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RE: [PATCH 1/7] ima: on soft reboot, restore the measurement list

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From: Thiago Jung Bauermann
> Sent: 09 August 2016 14:19
...
> > > > +/* 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.

64bit kernel to/from 32bit one? (if that makes sense on the hardware).

> Whether we want to support that or not is another question...

In which case shouldn't they be annotated with the endianness??

Also why '__packed' - guarantees sub-optimal code generation.
Much better to include explicit padding to align everything.

	David

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[PATCH 1/7] ima: on soft reboot, restore the measurement list Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-08-04 15:50 +0200
  Re: [PATCH 1/7] ima: on soft reboot, restore the measurement list Petko Manolov <petkan@mip-labs.com> - 2016-08-05 11:30 +0200
    Re: [PATCH 1/7] ima: on soft reboot, restore the measurement list Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-08-05 15:40 +0200
      Re: [PATCH 1/7] ima: on soft reboot, restore the measurement list Petko Manolov <petkan@mip-labs.com> - 2016-08-05 18:00 +0200
  Re: [PATCH 1/7] ima: on soft reboot, restore the measurement list Michael Ellerman <mpe@ellerman.id.au> - 2016-08-09 13:10 +0200
    Re: [PATCH 1/7] ima: on soft reboot, restore the measurement list Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-08-09 15:10 +0200
      Re: [PATCH 1/7] ima: on soft reboot, restore the measurement list Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-08-09 15:20 +0200
        RE: [PATCH 1/7] ima: on soft reboot, restore the measurement list David Laight <David.Laight@ACULAB.COM> - 2016-08-09 15:40 +0200
          Re: [PATCH 1/7] ima: on soft reboot, restore the measurement list Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-08-09 16:10 +0200
        Re: [PATCH 1/7] ima: on soft reboot, restore the measurement list Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-08-09 16:00 +0200
          Re: [PATCH 1/7] ima: on soft reboot, restore the measurement list Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-08-09 16:10 +0200
        Re: [PATCH 1/7] ima: on soft reboot, restore the measurement list Samuel Mendoza-Jonas <sam@mendozajonas.com> - 2016-08-10 01:30 +0200
        Re: [PATCH 1/7] ima: on soft reboot, restore the measurement list Michael Ellerman <mpe@ellerman.id.au> - 2016-08-10 05:50 +0200
          Re: [PATCH 1/7] ima: on soft reboot, restore the measurement list Michael Ellerman <mpe@ellerman.id.au> - 2016-08-10 20:10 +0200
            Re: [Linux-ima-devel] [PATCH 1/7] ima: on soft reboot, restore the  measurement list Petko Manolov <petkan@mip-labs.com> - 2016-08-10 20:30 +0200
              Re: [Linux-ima-devel] [PATCH 1/7] ima: on soft reboot, restore the  measurement list Petko Manolov <petkan@mip-labs.com> - 2016-08-10 22:20 +0200
              RE: [Linux-ima-devel] [PATCH 1/7] ima: on soft reboot, restore the  measurement list David Laight <David.Laight@ACULAB.COM> - 2016-08-10 23:20 +0200
            Re: [PATCH 1/7] ima: on soft reboot, restore the measurement list Mimi Zohar <zohar@linux.vnet.ibm.com> - 2016-08-10 20:50 +0200
          Re: [PATCH 1/7] ima: on soft reboot, restore the measurement list Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> - 2016-08-10 20:10 +0200

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