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

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Date:   Tue, 12 Jan 2021 13:05:46 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Rob Herring <robh@...nel.org>,
        Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
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 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.

Mimi