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 6EE11C74A5B for ; Wed, 29 Mar 2023 14:18:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231156AbjC2OSB (ORCPT ); Wed, 29 Mar 2023 10:18:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53020 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230099AbjC2ORP (ORCPT ); Wed, 29 Mar 2023 10:17:15 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 379341FC0 for ; Wed, 29 Mar 2023 07:15:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1680099291; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=vWPvILWC7NBdevnbDDsys9XJnr3/cfzKJoNpaM2CnAc=; b=FSI+KyXh+2/YdW6/xxN7eVFCkMQANmgjZXHTwByL76B37RT5IZckHDYMGvBbemr/Av/bcI 1RARGV8IIwGWmPsl3UZpqTOTkGP0HkxG9q9Qe1YDEqolAGnDrhF9U2RltVeblcXqm+BCZQ iKN2aHNpOFJUjGVeYHj4D6LTwkWizwk= 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-612-2VMedOL2PkqYySq_Hlwhxg-1; Wed, 29 Mar 2023 10:14:47 -0400 X-MC-Unique: 2VMedOL2PkqYySq_Hlwhxg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 76C28185A7A9; Wed, 29 Mar 2023 14:14:46 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.33.36.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8174D2166B33; Wed, 29 Mar 2023 14:14:44 +0000 (UTC) From: David Howells To: Matthew Wilcox , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: David Howells , Al Viro , Christoph Hellwig , Jens Axboe , Jeff Layton , Christian Brauner , Chuck Lever III , Linus Torvalds , netdev@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Willem de Bruijn Subject: [RFC PATCH v2 17/48] ip, udp: Make sendmsg(MSG_SPLICE_PAGES) copy unspliceable data Date: Wed, 29 Mar 2023 15:13:23 +0100 Message-Id: <20230329141354.516864-18-dhowells@redhat.com> In-Reply-To: <20230329141354.516864-1-dhowells@redhat.com> References: <20230329141354.516864-1-dhowells@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org If sendmsg() with MSG_SPLICE_PAGES encounters a page that shouldn't be spliced - a slab page, for instance, or one with a zero count - make __ip_append_data() copy it. Signed-off-by: David Howells cc: Willem de Bruijn cc: "David S. Miller" cc: Eric Dumazet cc: Jakub Kicinski cc: Paolo Abeni cc: Jens Axboe cc: Matthew Wilcox cc: netdev@vger.kernel.org --- net/ipv4/ip_output.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index 07736da70eab..e4aeaab704c8 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -1263,6 +1263,7 @@ static int __ip_append_data(struct sock *sk, struct msghdr *msg = from; struct page *page = NULL, **pages = &page; size_t off; + bool put = false; copy = iov_iter_extract_pages(&msg->msg_iter, &pages, copy, 1, 0, &off); @@ -1271,7 +1272,25 @@ static int __ip_append_data(struct sock *sk, goto error; } + if (!sendpage_ok(page)) { + const void *p = kmap_local_page(page); + void *q; + + q = page_frag_memdup(NULL, p + off, copy, + sk->sk_allocation, ULONG_MAX); + kunmap_local(p); + if (!q) { + err = copy ?: -ENOMEM; + goto error; + } + page = virt_to_page(q); + off = offset_in_page(q); + put = true; + } + err = skb_append_pagefrags(skb, page, off, copy); + if (put) + put_page(page); if (err < 0) goto error;