inet: fix addr_len/msg->msg_namelen assignment in recv_error and rxpmtu functions

[ Upstream commit 85fbaa75037d0b6b786ff18658ddf0b4014ce2a4 ]

Commit bceaa90240b6019ed73b49965eac7d167610be69 ("inet: prevent leakage
of uninitialized memory to user in recv syscalls") conditionally updated
addr_len if the msg_name is written to. The recv_error and rxpmtu
functions relied on the recvmsg functions to set up addr_len before.

As this does not happen any more we have to pass addr_len to those
functions as well and set it to the size of the corresponding sockaddr
length.

This broke traceroute and such.

Fixes: bceaa90240b6 ("inet: prevent leakage of uninitialized memory to user in recv syscalls")
Reported-by: Brad Spengler <spender@grsecurity.net>
Reported-by: Tom Labanowski
Cc: mpb <mpb.mail@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/include/net/ip.h b/include/net/ip.h
index a7d4675abaa957942e05e80b7548fbfcd79a7cd7..e6860b1f1cd8aa962df568bf70e6e29269399b07 100644 (file)
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -391,7 +391,7 @@ extern int  compat_ip_getsockopt(struct sock *sk, int level,
                        int optname, char __user *optval, int __user *optlen);
 extern int     ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
 
-extern int     ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
+extern int     ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
 extern void    ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 
                              __be16 port, u32 info, u8 *payload);
 extern void    ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 52d86dabefa0e819e128ca8ab4f10320cefdccc2..cf928c42e18e1662a511aa88bedaf85817317ad5 100644 (file)
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -567,7 +567,8 @@ extern int                  compat_ipv6_getsockopt(struct sock *sk,
 extern int                     ip6_datagram_connect(struct sock *sk, 
                                                     struct sockaddr *addr, int addr_len);
 
-extern int                     ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
+extern int                     ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
+                                               int *addr_len);
 extern void                    ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
                                                u32 info, u8 *payload);
 extern void                    ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 099e6c343c73ce92262ad1fd2d8fe7d728cf323f..d5a179b9778dad77c05b6aee6cc1b1b9ca72c1f3 100644 (file)
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -356,7 +356,7 @@ void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 inf
 /*
  *     Handle MSG_ERRQUEUE
  */
-int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
+int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
 {
        struct sock_exterr_skb *serr;
        struct sk_buff *skb, *skb2;
@@ -393,6 +393,7 @@ int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
                                                   serr->addr_offset);
                sin->sin_port = serr->port;
                memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
+               *addr_len = sizeof(*sin);
        }
 
        memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));

diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index c50344b5fda47b84d979cc2d56910b0b74b6edca..8065efa913c87008dae9308e5f6fbb05e53c0086 100644 (file)
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -682,7 +682,7 @@ static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
                goto out;
 
        if (flags & MSG_ERRQUEUE) {
-               err = ip_recv_error(sk, msg, len);
+               err = ip_recv_error(sk, msg, len, addr_len);
                goto out;
        }
 

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 80487ee8c488f1b79a5de7dc3171737f105c98f0..a9aed7e4fd0ca3c80fa1b96ded4df1b48f2f7713 100644 (file)
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -942,7 +942,7 @@ int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
        int is_udplite = IS_UDPLITE(sk);
 
        if (flags & MSG_ERRQUEUE)
-               return ip_recv_error(sk, msg, len);
+               return ip_recv_error(sk, msg, len, addr_len);
 
 try_again:
        skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),

diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index e2bdc6d83a43364dbc0989c22eed43b13c88750f..ef6436d93d10f07b44f0a8d3f4ff71bed0a16354 100644 (file)
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -281,7 +281,7 @@ void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
 /*
  *     Handle MSG_ERRQUEUE
  */
-int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
+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;
@@ -333,6 +333,7 @@ int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
                                      htonl(0xffff),
                                      *(__be32 *)(nh + serr->addr_offset));
                }
+               *addr_len = sizeof(*sin);
        }
 
        memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));

diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index df75f9475eb4cdc72231be21b4847088bc9d143b..d5b09c7ca4020ff4109eb3412c7170ad90c6096b 100644 (file)
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -457,7 +457,7 @@ static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
                return -EOPNOTSUPP;
 
        if (flags & MSG_ERRQUEUE)
-               return ipv6_recv_error(sk, msg, len);
+               return ipv6_recv_error(sk, msg, len, addr_len);
 
        skb = skb_recv_datagram(sk, flags, noblock, &err);
        if (!skb)

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index ce291af0f95d1bda9da54b8ba286a08d2ab5d78f..3a9185909a463ac7d0e5d776f815cd2aff6ac397 100644 (file)
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -201,7 +201,7 @@ int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
        int is_udp4;
 
        if (flags & MSG_ERRQUEUE)
-               return ipv6_recv_error(sk, msg, len);
+               return ipv6_recv_error(sk, msg, len, addr_len);
 
 try_again:
        skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),