Re: [PATCH v8 0/3] x86/boot/KASLR: Parse ACPI table and limit kaslr in immovable memory

Masayoshi Mizuma
2018-10-15T00:50:35Z

On Sun, Oct 14, 2018 at 12:05:41AM +0200, Borislav Petkov wrote:
> On Sat, Oct 13, 2018 at 05:45:51PM -0400, Masayoshi Mizuma wrote:
> > Yes, but I think we need to arrange the Chao's SRAT parsing to be used
> > from kernel_randomize_memory() because Chao's approach needs the SRAT
> > parsing before extract kernel and the padding size calculation needs
> > the parsing in start_kernel(), so they are living in different life
> > cycle and space.
>
> Or you would like to pass some info from the compressed kernel to kernel
> proper?
>
> For example, something like the passing in add_e820ext() and the consumtion
> in parse_setup_data():
>
> switch (data_type) {
> case SETUP_E820_EXT:
> e820__memory_setup_extended(pa_data, data_len);
>
> So info you need for your padding gets collected in
> arch/x86/boot/compressed/acpitb.c and you consume it in
> kernel_randomize_memory()?
>
> Would that work?

It's nice idea! Thank you so much!

- Masa