linux-kernel - Re: [PATCH v9 0/3] integrity: support including firmware ".platform" keys at build time

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Date:   Sat, 5 Mar 2022 07:49:25 +0200
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Nayna Jain <nayna@...ux.ibm.com>
Cc:     linux-integrity@...r.kernel.org, keyrings@...r.kernel.org,
        dhowells@...hat.com, zohar@...ux.ibm.com,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, dimitri.ledkov@...onical.com,
        seth@...shee.me, rnsastry@...ux.ibm.com
Subject: Re: [PATCH v9 0/3] integrity: support including firmware ".platform"
 keys at build time

On Sat, Mar 05, 2022 at 07:37:18AM +0200, Jarkko Sakkinen wrote:
> On Fri, Mar 04, 2022 at 12:54:00PM -0500, Nayna Jain wrote:
> > Some firmware support secure boot by embedding static keys to verify the
> > Linux kernel during boot. However, these firmware do not expose an
> > interface for the kernel to load firmware keys onto the ".platform"
> > keyring, preventing the kernel from verifying the kexec kernel image
> > signature.
> > 
> > This patchset exports load_certificate_list() and defines a new function
> > load_builtin_platform_cert() to load compiled in certificates onto the
> > ".platform" keyring.
> > 
> > Changelog:
> > v9:
> > * Rebased on tpmdd master branch repo - 
> > git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd.git
> > 
> > v8:
> > * Includes Jarkko's feedback on patch description and removed Reported-by
> > for Patch 1.
> > 
> > v7:
> > * Incldues Jarkko's feedback on patch description for Patch 1 and 3.
> > 
> > v6:
> > * Includes Jarkko's feedback:
> >  * Split Patch 2 into two.
> >  * Update Patch description.
> > 
> > v5:
> > * Renamed load_builtin_platform_cert() to load_platform_certificate_list()
> > and config INTEGRITY_PLATFORM_BUILTIN_KEYS to INTEGRITY_PLATFORM_KEYS, as
> > suggested by Mimi Zohar.
> > 
> > v4:
> > * Split into two patches as per Mimi Zohar and Dimitri John Ledkov
> > recommendation.
> > 
> > v3:
> > * Included Jarkko's feedback
> >  ** updated patch description to include approach.
> >  ** removed extern for function declaration in the .h file.
> > * Included load_certificate_list() within #ifdef CONFIG_KEYS condition.
> > 
> > v2:
> > * Fixed the error reported by kernel test robot
> > * Updated patch description based on Jarkko's feedback.
> > 
> > Nayna Jain (3):
> >   certs: export load_certificate_list() to be used outside certs/
> >   integrity: make integrity_keyring_from_id() non-static
> >   integrity: support including firmware ".platform" keys at build time
> > 
> >  certs/Makefile                                |  5 ++--
> >  certs/blacklist.c                             |  1 -
> >  certs/common.c                                |  2 +-
> >  certs/common.h                                |  9 -------
> >  certs/system_keyring.c                        |  1 -
> >  include/keys/system_keyring.h                 |  6 +++++
> >  security/integrity/Kconfig                    | 10 +++++++
> >  security/integrity/Makefile                   | 15 ++++++++++-
> >  security/integrity/digsig.c                   |  2 +-
> >  security/integrity/integrity.h                |  6 +++++
> >  .../integrity/platform_certs/platform_cert.S  | 23 ++++++++++++++++
> >  .../platform_certs/platform_keyring.c         | 26 +++++++++++++++++++
> >  12 files changed, 90 insertions(+), 16 deletions(-)
> >  delete mode 100644 certs/common.h
> >  create mode 100644 security/integrity/platform_certs/platform_cert.S
> > 
> > 
> > base-commit: c9e54f38976a1c0ec69c0a6208b3fd55fceb01d1
> > -- 
> > 2.27.0
> 
> Thank you, applied. 
> 
> BR, Jarkko

You need to fix this:

WARNING: externs should be avoided in .c files
#129: FILE: security/integrity/platform_certs/platform_keyring.c:19:
+extern __initconst const unsigned long platform_certificate_list_size;

I.e. remove extern's from font.

Please send one more version.

BR, Jarkko