Initialize UEFI secure boot state during dom0 boot. Otherwise the kernel
may not even know that it runs on secure boot enabled platform.
Signed-off-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
---
arch/x86/xen/efi.c | 57 +++++++++++++++++++++++++++++
drivers/firmware/efi/libstub/secureboot.c | 3 ++
2 files changed, 60 insertions(+)
diff --git a/arch/x86/xen/efi.c b/arch/x86/xen/efi.c
index a18703b..1804b27 100644
--- a/arch/x86/xen/efi.c
+++ b/arch/x86/xen/efi.c
@@ -115,6 +115,61 @@ static efi_system_table_t __init *xen_efi_probe(void)
return &efi_systab_xen;
}
+/*
+ * Determine whether we're in secure boot mode.
+ *
+ * Please keep the logic in sync with
+ * drivers/firmware/efi/libstub/secureboot.c:efi_get_secureboot().
+ */
+static enum efi_secureboot_mode xen_efi_get_secureboot(void)
+{
+ static efi_guid_t efi_variable_guid = EFI_GLOBAL_VARIABLE_GUID;
+ static efi_guid_t shim_guid = EFI_SHIM_LOCK_GUID;
+ efi_status_t status;
+ u8 moksbstate, secboot, setupmode;
+ unsigned long size;
+
+ size = sizeof(secboot);
+ status = efi.get_variable(L"SecureBoot", &efi_variable_guid,
+ NULL, &size, &secboot);
+
+ if (status == EFI_NOT_FOUND)
+ return efi_secureboot_mode_disabled;
+
+ if (status != EFI_SUCCESS)
+ goto out_efi_err;
+
+ size = sizeof(setupmode);
+ status = efi.get_variable(L"SetupMode", &efi_variable_guid,
+ NULL, &size, &setupmode);
+
+ if (status != EFI_SUCCESS)
+ goto out_efi_err;
+
+ if (secboot == 0 || setupmode == 1)
+ return efi_secureboot_mode_disabled;
+
+ /* See if a user has put the shim into insecure mode. */
+ size = sizeof(moksbstate);
+ status = efi.get_variable(L"MokSBStateRT", &shim_guid,
+ NULL, &size, &moksbstate);
+
+ /* If it fails, we don't care why. Default to secure. */
+ if (status != EFI_SUCCESS)
+ goto secure_boot_enabled;
+
+ if (moksbstate == 1)
+ return efi_secureboot_mode_disabled;
+
+ secure_boot_enabled:
+ pr_info("UEFI Secure Boot is enabled.\n");
+ return efi_secureboot_mode_enabled;
+
+ out_efi_err:
+ pr_err("Could not determine UEFI Secure Boot status.\n");
+ return efi_secureboot_mode_unknown;
+}
+
void __init xen_efi_init(void)
{
efi_system_table_t *efi_systab_xen;
@@ -129,6 +184,8 @@ void __init xen_efi_init(void)
boot_params.efi_info.efi_systab = (__u32)__pa(efi_systab_xen);
boot_params.efi_info.efi_systab_hi = (__u32)(__pa(efi_systab_xen) >> 32);
+ boot_params.secure_boot = xen_efi_get_secureboot();
+
set_bit(EFI_BOOT, &efi.flags);
set_bit(EFI_PARAVIRT, &efi.flags);
set_bit(EFI_64BIT, &efi.flags);
diff --git a/drivers/firmware/efi/libstub/secureboot.c b/drivers/firmware/efi/libstub/secureboot.c
index 8f07eb4..72d9dfb 100644
--- a/drivers/firmware/efi/libstub/secureboot.c
+++ b/drivers/firmware/efi/libstub/secureboot.c
@@ -30,6 +30,9 @@
/*
* Determine whether we're in secure boot mode.
+ *
+ * Please keep the logic in sync with
+ * arch/x86/xen/efi.c:xen_efi_get_secureboot().
*/
enum efi_secureboot_mode efi_get_secureboot(efi_system_table_t *sys_table_arg)
{
--
1.7.10.4
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