From patchwork Fri Jun 19 14:32:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 224176 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E2338C433E0 for ; Fri, 19 Jun 2020 15:01:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BF559206DB for ; Fri, 19 Jun 2020 15:01:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592578879; bh=roViRovz+ySXxtyVFp7quuCERrlKwSGt4JrFFfEiK+Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=zPUyEMV5RWc/dPivkUGS6lYHs7aogc+8MJYOap3c4p6PrLEPNdoPwZMXu4+Fs6t8t Je8FlbqkeDLNP/bj7cEn2OljB8yZuCBzs4aQJonep5lSH1vqWw/N+x6OItzH4a4nZT WmUWn4SrpzKbUTPwNZ3P3EzEkGaWR5Y9ZPtAKzio= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388466AbgFSPBO (ORCPT ); Fri, 19 Jun 2020 11:01:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:57632 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390685AbgFSPBL (ORCPT ); Fri, 19 Jun 2020 11:01:11 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id EDFFF218AC; Fri, 19 Jun 2020 15:01:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592578871; bh=roViRovz+ySXxtyVFp7quuCERrlKwSGt4JrFFfEiK+Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=d3bSpIiPmjA8QyRMPvtgRsGUNXM36+v3nZki3AkQEOooHseUSa58M0+s1rm6LZDZx +KHq5fpqLVNUGG7W7v3HPDOuqdLJedsrcEUmImOPxvGgx/8UHIiZVs2z9lzQ08sZ9O 5oPheu8bcRAM/K2TD8IF3y3+RVxjEYkuaefx79lI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mao Wenan , Jesper Dangaard Brouer , Alexei Starovoitov , Toshiaki Makita , =?utf-8?q?Toke_H?= =?utf-8?b?w7hpbGFuZC1Kw7hyZ2Vuc2Vu?= , Sasha Levin Subject: [PATCH 4.19 159/267] veth: Adjust hard_start offset on redirect XDP frames Date: Fri, 19 Jun 2020 16:32:24 +0200 Message-Id: <20200619141656.438501327@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200619141648.840376470@linuxfoundation.org> References: <20200619141648.840376470@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jesper Dangaard Brouer [ Upstream commit 5c8572251fabc5bb49fd623c064e95a9daf6a3e3 ] When native XDP redirect into a veth device, the frame arrives in the xdp_frame structure. It is then processed in veth_xdp_rcv_one(), which can run a new XDP bpf_prog on the packet. Doing so requires converting xdp_frame to xdp_buff, but the tricky part is that xdp_frame memory area is located in the top (data_hard_start) memory area that xdp_buff will point into. The current code tried to protect the xdp_frame area, by assigning xdp_buff.data_hard_start past this memory. This results in 32 bytes less headroom to expand into via BPF-helper bpf_xdp_adjust_head(). This protect step is actually not needed, because BPF-helper bpf_xdp_adjust_head() already reserve this area, and don't allow BPF-prog to expand into it. Thus, it is safe to point data_hard_start directly at xdp_frame memory area. Fixes: 9fc8d518d9d5 ("veth: Handle xdp_frames in xdp napi ring") Reported-by: Mao Wenan Signed-off-by: Jesper Dangaard Brouer Signed-off-by: Alexei Starovoitov Acked-by: Toshiaki Makita Acked-by: Toke Høiland-Jørgensen Link: https://lore.kernel.org/bpf/158945338331.97035.5923525383710752178.stgit@firesoul Signed-off-by: Sasha Levin --- drivers/net/veth.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/veth.c b/drivers/net/veth.c index 41a00cd76955..2abbad1abaf2 100644 --- a/drivers/net/veth.c +++ b/drivers/net/veth.c @@ -377,13 +377,15 @@ static struct sk_buff *veth_xdp_rcv_one(struct veth_rq *rq, unsigned int *xdp_xmit) { void *hard_start = frame->data - frame->headroom; - void *head = hard_start - sizeof(struct xdp_frame); int len = frame->len, delta = 0; struct xdp_frame orig_frame; struct bpf_prog *xdp_prog; unsigned int headroom; struct sk_buff *skb; + /* bpf_xdp_adjust_head() assures BPF cannot access xdp_frame area */ + hard_start -= sizeof(struct xdp_frame); + rcu_read_lock(); xdp_prog = rcu_dereference(rq->xdp_prog); if (likely(xdp_prog)) { @@ -405,7 +407,6 @@ static struct sk_buff *veth_xdp_rcv_one(struct veth_rq *rq, break; case XDP_TX: orig_frame = *frame; - xdp.data_hard_start = head; xdp.rxq->mem = frame->mem; if (unlikely(veth_xdp_tx(rq->dev, &xdp) < 0)) { trace_xdp_exception(rq->dev, xdp_prog, act); @@ -417,7 +418,6 @@ static struct sk_buff *veth_xdp_rcv_one(struct veth_rq *rq, goto xdp_xmit; case XDP_REDIRECT: orig_frame = *frame; - xdp.data_hard_start = head; xdp.rxq->mem = frame->mem; if (xdp_do_redirect(rq->dev, &xdp, xdp_prog)) { frame = &orig_frame; @@ -437,7 +437,7 @@ static struct sk_buff *veth_xdp_rcv_one(struct veth_rq *rq, rcu_read_unlock(); headroom = sizeof(struct xdp_frame) + frame->headroom - delta; - skb = veth_build_skb(head, headroom, len, 0); + skb = veth_build_skb(hard_start, headroom, len, 0); if (!skb) { xdp_return_frame(frame); goto err;