efi_loader: infinite recursion notifying events
UEFI SCT uses this call sequence to determine the current TPL level inside
notification functions:
OldTpl = BS->RaiseTPL(TPL_HIGH_LEVEL);
BS->RestoreTPL(OldTpl);
In RestoreTPL() we trigger the notification function of queued events. If
we do not mark the event as non-queued before calling the notification
function, this results in an infinite recursive call sequence.
Mark the event as non-queued before entering the notification function.
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 b583ac6..ec6f575 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -181,10 +181,12 @@
/* Check TPL */
if (check_tpl && efi_tpl >= event->notify_tpl)
return;
+ event->is_queued = false;
EFI_CALL_VOID(event->notify_function(event,
event->notify_context));
+ } else {
+ event->is_queued = false;
}
- event->is_queued = false;
}
/**