linux-kernel - [PATCH 4.14 103/183] netfilter: x_tables: fix pointer leaks to userspace

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Date:   Wed, 25 Apr 2018 12:35:23 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dmitry Vyukov <dvyukov@...gle.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 103/183] netfilter: x_tables: fix pointer leaks to userspace

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dmitry Vyukov <dvyukov@...gle.com>


[ Upstream commit 1e98ffea5a8935ec040ab72299e349cb44b8defd ]

Several netfilter matches and targets put kernel pointers into
info objects, but don't set usersize in descriptors.
This leads to kernel pointer leaks if a match/target is set
and then read back to userspace.

Properly set usersize for these matches/targets.

Found with manual code inspection.

Fixes: ec2318904965 ("xtables: extend matches and targets with .usersize")
Signed-off-by: Dmitry Vyukov <dvyukov@...gle.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/netfilter/xt_IDLETIMER.c |    1 +
 net/netfilter/xt_LED.c       |    1 +
 net/netfilter/xt_limit.c     |    3 +--
 net/netfilter/xt_nfacct.c    |    1 +
 net/netfilter/xt_statistic.c |    1 +
 5 files changed, 5 insertions(+), 2 deletions(-)

--- a/net/netfilter/xt_IDLETIMER.c
+++ b/net/netfilter/xt_IDLETIMER.c
@@ -256,6 +256,7 @@ static struct xt_target idletimer_tg __r
 	.family		= NFPROTO_UNSPEC,
 	.target		= idletimer_tg_target,
 	.targetsize     = sizeof(struct idletimer_tg_info),
+	.usersize	= offsetof(struct idletimer_tg_info, timer),
 	.checkentry	= idletimer_tg_checkentry,
 	.destroy        = idletimer_tg_destroy,
 	.me		= THIS_MODULE,
--- a/net/netfilter/xt_LED.c
+++ b/net/netfilter/xt_LED.c
@@ -198,6 +198,7 @@ static struct xt_target led_tg_reg __rea
 	.family		= NFPROTO_UNSPEC,
 	.target		= led_tg,
 	.targetsize	= sizeof(struct xt_led_info),
+	.usersize	= offsetof(struct xt_led_info, internal_data),
 	.checkentry	= led_tg_check,
 	.destroy	= led_tg_destroy,
 	.me		= THIS_MODULE,
--- a/net/netfilter/xt_limit.c
+++ b/net/netfilter/xt_limit.c
@@ -193,9 +193,8 @@ static struct xt_match limit_mt_reg __re
 	.compatsize       = sizeof(struct compat_xt_rateinfo),
 	.compat_from_user = limit_mt_compat_from_user,
 	.compat_to_user   = limit_mt_compat_to_user,
-#else
-	.usersize         = offsetof(struct xt_rateinfo, prev),
 #endif
+	.usersize         = offsetof(struct xt_rateinfo, prev),
 	.me               = THIS_MODULE,
 };
 
--- a/net/netfilter/xt_nfacct.c
+++ b/net/netfilter/xt_nfacct.c
@@ -62,6 +62,7 @@ static struct xt_match nfacct_mt_reg __r
 	.match      = nfacct_mt,
 	.destroy    = nfacct_mt_destroy,
 	.matchsize  = sizeof(struct xt_nfacct_match_info),
+	.usersize   = offsetof(struct xt_nfacct_match_info, nfacct),
 	.me         = THIS_MODULE,
 };
 
--- a/net/netfilter/xt_statistic.c
+++ b/net/netfilter/xt_statistic.c
@@ -84,6 +84,7 @@ static struct xt_match xt_statistic_mt_r
 	.checkentry = statistic_mt_check,
 	.destroy    = statistic_mt_destroy,
 	.matchsize  = sizeof(struct xt_statistic_info),
+	.usersize   = offsetof(struct xt_statistic_info, master),
 	.me         = THIS_MODULE,
 };