| From | Paul Gortmaker <> | Subject | [v2.6.34-stable 130/213] Bluetooth: RFCOMM - Fix info leak via getsockname() | Date | Wed, 5 Feb 2014 15:01:25 -0500 |
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From: Mathias Krause <minipli@googlemail.com>
------------------- 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 9344a972961d1a6d2c04d9008b13617bcb6ec2ef upstream.
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 <minipli@googlemail.com> Cc: Marcel Holtmann <marcel@holtmann.org> Cc: Gustavo Padovan <gustavo@padovan.org> Cc: Johan Hedberg <johan.hedberg@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> --- 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 b045bbbc2353..92aa7a012110 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) -- 1.8.5.2
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