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

Rob Herring
2021-02-10T17:16:39Z

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.

Rob