netdev - Re: [PATCH 5/5] ipv4: netfilter: ip_tables: fix information leak to userland

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Date:	Wed, 3 Nov 2010 23:55:58 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	kaber@...sh.net
cc:	davem@...emloft.net, netfilter-devel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 5/5] ipv4: netfilter: ip_tables: fix information leak to
 userland

On Wednesday 2010-11-03 23:12, kaber@...sh.net wrote:

>From: Vasiliy Kulikov <segooon@...il.com>
>
>Structure ipt_getinfo is copied to userland with the field "name"
>that has the last elements unitialized.  It leads to leaking of
>contents of kernel stack memory.
>
>Signed-off-by: Vasiliy Kulikov <segooon@...il.com>
>Signed-off-by: Patrick McHardy <kaber@...sh.net>
>---
> net/ipv4/netfilter/ip_tables.c |    1 +


But then we would also need this:


--------8<-------------
parent 93aa45607748d2ffa73f41a435dced6a2fd90cb5 (v2.6.36-rc3-1020-g93aa456)
commit 8aff3f67fa47f7d3211aea8bbef999554d6f65e5
Author: Jan Engelhardt <jengelh@...ozas.de>
Date:   Wed Nov 3 23:55:18 2010 +0100

netfilter: ip6_tables: fix information leak to userspace

Signed-off-by: Jan Engelhardt <jengelh@...ozas.de>
---
 net/ipv6/netfilter/ip6_tables.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index c683e9e..d13f893 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -1137,6 +1137,7 @@ static int get_info(struct net *net, void __user *user,
 			private = &tmp;
 		}
 #endif
+		memset(&info, 0, sizeof(info));
 		info.valid_hooks = t->valid_hooks;
 		memcpy(info.hook_entry, private->hook_entry,
 		       sizeof(info.hook_entry));
-- 
# Created with git-export-patch
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