This is a note to let you know that I've just added the patch titled
pptp: fix stack info leak in pptp_getname()
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pptp-fix-stack-info-leak-in-pptp_getname.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Wed Dec 3 17:06:35 PST 2014
From: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Date: Wed, 19 Nov 2014 18:05:26 +0100
Subject: pptp: fix stack info leak in pptp_getname()
From: Mathias Krause <minipli@xxxxxxxxxxxxxx>
[ Upstream commit a5f6fc28d6e6cc379c6839f21820e62262419584 ]
pptp_getname() only partially initializes the stack variable sa,
particularly only fills the pptp part of the sa_addr union. The code
thereby discloses 16 bytes of kernel stack memory via getsockname().
Fix this by memset(0)'ing the union before.
Cc: Dmitry Kozlov <xeb@xxxxxxx>
Signed-off-by: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ppp/pptp.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/net/ppp/pptp.c
+++ b/drivers/net/ppp/pptp.c
@@ -506,7 +506,9 @@ static int pptp_getname(struct socket *s
int len = sizeof(struct sockaddr_pppox);
struct sockaddr_pppox sp;
- sp.sa_family = AF_PPPOX;
+ memset(&sp.sa_addr, 0, sizeof(sp.sa_addr));
+
+ sp.sa_family = AF_PPPOX;
sp.sa_protocol = PX_PROTO_PPTP;
sp.sa_addr.pptp = pppox_sk(sock->sk)->proto.pptp.src_addr;
Patches currently in stable-queue which might be from minipli@xxxxxxxxxxxxxx are
queue-3.17/pptp-fix-stack-info-leak-in-pptp_getname.patch
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