Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933007AbcJLMxb (ORCPT ); Wed, 12 Oct 2016 08:53:31 -0400 Received: from mail.kernel.org ([198.145.29.136]:51108 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755443AbcJLMvo (ORCPT ); Wed, 12 Oct 2016 08:51:44 -0400 From: lizf@kernel.org To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, David Vrabel , Konrad Rzeszutek Wilk , Zefan Li Subject: [PATCH 3.4 094/125] xen-netback: use RING_COPY_REQUEST() throughout Date: Wed, 12 Oct 2016 20:33:30 +0800 Message-Id: <1476275641-4697-94-git-send-email-lizf@kernel.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1476275600-4626-1-git-send-email-lizf@kernel.org> References: <1476275600-4626-1-git-send-email-lizf@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4308 Lines: 135 From: David Vrabel 3.4.113-rc1 review patch. If anyone has any objections, please let me know. ------------------ commit 68a33bfd8403e4e22847165d149823a2e0e67c9c upstream. Instead of open-coding memcpy()s and directly accessing Tx and Rx requests, use the new RING_COPY_REQUEST() that ensures the local copy is correct. This is more than is strictly necessary for guest Rx requests since only the id and gref fields are used and it is harmless if the frontend modifies these. This is part of XSA155. Reviewed-by: Wei Liu Signed-off-by: David Vrabel Signed-off-by: Konrad Rzeszutek Wilk [lizf: Backported to 3.4: - adjust context - s/queue/vif/g] Signed-off-by: Zefan Li --- drivers/net/xen-netback/netback.c | 30 ++++++++++++++---------------- 1 file changed, 14 insertions(+), 16 deletions(-) diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c index 25d4c31..37bcc56 100644 --- a/drivers/net/xen-netback/netback.c +++ b/drivers/net/xen-netback/netback.c @@ -398,17 +398,17 @@ static struct netbk_rx_meta *get_next_rx_buffer(struct xenvif *vif, struct netrx_pending_operations *npo) { struct netbk_rx_meta *meta; - struct xen_netif_rx_request *req; + struct xen_netif_rx_request req; - req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++); + RING_COPY_REQUEST(&vif->rx, vif->rx.req_cons++, &req); meta = npo->meta + npo->meta_prod++; meta->gso_size = 0; meta->size = 0; - meta->id = req->id; + meta->id = req.id; npo->copy_off = 0; - npo->copy_gref = req->gref; + npo->copy_gref = req.gref; return meta; } @@ -510,7 +510,7 @@ static int netbk_gop_skb(struct sk_buff *skb, struct xenvif *vif = netdev_priv(skb->dev); int nr_frags = skb_shinfo(skb)->nr_frags; int i; - struct xen_netif_rx_request *req; + struct xen_netif_rx_request req; struct netbk_rx_meta *meta; unsigned char *data; int head = 1; @@ -520,14 +520,14 @@ static int netbk_gop_skb(struct sk_buff *skb, /* Set up a GSO prefix descriptor, if necessary */ if (skb_shinfo(skb)->gso_size && vif->gso_prefix) { - req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++); + RING_COPY_REQUEST(&vif->rx, vif->rx.req_cons++, &req); meta = npo->meta + npo->meta_prod++; meta->gso_size = skb_shinfo(skb)->gso_size; meta->size = 0; - meta->id = req->id; + meta->id = req.id; } - req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++); + RING_COPY_REQUEST(&vif->rx, vif->rx.req_cons++, &req); meta = npo->meta + npo->meta_prod++; if (!vif->gso_prefix) @@ -536,9 +536,9 @@ static int netbk_gop_skb(struct sk_buff *skb, meta->gso_size = 0; meta->size = 0; - meta->id = req->id; + meta->id = req.id; npo->copy_off = 0; - npo->copy_gref = req->gref; + npo->copy_gref = req.gref; data = skb->data; while (data < skb_tail_pointer(skb)) { @@ -882,7 +882,7 @@ static void netbk_tx_err(struct xenvif *vif, make_tx_response(vif, txp, XEN_NETIF_RSP_ERROR); if (cons == end) break; - txp = RING_GET_REQUEST(&vif->tx, cons++); + RING_COPY_REQUEST(&vif->tx, cons++, txp); } while (1); vif->tx.req_cons = cons; xen_netbk_check_rx_xenvif(vif); @@ -943,8 +943,7 @@ static int netbk_count_requests(struct xenvif *vif, drop_err = -E2BIG; } - memcpy(txp, RING_GET_REQUEST(&vif->tx, cons + slots), - sizeof(*txp)); + RING_COPY_REQUEST(&vif->tx, cons + slots, txp); /* If the guest submitted a frame >= 64 KiB then * first->size overflowed and following slots will @@ -1226,8 +1225,7 @@ static int xen_netbk_get_extras(struct xenvif *vif, return -EBADR; } - memcpy(&extra, RING_GET_REQUEST(&vif->tx, cons), - sizeof(extra)); + RING_COPY_REQUEST(&vif->tx, cons, &extra); if (unlikely(!extra.type || extra.type >= XEN_NETIF_EXTRA_TYPE_MAX)) { vif->tx.req_cons = ++cons; @@ -1422,7 +1420,7 @@ static unsigned xen_netbk_tx_build_gops(struct xen_netbk *netbk) idx = vif->tx.req_cons; rmb(); /* Ensure that we see the request before we copy it. */ - memcpy(&txreq, RING_GET_REQUEST(&vif->tx, idx), sizeof(txreq)); + RING_COPY_REQUEST(&vif->tx, idx, &txreq); /* Credit-based scheduling. */ if (txreq.size > vif->remaining_credit && -- 1.9.1