efi_loader: notification with TPL_APPLICATION not allowed
The UEFI specification requires event notification levels to be
> TPL_APPLICATION and <= TPL_HIGH_LEVEL.
With the patch the CreateEvent() and CreatedEventEx() services are changed
to check that the notification level is not TPL_APPLICATION.
Reference:
UEFI Specification 2.8 Errata B, table 27 "TPL Restrictions",
"Event Notification Levels"
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 18ca967..ce658a8 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -687,8 +687,15 @@
return EFI_INVALID_PARAMETER;
}
+ /*
+ * The UEFI specification requires event notification levels to be
+ * > TPL_APPLICATION and <= TPL_HIGH_LEVEL.
+ *
+ * Parameter NotifyTpl should not be checked if it is not used.
+ */
if ((type & (EVT_NOTIFY_WAIT | EVT_NOTIFY_SIGNAL)) &&
- (!notify_function || is_valid_tpl(notify_tpl) != EFI_SUCCESS))
+ (!notify_function || is_valid_tpl(notify_tpl) != EFI_SUCCESS ||
+ notify_tpl == TPL_APPLICATION))
return EFI_INVALID_PARAMETER;
ret = efi_allocate_pool(pool_type, sizeof(struct efi_event),