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efi_loader: infinite recursion notifying events

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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>
This commit is contained in:
Heinrich Schuchardt 2019-05-11 21:44:59 +02:00
parent 8ae39857b9
commit 3b985113be
1 changed files with 3 additions and 1 deletions
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4
lib/efi_loader/efi_boottime.c
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@ -181,10 +181,12 @@ static void efi_queue_event(struct efi_event *event, bool check_tpl)
/* Check TPL */ /* Check TPL */
if (check_tpl && efi_tpl >= event->notify_tpl) if (check_tpl && efi_tpl >= event->notify_tpl)
return; return;
event->is_queued = false;
EFI_CALL_VOID(event->notify_function(event, EFI_CALL_VOID(event->notify_function(event,
event->notify_context)); event->notify_context));
} else {
event->is_queued = false;
} }
event->is_queued = false;
} }
/** /**