From: Nayna Jain <nayna@linux.ibm.com>
To: linuxppc-dev@ozlabs.org, linux-efi@vger.kernel.org,
linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Michael Ellerman <mpe@ellerman.id.au>,
Paul Mackerras <paulus@samba.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Jeremy Kerr <jk@ozlabs.org>,
Matthew Garret <matthew.garret@nebula.com>,
Mimi Zohar <zohar@linux.ibm.com>,
Claudio Carvalho <cclaudio@linux.ibm.com>,
Nayna Jain <nayna@linux.ibm.com>
Subject: [PATCH v3 2/3] powerpc/powernv: detect the secure boot mode of the system
Date: Mon, 10 Jun 2019 16:33:56 -0400 [thread overview]
Message-ID: <1560198837-18857-3-git-send-email-nayna@linux.ibm.com> (raw)
In-Reply-To: <1560198837-18857-1-git-send-email-nayna@linux.ibm.com>
PowerNV secure boot 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.
Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
---
arch/powerpc/include/asm/secboot.h | 21 ++++++++
arch/powerpc/platforms/powernv/Makefile | 3 +-
arch/powerpc/platforms/powernv/secboot.c | 61 ++++++++++++++++++++++++
3 files changed, 84 insertions(+), 1 deletion(-)
create mode 100644 arch/powerpc/include/asm/secboot.h
create mode 100644 arch/powerpc/platforms/powernv/secboot.c
diff --git a/arch/powerpc/include/asm/secboot.h b/arch/powerpc/include/asm/secboot.h
new file mode 100644
index 000000000000..1904fb4a3352
--- /dev/null
+++ b/arch/powerpc/include/asm/secboot.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * PowerPC secure boot definitions
+ *
+ * Copyright (C) 2019 IBM Corporation
+ * Author: Nayna Jain <nayna@linux.ibm.com>
+ *
+ */
+#ifndef POWERPC_SECBOOT_H
+#define POWERPC_SECBOOT_H
+
+#if defined(CONFIG_OPAL_SECVAR)
+extern bool get_powerpc_sb_mode(void);
+#else
+static inline bool get_powerpc_sb_mode(void)
+{
+ return false;
+}
+#endif
+
+#endif
diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile
index 6651c742e530..74705a3fc474 100644
--- a/arch/powerpc/platforms/powernv/Makefile
+++ b/arch/powerpc/platforms/powernv/Makefile
@@ -4,6 +4,7 @@ obj-y += idle.o opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o
obj-y += rng.o opal-elog.o opal-dump.o opal-sysparam.o opal-sensor.o
obj-y += opal-msglog.o opal-hmi.o opal-power.o opal-irqchip.o
obj-y += opal-kmsg.o opal-powercap.o opal-psr.o opal-sensor-groups.o
+obj-y += secboot.o
obj-$(CONFIG_SMP) += smp.o subcore.o subcore-asm.o
obj-$(CONFIG_PCI) += pci.o pci-ioda.o npu-dma.o pci-ioda-tce.o
@@ -16,4 +17,4 @@ obj-$(CONFIG_PERF_EVENTS) += opal-imc.o
obj-$(CONFIG_PPC_MEMTRACE) += memtrace.o
obj-$(CONFIG_PPC_VAS) += vas.o vas-window.o vas-debug.o
obj-$(CONFIG_OCXL_BASE) += ocxl.o
-obj-$(CONFIG_OPAL_SECVAR) += opal-secvar.o
+obj-$(CONFIG_OPAL_SECVAR) += opal-secvar.o secboot.o
diff --git a/arch/powerpc/platforms/powernv/secboot.c b/arch/powerpc/platforms/powernv/secboot.c
new file mode 100644
index 000000000000..9199e520ebed
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/secboot.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 IBM Corporation
+ * Author: Nayna Jain <nayna@linux.ibm.com>
+ *
+ * secboot.c
+ * - util function to get powerpc secboot state
+ */
+#include <linux/uuid.h>
+#include <asm/opal.h>
+#include <asm/secboot.h>
+#include <asm/opal-secvar.h>
+
+bool get_powerpc_sb_mode(void)
+{
+ u8 secure_boot_name[] = "SecureBoot";
+ u8 setup_mode_name[] = "SetupMode";
+ u8 secboot, setupmode;
+ unsigned long size = sizeof(secboot);
+ int status;
+ unsigned long version;
+
+ status = opal_variable_version(&version);
+ if ((status != OPAL_SUCCESS) || (version != BACKEND_TC_COMPAT_V1)) {
+ pr_info("secboot: error retrieving compatible backend\n");
+ return false;
+ }
+
+ status = opal_get_variable(secure_boot_name, sizeof(secure_boot_name),
+ NULL, NULL, &secboot, &size);
+
+ /*
+ * For now assume all failures reading the SecureBoot variable implies
+ * secure boot is not enabled. Later differentiate failure types.
+ */
+ if (status != OPAL_SUCCESS) {
+ secboot = 0;
+ setupmode = 0;
+ goto out;
+ }
+
+ size = sizeof(setupmode);
+ status = opal_get_variable(setup_mode_name, sizeof(setup_mode_name),
+ NULL, NULL, &setupmode, &size);
+
+ /*
+ * Failure to read the SetupMode variable does not prevent
+ * secure boot mode
+ */
+ if (status != OPAL_SUCCESS)
+ setupmode = 0;
+
+out:
+ if ((secboot == 0) || (setupmode == 1)) {
+ pr_info("secboot: secureboot mode disabled\n");
+ return false;
+ }
+
+ pr_info("secboot: secureboot mode enabled\n");
+ return true;
+}
--
2.20.1
next prev parent reply other threads:[~2019-06-10 20:34 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-10 20:33 [PATCH v3 0/3] powerpc: Enabling IMA arch specific secure boot policies Nayna Jain
2019-06-10 20:33 ` [PATCH v3 1/3] powerpc/powernv: Add OPAL API interface to get secureboot state Nayna Jain
2019-06-12 6:17 ` Daniel Axtens
[not found] ` <eaa37bd0-a77d-d70a-feb5-c0e73ce231bf@linux.vnet.ibm.com>
2019-06-12 23:04 ` Daniel Axtens
2019-06-14 22:22 ` Nayna
2019-06-16 23:56 ` Daniel Axtens
2019-06-10 20:33 ` Nayna Jain [this message]
2019-06-10 20:33 ` [PATCH v3 3/3] powerpc: Add support to initialize ima policy rules Nayna Jain
2019-06-11 5:19 ` Satheesh Rajendran
2019-06-11 17:07 ` Nayna
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