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 --- lib/efi_loader/efi_boottime.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c index 18ca96791c..ce658a8e73 100644 --- a/lib/efi_loader/efi_boottime.c +++ b/lib/efi_loader/efi_boottime.c @@ -687,8 +687,15 @@ efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl, 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), -- 2.29.2