From: Mathias Krause <minipli@xxxxxxxxxxxxxx>
-------------------
This is a commit scheduled for the next v2.6.34 longterm release.
http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git
If you see a problem with using this for longterm, please comment.
-------------------
commit c77a4b9cffb6215a15196ec499490d116dfad181 upstream.
For stream sockets the code misses to update the msg_namelen member
to 0 and therefore makes net/socket.c leak the local, uninitialized
sockaddr_storage variable to userland -- 128 bytes of kernel stack
memory. The msg_namelen update is also missing for datagram sockets
in case the socket is shutting down during receive.
Fix both issues by setting msg_namelen to 0 early. It will be
updated later if we're going to fill the msg_name member.
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>
---
net/llc/af_llc.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index 06010e1e89f9..121c92e3c128 100644
--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -719,6 +719,8 @@ static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock,
int target; /* Read at least this many bytes */
long timeo;
+ msg->msg_namelen = 0;
+
lock_sock(sk);
copied = -ENOTCONN;
if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN))
--
1.8.5.2
--
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