mirror of
https://github.com/torvalds/linux.git
synced 2026-04-18 06:44:00 -04:00
31a6a07eef
EVM and other LSMs need the ability to query the secure boot status of the system, without directly calling the IMA arch_ima_get_secureboot function. Refactor the secure boot status check into a general function named arch_get_secureboot. Reported-and-suggested-by: Mimi Zohar <zohar@linux.ibm.com> Suggested-by: Roberto Sassu <roberto.sassu@huawei.com> Signed-off-by: Coiby Xu <coxu@redhat.com> Acked-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-1.0+
|
|
/*
|
|
* Copyright (C) 2018 IBM Corporation
|
|
*/
|
|
#include <linux/efi.h>
|
|
#include <linux/secure_boot.h>
|
|
#include <asm/efi.h>
|
|
|
|
#ifndef arch_efi_boot_mode
|
|
#define arch_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_get_secureboot(void)
|
|
{
|
|
static enum efi_secureboot_mode sb_mode;
|
|
static bool initialized;
|
|
|
|
if (!initialized && efi_enabled(EFI_BOOT)) {
|
|
sb_mode = arch_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;
|
|
}
|