fe324f6990
- Fix DMA from stack in virtio-net (rhbz 1401612)
83 lines
2.6 KiB
Diff
83 lines
2.6 KiB
Diff
From patchwork Tue Dec 6 02:10:58 2016
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Content-Type: text/plain; charset="utf-8"
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MIME-Version: 1.0
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Content-Transfer-Encoding: 7bit
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Subject: virtio-net: Fix DMA-from-the-stack in virtnet_set_mac_address()
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From: Andy Lutomirski <luto@kernel.org>
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X-Patchwork-Id: 702984
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X-Patchwork-Delegate: davem@davemloft.net
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Message-Id: <fe889e578d5dffa9ae0834b449a35fcfd1e10694.1480990173.git.luto@kernel.org>
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To: netdev@vger.kernel.org
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Cc: linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org,
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Andy Lutomirski <luto@kernel.org>,
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"Michael S . Tsirkin" <mst@redhat.com>, Jason Wang <jasowang@redhat.com>,
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Laura Abbott <labbott@redhat.com>
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Date: Mon, 5 Dec 2016 18:10:58 -0800
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With CONFIG_VMAP_STACK=y, virtnet_set_mac_address() can be passed a
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pointer to the stack and it will OOPS. Copy the address to the heap
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to prevent the crash.
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Cc: Michael S. Tsirkin <mst@redhat.com>
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Cc: Jason Wang <jasowang@redhat.com>
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Cc: Laura Abbott <labbott@redhat.com>
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Reported-by: zbyszek@in.waw.pl
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Signed-off-by: Andy Lutomirski <luto@kernel.org>
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Acked-by: Jason Wang <jasowang@redhat.com>
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Acked-by: Michael S. Tsirkin <mst@redhat.com>
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---
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Very lightly tested.
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drivers/net/virtio_net.c | 19 ++++++++++++++-----
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1 file changed, 14 insertions(+), 5 deletions(-)
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diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
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index 7276d5a95bd0..cbf1c613c67a 100644
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--- a/drivers/net/virtio_net.c
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+++ b/drivers/net/virtio_net.c
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@@ -969,12 +969,17 @@ static int virtnet_set_mac_address(struct net_device *dev, void *p)
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struct virtnet_info *vi = netdev_priv(dev);
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struct virtio_device *vdev = vi->vdev;
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int ret;
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- struct sockaddr *addr = p;
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+ struct sockaddr *addr;
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struct scatterlist sg;
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- ret = eth_prepare_mac_addr_change(dev, p);
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+ addr = kmalloc(sizeof(*addr), GFP_KERNEL);
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+ if (!addr)
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+ return -ENOMEM;
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+ memcpy(addr, p, sizeof(*addr));
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+
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+ ret = eth_prepare_mac_addr_change(dev, addr);
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if (ret)
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- return ret;
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+ goto out;
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if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
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sg_init_one(&sg, addr->sa_data, dev->addr_len);
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@@ -982,7 +987,8 @@ static int virtnet_set_mac_address(struct net_device *dev, void *p)
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VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
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dev_warn(&vdev->dev,
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"Failed to set mac address by vq command.\n");
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- return -EINVAL;
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+ ret = -EINVAL;
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+ goto out;
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}
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} else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
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!virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
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@@ -996,8 +1002,11 @@ static int virtnet_set_mac_address(struct net_device *dev, void *p)
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}
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eth_commit_mac_addr_change(dev, p);
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+ ret = 0;
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- return 0;
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+out:
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+ kfree(addr);
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+ return ret;
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}
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static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
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