
>>>>> Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
>>>>> ---
>>>>>   .../integrity/platform_certs/load_powerpc.c     | 14 ++++++++------
>>>>>   security/integrity/platform_certs/load_uefi.c   | 17 ++++++++++-------
>>>>>   2 files changed, 18 insertions(+), 13 deletions(-)
>>>>>
>>>>> diff --git a/security/integrity/platform_certs/load_powerpc.c b/security/integrity/platform_certs/load_powerpc.c
>>>> perhaps instead add #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>>>> so all the pr_<level> logging is more specific.
>>>>
>>>> This would prefix all pr_<level> output with "integrity: "
>> Joe! Sorry for the delay in getting back to you.
>>
>>> Agreed.  Joe, could you post a patch with a proper patch description
>>> for this?
>>>
>> I have been looking into this a bit more and there is an opportunity
>> here to add #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt to integrity.h
>> and get rid of duplicate defines.
> That might work but:
>
> $ git grep --name-only 'integrity\.h' security | xargs grep pr_fmt
> security/integrity/digsig.c:#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> security/integrity/digsig_asymmetric.c:#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> security/integrity/evm/evm_main.c:#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> security/security.c:#define pr_fmt(fmt) "LSM: " fmt
>
> Here security.c already uses "LSM: "
>
> Does anyone care about the LSM: prefix?

Yes.