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Message-Id: <20110412143556.428027136@clark.kroah.org>
Date: Tue, 12 Apr 2011 07:35:08 -0700
From: Greg KH <gregkh@...e.de>
To: linux-kernel@...r.kernel.org, stable@...nel.org
Cc: stable-review@...nel.org, torvalds@...ux-foundation.org,
akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
Vasiliy Kulikov <segoon@...nwall.com>,
Patrick McHardy <kaber@...sh.net>
Subject: [079/105] netfilter: ip_tables: fix infoleak to userspace
2.6.38-stable review patch. If anyone has any objections, please let us know.
------------------
From: Vasiliy Kulikov <segoon@...nwall.com>
commit 78b79876761b86653df89c48a7010b5cbd41a84a upstream.
Structures ipt_replace, compat_ipt_replace, and xt_get_revision are
copied from userspace. Fields of these structs that are
zero-terminated strings are not checked. When they are used as argument
to a format string containing "%s" in request_module(), some sensitive
information is leaked to userspace via argument of spawned modprobe
process.
The first and the third bugs were introduced before the git epoch; the
second was introduced in 2722971c (v2.6.17-rc1). To trigger the bug
one should have CAP_NET_ADMIN.
Signed-off-by: Vasiliy Kulikov <segoon@...nwall.com>
Signed-off-by: Patrick McHardy <kaber@...sh.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
net/ipv4/netfilter/ip_tables.c | 3 +++
1 file changed, 3 insertions(+)
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -1261,6 +1261,7 @@ do_replace(struct net *net, const void _
/* overflow check */
if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
return -ENOMEM;
+ tmp.name[sizeof(tmp.name)-1] = 0;
newinfo = xt_alloc_table_info(tmp.size);
if (!newinfo)
@@ -1805,6 +1806,7 @@ compat_do_replace(struct net *net, void
return -ENOMEM;
if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
return -ENOMEM;
+ tmp.name[sizeof(tmp.name)-1] = 0;
newinfo = xt_alloc_table_info(tmp.size);
if (!newinfo)
@@ -2034,6 +2036,7 @@ do_ipt_get_ctl(struct sock *sk, int cmd,
ret = -EFAULT;
break;
}
+ rev.name[sizeof(rev.name)-1] = 0;
if (cmd == IPT_SO_GET_REVISION_TARGET)
target = 1;
--
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