[PATCH] 8 bytes kernel memory disclosure in AppleTalk getsockname.

[Clement LECIGNE <clement.lecigne@netasq.com>]

Hi,

In function atalk_getname(), sockaddr_at is returned in userland without
zero'ing the "char sat_zero[8]" field. This bug allows user to display 8
bytes leaked from the kernel stack.

Here is a patch that zero the whole sockaddr_at structure before
processing it. It should fix this bug.

Signed-off-by: Clément Lecigne <clement.lecigne@netasq.com>
--- linux/net/appletalk/ddp.c	2009-08-26 11:35:59.000000000 +0200
+++ linux/net/appletalk/ddp.c	2009-08-26 11:36:30.000000000 +0200
@@ -1241,6 +1241,8 @@ static int atalk_getname(struct socket *
 		if (atalk_autobind(sk) < 0)
 			return -ENOBUFS;
 
+	memset(&sat, 0, sizeof(struct sockaddr_at));
+
 	*uaddr_len = sizeof(struct sockaddr_at);
 
 	if (peer) {

-- 
Clément LECIGNE,
-Only one remote hole in the default install, in more than 10 years!<br>
+Only two remote holes in the default install, in more than 10 years!<br>