From patchwork Mon Jan 24 18:34:51 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 535422 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 0D67DC2BA4C for ; Mon, 24 Jan 2022 21:38:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1455851AbiAXVgh (ORCPT ); Mon, 24 Jan 2022 16:36:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52352 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1452865AbiAXV1N (ORCPT ); Mon, 24 Jan 2022 16:27:13 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 45869C073227; Mon, 24 Jan 2022 12:18:30 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id D709660B56; Mon, 24 Jan 2022 20:18:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AD416C340E5; Mon, 24 Jan 2022 20:18:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1643055509; bh=TXWftH3Lvlt9MHh1xSd+HVBtOTeO7gkjpDkzqXx25Ww=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=voiHKdiH30jYYYB/lnu1CUf+MWLedmZVqJnsdI9if0Ttyz5Qses8tGGYUfTHE4f9/ ysflh+muvc8pXKsflyEo7L0N9BrGc4SNWk8+eLz1AjTpJEtI4SkvKf4l4+w8JxaE0f UMCiafFYj/X80WoblbLM7lvU1F/SZqOscBapbcA0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jesper Dangaard Brouer , Nechama Kraus , Maciej Fijalkowski , Tony Nguyen , Sasha Levin Subject: [PATCH 5.15 174/846] igc: AF_XDP zero-copy metadata adjust breaks SKBs on XDP_PASS Date: Mon, 24 Jan 2022 19:34:51 +0100 Message-Id: <20220124184106.979687442@linuxfoundation.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220124184100.867127425@linuxfoundation.org> References: <20220124184100.867127425@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jesper Dangaard Brouer [ Upstream commit 4fa8fcd3440101dbacf4fae91de69877ef751977 ] Driver already implicitly supports XDP metadata access in AF_XDP zero-copy mode, as xsk_buff_pool's xp_alloc() naturally set xdp_buff data_meta equal data. This works fine for XDP and AF_XDP, but if a BPF-prog adjust via bpf_xdp_adjust_meta() and choose to call XDP_PASS, then igc function igc_construct_skb_zc() will construct an invalid SKB packet. The function correctly include the xdp->data_meta area in the memcpy, but forgot to pull header to take metasize into account. Fixes: fc9df2a0b520 ("igc: Enable RX via AF_XDP zero-copy") Signed-off-by: Jesper Dangaard Brouer Tested-by: Nechama Kraus Acked-by: Maciej Fijalkowski Signed-off-by: Tony Nguyen Signed-off-by: Sasha Levin --- drivers/net/ethernet/intel/igc/igc_main.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c index 0a96627391a8c..c7fa978cdf02e 100644 --- a/drivers/net/ethernet/intel/igc/igc_main.c +++ b/drivers/net/ethernet/intel/igc/igc_main.c @@ -2447,8 +2447,10 @@ static struct sk_buff *igc_construct_skb_zc(struct igc_ring *ring, skb_reserve(skb, xdp->data_meta - xdp->data_hard_start); memcpy(__skb_put(skb, totalsize), xdp->data_meta, totalsize); - if (metasize) + if (metasize) { skb_metadata_set(skb, metasize); + __skb_pull(skb, metasize); + } return skb; }