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authorSteffen Hurrle <steffen@hurrle.net>2014-01-17 22:53:15 +0100
committerDavid S. Miller <davem@davemloft.net>2014-01-19 08:04:16 +0100
commit342dfc306fb32155314dad277f3c3686b83fb9f1 (patch)
treea0d220f9310725c72bac70945261c9282e7cf305 /net/ipv6
parentnet: introduce SO_BPF_EXTENSIONS (diff)
downloadlinux-342dfc306fb32155314dad277f3c3686b83fb9f1.tar.xz
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/ipv6')
-rw-r--r--net/ipv6/datagram.c6
-rw-r--r--net/ipv6/ping.c2
-rw-r--r--net/ipv6/raw.c4
-rw-r--r--net/ipv6/udp.c6
4 files changed, 7 insertions, 11 deletions
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;