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Groups > linux.kernel > #1538503
| From | David Howells <dhowells@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 8/8] efi: Add EFI_SECURE_BOOT bit [ver #6] |
| Date | 2016-12-08 13:40 +0100 |
| Message-ID | <sM69t-68W-57@gated-at.bofh.it> (permalink) |
| References | <sM69r-68W-3@gated-at.bofh.it> |
| Organization | Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 |
From: Josh Boyer <jwboyer@fedoraproject.org>
UEFI machines can be booted in Secure Boot mode. Add a EFI_SECURE_BOOT bit
that can be passed to efi_enabled() to find out whether secure boot is
enabled.
This will be used by the SysRq+x handler, registered by the x86 arch, to find
out whether secure boot mode is enabled so that it can be disabled.
Signed-off-by: Josh Boyer <jwboyer@fedoraproject.org>
Signed-off-by: David Howells <dhowells@redhat.com>
---
arch/x86/kernel/setup.c | 15 +++++++++++++++
include/linux/efi.h | 1 +
2 files changed, 16 insertions(+)
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 9c337b0e8ba7..d8972ec6257d 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1152,6 +1152,21 @@ void __init setup_arch(char **cmdline_p)
/* Allocate bigger log buffer */
setup_log_buf(1);
+ if (IS_ENABLED(CONFIG_EFI)) {
+ switch (boot_params.secure_boot) {
+ case efi_secureboot_mode_disabled:
+ pr_info("Secure boot disabled\n");
+ break;
+ case efi_secureboot_mode_enabled:
+ set_bit(EFI_SECURE_BOOT, &efi.flags);
+ pr_info("Secure boot enabled\n");
+ break;
+ default:
+ pr_info("Secure boot could not be determined\n");
+ break;
+ }
+ }
+
reserve_initrd();
acpi_table_upgrade();
diff --git a/include/linux/efi.h b/include/linux/efi.h
index c894ed5bfa1c..e1893f5002c3 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -1070,6 +1070,7 @@ extern int __init efi_setup_pcdp_console(char *);
#define EFI_ARCH_1 7 /* First arch-specific bit */
#define EFI_DBG 8 /* Print additional debug info at runtime */
#define EFI_NX_PE_DATA 9 /* Can runtime data regions be mapped non-executable? */
+#define EFI_SECURE_BOOT 10 /* Are we in Secure Boot mode? */
#ifdef CONFIG_EFI
/*
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[PATCH 0/8] efi: Pass secure boot mode to kernel [ver #6] David Howells <dhowells@redhat.com> - 2016-12-08 13:40 +0100 [PATCH 8/8] efi: Add EFI_SECURE_BOOT bit [ver #6] David Howells <dhowells@redhat.com> - 2016-12-08 13:40 +0100 [PATCH 2/8] x86/efi: Allow invocation of arbitrary runtime services [ver #6] David Howells <dhowells@redhat.com> - 2016-12-08 13:40 +0100 [PATCH 3/8] arm/efi: Allow invocation of arbitrary runtime services [ver #6] David Howells <dhowells@redhat.com> - 2016-12-08 13:40 +0100 [PATCH 5/8] efi: Get the secure boot status [ver #6] David Howells <dhowells@redhat.com> - 2016-12-08 13:40 +0100
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