3.2-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mathias Krause <minipli@xxxxxxxxxxxxxx>
[ 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@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
net/dcb/dcbnl.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -336,6 +336,7 @@ static int dcbnl_getperm_hwaddr(struct n
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),
@@ -1238,6 +1239,7 @@ static int dcbnl_ieee_fill(struct sk_buf
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);
@@ -1245,6 +1247,7 @@ static int dcbnl_ieee_fill(struct sk_buf
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);
@@ -1277,6 +1280,7 @@ static int dcbnl_ieee_fill(struct sk_buf
/* 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);
@@ -1284,6 +1288,7 @@ static int dcbnl_ieee_fill(struct sk_buf
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);
@@ -1463,6 +1468,7 @@ static int dcbnl_cee_fill(struct sk_buff
/* 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);
@@ -1470,6 +1476,7 @@ static int dcbnl_cee_fill(struct sk_buff
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);
--
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