linux-kernel - [PATCH] ipv4: netfilter: ip_tables: fix information leak to userland

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Message-Id: <1288448810-6628-1-git-send-email-segooon@gmail.com>
Date:	Sat, 30 Oct 2010 18:26:50 +0400
From:	Vasiliy Kulikov <segooon@...il.com>
To:	kernel-janitors@...r.kernel.org
Cc:	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ipv4: netfilter: ip_tables: fix information leak to userland

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>
---
 Compile tested.

 net/ipv4/netfilter/ip_tables.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index d31b007..a846d63 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -1124,6 +1124,7 @@ 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));
-- 
1.7.0.4

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