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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: David Howells <dhowells@redhat.com>
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Date: Mon, 30 Sep 2019 21:28:16 +0000
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Subject: [PATCH] efi: Lock down the kernel if booted in secure boot mode
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UEFI Secure Boot provides a mechanism for ensuring that the firmware
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will only load signed bootloaders and kernels. Certain use cases may
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also require that all kernel modules also be signed. Add a
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configuration option that to lock down the kernel - which includes
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requiring validly signed modules - if the kernel is secure-booted.
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Upstream Status: RHEL only
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Signed-off-by: David Howells <dhowells@redhat.com>
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Signed-off-by: Jeremy Cline <jcline@redhat.com>
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---
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arch/x86/kernel/setup.c | 8 ++++++++
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security/lockdown/Kconfig | 13 +++++++++++++
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2 files changed, 21 insertions(+)
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diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
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index 28d43754aeb6..19d57bfc12f9 100644
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--- a/arch/x86/kernel/setup.c
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+++ b/arch/x86/kernel/setup.c
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@@ -18,6 +18,7 @@
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#include <linux/sfi.h>
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#include <linux/hugetlb.h>
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#include <linux/tboot.h>
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+#include <linux/security.h>
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#include <linux/usb/xhci-dbgp.h>
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#include <uapi/linux/mount.h>
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@@ -1105,6 +1106,13 @@ void __init setup_arch(char **cmdline_p)
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if (efi_enabled(EFI_BOOT))
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efi_init();
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+ efi_set_secure_boot(boot_params.secure_boot);
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+
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+#ifdef CONFIG_LOCK_DOWN_IN_EFI_SECURE_BOOT
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+ if (efi_enabled(EFI_SECURE_BOOT))
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+ security_lock_kernel_down("EFI Secure Boot mode", LOCKDOWN_INTEGRITY_MAX);
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+#endif
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+
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dmi_setup();
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/*
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diff --git a/security/lockdown/Kconfig b/security/lockdown/Kconfig
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index e84ddf484010..d0501353a4b9 100644
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--- a/security/lockdown/Kconfig
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+++ b/security/lockdown/Kconfig
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@@ -16,6 +16,19 @@ config SECURITY_LOCKDOWN_LSM_EARLY
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subsystem is fully initialised. If enabled, lockdown will
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unconditionally be called before any other LSMs.
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+config LOCK_DOWN_IN_EFI_SECURE_BOOT
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+ bool "Lock down the kernel in EFI Secure Boot mode"
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+ default n
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+ depends on EFI && SECURITY_LOCKDOWN_LSM_EARLY
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+ help
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+ UEFI Secure Boot provides a mechanism for ensuring that the firmware
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+ will only load signed bootloaders and kernels. Secure boot mode may
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+ be determined from EFI variables provided by the system firmware if
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+ not indicated by the boot parameters.
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+
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+ Enabling this option results in kernel lockdown being triggered if
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+ EFI Secure Boot is set.
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+
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choice
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prompt "Kernel default lockdown mode"
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default LOCK_DOWN_KERNEL_FORCE_NONE
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--
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2.26.2
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