3.2-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mathias Krause <mini...@googlemail.com>
[ Upstream commit 9344a972961d1a6d2c04d9008b13617bcb6ec2ef ]
The RFCOMM code fails to initialize the trailing padding byte of struct
sockaddr_rc added for alignment. It that for leaks one byte kernel stack
via the getsockname() syscall. Add an explicit memset(0) before filling
the structure to avoid the info leak.
Signed-off-by: Mathias Krause <mini...@googlemail.com>
Cc: Marcel Holtmann <mar...@holtmann.org>
Cc: Gustavo Padovan <gust...@padovan.org>
Cc: Johan Hedberg <johan.hedb...@gmail.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
net/bluetooth/rfcomm/sock.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index 03584bc..7ee4ead 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -547,6 +547,7 @@ static int rfcomm_sock_getname(struct socket *sock, struct
sockaddr *addr, int *
BT_DBG("sock %p, sk %p", sock, sk);
+ memset(sa, 0, sizeof(*sa));
sa->rc_family = AF_BLUETOOTH;
sa->rc_channel = rfcomm_pi(sk)->channel;
if (peer)
--
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