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net: add build-time checks for msg->msg_name size

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This is a follow-up patch to f3d3342602 ("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 <[email protected]>
Suggested-by: Hannes Frederic Sowa <[email protected]>
Acked-by: Hannes Frederic Sowa <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Steffen Hurrle 2014-01-17 22:53:15 +01:00 • committed by David S. Miller
commit 342dfc306f
34 changed files with 68 additions and 78 deletions
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2
net/bluetooth/l2cap_sock.c
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@ -1413,7 +1413,7 @@ static void l2cap_sock_destruct(struct sock *sk)
static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name,
int *msg_namelen)
{
struct sockaddr_l2 *la = (struct sockaddr_l2 *) msg_name;
DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name);
memset(la, 0, sizeof(struct sockaddr_l2));
la->l2_family = AF_BLUETOOTH;