Secure boot on PowerNV defines different IMA policies based on the secure
boot state of the system.
This patch defines a function to detect the secure boot state of the
system.
The PPC_SECURE_BOOT config represents the base enablement of secureboot
on POWER.
Signed-off-by: Nayna Jain <nayna@xxxxxxxxxxxxx>
---
arch/powerpc/Kconfig | 10 ++++++
arch/powerpc/include/asm/secure_boot.h | 29 ++++++++++++++++++
arch/powerpc/kernel/Makefile | 2 ++
arch/powerpc/kernel/secure_boot.c | 42 ++++++++++++++++++++++++++
4 files changed, 83 insertions(+)
create mode 100644 arch/powerpc/include/asm/secure_boot.h
create mode 100644 arch/powerpc/kernel/secure_boot.c
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 3e56c9c2f16e..b4a221886fcf 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -934,6 +934,16 @@ config PPC_MEM_KEYS
If unsure, say y.
+config PPC_SECURE_BOOT
+ prompt "Enable secure boot support"
+ bool
+ depends on PPC_POWERNV
+ help
+ Systems with firmware secure boot enabled needs to define security
+ policies to extend secure boot to the OS. This config allows user
+ to enable OS secure boot on systems that have firmware support for
+ it. If in doubt say N.
+
endmenu
config ISA_DMA_API
diff --git a/arch/powerpc/include/asm/secure_boot.h b/arch/powerpc/include/asm/secure_boot.h
new file mode 100644
index 000000000000..23d2ef2f1f7b
--- /dev/null
+++ b/arch/powerpc/include/asm/secure_boot.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Secure boot definitions
+ *
+ * Copyright (C) 2019 IBM Corporation
+ * Author: Nayna Jain
+ */
+#ifndef _ASM_POWER_SECURE_BOOT_H
+#define _ASM_POWER_SECURE_BOOT_H
+
+#ifdef CONFIG_PPC_SECURE_BOOT
+
+bool is_powerpc_os_secureboot_enabled(void);
+struct device_node *get_powerpc_os_sb_node(void);
+
+#else
+
+static inline bool is_powerpc_os_secureboot_enabled(void)
+{
+ return false;
+}
+
+static inline struct device_node *get_powerpc_os_sb_node(void)
+{
+ return NULL;
+}
+
+#endif
+#endif
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index a7ca8fe62368..e2a54fa240ac 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -161,6 +161,8 @@ ifneq ($(CONFIG_PPC_POWERNV)$(CONFIG_PPC_SVM),)
obj-y += ucall.o
endif
+obj-$(CONFIG_PPC_SECURE_BOOT) += secure_boot.o
+
# Disable GCOV, KCOV & sanitizers in odd or sensitive code
GCOV_PROFILE_prom_init.o := n
KCOV_INSTRUMENT_prom_init.o := n
diff --git a/arch/powerpc/kernel/secure_boot.c b/arch/powerpc/kernel/secure_boot.c
new file mode 100644
index 000000000000..0488dbcab6b9
--- /dev/null
+++ b/arch/powerpc/kernel/secure_boot.c
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 IBM Corporation
+ * Author: Nayna Jain
+ */
+#include <linux/types.h>
+#include <linux/of.h>
+#include <asm/secure_boot.h>
+
+struct device_node *get_powerpc_os_sb_node(void)
+{
+ return of_find_compatible_node(NULL, NULL, "ibm,secvar-v1");
+}
+
+bool is_powerpc_os_secureboot_enabled(void)
+{
+ struct device_node *node;
+
+ node = get_powerpc_os_sb_node();
+ if (!node)
+ goto disabled;
+
+ if (!of_device_is_available(node)) {
+ pr_err("Secure variables support is in error state, fail secure\n");
+ goto enabled;
+ }
+
+ /*
+ * secureboot is enabled if os-secure-enforcing property exists,
+ * else disabled.
+ */
+ if (!of_find_property(node, "os-secure-enforcing", NULL))
+ goto disabled;
+
+enabled:
+ pr_info("secureboot mode enabled\n");
+ return true;
+
+disabled:
+ pr_info("secureboot mode disabled\n");
+ return false;
+}
--
2.20.1
