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| author | Steffen Hurrle <steffen@hurrle.net> | 2014-01-17 22:53:15 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-01-18 23:04:16 -0800 |
| commit | 342dfc306fb32155314dad277f3c3686b83fb9f1 (patch) | |
| tree | a0d220f9310725c72bac70945261c9282e7cf305 /net/phonet | |
| parent | ea02f9411d9faa3553ed09ce0ec9f00ceae9885e (diff) | |
| download | lwn-342dfc306fb32155314dad277f3c3686b83fb9f1.tar.gz lwn-342dfc306fb32155314dad277f3c3686b83fb9f1.zip | |
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>
Diffstat (limited to 'net/phonet')
| -rw-r--r-- | net/phonet/datagram.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/phonet/datagram.c b/net/phonet/datagram.c index 38946b26e471..290352c0e6b4 100644 --- a/net/phonet/datagram.c +++ b/net/phonet/datagram.c @@ -86,7 +86,7 @@ static int pn_init(struct sock *sk) static int pn_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t len) { - struct sockaddr_pn *target; + DECLARE_SOCKADDR(struct sockaddr_pn *, target, msg->msg_name); struct sk_buff *skb; int err; @@ -94,13 +94,12 @@ static int pn_sendmsg(struct kiocb *iocb, struct sock *sk, MSG_CMSG_COMPAT)) return -EOPNOTSUPP; - if (msg->msg_name == NULL) + if (target == NULL) return -EDESTADDRREQ; if (msg->msg_namelen < sizeof(struct sockaddr_pn)) return -EINVAL; - target = (struct sockaddr_pn *)msg->msg_name; if (target->spn_family != AF_PHONET) return -EAFNOSUPPORT; @@ -160,6 +159,7 @@ static int pn_recvmsg(struct kiocb *iocb, struct sock *sk, rval = (flags & MSG_TRUNC) ? skb->len : copylen; if (msg->msg_name != NULL) { + __sockaddr_check_size(sizeof(sa)); memcpy(msg->msg_name, &sa, sizeof(sa)); *addr_len = sizeof(sa); } |