linux-kernel - Re: [PATCH v14 0/6] Carry forward IMA measurement log on kexec on ARM64

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Message-ID: <14f80991-92db-68ec-7c60-5f868a9bd57a@linux.microsoft.com>
Date:   Tue, 12 Jan 2021 10:24:14 -0800
From:   Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>, Rob Herring <robh@...nel.org>
Cc:     bauerman@...ux.ibm.com, takahiro.akashi@...aro.org,
        gregkh@...uxfoundation.org, will@...nel.org,
        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, bhsharma@...hat.com, 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@...r.kernel.org
Subject: Re: [PATCH v14 0/6] Carry forward IMA measurement log on kexec on
 ARM64

On 1/12/21 10:05 AM, Mimi Zohar wrote:
> On Tue, 2021-01-12 at 08:42 -0600, Rob Herring wrote:
>> On Mon, Jan 04, 2021 at 11:25:56AM -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 a29a64445089 ("powerpc: Use common of_kexec_setup_new_fdt()")
>>> in https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git
>>> "dt/kexec" branch.
>>
>> This all looks good to me. I'd suggest you send the above patches out as
>> part of this series because I don't plan to do so.
>>
>> I would like to also resolve the vmalloc vs. kmalloc difference for
>> allocating the FDT. Then we can further consolidate the DT kexec code.
>>
>> It all needs some acks from arm64 and powerpc maintainers. As far as
>> merging, I think via the integrity tree makes the most sense.
> 
> Thanks, Rob.  Lakshmi,  please update Rob's patches to include patch
> descriptions before re-posting.
> 

Will do Mimi.

thanks,
  -lakshmi