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

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Date:   Wed, 30 Jan 2019 13:58:47 +0800
From:   Chao Fan <fanc.fnst@...fujitsu.com>
To:     Borislav Petkov <bp@...en8.de>
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 Mon, Jan 28, 2019 at 06:51:32PM +0100, Borislav Petkov wrote:
>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.

Hi Boris,

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

Thanks for your fix, your change looks good.
>
>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

I clone your branch and test some cases. Except the build issue of
cmdline_find_option(), PATCHSET works well.
Build in x86_64 and i386.
Tested EFI/BIOS environment in x86_64 and BIOS environment in i386.
Tested the 'acpi_rsdp=' and 'boot_params->acpi_rsdp_addr' issue, all
work well.

Thanks,
Chao Fan

>
>Thx.
>
>-- 
>Regards/Gruss,
>    Boris.
>
>Good mailing practices for 400: avoid top-posting and trim the reply.
>
>