[PATCH 1/3] integrity: Make arch_ima_get_secureboot integrity-wide

@@ -2427,6 +2427,7 @@ config EFI
 	select EFI_STUB
 	select EFI_GENERIC_STUB
 	imply IMA_SECURE_AND_OR_TRUSTED_BOOT
+	imply INTEGRITY_SECURE_BOOT
 	default y
 	help
 	  This option provides support for runtime services provided

@@ -1058,6 +1058,7 @@ config PPC_SECURE_BOOT
 	depends on PPC_POWERNV || PPC_PSERIES
 	depends on IMA_ARCH_POLICY
 	imply IMA_SECURE_AND_OR_TRUSTED_BOOT
+	imply INTEGRITY_SECURE_BOOT
 	select PSERIES_PLPKS if PPC_PSERIES
 	help
 	  Systems with firmware secure boot enabled need to define security

@@ -168,7 +168,7 @@ ifneq ($(CONFIG_PPC_POWERNV)$(CONFIG_PPC_SVM),)
 obj-y				+= ucall.o
 endif
 
-obj-$(CONFIG_PPC_SECURE_BOOT)	+= secure_boot.o ima_arch.o secvar-ops.o
+obj-$(CONFIG_PPC_SECURE_BOOT)	+= secure_boot.o ima_arch.o integrity_sb_arch.o secvar-ops.o
 obj-$(CONFIG_PPC_SECVAR_SYSFS)	+= secvar-sysfs.o
 
 # Disable GCOV, KCOV & sanitizers in odd or sensitive code

@@ -7,11 +7,6 @@
 #include <linux/ima.h>
 #include <asm/secure_boot.h>
 
-bool arch_ima_get_secureboot(void)
-{
-	return is_ppc_secureboot_enabled();
-}
-
 /*
  * The "secure_rules" are enabled only on "secureboot" enabled systems.
  * These rules verify the file signatures against known good values.

@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 IBM Corporation
+ * Author: Nayna Jain
+ */
+
+#include <linux/integrity.h>
+#include <asm/secure_boot.h>
+
+bool arch_integrity_get_secureboot(void)
+{
+	return is_ppc_secureboot_enabled();
+}

@@ -78,6 +78,7 @@ config S390
 	# Note: keep this list sorted alphabetically
 	#
 	imply IMA_SECURE_AND_OR_TRUSTED_BOOT
+	imply INTEGRITY_SECURE_BOOT
 	select ALTERNATE_USER_ADDRESS_SPACE
 	select ARCH_32BIT_USTAT_F_TINODE
 	select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE

@@ -72,6 +72,7 @@ obj-$(CONFIG_KEXEC_FILE)	+= machine_kexec_file.o kexec_image.o
 obj-$(CONFIG_KEXEC_FILE)	+= kexec_elf.o
 obj-$(CONFIG_CERT_STORE)	+= cert_store.o
 obj-$(CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT)	+= ima_arch.o
+obj-$(CONFIG_INTEGRITY_SECURE_BOOT)	+= integrity_sb_arch.o
 
 obj-$(CONFIG_PERF_EVENTS)	+= perf_event.o
 obj-$(CONFIG_PERF_EVENTS)	+= perf_cpum_cf.o perf_cpum_sf.o

@@ -1,12 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 
 #include <linux/ima.h>
-#include <asm/boot_data.h>
-
-bool arch_ima_get_secureboot(void)
-{
-	return ipl_secure_flag;
-}
 
 const char * const *arch_get_ima_policy(void)
 {

@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/integrity.h>
+#include <asm/boot_data.h>
+
+bool arch_integrity_get_secureboot(void)
+{
+	return ipl_secure_flag;
+}

@@ -330,6 +330,7 @@ config X86
 	select FUNCTION_ALIGNMENT_16B		if X86_64 || X86_ALIGNMENT_16
 	select FUNCTION_ALIGNMENT_4B
 	imply IMA_SECURE_AND_OR_TRUSTED_BOOT    if EFI
+	imply INTEGRITY_SECURE_BOOT             if EFI
 	select HAVE_DYNAMIC_FTRACE_NO_PATCHABLE
 	select ARCH_SUPPORTS_PT_RECLAIM		if X86_64
 	select ARCH_SUPPORTS_SCHED_SMT		if SMP

@@ -401,9 +401,9 @@ extern int __init efi_memmap_split_count(efi_memory_desc_t *md,
 extern void __init efi_memmap_insert(struct efi_memory_map *old_memmap,
 				     void *buf, struct efi_mem_range *mem);
 
-extern enum efi_secureboot_mode __x86_ima_efi_boot_mode(void);
+enum efi_secureboot_mode __x86_integrity_efi_boot_mode(void);
 
-#define arch_ima_efi_boot_mode	__x86_ima_efi_boot_mode()
+#define arch_integrity_efi_boot_mode __x86_integrity_efi_boot_mode()
 
 #ifdef CONFIG_EFI_RUNTIME_MAP
 int efi_get_runtime_map_size(void);

@@ -921,7 +921,7 @@ umode_t efi_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
 	return attr->mode;
 }
 
-enum efi_secureboot_mode __x86_ima_efi_boot_mode(void)
+enum efi_secureboot_mode __x86_integrity_efi_boot_mode(void)
 {
 	return boot_params.secure_boot;
 }

@@ -11,6 +11,7 @@
 #include <linux/fs.h>
 #include <linux/security.h>
 #include <linux/kexec.h>
+#include <linux/integrity.h>
 #include <crypto/hash_info.h>
 struct linux_binprm;
 

@@ -72,14 +73,8 @@ int __init ima_get_kexec_buffer(void **addr, size_t *size);
 #endif
 
 #ifdef CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT
-extern bool arch_ima_get_secureboot(void);
 extern const char * const *arch_get_ima_policy(void);
 #else
-static inline bool arch_ima_get_secureboot(void)
-{
-	return false;
-}
-
 static inline const char * const *arch_get_ima_policy(void)
 {
 	return NULL;

@@ -61,5 +61,13 @@ integrity_inode_attrs_changed(const struct integrity_inode_attributes *attrs,
 		!inode_eq_iversion(inode, attrs->version));
 }
 
+#ifdef CONFIG_INTEGRITY_SECURE_BOOT
+bool arch_integrity_get_secureboot(void);
+#else
+static inline bool arch_integrity_get_secureboot(void)
+{
+	return false;
+}
+#endif
 
 #endif /* _LINUX_INTEGRITY_H */

@@ -97,6 +97,12 @@ config INTEGRITY_CA_MACHINE_KEYRING_MAX
 	  will not be loaded. The remaining MOK keys are loaded into the
 	  .platform keyring.
 
+config INTEGRITY_SECURE_BOOT
+       bool
+       help
+          This option is selected by architectures to provide secure boot
+          related helper functions.
+
 config LOAD_UEFI_KEYS
 	depends on INTEGRITY_PLATFORM_KEYRING
 	depends on EFI

@@ -18,6 +18,9 @@ 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
+ifeq ($(CONFIG_EFI),y)
+integrity-$(CONFIG_INTEGRITY_SECURE_BOOT) += efi_secureboot.o
+endif
 # The relative order of the 'ima' and 'evm' LSMs depends on the order below.
 obj-$(CONFIG_IMA)			+= ima/
 obj-$(CONFIG_EVM)			+= evm/

@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-1.0+
+/*
+ * Copyright (C) 2018 IBM Corporation
+ */
+#include <linux/efi.h>
+#include <linux/integrity.h>
+#include <asm/efi.h>
+
+#ifndef arch_integrity_efi_boot_mode
+#define arch_integrity_efi_boot_mode efi_secureboot_mode_unset
+#endif
+
+static enum efi_secureboot_mode get_sb_mode(void)
+{
+	enum efi_secureboot_mode mode;
+
+	if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE)) {
+		pr_info("integrity: secureboot mode unknown, no efi\n");
+		return efi_secureboot_mode_unknown;
+	}
+
+	mode = efi_get_secureboot_mode(efi.get_variable);
+	if (mode == efi_secureboot_mode_disabled)
+		pr_info("integrity: secureboot mode disabled\n");
+	else if (mode == efi_secureboot_mode_unknown)
+		pr_info("integrity: secureboot mode unknown\n");
+	else
+		pr_info("integrity: secureboot mode enabled\n");
+	return mode;
+}
+
+/*
+ * Query secure boot status
+ *
+ * Note don't call this function too early e.g. in __setup hook otherwise the
+ * kernel may hang when calling efi_get_secureboot_mode.
+ *
+ */
+bool arch_integrity_get_secureboot(void)
+{
+	static enum efi_secureboot_mode sb_mode;
+	static bool initialized;
+
+	if (!initialized && efi_enabled(EFI_BOOT)) {
+		sb_mode = arch_integrity_efi_boot_mode;
+
+		if (sb_mode == efi_secureboot_mode_unset)
+			sb_mode = get_sb_mode();
+		initialized = true;
+	}
+
+	if (sb_mode == efi_secureboot_mode_enabled)
+		return true;
+	else
+		return false;
+}

@@ -27,7 +27,7 @@ core_param(ima_appraise, ima_appraise_cmdline_default, charp, 0);
 void __init ima_appraise_parse_cmdline(void)
 {
 	const char *str = ima_appraise_cmdline_default;
-	bool sb_state = arch_ima_get_secureboot();
+	bool sb_state = arch_integrity_get_secureboot();
 	int appraisal_state = ima_appraise;
 
 	if (!str)

@@ -2,52 +2,8 @@
 /*
  * Copyright (C) 2018 IBM Corporation
  */
-#include <linux/efi.h>
 #include <linux/module.h>
 #include <linux/ima.h>
-#include <asm/efi.h>
-
-#ifndef arch_ima_efi_boot_mode
-#define arch_ima_efi_boot_mode efi_secureboot_mode_unset
-#endif
-
-static enum efi_secureboot_mode get_sb_mode(void)
-{
-	enum efi_secureboot_mode mode;
-
-	if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE)) {
-		pr_info("ima: secureboot mode unknown, no efi\n");
-		return efi_secureboot_mode_unknown;
-	}
-
-	mode = efi_get_secureboot_mode(efi.get_variable);
-	if (mode == efi_secureboot_mode_disabled)
-		pr_info("ima: secureboot mode disabled\n");
-	else if (mode == efi_secureboot_mode_unknown)
-		pr_info("ima: secureboot mode unknown\n");
-	else
-		pr_info("ima: secureboot mode enabled\n");
-	return mode;
-}
-
-bool arch_ima_get_secureboot(void)
-{
-	static enum efi_secureboot_mode sb_mode;
-	static bool initialized;
-
-	if (!initialized && efi_enabled(EFI_BOOT)) {
-		sb_mode = arch_ima_efi_boot_mode;
-
-		if (sb_mode == efi_secureboot_mode_unset)
-			sb_mode = get_sb_mode();
-		initialized = true;
-	}
-
-	if (sb_mode == efi_secureboot_mode_enabled)
-		return true;
-	else
-		return false;
-}
 
 /* secureboot arch rules */
 static const char * const sb_arch_rules[] = {

@@ -67,7 +23,8 @@ static const char * const sb_arch_rules[] = {
 
 const char * const *arch_get_ima_policy(void)
 {
-	if (IS_ENABLED(CONFIG_IMA_ARCH_POLICY) && arch_ima_get_secureboot()) {
+	if (IS_ENABLED(CONFIG_IMA_ARCH_POLICY) &&
+	    arch_integrity_get_secureboot()) {
 		if (IS_ENABLED(CONFIG_MODULE_SIG))
 			set_module_sig_enforced();
 		if (IS_ENABLED(CONFIG_KEXEC_SIG))

@@ -949,8 +949,8 @@ static int ima_load_data(enum kernel_load_data_id id, bool contents)
 
 	switch (id) {
 	case LOADING_KEXEC_IMAGE:
-		if (IS_ENABLED(CONFIG_KEXEC_SIG)
-		    && arch_ima_get_secureboot()) {
+		if (IS_ENABLED(CONFIG_KEXEC_SIG) &&
+		    arch_integrity_get_secureboot()) {
 			pr_err("impossible to appraise a kernel image without a file descriptor; try using kexec_file_load syscall.\n");
 			return -EACCES;
 		}

@@ -212,7 +212,7 @@ static int __init load_uefi_certs(void)
 	}
 
 	/* the MOK/MOKx can not be trusted when secure boot is disabled */
-	if (!arch_ima_get_secureboot())
+	if (!arch_integrity_get_secureboot())
 		return 0;
 
 	mokx = get_cert_list(L"MokListXRT", &mok_var, &mokxsize, &status);