linux-kernel - Re: [PATCH v17 00/10] Carry forward IMA measurement log on kexec on ARM64

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Message-ID: <5c002c32-bc49-acda-c641-7b1494ea292d@linux.microsoft.com>
Date:   Wed, 10 Feb 2021 09:33:24 -0800
From:   Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
To:     Rob Herring <robh@...nel.org>
Cc:     zohar@...ux.ibm.com, bauerman@...ux.ibm.com,
        takahiro.akashi@...aro.org, gregkh@...uxfoundation.org,
        will@...nel.org, joe@...ches.com, catalin.marinas@....com,
        mpe@...erman.id.au, james.morse@....com, sashal@...nel.org,
        benh@...nel.crashing.org, paulus@...ba.org, frowand.list@...il.com,
        vincenzo.frascino@....com, mark.rutland@....com,
        dmitry.kasatkin@...il.com, jmorris@...ei.org, serge@...lyn.com,
        pasha.tatashin@...een.com, allison@...utok.net,
        masahiroy@...nel.org, mbrugger@...e.com, hsinyi@...omium.org,
        tao.li@...o.com, christophe.leroy@....fr,
        prsriva@...ux.microsoft.com, balajib@...ux.microsoft.com,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v17 00/10] Carry forward IMA measurement log on kexec on
 ARM64

On 2/10/21 9:15 AM, Rob Herring wrote:
> On Tue, Feb 09, 2021 at 10:21:50AM -0800, Lakshmi Ramasubramanian wrote:
>> On kexec file load Integrity Measurement Architecture (IMA) subsystem
>> may verify the IMA signature of the kernel and initramfs, and measure
>> it.  The command line parameters passed to the kernel in the kexec call
>> may also be measured by IMA.  A remote attestation service can verify
>> a TPM quote based on the TPM event log, the IMA measurement list, and
>> the TPM PCR data.  This can be achieved only if the IMA measurement log
>> is carried over from the current kernel to the next kernel across
>> the kexec call.
>>
>> powerpc already supports carrying forward the IMA measurement log on
>> kexec.  This patch set adds support for carrying forward the IMA
>> measurement log on kexec on ARM64.
>>
>> This patch set moves the platform independent code defined for powerpc
>> such that it can be reused for other platforms as well.  A chosen node
>> "linux,ima-kexec-buffer" is added to the DTB for ARM64 to hold
>> the address and the size of the memory reserved to carry
>> the IMA measurement log.
>>
>> This patch set has been tested for ARM64 platform using QEMU.
>> I would like help from the community for testing this change on powerpc.
>> Thanks.
>>
>> This patch set is based on
>> commit 96acc833dec8 ("ima: Free IMA measurement buffer after kexec syscall")
>> in https://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git
>> "next-integrity" branch.
> 
> Is that a hard dependency still? Given this is now almost entirely
> deleting arch code and adding drivers/of/ code, I was going to apply it.
> 

I tried applying the patches in Linus' mainline branch -
PATCH #5 0005-powerpc-Move-ima-buffer-fields-to-struct-kimage.patch 
doesn't apply.

But if I apply the dependent patch set (link given below), all the 
patches in this patch set apply fine.

https://patchwork.kernel.org/project/linux-integrity/patch/20210204174951.25771-2-nramas@linux.microsoft.com/

thanks,
  -lakshmi