From: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
To: Mimi Zohar <zohar@linux.ibm.com>,
Paul Moore <paul@paul-moore.com>, Sasha Levin <sashal@kernel.org>
Cc: Tushar Sugandhi <tusharsu@linux.microsoft.com>,
Stephen Smalley <stephen.smalley.work@gmail.com>,
casey@schaufler-ca.com, agk@redhat.com, snitzer@redhat.com,
gmazyland@gmail.com, tyhicks@linux.microsoft.com,
James Morris <jmorris@namei.org>,
linux-integrity@vger.kernel.org, selinux@vger.kernel.org,
linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org, dm-devel@redhat.com
Subject: Re: [PATCH v10 8/8] selinux: include a consumer of the new IMA critical data hook
Date: Thu, 14 Jan 2021 09:48:35 -0800 [thread overview]
Message-ID: <e883298b-1027-2a58-dcf8-fc940ebc27ff@linux.microsoft.com> (raw)
In-Reply-To: <f42d49d2e876379c0ef6e31a34027be95ffb1375.camel@linux.ibm.com>
On 1/14/21 8:50 AM, Mimi Zohar wrote:
> On Thu, 2021-01-14 at 11:44 -0500, Mimi Zohar wrote:
>> [Cc'ing Sasha]
>>
>> Hi Lakshmi,
>>
>> On Thu, 2021-01-14 at 08:22 -0800, Lakshmi Ramasubramanian wrote:
>>> On 1/13/21 6:49 PM, Mimi Zohar wrote:
>>
>>>>>> Lakshmi is trying to address the situation where an event changes a
>>>>>> value, but then is restored to the original value. The original and
>>>>>> subsequent events are measured, but restoring to the original value
>>>>>> isn't re-measured. This isn't any different than when a file is
>>>>>> modified and then reverted.
>>>>>>
>>>>>> Instead of changing the name like this, which doesn't work for files,
>>>>>> allowing duplicate measurements should be generic, based on policy.
>>>>>
>>>>> Perhaps it is just the end of the day and I'm a bit tired, but I just
>>>>> read all of the above and I have no idea what your current thoughts
>>>>> are regarding this patch.
>>>>
>>>> Other than appending the timestamp, which is a hack, the patch is fine.
>>>> Support for re-measuring an event can be upstreamed independently.
>>>>
>>>
>>> Thanks for clarifying the details related to duplicate measurement
>>> detection and re-measuring.
>>>
>>> I will keep the timestamp for the time being, even though its a hack, as
>>> it helps with re-measuring state changes in SELinux. We will add support
>>> for "policy driven" re-measurement as a subsequent patch series.
>>
>> Once including the timestamp is upstreamed, removing it will be
>> difficult, especially if different userspace applications are dependent
>> on it. Unless everyone is on board that removing the timestamp
>> wouldn't be considered a regression, it cannot be upstreamed.
>
> Feel free to just re-post just this one patch. Otherwise the patch set
> looks good.
>
> thanks,
>
Sounds good Mimi - I will remove the timestamp and re-post the selinux
patch.
thanks,
-lakshmi
next prev parent reply other threads:[~2021-01-14 17:49 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-08 4:07 [PATCH v10 0/8] IMA: support for measuring kernel integrity critical data Tushar Sugandhi
2021-01-08 4:07 ` [PATCH v10 1/8] IMA: generalize keyring specific measurement constructs Tushar Sugandhi
2021-01-08 4:07 ` [PATCH v10 2/8] IMA: add support to measure buffer data hash Tushar Sugandhi
2021-01-08 4:07 ` [PATCH v10 3/8] IMA: define a hook to measure kernel integrity critical data Tushar Sugandhi
2021-01-08 4:07 ` [PATCH v10 4/8] IMA: add policy rule to measure " Tushar Sugandhi
2021-01-08 4:07 ` [PATCH v10 5/8] IMA: limit critical data measurement based on a label Tushar Sugandhi
2021-01-14 2:09 ` Mimi Zohar
2021-01-14 17:57 ` Tushar Sugandhi
2021-01-08 4:07 ` [PATCH v10 6/8] IMA: extend critical data hook to limit the " Tushar Sugandhi
2021-01-08 4:07 ` [PATCH v10 7/8] IMA: define a builtin critical data measurement policy Tushar Sugandhi
2021-01-08 4:07 ` [PATCH v10 8/8] selinux: include a consumer of the new IMA critical data hook Tushar Sugandhi
2021-01-12 16:27 ` Paul Moore
2021-01-12 18:25 ` Lakshmi Ramasubramanian
2021-01-13 19:13 ` Mimi Zohar
2021-01-13 19:19 ` Paul Moore
2021-01-13 21:11 ` Mimi Zohar
2021-01-13 22:10 ` Paul Moore
2021-01-13 23:10 ` Mimi Zohar
2021-01-14 2:40 ` Paul Moore
2021-01-14 2:49 ` Mimi Zohar
2021-01-14 16:22 ` Lakshmi Ramasubramanian
2021-01-14 16:44 ` Mimi Zohar
2021-01-14 16:50 ` Mimi Zohar
2021-01-14 17:48 ` Lakshmi Ramasubramanian [this message]
2021-01-14 19:21 ` Lakshmi Ramasubramanian
2021-01-14 16:51 ` Paul Moore
2021-01-15 12:54 ` [PATCH v10 0/8] IMA: support for measuring kernel integrity critical data Mimi Zohar
2021-01-15 17:26 ` Tushar Sugandhi
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