The keys used to verify the Host OS kernel are managed by OPAL as secure
variables. This patch loads the verification keys into the .platform
keyring and revocation keys into .blacklist keyring. This enables
verification and loading of the kernels signed by the boot time keys which
are trusted by firmware.

Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
---
 security/integrity/Kconfig                    |  9 ++
 security/integrity/Makefile                   |  3 +
 .../integrity/platform_certs/load_powerpc.c   | 94 +++++++++++++++++++
 3 files changed, 106 insertions(+)
 create mode 100644 security/integrity/platform_certs/load_powerpc.c

diff --git a/security/integrity/Kconfig b/security/integrity/Kconfig
index 0bae6adb63a9..2b4109c157e2 100644
--- a/security/integrity/Kconfig
+++ b/security/integrity/Kconfig

@@ -72,6 +72,15 @@ config LOAD_IPL_KEYS
        depends on S390
        def_bool y
 
+config LOAD_PPC_KEYS
+	bool "Enable loading of platform and revocation keys for POWER"
+	depends on INTEGRITY_PLATFORM_KEYRING
+	depends on PPC_SECURE_BOOT
+	def_bool y

+	help
+	  Enable loading of db keys to the .platform keyring and dbx keys to
+	  the .blacklist keyring for powerpc based platforms.
+
 config INTEGRITY_AUDIT
 	bool "Enables integrity auditing support "
 	depends on AUDIT

diff --git a/security/integrity/Makefile b/security/integrity/Makefile
index 525bf1d6e0db..9eeb6b053de3 100644
--- a/security/integrity/Makefile
+++ b/security/integrity/Makefile

@@ -14,6 +14,9 @@ integrity-$(CONFIG_LOAD_UEFI_KEYS) += platform_certs/efi_parser.o \
 				      platform_certs/load_uefi.o \
 				      platform_certs/keyring_handler.o
 integrity-$(CONFIG_LOAD_IPL_KEYS) += platform_certs/load_ipl_s390.o
+integrity-$(CONFIG_LOAD_PPC_KEYS) += platform_certs/efi_parser.o \
+					 platform_certs/load_powerpc.o \
+					 platform_certs/keyring_handler.o
 $(obj)/load_uefi.o: KBUILD_CFLAGS += -fshort-wchar

 subdir-$(CONFIG_IMA)			+= ima

diff --git a/security/integrity/platform_certs/load_powerpc.c b/security/integrity/platform_certs/load_powerpc.c
new file mode 100644
index 000000000000..f4d869171062
--- /dev/null
+++ b/security/integrity/platform_certs/load_powerpc.c

@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 IBM Corporation
+ * Author: Nayna Jain <nayna@linux.ibm.com>
+ *
+ * load_powernv.c