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65 lines
1.9 KiB
65 lines
1.9 KiB
From 2adc557330dde5b474d885518d2663180d3c8f45 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?=
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<marmarek@invisiblethingslab.com>
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Date: Wed, 16 Dec 2015 05:19:37 +0100
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Subject: [PATCH 10/13] xen-netfront: do not use data already exposed to
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backend
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Organization: Invisible Things Lab
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Cc: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
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Backend may freely modify anything on shared page, so use data which was
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supposed to be written there, instead of reading it back from the shared
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page.
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This is part of XSA155.
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CC: stable@vger.kernel.org
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Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
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---
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drivers/net/xen-netfront.c | 32 +++++++++++---------------------
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1 file changed, 11 insertions(+), 21 deletions(-)
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diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
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index 2af5100..959e479 100644
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--- a/drivers/net/xen-netfront.c
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+++ b/drivers/net/xen-netfront.c
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@@ -453,7 +453,7 @@ static void xennet_tx_setup_grant(unsign
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tx->flags = 0;
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info->tx = tx;
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- info->size += tx->size;
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+ info->size += len;
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}
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static struct xen_netif_tx_request *xennet_make_first_txreq(
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@@ -522,7 +524,7 @@ static int xennet_start_xmit(struct sk_b
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int slots;
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struct page *page;
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unsigned int offset;
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- unsigned int len;
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+ unsigned int len, this_len;
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unsigned long flags;
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struct netfront_queue *queue = NULL;
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unsigned int num_queues = dev->real_num_tx_queues;
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@@ -614,14 +614,15 @@ static int xennet_start_xmit(struct sk_b
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}
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/* First request for the linear area. */
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+ this_len = min_t(unsigned int, XEN_PAGE_SIZE - offset, len);
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first_tx = tx = xennet_make_first_txreq(queue, skb,
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page, offset, len);
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- offset += tx->size;
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+ offset += this_len;
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if (offset == PAGE_SIZE) {
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page++;
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offset = 0;
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}
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- len -= tx->size;
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+ len -= this_len;
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if (skb->ip_summed == CHECKSUM_PARTIAL)
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/* local packet? */
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