Re: [PATCH 3/3] x86: kernel base offset ASLR

[Yinghai Lu]

On Thu, Apr 4, 2013 at 1:21 PM, H. Peter Anvin <hpa@xxxxxxxxx> wrote:
> I have to admit to being somewhat skeptical toward KASLR with only 8
> bits of randomness.  There are at least two potential ways of
> dramatically increasing the available randomness:
>
> 1. actually compose the kernel of multiple independently relocatable
>    pieces (maybe chunk it on 2M boundaries or something.)
>
> 2. compile the kernel as one of the memory models which can be executed
>    anywhere in the 64-bit address space.  The cost of this would have
>    to be quantified, of course.

Why just let bootloader to load kernel on random address instead?

For our 64bit bzImage, boot loader could load kernel to anywhere above 4G.

Thanks

Yinghai
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