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Message-ID: <lsq.1388282924.732763262@decadent.org.uk>
Date: Sun, 29 Dec 2013 03:08:44 +0100
From: Ben Hutchings <ben@...adent.org.uk>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC: akpm@...ux-foundation.org,
"Hannes Frederic Sowa" <hannes@...essinduktion.org>,
"Eric Dumazet" <eric.dumazet@...il.com>,
"mpb" <mpb.mail@...il.com>, Tom@...adent.org.uk,
"David S. Miller" <davem@...emloft.net>,
"Brad Spengler" <spender@...ecurity.net>
Subject: [PATCH 3.2 161/185] inet: fix addr_len/msg->msg_namelen
assignment in recv_error and rxpmtu functions
3.2.54-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Hannes Frederic Sowa <hannes@...essinduktion.org>
[ 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@...ecurity.net>
Reported-by: Tom Labanowski
Cc: mpb <mpb.mail@...il.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: Eric Dumazet <eric.dumazet@...il.com>
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
include/net/ip.h | 2 +-
include/net/ipv6.h | 6 ++++--
net/ipv4/ip_sockglue.c | 3 ++-
net/ipv4/ping.c | 2 +-
net/ipv4/raw.c | 2 +-
net/ipv4/udp.c | 2 +-
net/ipv6/datagram.c | 7 +++++--
net/ipv6/raw.c | 4 ++--
net/ipv6/udp.c | 4 ++--
9 files changed, 19 insertions(+), 13 deletions(-)
diff --git a/include/net/ip.h b/include/net/ip.h
index 06aed72..b935e6c 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -466,7 +466,7 @@ 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 4d549cf..0580673 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -602,8 +602,10 @@ 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_rxpmtu(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 int ipv6_recv_rxpmtu(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 flowi6 *fl6, u32 info);
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 3b36002..542a9c1 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -374,7 +374,7 @@ 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;
@@ -411,6 +411,7 @@ 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/ping.c b/net/ipv4/ping.c
index 41fea2d..a1f6b34 100644
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -632,7 +632,7 @@ static int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
goto out;
if (flags & MSG_ERRQUEUE)
- return ip_recv_error(sk, msg, len);
+ return ip_recv_error(sk, msg, len, addr_len);
skb = skb_recv_datagram(sk, flags, noblock, &err);
if (!skb)
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index c676d07..cfded93 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -687,7 +687,7 @@ 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 107ab5c..ccdb85a 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1172,7 +1172,7 @@ int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
bool slow;
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 e248069..144c105 100644
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -315,7 +315,7 @@ void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
/*
* 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;
@@ -366,6 +366,7 @@ int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
&sin->sin6_addr);
}
+ *addr_len = sizeof(*sin);
}
memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
@@ -418,7 +419,8 @@ out:
/*
* Handle IPV6_RECVPATHMTU
*/
-int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len)
+int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
+ int *addr_len)
{
struct ipv6_pinfo *np = inet6_sk(sk);
struct sk_buff *skb;
@@ -452,6 +454,7 @@ int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len)
sin->sin6_port = 0;
sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
ipv6_addr_copy(&sin->sin6_addr, &mtu_info.ip6m_addr.sin6_addr);
+ *addr_len = sizeof(*sin);
}
put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 3278f27..9ecbc84 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -457,10 +457,10 @@ 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);
if (np->rxpmtu && np->rxopt.bits.rxpmtu)
- return ipv6_recv_rxpmtu(sk, msg, len);
+ return ipv6_recv_rxpmtu(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 391329e..f8bec1e 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -348,10 +348,10 @@ int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
bool slow;
if (flags & MSG_ERRQUEUE)
- return ipv6_recv_error(sk, msg, len);
+ return ipv6_recv_error(sk, msg, len, addr_len);
if (np->rxpmtu && np->rxopt.bits.rxpmtu)
- return ipv6_recv_rxpmtu(sk, msg, len);
+ return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
try_again:
skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
--
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