Re: [RFC][PATCH] Randomize kernel base address on boot

Rafael J. Wysocki
2011-05-27T16:07:04Z

On Friday, May 27, 2011, H. Peter Anvin wrote:
> On 05/26/2011 03:18 PM, Rafael J. Wysocki wrote:
> >
> > Well, as far as I can tell, this feature is going to break hibernation on
> > both x86_32 and x86_64 at the moment, unless you can guarantee that the
> > randomized kernel location will be the same for both the boot and the target
> > kernels.
> >
>
> Obviously we can't and we don't. I'm a bit surprised at that
> constraint... how can that constraint not break things like kernels of
> slightly different size?

Our hibernation code generally requires that the kernel used for loading
the image be the same as the hibernated one. This requirement is slightly
lifted for x86_64, but still we don't have a mechanism for passing the
jump address into the hibernated header in the image header.

I planned to add that, but then didn't have the time to work on it.

Thanks,
Rafael