Andy Lutomirski
2016-Dec-06 02:10 UTC
[PATCH] virtio-net: Fix DMA-from-the-stack in virtnet_set_mac_address()
With CONFIG_VMAP_STACK=y, virtnet_set_mac_address() can be passed a
pointer to the stack and it will OOPS. Copy the address to the heap
to prevent the crash.
Cc: Michael S. Tsirkin <mst at redhat.com>
Cc: Jason Wang <jasowang at redhat.com>
Cc: Laura Abbott <labbott at redhat.com>
Reported-by: zbyszek at in.waw.pl
Signed-off-by: Andy Lutomirski <luto at kernel.org>
---
Very lightly tested.
drivers/net/virtio_net.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 7276d5a95bd0..cbf1c613c67a 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -969,12 +969,17 @@ static int virtnet_set_mac_address(struct net_device *dev,
void *p)
struct virtnet_info *vi = netdev_priv(dev);
struct virtio_device *vdev = vi->vdev;
int ret;
- struct sockaddr *addr = p;
+ struct sockaddr *addr;
struct scatterlist sg;
- ret = eth_prepare_mac_addr_change(dev, p);
+ addr = kmalloc(sizeof(*addr), GFP_KERNEL);
+ if (!addr)
+ return -ENOMEM;
+ memcpy(addr, p, sizeof(*addr));
+
+ ret = eth_prepare_mac_addr_change(dev, addr);
if (ret)
- return ret;
+ goto out;
if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
sg_init_one(&sg, addr->sa_data, dev->addr_len);
@@ -982,7 +987,8 @@ static int virtnet_set_mac_address(struct net_device *dev,
void *p)
VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
dev_warn(&vdev->dev,
"Failed to set mac address by vq command.\n");
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
} else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
!virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
@@ -996,8 +1002,11 @@ static int virtnet_set_mac_address(struct net_device *dev,
void *p)
}
eth_commit_mac_addr_change(dev, p);
+ ret = 0;
- return 0;
+out:
+ kfree(addr);
+ return ret;
}
static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
--
2.9.3
Jason Wang
2016-Dec-06 02:30 UTC
[PATCH] virtio-net: Fix DMA-from-the-stack in virtnet_set_mac_address()
On 2016?12?06? 10:10, Andy Lutomirski wrote:> With CONFIG_VMAP_STACK=y, virtnet_set_mac_address() can be passed a > pointer to the stack and it will OOPS. Copy the address to the heap > to prevent the crash. > > Cc: Michael S. Tsirkin <mst at redhat.com> > Cc: Jason Wang <jasowang at redhat.com> > Cc: Laura Abbott <labbott at redhat.com> > Reported-by: zbyszek at in.waw.pl > Signed-off-by: Andy Lutomirski <luto at kernel.org> > --- > > Very lightly tested. > > drivers/net/virtio_net.c | 19 ++++++++++++++----- > 1 file changed, 14 insertions(+), 5 deletions(-) > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > index 7276d5a95bd0..cbf1c613c67a 100644 > --- a/drivers/net/virtio_net.c > +++ b/drivers/net/virtio_net.c > @@ -969,12 +969,17 @@ static int virtnet_set_mac_address(struct net_device *dev, void *p) > struct virtnet_info *vi = netdev_priv(dev); > struct virtio_device *vdev = vi->vdev; > int ret; > - struct sockaddr *addr = p; > + struct sockaddr *addr; > struct scatterlist sg; > > - ret = eth_prepare_mac_addr_change(dev, p); > + addr = kmalloc(sizeof(*addr), GFP_KERNEL); > + if (!addr) > + return -ENOMEM; > + memcpy(addr, p, sizeof(*addr)); > + > + ret = eth_prepare_mac_addr_change(dev, addr); > if (ret) > - return ret; > + goto out; > > if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { > sg_init_one(&sg, addr->sa_data, dev->addr_len); > @@ -982,7 +987,8 @@ static int virtnet_set_mac_address(struct net_device *dev, void *p) > VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { > dev_warn(&vdev->dev, > "Failed to set mac address by vq command.\n"); > - return -EINVAL; > + ret = -EINVAL; > + goto out; > } > } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && > !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { > @@ -996,8 +1002,11 @@ static int virtnet_set_mac_address(struct net_device *dev, void *p) > } > > eth_commit_mac_addr_change(dev, p); > + ret = 0; > > - return 0; > +out: > + kfree(addr); > + return ret; > } > > static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,Acked-by: Jason Wang <jasowang at redhat.com>
Michael S. Tsirkin
2016-Dec-06 03:00 UTC
[PATCH] virtio-net: Fix DMA-from-the-stack in virtnet_set_mac_address()
On Mon, Dec 05, 2016 at 06:10:58PM -0800, Andy Lutomirski wrote:> With CONFIG_VMAP_STACK=y, virtnet_set_mac_address() can be passed a > pointer to the stack and it will OOPS. Copy the address to the heap > to prevent the crash. > > Cc: Michael S. Tsirkin <mst at redhat.com> > Cc: Jason Wang <jasowang at redhat.com> > Cc: Laura Abbott <labbott at redhat.com> > Reported-by: zbyszek at in.waw.pl > Signed-off-by: Andy Lutomirski <luto at kernel.org>Acked-by: Michael S. Tsirkin <mst at redhat.com>> --- > > Very lightly tested. > > drivers/net/virtio_net.c | 19 ++++++++++++++----- > 1 file changed, 14 insertions(+), 5 deletions(-) > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > index 7276d5a95bd0..cbf1c613c67a 100644 > --- a/drivers/net/virtio_net.c > +++ b/drivers/net/virtio_net.c > @@ -969,12 +969,17 @@ static int virtnet_set_mac_address(struct net_device *dev, void *p) > struct virtnet_info *vi = netdev_priv(dev); > struct virtio_device *vdev = vi->vdev; > int ret; > - struct sockaddr *addr = p; > + struct sockaddr *addr; > struct scatterlist sg; > > - ret = eth_prepare_mac_addr_change(dev, p); > + addr = kmalloc(sizeof(*addr), GFP_KERNEL); > + if (!addr) > + return -ENOMEM; > + memcpy(addr, p, sizeof(*addr)); > + > + ret = eth_prepare_mac_addr_change(dev, addr); > if (ret) > - return ret; > + goto out; > > if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { > sg_init_one(&sg, addr->sa_data, dev->addr_len); > @@ -982,7 +987,8 @@ static int virtnet_set_mac_address(struct net_device *dev, void *p) > VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { > dev_warn(&vdev->dev, > "Failed to set mac address by vq command.\n"); > - return -EINVAL; > + ret = -EINVAL; > + goto out; > } > } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && > !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { > @@ -996,8 +1002,11 @@ static int virtnet_set_mac_address(struct net_device *dev, void *p) > } > > eth_commit_mac_addr_change(dev, p); > + ret = 0; > > - return 0; > +out: > + kfree(addr); > + return ret; > } > > static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, > -- > 2.9.3
David Miller
2016-Dec-06 16:39 UTC
[PATCH] virtio-net: Fix DMA-from-the-stack in virtnet_set_mac_address()
From: Andy Lutomirski <luto at kernel.org> Date: Mon, 5 Dec 2016 18:10:58 -0800> With CONFIG_VMAP_STACK=y, virtnet_set_mac_address() can be passed a > pointer to the stack and it will OOPS. Copy the address to the heap > to prevent the crash. > > Cc: Michael S. Tsirkin <mst at redhat.com> > Cc: Jason Wang <jasowang at redhat.com> > Cc: Laura Abbott <labbott at redhat.com> > Reported-by: zbyszek at in.waw.pl > Signed-off-by: Andy Lutomirski <luto at kernel.org>Applied, thanks.
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