From: Mimi Zohar <zohar@linux.ibm.com>
To: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>,
Nayna Jain <nayna@linux.vnet.ibm.com>,
Nayna Jain <nayna@linux.ibm.com>,
linuxppc-dev@ozlabs.org, linux-efi@vger.kernel.org,
linux-integrity@vger.kernel.org
Cc: linux-kernel@vger.kernel.org,
Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Jeremy Kerr <jk@ozlabs.org>,
Matthew Garret <matthew.garret@nebula.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Claudio Carvalho <cclaudio@linux.ibm.com>,
George Wilson <gcwilson@linux.ibm.com>,
Elaine Palmer <erpalmer@us.ibm.com>,
Eric Ricther <erichte@linux.ibm.com>,
"Oliver O'Halloran" <oohall@gmail.com>,
Prakhar Srivastava <prsriva02@gmail.com>
Subject: Re: [PATCH v9 5/8] ima: make process_buffer_measurement() generic
Date: Sat, 26 Oct 2019 20:13:22 -0400 [thread overview]
Message-ID: <1572135202.4532.88.camel@linux.ibm.com> (raw)
In-Reply-To: <8a97301a-0e25-2718-bd81-d778cb58e1d3@linux.microsoft.com>
On Fri, 2019-10-25 at 10:32 -0700, Lakshmi Ramasubramanian wrote:
>
> On 10/25/2019 10:24 AM, Nayna Jain wrote:
> >
> > On 10/24/19 10:20 AM, Lakshmi Ramasubramanian wrote:
> >> On 10/23/19 8:47 PM, Nayna Jain wrote:
> >>
> >> Hi Nayna,
> >>
> >>> +void process_buffer_measurement(const void *buf, int size,
> >>> + const char *eventname, enum ima_hooks func,
> >>> + int pcr)
> >>> {
> >>> int ret = 0;
> >>> struct ima_template_entry *entry = NULL;
> >>
> >>> + if (func) {
Let's comment this line. Perhaps something like /*Unnecessary for
auxiliary buffer measurements */
> >>> + security_task_getsecid(current, &secid);
> >>> + action = ima_get_action(NULL, current_cred(), secid, 0, func,
> >>> + &pcr, &template);
> >>> + if (!(action & IMA_MEASURE))
> >>> + return;
> >>> + }
> >>
> >> In your change set process_buffer_measurement is called with NONE for
> >> the parameter func. So ima_get_action (the above if block) will not be
> >> executed.
> >>
> >> Wouldn't it better to update ima_get_action (and related functions) to
> >> handle the ima policy (func param)?
> >
> >
> > The idea is to use ima-buf template for the auxiliary measurement
> > record. The auxiliary measurement record is an additional record to the
> > one already created based on the existing policy. When func is passed as
> > NONE, it represents it is an additional record. I am not sure what you
> > mean by updating ima_get_action, it is already handling the ima policy.
> >
>
> I was referring to using "func" in process_buffer_measurement to
> determine ima action. In my opinion, process_buffer_measurement should
> be generic.
>
> ima_get_action() should instead determine the required ima action,
> template, pcr, etc. based on "func" passed to it.
Nayna's original patch moved ima_get_action() into the caller, but
that resulted in code duplication in each of the callers. This
solution differentiates between the initial, which requires calling
ima_get_action(), and auxiliary buffer measurement records.
Mimi
next prev parent reply other threads:[~2019-10-27 0:13 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-24 3:47 [PATCH v9 0/8] powerpc: Enabling IMA arch specific secure boot policies Nayna Jain
2019-10-24 3:47 ` [PATCH v9 1/8] powerpc: detect the secure boot mode of the system Nayna Jain
2019-10-24 17:26 ` Lakshmi Ramasubramanian
2019-10-25 16:49 ` Nayna Jain
2019-10-24 3:47 ` [PATCH v9 2/8] powerpc/ima: add support to initialize ima policy rules Nayna Jain
2019-10-24 17:35 ` Lakshmi Ramasubramanian
2019-10-25 17:02 ` Nayna Jain
2019-10-25 18:03 ` Lakshmi Ramasubramanian
2019-10-28 23:42 ` Michael Ellerman
2019-10-26 23:52 ` Mimi Zohar
2019-10-28 11:54 ` Mimi Zohar
2019-10-24 3:47 ` [PATCH v9 3/8] powerpc: detect the trusted boot state of the system Nayna Jain
2019-10-24 17:38 ` Lakshmi Ramasubramanian
2019-10-25 16:50 ` Nayna Jain
2019-10-24 3:47 ` [PATCH v9 4/8] powerpc/ima: define trusted boot policy Nayna Jain
2019-10-24 17:40 ` Lakshmi Ramasubramanian
2019-10-24 3:47 ` [PATCH v9 5/8] ima: make process_buffer_measurement() generic Nayna Jain
2019-10-24 15:20 ` Lakshmi Ramasubramanian
2019-10-25 17:24 ` Nayna Jain
2019-10-25 17:32 ` Lakshmi Ramasubramanian
2019-10-27 0:13 ` Mimi Zohar [this message]
2019-10-30 15:22 ` Lakshmi Ramasubramanian
2019-10-30 16:35 ` Mimi Zohar
2019-10-24 3:47 ` [PATCH v9 6/8] certs: add wrapper function to check blacklisted binary hash Nayna Jain
2019-10-24 3:47 ` [PATCH v9 7/8] ima: check against blacklisted hashes for files with modsig Nayna Jain
2019-10-24 17:48 ` Lakshmi Ramasubramanian
2019-10-25 17:36 ` Nayna Jain
2019-10-24 3:47 ` [PATCH v9 8/8] powerpc/ima: update ima arch policy to check for blacklist Nayna Jain
2019-10-28 12:10 ` [PATCH v9 0/8] powerpc: Enabling IMA arch specific secure boot policies Mimi Zohar
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