linux-kernel - [RFC PATCH v1 0/1] Add support for arm64 to carry ima measurement log in kexec_file

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Date:   Mon,  9 Sep 2019 16:14:08 -0700
From:   Prakhar Srivastava <prsriva@...ux.microsoft.com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     arnd@...db.de, jean-philippe@...aro.org, allison@...utok.net,
        kristina.martsenko@....org, yamada.masahiro@...ionext.com,
        duwe@....de, mark.rutland@....com, tglx@...utronix.de,
        takahiro.akashi@...aro.org, james.morse@....org,
        catalin.marinas@....com, sboyd@...nel.org, bauerman@...ux.ibm.com,
        zohar@...ux.ibm.com
Subject: [RFC PATCH v1 0/1] Add support for arm64 to carry ima measurement log in kexec_file_load

Add support for arm64 to carry ima measurement log
to the next kexec'ed session triggered via kexec_file_load.
- Top of Linux 5.3-rc6

Currently during kexec the kernel file signatures are/can be validated
prior to actual load, the information(PE/ima signature) is not carried
to the next session. This lead to loss of information.

Carrying forward the ima measurement log to the next kexec'ed session 
allows a verifying party to get the entire runtime event log since the
last full reboot, since that is when PCRs were last reset.

Changelog:

v1:
  - add new fdt porperties to mark start and end for ima measurement
    log.
  - use fdt_* functions to add/remove fdt properties and memory
    allocations.
  - remove additional check for endian-ness as they are checked
    in fdt_* functions.

v0:
  - Add support to carry ima measurement log in arm64, 
   uses same code as powerpc.

Prakhar Srivastava (1):
  Add support for arm64 to carry ima measurement log in kexec_file_load

 arch/arm64/Kconfig                     |   7 +
 arch/arm64/include/asm/ima.h           |  29 ++++
 arch/arm64/include/asm/kexec.h         |   5 +
 arch/arm64/kernel/Makefile             |   3 +-
 arch/arm64/kernel/ima_kexec.c          | 213 +++++++++++++++++++++++++
 arch/arm64/kernel/machine_kexec_file.c |   6 +
 6 files changed, 262 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm64/include/asm/ima.h
 create mode 100644 arch/arm64/kernel/ima_kexec.c

-- 
2.17.1