linux-kernel - [PATCH v3 3/3] arm64/ima: add ima

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Date:   Fri, 30 Oct 2020 14:08:40 +0800
From:   Chester Lin <clin@...e.com>
To:     ardb@...nel.org, zohar@...ux.ibm.com, jmorris@...ei.org,
        serge@...lyn.com, dmitry.kasatkin@...il.com,
        catalin.marinas@....com, will@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com
CC:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-efi@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, x86@...nel.org,
        jlee@...e.com, clin@...e.com
Subject: [PATCH v3 3/3] arm64/ima: add ima_arch support

Add arm64 IMA arch support. The code and arch policy is mainly inherited
from x86.

Signed-off-by: Chester Lin <clin@...e.com>
---
 arch/arm64/Kconfig           |  1 +
 arch/arm64/kernel/Makefile   |  2 ++
 arch/arm64/kernel/ima_arch.c | 43 ++++++++++++++++++++++++++++++++++++
 3 files changed, 46 insertions(+)
 create mode 100644 arch/arm64/kernel/ima_arch.c

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index a42e8d13cc88..496a4a26afc6 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -201,6 +201,7 @@ config ARM64
 	select SWIOTLB
 	select SYSCTL_EXCEPTION_TRACE
 	select THREAD_INFO_IN_TASK
+	imply IMA_SECURE_AND_OR_TRUSTED_BOOT if EFI
 	help
 	  ARM 64-bit (AArch64) Linux support.
 
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index bbaf0bc4ad60..0f6cbb50668c 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -69,3 +69,5 @@ extra-y					+= $(head-y) vmlinux.lds
 ifeq ($(CONFIG_DEBUG_EFI),y)
 AFLAGS_head.o += -DVMLINUX_PATH="\"$(realpath $(objtree)/vmlinux)\""
 endif
+
+obj-$(CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT)	+= ima_arch.o
diff --git a/arch/arm64/kernel/ima_arch.c b/arch/arm64/kernel/ima_arch.c
new file mode 100644
index 000000000000..564236d77adc
--- /dev/null
+++ b/arch/arm64/kernel/ima_arch.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 IBM Corporation
+ */
+#include <linux/efi.h>
+#include <linux/module.h>
+#include <linux/ima.h>
+
+bool arch_ima_get_secureboot(void)
+{
+	static bool sb_enabled;
+	static bool initialized;
+
+	if (!initialized & efi_enabled(EFI_BOOT)) {
+		sb_enabled = ima_get_efi_secureboot();
+		initialized = true;
+	}
+
+	return sb_enabled;
+}
+
+/* secure and trusted boot arch rules */
+static const char * const sb_arch_rules[] = {
+#if !IS_ENABLED(CONFIG_KEXEC_SIG)
+	"appraise func=KEXEC_KERNEL_CHECK appraise_type=imasig",
+#endif /* CONFIG_KEXEC_SIG */
+	"measure func=KEXEC_KERNEL_CHECK",
+#if !IS_ENABLED(CONFIG_MODULE_SIG)
+	"appraise func=MODULE_CHECK appraise_type=imasig",
+#endif
+	"measure func=MODULE_CHECK",
+	NULL
+};
+
+const char * const *arch_get_ima_policy(void)
+{
+	if (IS_ENABLED(CONFIG_IMA_ARCH_POLICY) && arch_ima_get_secureboot()) {
+		if (IS_ENABLED(CONFIG_MODULE_SIG))
+			set_module_sig_enforced();
+		return sb_arch_rules;
+	}
+	return NULL;
+}
-- 
2.28.0