From 3748ed908fd478b36bf698839632b2514c450513 Mon Sep 17 00:00:00 2001 From: AKASHI Takahiro Date: Fri, 10 Aug 2018 15:36:32 +0900 Subject: [PATCH] efi_loader: fix a parameter check at CreateEvent() The commit 21b3edfc9644 ("efi_loader: check parameters of CreateEvent") enforces a strict parameter check at CreateEvent(). On the other hand, UEFI specification version 2.7, section 7.1, says: The EVT_NOTIFY_WAIT and EVT_NOTIFY_SIGNAL flags are exclusive. If neither flag is specified, the caller does not require any notification concerning the event and the NotifyTpl, NotifyFunction, and NotifyContext parameters are ignored. So the check should be mitigated so as to comply with the specification. Without this patch, EDK2's Shell.efi won't be started. Fixes: 21b3edfc9644 ("efi_loader: check parameters of CreateEvent") Signed-off-by: AKASHI Takahiro Reviewed-by: Heinrich Schuchardt Signed-off-by: Alexander Graf --- lib/efi_loader/efi_boottime.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c index b9e54f5..1192bdb 100644 --- a/lib/efi_loader/efi_boottime.c +++ b/lib/efi_loader/efi_boottime.c @@ -627,7 +627,8 @@ efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl, return EFI_INVALID_PARAMETER; } - if (is_valid_tpl(notify_tpl) != EFI_SUCCESS) + if ((type & (EVT_NOTIFY_WAIT | EVT_NOTIFY_SIGNAL)) && + (is_valid_tpl(notify_tpl) != EFI_SUCCESS)) return EFI_INVALID_PARAMETER; evt = calloc(1, sizeof(struct efi_event)); -- 2.7.4