From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 47DF4EB64DC for ; Mon, 26 Jun 2023 21:16:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230041AbjFZVP5 (ORCPT ); Mon, 26 Jun 2023 17:15:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56036 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229864AbjFZVPz (ORCPT ); Mon, 26 Jun 2023 17:15:55 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DD5CDE4D for ; Mon, 26 Jun 2023 14:15:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1687814111; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type; bh=phZhUFy820bdckUny8npt4P9PZBQ+KMukLBIP/xsC+s=; b=KdXlKQoapGVuV88CaSSSy9X9re/um+SgiXdFC6L/XlwvlZYZBqBbD/kZD/BqByU2ReYrFa vnNRM2niKh8UTNBw5QiJAaWFpDatJeKzrtnQw4yk643FIhO74Vl8ek6vnU4ypWu1hxVGPz mwRC6FERWbckupwyssbf1VcHTOOee40= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-235-cIdWQumrOyiAgAevxvWBiA-1; Mon, 26 Jun 2023 17:15:07 -0400 X-MC-Unique: cIdWQumrOyiAgAevxvWBiA-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id D97EF104458B; Mon, 26 Jun 2023 21:14:42 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.42.28.4]) by smtp.corp.redhat.com (Postfix) with ESMTP id E402F492B01; Mon, 26 Jun 2023 21:14:41 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells To: Jakub Kicinski cc: dhowells@redhat.com, Ilya Dryomov , "David S. Miller" , Eric Dumazet , Paolo Abeni , ceph-devel@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Is ->sendmsg() allowed to change the msghdr struct it is given? MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <3112096.1687814081.1@warthog.procyon.org.uk> Date: Mon, 26 Jun 2023 22:14:41 +0100 Message-ID: <3112097.1687814081@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Jakub, Do you know if ->sendmsg() might alter the msghdr struct it is passed as an argument? Certainly it can alter msg_iter, but can it also modify, say, msg_flags? Thanks, David