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Commit 06f7d4a1 authored by Compostella, Jeremy's avatar Compostella, Jeremy Committed by Ingo Molnar
Browse files

efibc: Add EFI Bootloader Control module 



This module installs a reboot callback, such that if reboot() is invoked
with a string argument NNN, "NNN" is copied to the "LoaderEntryOneShot"
EFI variable, to be read by the bootloader.

If the string matches one of the boot labels defined in its configuration,
the bootloader will boot once to that label.  The "LoaderEntryRebootReason"
EFI variable is set with the reboot reason: "reboot", "shutdown".

The bootloader reads this reboot reason and takes particular action
according to its policy.

There are reboot implementations that do "reboot <reason>", such as
Android's reboot command and Upstart's reboot replacement, which pass
the reason as an argument to the reboot syscall.  There is no
platform-agnostic way how those could be modified to pass the reason
to the bootloader, regardless of platform or bootloader.

Signed-off-by: default avatarJeremy Compostella <jeremy.compostella@intel.com>
Signed-off-by: default avatarMatt Fleming <matt@codeblueprint.co.uk>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stefan Stanacar <stefan.stanacar@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1461614832-17633-26-git-send-email-matt@codeblueprint.co.uk


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 9822504c

drivers/firmware/efi/Kconfig

+15 −0
Original line number Diff line number Diff line
@@ -87,6 +87,21 @@ config EFI_RUNTIME_WRAPPERS 
config EFI_ARMSTUB

	bool



config EFI_BOOTLOADER_CONTROL

	tristate "EFI Bootloader Control"

	depends on EFI_VARS

	default n

	---help---

	  This module installs a reboot hook, such that if reboot() is

	  invoked with a string argument NNN, "NNN" is copied to the

	  "LoaderEntryOneShot" EFI variable, to be read by the

	  bootloader. If the string matches one of the boot labels

	  defined in its configuration, the bootloader will boot once

	  to that label. The "LoaderEntryRebootReason" EFI variable is

	  set with the reboot reason: "reboot" or "shutdown". The

	  bootloader reads this reboot reason and takes particular

	  action according to its policy.



endmenu



config UEFI_CPER

drivers/firmware/efi/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ obj-$(CONFIG_EFI_RUNTIME_MAP) += runtime-map.o 
obj-$(CONFIG_EFI_RUNTIME_WRAPPERS)	+= runtime-wrappers.o

obj-$(CONFIG_EFI_STUB)			+= libstub/

obj-$(CONFIG_EFI_FAKE_MEMMAP)		+= fake_mem.o

obj-$(CONFIG_EFI_BOOTLOADER_CONTROL)	+= efibc.o



arm-obj-$(CONFIG_EFI)			:= arm-init.o arm-runtime.o

obj-$(CONFIG_ARM)			+= $(arm-obj-y)

drivers/firmware/efi/efibc.c

0 → 100644
+101 −0
Original line number Diff line number Diff line 
/*

 * efibc: control EFI bootloaders which obey LoaderEntryOneShot var

 * Copyright (c) 2013-2016, Intel Corporation.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 */



#define pr_fmt(fmt) "efibc: " fmt



#include <linux/efi.h>

#include <linux/module.h>

#include <linux/reboot.h>



static void efibc_str_to_str16(const char *str, efi_char16_t *str16)

{

	size_t i;



	for (i = 0; i < strlen(str); i++)

		str16[i] = str[i];



	str16[i] = '\0';

}



static void efibc_set_variable(const char *name, const char *value)

{

	int ret;

	efi_guid_t guid = LINUX_EFI_LOADER_ENTRY_GUID;

	struct efivar_entry entry;

	size_t size = (strlen(value) + 1) * sizeof(efi_char16_t);



	if (size > sizeof(entry.var.Data))

		pr_err("value is too large");



	efibc_str_to_str16(name, entry.var.VariableName);

	efibc_str_to_str16(value, (efi_char16_t *)entry.var.Data);

	memcpy(&entry.var.VendorGuid, &guid, sizeof(guid));



	ret = efivar_entry_set(&entry,

			       EFI_VARIABLE_NON_VOLATILE

			       | EFI_VARIABLE_BOOTSERVICE_ACCESS

			       | EFI_VARIABLE_RUNTIME_ACCESS,

			       size, entry.var.Data, NULL);

	if (ret)

		pr_err("failed to set %s EFI variable: 0x%x\n",

		       name, ret);

}



static int efibc_reboot_notifier_call(struct notifier_block *notifier,

				      unsigned long event, void *data)

{

	const char *reason = "shutdown";



	if (event == SYS_RESTART)

		reason = "reboot";



	efibc_set_variable("LoaderEntryRebootReason", reason);



	if (!data)

		return NOTIFY_DONE;



	efibc_set_variable("LoaderEntryOneShot", (char *)data);



	return NOTIFY_DONE;

}



static struct notifier_block efibc_reboot_notifier = {

	.notifier_call = efibc_reboot_notifier_call,

};



static int __init efibc_init(void)

{

	int ret;



	if (!efi_enabled(EFI_RUNTIME_SERVICES))

		return -ENODEV;



	ret = register_reboot_notifier(&efibc_reboot_notifier);

	if (ret)

		pr_err("unable to register reboot notifier\n");



	return ret;

}

module_init(efibc_init);



static void __exit efibc_exit(void)

{

	unregister_reboot_notifier(&efibc_reboot_notifier);

}

module_exit(efibc_exit);



MODULE_AUTHOR("Jeremy Compostella <jeremy.compostella@intel.com>");

MODULE_AUTHOR("Matt Gumbel <matthew.k.gumbel@intel.com");

MODULE_DESCRIPTION("EFI Bootloader Control");

MODULE_LICENSE("GPL v2");

include/linux/efi.h

+4 −0
Original line number Diff line number Diff line
@@ -642,6 +642,10 @@ void efi_native_runtime_setup(void); 
	EFI_GUID(0xe03fc20a, 0x85dc, 0x406e, \

		 0xb9, 0xe, 0x4a, 0xb5, 0x02, 0x37, 0x1d, 0x95)



#define LINUX_EFI_LOADER_ENTRY_GUID \

	EFI_GUID(0x4a67b082, 0x0a4c, 0x41cf, \

		 0xb6, 0xc7, 0x44, 0x0b, 0x29, 0xbb, 0x8c, 0x4f)



typedef struct {

	efi_guid_t guid;

	u64 table;