Re: [PATCH v2] x86, kaslr: propagate base load address calculation

Borislav Petkov
2015-02-16T11:56:05Z

On Fri, Feb 13, 2015 at 03:25:26PM -0800, Kees Cook wrote:
> No, no; I agree: a malicious boot loader is a lost cause. I mean
> mostly from a misbehavior perspective. Like, someone sees "kaslr" in
> the setup args and thinks they can set it to 1 and boot a kernel, etc.
> Or they set it to 0, but they lack HIBERNATION and "1" gets appended,
> but the setup_data parser sees the boot-loader one set to 0, etc. I'm
> just curious if we should avoid getting some poor system into a
> confusing state.

Well, we can apply the rule of the last setting sticks and since the
kernel is always going to be adding the last setup_data element of
type SETUP_KASLR (the boot loader ones will be somewhere on the list
in-between and we add to the end), we're fine, no?

--
Regards/Gruss,
Boris.

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