diff options
| author | Hannes Frederic Sowa <hannes@stressinduktion.org> | 2013-11-18 04:20:45 +0100 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2014-05-19 07:53:59 +0200 |
| commit | f8e4f8fc477a233429d60e7ed4acdc5e09337af9 (patch) | |
| tree | 4d923f70d71af91803333e56f060d8dbb5cb8f1b /net | |
| parent | c091517bfcde5e59ef4f8f1355761dbe2b04c6ff (diff) | |
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>
[wt: no ieee802154, ping nor l2tp in 2.6.32]
Signed-off-by: Willy Tarreau <w@1wt.eu>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/raw.c | 4 | ||||
| -rw-r--r-- | net/ipv4/udp.c | 7 | ||||
| -rw-r--r-- | net/ipv6/raw.c | 4 | ||||
| -rw-r--r-- | net/ipv6/udp.c | 5 | ||||
| -rw-r--r-- | net/phonet/datagram.c | 9 |
5 files changed, 8 insertions, 21 deletions
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c index 07ab583bddb..c50344b5fda 100644 --- a/net/ipv4/raw.c +++ b/net/ipv4/raw.c @@ -681,9 +681,6 @@ 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; @@ -711,6 +708,7 @@ 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 af559e0373d..80487ee8c48 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -941,12 +941,6 @@ int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, int err; int is_udplite = IS_UDPLITE(sk); - /* - * Check any passed addresses - */ - if (addr_len) - *addr_len = sizeof(*sin); - if (flags & MSG_ERRQUEUE) return ip_recv_error(sk, msg, len); @@ -1001,6 +995,7 @@ 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 4f24570b086..df75f9475eb 100644 --- a/net/ipv6/raw.c +++ b/net/ipv6/raw.c @@ -456,9 +456,6 @@ 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); @@ -495,6 +492,7 @@ 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_timestamp(msg, sk, skb); diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index d8c03744007..ce291af0f95 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -200,9 +200,6 @@ int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, int is_udplite = IS_UDPLITE(sk); int is_udp4; - if (addr_len) - *addr_len=sizeof(struct sockaddr_in6); - if (flags & MSG_ERRQUEUE) return ipv6_recv_error(sk, msg, len); @@ -273,7 +270,7 @@ 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/phonet/datagram.c b/net/phonet/datagram.c index ef5c75c372e..c88da7378c6 100644 --- a/net/phonet/datagram.c +++ b/net/phonet/datagram.c @@ -122,9 +122,6 @@ static int pn_recvmsg(struct kiocb *iocb, struct sock *sk, if (flags & MSG_OOB) goto out_nofree; - if (addr_len) - *addr_len = sizeof(sa); - skb = skb_recv_datagram(sk, flags, noblock, &rval); if (skb == NULL) goto out_nofree; @@ -145,8 +142,10 @@ 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); |