linux-kernel - [RFC PATCH 0/2] let kexec_file_load use platform keyring to verify the kernel image

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Date:   Thu, 10 Jan 2019 00:48:22 +0800
From:   Kairui Song <kasong@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     dhowells@...hat.com, dwmw2@...radead.org,
        jwboyer@...oraproject.org, keyrings@...r.kernel.org,
        jmorris@...ei.org, serge@...lyn.com, zohar@...ux.ibm.com,
        bauerman@...ux.ibm.com, ebiggers@...gle.com, nayna@...ux.ibm.com,
        dyoung@...hat.com, linux-integrity@...r.kernel.org,
        kexec@...ts.infradead.org, Kairui Song <kasong@...hat.com>
Subject: [RFC PATCH 0/2] let kexec_file_load use platform keyring to verify the kernel image

Hi,

This is a different approach for the previous patch:
[RFC PATCH 0/1] KEYS, integrity: Link .platform keyring to .secondary_trusted_keys
make kexec_file_load be able to verify the kernel image against keys
provided by platform or firmware.

This patch adds a .platform_trusted_keys in system_keyring as the reference
to .platform keyring in integrity subsystem, when platform keyring is
being initialized it will be updated.

Another thing on my mind is that now kexec_file_load will still relay on
CONFIG_INTEGRITY_PLATFORM_KEYRING and all its dependencies to be enabled
to be able to verify the image against firmware keys. I'm thinking about
to have something like CONFIG_PLATFORM_KEYRING and make the .platform
keyring could be enabled for a more wider usage. Not sure if it's a good
idea though.

Tested in a VM with locally signed kernel with pesign and imported the
cert to EFI's MokList variable.

Kairui Song (2):
  integrity, KEYS: add a reference to platform keyring
  kexec, KEYS: Make use of platform keyring for signature verify

 arch/x86/kernel/kexec-bzimage64.c | 13 ++++++++++---
 certs/system_keyring.c            | 10 +++++++++-
 include/keys/system_keyring.h     |  5 +++++
 include/linux/verification.h      |  1 +
 security/integrity/digsig.c       |  4 ++++
 5 files changed, 29 insertions(+), 4 deletions(-)

-- 
2.20.1