net: add build-time checks for msg->msg_name size
This is a follow-up patch to f3d3342602f8bc ("net: rework recvmsg
handler msg_name and msg_namelen logic").
DECLARE_SOCKADDR validates that the structure we use for writing the
name information to is not larger than the buffer which is reserved
for msg->msg_name (which is 128 bytes). Also use DECLARE_SOCKADDR
consistently in sendmsg code paths.
Signed-off-by: Steffen Hurrle <steffen@hurrle.net>
Suggested-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 81e6cfd..c04518f 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -493,7 +493,7 @@
*/
if (msg->msg_namelen) {
- struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name;
+ DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
err = -EINVAL;
if (msg->msg_namelen < sizeof(*usin))
goto out;
@@ -690,7 +690,7 @@
struct inet_sock *inet = inet_sk(sk);
size_t copied = 0;
int err = -EOPNOTSUPP;
- struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
+ DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
struct sk_buff *skb;
if (flags & MSG_OOB)