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Message-Id: <20140512003203.916690450@1wt.eu>
Date: Mon, 12 May 2014 02:33:19 +0200
From: Willy Tarreau <w@....eu>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Hannes Frederic Sowa <hannes@...essinduktion.org>,
"David S. Miller" <davem@...emloft.net>, Willy Tarreau <w@....eu>
Subject: [ 079/143] inet: prevent leakage of uninitialized memory to user in recv
2.6.32-longterm review patch. If anyone has any objections, please let me know.
------------------
syscalls
From: Hannes Frederic Sowa <hannes@...essinduktion.org>
[ 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@...il.com>
Suggested-by: Eric Dumazet <eric.dumazet@...il.com>
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
[wt: no ieee802154, ping nor l2tp in 2.6.32]
Signed-off-by: Willy Tarreau <w@....eu>
---
net/ipv4/raw.c | 4 +---
net/ipv4/udp.c | 7 +------
net/ipv6/raw.c | 4 +---
net/ipv6/udp.c | 5 +----
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 07ab583..c50344b 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 af559e0..80487ee 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 4f24570..df75f94 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 d8c0374..ce291af 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 ef5c75c..c88da73 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);
--
1.7.12.2.21.g234cd45.dirty
--
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