inet: prevent leakage of uninitialized memory to user in recv syscalls
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>
This commit is contained in:
parent
bcd081a3ae
commit
bceaa90240
8 changed files with 17 additions and 38 deletions
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@ -315,9 +315,8 @@ static int dgram_recvmsg(struct kiocb *iocb, struct sock *sk,
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if (saddr) {
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saddr->family = AF_IEEE802154;
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saddr->addr = mac_cb(skb)->sa;
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}
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if (addr_len)
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*addr_len = sizeof(*saddr);
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}
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if (flags & MSG_TRUNC)
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copied = skb->len;
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@ -830,8 +830,6 @@ int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
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{
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struct inet_sock *isk = inet_sk(sk);
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int family = sk->sk_family;
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struct sockaddr_in *sin;
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struct sockaddr_in6 *sin6;
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struct sk_buff *skb;
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int copied, err;
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@ -841,13 +839,6 @@ int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
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if (flags & MSG_OOB)
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goto out;
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if (addr_len) {
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if (family == AF_INET)
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*addr_len = sizeof(*sin);
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else if (family == AF_INET6 && addr_len)
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*addr_len = sizeof(*sin6);
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}
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if (flags & MSG_ERRQUEUE) {
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if (family == AF_INET) {
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return ip_recv_error(sk, msg, len);
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@ -877,11 +868,13 @@ int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
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/* Copy the address and add cmsg data. */
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if (family == AF_INET) {
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sin = (struct sockaddr_in *) msg->msg_name;
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struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
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sin->sin_family = AF_INET;
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sin->sin_port = 0 /* skb->h.uh->source */;
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sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
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memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
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*addr_len = sizeof(*sin);
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if (isk->cmsg_flags)
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ip_cmsg_recv(msg, skb);
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@ -890,17 +883,19 @@ int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
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} else if (family == AF_INET6) {
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct ipv6hdr *ip6 = ipv6_hdr(skb);
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sin6 = (struct sockaddr_in6 *) msg->msg_name;
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struct sockaddr_in6 *sin6 =
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(struct sockaddr_in6 *)msg->msg_name;
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sin6->sin6_family = AF_INET6;
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sin6->sin6_port = 0;
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sin6->sin6_addr = ip6->saddr;
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sin6->sin6_flowinfo = 0;
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if (np->sndflow)
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sin6->sin6_flowinfo = ip6_flowinfo(ip6);
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sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
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IP6CB(skb)->iif);
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*addr_len = sizeof(*sin6);
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if (inet6_sk(sk)->rxopt.all)
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pingv6_ops.ip6_datagram_recv_ctl(sk, msg, skb);
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@ -696,9 +696,6 @@ static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
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if (flags & MSG_OOB)
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goto out;
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if (addr_len)
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*addr_len = sizeof(*sin);
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if (flags & MSG_ERRQUEUE) {
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err = ip_recv_error(sk, msg, len);
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goto out;
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@ -726,6 +723,7 @@ static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
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sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
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sin->sin_port = 0;
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memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
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*addr_len = sizeof(*sin);
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}
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if (inet->cmsg_flags)
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ip_cmsg_recv(msg, skb);
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@ -1235,12 +1235,6 @@ int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
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int is_udplite = IS_UDPLITE(sk);
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bool slow;
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/*
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* Check any passed addresses
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*/
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if (addr_len)
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*addr_len = sizeof(*sin);
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if (flags & MSG_ERRQUEUE)
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return ip_recv_error(sk, msg, len);
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@ -1302,6 +1296,7 @@ int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
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sin->sin_port = udp_hdr(skb)->source;
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sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
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memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
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*addr_len = sizeof(*sin);
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}
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if (inet->cmsg_flags)
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ip_cmsg_recv(msg, skb);
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@ -465,9 +465,6 @@ static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
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if (flags & MSG_OOB)
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return -EOPNOTSUPP;
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if (addr_len)
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*addr_len=sizeof(*sin6);
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if (flags & MSG_ERRQUEUE)
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return ipv6_recv_error(sk, msg, len);
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@ -506,6 +503,7 @@ static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
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sin6->sin6_flowinfo = 0;
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sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
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IP6CB(skb)->iif);
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*addr_len = sizeof(*sin6);
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}
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sock_recv_ts_and_drops(msg, sk, skb);
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@ -392,9 +392,6 @@ int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
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int is_udp4;
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bool slow;
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if (addr_len)
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*addr_len = sizeof(struct sockaddr_in6);
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if (flags & MSG_ERRQUEUE)
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return ipv6_recv_error(sk, msg, len);
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@ -480,7 +477,7 @@ int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
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ipv6_iface_scope_id(&sin6->sin6_addr,
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IP6CB(skb)->iif);
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}
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*addr_len = sizeof(*sin6);
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}
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if (is_udp4) {
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if (inet->cmsg_flags)
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@ -518,9 +518,6 @@ static int l2tp_ip_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *m
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if (flags & MSG_OOB)
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goto out;
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if (addr_len)
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*addr_len = sizeof(*sin);
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skb = skb_recv_datagram(sk, flags, noblock, &err);
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if (!skb)
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goto out;
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@ -543,6 +540,7 @@ static int l2tp_ip_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *m
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sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
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sin->sin_port = 0;
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memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
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*addr_len = sizeof(*sin);
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}
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if (inet->cmsg_flags)
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ip_cmsg_recv(msg, skb);
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@ -139,9 +139,6 @@ static int pn_recvmsg(struct kiocb *iocb, struct sock *sk,
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MSG_CMSG_COMPAT))
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goto out_nofree;
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if (addr_len)
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*addr_len = sizeof(sa);
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skb = skb_recv_datagram(sk, flags, noblock, &rval);
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if (skb == NULL)
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goto out_nofree;
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@ -162,8 +159,10 @@ static int pn_recvmsg(struct kiocb *iocb, struct sock *sk,
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rval = (flags & MSG_TRUNC) ? skb->len : copylen;
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if (msg->msg_name != NULL)
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memcpy(msg->msg_name, &sa, sizeof(struct sockaddr_pn));
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if (msg->msg_name != NULL) {
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memcpy(msg->msg_name, &sa, sizeof(sa));
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*addr_len = sizeof(sa);
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}
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out:
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skb_free_datagram(sk, skb);
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