From: Mimi Zohar <zohar@linux.vnet.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-security-module <linux-security-module@vger.kernel.org>,
linux-ima-devel@lists.sourceforge.net,
Dave Young <dyoung@redhat.com>,
kexec@lists.infradead.org, linuxppc-dev@lists.ozlabs.org,
linux-kernel@vger.kernel.org,
Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Subject: Re: [PATHC v2 0/9] ima: carry the measurement list across kexec
Date: Wed, 31 Aug 2016 18:38:06 -0400 [thread overview]
Message-ID: <1472683086.2607.17.camel@linux.vnet.ibm.com> (raw)
In-Reply-To: <20160831135047.4b05a7f912f158ed5f888241@linux-foundation.org>
On Wed, 2016-08-31 at 13:50 -0700, Andrew Morton wrote:
> On Tue, 30 Aug 2016 18:40:02 -0400 Mimi Zohar <zohar@linux.vnet.ibm.com> wrote:
>
> > The TPM PCRs are only reset on a hard reboot. In order to validate a
> > TPM's quote after a soft reboot (eg. kexec -e), the IMA measurement list
> > of the running kernel must be saved and then restored on the subsequent
> > boot, possibly of a different architecture.
> >
> > The existing securityfs binary_runtime_measurements file conveniently
> > provides a serialized format of the IMA measurement list. This patch
> > set serializes the measurement list in this format and restores it.
> >
> > Up to now, the binary_runtime_measurements was defined as architecture
> > native format. The assumption being that userspace could and would
> > handle any architecture conversions. With the ability of carrying the
> > measurement list across kexec, possibly from one architecture to a
> > different one, the per boot architecture information is lost and with it
> > the ability of recalculating the template digest hash. To resolve this
> > problem, without breaking the existing ABI, this patch set introduces
> > the boot command line option "ima_canonical_fmt", which is arbitrarily
> > defined as little endian.
> >
> > The need for this boot command line option will be limited to the
> > existing version 1 format of the binary_runtime_measurements.
> > Subsequent formats will be defined as canonical format (eg. TPM 2.0
> > support for larger digests).
> >
> > This patch set pre-req's Thiago Bauermann's "kexec_file: Add buffer
> > hand-over for the next kernel" patch set.
> >
> > These patches can also be found in the next-kexec-restore branch of:
> > git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git
>
> I'll merge these into -mm to get some linux-next exposure. I don't
> know what your upstream merge plans will be?
Sounds good. I'm hoping to get some review/comments on this patch set
as well. At the moment, I'm chasing down a kernel test robot report
from this afternoon.
Mimi
WARNING: multiple messages have this Message-ID (diff)
From: Mimi Zohar <zohar@linux.vnet.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linuxppc-dev@lists.ozlabs.org, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org,
Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>,
linux-security-module <linux-security-module@vger.kernel.org>,
linux-ima-devel@lists.sourceforge.net,
Dave Young <dyoung@redhat.com>
Subject: Re: [PATHC v2 0/9] ima: carry the measurement list across kexec
Date: Wed, 31 Aug 2016 18:38:06 -0400 [thread overview]
Message-ID: <1472683086.2607.17.camel@linux.vnet.ibm.com> (raw)
In-Reply-To: <20160831135047.4b05a7f912f158ed5f888241@linux-foundation.org>
On Wed, 2016-08-31 at 13:50 -0700, Andrew Morton wrote:
> On Tue, 30 Aug 2016 18:40:02 -0400 Mimi Zohar <zohar@linux.vnet.ibm.com> wrote:
>
> > The TPM PCRs are only reset on a hard reboot. In order to validate a
> > TPM's quote after a soft reboot (eg. kexec -e), the IMA measurement list
> > of the running kernel must be saved and then restored on the subsequent
> > boot, possibly of a different architecture.
> >
> > The existing securityfs binary_runtime_measurements file conveniently
> > provides a serialized format of the IMA measurement list. This patch
> > set serializes the measurement list in this format and restores it.
> >
> > Up to now, the binary_runtime_measurements was defined as architecture
> > native format. The assumption being that userspace could and would
> > handle any architecture conversions. With the ability of carrying the
> > measurement list across kexec, possibly from one architecture to a
> > different one, the per boot architecture information is lost and with it
> > the ability of recalculating the template digest hash. To resolve this
> > problem, without breaking the existing ABI, this patch set introduces
> > the boot command line option "ima_canonical_fmt", which is arbitrarily
> > defined as little endian.
> >
> > The need for this boot command line option will be limited to the
> > existing version 1 format of the binary_runtime_measurements.
> > Subsequent formats will be defined as canonical format (eg. TPM 2.0
> > support for larger digests).
> >
> > This patch set pre-req's Thiago Bauermann's "kexec_file: Add buffer
> > hand-over for the next kernel" patch set.
> >
> > These patches can also be found in the next-kexec-restore branch of:
> > git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git
>
> I'll merge these into -mm to get some linux-next exposure. I don't
> know what your upstream merge plans will be?
Sounds good. I'm hoping to get some review/comments on this patch set
as well. At the moment, I'm chasing down a kernel test robot report
from this afternoon.
Mimi
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next prev parent reply other threads:[~2016-08-31 22:58 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-30 22:40 [PATHC v2 0/9] ima: carry the measurement list across kexec Mimi Zohar
2016-08-30 22:40 ` Mimi Zohar
2016-08-30 22:40 ` [PATHC v2 1/9] ima: on soft reboot, restore the measurement list Mimi Zohar
2016-08-30 22:40 ` Mimi Zohar
2016-08-30 22:40 ` [PATHC v2 2/9] ima: permit duplicate measurement list entries Mimi Zohar
2016-08-30 22:40 ` Mimi Zohar
2016-08-30 22:40 ` [PATHC v2 3/9] ima: maintain memory size needed for serializing the measurement list Mimi Zohar
2016-08-30 22:40 ` Mimi Zohar
2016-08-30 22:40 ` [PATHC v2 4/9] ima: serialize the binary_runtime_measurements Mimi Zohar
2016-08-30 22:40 ` Mimi Zohar
2016-08-30 22:40 ` [PATHC v2 5/9] ima: on soft reboot, save the measurement list Mimi Zohar
2016-08-30 22:40 ` Mimi Zohar
2016-09-01 1:57 ` Dave Young
2016-09-01 1:57 ` Dave Young
2016-09-02 13:22 ` Mimi Zohar
2016-09-02 13:22 ` Mimi Zohar
2016-08-30 22:40 ` [PATHC v2 6/9] ima: store the builtin/custom template definitions in a list Mimi Zohar
2016-08-30 22:40 ` Mimi Zohar
2016-08-30 22:40 ` [PATHC v2 7/9] ima: support restoring multiple template formats Mimi Zohar
2016-08-30 22:40 ` Mimi Zohar
2016-08-30 22:40 ` [PATHC v2 8/9] ima: define a canonical binary_runtime_measurements list format Mimi Zohar
2016-08-30 22:40 ` Mimi Zohar
2016-08-30 22:40 ` [PATHC v2 9/9] ima: platform-independent hash value Mimi Zohar
2016-08-30 22:40 ` Mimi Zohar
2016-08-31 20:50 ` [PATHC v2 0/9] ima: carry the measurement list across kexec Andrew Morton
2016-08-31 20:50 ` Andrew Morton
2016-08-31 22:38 ` Mimi Zohar [this message]
2016-08-31 22:38 ` Mimi Zohar
2016-09-15 15:44 ` Mimi Zohar
2016-09-15 15:44 ` Mimi Zohar
2016-09-16 19:47 ` Eric W. Biederman
2016-09-16 19:47 ` Eric W. Biederman
2016-09-16 21:03 ` Eric W. Biederman
2016-09-16 21:03 ` Eric W. Biederman
2016-09-16 23:32 ` Thiago Jung Bauermann
2016-09-16 23:32 ` Thiago Jung Bauermann
2016-09-17 5:17 ` Eric W. Biederman
2016-09-17 5:17 ` Eric W. Biederman
2016-09-18 21:25 ` Thiago Jung Bauermann
2016-09-18 21:25 ` Thiago Jung Bauermann
2016-09-20 16:07 ` Eric W. Biederman
2016-09-20 16:07 ` Eric W. Biederman
2016-09-26 18:31 ` Thiago Jung Bauermann
2016-09-26 18:31 ` Thiago Jung Bauermann
2016-09-29 21:43 ` Eric W. Biederman
2016-09-29 21:43 ` Eric W. Biederman
2016-09-29 22:21 ` Thiago Jung Bauermann
2016-09-29 22:21 ` Thiago Jung Bauermann
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