diff options
| author | Mathias Krause <minipli@googlemail.com> | 2013-03-09 05:52:21 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-03-20 12:58:54 -0700 |
| commit | 5678a7694c47188498a740ae805a8dee2fd7d178 (patch) | |
| tree | 4aaf4ef2f6c9122f43a759067403eb4c53b02270 | |
| parent | 3385fcdbf46ec6fbbcefffd41ac10a8c4daafd32 (diff) | |
| download | lwn-5678a7694c47188498a740ae805a8dee2fd7d178.tar.gz lwn-5678a7694c47188498a740ae805a8dee2fd7d178.zip | |
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.c | 7 |
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); |