User space is currently sending a OVS_FLOW_ATTR_PROBE for both flow
and packet messages. This leads to an out-of-bounds access in
ovs_packet_cmd_execute() because OVS_FLOW_ATTR_PROBE >
OVS_PACKET_ATTR_MAX.
Introduce a new OVS_PACKET_ATTR_PROBE with the same numeric value
as OVS_FLOW_ATTR_PROBE to grow the range of accepted packet attributes
while maintaining binary compatibility with existing OVS binaries.
Fixes: 9233ce ("datapath: Add support for OVS_FLOW_ATTR_PROBE.")
Reported-by: Sander Eikelenboom <[email protected]>
Signed-off-by: Thomas Graf <[email protected]>
---
AUTHORS | 1 +
datapath/datapath.c | 3 ++-
datapath/linux/compat/include/linux/openvswitch.h | 4 ++++
lib/dpif-netlink.c | 2 +-
4 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/AUTHORS b/AUTHORS
index 3356ee8..ab82e24 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -301,6 +301,7 @@ Roger Leigh [email protected]
Rogério Vinhal Nunes
Roman Sokolkov [email protected]
Ronaldo A. Ferreira [email protected]
+Sander Eikelenboom [email protected]
Saul St. John [email protected]
Scott Hendricks [email protected]
Sean Brady [email protected]
diff --git a/datapath/datapath.c b/datapath/datapath.c
index de912f6..c562e89 100644
--- a/datapath/datapath.c
+++ b/datapath/datapath.c
@@ -531,7 +531,7 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb,
struct genl_info *info)
struct vport *input_vport;
int len;
int err;
- bool log = !a[OVS_FLOW_ATTR_PROBE];
+ bool log = !a[OVS_PACKET_ATTR_PROBE];
err = -EINVAL;
if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
@@ -618,6 +618,7 @@ static const struct nla_policy
packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
[OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
[OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
[OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
+ [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
};
static struct genl_ops dp_packet_genl_ops[] = {
diff --git a/datapath/linux/compat/include/linux/openvswitch.h
b/datapath/linux/compat/include/linux/openvswitch.h
index 67715f8..a59e109 100644
--- a/datapath/linux/compat/include/linux/openvswitch.h
+++ b/datapath/linux/compat/include/linux/openvswitch.h
@@ -197,6 +197,10 @@ enum ovs_packet_attr {
OVS_PACKET_ATTR_USERDATA, /* OVS_ACTION_ATTR_USERSPACE arg. */
OVS_PACKET_ATTR_EGRESS_TUN_KEY, /* Nested OVS_TUNNEL_KEY_ATTR_*
attributes. */
+ OVS_PACKET_ATTR_UNUSED1,
+ OVS_PACKET_ATTR_UNUSED2,
+ OVS_PACKET_ATTR_PROBE, /* Packet operation is a feature probe,
+ error logging should be suppressed. */
__OVS_PACKET_ATTR_MAX
};
diff --git a/lib/dpif-netlink.c b/lib/dpif-netlink.c
index 8f0eca6..a9d60f7 100644
--- a/lib/dpif-netlink.c
+++ b/lib/dpif-netlink.c
@@ -1530,7 +1530,7 @@ dpif_netlink_encode_execute(int dp_ifindex, const struct
dpif_execute *d_exec,
nl_msg_put_unspec(buf, OVS_PACKET_ATTR_ACTIONS,
d_exec->actions, d_exec->actions_len);
if (d_exec->probe) {
- nl_msg_put_flag(buf, OVS_FLOW_ATTR_PROBE);
+ nl_msg_put_flag(buf, OVS_PACKET_ATTR_PROBE);
}
}
--
1.9.3
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