How about the attached additional patch? Should I be checking the UEFI
version number if such is available?
David
---
commit 981110f45ba73798875af7639d0328dc2d6f9919
Author: David Howells <dhowells@xxxxxxxxxx>
Date: Fri Nov 25 11:52:05 2016 +0000
efi: Handle secure boot from UEFI-2.6
UEFI-2.6 adds a new variable, DeployedMode. If it exists, this must be 1
to engage lockdown mode.
Reported-by: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
diff --git a/drivers/firmware/efi/libstub/secureboot.c b/drivers/firmware/efi/libstub/secureboot.c
index ca643eba5a4b..4c3bddef4fb3 100644
--- a/drivers/firmware/efi/libstub/secureboot.c
+++ b/drivers/firmware/efi/libstub/secureboot.c
@@ -22,6 +22,9 @@ static const efi_char16_t const efi_SecureBoot_name[] = {
static const efi_char16_t const efi_SetupMode_name[] = {
'S', 'e', 't', 'u', 'p', 'M', 'o', 'd', 'e', 0
};
+static const efi_char16_t const efi_DeployedMode_name[] = {
+ 'D', 'e', 'p', 'l', 'o', 'y', 'e', 'd', 'M', 'o', 'd', 'e', 0
+};
/* SHIM variables */
static const efi_guid_t shim_guid = EFI_SHIM_LOCK_GUID;
@@ -62,6 +65,16 @@ int efi_get_secureboot(efi_system_table_t *sys_table_arg)
if (val == 1)
return 0;
+ status = get_efi_var(efi_DeployedMode_name, &efi_variable_guid,
+ NULL, &size, &val);
+ if (status != EFI_NOT_FOUND) {
+ if (status != EFI_SUCCESS)
+ goto out_efi_err;
+
+ if (val == 1)
+ return 0;
+ }
+
/* See if a user has put shim into insecure mode. If so, and if the
* variable doesn't have the runtime attribute set, we might as well
* honor that.
--
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