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authorMathias Krause <minipli@googlemail.com>2013-03-09 05:52:21 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-03-20 12:58:54 -0700
commit5678a7694c47188498a740ae805a8dee2fd7d178 (patch)
tree4aaf4ef2f6c9122f43a759067403eb4c53b02270
parent3385fcdbf46ec6fbbcefffd41ac10a8c4daafd32 (diff)
dcbnl: fix various netlink info leaks
[ Upstream commit 29cd8ae0e1a39e239a3a7b67da1986add1199fc0 ] The dcb netlink interface leaks stack memory in various places: * perm_addr[] buffer is only filled at max with 12 of the 32 bytes but copied completely, * no in-kernel driver fills all fields of an IEEE 802.1Qaz subcommand, so we're leaking up to 58 bytes for ieee_ets structs, up to 136 bytes for ieee_pfc structs, etc., * the same is true for CEE -- no in-kernel driver fills the whole struct, Prevent all of the above stack info leaks by properly initializing the buffers/structures involved. 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>
-rw-r--r--net/dcb/dcbnl.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
index ed1bb8c65a9e..d8f262fa7120 100644
--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -335,6 +335,7 @@ static int dcbnl_getperm_hwaddr(struct net_device *netdev, struct nlattr **tb,
dcb->dcb_family = AF_UNSPEC;
dcb->cmd = DCB_CMD_GPERM_HWADDR;
+ memset(perm_addr, 0, sizeof(perm_addr));
netdev->dcbnl_ops->getpermhwaddr(netdev, perm_addr);
ret = nla_put(dcbnl_skb, DCB_ATTR_PERM_HWADDR, sizeof(perm_addr),
@@ -1311,6 +1312,7 @@ static int dcbnl_ieee_get(struct net_device *netdev, struct nlattr **tb,
if (ops->ieee_getets) {
struct ieee_ets ets;
+ memset(&ets, 0, sizeof(ets));
err = ops->ieee_getets(netdev, &ets);
if (!err)
NLA_PUT(skb, DCB_ATTR_IEEE_ETS, sizeof(ets), &ets);
@@ -1318,6 +1320,7 @@ static int dcbnl_ieee_get(struct net_device *netdev, struct nlattr **tb,
if (ops->ieee_getpfc) {
struct ieee_pfc pfc;
+ memset(&pfc, 0, sizeof(pfc));
err = ops->ieee_getpfc(netdev, &pfc);
if (!err)
NLA_PUT(skb, DCB_ATTR_IEEE_PFC, sizeof(pfc), &pfc);
@@ -1344,6 +1347,7 @@ static int dcbnl_ieee_get(struct net_device *netdev, struct nlattr **tb,
/* get peer info if available */
if (ops->ieee_peer_getets) {
struct ieee_ets ets;
+ memset(&ets, 0, sizeof(ets));
err = ops->ieee_peer_getets(netdev, &ets);
if (!err)
NLA_PUT(skb, DCB_ATTR_IEEE_PEER_ETS, sizeof(ets), &ets);
@@ -1351,6 +1355,7 @@ static int dcbnl_ieee_get(struct net_device *netdev, struct nlattr **tb,
if (ops->ieee_peer_getpfc) {
struct ieee_pfc pfc;
+ memset(&pfc, 0, sizeof(pfc));
err = ops->ieee_peer_getpfc(netdev, &pfc);
if (!err)
NLA_PUT(skb, DCB_ATTR_IEEE_PEER_PFC, sizeof(pfc), &pfc);
@@ -1551,6 +1556,7 @@ static int dcbnl_cee_get(struct net_device *netdev, struct nlattr **tb,
/* get peer info if available */
if (ops->cee_peer_getpg) {
struct cee_pg pg;
+ memset(&pg, 0, sizeof(pg));
err = ops->cee_peer_getpg(netdev, &pg);
if (!err)
NLA_PUT(skb, DCB_ATTR_CEE_PEER_PG, sizeof(pg), &pg);
@@ -1558,6 +1564,7 @@ static int dcbnl_cee_get(struct net_device *netdev, struct nlattr **tb,
if (ops->cee_peer_getpfc) {
struct cee_pfc pfc;
+ memset(&pfc, 0, sizeof(pfc));
err = ops->cee_peer_getpfc(netdev, &pfc);
if (!err)
NLA_PUT(skb, DCB_ATTR_CEE_PEER_PFC, sizeof(pfc), &pfc);