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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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8
net/nfc/llcp_sock.c
View file

@ -769,8 +769,8 @@ static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
lock_sock(sk);
if (sk->sk_type == SOCK_DGRAM) {
struct sockaddr_nfc_llcp *addr =
(struct sockaddr_nfc_llcp *)msg->msg_name;
DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, addr,
msg->msg_name);
if (msg->msg_namelen < sizeof(*addr)) {
release_sock(sk);
@ -842,8 +842,8 @@ static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
struct sockaddr_nfc_llcp *sockaddr =
(struct sockaddr_nfc_llcp *) msg->msg_name;
DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, sockaddr,
msg->msg_name);
msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);