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efi: Add an EFI_SECURE_BOOT flag to indicate secure boot mode
UEFI machines can be booted in Secure Boot mode. Add an EFI_SECURE_BOOT flag that can be passed to efi_enabled() to find out whether secure boot is enabled. Move the switch-statement in x86's setup_arch() that inteprets the secure_boot boot parameter to generic code and set the bit there. Upstream Status: RHEL only Suggested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> cc: linux-efi@vger.kernel.org [Rebased for context; efi_is_table_address was moved to arch/x86] Signed-off-by: Jeremy Cline <jcline@redhat.com>
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4 changed files with 52 additions and 19 deletions
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@ -1112,19 +1112,7 @@ void __init setup_arch(char **cmdline_p)
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/* Allocate bigger log buffer */
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setup_log_buf(1);
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if (efi_enabled(EFI_BOOT)) {
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switch (boot_params.secure_boot) {
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case efi_secureboot_mode_disabled:
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pr_info("Secure boot disabled\n");
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break;
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case efi_secureboot_mode_enabled:
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pr_info("Secure boot enabled\n");
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break;
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default:
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pr_info("Secure boot could not be determined\n");
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break;
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}
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}
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efi_set_secure_boot(boot_params.secure_boot);
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reserve_initrd();
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@ -25,6 +25,7 @@ obj-$(CONFIG_EFI_FAKE_MEMMAP) += fake_map.o
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obj-$(CONFIG_EFI_BOOTLOADER_CONTROL) += efibc.o
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obj-$(CONFIG_EFI_TEST) += test/
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obj-$(CONFIG_EFI_DEV_PATH_PARSER) += dev-path-parser.o
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obj-$(CONFIG_EFI) += secureboot.o
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obj-$(CONFIG_APPLE_PROPERTIES) += apple-properties.o
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obj-$(CONFIG_EFI_RCI2_TABLE) += rci2-table.o
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obj-$(CONFIG_EFI_EMBEDDED_FIRMWARE) += embedded-firmware.o
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38
drivers/firmware/efi/secureboot.c
Normal file
38
drivers/firmware/efi/secureboot.c
Normal file
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@ -0,0 +1,38 @@
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/* Core kernel secure boot support.
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*
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* Copyright (C) 2017 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/efi.h>
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#include <linux/kernel.h>
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#include <linux/printk.h>
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/*
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* Decide what to do when UEFI secure boot mode is enabled.
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*/
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void __init efi_set_secure_boot(enum efi_secureboot_mode mode)
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{
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if (efi_enabled(EFI_BOOT)) {
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switch (mode) {
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case efi_secureboot_mode_disabled:
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pr_info("Secure boot disabled\n");
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break;
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case efi_secureboot_mode_enabled:
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set_bit(EFI_SECURE_BOOT, &efi.flags);
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pr_info("Secure boot enabled\n");
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break;
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default:
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pr_warn("Secure boot could not be determined (mode %u)\n",
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mode);
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break;
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}
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}
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}
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@ -788,6 +788,14 @@ extern int __init efi_setup_pcdp_console(char *);
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#define EFI_MEM_ATTR 10 /* Did firmware publish an EFI_MEMORY_ATTRIBUTES table? */
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#define EFI_MEM_NO_SOFT_RESERVE 11 /* Is the kernel configured to ignore soft reservations? */
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#define EFI_PRESERVE_BS_REGIONS 12 /* Are EFI boot-services memory segments available? */
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#define EFI_SECURE_BOOT 13 /* Are we in Secure Boot mode? */
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enum efi_secureboot_mode {
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efi_secureboot_mode_unset,
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efi_secureboot_mode_unknown,
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efi_secureboot_mode_disabled,
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efi_secureboot_mode_enabled,
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};
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#ifdef CONFIG_EFI
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/*
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@ -799,6 +807,8 @@ static inline bool efi_enabled(int feature)
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}
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extern void efi_reboot(enum reboot_mode reboot_mode, const char *__unused);
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extern void __init efi_set_secure_boot(enum efi_secureboot_mode mode);
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bool __pure __efi_soft_reserve_enabled(void);
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static inline bool __pure efi_soft_reserve_enabled(void)
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@ -825,6 +835,8 @@ efi_capsule_pending(int *reset_type)
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return false;
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}
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static inline void efi_set_secure_boot(enum efi_secureboot_mode mode) {}
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static inline bool efi_soft_reserve_enabled(void)
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{
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return false;
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@ -1086,12 +1098,6 @@ static inline bool efi_runtime_disabled(void) { return true; }
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extern void efi_call_virt_check_flags(unsigned long flags, const char *call);
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extern unsigned long efi_call_virt_save_flags(void);
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enum efi_secureboot_mode {
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efi_secureboot_mode_unset,
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efi_secureboot_mode_unknown,
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efi_secureboot_mode_disabled,
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efi_secureboot_mode_enabled,
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};
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enum efi_secureboot_mode efi_get_secureboot(void);
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#ifdef CONFIG_RESET_ATTACK_MITIGATION
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