linux-kernel - [PATCH v4 3/4] arch/x86: Implement arch_ima_efi_boot

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Date: Mon,  8 Jan 2024 10:57:29 +0100
From: Thomas Zimmermann <tzimmermann@...e.de>
To: ardb@...nel.org,
	tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	hpa@...or.com,
	bhelgaas@...gle.com,
	arnd@...db.de,
	zohar@...ux.ibm.com,
	dmitry.kasatkin@...il.com,
	paul@...l-moore.com,
	jmorris@...ei.org,
	serge@...lyn.com,
	javierm@...hat.com
Cc: linux-arch@...r.kernel.org,
	linux-efi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org,
	linux-integrity@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Thomas Zimmermann <tzimmermann@...e.de>
Subject: [PATCH v4 3/4] arch/x86: Implement arch_ima_efi_boot_mode() in source file

The x86 implementation of arch_ima_efi_boot_mode() uses the global
boot_param state. Move it into a source file to clean up the header.
Avoid potential rebuilds of unrelated source files if boot_params
changes.

Suggested-by: Ard Biesheuvel <ardb@...nel.org>
Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>
---
 arch/x86/include/asm/efi.h  | 5 +++--
 arch/x86/platform/efi/efi.c | 5 +++++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
index a5d7a83e4c2a..1dc600fa3ba5 100644
--- a/arch/x86/include/asm/efi.h
+++ b/arch/x86/include/asm/efi.h
@@ -409,8 +409,9 @@ 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);
 
-#define arch_ima_efi_boot_mode	\
-	({ extern struct boot_params boot_params; boot_params.secure_boot; })
+extern enum efi_secureboot_mode __x86_ima_efi_boot_mode(void);
+
+#define arch_ima_efi_boot_mode	__x86_ima_efi_boot_mode()
 
 #ifdef CONFIG_EFI_RUNTIME_MAP
 int efi_get_runtime_map_size(void);
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index e9f99c56f3ce..f090ec972d7b 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -950,3 +950,8 @@ 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)
+{
+	return boot_params.secure_boot;
+}
-- 
2.43.0