From: Mimi Zohar <zohar@linux.ibm.com>
To: Janne Karhunen <janne.karhunen@gmail.com>,
linux-integrity@vger.kernel.org,
linux-security-module <linux-security-module@vger.kernel.org>
Cc: Ken Goldman <kgold@linux.ibm.com>,
david.safford@gmail.com, monty.wiseman@ge.com
Subject: Re: [PATCH v2] ima: export the measurement list when needed
Date: Wed, 22 Jan 2020 10:56:19 -0500 [thread overview]
Message-ID: <1579708579.5182.77.camel@linux.ibm.com> (raw)
In-Reply-To: <CAE=NcrZrbRinOAbB+k1rjhcae3nqfJ8snC_EnY8njMDioM7=vg@mail.gmail.com>
Hi Janne,
On Fri, 2020-01-10 at 10:48 +0200, Janne Karhunen wrote:
> On Wed, Jan 8, 2020 at 1:18 PM Janne Karhunen <janne.karhunen@gmail.com> wrote:
> >
> > Some systems can end up carrying lots of entries in the ima
> > measurement list. Since every entry is using a bit of kernel
> > memory, allow the sysadmin to export the measurement list to
> > the filesystem to free up some memory.
>
> Hopefully this addressed comments from everyone. The flush event can
> now be triggered by the admin anytime and unique file names can be
> used for each flush (log.1, log.2, ...) etc, so getting to the correct
> item should be easy.
>
> While it can now be argued that since this is an admin-driven event,
> kernel does not need to write the file. However, the intention is to
> bring out a second patch a bit later that adds a variable to define
> the max number of entries to be kept in the kernel memory and
> workqueue based automatic flushing. In those cases the kernel has to
> be able to write the file without any help from the admin..
I don't think it is common, and probably not acceptable, for the
kernel to open a file for writing.
As exporting the binary measurement list should be the equivalent of
displaying the binary measurement list and redirecting the output to a
file, the same mechanism used for displaying the binary measurement
list should be re-used for exporting it. Just as carrying the
measurement list across kexec re-uses the same method.
Mimi
next prev parent reply other threads:[~2020-01-22 15:56 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-08 11:17 [PATCH v2] ima: export the measurement list when needed Janne Karhunen
2020-01-10 8:48 ` Janne Karhunen
2020-01-22 15:56 ` Mimi Zohar [this message]
2020-01-23 8:41 ` Janne Karhunen
2020-01-26 17:01 ` Mimi Zohar
2020-01-27 9:03 ` Janne Karhunen
2020-02-06 14:13 ` Mimi Zohar
2020-02-10 8:04 ` Janne Karhunen
2020-02-10 15:26 ` Mimi Zohar
2020-02-10 18:18 ` david.safford
2020-02-10 20:24 ` Mimi Zohar
2020-02-11 8:06 ` Janne Karhunen
2020-02-11 16:10 ` david.safford
2020-02-11 23:10 ` Mimi Zohar
2020-02-12 21:08 ` david.safford
2020-02-13 1:03 ` Mimi Zohar
2020-02-13 6:41 ` Janne Karhunen
2020-02-18 15:36 ` Mimi Zohar
2020-02-13 20:11 ` Ken Goldman
2020-02-18 14:50 ` david.safford
2020-01-24 14:46 ` david.safford
2020-01-27 8:48 ` Janne Karhunen
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=1579708579.5182.77.camel@linux.ibm.com \
--to=zohar@linux.ibm.com \
--cc=david.safford@gmail.com \
--cc=janne.karhunen@gmail.com \
--cc=kgold@linux.ibm.com \
--cc=linux-integrity@vger.kernel.org \
--cc=linux-security-module@vger.kernel.org \
--cc=monty.wiseman@ge.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).