inet: prevent leakage of uninitialized memory to user in recv syscalls

[ Upstream commit bceaa90240b6019ed73b49965eac7d167610be69 ]

Only update *addr_len when we actually fill in sockaddr, otherwise we
can return uninitialized memory from the stack to the caller in the
recvfrom, recvmmsg and recvmsg syscalls. Drop the the (addr_len == NULL)
checks because we only get called with a valid addr_len pointer either
from sock_common_recvmsg or inet_recvmsg.

If a blocking read waits on a socket which is concurrently shut down we
now return zero and set msg_msgnamelen to 0.

Reported-by: mpb <mpb.mail@gmail.com>
Suggested-by: 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index c234bda..79d683d 100644 (file)
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -624,7 +624,6 @@ static int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
                        size_t len, int noblock, int flags, int *addr_len)
 {
        struct inet_sock *isk = inet_sk(sk);
-       struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
        struct sk_buff *skb;
        int copied, err;
 
@@ -634,9 +633,6 @@ static int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
        if (flags & MSG_OOB)
                goto out;
 
-       if (addr_len)
-               *addr_len = sizeof(*sin);
-
        if (flags & MSG_ERRQUEUE)
                return ip_recv_error(sk, msg, len);
 
@@ -658,11 +654,14 @@ static int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
        sock_recv_timestamp(msg, sk, skb);
 
        /* Copy the address. */
-       if (sin) {
+       if (msg->msg_name) {
+               struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
+
                sin->sin_family = AF_INET;
                sin->sin_port = 0 /* skb->h.uh->source */;
                sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
                memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
+               *addr_len = sizeof(*sin);
        }
        if (isk->cmsg_flags)
                ip_cmsg_recv(msg, skb);

diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index c6b9ca6..40ff8d8 100644 (file)
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -688,9 +688,6 @@ static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
        if (flags & MSG_OOB)
                goto out;
 
-       if (addr_len)
-               *addr_len = sizeof(*sin);
-
        if (flags & MSG_ERRQUEUE) {
                err = ip_recv_error(sk, msg, len);
                goto out;
@@ -718,6 +715,7 @@ static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
                sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
                sin->sin_port = 0;
                memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
+               *addr_len = sizeof(*sin);
        }
        if (inet->cmsg_flags)
                ip_cmsg_recv(msg, skb);

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 0b6136d..090452a 100644 (file)
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1174,12 +1174,6 @@ int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
        int is_udplite = IS_UDPLITE(sk);
        bool slow;
 
-       /*
-        *      Check any passed addresses
-        */
-       if (addr_len)
-               *addr_len = sizeof(*sin);
-
        if (flags & MSG_ERRQUEUE)
                return ip_recv_error(sk, msg, len);
 
@@ -1234,6 +1228,7 @@ try_again:
                sin->sin_port = udp_hdr(skb)->source;
                sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
                memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
+               *addr_len = sizeof(*sin);
        }
        if (inet->cmsg_flags)
                ip_cmsg_recv(msg, skb);

diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 3ee2870..b7d2b30 100644 (file)
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -457,9 +457,6 @@ static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
        if (flags & MSG_OOB)
                return -EOPNOTSUPP;
 
-       if (addr_len)
-               *addr_len=sizeof(*sin6);
-
        if (flags & MSG_ERRQUEUE)
                return ipv6_recv_error(sk, msg, len);
 
@@ -499,6 +496,7 @@ static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
                sin6->sin6_scope_id = 0;
                if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
                        sin6->sin6_scope_id = IP6CB(skb)->iif;
+               *addr_len = sizeof(*sin6);
        }
 
        sock_recv_ts_and_drops(msg, sk, skb);

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index f79bfdb..3215075 100644 (file)
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -348,9 +348,6 @@ int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
        int is_udp4;
        bool slow;
 
-       if (addr_len)
-               *addr_len=sizeof(struct sockaddr_in6);
-
        if (flags & MSG_ERRQUEUE)
                return ipv6_recv_error(sk, msg, len);
 
@@ -423,7 +420,7 @@ try_again:
                        if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
                                sin6->sin6_scope_id = IP6CB(skb)->iif;
                }
-
+               *addr_len = sizeof(*sin6);
        }
        if (is_udp4) {
                if (inet->cmsg_flags)

diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c
index b1d4370..ea24760 100644 (file)
--- a/net/l2tp/l2tp_ip.c
+++ b/net/l2tp/l2tp_ip.c
@@ -569,9 +569,6 @@ static int l2tp_ip_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *m
        if (flags & MSG_OOB)
                goto out;
 
-       if (addr_len)
-               *addr_len = sizeof(*sin);
-
        skb = skb_recv_datagram(sk, flags, noblock, &err);
        if (!skb)
                goto out;
@@ -594,6 +591,7 @@ static int l2tp_ip_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *m
                sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
                sin->sin_port = 0;
                memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
+               *addr_len = sizeof(*sin);
        }
        if (inet->cmsg_flags)
                ip_cmsg_recv(msg, skb);

diff --git a/net/phonet/datagram.c b/net/phonet/datagram.c
index bf35b4e..b25f2d3 100644 (file)
--- a/net/phonet/datagram.c
+++ b/net/phonet/datagram.c
@@ -139,9 +139,6 @@ static int pn_recvmsg(struct kiocb *iocb, struct sock *sk,
                        MSG_CMSG_COMPAT))
                goto out_nofree;
 
-       if (addr_len)
-               *addr_len = sizeof(sa);
-
        skb = skb_recv_datagram(sk, flags, noblock, &rval);
        if (skb == NULL)
                goto out_nofree;
@@ -162,8 +159,10 @@ static int pn_recvmsg(struct kiocb *iocb, struct sock *sk,
 
        rval = (flags & MSG_TRUNC) ? skb->len : copylen;
 
-       if (msg->msg_name != NULL)
-               memcpy(msg->msg_name, &sa, sizeof(struct sockaddr_pn));
+       if (msg->msg_name != NULL) {
+               memcpy(msg->msg_name, &sa, sizeof(sa));
+               *addr_len = sizeof(sa);
+       }
 
 out:
        skb_free_datagram(sk, skb);