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From: Nayna Jain <nayna@linux.ibm.com>
To: linuxppc-dev@ozlabs.org, linux-efi@vger.kernel.org,
	linux-integrity@vger.kernel.org
Cc: linux-kernel@vger.kernel.org,
	Michael Ellerman <mpe@ellerman.id.au>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Jeremy Kerr <jk@ozlabs.org>,
	Matthew Garret <matthew.garret@nebula.com>,
	Mimi Zohar <zohar@linux.ibm.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Claudio Carvalho <cclaudio@linux.ibm.com>,
	George Wilson <gcwilson@linux.ibm.com>,
	Elaine Palmer <erpalmer@us.ibm.com>,
	Eric Ricther <erichte@linux.ibm.com>,
	"Oliver O'Halloran" <oohall@gmail.com>,
	Nayna Jain <nayna@linux.ibm.com>,
	Prakhar Srivastava <prsriva02@gmail.com>,
	Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Subject: [PATCH v9 1/8] powerpc: detect the secure boot mode of the system
Date: Wed, 23 Oct 2019 22:47:10 -0500
Message-ID: <20191024034717.70552-2-nayna@linux.ibm.com> (raw)
In-Reply-To: <20191024034717.70552-1-nayna@linux.ibm.com>

This patch defines a function to detect the secure boot state of a
PowerNV system.

The PPC_SECURE_BOOT config represents the base enablement of secure boot
for powerpc.

Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
---
 arch/powerpc/Kconfig                   | 10 ++++++++
 arch/powerpc/include/asm/secure_boot.h | 23 ++++++++++++++++++
 arch/powerpc/kernel/Makefile           |  2 ++
 arch/powerpc/kernel/secure_boot.c      | 32 ++++++++++++++++++++++++++
 4 files changed, 67 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..56ea0019b616 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 need to define security
+	  policies to extend secure boot to the OS. This config allows a 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..07d0fe0ca81f
--- /dev/null
+++ b/arch/powerpc/include/asm/secure_boot.h
@@ -0,0 +1,23 @@
+/* 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_ppc_secureboot_enabled(void);
+
+#else
+
+static inline bool is_ppc_secureboot_enabled(void)
+{
+	return false;
+}
+
+#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..63dc82c50862
--- /dev/null
+++ b/arch/powerpc/kernel/secure_boot.c
@@ -0,0 +1,32 @@
+// 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>
+
+bool is_ppc_secureboot_enabled(void)
+{
+	struct device_node *node;
+	bool enabled = false;
+
+	node = of_find_compatible_node(NULL, NULL, "ibm,secvar-v1");
+	if (!of_device_is_available(node)) {
+		pr_err("Cannot find secure variable node in device tree; failing to secure state\n");
+		goto out;
+	}
+
+	/*
+	 * secureboot is enabled if os-secure-enforcing property exists,
+	 * else disabled.
+	 */
+	enabled = of_property_read_bool(node, "os-secure-enforcing");
+
+out:
+	of_node_put(node);
+
+	pr_info("Secure boot mode %s\n", enabled ? "enabled" : "disabled");
+	return enabled;
+}
-- 
2.20.1


  reply index

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-24  3:47 [PATCH v9 0/8] powerpc: Enabling IMA arch specific secure boot policies Nayna Jain
2019-10-24  3:47 ` Nayna Jain [this message]
2019-10-24 17:26   ` [PATCH v9 1/8] powerpc: detect the secure boot mode of the system Lakshmi Ramasubramanian
2019-10-25 16:49     ` Nayna Jain
2019-10-24  3:47 ` [PATCH v9 2/8] powerpc/ima: add support to initialize ima policy rules Nayna Jain
2019-10-24 17:35   ` Lakshmi Ramasubramanian
2019-10-25 17:02     ` Nayna Jain
2019-10-25 18:03       ` Lakshmi Ramasubramanian
2019-10-28 23:42         ` Michael Ellerman
2019-10-26 23:52       ` Mimi Zohar
2019-10-28 11:54         ` Mimi Zohar
2019-10-24  3:47 ` [PATCH v9 3/8] powerpc: detect the trusted boot state of the system Nayna Jain
2019-10-24 17:38   ` Lakshmi Ramasubramanian
2019-10-25 16:50     ` Nayna Jain
2019-10-24  3:47 ` [PATCH v9 4/8] powerpc/ima: define trusted boot policy Nayna Jain
2019-10-24 17:40   ` Lakshmi Ramasubramanian
2019-10-24  3:47 ` [PATCH v9 5/8] ima: make process_buffer_measurement() generic Nayna Jain
2019-10-24 15:20   ` Lakshmi Ramasubramanian
2019-10-25 17:24     ` Nayna Jain
2019-10-25 17:32       ` Lakshmi Ramasubramanian
2019-10-27  0:13         ` Mimi Zohar
2019-10-30 15:22   ` Lakshmi Ramasubramanian
2019-10-30 16:35     ` Mimi Zohar
2019-10-24  3:47 ` [PATCH v9 6/8] certs: add wrapper function to check blacklisted binary hash Nayna Jain
2019-10-24  3:47 ` [PATCH v9 7/8] ima: check against blacklisted hashes for files with modsig Nayna Jain
2019-10-24 17:48   ` Lakshmi Ramasubramanian
2019-10-25 17:36     ` Nayna Jain
2019-10-24  3:47 ` [PATCH v9 8/8] powerpc/ima: update ima arch policy to check for blacklist Nayna Jain
2019-10-28 12:10 ` [PATCH v9 0/8] powerpc: Enabling IMA arch specific secure boot policies Mimi Zohar

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