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From: Mimi Zohar <zohar@linux.ibm.com>
To: Tushar Sugandhi <tusharsu@linux.microsoft.com>,
	stephen.smalley.work@gmail.com, casey@schaufler-ca.com,
	agk@redhat.com, snitzer@redhat.com, gmazyland@gmail.com,
	paul@paul-moore.com
Cc: tyhicks@linux.microsoft.com, sashal@kernel.org,
	jmorris@namei.org, nramas@linux.microsoft.com,
	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 v9 5/8] IMA: limit critical data measurement based on a label
Date: Thu, 24 Dec 2020 09:29:50 -0500	[thread overview]
Message-ID: <56db41c08d625b8143454a2e0aaaef3ea2927442.camel@linux.ibm.com> (raw)
In-Reply-To: <20201212180251.9943-6-tusharsu@linux.microsoft.com>

Hi Tushar,

On Sat, 2020-12-12 at 10:02 -0800, Tushar Sugandhi wrote:
> System administrators should be able to limit which kernel subsystems
> they want to measure the critical data for. To enable that, an IMA policy
> condition to choose specific kernel subsystems is needed. This policy
> condition would constrain the measurement of the critical data based on
> a label for the given subsystems.

Restricting which kernel integrity critical data is measured is not
only of interest to system administrators.   Why single them out?

Limiting which critical data is measured is based on a label, making it
flexible.  In your use case scenario, you're grouping the label based
on kernel subsystem, but is that really necessary?  In the broader
picture, there could be cross subsystem critical data being measured
based on a single label.

Please think about the broader picture and re-write the patch
descirption more generically.

> 
> Add a new IMA policy condition - "data_source:=" to the IMA func

What is with "add"?  You're "adding support for" or "defining" a new
policy condition.  Remove the single hyphen, as explained in 3/8.

Please replace "data_source" with something more generic (e.g. label).

thanks,

Mimi

> CRITICAL_DATA to allow measurement of various kernel subsystems. This
> policy condition would enable the system administrators to restrict the
> measurement to the labels listed in "data_source:=".
> 
> Limit the measurement to the labels that are specified in the IMA
> policy - CRITICAL_DATA+"data_source:=". If "data_sources:=" is not
> provided with the func CRITICAL_DATA, the data from all the
> supported kernel subsystems is measured.
> 
> Signed-off-by: Tushar Sugandhi <tusharsu@linux.microsoft.com>


  parent reply	other threads:[~2020-12-24 14:30 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-12 18:02 [PATCH v9 0/8] IMA: support for measuring kernel integrity critical data Tushar Sugandhi
2020-12-12 18:02 ` [PATCH v9 1/8] IMA: generalize keyring specific measurement constructs Tushar Sugandhi
2020-12-24 13:06   ` Mimi Zohar
2021-01-05 18:48     ` Tushar Sugandhi
2020-12-12 18:02 ` [PATCH v9 2/8] IMA: add support to measure buffer data hash Tushar Sugandhi
2020-12-24  0:03   ` Mimi Zohar
2021-01-05 18:53     ` Tushar Sugandhi
2021-01-06  5:00       ` Tushar Sugandhi
2020-12-12 18:02 ` [PATCH v9 3/8] IMA: define a hook to measure kernel integrity critical data Tushar Sugandhi
2020-12-24 13:04   ` Mimi Zohar
2021-01-05 20:01     ` Tushar Sugandhi
2021-01-05 20:16       ` Mimi Zohar
2021-01-05 20:19         ` Tushar Sugandhi
2020-12-12 18:02 ` [PATCH v9 4/8] IMA: add policy rule to measure " Tushar Sugandhi
2020-12-12 19:20   ` Tyler Hicks
2020-12-13  1:21     ` Tushar Sugandhi
2020-12-24 13:48   ` Mimi Zohar
2021-01-05 20:12     ` Tushar Sugandhi
2020-12-12 18:02 ` [PATCH v9 5/8] IMA: limit critical data measurement based on a label Tushar Sugandhi
2020-12-12 19:20   ` Tyler Hicks
2020-12-13  1:21     ` Tushar Sugandhi
2020-12-24 14:29   ` Mimi Zohar [this message]
2021-01-05 20:28     ` Tushar Sugandhi
2020-12-12 18:02 ` [PATCH v9 6/8] IMA: extend critical data hook to limit the " Tushar Sugandhi
2020-12-12 18:02 ` [PATCH v9 7/8] IMA: define a builtin critical data measurement policy Tushar Sugandhi
2020-12-24 14:41   ` Mimi Zohar
2021-01-05 20:30     ` Tushar Sugandhi
2020-12-12 18:02 ` [PATCH v9 8/8] selinux: include a consumer of the new IMA critical data hook Tushar Sugandhi
2020-12-23 21:10   ` Paul Moore
2021-01-04 23:30     ` Lakshmi Ramasubramanian
2021-01-05  2:13       ` Paul Moore
2021-01-05  5:24         ` Lakshmi Ramasubramanian

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