[ 71/75] rtnl: fix info leak on RTM_GETLINK request for VF devices

Greg Kroah-Hartman
2013-03-18T21:47:01Z

From: Mathias Krause <minipli@googlemail.com>

[ Upstream commit 84d73cd3fb142bf1298a8c13fd4ca50fd2432372 ]

Initialize the mac address buffer with 0 as the driver specific function
will probably not fill the whole buffer. In fact, all in-kernel drivers
fill only ETH_ALEN of the MAX_ADDR_LEN bytes, i.e. 6 of the 32 possible
bytes. Therefore we currently leak 26 bytes of stack memory to userland
via the netlink interface.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/core/rtnetlink.c | 1 +
1 file changed, 1 insertion(+)

--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -976,6 +976,7 @@ static int rtnl_fill_ifinfo(struct sk_bu
* report anything.
*/
ivi.spoofchk = -1;
+ memset(ivi.mac, 0, sizeof(ivi.mac));
if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
break;
vf_mac.vf =