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

Borislav Petkov
2018-10-10T17:16:16Z

On Wed, Oct 10, 2018 at 04:41:16PM +0800, Chao Fan wrote:
> In the earliest time, I tried to dig ACPI tabls to solve this problem.
> But I didn't splite the code in 'compressed/' and ACPI code, so the patch
> is hard to follow so refused by community.
> Somebody suggest to add a kernel parameter to specify the
> immovable memory so that limit kaslr in these regions. Then I make
> a new patchset. After several versions, Ingo gave a suggestion:
> https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1634024.html
> Follow Ingo's suggestion, imitate the ACPI code to parse the acpi
> tables, so that the kaslr can get necessary memory information in
> ACPI tables.
> I think ACPI code is an independent part, so copy the codes
> and functions to 'compressed/' directory, so that kaslr won't
> influence the initialization of ACPI.

You say "copy". I'm still about to look at the code but can those
functions be carved out in a separate compilation unit which ACPI *and*
KASLR can both link with so that there's no duplication?

--
Regards/Gruss,
Boris.

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