linux-kernel - Re: [PATCH v16 0/7] Parse ACPI table and limit KASLR to choosing immovable memory

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Message-ID: <20190128175132.GE20487@zn.tnic>
Date:   Mon, 28 Jan 2019 18:51:32 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Chao Fan <fanc.fnst@...fujitsu.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com, keescook@...omium.org,
        bhe@...hat.com, msys.mizuma@...il.com, indou.takao@...fujitsu.com,
        caoj.fnst@...fujitsu.com, kasong@...hat.com
Subject: Re: [PATCH v16 0/7] Parse ACPI table and limit KASLR to choosing
 immovable memory

On Wed, Jan 23, 2019 at 07:08:43PM +0800, Chao Fan wrote:
> PATCH 1/7 Copy kstrtoull() to boot/string.c to instead of using
>           old simple_strtoull()
> PATCH 2/7 Introduce get_acpi_rsdp() to parse RSDP in cmdline from KEXEC
> PATCH 3/6 Introduce efi_get_rsdp_addr() to find RSDP from EFI table when
>           booting from EFI.
> PATCH 4/7 Introduce bios_get_rsdp_addr() to search RSDP in memory when
>           booting from BIOS
> PATCH 5/7 Parse RSDP and fill in boot_params->acpi_rsdp_addr before
>           KASLR.
> PATCH 6/7 Compute SRAT from RSDP and walk SRAT to store the immovable
>           memory regions and store the immovable memory regions.
> PATCH 7/7 Calculate the intersection between memory regions from e820/efi
>           memory table and immovable memory regions. Limit KASLR to
>           choosing these regions for randomization.

Ok, I've massaged the whole pile and fixed a couple of things that
sprang at me, see each commit message for details.

Please run it and check whether I haven't broken anything:

https://git.kernel.org/pub/scm/linux/kernel/git/bp/bp.git/log/?h=tip-x86-boot

Thx.

-- 
Regards/Gruss,
    Boris.

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