From 342dfc306fb32155314dad277f3c3686b83fb9f1 Mon Sep 17 00:00:00 2001 From: Steffen Hurrle Date: Fri, 17 Jan 2014 22:53:15 +0100 Subject: 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 Suggested-by: Hannes Frederic Sowa Acked-by: Hannes Frederic Sowa Signed-off-by: David S. Miller --- net/ipv6/datagram.c | 6 ++---- net/ipv6/ping.c | 2 +- net/ipv6/raw.c | 4 ++-- net/ipv6/udp.c | 6 ++---- 4 files changed, 7 insertions(+), 11 deletions(-) (limited to 'net/ipv6') diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c index 6983058942ea..bce73cbd203a 100644 --- a/net/ipv6/datagram.c +++ b/net/ipv6/datagram.c @@ -322,7 +322,7 @@ int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) struct ipv6_pinfo *np = inet6_sk(sk); struct sock_exterr_skb *serr; struct sk_buff *skb, *skb2; - struct sockaddr_in6 *sin; + DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); struct { struct sock_extended_err ee; struct sockaddr_in6 offender; @@ -348,7 +348,6 @@ int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) serr = SKB_EXT_ERR(skb); - sin = (struct sockaddr_in6 *)msg->msg_name; if (sin) { const unsigned char *nh = skb_network_header(skb); sin->sin6_family = AF_INET6; @@ -429,8 +428,8 @@ int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, { struct ipv6_pinfo *np = inet6_sk(sk); struct sk_buff *skb; - struct sockaddr_in6 *sin; struct ip6_mtuinfo mtu_info; + DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); int err; int copied; @@ -452,7 +451,6 @@ int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); - sin = (struct sockaddr_in6 *)msg->msg_name; if (sin) { sin->sin6_family = AF_INET6; sin->sin6_flowinfo = 0; diff --git a/net/ipv6/ping.c b/net/ipv6/ping.c index 15d23b8c2129..cd71f3a540be 100644 --- a/net/ipv6/ping.c +++ b/net/ipv6/ping.c @@ -103,7 +103,7 @@ int ping_v6_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, return err; if (msg->msg_name) { - struct sockaddr_in6 *u = (struct sockaddr_in6 *) msg->msg_name; + DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name); if (msg->msg_namelen < sizeof(struct sockaddr_in6) || u->sin6_family != AF_INET6) { return -EINVAL; diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c index 5f10b7ea7ccc..b4523117aeae 100644 --- a/net/ipv6/raw.c +++ b/net/ipv6/raw.c @@ -457,7 +457,7 @@ static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk, int noblock, int flags, int *addr_len) { struct ipv6_pinfo *np = inet6_sk(sk); - struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name; + DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); struct sk_buff *skb; size_t copied; int err; @@ -734,7 +734,7 @@ static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t len) { struct ipv6_txoptions opt_space; - struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name; + DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); struct in6_addr *daddr, *final_p, final; struct inet_sock *inet = inet_sk(sk); struct ipv6_pinfo *np = inet6_sk(sk); diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index fa9d988f4012..233c3ab6aee4 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -460,9 +460,7 @@ try_again: /* Copy the address. */ if (msg->msg_name) { - struct sockaddr_in6 *sin6; - - sin6 = (struct sockaddr_in6 *) msg->msg_name; + DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); sin6->sin6_family = AF_INET6; sin6->sin6_port = udp_hdr(skb)->source; sin6->sin6_flowinfo = 0; @@ -1041,7 +1039,7 @@ int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, struct udp_sock *up = udp_sk(sk); struct inet_sock *inet = inet_sk(sk); struct ipv6_pinfo *np = inet6_sk(sk); - struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; + DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); struct in6_addr *daddr, *final_p, final; struct ipv6_txoptions *opt = NULL; struct ip6_flowlabel *flowlabel = NULL; -- cgit v1.2.3