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authorSteffen Hurrle <steffen@hurrle.net>2014-01-17 22:53:15 +0100
committerDavid S. Miller <davem@davemloft.net>2014-01-18 23:04:16 -0800
commit342dfc306fb32155314dad277f3c3686b83fb9f1 (patch)
treea0d220f9310725c72bac70945261c9282e7cf305 /net/packet
parentea02f9411d9faa3553ed09ce0ec9f00ceae9885e (diff)
downloadblackbird-op-linux-342dfc306fb32155314dad277f3c3686b83fb9f1.tar.gz
blackbird-op-linux-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/packet')
-rw-r--r--net/packet/af_packet.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 12f2f725a945..d711ecbbb9d3 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1584,7 +1584,7 @@ static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t len)
{
struct sock *sk = sock->sk;
- struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
+ DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name);
struct sk_buff *skb = NULL;
struct net_device *dev;
__be16 proto = 0;
@@ -2196,7 +2196,7 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
__be16 proto;
int err, reserve = 0;
void *ph;
- struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
+ DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
bool need_wait = !(msg->msg_flags & MSG_DONTWAIT);
int tp_len, size_max;
unsigned char *addr;
@@ -2346,7 +2346,7 @@ static struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,
static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
{
struct sock *sk = sock->sk;
- struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
+ DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name);
struct sk_buff *skb;
struct net_device *dev;
__be16 proto;
@@ -2922,6 +2922,7 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
* in, we fill it in now.
*/
if (sock->type == SOCK_PACKET) {
+ __sockaddr_check_size(sizeof(struct sockaddr_pkt));
msg->msg_namelen = sizeof(struct sockaddr_pkt);
} else {
struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll;
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