[ 16/34] tipc: fix info leaks via msg_name in recv_msg/recv_stream

From: Greg Kroah-Hartman
Date: Mon Apr 29 2013 - 15:20:44 EST

3.4-stable review patch. If anyone has any objections, please let me know.


From: Mathias Krause <minipli@xxxxxxxxxxxxxx>

[ Upstream commit 60085c3d009b0df252547adb336d1ccca5ce52ec ]

The code in set_orig_addr() does not initialize all of the members of
struct sockaddr_tipc when filling the sockaddr info -- namely the union
is only partly filled. This will make recv_msg() and recv_stream() --
the only users of this function -- leak kernel stack memory as the
msg_name member is a local variable in net/socket.c.

Additionally to that both recv_msg() and recv_stream() fail to update
the msg_namelen member to 0 while otherwise returning with 0, i.e.
"success". This is the case for, e.g., non-blocking sockets. This will
lead to a 128 byte kernel stack leak in net/socket.c.

Fix the first issue by initializing the memory of the union with
memset(0). Fix the second one by setting msg_namelen to 0 early as it
will be updated later if we're going to fill the msg_name member.

Signed-off-by: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Cc: Jon Maloy <jon.maloy@xxxxxxxxxxxx>
Cc: Allan Stephens <allan.stephens@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
net/tipc/socket.c | 7 +++++++
1 file changed, 7 insertions(+)

--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -829,6 +829,7 @@ static void set_orig_addr(struct msghdr
if (addr) {
addr->family = AF_TIPC;
addr->addrtype = TIPC_ADDR_ID;
+ memset(&addr->addr, 0, sizeof(addr->addr));
addr->addr.id.ref = msg_origport(msg);
addr->addr.id.node = msg_orignode(msg);
addr->addr.name.domain = 0; /* could leave uninitialized */
@@ -948,6 +949,9 @@ static int recv_msg(struct kiocb *iocb,
goto exit;

+ /* will be updated in set_orig_addr() if needed */
+ m->msg_namelen = 0;
timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);

@@ -1074,6 +1078,9 @@ static int recv_stream(struct kiocb *ioc
goto exit;

+ /* will be updated in set_orig_addr() if needed */
+ m->msg_namelen = 0;
target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);

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