From: Paul Moore <paul@paul-moore.com>
To: Mimi Zohar <zohar@linux.ibm.com>
Cc: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>,
Sasha Levin <sashal@kernel.org>,
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 11:51:02 -0500 [thread overview]
Message-ID: <CAHC9VhTrxCi=H0ezR6eXjXnHH+atU9ieSZWy6pybOE9eAKnrMQ@mail.gmail.com> (raw)
In-Reply-To: <99be76345f375bb2f485f08a53dcb8ed806dc538.camel@linux.ibm.com>
On Thu, Jan 14, 2021 at 11:44 AM Mimi Zohar <zohar@linux.ibm.com> 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.
I'm not a fan of merging things which are known to be broken only with
the promise of fixing it later. That goes double when the proper fix
will result in a user visible breaking change.
--
paul moore
www.paul-moore.com
next prev parent reply other threads:[~2021-01-14 16:52 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
2021-01-14 19:21 ` Lakshmi Ramasubramanian
2021-01-14 16:51 ` Paul Moore [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAHC9VhTrxCi=H0ezR6eXjXnHH+atU9ieSZWy6pybOE9eAKnrMQ@mail.gmail.com' \
--to=paul@paul-moore.com \
--cc=agk@redhat.com \
--cc=casey@schaufler-ca.com \
--cc=dm-devel@redhat.com \
--cc=gmazyland@gmail.com \
--cc=jmorris@namei.org \
--cc=linux-integrity@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-security-module@vger.kernel.org \
--cc=nramas@linux.microsoft.com \
--cc=sashal@kernel.org \
--cc=selinux@vger.kernel.org \
--cc=snitzer@redhat.com \
--cc=stephen.smalley.work@gmail.com \
--cc=tusharsu@linux.microsoft.com \
--cc=tyhicks@linux.microsoft.com \
--cc=zohar@linux.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).