Re: [PATCH v19 00/13] Carry forward IMA measurement log on kexec on ARM64

[Lakshmi Ramasubramanian]

On 3/2/21 7:06 AM, Rob Herring wrote:
> On Sun, Feb 21, 2021 at 11:49 AM Lakshmi Ramasubramanian
> <nramas@xxxxxxxxxxxxxxxxxxx> 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 f31e3386a4e9 ("ima: Free IMA measurement buffer after kexec syscall")
> > in https://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git
> > "ima-kexec-fixes" branch.

[...]

> > Lakshmi Ramasubramanian (10):
> >    kexec: Move ELF fields to struct kimage
> >    arm64: Use ELF fields defined in 'struct kimage'
> >    powerpc: Use ELF fields defined in 'struct kimage'
> >    x86: Use ELF fields defined in 'struct kimage'
> >    powerpc: Move ima buffer fields to struct kimage
> >    powerpc: Enable passing IMA log to next kernel on kexec
> >    powerpc: Move arch independent ima kexec functions to
> >      drivers/of/kexec.c
> >    kexec: Use fdt_appendprop_addrrange() to add ima buffer to FDT
> >    powerpc: Delete unused function delete_fdt_mem_rsv()
> >    arm64: Enable passing IMA log to next kernel on kexec
> >
> > Rob Herring (3):
> >    of: Add a common kexec FDT setup function
> >    arm64: Use common of_kexec_alloc_and_setup_fdt()
> >    powerpc: Use common of_kexec_alloc_and_setup_fdt()
> >
> >   arch/arm64/Kconfig                     |   1 +
> >   arch/arm64/include/asm/kexec.h         |   4 -
> >   arch/arm64/kernel/machine_kexec_file.c | 194 +----------
> >   arch/powerpc/Kconfig                   |   2 +-
> >   arch/powerpc/include/asm/ima.h         |  30 --
> >   arch/powerpc/include/asm/kexec.h       |  14 +-
> >   arch/powerpc/kexec/Makefile            |   7 -
> >   arch/powerpc/kexec/elf_64.c            |  30 +-
> >   arch/powerpc/kexec/file_load.c         | 183 +---------
> >   arch/powerpc/kexec/file_load_64.c      |  21 +-
> >   arch/powerpc/kexec/ima.c               | 219 ------------
> >   arch/x86/include/asm/kexec.h           |   5 -
> >   arch/x86/kernel/crash.c                |  14 +-
> >   arch/x86/kernel/kexec-bzimage64.c      |   2 +-
> >   arch/x86/kernel/machine_kexec_64.c     |   4 +-
> >   drivers/of/Makefile                    |   6 +
> >   drivers/of/kexec.c                     | 458 +++++++++++++++++++++++++
> >   include/linux/kexec.h                  |   8 +
> >   include/linux/of.h                     |   7 +
> >   security/integrity/ima/ima.h           |   4 -
> >   security/integrity/ima/ima_kexec.c     |   9 +-
> >   21 files changed, 539 insertions(+), 683 deletions(-)
> >   delete mode 100644 arch/powerpc/include/asm/ima.h
> >   delete mode 100644 arch/powerpc/kexec/ima.c
> >   create mode 100644 drivers/of/kexec.c
>
> I fixed up the Fixes tags and applied for 5.13.

Thanks a lot Rob.

 -lakshmi