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Subject: Re: [PATCH v14 0/6] Carry forward IMA measurement log on kexec on
 ARM64
To:     Mimi Zohar <zohar@linux.ibm.com>, Rob Herring <robh@kernel.org>
Cc:     bauerman@linux.ibm.com, takahiro.akashi@linaro.org,
        gregkh@linuxfoundation.org, will@kernel.org,
        catalin.marinas@arm.com, mpe@ellerman.id.au, james.morse@arm.com,
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        serge@hallyn.com, pasha.tatashin@soleen.com, allison@lohutok.net,
        masahiroy@kernel.org, bhsharma@redhat.com, mbrugger@suse.com,
        hsinyi@chromium.org, tao.li@vivo.com, christophe.leroy@c-s.fr,
        prsriva@linux.microsoft.com, balajib@linux.microsoft.com,
        linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
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References: <20210104192602.10131-1-nramas@linux.microsoft.com>
 <20210112144248.GA256955@robh.at.kernel.org>
 <601825013d67584b0d2de7a973b806ec3cbc05ca.camel@linux.ibm.com>
From:   Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Message-ID: <14f80991-92db-68ec-7c60-5f868a9bd57a@linux.microsoft.com>
Date:   Tue, 12 Jan 2021 10:24:14 -0800
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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