| Date | Tue, 04 Jun 2013 19:24:30 +0200 | From | Willy Tarreau <> | Subject | [ 180/184] llc: Fix missing msg_namelen update in |
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2.6.32-longterm review patch. If anyone has any objections, please let me know.
------------------ llc_ui_recvmsg()
From: Mathias Krause <minipli@googlemail.com>
[ Upstream commit c77a4b9cffb6215a15196ec499490d116dfad181 ]
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.
Signed-off-by: Mathias Krause <minipli@googlemail.com> Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Willy Tarreau <w@1wt.eu> --- 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 606b6ad..8a814a5 100644 --- a/net/llc/af_llc.c +++ b/net/llc/af_llc.c @@ -674,6 +674,8 @@ 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)) -- 1.7.12.2.21.g234cd45.dirty
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