Re: [PATCH v3 5/7] x86, kaslr: Consolidate mem_avoid array filling

From: Kees Cook
Date: Mon Mar 09 2015 - 21:26:20 EST

On Mon, Mar 9, 2015 at 6:10 PM, Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
> On Mon, Mar 9, 2015 at 6:00 PM, Kees Cook <keescook@xxxxxxxxxxxx> wrote:
>> On Sat, Mar 7, 2015 at 2:07 PM, Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
>> This may be a stupid question, but are boot_params being used outside
>> of the compressed loader? If so, it might make sense to split that
>> change into a separate patch to go to stable, if it's causing
>> problems. (And document what problem is getting solved.)
> boot_params will keep the same and until it is passed
> x86_64_start_kernel in vmlinux.
> and there it will be copied, same as cmdline.
> but current kaslr only support random the base high, and it does not
> support kexec
> and current boot loader (grub2) put it really low. (under 1M). the
> real real_mode. :).

Oh right! Of course, thanks for the details. Yes, it was implicitly
ignored before, but now it needs to be explicitly ignored. Great,


> Thanks
> Yinghai

Kees Cook
Chrome OS Security
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