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 <takahiro.akashi@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
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 @@
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));