Okay, how about the attached?
Can these variables every be anything other than 1 or 0? E.g. should the
check on SetupMode be that it isn't 0 rather than it is 1?
David
---
commit 6d4bb08e376045e27706c2740c0fdff0a6ec43f7
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
if we're 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..157782d1c552 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 +65,17 @@ int efi_get_secureboot(efi_system_table_t *sys_table_arg)
if (val == 1)
return 0;
+ /* UEFI-2.6 requires DeployedMode to be 1. */
+ if (sys_table_arg->hdr.revision == EFI_2_60_SYSTEM_TABLE_REVISION) {
+ status = get_efi_var(efi_DeployedMode_name, &efi_variable_guid,
+ NULL, &size, &val);
+ 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.
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 333d31bf55bf..563abb37f03f 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -645,6 +645,10 @@ typedef struct {
#define EFI_SYSTEM_TABLE_SIGNATURE ((u64)0x5453595320494249ULL)
+#define EFI_2_60_SYSTEM_TABLE_REVISION ((2 << 16) | (60))
+#define EFI_2_50_SYSTEM_TABLE_REVISION ((2 << 16) | (50))
+#define EFI_2_40_SYSTEM_TABLE_REVISION ((2 << 16) | (40))
+#define EFI_2_31_SYSTEM_TABLE_REVISION ((2 << 16) | (31))
#define EFI_2_30_SYSTEM_TABLE_REVISION ((2 << 16) | (30))
#define EFI_2_20_SYSTEM_TABLE_REVISION ((2 << 16) | (20))
#define EFI_2_10_SYSTEM_TABLE_REVISION ((2 << 16) | (10))
--
To unsubscribe from this list: send the line "unsubscribe linux-efi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
