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From: Prakhar Srivastava <prsriva@linux.microsoft.com>
To: linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-integrity@vger.kernel.org, kexec@lists.infradead.org
Cc: arnd@arndb.de, jean-philippe@linaro.org, allison@lohutok.net,
	kristina.martsenko@arm.org, yamada.masahiro@socionext.com,
	duwe@lst.de, mark.rutland@arm.com, tglx@linutronix.de,
	takahiro.akashi@linaro.org, james.morse@arm.org,
	catalin.marinas@arm.com, sboyd@kernel.org,
	bauerman@linux.ibm.com, zohar@linux.ibm.com
Subject: [PATCH V4 0/2] Add support for arm64 to carry ima measurement
Date: Thu, 10 Oct 2019 17:35:58 -0700
Message-ID: <20191011003600.22090-1-prsriva@linux.microsoft.com> (raw)

Add support 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.

Tested for arm64 qemu and real hardware.
I have not been unable to test the patch for powerpc 64bit. Any testing
is greatly appretiated.

TODO: Add support for 32 bit in the of_ima.c
v4:
  - Fix issue with HAVE_* config wrongly used.

v3:
  - Fix build breaks due to bad config.

v2:
  - move common code to drivers/of/of_ima.c.
  - point arm64 to use of_ima implementation.
  - point powerpc to use of_ima implementation

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 (2):
  Add support for arm64 to carry ima measurement log in kexec_file_load
  update powerpc implementation to call into of_ima*

 arch/arm64/Kconfig                     |   1 +
 arch/arm64/include/asm/ima.h           |  24 +++
 arch/arm64/include/asm/kexec.h         |   5 +
 arch/arm64/kernel/Makefile             |   1 +
 arch/arm64/kernel/ima_kexec.c          |  78 ++++++++++
 arch/arm64/kernel/machine_kexec_file.c |   6 +
 arch/powerpc/include/asm/ima.h         |   5 -
 arch/powerpc/kernel/Makefile           |   3 -
 arch/powerpc/kernel/ima_kexec.c        | 170 ++-------------------
 drivers/of/Kconfig                     |   6 +
 drivers/of/Makefile                    |   1 +
 drivers/of/of_ima.c                    | 204 +++++++++++++++++++++++++
 include/linux/of.h                     |  31 ++++
 13 files changed, 371 insertions(+), 164 deletions(-)
 create mode 100644 arch/arm64/include/asm/ima.h
 create mode 100644 arch/arm64/kernel/ima_kexec.c
 create mode 100644 drivers/of/of_ima.c

-- 
2.17.1


             reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-11  0:35 Prakhar Srivastava [this message]
2019-10-11  0:35 ` [PATCH V4 1/2] Add support for arm64 to carry ima measurement log in kexec_file_load Prakhar Srivastava
2019-10-11  0:36 ` [PATCH V4 2/2] update powerpc implementation to call into of_ima* Prakhar Srivastava
2019-10-14 18:02 ` [PATCH V4 0/2] Add support for arm64 to carry ima measurement James Morse
2019-10-15  1:31   ` prsriva
2019-10-15 17:39     ` James Morse
2019-10-15 18:47       ` Pavel Tatashin
2019-10-21 17:38         ` prsriva
2019-10-25 17:08         ` James Morse
2019-10-15 22:15       ` James Morris
2019-10-16  1:44       ` Mimi Zohar
2019-10-25 17:07         ` James Morse
2019-10-25 17:39           ` Mimi Zohar

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