From: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>,
linux-security-module@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org,
linux-ima-devel@lists.sourceforge.net,
Dave Young <dyoung@redhat.com>
Subject: Re: [PATCH 1/7] ima: on soft reboot, restore the measurement list
Date: Wed, 10 Aug 2016 02:05:53 -0300 [thread overview]
Message-ID: <18857164.IzlezsQllh@hactar> (raw)
In-Reply-To: <87r39xthnv.fsf@concordia.ellerman.id.au>
Am Mittwoch, 10 August 2016, 13:41:08 schrieb Michael Ellerman:
> Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> writes:
> > Am Dienstag, 09 August 2016, 09:01:13 schrieb Mimi Zohar:
> >> On Tue, 2016-08-09 at 20:59 +1000, Michael Ellerman wrote:
> >> > Mimi Zohar <zohar@linux.vnet.ibm.com> writes:
> >> > > +/* Some details preceding the binary serialized measurement list
> >> > > */
> >> > > +struct ima_kexec_hdr {
> >> > > + unsigned short version;
> >> > > + unsigned long buffer_size;
> >> > > + unsigned long count;
> >> > > +} __packed;
> >> > > +
> >> >
> >> > Am I understanding it correctly that this structure is passed between
> >> > kernels?
> >>
> >> Yes, the header prefixes the measurement list, which is being passed on
> >> the same computer to the next kernel. Could the architecture (eg.
> >> LE/BE) change between soft re-boots?
> >
> > Yes. I am able to boot a BE kernel from an LE kernel with my patches.
> > Whether we want to support that or not is another question...
>
> Yes you must support that. BE -> LE and vice versa.
I didn't test BE - LE yet, but will do.
> You should also consider the possibility that the next kernel is not
> Linux.
If the next kernel is an ELF binary and it supports the kexec "calling
convention", it should work too. What could possibly go wrong? I can try
FreeBSD (I suppose it's an ELF kernel) and see what happens.
--
[]'s
Thiago Jung Bauermann
IBM Linux Technology Center
next prev parent reply other threads:[~2016-08-10 5:06 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-04 12:24 [PATCH 0/7] ima: carry the measurement list across kexec Mimi Zohar
2016-08-04 12:24 ` [PATCH 1/7] ima: on soft reboot, restore the measurement list Mimi Zohar
2016-08-05 8:44 ` Petko Manolov
2016-08-05 13:34 ` Mimi Zohar
2016-08-05 15:56 ` Petko Manolov
2016-08-09 10:59 ` Michael Ellerman
2016-08-09 13:01 ` Mimi Zohar
2016-08-09 13:19 ` Thiago Jung Bauermann
2016-08-09 13:35 ` David Laight
2016-08-09 14:02 ` Mimi Zohar
2016-08-09 13:55 ` Mimi Zohar
2016-08-09 14:06 ` Mimi Zohar
2016-08-09 23:13 ` Samuel Mendoza-Jonas
2016-08-10 3:41 ` Michael Ellerman
2016-08-10 5:05 ` Thiago Jung Bauermann [this message]
2016-08-10 9:52 ` Michael Ellerman
2016-08-10 12:54 ` Mimi Zohar
2016-08-10 14:32 ` [Linux-ima-devel] " Petko Manolov
2016-08-10 14:40 ` David Laight
2016-08-10 15:48 ` Petko Manolov
2016-08-04 12:24 ` [PATCH 2/7] ima: permit duplicate measurement list entries Mimi Zohar
2016-08-04 12:24 ` [PATCH 3/7] ima: maintain memory size needed for serializing the measurement list Mimi Zohar
2016-08-04 12:24 ` [PATCH 4/7] ima: serialize the binary_runtime_measurements Mimi Zohar
2016-08-04 12:24 ` [PATCH 5/7] ima: on soft reboot, save the measurement list Mimi Zohar
2016-08-04 12:24 ` [PATCH 6/7] ima: store the builtin/custom template definitions in a list Mimi Zohar
2016-08-04 12:24 ` [PATCH 7/7] ima: support restoring multiple template formats Mimi Zohar
2016-08-09 5:19 ` [PATCH 0/7] ima: carry the measurement list across kexec Balbir Singh
2016-08-09 12:36 ` Mimi Zohar
2016-08-11 7:38 ` Balbir Singh
2016-08-11 11:25 ` Mimi Zohar
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